Glossary

#A B C D E F G H I J K L M N O P R S T U V W Y

.ftacc: File with a copy of a FuelTech module's configuration, exported and imported by CAN Network. (In: CAN Technical Guide 1.2)
.ftcf file: File of a custom function, with blocks, links, user screen and the hash of the editing password, if there is one (never the password text). It is used to export and import. (In: Custom Functions Technical Guide 1.1)
.ftds: Exported dashboard, as JSON text with the images in base64. v1: one target, written by the PC (the PC only opens v1). v2: multiple targets, written by the phone and the tablet. (In: Dashboard Technical Guide 1.0)
1 kHz loop: Nominal repetition, every 1 ms, in which the VCU runs all the blocks in dependency order; each repetition is a cycle. (In: Custom Functions Technical Guide 1.1)
2-step: Rev limiter used at launch. (In: CAN Technical Guide 1.2); Native launch function of the VCU, which FuelTech Vision calls 2-step rev limiter: it limits the RPM before the launch. In ignition, it wins over the custom function. (In: Custom Functions Technical Guide 1.1)
2-Step / 3-Step: VCU rev limiters used at the launch. (In: Dashboard Technical Guide 1.0)
3-step: Native launch function (3-step / boost spool / roll start), to spool the turbo or to launch while rolling. In ignition, it wins over the custom function. (In: Custom Functions Technical Guide 1.1)
Absolute pressure: Pressure counted from total vacuum, used in the air calculation. Without a barometer, the VCU arrives at it by adding a fixed 1.01325 bar to the MAP on screen. (In: VE Technical Guide 1.1)
Acceleration fuel enrichment and decay: Fuel added ahead of time, in % of the base fuel, by the speed of the TPS or the Pedal: positive when the throttle opens, negative (decay) when it closes. It is off by default; with the default settings, any trigger freezes the fast correction and stops the learning. (In: VE Technical Guide 1.1)
ACK: Acknowledgment bit of the CAN frame. Any module that received the frame without error forces this bit to dominant. (In: CAN Technical Guide 1.2)
Activate night mode / Enable: Switch that turns on the night background: Activate night mode on the PC, Enable on the other devices. (In: Dashboard Technical Guide 1.0)
Activation mode: Field of Device (FT700 and Plus), with Activated at 0V and Activated at 12V. It is saved, but does not change the signal: the Input sensor applies. (In: Dashboard Technical Guide 1.0)
AFR: Ratio between air mass and fuel mass. On the screen, it is just another way of showing lambda: lambda × stoichiometric AFR of the fuel configured in the map. (In: VE Technical Guide 1.1)
Aggressive cam: High-overlap camshaft. The idle VE can be well below the load VE without being a map error. (In: VE Technical Guide 1.1)
Alert: Section of the reading gauge: mode, Low alert and High alert, in the map's unit. On the Shift, High alert is the shift point, in RPM. (In: Dashboard Technical Guide 1.0)
Alpha: Weight of the new sample in a filter. Near 0 it filters a lot; near 1 it barely filters. It applies per cycle, not per second. (In: Custom Functions Technical Guide 1.1)
Angular limit: Maximum pulse duration in crankshaft degrees, counting the dead time. The smaller of it and the window width applies. (In: High-Pressure Pump (HPFP) Technical Guide 1.1)
Anti windup: Limit of the value accumulated by the integral part of a PID, upward and downward. It prevents the accumulated value from growing without end. (In: Custom Functions Technical Guide 1.1)
Anti-lag: Native VCU function (in the menu, Anti-Lag / Pops & Bangs / Engine brake) that holds the turbo pressure with the throttle closed. In ignition, it ties with the custom function. (In: Custom Functions Technical Guide 1.1); VCU function that keeps the turbo spooled with the throttle closed. (In: Dashboard Technical Guide 1.0)
Anti-windup: With feed-forward on, the limit of the accumulator of the PID integral term: the maximum integral term is Ki × Anti-windup. Not used without feed-forward. (In: High-Pressure Pump (HPFP) Technical Guide 1.1)
Apply the learned LTFT: Switch, off by default, that makes the LTFT correct the fuel. Off, the table only observes; leave it that way while collecting. (In: VE Technical Guide 1.1)
Apply to VE: Button that writes the residual to the VE of the open map and clears the whole learning in the VCU, without confirmation. It does not send the map to the VCU. (In: VE Technical Guide 1.1)
Arbitration: Contest for the bus when two modules start transmitting together. The lowest ID wins. (In: CAN Technical Guide 1.2)
Arithmetic channel: Signal field in Customizable CAN. When on, the VCU does the calculation with real numbers and accepts a fractional scale and a negative offset. (In: CAN Technical Guide 1.2)
Authority: How much the correction can move: Fast correction (STFT) limits by MAP for the fast correction and Total authority (STFT + LTFT), 25% by default, for the two together. (In: VE Technical Guide 1.1)
Bank: Group of injectors commanded together. The VCU has banks A, B and C (Primaries, Secondaries and Tertiaries on the screen), each with its own actions in the VCU action block. (In: Custom Functions Technical Guide 1.1); Group of injectors (A, B or C). Each rail marks the banks it feeds. (In: High-Pressure Pump (HPFP) Technical Guide 1.1); Group of injectors (A, B or C) with their own flow rate and rated pressure, on the same VE. What A does not deliver up to the Primary injector opening to bring in the next bank passes to the next one. (In: VE Technical Guide 1.1)
Base fuel: Fuel that comes out of the VE model, before the enrichments. Acceleration fuel enrichment is given as a % of it. (In: VE Technical Guide 1.1)
Base map wizard: The Step-by-step map wizard with the Volumetric Efficiency (VE) strategy: generates a VE from scratch, between 30% and 115%, without reading the existing map. It leaves the linearization at zero. (In: VE Technical Guide 1.1)
base unit: Unit in which the map and the .ftds store scale, alert and limits (km/h, °C, bar, lambda). When you change the unit, enter Minimum and Maximum again. (In: Dashboard Technical Guide 1.0)
base64: A way of writing an image as text, to fit in the map and in the .ftds. It takes up about 4/3 of the file size. (In: Dashboard Technical Guide 1.0)
Baud rate (Baudrate): Bit rate, in bits per second (kbit/s or Mbit/s; the CAN ports screen writes kbps). All modules on a bus must use the same one. (In: CAN Technical Guide 1.2)
Bit stuffing: Bits inserted into the stream: after five identical bits in a row, the transmitter inserts an inverted bit. (In: CAN Technical Guide 1.2)
Block: Each piece of a custom function, with inputs, output and parameters. (In: Custom Functions Technical Guide 1.1)
bracket: Drag racing format in which each driver dials in the elapsed time they expect to run (the dial-in). The Time selector edits these times (section 6.5). (In: Dashboard Technical Guide 1.0)
BRS: Bit Rate Switch. In CAN FD, switches to the data rate during the data phase of the frame. (In: CAN Technical Guide 1.2)
BSFC: Brake specific fuel consumption (lb/hp·h). In VE mode it only serves to estimate power and torque in the log. (In: VE Technical Guide 1.1)
Burnout: Native launch function used in the burnout, the heating of the tires before the launch. In ignition, it wins over the custom function. (In: Custom Functions Technical Guide 1.1); Function to heat the tires before the launch. (In: Dashboard Technical Guide 1.0)
Bus: The pair of wires CAN_H and CAN_L to which all the modules of the network are connected. (In: CAN Technical Guide 1.2)
Bus-off: State in which a module, after many errors, disconnects from the bus so it does not disturb the others. (In: CAN Technical Guide 1.2)
Calibration (of the MAP sensor): Value added across the whole range of the internal MAP sensor, which changes the air calculation in every cell. It is not a zero button: leave it at 0. (In: VE Technical Guide 1.1)
Cam dependence: Makes the pump window follow the VVT deviation of the chosen cam. A retarded cam shifts the window later. (In: High-Pressure Pump (HPFP) Technical Guide 1.1)
