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. 14, 1993
Filed:
Aug. 12, 1992
Kouichi Osawa, Susono, JP;
Toyota Jidosha Kabushiki Kaisha, Aichi, JP;
Abstract
A diagnostic device for an exhaust gas recirculation device comprising an exhaust gas recirculation control valve. When the temperature of the engine cooling water exceeds a predetermined temperature, vacuum acts on the vacuum chamber of the exhaust gas recirculation control valve and the supply of the exhaust gas recirculation gas is started. A temperature sensor is arranged in the exhaust gas recirculation passage. When the temperature of the engine cooling water is slightly lower than the predetermined temperature, if the temperature of the interior of the exhaust gas recirculation passage exceeds a predetermined temperature, it is determined that the exhaust gas recirculation control device has malfunctioned.