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:
Dec. 21, 1982
Filed:
Oct. 20, 1980
Tsutomu Matsuoka, Hiroshima, JP;
Toyo Kogyo Co., Ltd., Hiroshima, JP;
Abstract
An air-fuel ratio control system for an internal combustion engine including an automobile carburetor having a fuel passage for forming a combustible air-fuel mixture by mixing fuel fed through the fuel passage with air drawn from the atmosphere, comprises a catalytic converter for substantially purifying exhaust gases emitted from the engine, a composition sensor for sensing the concentration of a component of the exhaust gases as a function of the air-fuel mixing ratio of the combustible mixture burned in the engine, a first air bleed passage leading from the atmosphere to the fuel passage, a first actuator for controlling the flow of air through the first air bleed passage, an air-fuel ratio control for controlling the duty ratio of the first actuator in dependence on the output signal fed thereto from the composition sensor, a second air bleed passage leading from the atmosphere to the fuel passage, a second actuator for controlling the flow of air through the second air bleed passage, and an air bleed control for controlling the second actuator to permit the flow of the air to the fuel passage through the second air bleed passage together with the air flowing through the first air bleed passage only when the duty ratio of the first actuator attains a predetermined value.