重庆理工大学学报(自然科学) ›› 2023, Vol. 37 ›› Issue (12): 1-8.

• 汽车工程 •    下一篇

线控转向电机自抗扰伺服控制系统研究

刘军, 顾洪钢, 刘皓皓, 戴昂   

  1. 江苏大学汽车与交通工程学院
  • 出版日期:2024-02-04 发布日期:2024-02-04
  • 作者简介:刘军,男,博士,教授,主要从事汽车电子研究,E-mail:Liujun@ujs.edu.cn;通信作者 顾洪钢,男,硕士,主要从事线控转向系统研究,E-mail:1184531817@qq.com

Research on auto-disturbance rejection servo control system of steering-by-wire motor

  • Online:2024-02-04 Published:2024-02-04

摘要: 选择永磁同步电机作为转向电机,研究基于自抗扰控制器的电机伺服控制技术。首先,对永磁同步电机在旋转交直轴坐标系下的数学模型进行介绍,选择转子磁场定向矢量控制策略。其次,将电机位置、速度环整合,设计了一个二阶自抗扰控制器,减少电机内外扰动的影响,抗干扰能力较PID控制器有较大提升。针对二阶自抗扰控制参数众多、调节困难的问题,利用模糊算法对自抗扰控制器的非线性状态反馈控制器参数进行优化,设计了永磁同步电机伺服控制系统位置速度模糊自抗扰控制器。最后,在Simulink中搭建电机控制模型并进行仿真分析,验证本文中控制策略以及算法优越性。

关键词: 永磁同步电机, 自抗扰控制, 模糊控制, 伺服控制, Matlab/Simulink

Abstract:

Presently, with the rapid development of control technology and electronics, automobile intelligence and electronization have become the mainstream trend. The steer-by-wire system cancels the mechanical connection of the traditional steering system, and transmits the driving intention to the steering actuator through the bus, which facilitates the overall layout of the steering system, while optimizing the steering characteristics of the car and further improving the handling stability of the car. Meanwhile, steering by wire is also a key technology for automatic driving to achieve vehicle path tracking and obstacle avoidance.

The main function of the steer-by-wire system is to follow the wheel angle to the steering wheel angle, which requires the steering motor to track the steering wheel angle quickly and accurately. In the meantime, the steering executive motor entirely supplies the driving force for wheel response to the driving intention in the steer-by-wire system. The control of the steering motor serves as the core of the whole control system, determining the quality of the steering performance. This paper focuses on formulating a steering motor control algorithm in line with the steer-by-wire system, aiming to achieve the driver’s steering intention.

Most of the current steer-by-wire systems use brushed DC motors and brushless DC motors as road sense motors and steering motors. Among them, the brushed DC motor is low in power density, easy to spark and has short service life, and when high-power commutation. Brushless DC motor achieves long service life, but has poor low-speed performance, which affects the driver’s driving feel when steering. Although the control of Permanent Magnet Synchronous Motor (PMSM) is more complicated, it has the advantages of high power density, small rotation pulsation, good low-speed performance and long service life, and is suitable for wire control steering motor. However, PMSM is a strong coupling and nonlinear time-varying system. Traditional PID control has its own limitations and weak anti-interference ability, making it difficult to achieve the desired control in PMSM servo control systems. To overcome the weaknesses of PID control strategy, an Active Disturbance Rejection Controller (ADRC) is proposed as a replacement in the speed loop of the PMSM servo control system. ADRC technology is a new control theory proposed by Prof. Han Jingqing based on PID control and modern control theory, resolves the contradiction between overshoot and rapidity in PID control through real-time observation, estimation, and compensation of the input signal transition process and the total internal and external disturbance during system operation. This not only mitigates the defects of PID control but also enhances the system’s anti-interference capability.

This paper designs a motor servo control strategy based on Active Disturbance Rejection Controller. First, the paper builds a mathematical model of the permanent magnet synchronous motor in the rotating alternating axis coordinate system, adopting the rotor magnetic field directional vector control strategy. Second, a second-order Active Disturbance Rejection Controller is designed to mitigate the impact of both internal and external motor disturbances, significantly enhancing its anti-interference capabilities when compared to the PID controller. Addressing the challenges of adjusting parameters for the second-order Active Disturbance Rejection Control, this paper employs fuzzy algorithm to optimize the parameters of nonlinear state feedback controller of ADRC, and designs the position velocity Fuzzy-ADRC of PMSM servo control system. Finally, a motor control model is built in Simulink and a simulation analysis is performed. The control strategy not only overcomes the contradiction between overshoot and rapidity in the controller, but also improves the control precision and anti-interference ability of the whole system. The superiority of the control strategy and algorithm outlined in this paper is verified through simulation.

中图分类号: 

  • U491.6