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:
Aug. 19, 2008
Filed:
May. 04, 2007
Yuji Zushi, Chiyoda-ku, JP;
Toru Tanaka, Chiyoda-ku, JP;
Michihisa Yokono, Kobe, JP;
Akihiro Fukui, Kobe, JP;
Yusuke Matsuda, Chiyoda-Ku, JP;
Yuji Zushi, Chiyoda-ku, JP;
Toru Tanaka, Chiyoda-ku, JP;
Michihisa Yokono, Kobe, JP;
Akihiro Fukui, Kobe, JP;
Yusuke Matsuda, Chiyoda-Ku, JP;
Mitsubishi Electric Corporation, Tokyo, JP;
Abstract
Respective positive terminal electric potentials of exhaust gas sensors are sequentially selectively inputted to an analog input terminal of a multi-channel AD converter through a multiplexer. An offset voltage is applied to respective negative terminals of the exhaust gas sensors. This offset voltage is inputted to another input terminal of the multi-channel AD converter. A microprocessor detects a generating voltage of the exhaust gas sensors by the difference between a digital converting value of the positive terminal electric potential and a digital converting value of the negative terminal electric potential. The microprocessor also individually judges that each of the digital converting values is excessively small and excessively large. Thus, the microprocessor judges the existence of ground, sky short circuit and disconnection abnormalities of the negative terminal and the positive terminal.