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Spark timing control system for internal combustion engine

  • US 4,376,428 A
  • Filed: 02/22/1980
  • Issued: 03/15/1983
  • Est. Priority Date: 02/23/1979
  • Status: Expired due to Term
First Claim
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1. Apparatus for controlling the occurrence times of discharges of a multi-cylinder internal combustion engine of an automotive vehicle having a transmission and sources for deriving signals indicative of:

  • (a) the engine being cranked or operating normally, (b) the transmission being in high or low gear, (c) engine speed, and (d) the values of parameters determining engine load, said apparatus comprising a computer responsive to the signals, said computer including;

    read only memory means having tables for storing signals with values indicative of spark advance and dwell angle as functions of engine load and engine speed for the engine being cranked, operating normally, the transmission being in high and low gear;

    said computer being responsive to the signals of the sources for selecting from the tables stored signals having values indicative of spark advance and dwell angle corresponding with the conditions indicated by signals (a), (b), (c) and (d); and

    a spark control circuit responsive to the signals having values indicative of spark advance and dwell angle for controlling the occurrence times of sparking of a spark plug for each cylinder of the engine.

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