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. 23, 1981
Filed:
Nov. 26, 1979
Haruo Yuzawa, Tokyo, JP;
Tsuneomi Yano, Tokyo, JP;
Abstract
An exhaust gas recirculation system for an internal combustion engine for automotive use, wherein a diaphragm-operated recirculation rate control valve adapted to control the exhaust gas recirculation rate depending upon the relationship between the pressure of the exhaust gases passed through an orifice and a vacuum developed in the mixture supply system of the engine is used in combination with a solenoid and diaphragm operated vacuum compensating valve which is not only responsive to the pressure of the exhaust gases passed through the orifice but is controlled by a microcomputer responsive to various operational parameters of the engine so that the vacuum to be developed in the recirculation rate control valve is compensated to be optimum for operating conditions of the engine.