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Dynamic Characteristic and Hardware-in-loop Simulation Research for Automobile Electric Power Steering System

Author: ZhangJunHui
Tutor: DengZhaoXiang
School: Chongqing University
Course: Vehicle Engineering
Keywords: Electric power steering system (EPS) Dynamic characteristic Control strategy Loop simulation Test-bed rack
CLC: U463.4
Type: Master's thesis
Year: 2011
Downloads: 73
Quote: 0
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Abstract


Automotive steering systems affect vehicle handling and stability, active safety and comfort of the key components, car lateral dynamics of the major research topics. The electric power steering system (EPS) has become the focus of power steering technology research due to its energy-saving, environmental protection, superior handling performance and steering feel characteristics. Abroad EPS system has a more mature domestic R \u0026 D is still in the initial stage, China's automobile industry urgently needed research and development of this high-tech products, therefore, it is necessary to conduct research and development of this steering system. In-depth analysis of the dynamic characteristics of the EPS system, and EPS product development for the purpose of the loop simulation technology research, the main contents are as follows: the establishment of a nonlinear dynamical model of the EPS system; detailed analysis of the steering resistance rectangle into mechanism and characteristics, combined with nonlinear Magic Formula semi-empirical tire model, three degrees of freedom vehicle model, to establish a more perfect overall system dynamics model. Back to light-steering, steering, steering sensitivity, steering feel and handling and stability as an EPS system performance evaluation. EPS steering sensitivity and steering feel to study the dynamic characteristics of the response in the frequency domain, the transfer function derived steering sensitivity and steering feel, the EPS system response characteristics of frequency domain of steering sensitivity and steering feel. The impact and effects of the EPS system parameters affect these two performance. Three common booster characteristic curve based on the design of a linear boost characteristics curve, to help control and back help determine motor current positive control, steering wheel angle signal to determine control mode switching; PID control algorithm tracking target current simulation The results show that the track to good effect. EPS system and model of the vehicle steering system and control strategy based on MATLAB \\ Simulink platform, build a simulation model. Through the the EPS system time-domain response characteristics from the steering portability, turning back to the positive, steering sensitivity, steering feel and handling stability of the five evaluation analysis of the dynamic characteristics of EPS system. Studies have shown that the design of the control strategy EPS system has good dynamic characteristics, low-speed steering portability and high-speed steering feel and good steering sensitivity performance, turning back to the positive performance and improve the steering stability. Finally, on the basis of the analysis of the existing bench, bench test design and loop simulation technology to build a the EPS system loop simulation hardware and software platform, EPS performance and control strategy for further development of research, product development and The test laid a foundation.

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