Abstract:

For the impact vibration problem of vehicle high?power electromechanical composite transmission system （EMT） in complex excitation working conditions， such as load fluctuation and engine torque pulsation， a master?slave control method of torsional vibration of EMT is proposed. In this method， the master?slave control strategy is used to establish the coupling constraint between the two driving motors， and the characteristics of EMT system are improved by optimizing the virtual lever coefficient to realize the peak clipping of torsional vibration in low?frequency domain. Firstly， the multi degree of freedom lumped parameter dynamic model of the EMT system is established， and the natural vibration characteristics of the system are analyzed. Secondly， the cascade control architecture of HEV drive control and torsional vibration active suppression is designed. Then the torsional vibration active control algorithm is designed based on the master?slave control algorithm （M?SAC）， and the influence of lever coefficient on the vibration characteristics of the system is analyzed. Finally， the simulation is carried out in MATLAB and it is compared with the optimal modal control algorithm （IMSOC）. The results show that there is a coupling relationship between the master?slave controller parameters and the system mechanical parameters. The master?slave control parameters will change the position of the resonance frequency point of the system， and significantly change the vibration response amplitude of the system. Selecting appropriate control parameters can realize the peak clipping of EMT torsional resonance amplitude， which is of great significance to improve the NVH performance of the EMT.

Key words: EMT, dynamic analysis, torsional vibration characteristics, active vibration control, master?slave control