Internal-combustion engines – Charge forming device – Having fuel vapor recovery and storage system
Reexamination Certificate
2008-06-09
2009-10-20
Moulis, Thomas N (Department: 3747)
Internal-combustion engines
Charge forming device
Having fuel vapor recovery and storage system
C701S103000
Reexamination Certificate
active
07603990
ABSTRACT:
An ECU computes a transit time from a time when the fuel vapor passes the purge valve right after the purge valve is opened until a time when the fuel vapor reaches a vicinity of the fuel injector. Further more, the ECU computes a fuel vapor concentration at the vicinity of the fuel injector after the transit time has elapsed based on a first-order lag curve which is defined by a maximum variation of the fuel vapor concentration and a time constant. Correcting the fuel injection quantity according to the fuel vapor concentration at the vicinity of the injector restricts a disturbance of air-fuel ratio at a time of starting purge process.
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Japanese Office Action dated Apr. 7, 2009, issued in corresponding Japanese Application No. 2007-170121, with English translation.
Amano Noriyasu
Kano Masao
Takakura Shinsuke
Denso Corporation
Moulis Thomas N
Nippon Soken Inc.
Nixon & Vanderhye P.C.
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