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Study on Instantaneous Optimal Supervisory Control Strategy for a Series-parallel HEV

Hu Hongfei~1 Huang Xiangdong~(1,2) Luo Yutao~1 Zhao Kegang~11.Guangdong Provincial EV Key Lab.,South China University of Technology,Guangzhou,5106402.Guangzhou Automobile Industry Group Co.,Ltd.,Guangzhou,510030  
A new type of series-parallel combined hybrid electrical vehicle(HEV) was taken as the study subject,adopting a supervisory control strategy for energy management with the instantaneous equivalent fuel consumption as objective function.Based on the math models related to the entire vehicle and its powertrain,a MATLAB/Simulink simulation platform was built up,to theoretically search ideal maps of power distribution among powertrain's elements vs HEV's possible speed-torque sets and the corresponding gearshifts,which were then stored in the HEV's onboard supervisory controller.Data were looked up from the maps by the controller based on the instantaneous driving conditions,and were simply but properly modified according to the preset charge-sustaining requirements.Validity and real time responsibility of the supervisory control strategy are proved by simulations with several typical driving cycles,and are further confirmed by application aboard the HEV,revealing good practicability of the strategy.
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