• CN: 11-2187/TH
  • ISSN: 0577-6686

Journal of Mechanical Engineering ›› 2019, Vol. 55 ›› Issue (22): 41-51.doi: 10.3901/JME.2019.22.041

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Research on Tire Stiffness and Rolling Resistance Matching of In-wheel-motor Direct Drive Electric Vehicle

ZHU Chengwei, CHEN Qiang, ZHUANG Ye, GAO Xueliang, GAO Bingzhao, TIAN Mengjian   

  1. State Key Lab of Automotive Simulation and Control, Jilin University 130000
  • Received:2019-07-25 Revised:2019-11-07 Online:2019-11-20 Published:2020-02-29

Abstract: The matching of vertical stiffness and rolling resistance characteristics of IEV tire are studied in this paper. The negative effect of suspension characteristics caused by the increasing unsprung mass in the IEV is analysed, and tire inflation pressure is utilized to adjust tire vertical stiffness and further improve suspension characteristic. The experiments of tire vertical stiffness under the four groups inflation pressure are designed and implemented, and the real vertical stiffness of tire under different inflation pressure are applied to analysis the suspension characteristics. The results indicate that the second resonance frequency of suspension characteristics are changed by the tire vertical stiffness, which are far away from the sensitive frequency range of human body and the vibration amplitude reduced within a certain frequency range. In order to achieve the optimal matching of the stiffness and rolling resistance characteristics of IEV tire, the effects of inflation pressure on the tire rolling resistance characteristics and energy consumption are investigated, in which the experiments of the tire rolling resistance and hysteresis characteristics under corresponding inflation pressure are implemented respectively. The test results show that the tire inflation pressure has a great influence on the tire rolling resistance, the higher the tire inflation pressure, the smaller the tire rolling resistance coefficient and energy consumption. The results further show that the relationship between the tire inflation pressure and rolling resistance coefficient have an excellent consistent with the relationship between the tire inflation pressure and energy consumption. Therefore, The negative effects of the increasing unprung mass of IEV is improved through the tire vertical stiffness, in which the effects of the tire inflation pressure on rolling resistance and energy consumption should be considered, and this paper provides a theoretical foundation for the interaction mechanism between tire and suspension of IEV tires.

Key words: in-wheel motor electric vehicle, inflation pressure, suspension characteristics, vertical stiffness, rolling resistance, energy consumption

CLC Number: