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:
Jul. 25, 2017
Filed:
Mar. 19, 2015
Denso Corporation, Kariya, Aichi-pref., JP;
Masafumi Umeno, Okazaki, JP;
DENSO CORPORATION, Kariya, JP;
Abstract
A gas-sensor control device includes a sweep circuit, a return sweep circuit, and a control portion. The sweep circuit energizes a detection current to flow through an oxygen sensor to calculates an impedance of the oxygen sensor. The return sweep circuit energizes a neutralization current to flow through the oxygen sensor in a direction opposite to a direction of the detection current, so as to remove electricity from the oxygen sensor that is energized by the detection current. The control portion executes a detection of an off failure of the sweep circuit and the return sweep circuit, only based on a sensor voltage acquired in a time period where the neutralization current flows through the oxygen sensor, and a threshold.