摘要
推荐采用 CVT换档速度控制的一种算法来改进金属推块无级变速器车辆的燃油经济性。重新调整CVT换档动力学方程式 ,可以找到 CVT换档速度与工作油压以及初始油压有关 ,绘制换档速度图估算工作油压对换档速度的影响 ,以求出换档速度为目标 ,提出工作油压计算的一种算法。为了估算换档速度和液体的损耗 ,采用考虑 CVT换档动力学的试验证实求得工作油压控制阀和比例控制阀的动力学模型。根据仿真的结果 ,尽管由于工作压力增加液体损失增加 ,发觉燃油经济改进为 2 %。
An algorithm to improve the fuel economy of a metal belt continuously variable transmission (CVT) vehicle by CVT shift speed control is suggested in the paper. By rearranging the CVT shift dynamic equation, it is found that the CVT shift speed depends on the line pressure as well as on the primary pressure. CVT shift speed maps are constructed to evaluate the influence of the line pressure on the shift speed. To obtain a target shift speed, an algorithm to calculate the line pressure is presented. In order to estimate the shift speed and the hydraulic loss, dynamic models of the line pressure control valve and the ratio control valve are obtained by considering the CVT shift dynamics and validated by experiments. It is found from the simulation results that fuel economy can be improved by 2 per cent in spite of the increased hydraulic loss due to the increased line pressure.
出处
《传动技术》
2004年第2期37-45,共9页
Drive System Technique
