Failure diagnosis apparatus for evaporative fuel processing...

Details Failure diagnosis apparatus for evaporative fuel processing... Failure diagnosis apparatus for evaporative fuel processing...

G - Physics

01

M

G01M 15/04 (2006.01) B60K 15/00 (2006.01) F02D 41/22 (2006.01) F02M 25/08 (2006.01) G01M 3/28 (2006.01)

Patent

CA 2536137

A failure diagnosis apparatus for diagnosing a failure of an evaporative fuel processing system. The system includes a fuel tank, a canister having adsorbent for adsorbing evaporative fuel generated in the fuel tank, an air passage connected to the canister for communicating the canister with the atmosphere, a first passage for connecting the canister and the fuel tank, a second passage for connecting the canister and an intake system of an internal combustion engine, and a purge control valve provided in the second passage. A pressure in the evaporative fuel processing system is detected. An opening of the purge control valve is controlled by changing a duty ratio of a drive signal which drives the purge control valve. First and second filterings of the detected pressure are performed. A second passing frequency band of the second filtering is narrower than a first passing frequency band of the first filtering. A flow rate abnormality of a purge gas flowing in the second passage is determined based on the filtered pressures.

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