Control loop actuator hysteresis predictive compensation method

Abstract

The invention relates to actuator hysteresis compensation in the industrial control field, in particular, a control loop actuator hysteresis predictive compensation method. With the method adopted, adjustable parameters are few, and the physical meaning of parameters is clear. The method includes the following steps that: a predictive compensator is set, after the predictive compensator receives control signals u<^>(t) outputted by a controller, the compensation strength of a hysteresis compensator is adjusted through utilizing a predictive gain coefficient K, high-frequency change of compensation signals which is caused by noises can be alleviated through utilizing a noise filter coefficient Tf, and therefore, predictive signals x<^>(t) can be generated; a limiting value Ld is set for the predictive signals, and the predictive signals are prohibited from exceeding a limit, and amplitude-limited predictive compensation signals x (t) can be obtained; the sum of the predictive compensation signals x (t) and the control signals outputted by the controller, adopted as actual control signals u (t), is transmitted to an actuator. With the method adopted, hysteresis compensation can be realized for general industrial control systems easily, and adjustable parameters are few, and the physical meaning of parameters is simple and intuitive and is easy to be grasped by a user, on-line tuning and / or self-tuning of the parameters of the compensators can be realized easily.

Description

technical field [0001] The invention relates to the design of industrial controllers, in particular to the improvement of the hysteresis response compensation method of actuators in industrial controllers. Background technique [0002] The purpose of industrial controller design is to make the controlled device operate according to the required indicators, or to make the controlled device have the desired response. A typical process industry process generally has hundreds of control loops. Improving the performance of process control loops is conducive to improving product quality, reducing product failure rate, reducing production costs, and improving energy efficiency and production efficiency. Honeywell has analyzed the performance of 26,000 PID control loops in continuous industrial processes for two years, and the results show that only 1 / 3 of the control loop systems have good performance, and the system performance of other control loops needs to be improved. The osc...

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Problems solved by technology

[0041] In order to overcome the shortcomings of the existing controllers in the adjustment operation for actuator hysteresis compensation, there are many parameters, the meaning of the parameters is not clear, and it is not easy to popularize and utilize. The technical problem to be solved by the present invention is to provide a kind of A predictive compensation method for actuator hysteresis in control loops with clear physical meaning, so as to be applicable to more controller systems

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