Proper braking force distribution strategies can improve both stability and economy performance of hybrid electric vehicles, which is prominently proved by many studies. To achieve better dynamic stable performance and higher energy recovery efficiency, an effective braking control strategy for hybrid electric buses (HEB) based on vehicle mass and road slope estimation is proposed in this paper. Firstly, the road slope and the vehicle mass are estimated by a hybrid algorithm of extended Kalman filter (EKF) and recursive least square (RLS). Secondly, the total braking torque of HEB is calculated by the sliding mode controller (SMC), which uses the information of brake intensity, whole vehicle mass, and road slope. Finally, comprehensively considering driver's braking intention and regulations of the Economic Commission for Europe (ECE), the optimal proportional relationship between regenerative braking and pneumatic braking is obtained. Furthermore, related simulations and experiments are carried out on the hardware-in-the-loop test bench. Results show that the proposed strategy can effectively improve the braking performance and increase the recovered energy through precise control of the braking torque.

Zijun Liu;Shuo Cheng;Jinzhao Liu;Qiong Wu;Liang Li;Huawei Liang

State Key Laboratory of Automotive Safety and Energy,Tsinghua University,Beijing 100084,China;Beijing Forestry University,Beijing 100091,China;Uni-versity of Science and Technology,Hefei 230026,China;Institute of Applied Technology,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230088,China

中国机械工程学报

[1]Zijun Liu;Shuo Cheng;Jinzhao Liu;Qiong Wu;Liang Li;Huawei Liang-.A Novel Braking Control Strategy for Hybrid Electric Buses Based on Vehicle Mass and Road Slope Estimation)[J].中国机械工程学报,2022(06):29-39

Buses

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