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Research on hybrid modeling and predictive energy management for power split hybrid electric vehicle

Wang Shaohua, Zhang Sheng, Shi Dehua, Sun Xiaoqiang, Yang Tao

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2021

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Vol. 69, nr 3

art. no. e137064

EN

Due to the coexistence of continuity and discreteness, energy management of a multi-mode power split hybrid electric vehicle (HEV) can be considered a typical hybrid system. Therefore, the hybrid system theory is applied to investigate the optimum energy distribution strategy of a power split multi-mode HEV. In order to obtain a unified description of the continuous/discrete dynamics, including both the steady power distribution process and mode switching behaviors, mixed logical dynamical (MLD) modeling is adopted to build the control-oriented model. Moreover, linear piecewise affine (PWA) technology is applied to deal with nonlinear characteristics in MLD modeling. The MLD model is finally obtained through a high level modeling language, i.e. HYSDEL. Based on the MLD model, hybrid model predictive control (HMPC) strategy is proposed, where a mixed integer quadratic programming (MIQP) problem is constructed for optimum power distribution. Simulation studies under different driving cycles demonstrate that the proposed control strategy can have a superior control effect as compared with the rule-based control strategy.

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Parameter sensitivity analysis and optimization of vibration energy of a hybrid energy-regenerative suspension

Wang Jiajia, Chen Long, Wang Ruochen, Meng Xiangpeng, Shi Dehua

Journal of Theoretical and Applied Mechanics

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2019

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Vol. 57 nr 3

641--653

EN

To reveal energy transfer characteristics of a hybrid energy-regenerative suspension during the driving process, a two-degree-of-freedom suspension model considering the nonlinearity of the tire damping is proposed. Meanwhile, energy efficiency, the unified index for all driving conditions, is obtained, and its sensitivity to different influencing factors is deeply analyzed. The results obviously show that the influence of the same structural parameters on energy efficiency varies with the excitation frequency of the road surface, especially at 1 Hz and 10 Hz. Based on these results, the damping values under different frequency bands are optimized to balance the energy recovery and dynamic performances of the suspension.

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Energy management strategy of dual planetary hybrid electric vehicle based on optimal transmission efficiency

Wang Shangxu, Li Jiaxin, Shi Dehua, Sun Xiaoqiang, Yao Yong

Journal of Theoretical and Applied Mechanics

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2019

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Vol. 57 nr 2

383--396

EN

A power split hybrid electric vehicle with dual planetary gear sets is studied in this paper. Firstly, the power split and circulation phenomenon are further described by analyzing a speed and torque relationship between the engine, motors and the output shaft based on the lever analogy. The transmission efficiency and the electric power ratio are then obtained. The working modes of the hybrid electric vehicle (HEV) are divided according to the system operation mechanism. On this basis, the engine optimal operating line (OOL) control strategy and the mechanical point (MP) control strategy are designed. Furthermore, a fuzzy controller is designed to realize the optimal torque distribution of the engine and the motors in the MP control strategy. Simulation results demonstrate that the MP control strategy can guarantee a higher efficiency of the transmission system, which also shows good performance in improving fuel economy of the HEV by adjusting the engine operating point.