An Efficient Assistance Tool for Evaluating the Effect of Tire Characteristics on Vehicle Pull Problem 2020-01-1237
The vehicle pull problem is very important to driving safety. Major factors that may cause the pull problem related to tire include variations of geometric dimension (eg.RPK) and stiffness (eg. cornering stiffness, Aligning stiffness), Plysteer and Conicity effect. In the previous research, the influencing mechanism of these factors were well studied.But in fact, vehicle pull problem caused by tire is probabilistic. When we assemble four tires onto the car, there would be 384 kinds of assembly arrangements. If we want to evaluate the pull performance of all these arrangements by real test, it will take a very long time, almost 24 working days, and along with a high test cost. Therefore, it is very needed to develop an assistant simulation tool that can evaluate the effect of tire characteristics on vehicle pull problem quickly. In this study, we improved the internal tire model of CarSim by introducing the Plysteer and Conicity effects of tires, and developed an analysis tool embedded in Carsim for the steering pull evaluation. This tool allows users to freely adjust the tire properties in each wheel position and quickly complete all probability simulation conditions. And furthermore, it also enables users to analyze the contribution of each related tire parameters to the steering pull problem. In order to verify the analysis results of this tool, three schemes of drift to left, to right and no drift were selected for test verification. The results show that the tool analysis results are in good agreement with the vehicle test results.
Lihong Sun, Dang Lu, Bing Li
GiTi Tire (China) R&D Center, Jilin University