Research On Torsional Vibration Control Method Of Parallel Hybrid Electric Vehicle Transmission System

In recent years,energy saving and new energy vehicles have become the key areas of development in China,and the automobile consumption market has been constantly upgraded,and the requirements of consumers for vehicles are also higher and higher.The vibration,noise and other problems caused by the torsional vibration of the vehicle transmission system directly affect the comfort and safety of the vehicle.In order to solve the problem and improve the related performance of the vehicle,the torsional vibration is studied in all aspects.Due to the integration of multiple power sources in the transmission system of hybrid electric vehicle,the torsional vibration problem of the transmission system presents more complex characteristics compared with the traditional vehicle.Therefore,this paper takes the parallel hybrid electric vehicle as the research object to carry out the relevant research on torsional vibration control.Firstly,according to the relevant simplification principles,the complex transmission system structure of parallel hybrid electric vehicle is simplified to obtain the centralized mass model of the whole vehicle transmission system;Based on the lumped mass model,according to the relevant modeling steps in AMESim software,the free vibration model and forced vibration model of vehicle transmission system are established,and the accuracy of the model is verified.Secondly,the free and forced torsional vibration models are simulated and analyzed.Through time domain analysis,frequency domain analysis and frequency spectrum analysis,the torsional vibration characteristics of the whole vehicle transmission system are obtained.Combined with the excitation characteristics of the power source,the resonance of the transmission system is analyzed,and the causes of resonance are analyzed.In addition,through the sensitivity analysis of the structural parameters which have great influence on the torsional vibration,the influence law of the relevant parameters on the torsional vibration is determined.Thirdly,in order to explore the control method of vehicle transmission system torsional vibration,the passive and active aspects are explored.In the passive control of torsional vibration,the dual mass flywheel(DMF)is added to effectively control the torsional vibration of the whole vehicle transmission system;In addition,relying on the multi platform cooperation function of i SIGHT software,the multi Island genetic algorithm(MIGA)is used to optimize the structural parameters of DMF and other parts of the transmission system based on response,and the global optimal solution is obtained.In the aspect of active control of torsional vibration,using the characteristics of fast response of driving motor,the torque of motor is controlled with active control as the core.Taking the three degree of freedom torsional vibration model as the control prototype,the motor torque is controlled by fuzzy adaptive PID controller in Simulink.The results show that compared with the traditional PID control,the fuzzy adaptive PID control has better control effect on the torsional vibration of the transmission system.Finally,through the establishment of the torsional vibration model of the transmission system,the analysis of the characteristics of the torsional vibration and the active and passive control of the torsional vibration,the torsional vibration of the transmission system is analyzed in an all-round way,and the reference scheme for the control of the torsional vibration of the transmission system of the parallel hybrid electric vehicle is provided.