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. 20, 1984
Filed:
Sep. 14, 1982
Ryuji Kataoka, Tokyo, JP;
Fuji Jukogyo Kabushiki Kaisha, Tokyo, JP;
Nissan Motor Company, Limited, Yokohama, JP;
Abstract
A method and system for controlling the air-fuel ratio for a carburetor for an internal combustion engine having an intake passage, an exhaust passage, a throttle valve, a detector for detecting the concentration of a constituent of the exhaust gases, an on-off type electromagnetic valve for correcting the air-fuel ratio of the air-fuel mixture supplied by an air-fuel mixture supplier and an electronic controller. The electronic controller comprises a comparing circuit for comparing the output signal of the detector with a stoichiometric reference signal, for driving the on-off electromagnetic valve for controlling the air-fuel ratio to a value approximating the stoichiometric air-fuel ratio. A switch connects a constant signal generating circuit to the electronic controller and renders the electronic control means non-responsive to the detector when a vacuum sensor actuates the switch during a rapid deceleration, whereby the on-off electromagnetic valve operates by the constant signal from the constant signal generating circuit at a predetermined duty ratio to prevent an excessive enrichment of the mixture caused by misfiring.