Camshaft degree: Degree measured on the cam, which turns at half the crankshaft speed. One camshaft degree equals 2 crankshaft degrees. (In: High-Pressure Pump (HPFP) Technical Guide 1.1)
CAN: Controller Area Network. Serial communication network used in vehicles (ISO 11898). (In: CAN Technical Guide 1.2); Communication network (CAN bus) between the vehicle's modules. A channel that arrives over the CAN bus can overwrite the value the function writes to it. (In: Custom Functions Technical Guide 1.1)
CAN / FTCAN2.0: CAN (the CAN bus) is the data network between the car's modules; FTCAN2.0 is FuelTech's CAN protocol. Both are possible signal sources for an input. (In: Dashboard Technical Guide 1.0)
CAN FD: Evolution of CAN with up to 64 bytes per frame and a faster data phase. (In: CAN Technical Guide 1.2)
CAN_H and CAN_L: The two wires of the bus. The information is in the voltage difference between them. (In: CAN Technical Guide 1.2)
Cancel changes: Discards the changes of all targets and clears the undo history. On the PC it asks for confirmation; in the touch editors, it does not. (In: Dashboard Technical Guide 1.0)
canvas: The editor's drawing area, at the target's size. (In: Dashboard Technical Guide 1.0)
Cell: Each point of a table, at an engine speed and a pressure. Near the edge of a cell, the VE used is the blend of the four neighboring cells. (In: VE Technical Guide 1.1)
Channel: Value that the VCU stores and shows on the panel and in the log, such as RPM, MAP or a Custom measurement. (In: Custom Functions Technical Guide 1.1)
Checksum: Check value calculated over the data of the frame. Some original modules require this value in command frames. (In: CAN Technical Guide 1.2)
Chroma key: Video Overlay option that generates the video with a solid color (green, by default) in place of the image, so that another program can cut out that color. (In: Dashboard Technical Guide 1.0)
Clamp and Extrapolation: Modes of tables and vectors outside the range of the axes: Clamp holds the value at the end; Extrapolation continues the line of the end segment. (In: Custom Functions Technical Guide 1.1)
Clear LTFT: Button that zeroes values, hits and temperatures of all the cells and copies the axes of the VE that is in the VCU. Use it after sending the new map. (In: VE Technical Guide 1.1)
Closed loop: Automatic correction of the injection from the O2 sensor reading, to reach the mixture target. (In: Custom Functions Technical Guide 1.1)
Closed loop (Fuel closed loop (VE)): Fuel correction by the O2 sensor: it compares the O2 sensor with the lambda target and corrects the VE used by a factor, without changing the table. It is off in a new map. (In: VE Technical Guide 1.1)
Closed Loop / VE Probe: The lambda that the loop reads: average of the sensors marked in Sensor selection for average value, with valid readings from 0.2 up. (In: VE Technical Guide 1.1)
Closing: Lobe #1 closing angle: end of the pulse, near the lobe peak, not at the peak. By sweep, the value ends up a few crankshaft degrees before it. (In: High-Pressure Pump (HPFP) Technical Guide 1.1)
Color / Gradient: Color selector: Default, Solid and Gradient (Linear, Radial, Axis), with up to 4 colors. (In: Dashboard Technical Guide 1.0)
Commanded pulse: Duration of the valve pulse, in ms, after all the ceilings. It is what is compared between maps. (In: High-Pressure Pump (HPFP) Technical Guide 1.1)
Commit (Commit to VE): Page that takes the residual to the VE of the open map: new VE = current VE × (1 + residual × Percentage to apply), 50% by default. The Preview shows beforehand what changes. (In: VE Technical Guide 1.1)
Conditional visibility: Turns the gauge on by a measurement (Data), in 5 modes (section 17.5). It is not Visibility, which has the Show title and Show value checkboxes. (In: Dashboard Technical Guide 1.0)
Conditions (gates): List on the VE learning (LTFT) screen: green is free, red freezes or zeroes the correction, yellow only blocks the learning. (In: VE Technical Guide 1.1)
Configuration memory: Space of 2048 bytes, for the whole map, where the type, the connections and the parameters of the blocks are kept. It appears as Settings. (In: Custom Functions Technical Guide 1.1)
Consumption: Average of the injection time, with dead time and corrections, of the marked banks. It is the basis of the feed-forward. (In: High-Pressure Pump (HPFP) Technical Guide 1.1)
Control valve: Pump valve that the VCU turns on and off, once per lobe, to decide when the pump delivers. The VCU does not control the current. (In: High-Pressure Pump (HPFP) Technical Guide 1.1)
Crank index position: Adjustment of the RPM signal: the tooth over the sensor with cylinder 1 at TDC. If wrong, all the pump angles come out shifted. (In: High-Pressure Pump (HPFP) Technical Guide 1.1)
Crankshaft degree: Degree measured on the crankshaft: 720 per 4-stroke cycle, from the TDC of cylinder 1. The pump angles use this unit. (In: High-Pressure Pump (HPFP) Technical Guide 1.1)
CRC: Check code calculated over the CAN frame. The receiver recalculates it and compares. (In: CAN Technical Guide 1.2)
Custom function: Program built with blocks and links that runs inside the VCU. The map has 10 slots for them. (In: Custom Functions Technical Guide 1.1)
Custom measurement: Free input channel of the VCU (#01 to #36), which can receive, for example, a value from an RX CAN frame. It can be renamed. (In: CAN Technical Guide 1.2); One of the 36 channels (#01 to #36) that a function writes with Value for VCU. The user can rename the channel. (In: Custom Functions Technical Guide 1.1)
Cutoff frequency: Frequency, in Hz, that sets the Low pass filter: the lower it is, the more the filter smooths and the slower the output follows the input. (In: Custom Functions Technical Guide 1.1)
Cycle (iteration): Each run of the VCU through all the blocks of all the enabled functions. It happens every 1 ms (1 kHz), a nominal value that depends on the processor load. (In: Custom Functions Technical Guide 1.1)
dashboard: What the VCU shows: up to 4 screens per target, stored in the map. The screen says dashboard. (In: Dashboard Technical Guide 1.0)
Dashboard setup: Opens the editor: 6th item of Interface Settings on the PC and 5th on the other devices (on the FT700, the Plus and the tablet the group is Interface). F3 opens it on the PC. (In: Dashboard Technical Guide 1.0)
DashG2: Internal name of the dashboard, seen on buttons in the Video Overlay Composer. (In: Dashboard Technical Guide 1.0)
Data source: Measurement selector (about 1,180). When you change it, Reload data?: Yes rewrites the minimum, maximum and decimals with those of the new measurement; No keeps the old ones. (In: Dashboard Technical Guide 1.0)
Datalogger: VCU log recorder. Each channel must be enabled in it to appear in the log (Datalogger settings screen). (In: Custom Functions Technical Guide 1.1)
DataSourceId / GaugeType: Fields of the .ftds file: the measurement number (Number column of section 9.2) and the gauge type (0 to 32). (In: Dashboard Technical Guide 1.0)
Day background / Night background: Background of each screen, on the Screen tab. On the PC the labels are Day mode background and Night mode background. (In: Dashboard Technical Guide 1.0)
Day/night mode: VCU function: fixed day or night, dashboard button, external switch or schedule (default: night at 18:00, day at 6:00). (In: Dashboard Technical Guide 1.0)
DBC: Text file that describes the messages and signals of a CAN network. (In: CAN Technical Guide 1.2)
Deactivated / Intra / Extra / Above / Below: Alert modes: no alert; within the range; outside it; equal to or greater than the high one; equal to or less than the low one. (In: Dashboard Technical Guide 1.0)
Dead band: Error below which the loop does not correct, so as not to chase the noise of the O2 sensor: 0.7% by default (0.007 in Lambda error dead band). (In: VE Technical Guide 1.1)
Dead time: See dead time (t0). (In: High-Pressure Pump (HPFP) Technical Guide 1.1)
Dead time (t0): Part of the pulse that does not deliver volume: t0 plus the curve by battery voltage. It only enters when there is demand. (In: High-Pressure Pump (HPFP) Technical Guide 1.1)
