Fuel vapor treatment system for internal combustion engine

Details Fuel vapor treatment system for internal combustion engine Fuel vapor treatment system for internal combustion engine

2008-01-22

2008-01-22

Miller, Carl (Department: 3747)

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

C123S357000

Reexamination Certificate

active

07320315

ABSTRACT:
A butterfly valve restricts flow passage areas of a purge passage and a blow-by gas passage by the same degree. A first pressure sensor detects variation in pressure of the purge gas, which is generated by the butterfly valve. A second pressure sensor detects variation in pressure of the blow-by gas, which is generated by the butterfly valve. Since a fuel vapor concentration of the blow-by gas is lower than that of the purge gas, the blow-by gas can be treated as air of 100%. Hence, the fuel vapor concentration is calculated based on the variations in pressure detected by the first pressure sensor and the second pressure sensor.

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European Search Report mailed Jun. 14, 2007 in European Application No. 07101160.5.
U.S. Appl. No. 11/529,278, Amano et al., filed Sep. 29, 2006, English counterpart of JP 2005-283940.

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