WSEAS TRANSACTIONS on SYSTEMS
Jianhui He, Guoqiang Ao, Jinsheng Guo, Ziqiang Chen, Lin Yang
Hybrid Electric Vehicle with Flywheel Energy Storage System
JIANHUI HE, GUOQIANG AO, JINSHENG GUO, ZIQIANG CHEN, LIN YANG School of Mechanical Engineering Shanghai Jiao Tong University Dong chuan Road No.800 Shanghai 200240, CHINA Jianhuihe@sjtu.edu.cn
Abstract: - A new hybrid-drive system taking flywheel energy storage system instead of chemical battery as assistant power source for hybrid electric vehicle is put forward. According to the particular energy characteristics of flywheel system, an energy management strategy based on fuzzy logic control is also developed with overall consideration on the optimization of both ICE (Internal Combustion Engine) and ISG (Integrated Started Generator). The strategy determines the optimal torque distribution between ICE and ISG through inputs of rotary speed of flywheel, rotary speed of ICE crankshaft and travel of accelerator pedal or brake pedal. Simulation results indicate that flywheel energy storage system is quite suitable for hybrid electric vehicle and with fuzzy logic control strategy both the performance of ICE and ISG are optimized that reduces fuel consumption of vehicle to greater extent.
Key-Words: - Flywheel energy storage system, ISG, Hybrid electric vehicle, Energy management, Fuzzy logic control
Flywheel energy storage system (FESS) is different from chemical battery and fuel cell. It is a new type of energy storage system that stores energy by mechanical form and was first applied in the field of space industry. With the development of flywheel technology, it is current be widely used in various industry fields. The vehicle ‘AFS20’ which was produced by U.S. flywheel system Inc. with original shape of Daimler-Kreisler began the Popularization of FESS towards automobile industry. Pullen, K.R has developed a kinetic energy storage for vehicle using based on flywheel technology . Gao Yimin has studied the characteristics of FESS and compared them to the vehicle requirements . Kascak. P has applied FESS to Bus and developed relative control strategy for driving.
In this paper, parameter of energy storage state for FESS is introduced, which makes it more convenient for the control of vehicle and can also be contrasted easily with the SOC (State of charge) of chemical battery and the charge state of ultra-capacitor as well. The energy characteristics of FESS are restudied according to the newly introduced energy storage state of flywheel system. Besides its use-cost is considered additionally to the analysis and calculation of FESS for Hybrid electric vehicle (HEV). According to the special energy characteristics of FESS, a fuzzy logic control strategy is also developed. With purpose of reducing fuel consumption, the strategy synthesizes all the influencing factors to determine the energy management of vehicle and both the operating points of ICE and ISG are optimized to dig full potential of hybrid technology
Issue 5, Volume 8, May 2009