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The Study and Development of Electric Power-assisted Steering System Based on Fuzzy Control

Author: WangXiongBo
Tutor: YuQunMing
School: Hunan University
Course: Mechanical and Electronic Engineering
Keywords: Electric Power Steering Assist Characteristic Fuzzy Control An electronic control unit
CLC: U463.4
Type: Master's thesis
Year: 2008
Downloads: 427
Quote: 18
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Abstract


Automotive electronics is the inevitable trend of development of automotive technology . Following the electronic technology is widely used in the engine, transmission , brakes and suspension systems , domestic and foreign cars and light vehicles with electric power steering ( Electric Power- assisted Steering EPS ) system is gradually replacing the traditional hydraulic power steering system . Electric power steering system uses a motor directly provide the impetus to boost size is controlled by the electronic control unit (ECU) , with the help resizable good road feel , environmental protection , energy saving and convenient maintenance , the research focus and cutting-edge of automotive technology development technology. The paper first discusses the characteristics of the EPS system , working principle and structure , a detailed description of the EPS system 's key components , such as torque sensor , motor and electronic control unit , which provided the basis for the system development and component selection . Then from the the assist characteristic and control strategies both EPS system a thorough and meticulous research . Designed based on the current decision - making method of the fuzzy control motor power obtained under the different vehicle speed and steering wheel torque input the assist characteristic curve , the curve shows that the power control strategy based on fuzzy control is in line with the actual EPS system in steering the process of booster requirements ; , and improve vehicle driving comfort and handling stability of the steering damping control and return control strategies are discussed . On this basis , the establishment of the the EPS system simulation model , design of motor current PID and adaptive fuzzy PID controller . Simulation results show that the current controller with high response speed and a good tracking target current , the boost control strategy developed and current control method can well meet the actual requirements of the steering system . Finally , given the set of EPS systems ECU hardware design , the details of the three modes of operation corresponding permanent magnet brushless DC motor drive circuit and the motor with the EPS system control strategy . According to the functional requirements of the EPS system , given the composition of the ECU software and work flow chart . The content of the research as the the EPS system development provides an important theoretical basis and design methods , a practical guide .

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