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. 19, 1978
Filed:
Apr. 12, 1977
Syunichi Aoyama, Yokohama, JP;
Abstract
An EGR control valve operating diaphragm unit operated by the difference between an exhaust gas pressure in a chamber interposed between the EGR control valve and a restriction provided in the EGR passageway upstream of the EGR control valve and a venturi vacuum in the engine intake passageway or a combination of an EGR control valve operating diaphragm unit operated by the difference between the atmospheric pressure and an engine suction vacuum and a pressure regulating valve controlling the flow of atmospheric air admitted for diluting the suction vacuum which diaphragm unit or combination operates the EGR control valve to reduce and increase the exhaust gas pressure in the chamber in the EGR passageway in accordance with increases and decreases in the venturi vacuum, respectively.