초록 ▼

An exhaust gas recirculation and control system is provided for an internal combustion engine, wherein a portion of engine exhaust gas flow is recirculated through an EGR duct to engine intake air. The recirculated exhaust gas is pumped through the EGR duct by an EGR compressor driven by a dedicated

An exhaust gas recirculation and control system is provided for an internal combustion engine, wherein a portion of engine exhaust gas flow is recirculated through an EGR duct to engine intake air. The recirculated exhaust gas is pumped through the EGR duct by an EGR compressor driven by a dedicated EGR drive that is independently controllable. Because the EGR drive is independently powered and controlled, the EGR flow rate capacity of the system is not dictated by, or limited, by factors such as engine exhaust flow rate. A controller modulates power delivery to the drive means in response to at least one operating condition parameter in order to achieve a desired EGR flow rate. In order to further optimize efficiency, the EGR compressor is preferably a discrete displacement pump which is controllably drivable in a pulse-capture mode, wherein each intake of the EGR compressor is timed synchronously with exhaust pulses in the exhaust manifold.

대표청구항 ▼

[ What is claimed is:] [1.] An internal combustion engine having an intake duct, an exhaust duct, and an exhaust gas recirculation system comprising:an EGR duct guiding an EGR flow of exhaust gas from the exhaust duct to the intake duct;an EGR cooler located in the EGR duct cooling the EGR flow;an E

[ What is claimed is:] [1.] An internal combustion engine having an intake duct, an exhaust duct, and an exhaust gas recirculation system comprising:an EGR duct guiding an EGR flow of exhaust gas from the exhaust duct to the intake duct;an EGR cooler located in the EGR duct cooling the EGR flow;an EGR compressor located downstream of the EGR cooler pumping the EGR flow through the EGR duct;an independent EGR drive positively driving the EGR compressor; anda controller modulating power delivery to the independent EGR drive to adjustably achieve a desired output of the EGR compressor in response to input signals corresponding to at least one engine operating parameter;wherein said drive is a variable ratio coupling between a crankshaft of the engine and the EGR compressor.