11 KiB
Acronyms, Abbreviations and Terminology
This document contains all of the commonly used acronyms, abbreviations and terminology used by rusEFI
AAP
Absolute Atmosphere Pressure
AFR
Air Fuel Ratio - See also Lambda, Stoichiometric AFR is the ratio of air to fuel, often expressed as "14.7:1"
AIT
Air Intake Temperature
Baro
Shorthand for Barometric pressure
BTDC
Before TDC, Before Top Dead Center - See also ATDC
BMEP
Brake mean effective pressure
CAS
Crank Angle Sensor Also See [CPS - Wikipedia]](http://en.wikipedia.org/wiki/Crankshaft_position_sensor)
CLT
Coolant Temperature, same as ECT
CoV
Coefficient of variability
CPS
Crankshaft Position Sensor
CR
compression ratio
DI
Direct injection
DISA
BMW variable inlet manifold resonance system
EDIS
Electronic Distributorless Ignition System - An older Ford ignition system that combined a set of ignition IGBTs and some electronics to assist the ECU. Obsolete on modern ECUs.
EGO
Exhaust Gases Oxygen - see also lambda sensor, WBO2,
Often used when referring to air fuel sensors like the lambda sensor.
Sometimes also used as HEGO or Heated Exhaust Gas Oxygen.
EGR
Exhaust gas recirculation
EGT
Exhaust gas temperature
EOI
End Of Injection - See also SOI
ETB
Electronic throttle body
EVC
Exhaust valve closing
EVO
Exhaust valve opening
GDI
Gasoline Direct Injection
Hall
A type of sensor that requires a power and earth wire in addition to its signal wire, the output is normally a 5v square wave.
High Side
A driver that is open circuit when off and powered to 5v or 12v when on.
High/Low
a pushpull or HighLow is an output that is powered "high" (12v or 5v) and switched to low (earth).
High and Low Z
High and low resistance, used in terms of fuel injectors, normally around 14 ohms for high impedance and ~4 ohms for low.
IAT
Intake Air Temperature
IFR
Injector Flow Rate
IGBT
[IGBT - Wikipedia]](http://en.wikipedia.org/wiki/Insulated-gate_bipolar_transistor)
A common type of transistor used for switching high power devices like ignition coils with a low power/voltage output.
IMEP
Indicated mean effective pressure
Injector Impedance
The resistance of the fuel injectors, see high and low Z
IPW
Injector Pulse Width
IVC
Intake valve closing
IVO
Intake valve opening
Low side
A driver that is open circuit when off and grounded to earth when switched on.
LQFP
Low profile quad flat package
MAF
Mass Air Flow, often used in the context of air flow or load sensors.
MAP
Manifold Absolute Pressure or perhaps Manifold Air Pressure, often used in the context of load sensors.
MBT
Mean best timing, used in context of spark timing, it is the spark timing that results in the best torque
MLV
Mean the tool MegaLogViewer
MFB
Mass fraction burned, often stated with a number after i.e. MFB10/MFB50/MFB90 and refers to the fraction of the fuel burned by mass.
MRE
Micro rusEFI
NGC
Chrysler Next Generation Controller
NTC
Negative temperature coefficient, used in context of temperature sensors and refers to the resistance increasing as temperature decreases.
PIP
Profile ignition pickup See [Profile Ignition Pickup - Wikipedia]](http://en.wikipedia.org/wiki/Profile_ignition_pickup)
PFI
Port fuel injection
PID
A proportional–integral–derivative controller
PNP
Plug and play
PPS
Pedal Position Sensor
Primary Coil
The primary winding of an ignition coil
RE
rusEFI
REO
rusEFI Online
RUSEFI
Really Uber Simple EFI? Robust Ultra Simple EFI? Retarded Unproven Shitty EFI?
Secondary Coil
The secondary winding of an ignition coil.
Sequential
Often this refers to Sequential injection, which means the injectors fire individually for each cylinder and often at a specific crank angle.
This can be handy for engines direct injection or to try to spray the injector into the cyl while the intake valve is open. If an engine can inject onto an open inlet valve it will reduce the amount of fuel wetting the port walls and help reduce low load emissions.
Sequential is required for direct injection engines like common rail diesel.
SBC
Small Block Chevy
SD
Speed Density this is a method of predicting how much fuel should be delivered to an engine. This is a MAP based system which uses pressure to make a prediction of how much O2 is entering the cyl.
SI
Spark injection
Smart Coil
A type of ignition coil that has its ignition drivers (IGBT) built into the coil, this means they only receive a 5v signal to activate.
SMD
Surface mount device, interchangeable with SMT
SMT
Surface mount technology, interchangeable with SMD
SOI
Start Of Injection - See also EOI
Staged injection
The use of 2 injectors for one cyl. This commonly means at low RPM and lower loads, one injector is turned on which allows for finer control over idle fuel delivery, while at higher RPM and higher Loads both injector inject fuel which allows for larger amounts of fuel to be delivered.
Stoichiometric
The ideal quantity of fuel to burn with a quantity of air for complete combustion. For gasoline this is 14.7:1, ethanol is 9:1 and methanol 6.47:1
SOIC
small outline integrated circuit
TDC
Top Dead Center
TPS
Throttle Position Sensor
TMAP
A sensor combining IAT ("Temperature") and MAP
TE
TE connectors, they produce the ampseal connectors on the proteus and a lot of OEM ECUs.
TFI
Thick Film Ignition - Ford distributor - Likely unsupported at this time.
TFSI
Turbo Fuel Stratified Injection - A VW direct injection lean burn strategy
TLE
Short for TLE8888 the Infineon chip on the MRE
TVIS
Toyota variable intake system, a variable inlet length system that switches on/off a set of longer intake manifold runners.
Valvetronic
BMW variable valve lift system
VANOS
BMW variable valve timing system
VCC
Common Collector Voltage; the positive supply voltage for an integrated circuit
VDD
the DC Power supply connected to Drain Terminal of any FET circuit.
VE
Volumetric Efficiency, often expressed as a decimal value i.e. 0.8 (for 80%)
VISA
BMW variable inlet manifold length system
VOL
Short for engine volume
VSS
Vehicle speed sensor
VVT
Variable valve timing
WBO
Wide Band Oxygen, same as EGO
WOT
Wide Open Throttle