Control method and control system thereof using PID algorithm

Abstract

The invention relates to the technical field of PID control, in particular to a control method and a control system thereof using a PID algorithm. In the improved PID algorithm, besides four basic peripheral parameters, such as a sampling period, a proportionality factor, an integral coefficient and a differential coefficient, six peripheral parameters such as an initial difference, a dead zone difference, a dead zone integral value, a differential period, an integral weighting coefficient and an integral value upper limit are added, and a method for calculating the integral value is also changed, so that through the control method and the control system, intensity reaction can be more reasonably performed and ideal control accuracy can be obtained by more methods.

Description

Technical field: [0001] The invention relates to the technical field of PID control, in particular to a control method applying a PID algorithm and a control system thereof. Background technique: [0002] At present, the level of industrial automation has become an important symbol to measure the level of modernization in various industries. In engineering practice, the most widely used control theory is the PID (Proportion Integration Differentiation) algorithm. PID algorithm is widely used in temperature, speed, position and other control systems, such as common temperature control meters, the core of which is the PID calculation software solidified in the chip. Such as figure 1 As shown, the basic principle of the PID algorithm is to calculate the difference between the measured value and the target value, and integrate and differentiate the difference to obtain the integral value and differential value; Inertia feature, set the appropriate proportional coefficient, in...

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Problems solved by technology

Usually, the measured value can be controlled near the target value by applying the PID algorithm control theory well, but it still cannot make the most reasonable execution intensity response

[0003] In the enameled wire production industry, the PID algorithm is also used as the control theory of the temperature control system. With the improvement of control accuracy requirements, the PID algorithm using the original theory can no longer meet the requirements of enameled wire production.

In order to meet the ever-increasing control precision requirements, all control instruments and PLC manufacturers have improved the PID algorithm. The improved algorithms of each manufacturer are technical secrets, and the specific improvement content cannot be understood, but the peripheral parameters they provide to users All are the four basic parameters of sampling period, proportional coefficient, integral coefficient and differential coefficient, indicating that their improvement is limited to the fixed algorithm part, and the content and usage method of man-machine exchange have not been changed.

From the results of use, the Japanese RKC temperature control meter and the American Emerson PLC temperature control module can make the temperature control accuracy reach a certain level through the adjustment of the above four parameters, but there is still a lack of more means to make the control accuracy reach the ideal level. , which cannot meet the requirements of the large inertia temperature control system in the development of new enamelling machines

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