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:
Jan. 02, 1979
Filed:
Jul. 11, 1977
Hiroshi Kuroiwa, Hitachi, JP;
Yutaka Nishimura, Katsuta, JP;
Yoshishige Ohyama, Katsuta, JP;
Torazo Nishimiya, Mito, JP;
Hitachi, Ltd., , JP;
Abstract
An air-fuel ratio control apparatus for use in a motor vehicle having an internal combustion engine provided with a carburetor including a main fuel supply system and a low speed fuel supply system for supplying fuel to the engine. The apparatus includes an electromagnetic valve for controlling the volume of air flowing through the air bleed of the main fuel supply system, an electromagnetic valve for controlling the volume of air flowing through the air bleed of the low speed fuel supply system, an O.sub.2 sensor for detecting the concentration of O.sub.2 in exhaust emissions, and a control circuit for producing as an output a control signal in accordance with a signal from the O.sub.2 sensor. The two electromagnetic valves are controlled by the same signal from the control circuit. A plurality of microswitches for detecting the starting of the engine, high speed operation of the engine and power operation of the engine respectively are provides so as to disconnect the control circuit from the electromagnetic valves.