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Research and Design of Vehicle EPS System

Author: ZhangChunHu
Tutor: MaJian
School: Chang'an University
Course: Vehicle Engineering
Keywords: EPS Booster motor Assist Characteristic PID Fuzzy Control Simulation
CLC: U463.4
Type: Master's thesis
Year: 2011
Downloads: 123
Quote: 3
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Abstract


The theme of the era of energy-saving and environmental protection, the steering system as an important part of the car , should be closely linked with the themes of the times . Therefore , the electric power steering system (Electronic Power Steering EPS ) have come into being . EPS relative to conventional hydraulic power steering system more secure , better comfort, more convenient maintenance , most importantly, is more energy-efficient , more environmentally friendly , it is an inevitable development trend of the future of automotive steering system . The research object of this paper is to EPS. Basis to do in-depth research and analysis of the course of development of automotive steering systems and development status at home and abroad , to simplify the structure of the EPS , draw the diagram , the various components and figure studies EPS dynamics mathematical model and analysis , and to establish the mathematical model of the mathematical model of the tire and the booster motor and transfer function model to lay the foundation for the back to create a simulation model in MATLAB / SIMULINK . In order to facilitate the determination of the behind the establishment of the simulation model and the output value of the papers selected a specific model parameters as a basis to determine the booster motor rated torque , rated voltage , rated current and rated power parameters . Assist characteristic curve in order to determine the target of the booster motor current , do the research and analysis , and eventually decided to adopt the goal of the current fuzzy control strategy to control the booster motor armature , also studied two of the booster motor control strategy , namely conventional PID adaptive PID control and fuzzy control . Subsequently establish its mathematical model according to the dynamics of the front of the EPS simulation model to determine the target current trends change with the change of the torque and speed , and to verify the feasibility of the fuzzy controller and the target current conventional PID controller and fuzzy self adapt to the PID controller , respectively, under the action of a follower , and can be verified by simulation using fuzzy adaptive PID control is better than the conventional PID control .

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