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Malfunction sensing apparatus for a fuel vapor control system

  • US 5,327,873 A
  • Filed: 08/25/1993
  • Issued: 07/12/1994
  • Est. Priority Date: 08/27/1992
  • Status: Expired due to Term
First Claim
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1. A malfunction sensing apparatus for a fuel vapor control system for an internal combustion engine comprising:

  • a source of fuel vapor;

    a canister containing an adsorbent for adsorbing fuel vapor and having an inlet connected to the source of fuel vapor and an outlet;

    a purge control valve connected to the outlet;

    a pressure sensor for sensing a pressure of the source of fuel vapor;

    malfunction sensing means responsive to the pressure sensor for sensing a malfunction when the purge control valve is open and the pressure sensed by the pressure sensor is above a prescribed value; and

    prohibiting means for sensing a rate of change of the pressure sensed by the pressure sensor with the purge control valve closed and prohibiting malfunction sensing by the malfunction sensing means when the rate of change of the pressure exceeds a prescribed rate.

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