Vapor purge system integrity diagnosis for a hybrid vehicle
First Claim
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1. A method to test a vapor purge system (VPS) for a vehicle having an internal combustion engine, the method comprising:
- detecting a command to shut down the vehicle;
closing a first valve coupled between a carbon canister of the VPS and atmosphere;
motoring the engine to pull a vacuum on the VPS;
closing a second valve coupled between the carbon canister and the engine; and
monitoring pressure in the VPS.
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Abstract
A method for testing a vapor purge system (VPS) for an internal combustion engine, and a hybrid vehicle having the VPS include a controller for closing a first valve coupled between a carbon canister of the VPS and the ambient environment, motoring the engine to pull a vacuum on the VPS, closing a second valve coupled between the carbon canister and the engine, and monitoring pressure in the VPS. The VPS has a carbon canister coupled to the engine via a first valve and coupled to atmosphere via a second valve, and a pressure transducer.
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Citations
18 Claims
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1. A method to test a vapor purge system (VPS) for a vehicle having an internal combustion engine, the method comprising:
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detecting a command to shut down the vehicle; closing a first valve coupled between a carbon canister of the VPS and atmosphere; motoring the engine to pull a vacuum on the VPS; closing a second valve coupled between the carbon canister and the engine; and monitoring pressure in the VPS. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A hybrid electric vehicle (HEV) comprising:
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an engine; a vapor purge system (VPS) with a carbon canister coupled to the atmosphere via a first valve and coupled to the engine via a second valve, and a pressure transducer; and a controller configured to;
(i) close the first valve, (ii) motor the engine to pull a vacuum in the VPS, (iii) close the second valve, and (iv) monitor the pressure transducer to monitor pressure in the VPS;wherein the controller controls the first and second valves and motors the engine in response to a HEV shutdown command. - View Dependent Claims (11, 12, 13, 14)
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15. A method to test a vapor purge system (VPS) onboard a vehicle having an engine, the method comprising:
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detecting a vehicle shutdown event; closing a first valve coupling a carbon canister of the VPS and atmosphere; measuring pressure in the VPS; motoring the engine to decrease the pressure in the VPS when the pressure is above a threshold; closing a second valve coupled between the carbon canister and the engine when the pressure in the VPS is below the threshold; and monitoring the pressure in the VPS to test for system integrity in the VPS. - View Dependent Claims (16, 17, 18)
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Specification