Patent ID: 6055965
Filing Date: 2000-05-02
Classification: F02B,F02D,F02M,Y02T

Abstract:
A system for providing closed loop control of an exhaust gas recirculation flow in an internal combustion engine, said engine defining a combustion chamber for burning a fuel-air mixture and further including an intake air pressurizing device and an intake air flow path, said system comprising:an exhaust gas path for permitting a flow of exhaust gas from the combustion chamber to the intake air pressurizing device, said exhaust gas path including an exhaust gas bypass for recirculating exhaust gas to said intake air flow path;a bypass valve disposed proximate said exhaust gas bypass for selectively controlling the flow of said exhaust gas portion through said exhaust gas bypass to said intake air flow path;an intake air throttle valve for selectively controlling said intake air flow rate; andan engine controller connected to said bypass valve and to said intake air throttle valve for cooperatively controlling actuation and providing closed loop control of said bypass valve and said intake air throttle valve thereby providing control of exhaust gas recirculation flow.