Abstract: Vehicle running off is a common failure mode that affects vehicle performance. According to the vehicle running and deviation characteristics, three stages of pull drift compensation (PDC) function scene identification, compensating torque calculation and PDC compensating torque output are proposed. The test indexes time to drift (TTD) and torque to track (TTT) are included into the performance indexes of PDC function acceptance. The contribution of PDC function to the optimization of deviation problem is expounded and demonstrated, which has certain engineering application value.

Key words: Electric power steering system; PDC; Run off

摘要： 车辆行驶跑偏问题一种常见的影响车辆使用性能的失效模式，文章根据车辆行驶跑偏 特性，提出拉拽补偿（PDC）功能场景识别、补偿扭矩计算及 PDC 补偿扭矩输出三个阶段， 并将跑偏考核指标偏移时间（TTD）和保舵力（TTT）纳入 PDC 功能验收性能指标。阐述并 论证 PDC 功能对跑偏问题优化的贡献，具有一定的工程应用价值。

关键词: 电动助力转向系统；PDC；行驶跑偏