离合器参数对HMCVT换段品质的影响规律研究

Study on Influence Rules of Clutch Parameters on HMCVT Shift Performance

为了提高HMCVT的换段品质,通过仿真与试验相接合的方法对离合器充油流量和压强与换段品质之间的关系进行了研究。分析了滑摩阶段离合器从动端转速和离合器传递转矩的变化规律,同时使用SimulationX建立了变速器模型,并在一定条件下对该模型进行了试验验证。基于模型研究了离合器充油流量与压强对换段品质的影响,阐述了其影响规律。建立了换段品质总评价函数,基于AHP确定了函数中各评价指标权重值,并得出了换段品质最优时的充油流量与压强组合。在试验条件范围内:增大离合器的充油流量可以减小速度降、最大滑摩功率、滑摩功;增大充油流量对动载荷系数没有影响,增大充油压强会使动载荷系数增大。在充油流量和压强组合为6 L/min,5 MPa时,可以获得最佳的换段品质。

In order to improve the shift performance of the Hydraulic Mechanical Continuously Variable Transmission(HMCVT), the relationship between clutch oil filling flow, pressure and shift performance was studied by the simulation and experiment in this paper. The variation law of clutch driven-end speed and clutch transmission torque in sliding phase was analyzed. At the same time, the transmission model was established with SimulationX, and the model was tested and verified under specific conditions. The influence of clutch oil filling flow rate and oil filling pressure on the quality of shift performance was simulated and analyzed with the model. Objective function of the shift performance was established, and the weight value of each evaluation index in the function was determined by the AHP. According to simulation test results: increasing the oil filling flow and pressure of the clutch can reduce the speed changing, maximum sliding friction power and sliding friction work, and improve the quality of shift performance. However, increasing the clutch oil filling flow has no effect on the dynamic load factor, and increasing the oil filling pressure will increase the dynamic load factor. The best shift performance can be obtained when the clutch oil filling flow and pressure combination is 6 L/min and 5 MPa, respectively.