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Modeling and Simulating Research of the Electric Power Steering System Control Performance

Author: LiZhenHua
Tutor: WangZengCai
School: Shandong University
Course: Vehicle Engineering
Keywords: Electric Power Steering Assist Characteristic Return control Test Bench
CLC: U463.4
Type: Master's thesis
Year: 2008
Downloads: 322
Quote: 12
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Abstract


Car steering system experienced a from purely mechanical steering system, hydraulic steering system, electro-hydraulic power steering system, until the to manipulate good performance of electric power steering system (Electric Power SteeringSystem, EPS), several stages of development. EPS system uses a the motor directly booster, booster size is controlled by the electronic control unit, compared to conventional hydraulic power system with high safety performance, adjustment convenient, environmentally friendly and energy-saving advantages, closely linked to the development of modern automotive theme is automotive steering systems development trend will gradually replace traditional hydraulic power steering system. Firstly, on the basis of the analysis of the basic principles of the EPS system, simplify the the EPS system dynamics model and describe its state space analysis of steady-state performance of the system and help follow the performance characteristics based on the dynamic model was built for this article The key components of the EPS system, such as sensors and motors made a preliminary selection. Summary of system control objectives based on control strategy is properly directly affect the performance of the EPS system, this paper analyzes the assist control back to the positive control and damping control three basic control methods, and to determine the timing of implementation of the various control mode . Assist control is the most basic control of the EPS system, this paper fuzzy neural network control of the assist characteristic curve has been optimized, the establishment of a new booster interpolation table, and back to the positive control and damping control algorithm analysis. In order to verify the theoretical analysis in MATLAB / SIMULINK environment, the establishment of the EPS system simulation model block assist control, back to the positive control and damping control the applied timing and control effect simulation, and summarizes the simulation results, which assist characteristic curve accelerated back positive, and increase the damping effect. The booster motor various control the last link in the implementation of its anti-jamming capability are higher, this paper H_ ∞ control program to abate the impact of the motor model uncertainties, to achieve the target tracking performance of the current. H_ ∞ control motor model and the model simulation analysis in the suppression of interference in the MATLAB / SIMULINK environment. Finally, the design of the bench test. Explore the features and requirements of the EPS test bench, with Taiwan rack mechanical part of the control system hardware and software parts selection, and finalize the test program. Take advantage of the built bench preliminary verify the above theoretical analysis, which laid the foundation for further development of the experimental study of the EPS system.

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