AMT车辆液压系统的仿真与应用

AMT（Automated dMechanical Transmission,即电控机械式自动变速器）的执行机构广泛采用液压系统,包括蓄能器、电磁阀、管路、选换挡液压缸和离合器操纵液压缸。为了缩短换挡时间,提高换挡品质,对液压系统的流量有一定的要求,尤其是载质量大的车辆,对流量有更高的要求,为了提高液压系统的流量,同时照顾系统的小型轻量化,运用功率键合图方法,首次对AMT液压系统建立了完善的高阶时变非线性状态方程,通过仿真实验,得到了许多有意义的结论,实车应用后,明显提高了换挡速度,从而大大缩短了液压系统的开发周期。

Simulation of AMT's Hydraulic System and its Application

Hydraulic system is widely used as actuator of AMT (Automated Mechanical Transmission),which consists of a hydraulic accumulator,electromagnetic valves,pipeline,hydraulic cylinders for gear shifting and clutch manipulating.In order to reduce gearshift time and improve its quality, a certain flow rate in hydraulic system is required, especially for heavy duty vehicle. To increase the flow rate of hydraulic system while keeping the size and weight of the system at minimum possible,a high order time dependent nonlinear state equation was built up for AMT's hydraulic system using bond graph techniques for the first time.Many valuable conclusions were drawn through simulation.In practical application, the swiftness of gear shifiting was enhanced significantly, and the development lead-time of hydraulic system is also greatly reduced.