Ride comfort of suspension vehicle

Trailer accessories suspension is one of the important parts of the vehicle. The ride comfort and handling stability of the vehicle are directly related to the performance of trailer accessories suspension. Passive trailer accessories suspension can not change with the change of road, so it is difficult to achieve the optimal performance on the changing road. Therefore, controllable electronic trailer accessories suspension is one of the important directions of automobile development. The accessory suspension of active Trailer needs external force to control the accessory suspension of trailer. Therefore, it will increase the energy consumption and the weight of the vehicle.

Vehicle ride comfort of trailer accessories suspension

The semi-active Trailer accessory suspension composed of elastic elements and damping force controllable shock absorber has the advantages of low energy consumption and easy realization, which can improve the ride comfort of the vehicle. Therefore, the semi-active Trailer accessory suspension has become a hot topic in the automotive field. Because the ride comfort of vehicle is concerned with low frequency vibration, and the air spring itself has good damping performance at low frequency, the variable stiffness semi-active Trailer accessory suspension system composed of air spring has a good application prospect. The accessory suspension of semi-active Trailer with variable stiffness is a nonlinear system, but the conventional control strategy applied to the nonlinear system has some limitations.

Vehicle ride comfort of trailer accessories suspension

In order to approach the actual system better and obtain better control effect, it is necessary to find more effective control strategy. Therefore, this paper analyzes the suspension characteristics of semi-active Trailer with variable stiffness. On this basis, the neural network adaptive control method is mainly studied, and its control simulation and experimental research are carried out. Firstly, according to the evaluation index of trailer accessory suspension, a 14 degree of freedom vehicle model of variable stiffness semi-active Trailer accessory suspension is established, and the vibration reduction is realized by changing the stiffness of air spring in Trailer accessory suspension system.

Vehicle ride comfort of trailer accessories suspension

Because of the nonlinearity of the air spring, neural network control is used to adjust the stiffness of the air spring in order to achieve the ideal damping effect of the trailer accessories suspension system. In the research, the vertical acceleration of the vehicle body is used as the main control target to improve the ride comfort of the vehicle. At the same time, the dynamic deflection of the trailer accessories suspension and the dynamic load of the wheel are taken into account in the simulation control research to improve the driving safety and handling stability of the vehicle. In the simulation study, the road excitation is white noise, sine wave and sawtooth wave. The types of trailer accessories suspension are passive trailer accessories suspension, PID control semi-active trailer accessories suspension and neural network control semi-active trailer accessories suspension. The body acceleration, dynamic deflection and wheel dynamic load of three kinds of trailer accessories suspension and their corresponding root mean square values are compared and analyzed. The simulation results show that the semi-active trailer accessories suspension is better than the passive trailer accessories suspension, and the neural network control effect is the best. www.chinaaxle.cn