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:
Feb. 25, 2014
Filed:
Apr. 21, 2010
Akikazu Uchida, Obu, JP;
Jun Tarui, Kariya, JP;
Toshiki Annoura, Nagoya, JP;
Hiroshi Katsurahara, Anjo, JP;
Akikazu Uchida, Obu, JP;
Jun Tarui, Kariya, JP;
Toshiki Annoura, Nagoya, JP;
Hiroshi Katsurahara, Anjo, JP;
Denso Corporation, Kariya, JP;
Abstract
A microcomputer of an alcohol concentration sensor reads a first measurement value corresponding to a first frequency and reads a second measurement value corresponding to a second frequency. The microcomputer calculates a difference between the first and second measurement values. The microcomputer performs stuck failure abnormality determination when a state where the difference between the measurement values is equal to or smaller than a predetermined value continues. The microcomputer outputs a PWM signal of a specific frequency, which is different from a frequency in a case of a normality, to an engine ECU. Thus, a failure of the alcohol concentration sensor can be surely determined.