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. 20, 1980
Filed:
Dec. 06, 1978
Keigo Yorioka, Oobu, JP;
Aisan Industry Co., Ltd., Ohbu, JP;
Abstract
An exhaust gas recirculation system for an internal combustion engine wherein a fixed restriction, a pressure chamber and a pressure control valve are arranged in the order named in an exhaust gas recirculation passage and the pressure control valve is controlled in such a way that the pressure in the pressure chamber may be maintained equal to the combined pressure which is obtained by the comparison between two amplified pressure signals A and B both of which represent the quantity such as the negative pressure in an intake pipe which in turn represents the variations in load on the engine. With these two pressure signals A and B, the pressure in the pressure chamber may be varied from the exhaust gas pressure to the pressure a few times the negative pressure created in a venturi in the intake pipe, whereby in response to the variations in load on the engine, which may be represented by the variations in the negative pressure in the intake pipe, the ratio of the flow rate of the exhaust gases to be recirculated to the quantity of the intake air may be varied more widely than in the exhaust gas recirculation system.