液力自动变速器传动系统建模与换挡特性仿真

根据液力自动变速器换挡过程中操纵件的动态特性,建立换挡过程的动力学模型.建立以转速、节气门开度和驱动模式为参数的发动机模型.依据整车参数,设计换挡规律,提出换挡过程中操纵件的油压控制方法.基于MathCAD数学软件,建立包含驾驶员、机械系统和控制系统等完整的动力传动系统虚拟样机.仿真结果表明,建立的仿真原型与平台可预测传动系统在多种工况下相应动态特性,为换挡规律与换挡品质的仿真提供一个合理的解决方案.

Drive line modeling and shift characteristic simulation of automatic transmission powertrain system

Based on the dynamic characteristic of the shifting elements of automatic transmission while shifting,a kinetic mathematic model of the shifting process was set up.Engine model was set up with engine speed,throttle and drive mode as parameters.The shifting strategy was designed with the vehicle data,and an oil pressure control method for shifting elements during shifting process was suggested.Based on the software platform MathCAD,a complete virtual prototype for the powertrain system was built including driver,mechanical system and control system etc.Simulation results show that the built simulation prototype and platform can predict the dynamic characteristic of the powertrain system under different driving cases,and so provides a proper solution for the simulation of shifting strategy and quality.