Basic Concepts
Library.BasicConcepts · r1.3 · · markolson
Vocab:
- ECU = Engine Control Unit
- OBD0 = the first unofficial generation of honda engine electronics
- OBD1 = the second unofficial generation of honda engine electronics
- OBD2 = the first official standard for engine electronics
- EDM = European Domestic Market
- JDM = Japanese Domestic Market
- USDM = United States Domestic Market
- Check Sum = what is a checksum? What kind of checksums do honda ECUs use?
- Manual Checksum = how do I fix a checksum by hand?
- Bin File = what is a bin file?
- Hex File = what is a hex file?
- Hex2 Bin = how to convert hex files to bin files
- Pulse Width Modulation = PWM which is frequently used to do DAC
- DAC = Digital to Analog Conversion
- ADC = Analog to Digital Conversion
- RPM = Revolutions Per Minute = how fast the motor is spinning
- Ecu Sensors = Sensors that the ECU monitors in order to run the motor properly.
- Pre Ignition = "knocking" or "detonation" - destructive combustion of fuel without a spark
- Atmospheric Pressure = the pressure of air around you
- Boost = Pressure greater than atmospheric pressure
- Absolute Pressure = pressure measured on a scale where Absolute Vacuum = 0
- Absolute Vacuum = the state where there are no gas molecules present
- Air Fuel Ratio = ratio between air and fuel entering engine. critical
- IAB = Intake Air Bypass
Devices/Hardware:
- ECU = Engine Control Unit
- Ecu Sensors let the ECU interact with the world.
- Rom Burner programs chips
- Rom Emulator a device that "looks" like a ROM but allows changes in realtime
- Engine Simulator A workbench ECU testing and tuning device. (Work in Progress.)
- Boost Controller = device to adjust boost pressure levels
- Waste Gate = device to limit boost with a turbocharger
- Exhaust Gas Temp Sensor = ''EGT'' - measures the temperature of exhaust gases
- Wide Band O2 = ''wideband'' - a device to measure a (relatively) broad range of Air Fuel Ratios
Stock ECU Code Features
- Dual Tables = fuel and timing mapping for two separated states on the same ROM. Used with Vtec motors.
- Rev Limiter = limits engine rotation to a safe RPM
- Speed Limiter = limits a vehicles top speed
- Data Logging = most ECUs have some provision for datalogging in the factory code.
- ECU-Code Compatibility = Most ECUs can run a wide variety of programs other than the one from the factory
PGMFI-Hacked Features/Code (duplicates indicate modifications)
- Dual Tables = added to non-Vtec ECU code to run a Vtec motor properly, and as part of ECUNitrous Control
- Add Boost = What does Crome ROMEditor or Uber Data ERM do to make the ECU understand boost?
- ECUBoost Controller = What is the Boost Controller portion of Uber Data ERM and how does it work?
- ECUNitrous Control = Code for the ECU to turn a nitrous solenoid on/off (and also implement Dual Tables and other stuff.)
- Data Logging = often, code mods are needed for solid datalogging.
- Launch Control = a "two-step" revlimiter - low revlimit while stationary for consistent launches
- Full Throttle Shift = For ricer glitz full-throttle shifting w/o grenading your motor
- NGxx (i.e. NG60) = A very modified PM6 file (firmware) with boost capability among other things.
Physics, Thermodynamics, Engine Management Theory
- Ideal Gas Law = equation explaining relationship between gas properties
- Speed Density = the type of engine management philosophy used in Honda ECUs.
- Volumetric Efficiency = the efficiency of an engine at pumping air in a given state
- Mass Air Flow = A type of engine management system that directly measures air entering the motor. Not typically found on Hondas, but common on other manufacturers.