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:
Sep. 30, 1980
Filed:
Jan. 29, 1979
Applicant:
Inventors:
Noboru Toyama, Susono, JP;
Tatsuya Taifu, Susono, JP;
Assignee:
Toyota Jidosha Kogyo Kabushiki Kaisha, Toyota, JP;
Primary Examiner:
Int. Cl.
CPC ...
F02M / ;
U.S. Cl.
CPC ...
123568 ;
Abstract
In an exhaust gas recirculation system for an internal combustion engine of the back pressure control type which provides, by a vacuum-operated control valve, a pressure chamber of substantially constant and nearly atmospheric pressure at a middle portion of an exhaust gas recirculation passage, a thermostatic control means is incorporated in a vacuum passage which supplies control vacuum to the vacuum-operated control valve so as to modify the vacuum conducted therethrough in accordance with the temperature of the engine so that a partial ratio of exhaust gas recirculation is effected in cold operation of the engine.