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:
Jul. 20, 1976
Filed:
Mar. 07, 1975
Roland B Caldwell, Worthington, OH (US);
Ranco Incorporated, Columbus, OH (US);
Abstract
An exhaust gas recirculation control system for an internal combustion engine is disclosed in which a pressure operated exhaust gas recirculation (EGR) valve governs the flow of engine exhaust gas into the engine intake. The EGR valve is supplied with operating pressure from the engine intake manifold via a pressure amplifier. The amplifier has a pressure input which tends to vary in relation to the flow rate of gas through the engine so that the EGR valve operating pressure varies as an amplified function of the amplifier input pressure signal. A control valve modifies the amplifier input signal as a function of intake manifold pressure to enable the EGR valve operation to be programmed as desired throughout the range of operation of the engine.