Deadband: Band around a value in which the output is 0. Outside it, the Deadband block delivers the input minus the limit. (In: Custom Functions Technical Guide 1.1)
Deadtime: Delay for the injector to open and close. In VE mode, the full value from the table is added to each pulse, according to the battery voltage and the differential pressure. (In: VE Technical Guide 1.1)
Deadtime fraction: Part of the pulse that is deadtime: Primary injectors deadtime ÷ Injection time A. Above 35%, as a starting point, do not correct the VE by the O2 sensor. (In: VE Technical Guide 1.1)
Deceleration cut: With injector consumption below 0.3 ms and pressure 10 bar above the target, the VCU zeroes the pump pulse. Only with feed-forward. (In: High-Pressure Pump (HPFP) Technical Guide 1.1)
Derivative: Change of a signal per second. The Derivative block divides the difference between two cycles by the time between them. (In: Custom Functions Technical Guide 1.1)
Device: Tab and list on the PC that choose the target. On the phone and tablet: Select target. (In: Dashboard Technical Guide 1.0)
DI1 and DI2: Pressure sensor inputs of Rail #1 and Rail #2 (DI: direct injection). The channels DI Rail pressure #1 and DI Rail pressure #2 show the direct reading. (In: High-Pressure Pump (HPFP) Technical Guide 1.1)
Diagnostic: Page that checks whether the learned error really is the VE's, with four tests: global error, deadtime, charge temperature and error only at idle. (In: VE Technical Guide 1.1)
Differential pressure: Fuel pressure in the line minus the pressure in the manifold. The flow rate of the injector grows with its square root; it corrects the useful time and chooses the deadtime row. (In: VE Technical Guide 1.1)
Direct injection (DI): Injector in the cylinder, fed by a high-pressure rail. In VE, the rail pressure enters through the Differential fuel pressure deviation compensation, in the DI Fuel pressure 1 or DI 2 mode. (In: VE Technical Guide 1.1)
Displacement: Total volume of the engine, entered in Engine volume (cc, CI or L). The calculation uses the volume of one cylinder: displacement ÷ Number of cylinders. (In: VE Technical Guide 1.1)
Dither: Small, fast oscillation added to the command of an output. In the solenoid current example, a square wave of +5% and −5% added to the duty. (In: Custom Functions Technical Guide 1.1)
Divisions / Divider: Divisions + 1 major marks. The divider only divides the labels: 8000 by 1000 gives 8. (In: Dashboard Technical Guide 1.0)
DLC: Data Length Code. Field of the frame that gives the number of data bytes. (In: CAN Technical Guide 1.2)
Do not import: Destination in the import window: the file's screen is not brought in. Screens beyond the fourth, or beyond the target's Number of screens, are not brought in, without warning. (In: Dashboard Technical Guide 1.0)
Dominant and recessive: The two states of the bus. Dominant (0) always wins over recessive (1). (In: CAN Technical Guide 1.2)
Duty: Fraction of the time a PWM output stays on, from 0 to 100%. (In: Custom Functions Technical Guide 1.1); Commanded pulse divided by the window width, in %. It is 100 in the start routine and 0 with the rail off. (In: High-Pressure Pump (HPFP) Technical Guide 1.1)
Easing: Speed curve of the entrance animation: it says how the movement speeds up and slows down. Default OutCubic. (In: Dashboard Technical Guide 1.0)
ECU Button: Touch gauge that commands a VCU function, chosen in VCU Command (59 commands). The new button starts with Engine Start/Stop button: change it, because touching it commands the engine start. (In: Dashboard Technical Guide 1.0)
Effective VE: VE used in the calculation: table VE × VE factor. In the log: VE - Effective efficiency %. (In: VE Technical Guide 1.1)
Effective window: Start and end of the real pulse, in the channels GDI - Rail 1 window: effective opening and GDI - Rail 1 window: effective closing. The effective opening is the start of the pulse, not the typed angle. (In: High-Pressure Pump (HPFP) Technical Guide 1.1)
Electric gauge: Power gauge in both directions, traction and regeneration, for an electric vehicle (section 6.5). (In: Dashboard Technical Guide 1.0)
Engine temperature compensation: The warm-up: percentage on the useful time by engine temperature, the same table as in pulsewidth mode. With the loop on, zero it from the minimum temperature of the loop up. (In: VE Technical Guide 1.1)
Enrichment: Percentage added to the useful time: warm-up, post-start, acceleration fuel enrichment, gear and external actions. The percentages add up, they are not multiplied, and they do not move the lambda target. (In: VE Technical Guide 1.1)
Entrance animation: 18 effects plus None; plays once, when loading finishes. (In: Dashboard Technical Guide 1.0)
ETC: Electronic throttle control (drive-by-wire): the throttle plate moved by an electric motor and commanded by the VCU. (In: Custom Functions Technical Guide 1.1)
EV: Electric vehicle. The VCU action block has two actions on the electric motor's torque target. (In: Custom Functions Technical Guide 1.1)
EV mode: Option on the CAN ports screen, RAW mode only. In version 3.0, it does not change how the port works. (In: CAN Technical Guide 1.2)
Exhaust transport constant: Part of the delay that says where the O2 sensor is, divided by the fuel flow rate. Default 0.020 s·l/min; increase it for an O2 sensor far from the manifold. (In: VE Technical Guide 1.1)
Export dashboard to .ftds file / Import dashboard from .ftds file: PC icons. Export saves the checked screens of the active target as a v1 .ftds. Import replaces the chosen destination screens entirely, which are already in the open map, without checking target or resolution, and clears the undo history. (In: Dashboard Technical Guide 1.0)
Extended: Name of the Extended ID field (29-bit ID). In the sniffer, it is also the name of the full-list display mode. (In: CAN Technical Guide 1.2)
Factor and offset: Constants that convert the raw value into the physical value: physical = raw × factor + offset. (In: CAN Technical Guide 1.2)
Failsafe: Value that the VCU uses in place of a sensor when the Use ... sensor switch is off or the sensor is in failure. (In: VE Technical Guide 1.1)
Feed-forward: Physical model that calculates the pulse from the injector consumption. With it on, the PID becomes just a correction, the trim. (In: High-Pressure Pump (HPFP) Technical Guide 1.1)
Feedback loop: Path of links that goes back to an earlier block. The editor accepts it, but the VCU does not run those blocks or the ones that depend on them. (In: Custom Functions Technical Guide 1.1)
Feedforward: Part of the command calculated directly from the target, without waiting for the error to appear. In the solenoid current example, it is the duty the target would require by itself. (In: Custom Functions Technical Guide 1.1)
FFmpeg / PATH: FFmpeg: free video programs that Video Overlay uses to generate the MP4. PATH: list of folders in which Windows looks for programs. (In: Dashboard Technical Guide 1.0)
Fill / Centralize / Free: Positioning of the background image: stretches to the whole screen; centers; or goes to the Offset X and Y position. Scale (%), from 1 to 1000, only applies in Centralize and Free. (In: Dashboard Technical Guide 1.0)
Fill factor: Curve by rpm (Fill factor (RPM)) that enters as a factor in the calculation of W, before the G(W) curve. With 1.00 there is no effect. (In: High-Pressure Pump (HPFP) Technical Guide 1.1)
Filter: Block that smooths a signal. There are EMA filter (exponential moving average), Average filter and Low pass filter. (In: Custom Functions Technical Guide 1.1)
Filtered pressure: Reading of the rail sensor filtered at the stroke frequency, used by the loop. It is not in the log: filtered = target − error. (In: High-Pressure Pump (HPFP) Technical Guide 1.1)
Firmware: Program that runs inside the VCU. An older firmware may not recognize a block of the map. (In: Custom Functions Technical Guide 1.1); The VCU's internal program. This guide covers firmware 00.03.00.54. (In: Dashboard Technical Guide 1.0)
