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Control apparatus of an internal combustion engine

  • US 4,913,117 A
  • Filed: 07/28/1988
  • Issued: 04/03/1990
  • Est. Priority Date: 08/05/1987
  • Status: Expired due to Term
First Claim
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1. A control apparatus of an internal combustion engine which has air-fuel ratio control means for controlling the operation of an air-fuel ratio adjusting device for adjusting the air-fuel ratio of an air-fuel mixture to be supplied to the engine, and ignition timing control means for controlling the operation of an ignition device for igniting the air-fuel mixture supplied to the engine, comprising:

  • knock detecting means for detecting a knocking state of the engine, said knock detecting means delivering a knock signal corresponding to the detected knocking state when the knocking state is detected thereby; and

    correction data calculating means for calculating a value of first correction data tending to change to a high degree, thereby preventing said knocking state, and a value of second correction data tending to change to a low degree, thereby preventing said knocking state, in response to said knock signal delivered from said knock detecting means;

    the value of said first correction data being calculated so as to change in a first direction when said knock signal is delivered, and to change in a second direction opposite to said first direction when said knock signal is not delivered;

    the value of said second correction data being calculated so as to change in a third direction when the value of said first correction data changes in said first direction to get beyond a preset value or range, and to change in a fourth direction opposite to said third direction when the value of said first correction data changes in said second direction;

    said ignition timing control means including means for setting the ignition timing on the delay side when the value of said first correction data changes in said first direction, for setting the ignition timing on the advance side when the value of said first correction data changes in said second direction, for setting the ignition timing on the delay side when the value of said second correction data changes in said third direction, and for setting the ignition timing on the advance side when the value of said second correction data changes in said fourth direction; and

    said air-fuel ratio control means including means for adjusting the air-fuel ratio to a value on the fuel-rich side when the value of said first correction data changes in said first direction, and for adjusting the air-fuel ratio to a value on the fuel-lean side when the value of said first correction data changes in said second direction.

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