为保障电动物流车驱动电机工作在安全温度区间内,需精确控制其冷却系统的输出功率,而常用的阈值触发控制方式未考虑驱动电机热损耗与冷却系统输出功率间的对立关系,导致冷却系统消耗总功率较高.文中通过分析总功率消耗与电机温度间的关系,提出了一种最优温度控制策略,将总功率消耗最低点对应的电机温度作为控制目标,并以此为依据实时调节电子风扇转速,降低冷却系统输出功率,使冷却系统的总功率消耗达到最低.以某型电动物流车驱动电机冷却系统为例,通过AMESim-Matlab联合仿真平台对该控制策略进行了仿真,验证了该控制策略的可行性;通过搭建实物试验平台对该控制策略进行了测试,试验结果表明应用该最优控制策略后,冷却系统的总功率消耗较阈值触发控制方式降低约3.8％.

In order to test the reliability of cylinder,a cylinder reliability test bench was designed by adopting the pneumatic transmission and control technology,and SQL database technology based on LabVIEW virtual instrument platform.The test bench can achieve the aim of periodic performance test and automatic continuous life test.Its hardware includes pneumatic circuit components,pressure sensors,displacement sensors,and NI data acquisition card.Software of the test bench was programmed through modularized design pattern,and it can implement functions as landing management,solenoid valve drive,cylinder invalid self-diagnosis,displacement acquisition and processing.The virtual instrument interface can display displacement-time curve,cylinder action times real-timely,store test data in SQL server automatically,and provide cylinder reliability test results via data report.