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:
Oct. 21, 1986
Filed:
Sep. 04, 1984
Eiji Kishida, Tokyo, JP;
Shumpei Hasegawa, Saitama, JP;
Honda Giken Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A secondary air intake system is used in an internal combustion engine. The system supplies secondary air through a first and a second secondary air passage. The first secondary air passage includes a first vacuum operated air control valve. A vacuum control which includes an electrically operated vacuum control valve operates the first vacuum operated air control valve to vary the effective area of the first secondary air passage. The second secondary air passage includes a second vacuum operated air control valve and an electrically operated air control valve positioned in series. Intake manifold vacuum operates the second vacuum operated air control valve to vary the effective area of the second secondary air passage. An air-fuel ratio control which includes an intake air temperature sensor, an exhaust gas oxygen concentration sensor and a throttle plate vacuum sensor determines the engine air-fuel ratio to intermittently open and close the electrically operated air control valve to open and close the second secondary air control passage. The air-fuel ratio control also operates the electrically operated vacuum control valve to gradually open and close the first vacuum operated air control valve to gradually open and close the first secondary air passage.