The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 22, 2008
Filed:
Jan. 30, 2007
Noriyasu Amano, Gamagori, JP;
Hideaki Itakura, Nagoya, JP;
Makoto Otsubo, Nishio, JP;
Kazuhiro Hayashi, Nishikamo-gun, JP;
Shinsuke Takakura, Kariya, JP;
Noriyasu Amano, Gamagori, JP;
Hideaki Itakura, Nagoya, JP;
Makoto Otsubo, Nishio, JP;
Kazuhiro Hayashi, Nishikamo-gun, JP;
Shinsuke Takakura, Kariya, JP;
Denso Corporation, Kariya, Aichi-pref., JP;
Nippon Soken, Inc., Nishio, Aichi-pref., JP;
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.