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Air-fuel ratio control system for internal combustion engines

  • US 5,724,808 A
  • Filed: 04/26/1996
  • Issued: 03/10/1998
  • Est. Priority Date: 04/26/1995
  • Status: Expired due to Term
First Claim
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1. In an air-fuel ratio control system for an internal combustion engine including an exhaust passage, and a catalyst arranged in said exhaust passage for purifying exhaust gases emitted from said engine, said air-fuel ratio control system including first air-fuel ratio-detecting means arranged at a location upstream of said catalyst for detecting concentration of a particular component of said exhaust gases, and air-fuel ratio control means for controlling an air-fuel ratio of a mixture supplied to said engine in response to an output from said first air-fuel ratio-detecting means,the improvement comprising:

  • sulfur poisoning-detecting means for detecting deterioration of said catalyst caused by sulfur poisoning; and

    control parameter-changing means for changing a control parameter for use in controlling an operation of said engine when said deterioration of said catalyst caused by sulfur poisoning is detected.

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