초록 ▼

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 has a cylinder, a rotatabl

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 has 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 back to the cylinder and forming a flow of exhaust gas recirculation. The flow of exhaust gas recirculation is cooled. The flow of exhaust gas recirculation is mixed with exhaust gas and compressed to a second preestablished pressure by the positive displacement pump. The second preestablished pressure of the flow of exhaust gas recirculation is at least as great as the first preestablished pressure of the intake air. And, a quantity of the flow of exhaust gas recirculation is controlled by a mixing valve. The mixing valve has an open position in which a portion of the flow of intake air is mixed with the flow of exhaust gas recirculation and a closed position in which the flow of intake air is blocked.

대표청구항 ▼

[ What is claimed is:] [1.]1. An exhaust gas recirculation system for use with an engine, said engine defining a plurality of operating parameters, having a rotatable member through which an engine speed can be defined and a plurality of cylinders being defined as a part of the engine and an intake

[ What is claimed is:] [1.]1. An exhaust gas recirculation system for use with an engine, said engine defining a plurality of operating parameters, having a rotatable member through which an engine speed can be defined and a plurality of cylinders being defined as a part of the engine and an intake manifold being in communication with said plurality of cylinders, said exhaust gas recirculation system comprising:a flow of intake air entering said intake manifold and being distributed to a respective one of said plurality of cylinders, said intake air being pressurized to a preestablished pressure by a turbocharger;a supply of combustible fuel entering said respective one of said plurality of cylinders;a combustion process within said respective one of said plurality of cylinders defining a flow of exhaust gas having a preestablished pressure being less that said preestablished pressure of said intake air during at least a portion of said engine operating parameters;a portion of said exhaust gas being circulated to said intake air defining a flow of exhaust gas recirculation, said flow of exhaust gas recirculation being cooled prior to being pressurized to a preestablished level and said pressurization of said flow of recirculated exhaust gas being by a positive displacement pump and being at a pressure at least as great as said preestablished pressure of said intake air; anda mixing valve being interposed said flow of intake air exiting said turbocharger and said flow of exhaust gas recirculation; said mixing valve being movable between a closed position and an open position, and in said open position intake air being supplied to said positive displacement pump, said mixture of intake air and said exhaust gas entering said intake manifold and being distributed to at least one of said plurality of cylinders.