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. 01, 1989
Filed:
Jan. 22, 1986
Applicant:
Inventors:
Takashi Shiraishi, Katsuta, JP;
Taiji Hasegawa, Nakaminato, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F02D / ; F02D / ; F02M / ;
U.S. Cl.
CPC ...
36443105 ; 123440 ; 123489 ;
Abstract
A method of controlling air-fuel ratio in which addition or subtraction is carried out on the basis of the output of an exhaust gas sensor to determine a feedback constant by which the air-fuel ratio is feedback-controlled. The feedback constant is changed at a given regular interval.