7.1 KiB
Abbreviations and Terminology
This document contains all of the commonly used abbreviations and terminology used by rusEFI
BMEP - Brake mean effective pressure
CoV - Coefficient of variability
CR - compression ratio
DI - Direct injection
DISA - BMW variable inlet manifold resonance system
EGR - Exhaust gas recirculation
EGT - Exhaust gas temperature
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 driver - 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.
IMEP - Indicated mean effective pressure
Injector impedance - The resistance of the fuel injectors, see high and low Z
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
MBT - Mean best timing, used in context of spark timing, it is the spark timing that results in the best torque
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
NTC - Negative temperature coefficient, used in context of temperature sensors and refers to the resistance increasing as temperature decreases.
PFI - Port fuel injection
PID - A proportional–integral–derivative controller
PNP - Plug and play
Primary coil - The primary winding of an ignition coil
RE - rusEFI
REO - rusEFI Online
Secondary coil - The secondary winding of an ignition coil.
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
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
TE - TE connectors, they produce the ampseal connectors on the proteus and a lot of OEM ECUs.
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.
VISA - BMW variable inlet manifold length system
VSS - Vehicle speed sensor
VVT - Variable valve timing
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
CAS
Crank Angle Sensor Also See CPS
CLT
Coolant Temperature
CPS
Crankshaft Position Sensor
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.
EOI
End Of Injection - See also SOI
IFR
Injector Flow Rate
IGBT
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.
IPW
Injector Pulse Width
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.
NGC
Chrysler Next Generation Controller
PIP
Profile ignition pickup See http://en.wikipedia.org/wiki/Profile_ignition_pickup
RUSEFI
Really Uber Simple EFI? Robust Ultra Simple EFI? Retarded Unproven Shitty EFI?
SOI
Start Of Injection - See also EOI
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.
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.
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.
TDC
Top Dead Center
TFI
Thick Film Ignition - Ford distributor - Likely unsupported at this time.
VE
Volumetric Efficiency, often expressed as a decimal value i.e. 0.8 (for 80%)
VOL
Short for engine volume
WOT
Wide Open Throttle