基于模型设计的电动助力转向系统策略研究

Study on the Strategy of EPS System Based on Model Design

为兼顾车辆转向轻便性和操纵稳定性,并提高车辆的燃油经济性,本文采用恩智浦32位MPC5634主控芯片,对基于模型设计的电动助力转向系统策略进行研究。通过Simulink/Stateflow搭建助力控制策略、回正控制策略及阻尼控制策略的仿真模型,通过功能性和结构性测试之后,自动生成嵌入式C代码,通过软件在环(software in-the-loop,SIL)进行仿真测试,并通过实车标定试验和转向试验,验证电动助力转向系统控制策略的有效性。试验结果表明,在车辆怠速工况下,开启电动助力转向系统时,转矩传感器的转矩信号与关闭电动助力转向系统时转矩传感器的转矩信号相比,转矩传感器输出的最大转矩信号AD值由210降至174,转矩差值由助力电机提供的转矩弥补,说明所开发的电动助力转向系统具有较明显的助力效果,能够满足设计需求。该研究具有较好的应用前景。

In order to take into account the vehicle steering lightness and control stability,reduce fuel consumption,this paper used NXP 32-bit MPC5634 microcontroller to study the Strategy of EPS System Based on Model Design.We build the Simulink/Stateflow control strategy model,carry out structural and functional tests,generate embedded code and verify through the SIL(software in-the-loop)test.Then,we verify the effectiveness of the electric power steering system control strategy through real vehicle calibration test and steering test.The test results show that when the electric power steering system is turned on,the torque signal of the torque sensor is compared with that of the torque sensor when the electric power steering system is turned off,the maximum torque signal AD value of the torque sensor is reduced from210 to 174,and the torque difference is compensated by the torque provided by the booster motor.It shows that the developed electric power steering system has obvious power assist effect and can meet the design requirements.This research has a good application prospect.