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. 08, 1977
Filed:
Oct. 30, 1975
Koyo Nakamura, Yokosuka, JA;
Hiroshi Sanbuichi, Yokohama, JA;
Nissan Motor Co., Ltd., , JA;
Abstract
With respect to an internal combustion engine equipped with a carburetor and a catalytic converter which requires to feed the engine with a stoichiometric air/fuel mixture, the control system is for regulating the air/fuel ratio produced in the carburetor and comprises an auxiliary air admitting passage connected to the fuel discharge passage of the carburetor in addition to a usual air bleed passage for the fuel discharge passage, an electromagnetic valve for controlling the admission of air into the auxiliary passage, an oxygen sensor disposed in the exhaust system upstream of the catalytic converter, and a control circuit for producing continual pulses at a frequency between 5 and 100 Hz. The widths of the individual pulses are increased gradually while the output of the oxygen sensor indicates the air/fuel ratio being below the stoichiometric ratio, and vice versa. The valve is opened as each pulse is applied thereto so that the air feed rate to the fuel in the fuel passage is momentarily augmented by admission of air into the auxiliary passage.