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Engine Managment
Computer Terms
Term | Definition |
---|---|
ROM | Read Only Memory - once programmed it cannot be written to again |
KAM | Keep Alive Memory - it loses its data when disconnected from the battery for a length of time |
RAM | Random Access Memory - it loses its data when the car is turned off |
PROM | Programmable ROM - programmed once by the user |
EPROM | Erasable PROM - uses Ultraviolet (UV) light to erase |
EEPROM | Electronically Erasable PROM - aka Flash memory |
Short term memory | Memory which loses data when power is removed |
Long term memory | Memory which retains data even when all power is removed |
Volatile | Memory that lasts only while the power is on (and thus would be lost after a restart) |
RAM data | It is a scratch pad memory that holds temporary real-world data that may or may not be processed |
KAM data | DTC's, clock, customer preferences (radio stations, seat positions, etc.) |
ROM data | vehicle information like engine size and lookup tables of general parameters |
Input | An electrical signal going to a computer for processing |
Output | Information in a form suitable for transmission from a computer |
Processing | Converting a signal in to a usable form |
Sensor | A component that measures a physical quantity and sends its output to a computer |
Actuator | A computer-controlled component that changes electrical energy into an action |
Microprocessor | A part of the computer that makes decision and performs calculations |
Multiplexing | A system that has many inputs sharing one communications line |
Demultiplexing | A system that uses one communications line to control many devices |
PROM data | Fine-tuned ROM data such as vehicle weight and drivetrain and includes calibrations tables |