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:
May. 23, 1978
Filed:
Nov. 04, 1976
Masakazu Yoshida, Toyota, JA;
Toyota Jidosha Kogyo Kabushiki Kaisha, Toyota, JA;
Abstract
An exhaust gas recirculation apparatus for an internal combustion engine, provided with a vacuum-operated EGR valve having a diaphragm which forms a vacuum control chamber on one side of the diaphragm, which chamber is connected to a vacuum port formed in the engine intake system for transmitting a vacuum signal to the chamber in order to operate the EGR valve for controlling the amount of exhaust gas to be recirculated. The apparatus is further provided with a temperature detecting valve adapted for introducing a limited amount of air through an orifice when the engine is operating under a warm-up condition during which the temperature of the engine is not yet sufficiently increased, so that the amount of the gas recirculated during such an operation is decreased to some extent. The amount of the emission of NO.sub.x component is slightly increased whereas the amounts of the emissions of CO and HC components are decreased. Therefore, the amounts of the emissions of the three major toxic components NO.sub.x, CO and HC are equalized.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile