多态模块化自动变速器换挡过程仿真与试验

Simulation and test on shift process of multi-state modular automatic transmission

摘要:

为实现一种新式模块化变速器试验样机的自动换挡功能，设计了样机配套换挡液压系统，并对换挡过程进行仿真建模.基于刚体动力学原理对二挡模块样机进行分析，并利用MATLAB/Simulink建立包括传动系和液压缸的整体仿真模型.利用溢流调压控制，设计一套简化换挡液压系统.以输出轴扭矩变化率和输入轴最低转速作为评价指标，研究充油流量、复位弹簧预紧量等参数对该新型结构样机换挡品质的影响规律.用换挡试验验证了模型和样机换挡可信度.结果表明，充油流量决定零件运动速度和液压缸内压力上升速度，影响换挡速度和换挡制动时间.增大流量可有效消除换挡制动，但会引起冲击增加；使用较小的弹簧预紧量可以减小换挡冲击.

Abstract:

To achieve automatic shift function of a new type of modular transmission, a hydraulic shift system was designed for the prototype and the simulation model of shift process was built. A prototype with two speed was analyzed based on the principle of rigid body dynamics, a model including the driveline and hydraulic cylinder was established in MATLAB/Simulink. A simplified hydraulic shift system was designed with overflow pressure regulation. By using output torque change rate and input minimum speed as the evaluation index, the influence of parameters including filling flow and spring preload on the prototype's shift quality was studied. The test achieved the shift of prototype and verified the reliability of model. According to the simulation, the filling flow determined the velocity of part and the rising speed of inner pressure of cylinder, which affected the shift speed and braking. Increasing filling flow could effectively eliminate braking, but cause increase of shift impact; decreasing the preload of spring could reduce the shift impact.