PMSM Servo Drive System for Electric Power Steering Based on Two-Degree-of-Freedom Torque Control

In order to solve the torque control problem in electric power steering using induction motor,the system mathematical model was established and the impact on the torque control caused by the variation of rotor resistance was analyzed. Using feed-forward and feedback integrating control and on-line resistance identification to improve the accuracy of torque control and current tracking response. Simulation comparisons showed that the proposed method could significantly improve the current response speed and accuracy in induction motor control of electric power steering system.

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Torque Control of Electric Power Steering Systems Based on Improved Active Disturbance Rejection Control

Mathematical Problems in Engineering ◽

10.1155/2020/6509607 ◽

2020 ◽

Vol 2020 ◽

pp. 1-13 ◽

Cited By ~ 2

Author(s):

Shaodan Na ◽

Zhipeng Li ◽

Feng Qiu ◽

Chao Zhang

Keyword(s):

Electric Power ◽

Control Method ◽

Low Frequency ◽

Torque Control ◽

Steering Wheel ◽

Electric Power Steering ◽

Power Steering ◽

Wheel Torque ◽

Steering Torque ◽

The Impact

In the electric power steering (EPS) system, low-frequency disturbances such as road resistance, irregular mechanical friction, and changing motor parameters can cause steering wheel torque fluctuation and discontinuity. In order to improve the steering wheel torque smoothness, an improved torque control method of an EPS motor is proposed in the paper. A target torque algorithm is established, which is related to steering process parameters such as steering wheel angle and angular speed. Then, a target torque closed-loop control strategy based on the improved ADRC is designed to estimate and compensate the internal and external disturbance of the system, so as to reduce the impact of the disturbance on the steering torque. The simulation results show that the responsiveness and anti-interference ability of the improved ADRC is better than that of the conventional ADRC and PI. The vehicle experiment shows that the proposed control method has good motor current stability, steering torque smoothness, and flexibility when there is low-frequency disturbance.

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Electromagnetic torque control for synchronous reluctance motor servo-drive system applied in continuously variable transmission system

International Journal of Applied Electromagnetics and Mechanics ◽

10.3233/jae-180079 ◽

2020 ◽

Vol 62 (2) ◽

pp. 355-382 ◽

Cited By ~ 1

Author(s):

Chih-Hong Lin ◽

Kuo-Tsai Chang

Keyword(s):

Continuously Variable Transmission ◽

Transmission System ◽

Drive System ◽

Torque Control ◽

Electromagnetic Torque ◽

Servo Drive ◽

Synchronous Reluctance Motor ◽

Reluctance Motor ◽

Variable Transmission ◽

Servo Drive System

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Oscillation in Electric Power Steering Test Torque Due to Universal Joint Angle and Control Strategy

Journal of Dynamic Systems Measurement and Control ◽

10.1115/1.4024476 ◽

2013 ◽

Vol 135 (5) ◽

Cited By ~ 2

Author(s):

Zhong-Xing Yang

Keyword(s):

Electric Power ◽

Control Strategy ◽

Angular Acceleration ◽

Target Position ◽

Torque Control ◽

Load Test ◽

Target Point ◽

Electric Power Steering ◽

Test Load ◽

Power Steering

To perform torque load test on an active EPS (electric power steering) system, the EPS column is required to make a user-defined angular displacement under a user-defined test load applied at the end of the pinion shaft. As universal joints are used in the EPS system for spatial arrangement, the angular velocity and torque on the driven shaft vary twice from those on the driving shaft in one rotation circle. This introduces a fluctuation in the velocity and torque on the driven shaft at a frequency twice that of the shaft rotation. The angular acceleration of the pinion shaft exerts on the coupling an inertia load which prevents the required load from precise transmission. To eliminate the oscillatory deviation in the test load applied at a target position in a multibody rotation system while not changing the shafts axes angle arrangement, a control strategy based on a proportional integral derivative controller (PID) with compensation using rotary acceleration feedback, newly developed for torque control, is discussed in this paper. The load control at a target point is achieved by modifying the torque input with a compensation signal to cancel out the oscillatory deviation in the test load.

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