Internal-combustion engines – Charge forming device – Including exhaust gas condition responsive means
Patent
1997-01-17
1998-07-14
Argenbright, Tony M.
Internal-combustion engines
Charge forming device
Including exhaust gas condition responsive means
123520, F02M 2508
Patent
active
057788677
ABSTRACT:
An object of the present invention is to improve the performance of purifying an exhaust gas by suppressing the variation of the air-fuel ratio of an engine occurring when the rotation cycle of the engine is substantially synchronous with the drive cycle of a purging control valve, and to prevent misfiring caused by a lean air-fuel mixture. An evaporative control system includes a purging control valve, located in a purge passage for communicating a canister with an intake passage of an engine, for controlling an amount of purged gas; an air-fuel ratio sensor; a fuel injection control device A, an engine speed detecting device, a duty cycle limiting device that, when a synchronism engine speed domain judging device for judging whether or not the engine speed of the engine falls within a synchronism domain in which synchronism with the drive cycle of the purging control valve is substantially attained, judges that the engine speed of the engine falls within the synchronism domain, and limits a duty cycle to a value within a set range according to the engine speed of the engine; a purge ratio calculating device for calculating a purge ratio according to the duty cycle limited to any value; and a purging control valve open/close control device for opening or closing the purging control valve at the duty cycle to provide the purge ratio calculated by the purge ratio calculating device.
REFERENCES:
patent: 5469833 (1995-11-01), Hara et al.
patent: 5507269 (1996-04-01), Morikawa
patent: 5572980 (1996-11-01), Nakagawa et al.
patent: 5609142 (1997-03-01), Osanai
patent: 5623914 (1997-04-01), Kawamoto et al.
Copending U.S. Patent Application Serial No. 548,887, filed Oct. 26, 1995.
Argenbright Tony M.
Toyota Jidosha & Kabushiki Kaisha
Vo Heu T.
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