EFI References -- Sources of Information on Engine Management
This is a list of books and articles gathered from the diy_efi
list. If you have any other titles, please let me know.
Currently maintained by Mark
Wilcutts
Books
Many of these books can be ordered directly from the SAE
bookstore or from internet bookstores like Amazon.com.
-
Adler, Ulrich, Electronic Gasoline Fuel-Injection System with Lambda
Closed-Loop Control, L-Jetronic: Technical Instruction, Robert
Bosch GmbH, 1985, ISBN 1-85-226008-4.
-
Yellow book, 20 numbered pages; "English translation of the German edition
dated: September 1985."
-
Adler, Ulrich, Mechanical Gasoline Fuel-Injection System with Lambda
Closed-Loop Control, K-Jetronic: Technical Instruction, Robert
Bosch GmbH, 1981, ISBN 1-85-226030-0.
-
Yellow book, 24 numbered pages; "English translation of the 2nd German
edition dated: September 1985."
-
Adler, Ulrich, Combined Ignition and Fuel-Injection System with
Lambda Closed-Loop Control, Motronic: Technical Instruction,
Robert Bosch GmbH, 1985, ISBN 1-85-226009-2.
-
Yellow book, 44 numbered pages; "English translation of the 2nd German
edition from September 1985."
-
Adler et al, Automotive Electric/Electronic Systems, Robert
Bosch GmbH, 1988, ISBN 0-89883-509-7.
-
The "red" handbook. Covers all forms of automotive systems. Good
general reading with excellent coverage of basic functions like starters,
alternators, ignition, spark plugs. Covers some detail of Bosch's
fuel injection systems. Available from the SAE on sale for $19 (order
B-528).
-
Adler et al, Automotive Handbook, 3rd Edition, Robert Bentley, Cambridge,
MA, 1993, ISBN 0-8376-0330-7.
-
The "blue" handbook which used to be pocket size. Covers all forms
of automotive design and systems. Good reference source, expressed
in metric. Has conversion tables. Covers materials well. Some
data on emissions (478-489) similar to 2nd Edition. Also has data
on some of the representative automobiles from various world companies
in back section. Available from the SAE for $29 (order BOSCH3).
Price for SAE members is $23.
-
Adler, Emission Control for Spark-Ignition Engines, "Bosch
Technical Instruction", Robert Bosch, Stuttgart, Germany, 1985.
-
Covers basics of emissions, EGR, and catalytic converters. Also briefly
covers K-Jetronic, KE-Jetronic, L-Jetronic, LH-Jetronic, Mono-Jetronic,
and Motronic systems. Sections on other measures, testing and regulations.
-
Adler, U., Battery Ignition Systems, "Bosch Technical Instruction",
Robert Bosch, Stuttgart, Germany, 1971.
-
Covers the basics of ignition systems in basic breaker systems and simple
electronic versions. Good general data on spark requirements.
-
Adler, U., Electronic Battery-Ignition Systems, "Bosch Technical
Instruction", Robert Bosch, Stuttgart, Germany, 1976.
-
Covers more advanced electronic ignition systems. Good general data
on spark requirements.
-
Bell, Corky, Maximum Boost: Designing, Testing, and Installing Turbocharger
Systems, Robert Bentley, 1997, ISBN 0-8376-0160-6
-
Lots of good info on turbos and system design. Sizing, fueling, IC
selection, volume considerations, cooling, system layout, etc., etc. Shows
several examples of turbo systems and also shows how *not* to do things.
-
Bosch Electronic Fuel Injection Systems, Shop Manual, , Motorbooks
International, Osceola, Wisconsin, 1986, ISBN 0-87938-237-6.
-
Maintenance manual for Audi, BMW, Cadillac, Datsun, Mercedes, Opel, Porsche,
Renault, Saab, Volkswagen, and Volvo, model years 1970-1979.
-
Hartman, Jeff, Fuel injection - Installation, Performance Tuning, Modifications,
ISBN 0-87938-743-2, Motorbooks international, PO Box 1, Osceola, WI 54020,
1-800-826-6600
-
Probably the best value for money book on EFI. The book has snippets of
everything - If it had detail on all the subjects it mentioned it would
be the definitive reference. The audience is intended as street rodders
mainly, but there are good bits and pieces for the DIY-EFI'er. Recommended
Price $19.95 US.
