Internal-combustion engines – Charge forming device – Having fuel vapor recovery and storage system
Reexamination Certificate
2008-06-05
2009-11-03
Moulis, Thomas N (Department: 3747)
Internal-combustion engines
Charge forming device
Having fuel vapor recovery and storage system
Reexamination Certificate
active
07610906
ABSTRACT:
A fuel vapor treatment system which has adsorbent, a purge passage for introducing a mixture gas of air and the fuel vapor desorbed from the adsorbent into the internal combustion engine, a detection passage which communicates to the purge passage, and a pump which generates gas flow so that the mixture gas flows into the detection passage from the purge passage. A pressure sensor detects fuel vapor concentration. An ECU and a purge control valve controls a purge of the mixture gas from the purge passage to the internal combustion engine based on a reference concentration of the fuel vapor. The ECU establishes the detection interval of the fuel vapor concentration in consideration of change in reference concentration.
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Japanese Office Action dated May 25, 2009, issued in counterpart Japanese Application No. 2007-166846, with English translation.
Kano Masao
Takakura Shinsuke
DENSO CORPORATION
Moulis Thomas N
Nixon & Vanderhye P.C.
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