초록 ▼

An improved method and apparatus for increasing the charge air supply to an internal combustion engine throughout the engine operating range, and more particularly, at low engine speeds, and combines controlled two-stage compression of charge air with improved turbocharger operation to achieve a par

An improved method and apparatus for increasing the charge air supply to an internal combustion engine throughout the engine operating range, and more particularly, at low engine speeds, and combines controlled two-stage compression of charge air with improved turbocharger operation to achieve a particularly flexible and effective supercharging system. Such supercharging systems are provided by a first charge air compressor driven by an electric motor, a second charge air compressor driven by an exhaust gas driven turbine, gas control means for the supercharging system and a control for the electric motor-driven compressor and gas control means. Preferably, the turbine-driven charge air compressor is also driven by a second electric motor operated by the control, and the gas control means comprises an exhaust gas diverter valve for the exhaust gas turbine inlet and pre-whirl vanes for the turbine-driven compressor inlet, both operated by the control.

대표청구항 ▼

[ What is claimed is:] [1.] 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

[ What is claimed is:] [1.] 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.