-
Heisler, Heinz, Advanced Engine Technology, ISBN 1-56091-734-2, 1995.
-
A very nice book on all types of engine technology, has chapter on fuel
injection that describes Bosch systems in some detail, and a chapter on
ignition systems. Available from the SAE.
-
Heywood, J.B., Internal Combustion Engine Fundamentals, McGraw-Hill,
USA, ISBN 0-07-028637-x, 1988.
-
College text on IC engine design and theory. General reference on
engine topics, also contains many references to other works. Available
from the SAE for $85 (order B-526).
-
Laser/Talon Tech Info Manual
-
Call 1-800-626-1523 and ask for part number 81-699-9039. Shipping
will probably be more than the cost of this ~200 page book. They
take plastic.
-
Lenz, D.H.P., Mixture Formation in Spark-Ignition Engines, SAE,
Warrendale, PA, ISBN 1-56091-188-3, 1992.
-
Excellent text on carburation, combustion and fuel injection concepts.
Some important data on emissions (pp. 70-74, 249-251) with description
of trends over years. This book also published by Springer-Verlag/Wien,
NY, who translated it from German (Lenz, Gemischbildung bei Ottomotoren)
in 1990. Available from SAE for $99 (order R-113). Price for
SAE members is $88.
-
Mitchell International, Inc., Mitchell's Electronic Fuel Injection Troubleshooting
Guide: Import Vehicles, Fisher Books, Tucson, Arizona, 1989, ISBN 1-55561-031-5.
-
Chapter contents include Bosch D, K, KE, L, LH, and Digifant (Japanese
and European); Daihatsu; Honda PGM-FI; Isuzu I-TEC; Lucas-Bosch; Mazda
RE-EGI; Mitsubishi ECI and MPFI; Nissan TBI; Subaru SPFI; this book
has the EFI system wiring diagrams of many import cars.
-
Mitchell International, Inc., Mitchell's Electronic Fuel Injection Troubleshooting
Guide: Domestic Vehicles, Fisher Books, Tucson, Arizona, 1991, ISBN
1-55561-032-3.
-
Chapter contents include AMC/Jeep; AMC; AMC/RENIX; AMC/RENIX II; Bosch;
Chrysler; Eagle; Ford; GM; this book has the EFI system wiring diagrams
of many domestic cars.
-
Norbye, Jan P., Automotive Fuel Injection Systems, A Technical Guide,
Motorbooks International, Osceola, Wisconsin, 1981, ISBN 0-87938-139-6.
-
Primarily a history and description of fuel injection systems, includes
chapters on Bosch Mechanical Systems for Mercedes-Benz Cars, Kugelfischer
Fuel Injection, Rochester Fuel Injection, The Bendix Electrojector, Cadillac
and the Bendix Analog and Digital Fuel-Injection Systems, Bosch L- and
K-Jetronic, Motronic, Mono-Jetronic, Lucas Digital Fuel Injection, Chrysler's
Single-Point Injection; Ford's Electronic Engine Control System, Zenith
Fuel Management Systems, Fiat/Marelli Experimental System, Bosch / Pierburg
Electronic Carburetor, Aftermarket Fuel Injection.
-
Probst, Charles O., Bosch Fuel Injection & Engine Management,
Robert Bentley, Cambridge, MA, ISBN 0-8376-0300-5, 1989.
-
Covers most of the Bosch systems from D-Jetronic through Motronic. Covers
variety of vehicles. Has good section in beginning on combustion
and emissions information, but a better description is in other BOSCH texts
and sources. Available from the SAE on sale for $19 (order B-557).
-
Probst, Charles O., Ford Fuel
Injection & Electronic Engine Control, 1980-1987: How to Understand,
Service and Modify, Robert Bentley, Cambridge, MA, ISBN 0-8376-0302-1.
-
Covers basic engine control theory and Ford systems to 1988. Excellent
book on topic. Similar to author's other work on Bosch systems.
