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:
Feb. 13, 2001
Filed:
Mar. 22, 1999
Gerald N. Coleman, Peoria, IL (US);
Michael J. Evancik, Chillicothe, IL (US);
Dennis D. Feucht, Morton, IL (US);
Keith E. Lawrence, Peoria, IL (US);
Jiubo Ma, Dunlap, IL (US);
Caterpillar Inc., Peoria, IL (US);
Abstract
Past exhaust emission control systems fail to utilize exhaust gas recirculation during all operating parameters of an engine. The present exhaust gas recirculation system reduces the emissions emitted from an engine during all operating parameters of the engine. The engine includes a cylinder, a rotatable crankshaft and a turbocharger defining a compressor section compressing a flow of intake air to a first preestablished pressure and being driven by a flow of exhaust gas having a first preestablished pressure. The exhaust gas recirculation system is comprised of a portion of the flow of exhaust gas being recirculated to the cylinder and forming a flow of recirculated exhaust gas. The flow of recirculated exhaust gas is cooled. A portion of the flow of intake air is compressed to a second preestablished pressure. The flow of recirculated exhaust gas is compressed to a second preestablished pressure being at least as great as the first preestablished pressure of the intake air. And, a quantity of the flow of recirculated exhaust gas is controlled by a valve having an open position in which intake air flows therethrough and a closed position in which the flow of intake air is blocked.