Flex Fuel: Use of fuel with variable ethanol content, measured by a sensor. The Ethanol override (Flex Fuel) action replaces the sensor's ethanol %. (In: Custom Functions Technical Guide 1.1); Function that, with the ethanol sensor, makes the VCU use the stoichiometric AFR of the measured mixture, between pure gasoline (14.7) and anhydrous ethanol (9.0). With it active, work in lambda. (In: VE Technical Guide 1.1)
Flex IO: FT470 pin that can be an output or an input. The pump pin stays as an output. (In: High-Pressure Pump (HPFP) Technical Guide 1.1); FT470 pin that works as an input or as an output, never both. There are 20: 8 blue (injection outputs), 8 gray (ignition) and 4 yellow. (In: VE Technical Guide 1.1)
Flow rate of each primary injector: Flow rate of one injector, not of the bank, at the rated pressure. The VCU uses the flow rate in mass; in cc/min, FuelTech Vision converts it by the density of the chosen fuel. (In: VE Technical Guide 1.1)
Force classic CAN: Frame option, on a port with FD mode, that sends it as classic CAN. (In: CAN Technical Guide 1.2)
Frame: A complete CAN message, with ID, control, data, check and acknowledgment. (In: CAN Technical Guide 1.2); Each image of a GIF. The screen says frames. (In: Dashboard Technical Guide 1.0)
Freeze: The correction stops correcting and keeps only the integral part. If the engine moves one cell, it slides to the value of the new point, with a time constant of 1 s. (In: VE Technical Guide 1.1)
FT700 / FT700 Plus / FT470: VCU with a 7" display, with a 12.3" display and with no display. The FT470's dashboard appears on the PC, phone or tablet; in 3.00.54 the editor opens on Media Device: edit Tablet, Mobile or Desktop. (In: Dashboard Technical Guide 1.0)
FTCAN 2.0: FuelTech's protocol over CAN, with a 29-bit extended ID at 1 Mbit/s, used among FuelTech products. (In: CAN Technical Guide 1.2)
Fuel cut: Injection cut, cut on deceleration (Deceleration fuel cut-off) or on a gear change. It freezes the correction, which comes back at least 2.0 s after the end of the cut. (In: VE Technical Guide 1.1)
Fuel strategy: Field of Engine settings: Injector Pulsewidth (table in ms) or VE Based (table in VE; the VCU calculates the ms). Switching does not convert the map. (In: VE Technical Guide 1.1)
FuelTech Vision: FuelTech software that configures the VCU. The custom function editor is in the desktop version. (In: Custom Functions Technical Guide 1.1); The software on the PC, phone, tablet and the units. VisionFT is the VCU line, not the name of the software. (In: Dashboard Technical Guide 1.0); Computer program in which you edit the map and write it to the VCU; it also opens the log and the learning screen. (In: VE Technical Guide 1.1)
Full scale: The highest pressure the VCU can see: the last point of the sensor table. Only a guard set below it acts (except Guard 2 through the condition target plus 20 bar, with the release below full scale), and a target above it is never seen as reached. (In: High-Pressure Pump (HPFP) Technical Guide 1.1)
G(W): Capture curve: returns the crankshaft degrees of useful pulse needed to deliver the demand W. (In: High-Pressure Pump (HPFP) Technical Guide 1.1)
Gain: Number that multiplies a signal. In the PID, P gain, I gain and D gain are inputs of the block. (In: Custom Functions Technical Guide 1.1)
gauge: Each element of the dashboard. The screen says gauge. (In: Dashboard Technical Guide 1.0)
Gauge pressure: Pressure relative to the atmosphere: negative is vacuum, positive is boost pressure. It is how the MAP appears on the screen and on the axes of the VE tables, including in kPa. (In: VE Technical Guide 1.1)
GDI: Direct injection: the fuel is injected inside the cylinder. The acceleration enrichment example does not suit GDI. (In: Custom Functions Technical Guide 1.1); Direct injection (gasoline direct injection). The direct injection injectors are fed by the high pressure rail. (In: High-Pressure Pump (HPFP) Technical Guide 1.1)
GenMsgCycleTime: DBC attribute with the transmit period of a message, in milliseconds. (In: CAN Technical Guide 1.2)
GIF: Frame-by-frame animation. It runs on its own or follows a measurement, in Position or Speed (section 17.3). (In: Dashboard Technical Guide 1.0)
Graph: The complete drawing of a function: all the blocks and links. (In: Custom Functions Technical Guide 1.1)
Grid: Set of points of the axes of a table. Recommended: up to 16 × 16 on the VE, because of the learning, and 10 × 10 on the target, with axes of equal step. (In: VE Technical Guide 1.1)
Group / Ungroup: Gathers gauges into a Group (Ctrl+G; Ctrl+U undoes it, on the PC). Grouping resets the Entrance animation of each item. Pointers inside the Group do not rotate by value. (In: Dashboard Technical Guide 1.0)
Guard: Pump overpressure protection: see Guard 1 and Guard 2. (In: High-Pressure Pump (HPFP) Technical Guide 1.1)
Guard 1: Pulse limiter: above the entry level, the pulse is limited to a % of the window width. It exits 3 bar below. (In: High-Pressure Pump (HPFP) Technical Guide 1.1)
Guard 2: Overpressure latch: turns off the rail pump and only releases below the release level. It does not cut the injectors. (In: High-Pressure Pump (HPFP) Technical Guide 1.1)
Half bridge: Type of output that connects the load to positive or to negative (ground). On the FT700, the C pins are half bridge. (In: Custom Functions Technical Guide 1.1)
Hard cut: Native rev limiter of the VCU. The custom function beats it only in the fixed ignition timing that the hard cut can apply; the limiter's cut keeps acting. (In: Custom Functions Technical Guide 1.1)
Hash: Cryptographic digest of the editing password. FuelTech Vision stores the hash, never the password. (In: Custom Functions Technical Guide 1.1)
Heel and toe: Quick throttle blip when downshifting, to match the engine speed. With an electronic throttle commanded by the VCU, the Pedal source of acceleration fuel enrichment does not see it. (In: VE Technical Guide 1.1)
Hide / Show: Hide or show the gauge on the dashboard in use. In the editor, a hidden one appears at 30% opacity. (In: Dashboard Technical Guide 1.0)
High pressure fuel pump (HPFP): Mechanical pump driven by the cam lobes that takes fuel to the direct injection rail. The VCU controls only the pump control valve. (In: High-Pressure Pump (HPFP) Technical Guide 1.1)
Hit: One transfer counted in a cell. It measures the confidence of the cell: it counts transfers, not passes of the engine through it. (In: VE Technical Guide 1.1)
Hysteresis: Gap between the value that turns on and the value that turns off. It prevents the output from oscillating when the signal stays near a limit. (In: Custom Functions Technical Guide 1.1); Band between two limits in which the previous state is kept: the light turns on at 100 °C and only turns off below 95 °C. (In: Dashboard Technical Guide 1.0)
IAT and PW: Acronyms on the Diagnostic page: IAT is the intake air temperature; PW is the injection time. (In: VE Technical Guide 1.1)
ID: Message identifier. It defines the content and the priority. 11 bits (standard) or 29 bits (extended). (In: CAN Technical Guide 1.2)
Ideal gas law: Relation that gives how much air fits in a cylinder: absolute pressure × volume ÷ (air constant × temperature in kelvin). The air constant is 0.0028705 bar·L/(g·K). (In: VE Technical Guide 1.1)
IEEE floating point: Binary format for numbers with decimal places. Customizable CAN does not work with it. (In: CAN Technical Guide 1.2)
Initial screen: Field of Device: screen opened when the dashboard loads. It is not Startup screen selection. (In: Dashboard Technical Guide 1.0)
Injection mode for engine start bank A: Engine start fuel injection table: the cranking uses the Engine start table, in ms. Fuel injection main table: the cranking comes from the VE model, with warm-up, post-start and deadtime. (In: VE Technical Guide 1.1)
Injector: Valve that injects the fuel. The VCU commands how long it stays open. (In: VE Technical Guide 1.1)
Injector duty cycle (opening): Fraction of the cycle in which the injector stays open, in the Injection duty A channel. With a bank at 100%, the loop freezes. (In: VE Technical Guide 1.1)
