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

2020 ◽  
Vol 2020 ◽  
pp. 1-13 ◽  
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.

A New Control Strategy to Reduce Steering Torque Without Perceptible Vibration for Vehicles Equipped With Electric Power Steering

2010 ◽  
Vol 132 (5) ◽  
Author(s):  
Masahiko Kurishige ◽  
Osamu Nishihara ◽  
Hiromitsu Kumamoto
Keyword(s):  
Angular Velocity ◽  
Electric Power ◽  
Control Strategy ◽  
Steering Wheel ◽  
Velocity Control ◽  
Steering Control ◽  
Electric Power Steering ◽  
Power Steering ◽  
Wide Range ◽  
Steering Torque

This paper proposes a new electric power steering control strategy, which significantly reduces the effort needed to change the steering direction of stationary vehicles. Previous attempts to reduce undesirable steering vibration have failed to reduce the steering torque because high-assist gains tend to produce oscillation or increase noise sensitivity. Herein, to eliminate this vibration, a new control strategy was developed based on pinion angular velocity control using a newly developed observer based on a simplified steering model. Tests yielded excellent estimations of the pinion angular velocity, and this made it possible to eliminate vibration at all steering wheel rotation speeds. Experiments with a test vehicle confirmed significant steering torque reduction, over a wide range of steering wheel speeds, without vibration transmission to the driver. The proposed control strategy allowed use of an assist gain more than three times higher than is conventional. Additionally, the proposed control strategy does not require supplemental sensors.

scholarly journals Active Return-to-Center Control Based on Torque and Angle Sensors for Electric Power Steering Systems

2018 ◽  
Author(s):  
Pan-Pan Du ◽  
Hao Su ◽  
Gong-You Tang
Keyword(s):  
Electric Power ◽  
Control Method ◽  
Sudden Change ◽  
Steering Wheel ◽  
Vehicle Speed ◽  
Electric Power Steering ◽  
Complete Control ◽  
Power Steering ◽  
State Switching ◽  
Active Return

This paper presents a complete control strategy of the active return-to-center (RTC) control for electric power steering (EPS) systems. We first establish the mathematical model of the EPS system and analyze the source and influence of the self-aligning torque (SAT). Second, based on the feedback signals of steering column torque and steering wheel angle, we give the trigger conditions of a state switch between the steering assist state and the RTC state. In order to avoid the sudden change of the output torque for the driving motor when the state switches frequently between the steering assist state and the RTC state, we design an undisturbed state switching logic algorithm. This state switching logic algorithm ensures that the output value of the RTC controller is set to an initial value and increases in given steps up to a maximum value after entering the RTC state, and the output value of the RTC controller will reduce in given steps down to zero when exiting the RTC state. This therefore ensures smooth switch control between the two states and improves the driver’s steering feeling. Third, we design the RTC controller, which depends upon the feedback signals of the steering wheel angle and the angular velocity. In addition, the controller increases the auxiliary control function of the RTC torque based on vehicle speed. The experimental results show that the active RTC control method does not affect the basic assist characteristics, which effectively reduces the residual angle of the steering wheel at low vehicle speed and improves the RTC performance of the vehicle.

Improvement of Torque Control in EPS Using Induction Motor

2013 ◽  
Vol 461 ◽  
pp. 513-518
Author(s):  
Fei Xiang Zhao ◽  
Jian Wei Zhang ◽  
Kong Hui Guo ◽  
Li Hao Zhang
Keyword(s):  
Electric Power ◽  
Induction Motor ◽  
Response Speed ◽  
Steering System ◽  
Torque Control ◽  
Current Response ◽  
Electric Power Steering ◽  
Power Steering ◽  
Electric Power Steering System ◽  
The Impact

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.

Calibration and Evaluation of Steering Wheel Torque Signal for EPS System

2014 ◽  
Vol 577 ◽  
pp. 429-433
Author(s):  
Yu Kuan Sun ◽  
Wang Hao ◽  
Xiao Jie Duan ◽  
Chen Hu Yuan ◽  
Jian Ming Wang
Keyword(s):  
Electric Power ◽  
Software Design ◽  
Evaluation System ◽  
Electromagnetic Compatibility ◽  
Detection System ◽  
Steering Wheel ◽  
Electric Power Steering ◽  
Power Steering ◽  
Wheel Torque ◽  
Vehicle Security

Electric power steering (EPS) uses an electric motor to assist the driver when he or she is driving, and the amount of assistance to be applied depends on steering wheel torque and driving conditions. So steering wheel torque is one of the most important signals which keep the EPS system working properly, and a steering wheel torque fault could be a disaster for whole vehicle security. The aim of this paper is to design a calibration and evaluation system of torque signal, which is utilized for function detection of steering wheel torque module in EPS systems. Firstly, the detection procedure is proposed according to detection requirement; Then hardware structure and software design of the detection system are introduced. Finally, an EMC (Electromagnetic Compatibility) problem is analyzed and a solution for the EMC problem is proposed to make the detection system working properly.

Robust steering-assist torque control of electric-power-assisted-steering systems for target steering wheel torque tracking

Mechatronics ◽  
2018 ◽  
Vol 49 ◽  
pp. 157-167 ◽  
Author(s):  
Dongpil Lee ◽  
Kyongsu Yi ◽  
Sehyun Chang ◽  
Byungrim Lee ◽  
Bongchoon Jang
Keyword(s):  
Electric Power ◽  
Torque Control ◽  
Steering Wheel ◽  
Wheel Torque
Sign in / Sign up

Export Citation Format

Share Document