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:
Nov. 28, 1978
Filed:
Dec. 20, 1976
Applicant:
Inventor:
Mitsuhiko Ezoe, Yokosuka, JP;
Assignee:
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F02B / ; F02M / ; F01N / ;
U.S. Cl.
CPC ...
123 / ; 1231 / ; 60276 ; 60285 ;
Abstract
A closed-loop emission control apparatus for a multi-cylinder internal combustion engine having a plurality of exhaust systems includes an exhaust composition sensor for each exhaust system and a failure detector responsive to the output from each exhaust composition sensor. The air-fuel ratios of the exhaust systems are controlled by a signal whose amplitude is representative of a mean value of the concentration values of the exhaust composition sensed by both working sensors, and in response to the output from the failure detector the ratios are controlled by a valid signal from a working sensor should the other fail.