-
Probst, Charles O., Ford Fuel
Injection & Electronic Engine Control 1988-1993: How to Understand,
Service, and Modify, Robert Bentley, Cambridge, MA, ISBN 0-8376-0301-3,
1995.
-
Ribbens, William B., Mansour, Norman P., et al, Understanding Automotive
Electronics, third edition, Howard W. Sams & Company, Indianapolis,
Indiana, 1988, ISBN 0-672-27064-6.
-
Contents include: Automotive Fundamentals, The Systems Approach to Control
and Instrumentation, Electronics Fundamentals, Microcomputer Instrumentation
and Control, Sensors and Actuators, The Basics of Electronic Engine Control,
Digital Engine Control System, Vehicle Motion Control, Automotive Instrumentation,
Diagnostics, Future Automotive Electronics Systems.
-
SAE, On-Board Diagnostics for Light and Medium Duty Vehicles Standards
Manual, SAE HS-3000
-
Contains set of 12 SAE Standards pertaining to OBD-II systems, including
J1850-Communication Protocol, J1930-Terms and Definitions, J1962-Diagnostic
Connector, J1978-OBDII Scan Tool, J1979-Diagnostic Test Modes, J2012-Diagnostic
Trouble Codes. 254 pages, paperbound. Order from SAE, $79.
-
Watson, Ben, How to Tune and Modify Bosch Fuel Injection, Motorbooks
International, Osceola, WI, ISBN 0-87938-570-7, 1992.
-
Covers most of the Bosch systems from D-Jetronic through LH-Jetronic. Mainly
aimed at VW. Has good section in beginning on testing electronic
components. Minimal amount of emissions information - better
description is in other BOSCH texts and sources. Cost $19.95 in 1994.
-
Watson, Ben, How to Tune and Modify Ford Fuel Injection, Motorbooks
International, Osceola, Wisconsin, 1992, ISBN 0-87938-621-5.
-
"For Fuel-Injected Ford Cars and Trucks with EEC III and EEC IV Engine
Maintenance Systems," chapters include History of Fuel Injection,
Brief Overview of Electronics, Tools, Tuning the Fuel-injected Engine,
Automotive Emissions, EEC III, EEC IV Components and Operation, EEC IV
Onboard Diagnostics, Troubleshooting by Symptom, Performance Modifications,
Legalities of Engine Modification. The performance chapter is weak, only
10 pages.
-
Watson, Ben, How to Repair and Modify Chevrolet Fuel Injection,
Motorbooks International, Osceola, Wisconsin, 1991, ISBN 0-87938-502-2.
-
Westbrook, M. H. and J.D.Turner, Automotive sensors, Institute of
Physics Pub., c1994.
-
Physical principles of many types of engine sensors
Papers
This is a collection of papers that have been referenced on the mailing
list at some point in time. To see possibly more extensive comments, do
a context search of the archive for the paper number.
SAE papers are available from the SAE (412)776-4970, Fax
(412)776-0790 , http://www.sae.org/PRODSERV/papers/paprinfo/pap_indx.htm
Papers are $6 a piece for SAE members, $12 for non-members. Many engineering
schools will have the Special Publications (collections of papers), and
papers themselves on microfiche.
SAE's web site also has a free
(free, from SAE?) index of papers published in the last year . Be aware
that most SAE papers are from conference where research is presented, and
not necessarily useful for finding hard information on current EFI systems.
-
Electronic Engine Controls. SAE Special Publications.
-
Annual collections of papers from the SAE International Congress and Exposition.
Mostly articles on nifty research done in universities and at motor companies.
-
750346 "HEI-A New Ignition System Through New Technology"
-
It covers the charge time question as well as their solution. It
describes some really clever innovations: adjustable dwell depending on
how near saturation, a 5.5 amp limit in the driver so you could have a
low resistance for fast saturation times at high speeds, but that wouldn't
fry at low speeds.
-
790742 "Ford's 1980 Central Fuel Injection System", Czadzeck and Reid from
Ford.
-
Readable paper on the Ford CFI 5.0L 1980 cars. It covers most of the 'twiddle
factors' required to get the vehicle running properly.
