Intelligent linear temperature rise control method

Abstract

The invention provides an intelligent linear temperature rise control device which comprises a platinum resistor temperature sensor (1); the platinum resistor temperature sensor (1) converts temperature into a resistance value and outputs the value; high temperature-resistant leads (2) are connected to the four meter head measuring ports of a digital multimeter (3) through a four-wire resistance measuring mode; the digital multimeter (3) and a digital power supply (6) are connected with a computer (5) through a general purpose interface bus (GPIB) (4); the computer (5) remotely controls real-time acquisition, data saving and temperature rise processes; linear temperature rise control comprises a variable parameter PID and the program control of a high-precision temperature rise rate measuring method within cycle time; control voltage which is worked out according to the linear temperature rise control is added on a resistance heating piece (7) of a controlled object, so that the linear temperature rise to the controlled object is realized. The linear temperature rise control device has the advantages of high control precision, high stability and simple structure of the device.

Description

technical field [0001] The invention relates to the technical field of automatic temperature measurement and control, in particular to an intelligent linear temperature rise measurement and control device, which is a high-precision intelligent linear temperature rise measurement and control device suitable for use in physical and chemical experiments. Background technique [0002] The linear heating temperature control system is widely used in physical, chemical, biological and other scientific experiment environments, which requires a high-precision heating rate. Considering that the linear heating device has hysteresis, time-varying and nonlinearity, it is difficult to establish an accurate mathematical model of the system, and it is difficult to achieve high-precision linear heating control. Therefore, if the conventional linear control theory is used, to achieve a satisfactory control effect is It is very difficult; on the other hand, the conventional PID has the advanta...

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Problems solved by technology

Considering that the linear heating device has hysteresis, time-varying and nonlinearity, it is difficult to establish an accurate mathematical model of the system, and it is difficult to achieve high-precision linear heating control. Therefore, if the conventional linear control theory is used, to achieve a satisfactory control effect is It is very difficult; on the other hand, the conventional PID has the advantages of being simple and practical, so it has been widely used in this field, but its disadvantage is that the PID parameter setting needs to be completed by experienced engineers and takes a long time. When strong interference or system structure changes, it is easy to cause the feedback value of the controlled variable to be too large, so that too much control quantity is input, which in turn leads to system overshoot, large oscillation, etc., and even divergence, resulting in large overshoot of the traditional control method. , long adjustment time, and low control accuracy; in addition, for the uniform heating control system, the key to improving the accuracy of the temperature control system is to improve the sampling accuracy of the heating rate. The accuracy of the heating system is ensured by obtaining two temperature value sampling points within the temperature range. The accuracy of the heating rate obtained by only relying on two points is limited and the external interference is large.

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