Method for purging fuel vapors to an engine
First Claim
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1. A method for purging fuel vapors, comprising:
- supplying fuel vapors to an engine via a storage canister including activated carbon and a purge valve positioned between the engine and the storage canister; and
limiting an engine intake valve timing to a timing not exceeding a timing where a sonic flow occurs between the storage canister and the engine in response to a concentration of hydrocarbons flowing from the storage canister to the engine.
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Abstract
A method for improving purging of fuel vapors from a fuel vapor storage canister to an engine is presented. In one example, the method adjusts engine operation to provide sonic flow between a canister and the engine. In this way, it may be possible to lower an amount of fuel vapors stored in a canister while the engine continues to operate efficiently.
25 Citations
20 Claims
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1. A method for purging fuel vapors, comprising:
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supplying fuel vapors to an engine via a storage canister including activated carbon and a purge valve positioned between the engine and the storage canister; and limiting an engine intake valve timing to a timing not exceeding a timing where a sonic flow occurs between the storage canister and the engine in response to a concentration of hydrocarbons flowing from the storage canister to the engine. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for purging fuel vapors, comprising:
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supplying fuel vapors to an engine via a storage canister including activated carbon and a purge valve positioned between the engine and the storage canister; and limiting operation of a device to provide a sonic velocity of a gas between the storage canister and the engine in response to a hydrocarbon concentration in the storage canister, operation of the device adjusted to not exceed where sonic velocity is achieved between the storage canister and the engine. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method for purging fuel vapors, comprising:
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operating an engine at a first volumetric efficiency at a first engine speed and torque output while purging fuel vapors stored in a canister including activated carbon to the engine in response to a first concentration of hydrocarbon vapors flowing from the canister including activated carbon to the engine; and operating the engine at a second volumetric efficiency at the first engine speed and torque output while purging fuel vapors stored in the canister including activated carbon to the engine in response to a second concentration of hydrocarbon vapors flowing from the canister including activated carbon to the engine. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification