Evaporative fuel-processing system for internal combustion engin

Details Evaporative fuel-processing system for internal combustion engin Evaporative fuel-processing system for internal combustion engin

1997-04-24

1998-05-05

Argenbright, Tony M.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

123198D, 123520, 123698, F02M 2508, F02D 4114

Patent

active

057461910

ABSTRACT:
An evaporative fuel-processing system for an internal combustion engine is comprised of an evaporative emission control system including a canister, a charging passage extending between the canister and the fuel tank, a purging passage extending between the canister and the intake system of the engine, a purge control valve, and a vent shut valve. A pressure sensor detects the pressure within the evaporative emission control system. The interior of the evaporative emission control system is negatively pressurized into a predetermined negatively pressurized state, by opening the purge control valve and closing the vent shut valve. Then, the purge control valve is closed, and leakage from the evaporative emission control system is checked based on the rate of decrease in negative pressure within the evaporative emission control system over a first predetermined time period. An amount of evaporative fuel supplied from the canister to the engine is detected, and when the detected amount of evaporative fuel exceeds a predetermined amount, the abnormality determination of the evaporative emission control system is terminated. The predetermined amount is changed in a direction of mitigating conditions for the abnormality determination over a second predetermined time period after starting of the engine in a cold state.

REFERENCES:
patent: 5295472 (1994-03-01), Otsuka et al.
patent: 5355863 (1994-10-01), Yamanaka et al.
patent: 5614665 (1997-03-01), Curran et al.

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