SYSTEM AND METHOD FOR IMPROVING FUEL VAPOR PURGING FOR AN ENGINE HAVING A COMPRESSOR
First Claim
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1. A system for purging a vehicle'"'"'s fuel vapor storage canister, the system comprising:
- an internal combustion engine;
a throttle for regulating air flow to the internal combustion engine;
a compressor located upstream from the throttle in the engine'"'"'s intake system; and
a fuel vapor canister that is in communication with an engine'"'"'s intake system at a first location that is downstream from the compressor, and the fuel vapor canister also in communication with the engine'"'"'s intake system at a second location that is downstream from the throttle.
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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
22 Claims
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1. A system for purging a vehicle'"'"'s fuel vapor storage canister, the system comprising:
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an internal combustion engine; a throttle for regulating air flow to the internal combustion engine; a compressor located upstream from the throttle in the engine'"'"'s intake system; and a fuel vapor canister that is in communication with an engine'"'"'s intake system at a first location that is downstream from the compressor, and the fuel vapor canister also in communication with the engine'"'"'s intake system at a second location that is downstream from the throttle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 12)
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9. A method for purging fuel vapors from a canister to an internal combustion engine having a compressor, the method comprising:
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directing a portion of a compressor'"'"'s output to a fuel vapor canister, the compressor in communication with an internal combustion engine'"'"'s intake manifold; and controlling pressure in the internal combustion engine'"'"'s intake manifold by adjusting the position of a throttle and the flow rate from the fuel vapor canister to the intake manifold. - View Dependent Claims (10, 11, 13)
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14. A method for storing and purging fuel vapors in a canister of an internal combustion 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 positive air pressure to the canister to push fuel vapors from the canister into an intake manifold during a second condition. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22)
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Specification