Injector lockout: At start, the marked banks stay without a pulse until the minimum pressure, the Engine running RPM (disengages lockout) or the timeout. Requires feed-forward and the cut on. (In: High-Pressure Pump (HPFP) Technical Guide 1.1)
Injectors saturated (staging): Condition in the Conditions (gates) list: injector at 100% of the cycle in some bank, not the passage from one bank to another. It freezes the correction. (In: VE Technical Guide 1.1)
Input Expander: FuelTech input module connected over the CAN network. Its DashBtn_Switch channel delivers the same measurement as the physical screen-change button. (In: Dashboard Technical Guide 1.0)
Input for screen swipe: Button on the Device tab (FT700 and Plus) that chooses the input. The Dashboard button measurement is number 240. (In: Dashboard Technical Guide 1.0)
Intake manifold: Duct that carries the air to the intake valves. The pressure and the temperature of the air in it enter the air calculation. (In: VE Technical Guide 1.1)
Integral part: Part of the correction that accumulates the error and carries the correction that stays. By default, the integral time is 3 times the estimated delay (Integral time constant (x delay)). (In: VE Technical Guide 1.1)
Intel and Motorola: The two byte orders of a signal longer than 8 bits: Intel (little-endian, least significant byte first, @1) and Motorola (big-endian, most significant byte first, @0). (In: CAN Technical Guide 1.2)
Interlock: Command of the VCU's gear shift management. (In: Dashboard Technical Guide 1.0)
Interpolation: Calculation of a value between two known points of a table or vector, in a straight line. In tables, on both axes, between four cells (bilinear interpolation). (In: Custom Functions Technical Guide 1.1); Value between the points of the table, in a straight line, from the four neighboring cells. Outside the table there is no extrapolation: the VCU repeats the edge value. (In: VE Technical Guide 1.1)
Inverse calculation: Conversion of the pulsewidth map to VE, cell by cell: finding the VE that gives the same fuel that the pulse of the pulsewidth map gave. (In: VE Technical Guide 1.1)
IP Camera / IP cameras: IP Camera is the video gauge. IP cameras is the VCU function where name, address and trigger are registered; the dashboard does not store the address. Change the equipment's factory password. (In: Dashboard Technical Guide 1.0)
ISO 11898: International standard that defines CAN and CAN FD. (In: CAN Technical Guide 1.2)
Jet ski control: Native function for jet ski engines (direction of travel and speed limit). On the ETC opening limit, the custom function wins over jet ski control. (In: Custom Functions Technical Guide 1.1)
Kick: Short boost added to the pulse when the injector consumption rises fast. It only adds, limited by the Kick upper limit. (In: High-Pressure Pump (HPFP) Technical Guide 1.1)
Kp, Ki and Kd: Proportional, integral and derivative gains of a PID. In the block, they are the P gain, I gain and D gain inputs. (In: Custom Functions Technical Guide 1.1); Proportional, integral and derivative gains of the PID. Kp and Ki are curves by rpm; Kd is a single value. (In: High-Pressure Pump (HPFP) Technical Guide 1.1)
Lambda: Measure of the mixture relative to the stoichiometric one: 1 is stoichiometric, below 1 is rich, above 1 is lean. The VCU always stores and uses the target in lambda. (In: VE Technical Guide 1.1)
lambda / AFR: Measurements of the air-fuel mixture. Lambda 1 is the stoichiometric mixture; below 1, rich. AFR is the air/fuel ratio by mass: lambda times the fuel's stoichiometric AFR (section 9.3). (In: Dashboard Technical Guide 1.0)
Lambda error (O2 sensor vs target): Channel with the relative difference between the O2 sensor and the target of the same instant, in %. Positive means a mixture leaner than the target. (In: VE Technical Guide 1.1)
Lambda target table by MAP: Table of the lambda you ask for at each engine speed and manifold pressure, with its own axes. The enrichments do not shift this target; only flex shifts it. (In: VE Technical Guide 1.1)
Latch: Block that keeps a state until it receives the opposite command. In FuelTech Vision: SR Latch (Set and Reset). (In: Custom Functions Technical Guide 1.1); Lock that keeps Guard 2 active until the pressure drops below the release level or the VCU restarts. Stopping the engine does not release it. (In: High-Pressure Pump (HPFP) Technical Guide 1.1)
Launch, anti-lag (ALS) and pit limit: Launch: 2-step, 3-step and burnout. Anti-lag: keeps the turbo pressure with the throttle closed. Pit limit: limits the speed in the pits. In VE mode, while they act, the loop freezes (state Launch / ALS / pit limit). (In: VE Technical Guide 1.1)
Layers: List of the screen's gauges: the top is in front. Each row has an eye, a padlock, duplicate and a trash can. (In: Dashboard Technical Guide 1.0)
Legacy broadcasts: The 9 fixed-content frames that the VCU can send in the format of the simplified packets of the FuelTech PowerFT line ECUs. (In: CAN Technical Guide 1.2)
Limp-home: Safe mode with the rail sensor declared failed. With feed-forward the pulse comes from the model only, without PID. Without feed-forward the pump turns off. (In: High-Pressure Pump (HPFP) Technical Guide 1.1)
Linearization: Correction in ms for short pulses, in which the injector does not deliver fuel in proportion to the time. Table per bank, with one row per cylinder (Primary injector linearization), which starts at zero. (In: VE Technical Guide 1.1)
Link: Connection between the output of one block and the input of another, drawn as a line in the editor. One output feeds several inputs; one input accepts only one link. (In: Custom Functions Technical Guide 1.1)
Lobe: Cam bump that drives the pump. Each lobe gives one stroke per cycle. (In: High-Pressure Pump (HPFP) Technical Guide 1.1)
Lock: Prevents dragging and moving the gauge. On the PC it cannot be selected by clicking in the work area: use Layers. (In: Dashboard Technical Guide 1.0)
Lockout: See injector lockout. (In: High-Pressure Pump (HPFP) Technical Guide 1.1)
Lockup: Torque converter lock of the automatic transmission. (In: Dashboard Technical Guide 1.0)
Log: Recording of the VCU channels during use. Each log has the map that was active embedded in it. (In: Custom Functions Technical Guide 1.1)
Low rail pressure injector cut-off: Injectors of the marked banks stay without a pulse with the pressure below the limit and come back above the limit + 2 bar. (In: High-Pressure Pump (HPFP) Technical Guide 1.1)
LTFT: Long-term fuel trim, the Long term learning (LTFT): table of up to 16 × 16 in the VCU memory, outside the map, that stores per cell the stable part of the fast correction. (In: VE Technical Guide 1.1)
Main MAP VE table: The VE table: filling of the engine in %, from 0 to 300%, by engine speed and MAP, up to 32 × 32. A single one for the whole engine. (In: VE Technical Guide 1.1)
Manifold-referenced regulator: Fuel pressure regulator that follows the MAP and keeps the differential pressure almost constant. Without a pressure sensor, the calculation is only right with it; a line with fixed pressure needs the sensor. (In: VE Technical Guide 1.1)
MAP: Intake manifold pressure. The FuelTech Vision measures table declares it in bar. (In: Custom Functions Technical Guide 1.1); File (.ftmap) with the VCU settings, including the 10 custom functions. (In: Custom Functions Technical Guide 1.1); Manifold pressure. On the load axis of the target map it is in relative bar; vacuum is negative. (In: High-Pressure Pump (HPFP) Technical Guide 1.1); Pressure in the intake manifold and the sensor that measures it. On the screen it appears as gauge pressure; it is the load axis of the VE tables. (In: VE Technical Guide 1.1)
map (.ftmap): File with the complete VCU configuration: tables, functions and the dashboard. It is what is written to the unit. (In: Dashboard Technical Guide 1.0)
MAP estimated by TPS: Table of the expected manifold pressure, in gauge bar, by engine speed and throttle position. The factory default never goes above 0 bar: it is for a naturally aspirated engine. (In: VE Technical Guide 1.1)