-
800164 "Throttle Body Fuel Injection (TBI) an Integrated Engine Control
System"
-
Covers GM TBI system. Easy reading. Also in SAE Trans. Vol. 89.
-
800468 "Hot Wire Air Mass Meter - A New Air Flow Meter for Gasoline Fuel
Injection Systems", Sauer, Rudolf, from Bosch.
-
This paper appears to be one of the first on MAF meters - the classical
Bosch design with the thin platinum wire in the direct air flow.
It has many equations explaining its operation.
-
810449 "Mathematical Model of a Throttle Body Fuel Injection System"
-
Discusses effect of battery voltage on injectors and fuel pump pressure
-
810494 "Transient A/F Control Characteristics of the 5 Liter Central Fuel
Injection Engine"
-
also in SP-487 and SAE Trans, Vol. 90
-
810495 "Transient Mixture Strength Excursions - an Investigation of their
Causes and the Development of a Constant Mixture Strength Fueling Strategy"
-
Also in SP-487 and SAE Trans., Vol 90.
-
830615 "Hot Wire Air Flow Meter for Engine Control System", Nishimura,
Ohyama, Sasayama, et al. from Hitachi.
-
This paper describes the Hitachi type MAF, which measures air flow in a
bypass air passage. I believe that this type of MAF is being used
on Ford cars, starting with the Mustang GT in 1987.
-
840137 "Bosch Mass Air Flow Meter: Status and Further Aspects", Sumai and
Sauer from Bosch.
-
Discusses flow passages, air flow around the thermal element, use of wire
grid in the air flow stream, mechanical forces on the sensor element, dirt
build up on the thermal sensor element, response rate, velocity profiles,
and influence of altitude on intake manifold pulsations. Actual test
data is provided.
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850044 sect7
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Toyota lean burn combustion system - contains info about the lean burn
mix sensor and lean A/F ratio calibration map, comparison between sequential
and simultaneous EFI on torque fluctuation and misfire limit. Helical port
vs. straight port on torque. It also has a guide of optimum injection timing
on seq EFI for various speed and load. Very interesting and easy to read
report!
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850074 sect 1
-
Effects of intake valve closing times on combustion.
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850293
-
A new low pressuse single point inj. system (Bosch Monotronic). A guide
for you guys who by some reason want to calculate w/o MAF or MAP. Open
or closed loop.
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850293
-
Soot formation on multipoint fuel inj engine. A very comprehensive report
from GM on the very delicate topic injector aiming. It also tests the effect
of sequential injection timing on emmision. In the closing they wrote "...injection
targeting is the most significant parameter to reduce smoke and HC in MPFI
engines".
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851674
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Fuel atomization
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851675
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Toyota central injection system.
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870128
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Fuel inj on 4 valve eng. A Nissan report about the problems with transient
enrichment and fuellag. Also a good comparison between different injection
methods on emissions and fuel economy. Fuel pushback and timing, uneveness
between cylinders etc. A must for the serious DIY-EFI'er.
-
880561 "Frequency Domain Characterization of Mass Flow Sensors", W. C.
Follmer.
-
890298 "Switching Controlled Thermal Mass Air Flow Sensor", Tanimoto, Bessho,
Inada from Mitsubishi Electric.
-
(Also available in SP-771 - Sensors and Actuators: 1989).
Discusses a typical MAF meter using a switching transistor to supply the
voltage to the heated wire. This reduces power consumption.
The output of the meter is a digital signal, with the pulse width related
to the flow rate. One advantage of this type of meter is that
the EFI computer does not need an analog to digital converter to acquire
the data - it can use a digital counter.
-
890301 "A Hot Wire Air Flow Meter for Intake Air Flow Measurement" Nishimura,
Ohyama, et al. from Hitachi.
-
Paper "outlines the development status of the Hitachi hot wire air flow
meter". Also covered are "approaches to improve response time" and
"to avoid deterioration in the measurement accuracy caused by dirt deposits
on the hot wire probe".
-
890459 "Combined Boost Pressure and Knock Control System for S.I. Engines
Including 3-D Maps for Control Parameters" Rohde and Philipp.
