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. 05, 1980
Filed:
Nov. 16, 1977
Syunichi Aoyama, Yokohama, JP;
Nissan Motor Company, Limited, Yokohama, JP;
Abstract
A restriction is formed in a branch passage of the exhaust gas passageway of an engine having a plurality of combustion chambers, which passage communicates at its upstream end with only a part of the combustion chambers of the engine, to divide the branch passage into upstream and downstream sections, and the EGR passageway connects the upstream section and the induction passageway of the engine, and the EGR rate is controlled by controlling a vacuum for operating the EGR control valve in accordance with the pressure differential between the upstream and downstream sections and/or a venturi vacuum to control the degree of opening of the EGR control valve and therefore the pressure differential between the sections and therefore the flow rate of exhaust gases passing through the restriction.