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Research and Realization of Return-to-center & Damping Control Strategy for Electric Power Steering System

Author: HuangZhengDan
Tutor: LiuHePing
School: Chongqing University
Course: Electrical Engineering
Keywords: Electric Power Steering Return control Damping Control Kalman filter Simulation
CLC: U463.4
Type: Master's thesis
Year: 2011
Downloads: 121
Quote: 0
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Abstract


Over the past decade, the electric power steering system (Electric Power Steering EPS) become standard due to its advantages of energy-saving, environmental protection, active safety and good handling stability, more and more types of vehicles; their control The model has control from the initial boost to the development of back positive, damping and compensation control mode, and further strengthen its function. The domestic control strategy focused on assist control back to the positive control and damping control, and back to the positive control, and high-speed damping control to manipulate the stability and security of traveling steering process has an important impact . In view of this situation, the paper selection column assist type EPS system as an object of study, the EPS system back to the positive control and damping control strategy for the exploration and study. The paper first describes the development of the EPS system to establish, on the basis of the analysis of EPS system structure and working principle and a variety of different control modes, the EPS system dynamics model and electrical model, as well as car with two degrees of freedom model and tire resistance model lay the foundation for the control of strategic research and simulation analysis. Paper back to the positive control strategies and damping control strategy analysis and research. Return control strategy back positive and active damping control combined control method, the design of a steering wheel angle observer, as the target amount of control back to the positive control, to improve vehicle at low speed back to the steering wheel angle back positive process is inadequate and high-speed back positive overshoot conditions; put forward a four-quadrant damping control strategy, in order to provide different damping torque motor corner to control the amount of reverse current is applied to the booster motor to achieve the different vehicle speed and steering conditions, to improve the car high-speed manipulation stability and steering road feel; road vehicle was random interference and sensor noise EPS control system, the Kalman filter is used to filter out interference and noise signal to improve the anti-interference ability of the EPS control system . The papers using Matlab / Simulink software to build the EPS system back to the positive control and damping control simulation model and Kalman filter-based signal processing simulation model based on the mathematical model of the system, and simulation analysis. The simulation results show that the design back to the positive control correctness and effectiveness of the strategy and damping control strategy, the feasibility of the Kalman filtering method to improve the EPS control system anti-interference ability. Hardware and software design, the use of control methods applied boost torque and reverse damping torque combination switch, change the existing back control method, back to the positive torque is not controlled; damping is controlled by applying a reverse moment of resistance method to change the traditional damping control in motor short circuit method causes the damping torque is limited; hardware design including the motor drive circuit, input output interface circuit; software including back to the positive control, damping control, AD sampling and interrupt. The EPS test bench back and damping control strategy and Kalman filtering method validation, and the results show that the design of the control system to achieve the expected results.

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CLC: > Transportation > Road transport > Automotive Engineering > Automotive structural components > Steering system
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