重型载货汽车AMT离合器气动执行机构的建模与控制

建立了某重型载货汽车的离合器气动执行机构数学模型,并分别设置了分离和接合过程中的离合器缸活塞目标位置。仿真结果表明,当目标位置设置较小时,单独控制相应电磁阀,活塞基本可以停在预定位置;当目标位置设置较大时,单独控制相应电磁阀,系统超调量较大,增加了离合器控制的难度。利用离合器执行机构台架进行了静态试验,所得试验结果与仿真结果基本吻合,验证了仿真模型的有效性。设计的分段动态控制器控制离合器的仿真结果表明,能够使分离轴承实际位移很好地跟随理想位移变化。

Modeling and Simulation of AMT Clutch Actuating Mechanism of Heavy Duty Truck

Mathematic model of a heavy-duty truck clutch pneumatic actuator is built,and clutch cylinder piston target locations in disengagement and engagement are set separately.Simulation results indicate that if a small target position is set,control separately corresponding solenoid valve,the piston can stop at the preset position;whereas if a big target position is set,control separately corresponding solenoid valve,the system overshoot is high,increasing difficulty of clutch control.Static test is made with clutch actuator bench,and the results are basically identical with simulation result,verifying validity of the simulation model.The simulation of the section dynamic controller controlling clutch indicates that the actual displacement of release bearing can fairly follow variation of ideal displacement.