Internal-combustion engines – Charge forming device – Including exhaust gas condition responsive means
Patent
1996-09-10
1997-10-14
Nelli, Raymond A.
Internal-combustion engines
Charge forming device
Including exhaust gas condition responsive means
123520, F02D 4100
Patent
active
056761180
ABSTRACT:
A fuel vapor purge control system of an automobile engine comprises fuel vapor concentration calculating means for calculating a concentration of fuel vapor in the purge flow based on a feedback correction coefficient, target purge rate calculating means for selectively setting a target purge rate depending on the magnitude of the fuel vapor concentration, purge valve controlling means for controlling the operation of a purge control valve so as to obtain the target purge rate, purge condition judging means for judging whether or not a purge condition to perform purging is satisfied based on operational conditions of the engine, wherein the target purge rate calculating means sets an initial target purge rate after the purge condition judging means judges that the purge condition is satisfied, the initial target purge rate being gradually increased with an elapse of time from an initial rate to a predetermined rate, and then sets a target purge rate depending on the fuel vapor concentration after the initial target purge rate reaches a predetermined rate and correction means for correcting the fuel injection amount by reducing an amount equivalent to a purged fuel vapor amount calculated based on the fuel vapor concentration and the target purge rate. Whereby the controllability of the air-fuel ratio control system can be prevented from being lowered with the utmost evap purge amount retained.
REFERENCES:
patent: 5445132 (1995-08-01), Isobe et al.
patent: 5445133 (1995-08-01), Nemoto
patent: 5450834 (1995-09-01), Yamanaka et al.
patent: 5460136 (1995-10-01), Yamazaki et al.
patent: 5469832 (1995-11-01), Nemoto
Farber Martin A.
Fuji Jukogyo Kabushiki Kaisha
Nelli Raymond A.
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