-
(Also available in SP-780). Authors are from Bosch. This
paper discusses the Motronic EFI system with knock sensor and turbo boost
pressure control; good info on control methods.
-
900258 "Hot Wire Air Flow Meter for Engine Control Systems" Takahashi,
Tsuruoka, Nishimura, et al. from Hitachi.
-
Discusses a new type of wire probe, resulting in improved response time.
-
900259 "Advanced Design for Bypass Type of Hot-Wire Air Flow Meter" Arai,
Sekine, et al. from Hitachi.
-
(Also available in SP-805 - Sensors and Actuators 1990.) Discusses
a bypass type MAF meter integrated into a throttle body.
-
900488 "Combustion Knock Sensing: Sensor Selection and Application
Issues" Dues, Adams, and Shinkle from Delco-Remy (now Delphi).
-
Discusses basic knock phenomena, sensor types, application issues, process
flowchart, location selection, sensor selection criteria, sensor comparisons,
popular misconceptions.
-
900616 "Mean Value Modelling of Spark Ignition Engines" Hendricks and Sorenson.
-
Technical University of Denmark researchers explore mathematical models
of engine processes.
-
900780 "On-Chip Realtime Operating System for the Engine Control System"
Matsubara, Kuwahara, and Gerhard from NEC Electronics.
-
Discusses the "NEC uPD78602 16-Bit Single-Chip Microcomputer that incorporates
a real-time operating system as firmware (alias Realtime Task Manager:
RTM) as an example.")
-
910258 "SI Engine Control and Mean Value Modeling" Hendricks and Sorenson
from TU Denmark.
-
Discusses modeling intake manifold and fuel film dynamics. SS and transient
fueling strategies, lambda control, idle-speed control.
-
910259 "A PC Engine Control Development System", Lillelund and Hendricks
from TU Denmark.
-
Describes interfacing an engine with PC running a realtime operating
system
-
910501 "Air-Fuel Ratio Sensor Utilizing Ion Transporation in Zirconia Electrolyte",
Sasayama, et al.from Hitachi.
-
Analysis of the behavior of ion transport, examines exhaust composition
effects on sensor output.
-
920289 "Operating Characteristics of Zirconia Galvanic Cells (Lambda Sensors)
in Automotive Closed-Loop Emission Control Systems",
-
Bozek, Evans, Tyree, and Zerafa of the US EPA.
-
Simple tests were performed to investigate the operating characteristics
of commercial oxygen sensors. Sensors exposed to typical gaseous components
of exhaust gas mixtures had maximum voltages when hydrogen, and, in some
instances, carbon monoxide, was available for reaction with atmospheric
oxygen that migrated through the cells’ ceramic thimbles in ionic form.
Dependence of galvanic activity on the availability of reducing agents
indicates that the cells are voltaic devices which operate as oxidation/reduction
reaction cells, rather than simple oxygen concentration cells.
-
930352 "Static Characteristics of ZrO2 Exhaust Gas Oxygen Sensors", Wang,
Soltis, Logothetis, Cook, and Hamburg from Ford.
-
Results of laboratory studies of the static characteristics of several
different commercial heated exhaust gas oxygen sensors. In these studies,
the emf of the sensors was measured as a function of temperature and of
the composition of calibrated gas mixtures. Several different binary gas
mixtures (H2/N2, CO/N2. C3H6/N2, C3H8/N2. and CH4/N2) were used together
with a variable amount of O2. Whereas at high temperatures thermodynamic
equilibrium appears to prevail, clear departures are observed at some lower
temperatures. This behavior is manifested by shifts of the emf step away
from stoichiometry, broadening of the step, abnormally high emf values
in excess oxygen mixtures, and abnormally low emf values in reducing gas
mixtures.
-
930856 "Transient A/F Ratio Errors in Conventional SI engine Controllers",
Hendricks, Jensen, et al. from TU Denmark.
-
Extensive tests of model-based fuel control algorithms.
-
940373 "Adaptive Air-Fuel Ratio Control of a Spark-Ignition Engine", Ault,
Jones, Powell,and Franklin.
