基于自适应模糊PID控制下拖拉机液压系统的优化

Optimization of Tractor Hydraulic System Based on Adaptive Fuzzy PID Control

为了实现拖拉机电子液压系统在田间的压力控制,建立了拖拉机液压控制系统数学模型,并结合压力控制算法设计了拖拉机自适应模糊PID控制系统,以实现拖拉机的压力控制。以传统PID算法、带补偿修正的传统PID算法和补偿修正的自适应模糊PID算法进行试验,验证不同控制器对拖拉机的压力控制效果。研究结果表明:当输入为1.5MPa的阶跃信号,传统PID控制器的响应时间为2.5s,波动范围为0.5MPa;带补偿校正的自适应模糊PID的响应时间为1.5s,波动范围为0.3MPa,响应时间降低了40%,压力波动范围也减少了40%。因此,提出的补偿修正的自适应模糊PID算法下拖拉机液压系统具有更好的动态控制性能。

In order to realize the pressure control of the tractor's electronic hydraulic system in the field,the mathematical model of the tractor's hydraulic control system was established in this study,and the tractor's adaptive fuzzy PID control system was designed in combination with the pressure control algorithm to realize the tractor's pressure control.Field experiments were carried out with traditional PID algorithm,traditional PID algorithm with compensation correction and adaptive fuzzy PID algorithm with compensation correction to verify the pressure control effect of different controllers on the tractor.The research results show that when the input is a step signal of 1.5MPa,the response time of the traditional PID controller is 2.5s,the fluctuation range is 0.5MPa,the response time of the adaptive fuzzy PID with compensation correction is 1.5s,and the fluctuation range is 0.3MPa,the response time is reduced by 40%,the pressure fluctuation range is also reduced by 40%,the response time is reduced by 40%,and the pressure fluctuation range is reduced by 40%.Therefore,the compensation and correction adaptive fuzzy PID algorithm proposed in this study has better dynamic control performance of the tractor hydraulic system.