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Apparatus for detecting misfire and for controlling fuel injection

  • US 4,928,228 A
  • Filed: 05/20/1988
  • Issued: 05/22/1990
  • Est. Priority Date: 05/26/1987
  • Status: Expired due to Term
First Claim
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1. An engine control apparatus which comprises, in combination:

  • a cylinder discrimination sensor for generating cylinder discriminating signal;

    a crank angle sensor for generating crank angle signal;

    a fuel injection valve provided in each cylinder of the engine;

    a plurality of ignition coils with each and every cylinder being connected to one of said coils;

    misfire detection means for detecting a state of misfire due to a lack of an ignition signal from any of said coils in accordance with signals received from said ignition coils, said misfire detection means producing a misfire detection signal which alternately changes between two levels in response to ignition signals during normal operation and which fails to change if a misfire is detected;

    an engine control section for controlling said fuel injection valves and said ignition coils in correspondence to the detected misfire upon receipt of the cylinder discrimination signal and the crank angle signal, and for not actuating the fuel injection valve of the misfired cylinder in response to the cylinder discrimination signal upon receipt of the misfire detection signal; and

    an OR circuit connected to said ignition coils to detect a misfire state due to a lack of an ignition signal, said OR circuit having an output connected to an input of said misfire detection means.

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