Abstract
Irregular internal excitation (engine excitation and motor excitation) and external excitation (road excitation) can cause torsional vibration which even leads to the break of shaft of parallel hybrid electric vehicle (HEV) powertrain. Moreover, the current energy management control strategy ignores the significance of torsional stability of HEV powertrain when formulates the operating domain. The objective of this paper is to optimize the control strategy of parallel hybrid electric vehicle with multiple excitation sources to improve the torsional stability. To achieve the goal, the simplified two-mass nonlinear dynamic model of HEV powertrain is established. Then we apply the nonlinear dynamics to predict the torsional instability range of HEV powertrain. The theoretical analytical results are used to instruct to optimize the control strategy. Finally we set up the experimental platform and perform the experiment to verify the optimization of control strategy. The experimental results show that the HEV powertrain experience torsional instability under current control strategy. The critical speed when the operation mode of HEV switches from electric driving mode to hybrid driving mode was optimized to vc = 16km/h. The operating domain of engine was optimized to 1670 < n1 < 1850rpm under hybrid driving mode and driving and charging mode. The results reveals that optimization of control strategy can improve torsional stability of HEV powertrain effectively.
Highlights
Due to mutative gas explosion pressure and reciprocating inertial force
When the engine participates in when hybrid electric vehicle (HEV) switches from electric driving mode to hybrid driving mode, the HEV powertrain may enter into torsional instability area
The operating domain of engine was optimized to 1670 < n1 < 1850rpm, which is same as the operating domain under hybrid driving mode to reduce the change times of control strategy when the driving mode of HEV switches
Summary
Due to mutative gas explosion pressure and reciprocating inertial force. The electromechanical coupling effect is more likely to trigger electromagnetic excitation. Yue et al.[14] analyzed the amplitude-frequency characteristic of torsional vibration in two different modes of the HEV powertrain (hybrid driving mode and generating mode). Few people consider the influence of torsional stability of HEV powertrain when the energy management control strategy is developed. The purpose of this paper is to improve control strategy considering torsional stability of HEV powertrain under three typical driving mode. (i) The current energy management control strategy aims at reducing fuel consumption and improving cost efficiency. Few researches consider the torsional characteristics of HEV powertrain under different driving mode of HEVs in reality with certain energy management control strategy. The torsional characteristics of HEV powertrain were analyzed to instruct the optimization of control strategy
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