Microcomputer IC engine timing controller based on acceleration - holds successive values of engine speed for calculation of acceleration to access look up tables to provide firing angle

摘要

The appts. uses a microcomputer which monitors engine speed and holds successive values of speed for use in determining the acceleration of the engine. The computed value of acceleration is used to access the appropriate one of six ignition angle versus engine speed curves held as look-up tables in the computer memory. The value returned from the look up table is used to time the ignition firing angle. The microcomputer is conventionally configured with an Arithmetic and Logic Unit accepting a timing signal from a crankshaft transducer (11). A clock (26) times the micro-computer. The microcomputer programme operation is held in a ROM, and registers hold the immediately preceding speed values.