-
Stanford researchers propose an adaptive control system.
-
940379 "A New Combustion Pressure Sensor for Advanced Engine Management",
Herden and Kuessel from Bosch.
-
Describes a new pressure sensor that they use for misfire detection, knock
control, ignition control, etc. I have a feeling that you may be seeing
these in pass. cars in the not too distant future. Still some signal processing
circuitry required but the price has to be better than a PCB or Kistler
unit.
-
950531 "Estimation of the Switch Point of an Exhaust Gas Oxygen Sensor
in General Exhaust Gas Environments",
-
Brailsford, Logothetis, Yussouff, Woestman from Ford. Mathematical
modeling and analysis of O2 sensor signals.
-
-
"Adaptive Transient Air-Fuel Ratio Control to Minimize Gasoline Engine
Emissions", Beaumont, Noble, and Scarisbrick of Ford/Ricardo, FISITA 1992.
-
"Individual Cylinder AFR Control with a Single EGO Sensor", Grizzle
J, Cook J and Dobbins K, American Control Conference 1990 pp 2881-2886.
-
Model the delays in the engine dynamics to determine which cylinder is
producing the puff of exhaust which is currently passing the EGO sensor.
The injectors can then be trimmed individually.
There are more references to SAE and IEEE papers at http://www.merkurgarage.com/encyclopedia/techart.html
Acronyms
Here's a list of acronyms relevant to EFI. An asterisk
(*) indicates terminology standardized in SAE Recommended Practice J1930.
An extensive list of acronyms used internationally is at: http://www.cybernet.dk/users/nez/forkort.htm
-
ACT = Air Charge Temperature. (= IAT*)
-
ADC = Analog to Digital Converter
-
A/D = Analog to Digital
-
AE = Acceleration Enrichment
-
A/F = Air Fuel Ratio (also AFR)
-
ALDL = Assembly Line Diagnostic Link. The connector under the dash
on non-OBDII GM cars. It can be used to dump diagnostic information
from the ECM with special equipment.
-
BLM = Block Learn Multiplier (or Matrix or Memory). A parameter in the
fuel control strategy that is adapted using O2 sensor feedback (= long
term FT*).
-
BP = Barometric Pressure
-
BPC = Base (fuel) Pulse Constant
-
BDC = Bottom Dead Center
-
C3I = Computer Controlled Coil Ignition (=EI*)
-
CAC* = Charge Air Cooler, i.e. intercooler
-
CAN = Controller Area Network. A network protocol used on overseas
vehicles. The US standard protocol is specified in SAE J1850, aka
OBD.
-
CARB* = Carburetor. (Also California Air Resources Board)
-
CDI = Capacitive Discharge Ignition
-
CFI* = Continuous Fuel Injection (also, Central Fuel Injection)
-
CKP* = Crankshaft Position (sensor)
-
CIS = Continuous Injection System (= CFI*)
-
CL* = Closed Loop
-
CMP* = Camshaft Positon (sensor)
-
CPU = Central Processing Unit
-
CTS = Coolant Temp Sensor (= ECT* sensor)
-
CYA = Cover Your Ass
-
DAC = Digital to Analog Converter
-
DFCO = Deceleration Fuel Cut-Off
-
DE = Deceleration Enleanment
-
DI* = Distributor Ignition
-
DIS = Distributorless Ignition System
-
DLC* = Data Link Connector
-
DLI = Distributor-Less Ignition (=EI*)
-
DSP = Digital Signal Processor
-
DTC* = Diagnostic Trouble Code. Self-test codes.
-
ECM* = Engine Control Module. It's the engine management computer.
-
ECT* = Engine Coolant Temperature
-
ECU = Electronic Control Unit (= ECM*)
-
EEC = Electronic Engine Control (Ford's ECM)
-
EFI = Electronic Fuel Injection
-
EGO = Exhaust Gas Oxygen (= O2S*)
-
EGR* = Exhaust Gas Recirculation
-
EGT = Exhaust Gas Temperature
-
EI* = Electronic Ignition
-
EOI = End of Injection
-
EPROM* = Erasable Programmable Read-Only Memory
-
EEPROM* = Electrically Erasable PROM
-
EST = Electronic Spark Timing
-
F/A = Fuel-Air Ratio
-
FEEPROM* = Flash EEPROM
-
FMEM = Failure Mode Effects Management. Alternative vehicle operation strategy
in the event of a system failure.
