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:
Apr. 19, 2005
Filed:
Apr. 08, 2003
Hisashi Iida, Kariya, JP;
Mitsuo Hara, Ichinomiya, JP;
Hideki Suzuki, Chita-gun, JP;
Yoshiyuki Okamoto, Kariya, JP;
Hisashi Iida, Kariya, JP;
Mitsuo Hara, Ichinomiya, JP;
Hideki Suzuki, Chita-gun, JP;
Yoshiyuki Okamoto, Kariya, JP;
Denso Corporation, Kariya, JP;
Abstract
A first oxygen sensor is mounted on an exhaust pipe. An ECU determines an electric power to be fed to a sensor heater, by a heater control quantity calculating block, in accordance with a difference between an actual impedance and a target impedance calculated by a running condition determining block and a specific gas sensitivity priority determining block. As a result, the detection sensitivity of the oxygen sensor to a rich component or a lean component is improved according to the running condition. This improved output is detected by an output detecting block and reflected on the air/fuel ratio control so that an air/fuel ratio is controlled thereby.