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Fuel vapor system diagnostic systems and methods

  • US 10,197,017 B2
  • Filed: 08/30/2016
  • Issued: 02/05/2019
  • Est. Priority Date: 12/01/2015
  • Status: Active Grant
First Claim
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1. A fuel vapor system for a vehicle, comprising:

  • a fuel vapor canister that traps fuel vapor from a fuel tank of the vehicle;

    a purge valve that opens to allow fuel vapor flow to an intake system of an engine and that closes to prevent fuel vapor flow to the intake system of the engine;

    an electrical pump that pumps fuel vapor from the fuel vapor canister to the purge valve; and

    a diagnostic module that (a) selectively diagnoses a fault in the fuel vapor system based on a pressure at a location between the electrical pump and the purge valve, and that (b) illuminates a malfunction indicator lamp (MIL) within a passenger cabin of the vehicle when the fault is diagnosed,wherein the diagnostic module;

    selectively closes the purge valve when the electrical pump is on; and

    diagnoses the fault based on an average of values of the pressure at the location between the electrical pump and the purge valve taken after the closing of the purge valve.

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