Research On Key Issues Consistence Analysis Of Vehicle Steering Characters

The quality of vehicle becomes much more important with the development of the automotive industry. A good consistency means a high quality of the vehicle. Consistency and durability are two main problems for Chinese automotive industry to compete with foreign companies. There are two aspects of the performance of consistency. One is that the characteristics of many vehicles are much more different to the design characteristics. The other is that the characteristics of one car may be very different from the design characteristics after some time. The traditional method is using the precision equipment to ensure the consistency which causes the high cost.It attempts to establish a new process of consistency design during the concept design. Firstly, makes the vehicle performance indicators above the average level to get a tolerance. Then, deliver the tolerance to the design parameters of the vehicle. So the tolerance of design parameters can be received and the consistency can be guaranteed. With the tolerance of the design parameters, the manufacturers and suppliers can choose the equipment to make the cost under‐control.After a detailed review on domestic and foreign thesis, some key issues on consistency design are addressed. From the view of difficult points of the research, the following works are researched.A3‐step consistency design process is established after the analysis of its5key issues.Relating and coupling degree analysis method between vehicle performance parameters and design parameters is researched based on the DOE thesis. First, make the parameters sensitivity analysis one by one system. Second, put all system parameters chosen together to make parameter sensitivity analysis again. Finally, put the performance parameters and design parameter chosen together to analysis the relating and coupling degree.Parameter modeling expression method is established. It provides the mathematics expression models for the points, characters of plane curves and space surfaces. It also provides the model for the tolerance of all the parameters.Target characters tolerance delivery theory is established by the interval Taylor and Generalized inverse matrix theory in the thesis.The steering quality dynamics model is established. It can reflect the robustness andstability of the vehicle which is important to the consistency analysis.Finally, the steering performance indicators are chosen as the starting point to validate the steering consistence analysis process.