Patent Number: 6,253,744

Title: Method and apparatus for controlling fuel vapor, method and apparatus for diagnosing fuel vapor control apparatus, and method and apparatus for controlling air-fuel ratio

Abstract: Purge control valves are mounted to purge pipings arranged in parallel for supplying purge gas from a canister to an engine. A flow rate of the purge control valve having a larger flow rate size is controlled in a step mode, and a flow rate equal to or smaller than a variation quantity in said step mode is controlled by the purge control valve having a smaller flow rate size.

Inventors: Saruwatari; Masayuki (Atsugi, JP), Furuya; Junichi (Atsugi, JP)

Assignee: Unisia Jecs Corporation

International Classification: F02D 41/00 (20060101); F02M 25/08 (20060101); F02M 033/02 ()

Expiration Date: 07/03/2018