Patent ID: 6079211
Filing Date: 2000-06-27
Classification: F02B,Y02T

Abstract:
A variable geometry two-stage supercharging system for an internal combustion engine, comprisinga first stage compressor driven by a first electric motor;a turbine-driven by engine exhaust gas;a second stage compressor driven by said turbine and by a second electric motor;an air inlet for said second stage compressor bypassing said first stage compressor and including a check valve closing said air inlet during operation of said first stage compressor;air inlet control vanes on the air inlet of the second stage compressor for providing compressor inlet pre-whirl, said vanes being variable to control the amount of pre-whirl;an exhaust gas control valve for controlling the flow of engine exhaust gas to said turbine; andcontrol means for controlling said vanes, exhaust gas control valve and said first and second electric motors.