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Engine Management Jargon/Terms Glossary 
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I'll add more to this thread as people ask questions here :

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Acronyms

General :
EMS = Engine Management System
ECU = Electronic Control Unit, Engine Control Unit
MS = Mega Squirt
COP = Coil On Plug
CNP = Coil Near Plug
RPM = Revolutions Per Minute

Sensors :
CHT = Coolant/Head Temperature, Cylinder Head Temperature
CLT = Coolant Temperature (MS speak)
MAT = Manifold Air Temperature
IAT = Intake Air Temperature
MAP = Manifold Absolute Pressure
MAF = Mass Air Flow
VAF = Volume Air Flow
TPS = Throttle Position Sensor
CPS = Crank Position Sensor, Cam Position Sensor
CAS = Cam Angle Sensor, Crank Angle Sensor
EGT = Exhaust Gas Temperature
VSS = Vehicle Speed Sensor

Exhaust :
NB = Narrow Band
WB = Wide Band
WBO2 = Wide Band Oxygen
O2 = Oxygen
Lambda = Fuel independent AFR unit of measurement
EGO = Exhaust Gas Oxygen
AFR = Air Fuel Ratio

Software :
FOSS = Free (and) Open Source Software
ISR = Interrupt Service Routine

Hardware :
ECT = Enhanced Capture Timer
PIT = Periodic Interrupt Timer
ADC = Analog (to) Digital Converter
DAC = Digital (to) Analog Converter
ATD = Analog To Digital
BDM = Background Debug Module
PWM = Pulse Width Modulation
SCI = Serial Communication Interface
SPI = Serial Peripheral Interface

Variables :
PW = Pulse Width
FPW = Fuel Pulse Width, Final Pulse Width
TPW = Total Pulse Width
MPW = Master Pulse Width
EPW = Electric Pulse Width
IDT = Injector Dead Time
IOT = Injector Opening Time (ms speak)
BRV = Battery Reference Voltage
AAP = Atmospheric Absolute Pressure
LT = Lambda Target
VE = Volumetric Efficiency
PL = Percent Load
MFT = Master Fuel Trim
PCFT = Per Cylinder Fuel Trim
CHE = Coolant / Head Enrichment
ETE = Engine Temperature Enrichment
PSE = Post Start Enrichment
ASE = After Start Enrichment (ms speak)
TFC = Delta Fuel Correction
DFC = Transient Fuel Correction

Fred.

_________________
DIYEFI.org - where Open Source means Open Source, and Free means Freedom
FreeEMS.org - the open source engine management system
FreeEMS dev diary and its comments thread and my turbo truck!
n00bs, do NOT PM or email tech questions! Use the forum!
The ever growing list of FreeEMS success stories!


Sun Jun 22, 2008 12:54 pm
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Joined: Tue Jan 15, 2008 2:31 pm
Posts: 14771
Location: Home sweet home!
Explanations

[insert information here]

Fred.

_________________
DIYEFI.org - where Open Source means Open Source, and Free means Freedom
FreeEMS.org - the open source engine management system
FreeEMS dev diary and its comments thread and my turbo truck!
n00bs, do NOT PM or email tech questions! Use the forum!
The ever growing list of FreeEMS success stories!


Mon Jun 30, 2008 1:53 pm
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