MAP failsafe: Chooses what replaces the MAP with Use MAP sensor off or with the external sensor in failure: MAP estimated by TPS table (default) or Fixed value. (In: VE Technical Guide 1.1)
max Theta: Short name of the Angled window upper limit, used in the channel GDI - Angular upper limit (max Theta) rail 1. (In: High-Pressure Pump (HPFP) Technical Guide 1.1)
measurement: Data that the VCU sends, chosen in Data source. (In: Dashboard Technical Guide 1.0)
Measurement units: On the FT700 and the Plus the dashboard always follows the map's units. On the PC, phone and tablet it follows the map (From map/log, default) or Vision (From Vision). (In: Dashboard Technical Guide 1.0)
Media Device: Reserved target in the Device list: no screen in version 3.00.54 shows it. (In: Dashboard Technical Guide 1.0)
MiB: Mebibyte, 1,048,576 bytes. The map cap, 128 MiB, is about 134 million bytes. (In: Dashboard Technical Guide 1.0)
Minimum / Maximum: Start and end of the scale, in the map's unit. When you choose the data, the app writes the measurement's default range (Tachometer with RPM: up to 32000). (In: Dashboard Technical Guide 1.0)
Minimum confidence (hits): Hits that the cell needs to have to enter the Diagnostic, the Preview and the Commit: 20 by default, from 1 to 200. (In: VE Technical Guide 1.1)
Multiplexed signal: Signal that changes meaning depending on a selector value in the same frame. Customizable CAN does not handle it. (In: CAN Technical Guide 1.2)
NaN and Inf: Invalid results of a calculation: NaN ("not a number") and infinity. The VCU does not check for them or warn about them. (In: Custom Functions Technical Guide 1.1)
Navigation Button: Touch gauge that goes to a screen, chosen in Screen index (section 17.2). (In: Dashboard Technical Guide 1.0)
Number of screens: Field of Device: from 1 to 4 screens (Video Overlay: 1). (In: Dashboard Technical Guide 1.0)
O2 sensor (lambda sensor): Sensor in the exhaust that measures the air-fuel mixture. The lambda target is the desired mixture. (In: Custom Functions Technical Guide 1.1)
Odometer: Total distance measurement, number 1108 (trip: 1109). Number 200 is vacant: old gauges set to it end up with no data. (In: Dashboard Technical Guide 1.0)
OEM: Original factory equipment: equipment or network that came with the vehicle. (In: CAN Technical Guide 1.2)
On-Delay and Off-Delay: Modes of the Delay block: On-Delay delays only the turn-on; Off-Delay, only the turn-off. (In: Custom Functions Technical Guide 1.1)
Only enrich above the set pressure: Switch, off by default, that above the set pressure (0.30 bar gauge by default) zeroes the lower limit of the fast correction: it can only add fuel. (In: VE Technical Guide 1.1)
Opening: Lobe #1 opening angle: the earliest start the pulse can have. Together with the closing, it defines the window width. (In: High-Pressure Pump (HPFP) Technical Guide 1.1)
Overlay: Feature of the log chart (Overlay button) that marks on the VE table the engine speed and the MAP of the instant of the cursor. (In: VE Technical Guide 1.1)
Override: Replacement of the value the native function calculates with the value of the custom function. (In: Custom Functions Technical Guide 1.1)
PDM: Power distribution module. The VCU talks to PDM modules through the PDM CAN function. (In: CAN Technical Guide 1.2)
Phase sensor: Sensor that confirms the phase of the 720 crankshaft degree cycle. The function requires it: without it half of the pulses fall outside the lobes. (In: High-Pressure Pump (HPFP) Technical Guide 1.1)
Phase sweep: Field experience: at a fixed steady state, move opening and closing together (the width does not change), 10 crankshaft degrees per step up to ±20, and keep the step with the smallest pulse in ms. (In: High-Pressure Pump (HPFP) Technical Guide 1.1)
PID: Control that adds three parts of the error: proportional (P), integral (I) and derivative (D). Here the error is Data − Target. (In: Custom Functions Technical Guide 1.1); Controller that corrects the pulse by the pressure error, with the proportional, integral and derivative terms. (In: High-Pressure Pump (HPFP) Technical Guide 1.1)
Pins A, B and C: Output pin types of the FT700: A (injection), B (ignition) and C (half bridge). The electrical characteristics are in the VCU installation manual. (In: Custom Functions Technical Guide 1.1)
Pit limit: Speed limit function in the pit area. The legacy broadcasts carry its state (active or not). (In: CAN Technical Guide 1.2); VCU function that limits speed in the pits. (In: Dashboard Technical Guide 1.0)
Pivot X / Pivot Y: The gauge's pivot, from 0 to 1 of the width and the height; default 0.5, the center. (In: Dashboard Technical Guide 1.0)
Plot edge / Plot background: Border and background of the pointer's box. They rotate with the needle and come off by default. (In: Dashboard Technical Guide 1.0)
PNG / JPEG / SVG: PNG: image with transparency. JPEG: no transparency; the image background is always saved as JPEG with quality 85, on a scale up to 100. SVG: vector drawing in XML text. (In: Dashboard Technical Guide 1.0)
Pointer PNG / SVG Pointer: They rotate and change size according to a measurement. In the touch editors they are inside Primitives. (In: Dashboard Technical Guide 1.0)
Post start enrichment: The post-start: percentage by engine temperature and time since the start, up to the last time of the table (8 s by default). During it, the loop stays paused. (In: VE Technical Guide 1.1)
PowerFT: FuelTech ECU line whose simplified packets the legacy broadcasts reproduce. (In: CAN Technical Guide 1.2); Another line of FuelTech ECUs. FuelTech Vision imports its map with the default dashboard (section 1.4). (In: Dashboard Technical Guide 1.0)
Pressure error: Target minus the filtered pressure. Positive: the rail is below the target. (In: High-Pressure Pump (HPFP) Technical Guide 1.1)
Pressurization (gain): Adds time to the pulse when the target rises and removes it when it falls, limited to ±1.5 ms. (In: High-Pressure Pump (HPFP) Technical Guide 1.1)
Primary injector rated pressure: Pressure at which the rated flow rate holds; the two form a pair. Enter the pair at the working differential pressure: the rated pressure is also the center of the learning window. (In: VE Technical Guide 1.1)
Primary injectors deadtime: Deadtime table, 8 × 8, in ms: battery voltage in the columns and differential pressure in the rows. The value used appears in the Primary injectors deadtime channel. (In: VE Technical Guide 1.1)
Primary mode: Multipoint, Semi-sequential (default) or Sequential. In Multipoint, on a piston engine, the bank fires twice per cycle: half of the useful time and the full deadtime in each pulse. (In: VE Technical Guide 1.1)
Pro-Nitrous: Nitrous function of the VCU that adds fuel in milliseconds per bank and per cylinder. In VE mode this fuel is not applied and the mixture goes lean when the nitrous is activated. (In: VE Technical Guide 1.1)
ProductID, DataFieldID and MessageID: The three parts of the FTCAN 2.0 29-bit ID: product and unit, data format and message type. (In: CAN Technical Guide 1.2)
Pullup: Resistor that holds the input at a defined level while the button is released. The with Pullup options of the Input sensor turn it on. (In: Dashboard Technical Guide 1.0)
Pulse (pulse width): Total injector command time: useful time × (1 + enrichments + cylinder trim), plus linearization and deadtime. (In: VE Technical Guide 1.1)
Pump stroke: Each pump delivery, one per lobe. The frequency is rpm × lobes ÷ 120 strokes per second. (In: High-Pressure Pump (HPFP) Technical Guide 1.1)
Push to Pass (P2P): Native function triggered by the push to pass button, with its own counter. On the ETC opening limit, it wins over the custom function. (In: Custom Functions Technical Guide 1.1)
PWM: Signal that switches on and off many times per second. The Duty sets how long it stays on. (In: Custom Functions Technical Guide 1.1)
Racelink: Third-party equipment with its own function in the VCU settings > Racelink menu. (In: CAN Technical Guide 1.2)
