Design and Performance Prediction of a Supercharging System for Racing Cars with Electric Assist

According to the technical rules of Formula Student China (FSC), a set of small displacement mechanical supercharging system with speed regulation by electric assistant function, is based on a technical route which called “response enhancement technology”, invented by Gspeed Formula Student racing team. The process of theoretical calculation, the supercharger selection, motor selection, and design of the differential gear system to achieve speed regulation are also proposed following. The Variable Speed Mechanism consists of a battery-powered brushless DC motor controlled by electronic governor as the auxiliary drive source. A differential gear train is used to coupling the power input from motor and engine. The final transmission realized by 5PK belt drive. To avoid the failure of the system by motor broken, a one-way clutch is used to limit the reverse rotation of the motor. For speed regulation, three sets of schemes were developed according to different target focuses. 1-D CFD simulations software GT-Power was used to build up the supercharged engine model. The multi-body dynamics simulation analysis software VI-CarRealTime was used to simulate the laps. The results show that this system matches well, achieves the expected performance target, and has great potential in practical development and application.