Method for diagnosing fault within a fuel vapor system
AssigneeFord Global Technologies, LLC
InventorsDENNIS SEUNG-MAN YANG, AED M. DUDAR
Life of this patent
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Abstract
A method for diagnosing a fault within a evaporative emission control system of an automotive vehicle. The method monitors the carbon canister temperature during a system leak test. The leak test here is undertaken with the engine running, and engine vacuum is employed to evacuate the EVAP system. If the evacuation succeeds in reaching a target vacuum, and a temperature gain in the canister is observed, then the system infers proper system operation. Failure to achieve a target vacuum causes the system to determine a likely cause of the failure based on the temperature response of the carbon canister.
Claims8
A method for diagnosing a fault in an evaporative emission control system, comprising:
- during a system leak test, monitoring carbon canister temperature;
- upon identifying a failure to achieve a target vacuum during a leak test, determining the carbon canister temperature change during the test;
- and
- inferring a likely cause of the failure based on a comparison of the temperature change and predetermined data.
Dependencies are inferred from the claim text.