基于改进的最小二乘法伺服液压PID控制系统设计

Design of servo hydraulic PID control system based on least square method

为了有效解决液压传动系统应用中存在的元件控制复杂度高和容积流量动态性导致的系统工作效率低下问题,在建立基于最小二乘法的液压控制模型基础上,设计了具有高效稳定的伺服液压PID控制系统。首先,针对大功率负载下的阀门控制损耗和容积不稳定性,结合最小二乘法拟合的传感器控制向量,提出基于最小二乘法的液压控制模型;接着,通过横切柱面推动模块结合混动曲轴以及液压传感器设计电动机伺服液压PID控制系统的传动组,并建立了伺服液压PID控制系统;最后,通过现场测试和实验分析所得结果,证明了所设计的伺服液压PID控制系统在减小阀门位移、输出液压力抖动和传感器故障次数以及提高液压泵容积效率等方面均具有良好的表现。

In order to effectively solve the problems of high system control complexity and volumetric flow rate dynamics caused by the application of hydraulic transmission system, design a highly efficient and stable servo hydraulic PID control system based the least squares hydraulic control model. Firstly, aiming at the valve control loss and volume instability under high power load, combined with the least squares fitting of the sensor control vector, a hydraulic control model based on the least squares method is proposed;then, throught the cross-cylinder is used to push the module in combination with the mixing crankshaft and the hydraulic pressure sensor, design the servo group hydraulic pressure PID control system transmission group,and established the servo hydraulic pressure PID control system. Finally, throught the field test and experimental analysis show that the designed servo-hydraulic PID control system has good performance in reducing the valve displacement, the output hydraulic pressure jitter, the number of sensor failures, and improving the volumetric efficiency of the hydraulic pump.