比例电磁阀开环-闭环复合控制算法

以比例电磁阀为研究对象,以快速建立具有良好性能的通用控制算法为目标,以充分利用电磁阀的响应特性为途径,提出了将开环控制和闭环控制相结合的开环-闭环复合控制算法,论述了控制算法的模型结构和设计过程。不同于将误差作为唯一输入的常规控制算法,复合控制算法同时将目标值和误差作为控制器的输入。以电磁阀响应特性实验为基础,根据电磁阀的稳态特性建立开环控制表,消除系统的稳态非线性;根据电磁阀的瞬态特性设计了闭环控制器和滞后特性预估修正模块,降低了模型误差和滞后特性的影响,提高了动态响应性能。实验结果验证了复合控制算法的控制精度、响应速度和鲁棒性。

Open Loop-Closed Loop Compound Control Algorithm of Proportional Solenoid Valve

In order to quickly establish a pressure control algorithm with good performance for proportional solenoid valve, a compound control algorithm with the combination of open loop control and closed loop control was presented. The algorithm improved the control performance by making full use of the valve response characteristics. Control algorithm design process and control models were established. Unlike the conventional control methods which took the error as the only input, the input of compound control algorithm consisted of both the goal value and the error value. Valve respond characteristics were tested. The open loop control table was established based on the steady-state characteristics of the valve and the saturation in steady-state was eliminated by the open loop control table. The closed loop control value and delay effect compensate value were calculated according to the transient characteristics and the closed loop controller was used to revise the model error and improve the dynamic response. Experiment results showed that the performance of compound control algorithm was accurate, fast response and robust.