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. 28, 1990
Filed:
Apr. 21, 1989
Masahiko Yakuwa, Wako, JP;
Tomohiko Kawanabe, Wako, JP;
Hisashi Igarashi, Wako, JP;
Hiroshi Ohno, Wako, JP;
Honda Giken Kogyo K.K., Tokyo, JP;
Abstract
A method of detecting failure of an exhaust gas component concentration sensor for detecting concentration of a component of exhaust gases from an internal combustion engine. The method comprises the steps of: (1) applying a predetermined voltage to the sensor, (2) determining whether or not a change in an output voltage from the sensor caused by the application of the predetermined voltage to the sensor is smaller than a predetermined value, and (3) deciding that the sensor is faulty when the change in the output voltage is smaller than the predetermined value. A device for sensing concentration of a component of exhaust gases from an internal combustion engine comprising an electric resistance member connected in series between an electric current supply source and one of a pair of electrodes provided on a solid electrolytic element. A device for detecting failure of an exhaust gas component concentration sensing device comprising a constant voltage supply source for applying a predetermined voltage to the sensing device, and a switch connected between the constant voltage supply source and one of a pair of electrodes provided on an electrolytic element of the sensing device, for applying the predetermined voltage to the one of the electrodes when the switch is closed.