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 valve for regulating air flow to the internal combustion engine;
a compressor located upstream from the throttle valve in an intake system of said internal combustion engine;
a fuel vapor canister that is in communication with said intake system at a first location that is downstream from the compressor, and the fuel vapor canister also in communication with said intake system at a second location that is downstream from the throttle valve; and
a controller that adjusts a position of a valve to produce a desired canister flow rate at a pressure ratio across the valve.
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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.
49 Citations
21 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 valve for regulating air flow to the internal combustion engine; a compressor located upstream from the throttle valve in an intake system of said internal combustion engine; a fuel vapor canister that is in communication with said intake system at a first location that is downstream from the compressor, and the fuel vapor canister also in communication with said intake system at a second location that is downstream from the throttle valve; and a controller that adjusts a position of a valve to produce a desired canister flow rate at a pressure ratio across the valve. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. 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 in communication with an intake manifold of an engine; 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. - View Dependent Claims (9, 10, 11, 12)
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13. 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 positive air pressure to the canister to push fuel vapors from the canister into an intake manifold during a second condition, said positive air pressure controlled by adjusting at least one of a throttle valve, a surge valve, or a compressor output. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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Specification