초록 ▼

An exhaust gas recirculation (EGR) enhancement system for a turbocharged internal combustion engine includes a throttle valve arranged in the exhaust duct of the engine, downstream of the EGR system. The throttle valve is controlled in response to engine load and engine speed to selectively provide

An exhaust gas recirculation (EGR) enhancement system for a turbocharged internal combustion engine includes a throttle valve arranged in the exhaust duct of the engine, downstream of the EGR system. The throttle valve is controlled in response to engine load and engine speed to selectively provide back pressure upstream of the throttle valve to selectively drive an EGR exhaust flow through an EGR duct to the intake manifold. An embodiment of the EGR system includes a cooler that lowers the temperature of the EGR exhaust flow to provide better reductions in nitric oxide emissions. The turbine is equipped to allow excess pressure to be released through a wastegate duct arranged in fluid parallel with the exhaust turbine, thereby allowing for higher power and higher speeds.

대표청구항 ▼

[ What is claimed is:] [1.]1. An internal combustion engine having an intake duct, an exhaust duct, and an exhaust gas recirculation system comprising:an EGR duct connected in fluid communication with the exhaust duct for guiding an EGR flow of exhaust gas from the exhaust duct to the intake duct;an

[ What is claimed is:] [1.]1. An internal combustion engine having an intake duct, an exhaust duct, and an exhaust gas recirculation system comprising:an EGR duct connected in fluid communication with the exhaust duct for guiding an EGR flow of exhaust gas from the exhaust duct to the intake duct;an EGR cooler located in the EGR duct for cooling the EGR flow prior to entering the intake duct;an exhaust turbine in the exhaust duct downstream of said EGR duct, the turbine driving an intake compressor;a throttle valve arranged in the exhaust duct downstream of said EGR duct operable to selectably restrict flow through the exhaust duct; anda controller operable to adjust the throttle valve;a wastegate duct in communication with the exhaust duct for bypassing a wastegate flow from the exhaust duct upstream of the exhaust turbine to reenter the exhaust duct downstream of the turbine; anda wastegate valve located in the wastegate bypass duct for selectively restricting said wastegate flow.