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:
Apr. 03, 1984
Filed:
Jul. 14, 1982
Michio Kawagoe, Susono, JP;
Masaaki Tanaka, Susono, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
An exhaust gas recirculation control system for a vehicle diesel engine with an exhaust gas recirculation passage, including: a fluid pressure operated exhaust gas recirculation valve which controls flow resistance of the recirculation passage according to a control fluid pressure supplied thereto so as to increase the flow resistance up to a maximum substantially infinite value as the control fluid pressure approaches atmospheric pressure; an electrically operated switching over valve, which, when actuated, changes over the control fluid pressure supplied to the exhaust gas recirculation control valve to atmospheric pressure, and an exhaust gas recirculation control signal generating system which generates the control fluid pressure supplied to the exhaust gas recirculation control valve to operate it regularly as well as an electrical signal which actuates the switching over valve when the rate of change of engine load is greater than a certain predetermined value.