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Self-diagnosable fuel-purging system used for fuel processing system

  • US 5,099,439 A
  • Filed: 06/22/1990
  • Issued: 03/24/1992
  • Est. Priority Date: 06/26/1989
  • Status: Expired due to Fees
First Claim
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1. A diagnosing system for a fuel-purging system used for a fuel processing system, said fuel purging system causing a fuel to be introduced from a fuel tank into a canister packed with an absorbent for absorbing the fuel thereon, and causing the fuel absorbed onto the absorbent to be introduced into an engine, said diagnosing system comprising:

  • first detecting means for detecting a fuel purging condition in which the fuel absorbed onto the absorbent of the canister is supplied to the engine, to produce a first signal representative of the fuel purging condition;

    second detecting means for monitoring an air/fuel ratio in an exhaust gas from the engine to produce a second signal representative of the air/fuel ratio;

    third detecting means for monitoring temperature in the canister to produce a third signal representative of the temperature in the canister; and

    discriminating means for determining abnormality of the fuel-purging system on the basis of the second and third signal values when the fuel-purging condition is detected.

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