基于主动转向干预的EPS系统转向盘力矩突变修正策略

摘要

在研究融合主动转向功能的电动助力转向系统实现原理的基础上,分析转向系统的力矩和角位移传递特性.针对主动转向干预时转向盘力矩发生突变的问题,提出一种适用于全车速范围的助力电机前馈助力修正策略.为验证所提出的前馈助力修正策略的修正效果,进行主动转向干预时转向盘力矩阶跃仿真试验.仿真结果表明:该策略有效地削弱了伴随主动转向干预同时出现的转向盘力矩突变,且在高速时该修正策略仍然有效,改善了主动转向干预时转向系统的转向路感.%Implementation principle of an electric power steering (EPS) system integrated with active steering function is researched based on which transfer characteristics of torque and angle displacement for steering system are analyzed. To avoid mutations of steering wheel torque during the interference of active steering, a feed-forward assistant torque correction strategy for assist motor is presented? which can be used in the whole speed range. To verify the performance of the proposed correction strategy, step simulation tests of steering wheel torque during the interference of active steering are carried out. Simulation results indicate that mutations of steering wheel torque are reduced, the correction strategy can still be effective at high speed, and steering sense of the steering system during the interference of active steering is improved.