-
FT* = Fuel Trim. Generally seen with the words "long term" or "short
term".
-
HEGO = Heated EGO (sensor). (= HO2S*)
-
HO2S* = Heated Oxygen Sensor. Sensor has built-in heating element.
-
HEI = High Energy Ignition
-
IAC* = Idle Air Control. A motor controlled by the ECM. It
determines how much air gets through to the engine at idle. The computer
controls it to maintain a constant idle speed.
-
IAT* = Intake Air Temperature
-
IGBT = Insulated Gate Bipolar Transistor
-
INT = Integrator (= short term FT*)
-
ISC = Idle Speed Control (= IAC*)
-
KAM = Keep Alive Memory. Parameters stored in the ECM, can be lost if power
is removed.
-
KS* = Knock Sensor
-
MAF* = Mass Air Flow. The mass of air flowing into the intake is
directly measured via a hot wire, rotating vane, or hinged flap.
The computer reads this value and injects the proper amount of fuel.
-
MAP* = Manifold Absolute Pressure. The air pressure in the intake.
-
MAT = Manifold Air Temperature (= IAT*)
-
MCU = Microprocessor Control Unit (or Microcontroller Unit)
-
MIL* = Malfunction Indicator Lamp. "Check engine" light.
-
MFI* = Multiport Fuel Injection. One (or more) injectors per cylinder.
-
MPI = MultiPoint or MultiPort Fuel Injection (= MFI*)
-
O2S* = Oxygen Sensor
-
OBD* = On-Board Diagnostic. A system to monitor operation of the
emissions control system. SAE J1850 standardizes the communication protocols
and connectors for diagnostic tools
-
OEM = Original Equipment Manufacturer
-
OT = Injector On-Time (or Open Time)
-
PCM* = Powertrain Control Module. ECM with transmission control capability.
-
PE = Power Enrichment
-
PFI = Port Fuel Injection (= MFI*)
-
PIP = Profile Ignition Pickup (= CMP*)
-
PLCC = Plastic Leadless Chip Carrier
-
PWM = Pulse Width Modulated
-
SAE = Society of Automotive Engineers
-
SBC = Single Board Computer or Small Block Chevy
-
SD = Speed-Density. The amount of air entering the engine is calculated
from engine RPM, MAP, IAT, and an ECM-stored volumetric efficiency table
for the engine.
-
SFI* = Sequential multiport Fuel Injection. Fuel injection is timed with
respect to individual cylinder intake valve events.(=SEFI =SPFI)
-
SNAFU = Situation Normal - All F*ck'd Up
-
SOI = Start of Injection
-
SOL = Shit Out of Luck
-
SPI = Single Point Injection (=TBI*)
-
TBI* = Throttle Body Injection. One or more injectors located at the throttle
body, basically a more efficient carb.
-
TCC* = Torque Converter Clutch
-
TDC = Top Dead Center. Piston is at the top of the cylinder.
-
TPI = Tuned Port Intake. Resonance characteristics used to increase airflow.
-
TPS* = Throttle Position Sensor. Tells the ECM how "open" the throttle
is.
-
TWC* = Three Way Catalyst. Takes care of NOx, CO, and hydrcarbons.
-
UEGO = Universal Exhaust Gas Oxygen. Wide-range air-fuel ratio sensor.
-
ULEV = Ultra Low Emission Vehicle
-
VE = Volumetric Efficiency. Actual air mass ingested in a cylinder
divided by maximum possible (i.e. at atmospheric pressure).
-
VSS* = Vehicle Speed Sensor
-
VTEC = Variable valve Timing and lift Electronic Control
-
WOT* = Wide Open Throttle
-
greek letter phi (f) = F/A divided by the stoichiometric
F/A
-
greek letter lambda (l) = A/F divided by the
stoichiometric A/F
<Mark
Wilcutts> -- Last update 12/1/98