Patent ID: RE39937

Claim:
An exhaust gas recirculation system being adapted for use with an engine, said engine having a cooling system defining a heat exchange having a coolant flowing therethrough said engine and said cooling system having a preestablished size and cooling rejection rate, said exhaust gas recirculation system comprising: at least a cylinder being positioned within said engine a piston being positioned in said cylinder and defining a compression stroke; a flow of intake air entering said cylinder; a supply of combustible fuel entering said cylinder a combustion process within said cylinder defining a flow of exhaust gas exiting therefrom; an exhaust valve regulator being interposed said flow of intake air and said flow of exhaust gas, said exhaust valve regulator being movable between an open position and a closed position; an exhaust gas cooler being positioned in said flow of exhaust gas being directed to said flow of intake air and said exhaust gas cooler having said coolant in said engine cooling said exhaust gas; and a control system having a plurality of sensors being in communication with said engine and communicating a signal to a controller, said controller having a plurality of paths or maps defined therein and said controller interpreting said signal defining an operating parameter of said engine and controlling said open position and said closed position of said exhaust valve regulator, and one of said plurality of maps defining a normal coolant temperature strategy having said supply of combustible fuel entering said cylinder being advanced and said quantity of said flow of exhaust gas being directed to said flow of intake air being at a maximum, and another of said plurality of maps defining a high coolant temperature strategy having said supply of combustible fuel entering said cylinder being retarded and said quantity of said flow of exhaust gas being directed to said flow of intake air being at a minimum.