Modular design for fuel vapor purging in boosted engines
First Claim
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1. An engine method, comprising:
- during vacuum conditions, purging canister vapors into a converging side of a nozzle, out of a diverging side of the nozzle, and into an engine intake downstream of a throttle, the throttle downstream of a compressor; and
during boost, purging vapors from the canister into a zone between the converging side and a compressor inlet, the vapors not passing through the diverging side of the nozzle before entering the compressor inlet.
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Abstract
Methods and systems for fuel vapor canister purging in boosted engines are described. In one example, vapors are purged from the canister into an engine intake passage downstream of a throttle via an ejector during vacuum conditions, whereas during boost conditions, vapors are purged from the canister into an upstream inlet of a compressor via the ejector, the compressor arranged in the intake passage upstream of the throttle.
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Citations
20 Claims
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1. An engine method, comprising:
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during vacuum conditions, purging canister vapors into a converging side of a nozzle, out of a diverging side of the nozzle, and into an engine intake downstream of a throttle, the throttle downstream of a compressor; and during boost, purging vapors from the canister into a zone between the converging side and a compressor inlet, the vapors not passing through the diverging side of the nozzle before entering the compressor inlet. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A reverse purge system for a turbocharged engine, comprising:
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a nozzle and a first check valve arranged in a housing, the nozzle having a converging side and a diverging side an orifice formed at the converging side, and a zone disposed within the housing between the orifice and the first check valve; a first port of the housing coupled with an intake of the engine downstream of a throttle; a fuel vapor canister coupled with a second port of the housing; and an inlet of a compressor coupled with a third port of the housing. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A method for engine fuel vapor canister purging, comprising:
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opening a canister purge valve to flow vapors from the canister into a zone disposed in a housing via a second port of the housing; during vacuum conditions, drawing the vapors from the zone, into a converging side of a nozzle arranged in the housing, out of a diverging side of the nozzle, and into an engine intake passage downstream of a throttle via a first port of the housing; and during boost, creating a low pressure in the zone by drawing a fluid from the intake passage downstream of the throttle into the first port and through the nozzle from the diverging side to the converging side, the low pressure in the zone drawing vapors from the canister into the zone of the housing via the second port and then into an upstream inlet of a compressor arranged upstream of the throttle in the intake passage via a third port of the housing, where the vapors do not pass through the diverging side of the nozzle after entering the second port and before exiting the third port. - View Dependent Claims (17, 18, 19, 20)
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Specification