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Air-fuel ratio control system for internal combustion engines

  • US 5,526,798 A
  • Filed: 03/16/1995
  • Issued: 06/18/1996
  • Est. Priority Date: 03/18/1994
  • Status: Expired due to Term
First Claim
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1. An air-fuel ratio control system for an internal combustion engine having an exhaust system, comprising:

  • exhaust gas component concentration-detecting means arranged in said exhaust system of said engine, for detecting concentration of a specific component present in exhaust gases emitted from said engine;

    air-fuel ratio control means for controlling an air-fuel ratio of an air-fuel mixture to be supplied to said engine, in response to a difference between an output value from said exhaust gas component concentration-detecting means and a predetermined reference value;

    deterioration-detecting means for detecting deterioration of said exhaust gas component concentration-detecting means, based on said output value from said exhaust gas component concentration-detecting means;

    display signal-output means for outputting a deterioration display signal when deterioration of said exhaust gas component concentration-detecting means is detected by said deterioration-detecting means; and

    control means for determining whether execution of said air-fuel ratio control means is to be inhibited or to be continued, based on a deterioration degree of said exhaust gas component concentration-detecting means when deterioration of said exhaust gas component concentration-detecting means is detected by said deterioration-detecting means.

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