Power system with medium pressure EGR low pressure stage drive tiered electric turbocharger

摘要

To provide a power system equipped with a turbocharger device capable of independent supercharging pressure control and EGR control, high energy efficiency, and high control response. A low-pressure stage driven hierarchical electric turbocharger comprising a low-pressure turbine / compressor connected to a motor generator and a high-pressure turbine / compressor, and an EGR path entrance between the high-pressure turbine and the low-pressure turbine. By combining the medium pressure EGR between the low pressure stage compressor and the high pressure stage compressor and controlling multiple control means with different characteristics for the supercharging pressure and EGR amount, the supercharging pressure and EGR amount can be controlled independently. Control. [Selection] Figure 2