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Abnormality detecting apparatus for use in fuel transpiration prevention systems

  • US 5,317,909 A
  • Filed: 04/02/1992
  • Issued: 06/07/1994
  • Est. Priority Date: 04/02/1991
  • Status: Expired due to Term
First Claim
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1. A fuel transpiration prevention system for preventing transpiration of a fuel gas generated by fuel encased within a liquid fuel tank and supplied to an internal combustion engine, said apparatus comprising:

  • a fuel gas supply system including;

    canister means encasing an absorbing device for absorbing said fuel gas generated within said fuel tank;

    first passage means provided between said canister means and said fuel tank for introducing said fuel gas from said fuel tank to said canister means;

    second passage means provided between said canister and an intake pipe of said internal combustion engine for leading the fuel gas absorbed by said absorbing device into said intake pipe of said internal combustion engine due to a negative pressure generated within said intake pipe;

    valve means provided in said second passage means for opening and closing said second passage in accordance with an operating condition of said internal combustion engine;

    pressure detecting means for detecting a pressure within said fuel tank and generating a signal indicative of the detected pressure;

    deviation calculating means responsive to said signal generated from said pressure detecting means for calculating a deviation between the pressure detected when said valve means opens said second passage means and the pressure detected when said valve means closes said second passage means; and

    abnormality decision means for deciding an abnormality of said fuel gas supply system on the basis of said deviation calculated by said deviation calculating means.

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