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Ignition timing control system for automotive engine

  • US 4,996,959 A
  • Filed: 06/28/1989
  • Issued: 03/05/1991
  • Est. Priority Date: 07/13/1988
  • Status: Expired due to Fees
First Claim
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1. A system for controlling the ignition timing of an engine having a computer for periodically performing a program and engine speed calculator means for calculating engine speed and for producing an engine speed signal, comprising:

  • air calculator means for calculating a quantity of intake air passing a throttle valve of the engine per revolution of the engine and for producing an air quantity signal;

    weight providing means responsive to the engine speed signal for producing a weight for a weighted average;

    load data calculator means for adding a last engine load data at a last program and a quotient calculated by dividing the difference between the air quantity signal and the last engine load data by a present weight provided at a present program and for producing present engine load data at the present program;

    memory means storing a plurality of ignition timings arranged in accordance with present engine load data and the present engine speed; and

    deriving means for deriving an ignition timing in accordance with a present engine load data obtained by the load data calculation means and a present engine speed signal obtained by the engine speed calculator.

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