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:
Sep. 15, 1981
Filed:
May. 25, 1979
Applicant:
Inventors:
Seiji Suda, Mito, JP;
Taiji Hasegawa, Minato, JP;
Yasunori Mouri, Katsuta, JP;
Toshio Furuhashi, Tomobe, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F02B / ; F02D / ;
U.S. Cl.
CPC ...
364431 ; 123440 ; 123480 ; 123489 ; 123589 ;
Abstract
A signal corresponding to the oxygen concentration in exhaust gas as detected by an O.sub.2 sensor is applied to a control logic circuit after analog conversion. The duty ratio of a pulse signal for keeping the optimum air-fuel ratio corresponding to a running state of an automobile is calculated by the use of the detection signal and in accordance with a program stored in a ROM in advance. The control pulse having the duty ratio is used for the switching control of a solenoid valve for regulating the air-fuel ratio of a mixture.