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. 21, 1987
Filed:
Apr. 30, 1985
Applicant:
Inventor:
Tsuyoshi Kitahara, Ina, JP;
Assignee:
Nissan Motor Co., Ltd., Yokohama, JP;
Primary Examiner:
Int. Cl.
CPC ...
F02D / ;
U.S. Cl.
CPC ...
123440 ; 123489 ; 204425 ;
Abstract
In order for increased precision control of air/fuel ratio, a pump electric current indicative voltage and a pump electric voltage are selectively used as an air/fuel ratio indicative signal in such a manner that the pump electric voltage is used at the stoichiometry, while the pump electric current indicative voltage is used as the air/fuel ratio indicative signal at an air/fuel ratio other than the stoichiometry. According to another aspect of the invention, the pump electric current indicative voltage is offset in response to step change in the pump electric voltage to generate an air/fuel ratio indicative signal which changes rapidly at the stoichiometry.