Method for purging fuel vapors to an engine

摘要

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.

主权项

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.