| 摘要 |
A system for controlling exhaust gas recirculation flow rates and power augmentation of a turbocharged internal combustion engine (20) operating on diesel fuel or other fuels. Exhaust gas from the engine's exhaust manifold (30) is used to drive the turbocharger (24). Exhaust gas exiting from the turbocharger (24) is directed through a filter trap (44). A first portion of the exhaust gas exiting the filter trap flows through an exhaust gas recirculation cooler (152) to provide a first input to an electronically controlled diverter valve (138). A mixed output of intake air and recirculated exhaust gas is directed from the diverter valve (138) to an electrically driven compressor (82) and then to the intake manifold (34) of the diesel engine (20). The combination of the electronically controlled diverter valve (138) and the electrically driven compressor (82) controls both the exhaust gas recirculation flow rates and smoke limited power output at speeds below the peak torque speed of the associated engine. Above peak torque speeds, the turbocharger (24) generally supplies all required intake air to the engine and the electrically driven compressor (82) supplies only recirculated exhaust gas to control NOx emissions from the engine. |
