Evaporative emission control system and method

Details Evaporative emission control system and method Evaporative emission control system and method

2005-08-23

2005-08-23

Argenbright, Tony M. (Department: 3747)

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

C073S118040, C123S520000, C123S690000, C123S698000

Reexamination Certificate

active

06932068

ABSTRACT:
An evaporative emission control system includes a canister for collecting fuel vapor from a fuel tank, and a purge control valve disposed between the canister and the intake passage of the engine. A controller of the system determines a failure of the purge control valve, executes a purging process by opening the purge control valve, executes a learning process for learning the fuel concentration of the purge gas, and executes a correcting process for correcting the amount of fuel injected into the engine based on the learned value of the fuel concentration. When the purge control valve is normal and conditions for execution of purge control are satisfied, the controller requests execution of the purging process, learning process and the correcting process. When an open failure occurs in the purge control valve, the controller always requests execution of the learning process and the correcting process.

REFERENCES:
patent: 5295472 (1994-03-01), Otsuka et al.
patent: 5964811 (1999-10-01), Ishii et al.
patent: A 5-180101 (1993-07-01), None
patent: A 6-58197 (1994-03-01), None
patent: A 11-141413 (1999-05-01), None

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