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Analysis of the Dynamic Performance of an Engine Front End Accessory Drive System with an Asymmetric Damping Tensioner

Ningbo Fengmao Far-East Rubber Co., Ltd.-Weijun Zhao
South China University of Technology-Bo Zhou, Wen-Bin Shangguan, Shangbin Long, Yi Sun
  • Technical Paper
  • 2020-01-0409
To be published on 2020-04-14 by SAE International in United States
The automatic tensioner is an important component of the engine front end accessory drive system (EFEADS). It maintains the tension of the belt steadily and reduces the slip of pulley, which is benefit for improving the life of V-ribbed belt. In this paper, an EFEADS model is established which is considering with the hysteretic behavior and the asymmetry of friction damping of a tensioner. A four-pulley EFEADS is taken as a study subject. The dynamic responses of system, such as the oscillation angle of each pulley, the slip factor of pulley, the oscillation of tensioner arm and the dynamic belt tension are analyzed with symmetric damping and asymmetric damping tensioner. Meanwhile, the influence of asymmetric damping factors of tensioner on the dynamic response of EFEADS is also investigated. The experimental results show that tensioner with an asymmetric damping can effectively reduce the oscillation angle of each pulley and the oscillation of tensioner arm, and the fluctuation of dynamic belt tension.
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A Study on Sliding Mode Control for Active Suspension System

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
Sliding mode control with a disturbance observer (SMC-DO) is proposed for suppressing the sprung mass vibration in a quarter-car with double-wishbone active suspension system (ASS), which contains the geometry structure of the upper and lower control arms. The governing equations of double-wishbone ASS are obtained by the balance-force analysis of the sprung mass in ASS. Considering uncertainties in damping, stiffness, and external disturbance acting on the sprung mass, we design a disturbance observer based on a sliding mode control (SMC) to estimate these uncertainties under the unknown road excitation. By the Lyapunov minimax approach, the uniform boundedness and the uniform ultimate boundedness of ASS with the proposed control are rigorously proved. Through co-simulation of ADAMS software and MATLAB/Simulink software, the sprung mass acceleration of ASS can be obtained with and without the proposed control. The results show that ASS with the proposed control can yield better riding comfort performance of vibration attenuation of the sprung mass, which verifies the effectiveness of the proposed approach. Furthermore, the effects of external disturbance and control parameter in the…
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Analysis for Dynamic Performances of Engine Front End Accessory Drive System under Accelerating Condition

Ningbo Fengmao Far-East Rubber Co.,Ltd-Weijun Zhao
South China University of Technology-Chujian Lin, Shangbin Long, Yi Sun, Wen-Bin Shangguan
  • Technical Paper
  • 2020-01-0399
To be published on 2020-04-14 by SAE International in United States
A model for a generic layout of an engine front end accessory drive system is established. The dynamic performances of the system are obtained via a numerical method. The dynamic performances consist of the oscillation angle of tensioner arm, the slip ratio of each pulley and the dynamic belt tension. In modeling the system, the hysteretic behavior of an automatic tensioner, the loaded torque of the accessory pulley versus the engine speed, the torsional vibration of crankshaft and the creep of the belt are considered. The dynamic performances of the system at steady state and under accelerating condition are analyzed. An example is provided to validate the established model. The measured results show that the torsional vibration of crankshaft is larger and the dynamic performances of the system are different under accelerating conditions, though the acceleration is small. In the end, the dynamic performances of the system using different belts with different Young’s modulus are studied by the established model.
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Modeling and Analysis of Front End Accessory Drive System with Overrunning Alternator Decoupler

Ningbo Fengmao Far-East Rubber Co.,Ltd-Weijun Zhao
South China University of Technology-Zhonghui Yin, Shangbin Long, Yi Sun, Wen-Bin Shangguan
  • Technical Paper
  • 2020-01-0398
To be published on 2020-04-14 by SAE International in United States
The generator is an important loaded component of an engine front end accessory drive system (EFEADS). With a huge moment of inertia and a highest running speed, the vibration and noise often occurs in operation, which has an effect on the service life. Thus an overrunning alternator decoupler (OAD) is used in the EFEADS for reducing the vibration of system. In this paper, a model of EFEADS with an OAD is established. The impact of the OAD on the dynamic responses of pulley of generator and the system are analyzed, and is verified by bench experiments. And the influence of parameters, such as spring stiffness, moment of inertia of generator and loaded torque on the dynamic performances of the system are studied. The influence of misalignment in pulleys on the dynamic performance of system is also discussed. The presented method is useful for optimizing the dynamic performance of system, such as the oscillation of tensioner arm and the slip ratio of the belt-generator pulley.