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US 7,743,752 B2Granted
System and method for improving fuel vapor purging for an engine having a compressor
AssigneeFord Global Technologies, LLC
InventorsJames Michael Kerns, Ralph Wayne Cunningham, Thomas G. Leone, Gopichandra Surnilla, Ross Dykstra Pursifull
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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.
Claims21
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.
3 more elements
A method for purging fuel vapors, comprising:
- 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.
A method for storing and purging fuel vapors in a canister of an engine having a compressor, the method comprising:
- 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.
Dependencies are inferred from the claim text.