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:
Oct. 06, 1987
Filed:
Mar. 11, 1985
Fuji Jukogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
An air-fuel ratio control system for a carburetor of an internal combustion engine comprises an O.sub.2 -sensor for detecting the concentration of the oxygen constituent of exhaust gases passing through an exhaust passage, an on-off electromagnetic valve for correcting the air-fuel ratio of the air-fuel mixture supplied by the carburetor, an electronic control circuit comprising a comparator for comparing an output signal of the O.sub.2 -sensor, an integration circuit, and a driving circuit for producing driving pulses for driving the electromagnetic valve in dependency on an output signal of the integration circuit for controlling the air-fuel ratio. A detector, such as an ignition pulse generating device, is provided for detecting conditions of operation of the internal combustion engine and for producing an engine operation signal, and a current control circuit responds to the engine operation signal for producing an output current. A delay circuit is provided to respond to the output current for delaying the output signal of the integration circuit.