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Method and apparatus for evaporative emissions control

  • US 8,869,777 B2
  • Filed: 05/29/2013
  • Issued: 10/28/2014
  • Est. Priority Date: 11/03/2010
  • Status: Active Grant
First Claim
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1. A method of diagnosing failure of a fuel inlet access door condition sensor and preventing pressurization of a fuel tank of a vehicle after a refueling event, comprising:

  • detecting that the sensor has not changed from a door closed to a door open indication;

    detecting that a fuel level inside the fuel tank has increased by more than a threshold amount;

    detecting that a vehicle engine has been restarted; and

    in response to the above conditions, inferring a failure of the sensor and preventing closing an isolation valve that, when closed, isolates the fuel tank from a vapor recovery canister.

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