Method for diagnosing leakage of fuel vapor purge system
AssigneesHyundai Motor Company, Kia Motors Corporation
InventorChoo Saeng Choi
Life of this patent
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Abstract
A method for diagnosing leakage of a fuel vapor dual purge system is provided. The method includes determining whether an operation region of a vehicle is an operation region in which a turbocharger is operated and adjusting a flow amount of intake air flowing into the turbocharger according to an operation region in which the turbocharger is operated. A hydrocarbon collecting amount of a canister connecting fuel vapor generated in the fuel tank is calculated and a flow amount of the fuel vapor passing first and second purge lines is adjusted. A leak of the fuel vapor is diagnosed in the first purge line and the second purge line.
Claims14
A method for diagnosing leakage of a fuel vapor dual purge system including a first purge line connected from a fuel tank to an intake side of an engine and a second purge line connected from the fuel tank to the intake side via a turbocharger, comprising:
- determining, by a controller, whether an operation region of a vehicle is an operation region in which the turbocharger is operated;
- adjusting, by the controller, a flow amount of intake air flowing into the turbocharger according to an operation region in which the turbocharger is operated;
- calculating, by the controller, a hydrocarbon collecting amount of a canister connecting fuel vapor generated in the fuel tank;
- adjusting, by the controller, a flow amount of the fuel vapor passing first and second purge lines;
- and
- determining, by the controller, whether a leak of the fuel vapor is generated in the first purge line and the second purge line.
A leakage diagnosis system, comprising:
- a first purge line connected from a fuel tank to an intake side of an engine and a second purge line connected from the fuel tank to the intake side via a turbocharger;
- a main purge line connected to the fuel tank;
- a first auxiliary purge line and a second auxiliary purge line branched from the main purge line, wherein the first purge line is formed by the main purge line and the first auxiliary purge line and the second purge line is formed by the main purge line and the second auxiliary purge line;
- a controller configured to:
- determine whether an operation region of a vehicle is an operation region in which the turbocharger is operated;
- adjust a flow amount of intake air flowing into the turbocharger according to an operation region in which the turbocharger is operated;
- calculate a hydrocarbon collecting amount of a canister connecting fuel vapor generated in the fuel tank;
- adjust a flow amount of the fuel vapor passing first and second purge lines;
- and
- determine whether a leak of the fuel vapor is generated in the first purge line and the second purge line.
Dependencies are inferred from the claim text.