重型商用车AMT自动控制策略及试验分析

Automatic control strategy and its test analysis for the heavy truck AMT

通过对重型商用车电控机械式自动变速器(automated mechanical transmission,AMT)起步过程分析,在综合考虑驾驶员起步意图和起步性能指标的基础上,提出起步过程离合器结合速度模糊控制算法和发动机局部恒转速模糊控制算法,将AMT换挡过程分为7个阶段,提出换挡过程离合器控制逻辑和发动机目标转速控制算法。针对车辆运行过程中出现的紧急制动工况,提出AMT制动跳挡降挡控制策略和目标挡位确定算法。为了验证控制策略的正确性,研制开发了重型商用车AMT样机,完成了AMT样车开发并进行起步、换挡和制动跳挡降挡试验。

By analyzing the startup process of automated mechanical transmission（AMT）, fuzzy control algorithm of clutch engagement speed and constant engine speed in part during startup are proposed based on comprehensive consideration of driver＇s startup intention and startup performance indices. Through dividing shift process of AMT into seven stages, clutch control logic and goal speed control algorithm of engine during the shift process are put forward. Aiming at the emergency braking condition, a control strategy of jump downshift during braking and a determination method of target gear are also proposed. In order to verify the validity of control strategy, an AMT prototype vehicle is developed and the test of startup, shift and jump downshift are carried out.