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Simulation Study of Vehicle Dynamics Control Based on Suspension System

Author: FuZhen
Tutor: XuCangSu
School: Zhejiang University
Course: Vehicle Engineering
Keywords: Semi-active control Sliding Mode Control Coordinated control Electrorheological Simulation
CLC: U463.33
Type: Master's thesis
Year: 2010
Downloads: 143
Quote: 0
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Abstract


In recent years, a variety of electronic control technology to improve the car ride , handling and stability and security , a huge development and a wide range of applications , research -based suspension control chassis dynamics to improve the overall performance of the car has a very important significance. This paper first analyzes road roughness and time domain simulation calculation of the advantages derived road random excitation time domain equation . On the basis of the basic characteristics of the introduction of ER fluids , it is proposed that the current variable damping suspension - based semi- active control strategy , and the establishment of a 1 / 4 , 1 / 2 , and the vehicle 's vehicle dynamics model . According to the sliding mode control theory , pole placement design of switching hyperplane switching control method to model applications proportion of 1/4 to determine the control rate , and RBF neural network optimized effective control switch items , 1 / 2 and vehicle model were used to sequence start hierarchical algorithm and freedom hierarchical method of sliding mode variable structure controller design , the control effects of the suspension of the performance of the system in the random excitation conditions , results This design of sliding mode controller performance and stable control of the rear suspension performance parameters are significantly improved in the time domain and frequency domain , confirmed the validity of a semi- active suspension sliding mode controller design . At present, many of the electronic control system is only optimized vehicles during a performance , without considering the vehicle is in the process of moving between the various subsystems of mutual influence and mutual interference , the suspension system is included in the coordinated control of vehicle dynamics among the sliding mode control strategy coordination controller design a semi - active suspension and anti-lock braking system , the simulation results show that the designed controller can not only effectively prevent the wheels from locking , significantly shorten braking distance and made Activity time, and also can improve the braking of the occupant's comfort, and to improve the overall performance of the car . Coordination of vehicle chassis control is an important direction for future automotive control development .

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CLC: > Transportation > Road transport > Automotive Engineering > Automotive structural components > Travel System > Suspension
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