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:
Feb. 10, 1981
Filed:
Aug. 27, 1979
Honda Giken Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
Exhaust gas recirculation apparatus for an internal combustion engine employs a vacuum responsive control valve in a passageway connecting the engine exhaust passage to the engine intake passage downstream from the throttle valve. A unitary housing comprising a base, a body, and a cap contains an air control valve and a regulating valve each having a flexible diaphragm responsive to differential pressure. The diaphragm for the air control valve is clamped between the cap and the body, and the diaphragm for the regulating valve is clamped between the body and the base. Vacuum pressures on opposite sides of the diaphragm for the air control valve are obtained from a control pipe system and from an air conduit downstream from the air control valve. Vacuum pressures on opposite sides of the diaphragm for the regulating valve are obtained from a vacuum line and from the air conduit upstream from the air control valve. The regulating valve acts to control vacuum pressure in the control pipe system by bleeding vacuum pressure therein through a variable opening into the vacuum line.