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Self-diagnosis system for auxiliary air control system of internal combustion engine

  • US 4,875,456 A
  • Filed: 02/08/1989
  • Issued: 10/24/1989
  • Est. Priority Date: 02/08/1989
  • Status: Expired due to Term
First Claim
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1. A self-diagnosis system for an auxiliary air control system of an internal combustion engine having an auxiliary air control valve, provided in an auxiliary air passage which bypasses a throttle valve of an air intake system of said engine, for controlling the amount of air inducted through said auxiliary air passage, comprising:

  • first means for detecting the amount of air inducted through a main air intake passage of said engine;

    second means comparing the amount of air detected by said first means while said throttle valve is fully closed with a value calculated according to the opening angle command signal for said auxiliary air control valve, said second means judging that said auxiliary air control system is malfunctioning if said intake air amount detected by said first means is larger than said calculated value.

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