Dynamic Matching Of Tire And Steering System

The tire is the only part of the car in contact with the ground,and its performance has a direct impact on the handling stability.However,due to the strong nonlinearity of tire structure and material,it is difficult to study mechanical properties of tires.As for the matching study of tire and vehicle,it is even more difficult.How to select tires with matching performance for target models is a common concern of tire manufacturers and vehicle design factories.At this stage,design and production of tires and vehicle design are still independent of each other.The tire manufacturer’s evaluation of tire mechanical properties is still limited to its performance on the test bench,while ignoring the tire’s response on the vehicle and the tire’s impact on the vehicle’s performance.When the vehicle design company selects the corresponding tires of the target model,it is also based on the tire parameters provided by the tire factory in the later stage,rather than considering the impact of tire performance in the early design stage.Therefore,for vehicle development engineers,how to find new methods to promote the matching between tire and vehicle performance is one of the important research tasks.The virtual evaluation method can preliminarily analyze the handling stability of the vehicle model by building a high-precision vehicle model.It also can determine the performance requirements of target tires in the early stage of design,and play a positive role in vehicle forward development.Therefore,on the basis of the group’s research on tire dynamics and vehicle dynamics,this paper has carried out the following work:1.The research and modeling of friction,stiffness and power assist characteristics of steering systemThrough the study of friction,stiffness and power assist characteristics,the article determines friction,stiffness and power assist models required for the construction of the steering system.Through the bench test of the steering system,the performance parameters of the steering system are extracted and input into the built steering system model.Finally,the accuracy of the model is verified by the built steering system bench test simulation,which is beneficial to the subsequent research on tire dynamics matching.2.Vehicle model building and model accuracy verificationOn the basis of the steering system model,this paper briefly introduces the tire model.The tire mechanical performance parameters are obtained by identifying the test data obtained by the tire test,and the PAC2002 tire model is built.In addition,this paper continues to build suspension,body,powertrain models,and finally assembles the vehicle model.Through the co-simulation of ADAMS and Simulink,compared with the handling stability test data of the test sample vehicle under different working conditions,the accuracy of the vehicle model is verified,which laid a foundation for the subsequent tire dynamics matching work.3.Research on the influence of tire and steering system matching on vehicle handling stabilityCombined with the basic theory of tire dynamics and DOE design requirements,the response coefficients of two PAC2002 tires and the friction torque coefficient and the kingpin coefficient of steering system are selected as test factors.A co-simulation platform composed of ADAMS and Simulink is built to conduct orthogonal test for the handling stability of the vehicle.By analyzing the simulation results of the orthogonal test,the influence of tire response coefficient,steering system friction torque coefficient and kingpin coefficient on different working conditions and different indicators is obtained,which provides the guidance for the forward development of automobiles and the design and production of tires.