System and method for improving fuel vapor purging for an engine having a compressor
First Claim
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1. A method for purging fuel vapors, comprising:
- 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.
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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
14 Claims
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1. 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 (2, 3)
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4. 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 vapor management valve, and adjusting an outlet pressure of the compressor, to produce a desired flow rate from the fuel vapor canister to the intake manifold downstream of the throttle valve. - View Dependent Claims (5)
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6. 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, at a desired flow rate, from the canister into an intake manifold downstream of a throttle valve during a second condition by adjusting the throttle valve. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14)
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Specification