Internal-combustion engines – Charge forming device – Having fuel vapor recovery and storage system
Patent
1998-05-20
2000-03-21
Moulis, Thomas N.
Internal-combustion engines
Charge forming device
Having fuel vapor recovery and storage system
123698, F02M 3704
Patent
active
060390328
ABSTRACT:
An air/fuel ratio controller for an internal combustion engine that obtains stabilized air-fuel ratio controllability even when an air-fuel ratio is changed during purge execution. In purge control to discharge fuel vapor adsorbed in a canister to an intake-air side of an internal combustion engine, the controller controls a purge ratio, by controlling operation of the purge solenoid valve, even when an air-fuel ratio is changed. A fuel-injection quantity from an injector is then compensated in correspondence thereto. Thus, stabilized air-fuel ratio controllability can be obtained by correction with a fuel-injection quantity, or purge correction by a control duty of the purge solenoid valve as a purge control parameter, even when an air-fuel ratio .lambda. is changed during purge execution, taking a predetermined ratio as the purge ratio.
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Miwa Makoto
Morikawa Junya
Denso Corporation
Moulis Thomas N.
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