SYSTEMS AND METHODS FOR FUEL VAPOR CANISTER PURGING
First Claim
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1. A method for a boosted engine, comprising:
- during purging a fuel vapor canister,during a boosted condition, flowing compressed air from a first intake passage downstream of a compressor into the canister, and delivering purge gases from the canister to a second intake passage upstream of the compressor; and
during a non-boosted condition, flowing un-compressed air from the first intake passage into the canister, and delivering the purge gases to an engine intake manifold.
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Abstract
Methods and systems are provided for purging a fuel vapor canister. In one example, a method may include during boosted engine operating conditions, utilizing regulated compressed air from an engine intake to purge fuel vapors stored in the fuel vapor canister. Further, during non-boosted condition, regulated air from the intake may be utilized to purge the fuel vapor canister. The purged fuel vapors and intake air may be delivered to upstream of a compressor when operating with boost, or to an intake manifold when operating without boost.
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Citations
20 Claims
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1. A method for a boosted engine, comprising:
during purging a fuel vapor canister, during a boosted condition, flowing compressed air from a first intake passage downstream of a compressor into the canister, and delivering purge gases from the canister to a second intake passage upstream of the compressor; and during a non-boosted condition, flowing un-compressed air from the first intake passage into the canister, and delivering the purge gases to an engine intake manifold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for a boosted engine, comprising:
during purging a fuel vapor canister, opening a canister purge valve located within a first purge conduit, the first conduit coupled to an outlet port of the canister; regulating air flow from a first intake passage of the engine downstream of a compressor and upstream of an intake throttle into the canister; flowing purge gases from the outlet port of the canister to a junction downstream of the purge valve via the first purge conduit; during a first condition, directing the purge gas flow at the junction to a second intake passage upstream of compressor; and during a second condition, directing the purge gas flow at the junction to an engine intake manifold. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A vehicle system, comprising:
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a boosted engine; a fuel tank; a fuel vapor canister; an inlet line coupling a first intake passage downstream of a compressor of the engine and upstream of an intake throttle to an inlet port of the canister; a first purge conduit coupling an outlet port of the canister to a node; a canister purge valve coupled within the first purge conduit; a second purge conduit coupling the node to an intake manifold; a third purge conduit coupling the node to a second intake passage upstream of the compressor; a vent line coupling the outlet port of the canister to ambient air; a canister vent valve coupled within the vent line; and a controller having executable instructions stored in a non-transitory memory for; when canister purge conditions are met, during a boosted condition, drawing compressed air through the canister from the first intake passage via the inlet line, and flowing purge gases to the second intake passage via the first purge conduit and the third purge conduit; and during a non-boosted condition, drawing intake air through the canister from the first intake passage via the inlet line, and flowing purge gases to the intake manifold via the first purge conduit and the second purge conduit. - View Dependent Claims (19, 20)
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Specification