某非承载式SUV制动跑偏故障分析

Analysis of Brake Deviation Fault in a Non load Bearing SUV

针对某非承载式SUV在道路试验过程中发生的制动右偏现象,分析导致制动右偏的各种因素,排查制动系统、转向系统、悬架参数和零部件以及车架精度后,发现左下摆臂安装点位置精度超出设计公差。然后将故障车辆前悬架的硬点带入ADAMS模型进行仿真分析,仿真分析结果与故障车辆制动跑偏方向一致,确认真因为悬架安装点位置精度不满足设计要求。通过深入调查发现是由于车架横梁在生产过程中缺少工装,导致车架精度较差,后续车架生产过程中增加工装约束,保证车架精度,解决了制动跑偏问题。

In response to the braking right deviation phenomenon of a non load bearing SUV during road testing,various factors causing braking right deviation were analyzed.After investigating the braking system,steering system,suspension parameters and components,as well as the accuracy of the frame,it was found that the installation point accuracy of the left lower swing arm exceeded the design tolerance.Then,the hard points of the front suspension of the faulty vehicle were brought into the ADAMS model for simulation analysis.The simulation analysis results were consistent with the brake deviation direction of the faulty vehicle,confirming that the true cause of the malfunction is that the suspension installation point accuracy did not meet the design requirements.Through in-depth investigation,it was found that the lack of tooling during the production process of the frame crossbeam resulted in poor frame accuracy.In the subsequent frame production process,tooling constraints were added to ensure frame accuracy and solve the problem of brake deviation.