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Control system for internal combustion engine

  • US 6,505,464 B1
  • Filed: 11/09/2000
  • Issued: 01/14/2003
  • Est. Priority Date: 11/09/1999
  • Status: Expired due to Fees
First Claim
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1. A control system for internal combusting engine having an exhaust system provided with a catalyst, said control system comprising:

  • intake air amount control means for controlling an intake air amount to said engine;

    ignition timing control means for controlling an ignition timing of said engine;

    catalyst temperature raising means for increasing the intake air amount after starting of said engine and for retarding the ignition timing according to a rotational speed of said engine; and

    failure diagnosing means for diagnosing a failure of said catalyst temperature raising means during the operation of said catalyst temperature raising means, wherein failure diagnosing means diagnoses said failure of said catalyst temperature raising means according to an amount of change in said ignition timing during the operation of said catalyst temperature raising means.

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