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. 17, 1979
Filed:
Apr. 06, 1978
Applicant:
Inventors:
Mitsuhiko Ezoe, Yokosuka, JP;
Setsuzo Tachibana, Yokosuka, JP;
Assignee:
Primary Examiner:
Int. Cl.
CPC ...
G01M / ;
U.S. Cl.
CPC ...
73118 ;
Abstract
At least one engine parameter is used to estimate the state of the gas sensor while the frequency of the feedback control signal produced in the closed loop control system is measured to see if it is normal or not. A logic circuit produces a pair of signals respectively indicative of normal or abnormal functioning of the closed loop control system in response to the estimated state of the gas sensor and the frequency of the feedback control signal, to illuminate visual indicators. An additional gas sensor tester is additionally provided for detecting the internal resistance of the sensor.