The Analysis On The Kingpin Angle Of The Light Truck Based On Steering Returnability

After carrying thirty thousand kilometers of the reliability test, the light Light-truck vehicle which develop by some domestic companies appeared poor in Straight Driving Stability, the driver required to correct steering wheel constantly to revised this phenomenon. This greatly reduces the handling stability and competitiveness At the premium end of the market. In this paper,For the problems appears in automobiles Returnability test of Light-truck vehicle, we using Dynamic modeling, virtual simulation and experimental verification to study a combination of Wheel Alignment Parameters how to affect the performance of truck,and from the perspective of research costs and research and developing efficiency to presents plans for improvement.First, Based on the Requirement of steering reversal and evaluation methods of steering reversal, we established an Steering Torque Dynamic modeling and an Steering Resisting Torque Dynamic modeling of the truck. Dynamic modeling can quickly grasp the relationship between the wheel side slip angle, kingpin inclination, reverse caster and steering system opposite rotary moment. Highlights the caster angle impact to the steering system opposite rotary moment, as the vehicle speed increases after the caster on the steering system opposite rotary moment. Also it introduced the process of the steering system opposite rotary moment of resistance. The steering system opposite rotary moment and ystem opposite rotary moment of resistance algebraically added to give a steering system opposite rotary moment model. Dynamic modeling can be initially estimated the current location parameters of the vehicle turning back positive performance, provide a theoretical basis for the analysis and experimental verification virtual.Then there is an brief introduction of vehicle dynamics system and related software, and then set up a major assembly according to the characteristics of the front axle leaf spring assembly assembly, front axle with shock absorbers, steering assembly, tire system assembly, body assembly and a drive axle assembly. And in accordance with the existing experimental data of automobiles Returnability test to the virtual vehicle model computing data, virtual comparative test data and analytical data for the model is analyzed qualitatively.After introducing the automobiles Returnability test methods and evaluation standards in the national standard "GB / T 6323.4-2014 Standard Test Method for vehicle handling and stability performance test positive turning back" briefly.We were carried out left automobiles Returnability test in 30 Km / h, right automobiles Returnability test in 30 Km / h, left automobiles Returnability test in 60 Km / h, right automobiles Returnability test in 30 Km / h in ADAMS. Comparison with the experimental results found that the vehicle steering automatically aligning long time history, the residual value of the yaw rate is large, especially in the low-speed test.Finally, from R & D and R & D cost efficiency considerations, we excluding the possibility of change other targeting parameters parametric to improve automobiles Returnability test performance of the vehicle but caster angle. we decision to changing the kingpin by increasing the leaf spring plate washer under way inclined to experiment. And based on the current test results and the results of the mathematical model, we identified two caster angle values to verify. Determined by virtual computing, analysis and test as a dip after truck design values one after the tilt value, This method has the practical effect in engineering.This paper through combining the mathematical model, the simulation model to establish and test methods That have an in-depth research on the problem that truck steering parameters how affecting steering performance. According to the principle of efficiency and cost control principles, the paper achieve vehicle parameter validation in a low-cost. With good engineering significance, The paper for the establishment of an integrated CAE analysis technology digital virtual product development process of the foundation.