SYSTEM AND METHOD FOR IMPROVING FUEL VAPOR PURGING FOR AN ENGINE HAVING A COMPRESSOR
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Abstract
A system and method for storing and purging fuel vapors for an internal combustion engine comprising a compressor is presented. The system allows the canister to be purged even while the engine is operated at high engine load.
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Citations
36 Claims
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1-22. -22. (canceled)
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23. A method for purging fuel vapors, comprising:
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directing a portion of output from a compressor to a fuel vapor canister, the compressor positioned in an engine intake; and controlling pressure in the intake manifold by adjusting a position of a throttle valve and a position of a vapor management valve to produce a desired flow rate from the fuel vapor canister to the intake manifold downstream of the throttle valve. - View Dependent Claims (24, 25, 26, 27)
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28. A method for storing and purging fuel vapors in a canister of an engine having a compressor, the method comprising:
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drawing fuel vapors from a fuel tank to a canister using intake manifold vacuum during a first condition; and applying a compressed intake positive air pressure to the canister to push fuel vapors from the canister into an intake manifold downstream of a throttle valve during a second condition by adjusting the throttle valve. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36)
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Specification