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《Transactions of The Chinese Society of Agricultural Machinery》 2002-02
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The Influence of Vehicular Mass Parameters on the Optimum Shift Point

Zhang Yong Song Jian(Tsinghua University) Xu Chunxin(Jilin University)  
The shift schedule is the key of an automatic transmission system, the optimum shift point determines the time of gear change to gain the vehicle best performance. The dynamic tri parameter shift point theory provides a good way of shift point determining in the previous research. According to the theory, the optimum shift point was calculated under various conditions of vehicle moving mass and a light truck was adopted as research plant in this paper. The model of the vehicle and the engine was described, and then the shift points were gained by calculating the point of intersection of vehicle acceleration curves. The results show that the shift points are difference under different vehicle moving mass. The influence of vehicular mass parameter on the optimum shift point was worked out. The paper explained why this diversity is caused through dynamic analysis of vehicle driving. It was pointed out that the shift schedule should have an ability to adapt the driving conditions. An idea of using vehicle mass as shift control parameter was suggested. The research in this paper provided a theoretical basis for the self adaptive shift schedule and adopting the mass as shift control parameter.
【Fund】: 国家自然科学基金资助项目 (项目编号 :5 0 0 75 0 3 3 )
【CateGory Index】: U463.2
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