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Fuel tank vapor control system with means for warning of malfunction of canister

  • US 5,150,689 A
  • Filed: 09/12/1991
  • Issued: 09/29/1992
  • Est. Priority Date: 09/14/1990
  • Status: Expired due to Fees
First Claim
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1. A fuel tank vapor control system for an automotive vehicle comprising:

  • a fuel tank with hydrocarbon vapors;

    a canister for adsorbing the hydrocarbon vapors from said fuel tank;

    engine induction passage means;

    purge passage means for supplying the hydrocarbon vapors regenerating from said canister to said engine induction passage means;

    valve means for selectively opening and closing said purge passage means;

    temperature sensor means for detecting an inside temperature of said canister;

    judgement suspending means for suspending a judgement on malfunction of said canister when opening of said purge passage means is ineffective for causing an inside temperature fall of said canister, and once closing said purge passage means so that said canister fully adsorbs the hydrocarbon vapors; and

    malfunction judging means for judging that said canister is malfunctioning when opening of said purge passage means after said closing thereof by said malfunction suspending means is still ineffective for causing an inside temperature fall of said canister.

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