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:
Jun. 16, 1981
Filed:
Jul. 18, 1979
Hidemi Onaka, Susono, JP;
Toyota Jidosha Kogyo Kabushiki Kaisha, Aichi, JP;
Abstract
An exhaust gas recirculation system is disclosed, which is of the well-known type wherein an exhaust gas recirculation control valve in the exhaust gas recirculation passage controls the amount of exhaust gas recirculation. An orifice element, upstream of the exhaust gas recirculation valve in the passage, defines a pressure chamber between itself and the exhaust gas recirculation control valve. The vacuum supplied to the diaphragm chamber of the exhaust gas recirculation control valve is modified by a vacuum adjustment valve with two chambers on opposite sides of a biased diaphragm, the one chamber being supplied with the pressure in the pressure chamber, and the other chamber being supplied with atmospheric air through an air bleed means at a certain rate. The improvement of the present invention comprises varying the performance of the supply of air through the air bleed means in accordance with the load on the engine. In preferred embodiments the air bleed means incorporates an air bleed control valve which varies the amount of air bled in various ways in accordance with the vacuum at various particular points in the inlet manifold.