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. 16, 1982
Filed:
May. 28, 1980
Nissan Motor Company, Limited, Yokohama, JP;
Abstract
Disclosed is an air/fuel control system for an internal combustion engine which selectively carries out open loop control and feedback control in which the air/fuel ratio is controlled based on the sensed concentration of an exhaust gas component. The system has a means for generating a variable reference signal corresponding to an exhaust gas sensor output and a means for measuring a period after the air-fuel mixture becomes rich and for generating a signal for switching control operation from feedback control to open loop control. The latter means clears the measured period responsive to interrupting feedback control after the expiration of a given period. This effectively prevents control operation from switching too frequently between feedback control and open loop control.