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:
Dec. 06, 2005
Filed:
Mar. 24, 2005
Noriyasu Amano, Gamagori, JP;
Takanobu Kawano, Okazaki, JP;
Koichi Inagaki, Aichi-gun, JP;
Nobuhiko Koyama, Nagoya, JP;
Masao Kano, Gamagori, JP;
Shinsuke Takakura, Kariya, JP;
Yoshichika Yamada, Kuwana-gun, JP;
Noriyasu Amano, Gamagori, JP;
Takanobu Kawano, Okazaki, JP;
Koichi Inagaki, Aichi-gun, JP;
Nobuhiko Koyama, Nagoya, JP;
Masao Kano, Gamagori, JP;
Shinsuke Takakura, Kariya, JP;
Yoshichika Yamada, Kuwana-gun, JP;
Denso Corporation, Kariya, JP;
Nippon Soken, Inc., Nishie, JP;
Abstract
A pump generates a gas flow within a measurement passage having an orifice. A differential pressure sensor detects a pressure difference between both ends of the orifice. Switching valves are disposed in the measurement passage to create a first concentration measurement state in which the measurement passage is opened at both ends thereof and the gas flowing through the measurement passage is the atmosphere, and a second concentration measurement state in which the measurement passage is in communication at both ends thereof with a canister and the gas flowing through the measurement passage is a fuel vapor-containing air-fuel mixture provided from the canister. An ECU calculates a fuel vapor concentration by based on a pressure difference detected in the first concentration measurement state and a pressure difference detected in the second concentration measurement state.