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A Study on Sliding Mode Control for Active Suspension Systems

BYD Auto Co., Ltd.-Pu Xu
South China University of Technology-Wu Qin, Wen-Bin Shangguan, Huayuan Feng, Yi Sun
  • Technical Paper
  • 2020-01-1084
To be published on 2020-04-14 by SAE International in United States
A sliding mode control with a disturbance observer is proposed for suppressing the sprung mass vibration in a quarter-car with double-wishbone active suspension systems (ASSs). The suspension structure containing upper and lower control arms is considered in double-wishbone ASSs. The governing equations of ASSs are obtained by the balance-force analysis of the sprung mass in ASSs. Since ASSs include uncertainties in damping, stiffness, and external disturbance acting on the sprung mass, we design a disturbance observer based on a sliding mode control to estimate these uncertainties under the unknown road excitation. By the Lyapunov minimax approach, the uniform boundedness and the uniform ultimate boundedness for ASSs with the proposed control are proved. The efficacy of the design control is verified through co-simulation of ADAMS software and MATLAB/Simulink software for the road excitation of the step displacement. The sprung mass acceleration of ASSs is obtained with and without the proposed control. The results show that ASSs with the proposed control can yield better riding comfort performance of vibration attenuation of the sprung mass. Furthermore, the effects…
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Modeling and Validation for the Hysteretic Behavior of an Automatic Belt Tensioner

BYD Auto Industry Company Limited-Pu Xu
South China University of Technology-Shangbin Long, Xuezhi Zhao, Wen-Bin Shangguan
Published 2019-06-05 by SAE International in United States
An automatic tensioner used in an engine front end accessory drive system (EFEADS) is taken as a study example in this paper. The working torque of the tensioner, which consists of the spring torque caused by a torsional spring and the frictional torques caused by the contact pairs, is analyzed by a mathematic analysis method and a finite element method. And the calculation and simulation are validated by a torque measurement versus angular displacement of a tensioner arm. The working torques of the tensioner under a loading and an unloading process are described by a bilinear hysteretic model, and are written as a function with a damping ratio. The rule of the action for the damping devices is investigated based on the simulation and a durability test of the tensioner. A finite element method for the tensioner without damping device is established. Then the radial deformation for the torsional spring under an unconstrained state is obtained. The analysis results have a good correlation with the measurements. The method presented in this paper is beneficial for…
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