Rail: The fuel rail: the high pressure line that feeds the direct injection injectors. The function accepts 1 or 2 rails, each with an output and a sensor. (In: High-Pressure Pump (HPFP) Technical Guide 1.1)
Rail off: The VCU stops commanding the rail valve: invalid width, no sync, no RPM, Guard 2 or, without feed-forward, sensor fault. In the log, the effective window stays at 0/0. (In: High-Pressure Pump (HPFP) Technical Guide 1.1)
RAW mode: CAN port mode without the FuelTech protocol, for third-party equipment and the vehicle's original network. (In: CAN Technical Guide 1.2)
Reference deadtime: Deadtime built into the pulse of the table in pulsewidth mode (Reference deadtime for primaries injectors). It does not exist in VE mode; subtract it in the inverse calculation. (In: VE Technical Guide 1.1)
Required VE: VE that would make the model match the engine at that instant: effective VE × O2 sensor ÷ target × (1 + enrichment ÷ 100). Build it as a calculated channel in the log viewer. (In: VE Technical Guide 1.1)
Residual: LTFT minus the components that the Diagnostic explained, with Remove the explained components from the residual on. It is what the Commit takes to the VE. (In: VE Technical Guide 1.1)
Rising edge: Instant when a signal goes from 0 (or less) to a value greater than 0. The Counter counts these edges. (In: Custom Functions Technical Guide 1.1)
Rolling counter: Value that changes with every frame. Some original modules require it in command frames. (In: CAN Technical Guide 1.2)
Rotation: Rotates the gauge around the pivot. The field accepts -360 to 360 degrees. (In: Dashboard Technical Guide 1.0)
RTSP: Video protocol used by IP cameras. (In: Dashboard Technical Guide 1.0)
Safe mode: One of the reactions the VCU can take on an alert, chosen in Alert action, in the Alerts menu. (In: CAN Technical Guide 1.2)
Sample and Hold: Block that stores the value of a signal at the instant of a trigger and holds it at the output until the next trigger. (In: Custom Functions Technical Guide 1.1)
Sample point: Instant, within each bit, when the controller reads the bus, given as a percentage of the bit duration. (In: CAN Technical Guide 1.2)
Save changes: Check icon. On the FT700 and the Plus it writes the map at once; on the PC, phone and tablet it only marks the map as changed. (In: Dashboard Technical Guide 1.0)
Scale: Multiplier of the gauge size, default 1.0. The PC field accepts 0.01 to 1000. (In: Dashboard Technical Guide 1.0)
Screen: Page of the dashboard, from Screen 1 to Screen 4. The Screen tab edits title and backgrounds. (In: Dashboard Technical Guide 1.0)
Segmented overwrite: Write mode that rewrites the active map on the VCU, keeping its name (section 13.1). (In: Dashboard Technical Guide 1.0)
Shader: Graphic effect of the animated background, recalculated on every frame, with 14 options (section 5.1). (In: Dashboard Technical Guide 1.0)
Shift: Gear shift light: lights up at the High alert (RPM); with it at 0, it stays lit. (In: Dashboard Technical Guide 1.0)
SIG_VALTYPE_: DBC line that marks a signal as floating point. (In: CAN Technical Guide 1.2)
Signal: A value within the frame (engine speed, temperature, switch...), defined by position, size, order, factor and offset. (In: CAN Technical Guide 1.2)
Signal source / Switchpanel: How the button reaches the VCU: White input, CAN, FTCAN2.0 or Switchpanel, the switch panel. In firmware 00.03.00.54 the dashboard button is not among the switch panel's measurements: prefer White input. (In: Dashboard Technical Guide 1.0)
Single identifiers: Screen in the My VCU menu with the map's list of devices. Writing from a device not on the list shows Attention!, and continuing may revoke its access to the VCU (section 13.1). (In: Dashboard Technical Guide 1.0)
Slot seq: Counter at the bottom of the VE learning (LTFT) screen that goes up each time the learning is saved in the VCU memory. (In: VE Technical Guide 1.1)
Snap to grid / Snap to Objects: Snapping to the grid and to the edges and centers of the other gauges, in the Setup snap menu (section 4.2). (In: Dashboard Technical Guide 1.0)
Sniffer: Tool that shows the frames passing on the bus. (In: CAN Technical Guide 1.2)
Socket: Connection point of a block: inputs on the left and outputs on the right. Links connect sockets. (In: Custom Functions Technical Guide 1.1)
SOF, RTR, IDE, SRR, EOF: Control fields of the CAN frame: start of frame, bits that say the type of ID and of frame, and end of frame. (In: CAN Technical Guide 1.2)
Speed-density: Name of the calculation by VE: the fuel comes from the air mass calculated from the manifold pressure and temperature and from the displacement. (In: VE Technical Guide 1.1)
Start bit: Position of the signal within the frame. In Intel it is the least significant bit of the signal; in Motorola, the most significant. In Customizable CAN, the Start bit field. (In: CAN Technical Guide 1.2)
Start routine: With feed-forward, between 50 rpm and the Crank out RPM the valve is held on (duty 100), at most until the timeout. (In: High-Pressure Pump (HPFP) Technical Guide 1.1)
Startup screen selection: Unit function: where it opens at power-on (dashboard, main menu or favorites). It is not Initial screen. (In: Dashboard Technical Guide 1.0)
Steady state: Steady pedal and MAP, within the transient limits (5% TPS and 0.05 bar MAP, by default); the RPM may rise, as in a full-throttle pull. Only at steady state does the loop correct and learn, and only a steady-state segment, after the O2 sensor delay, serves to read the VE in the log. (In: VE Technical Guide 1.1)
Steady-state enrichment: Percentage that stays on with the warm engine at steady state, such as warm-up above the minimum temperature of the loop or gear. The loop treats it as an error and the learning may record it. (In: VE Technical Guide 1.1)
STFT: Short-term fuel trim, the Fast correction (STFT) of the loop: it corrects the O2 sensor error right now, a single value for the engine point, and goes to zero with the engine stopped. In the log: VE closed loop - STFT. (In: VE Technical Guide 1.1)
STFT saturated (VE probably wrong): State with the fast correction at the limit for more than 30 s: the error is bigger than the limit and the learning stops. Correct the region by hand, from the log. (In: VE Technical Guide 1.1)
Stoichiometric AFR: AFR of the chemically correct mixture of the fuel in use; it divides the air mass in the calculation. It comes from the Fuel: 12.6 in Regular BR Gasoline (E27) (Brazil) and 8.4 in Ethanol (pump) (Brazilian hydrous ethanol). (In: VE Technical Guide 1.1)
Style: Gauge design: Modern (default), Classic, Neon and Cyberpunk. The Tachometer has only 3. Only Modern draws a gradient in most fields. (In: Dashboard Technical Guide 1.0)
SVG Button: Indicator that turns on and off from a flag-type measurement. It does not respond to touch, despite the name. (In: Dashboard Technical Guide 1.0)
Sync: The VCU recognizes the wheel and, with a phase sensor, confirms the phase. Before it the RPM is 0 and the valve is not driven. (In: High-Pressure Pump (HPFP) Technical Guide 1.1)
target: Device the dashboard is designed for (7 targets; Media Device is reserved in this version), chosen in Device. (In: Dashboard Technical Guide 1.0)
TCU: Transmission Control Unit. The transmission's own control module (External TCU). (In: CAN Technical Guide 1.2)
TDC: Top dead center. The pump angles count from the TDC of cylinder 1, like those of injection and ignition. It is not the lobe peak. (In: High-Pressure Pump (HPFP) Technical Guide 1.1)
Terminator: 120 Ω resistor between CAN_H and CAN_L, one at each end of the bus. (In: CAN Technical Guide 1.2)
Time based compensations: Native function of the Drag Race Features menu that applies corrections by time. On the ETC opening limit, it wins over the custom function; on the O2 closed loop target, the custom function wins. (In: Custom Functions Technical Guide 1.1)
Time constant (tau): Measure of how slow a filter is: at 1 tau the output reaches 63% of a step. The larger it is, the slower the output follows the input. (In: Custom Functions Technical Guide 1.1)
