Design of 48 V automobile start-stop power system based on lithium ion capacitor

doi:10.12028/j.issn.2095-4239.2019.0110

Abstract

Abstract: Based on the self-developed lithium-ion capacitor, a 48 V start-stop power system vehicle model was built based on AVL-Cruise. Combined with the Ah metrology, open circuit voltage method and extended Kalman filtering algorithm, the device's state-of-charge (SOC) estimation module is designed to realize online SOC estimation. The energy management model based on fuzzy control is established in MATLAB/Simulink to realize the functions of engine start and stop, pure electric drive start, braking energy recovery and active coasting. Finally, the SOC of the power system and the fuel consumption of the vehicle are evaluated according to the New European Driving Cycle (NEDC) operation condition. The research results show that the system can achieve SOC estimation within 10% of the error, and the 48 V start-stop power system based on lithium ion capacitor has good fuel economy.

Key words: lithium ion capacitor, 48 V start-stop power system, SOC estimation, fuzzy control strategy, AVL-Cruise, MATLAB/Simulink

CLC Number:

TM911.3

GUO Xin, ZHAO Yefei, ZHENG Junsheng, QIN Nan, DAI Ningning. Design of 48 V automobile start-stop power system based on lithium ion capacitor[J]. Energy Storage Science and Technology, 2019, 8(6): 1159-1164.

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