Time for validation and Delay to start: Fields of the VCU alerts, such as Error in the CAN port: how long the failure must last (Time for validation) and the delay before the alert starts watching (Delay to start). (In: CAN Technical Guide 1.2)
Time quanta: Time slices into which the controller divides each bit. (In: CAN Technical Guide 1.2)
Timeout: Maximum time without receiving a frame before considering the data invalid. (In: CAN Technical Guide 1.2)
TPS: Throttle position sensor, in %. (In: Custom Functions Technical Guide 1.1); Throttle position, in %, and the sensor that measures it. It is the axis of the MAP estimated by TPS table and one of the sources of acceleration fuel enrichment. (In: VE Technical Guide 1.1)
Transbrake: Drag racing function that holds the car at the launch. (In: Dashboard Technical Guide 1.0)
Transfer: Passing a fraction of the fast correction to the LTFT, when it stays at 1.5% or more for 4 s in a row in the same active cell, the closest one to the engine point. (In: VE Technical Guide 1.1)
Transient: Quick change of load: TPS varying more than 5% or MAP more than 0.05 bar, at the defaults. It freezes the fast correction and blocks the learning. (In: VE Technical Guide 1.1)
Transport delay: Time between the injector injecting and the O2 sensor seeing the result. The VCU estimates it and compares the O2 sensor with the target delayed by that time; the value is in VE closed loop - Estimated delay. (In: VE Technical Guide 1.1)
Trigger wheel: Toothed wheel whose sensor reports the engine speed to the VCU. The fuel calculation is redone on every revolution of it. (In: VE Technical Guide 1.1)
Trim: PID correction with feed-forward on, in ms, between the floor (PID minimum trim or Trim floor: feedforward fraction) and the PID maximum trim. (In: High-Pressure Pump (HPFP) Technical Guide 1.1)
Two's complement: Standard way to write negative numbers in binary. In an 8-bit signed signal, raw value 255 is worth −1. (In: CAN Technical Guide 1.2)
Undo / Redo: A single history for all targets and screens, with 50 steps. (In: Dashboard Technical Guide 1.0)
Use ... sensor: Switches on the Sensors and failsafe tab: on, the calculation reads the sensor; off, it uses the failsafe. They are on by default: without an air temperature or fuel pressure sensor, turn off the switch for it. (In: VE Technical Guide 1.1)
Useful time: Time in which the injector actually injects, with the deadtime already subtracted (also called effective pulse width). In the log, with the enrichments already included: Injection time A minus Primary injectors deadtime. (In: VE Technical Guide 1.1)
User screen: Screen with fields, tables and texts built in the Screen editor. With a password on the function, it is what the customer edits. (In: Custom Functions Technical Guide 1.1)
Value 1 / Value 2 / Angle 1 / Angle 2: The pointer goes to Angle 1 at Value 1 and to Angle 2 at Value 2 (section 17.4). (In: Dashboard Technical Guide 1.0)
Value for VCU: Block that writes a value to a VCU channel. (In: Custom Functions Technical Guide 1.1)
VCU: Vehicle Control Unit. Name FuelTech uses for the units of the VisionFT line (FT700, FT470). (In: CAN Technical Guide 1.2); FuelTech control unit, such as the FT700 and the FT470, that runs the custom functions. Some screens and messages call it ECU. (In: Custom Functions Technical Guide 1.1); FuelTech control unit, FT700 or FT470, that controls the pump valve. (In: High-Pressure Pump (HPFP) Technical Guide 1.1); The electronic control unit that runs the map and commands the injection: FT700 or FT470 in this guide. (In: VE Technical Guide 1.1)
VCU / ECU: FuelTech control unit installed in the car (FT700, FT700 Plus, FT470): it stores the map and sends the measurements to the dashboard. Some screens show ECU: ECU model and ECU Button; the command field of that button reads VCU Command. (In: Dashboard Technical Guide 1.0)
VCU action: Output block that asks the VCU to change a native function, for example to add ignition advance. (In: Custom Functions Technical Guide 1.1)
VCU value: Block that reads a VCU channel and delivers the value to the drawing. (In: Custom Functions Technical Guide 1.1)
VE closed loop - State: Channel with the number of the loop state; the VE learning (LTFT) screen shows the same state in text. Only the one with the highest priority appears. (In: VE Technical Guide 1.1)
VE factor: Total correction that multiplies the VE of the table: (1 + applied LTFT) × (1 + STFT). 1.000 is no correction; by default, it stays between 0.75 and 1.25 (VE closed loop - VE factor). (In: VE Technical Guide 1.1)
VE learning (LTFT): Learning screen, with the Live, Diagnostic and Commit to VE pages. It only works with the VCU connected; on the computer, it is in the Tools menu. (In: VE Technical Guide 1.1)
VE mode: Mode of calculating the injection from the engine's volumetric efficiency, an alternative to the time-based mode. VE is volumetric efficiency; the electric vehicle, in this guide, is EV. (In: Custom Functions Technical Guide 1.1)
VECTOR__INDEPENDENT_SIG_MSG: Dummy message that some programs add to the DBC. On import, it takes up one frame. (In: CAN Technical Guide 1.2)
VFrameFormat: DBC attribute that says whether the message is classic CAN or CAN FD. (In: CAN Technical Guide 1.2)
Video Overlay / Video Overlay Composer: PC-only target (1 screen, single background) and the tool that generates an MP4 with the gauges over a video, from an .ftlog. (In: Dashboard Technical Guide 1.0)
Volumetric efficiency (VE): Ratio between the air that enters the cylinder on each cycle and what would fit in its displacement, at the absolute pressure and the temperature of the manifold. It measures only the filling; it is not a load index. (In: VE Technical Guide 1.1)
VVT: Variable valve timing (Variable camshaft (VVT)). With Cam dependence, the pump window follows the cam offset. (In: High-Pressure Pump (HPFP) Technical Guide 1.1)
W (demand): Consumption in ms corrected to 100 bar. Axis of the G(W) curve. The screen does not show the unit. (In: High-Pressure Pump (HPFP) Technical Guide 1.1)
warning light: Image, GIF or SVG Button that lights up from a measurement. The screen does not use the name. (In: Dashboard Technical Guide 1.0)
White input / Input sensor: Physical VCU input, on the white wire of the wiring harness. The Input sensor is the polarity, and it is the one that applies to the physical screen-change button. (In: Dashboard Technical Guide 1.0)
White wire input: Name of the VCU's analog inputs in FuelTech Vision. Inputs #15 to #18 share the pin with analog outputs #1 to #4 (Analog Outputs screen). (In: Custom Functions Technical Guide 1.1)
Wideband O2 sensor: Sensor in the exhaust that measures the lambda of the burned mixture. Each sensor needs a conditioner, the circuit that reads it: the FT700 has 2 internal ones and the FT470 has 1; the other sensors come in through an analog input or CAN. (In: VE Technical Guide 1.1)
Window: Range of crankshaft degrees of lobe #1 between the opening and the closing. The width (closing − opening) is the pulse ceiling. (In: High-Pressure Pump (HPFP) Technical Guide 1.1)
Window upper limit: Maximum pulse duration that the window width allows: width ÷ (0.006 × rpm). The signal GDI - Lobe window upper limit rail 1 indicates when it limits the pulse. (In: High-Pressure Pump (HPFP) Technical Guide 1.1)
WMI: Water-methanol injection. (In: Dashboard Technical Guide 1.0)
Working memory: Space of 512 bytes, for the whole map, where the blocks keep states and results. It appears as RAM; the VCU error message calls it execution memory. (In: Custom Functions Technical Guide 1.1)
Workspace: Each of the map's 10 custom functions, from Custom function 1 to 10. Some screens use this term. (In: Custom Functions Technical Guide 1.1)
Write / Write VCU: Upload of the map to the VCU: Write on the PC (tooltip Write VCU), Write VCU on the phone and tablet. Commands and confirmations in section 17.6. (In: Dashboard Technical Guide 1.0)
Yellow output: Name of the VCU's half bridge outputs in FuelTech Vision (Yellow outputs screen). (In: Custom Functions Technical Guide 1.1)