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Electric heating furnace temperature control method based on improved fuzzy Smith-PID

A kind of temperature control method, technology of electric heating furnace

Pending Publication Date: 2020-11-24
NANTONG UNIVERSITY
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Problems solved by technology

However, in some electric heating furnace control systems with high control performance requirements, conventional PID control can no longer satisfy all industrial processes.
Especially in process objects with large time delay, strong coupling, nonlinear and other characteristics, conventional PID control often cannot achieve ideal control effects, limited by the difficulty of parameter tuning, the adaptability of conventional PID controllers is very poor

Method used

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  • Electric heating furnace temperature control method based on improved fuzzy Smith-PID
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  • Electric heating furnace temperature control method based on improved fuzzy Smith-PID

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Embodiment Construction

[0032] The present invention will be further explained below in conjunction with the accompanying drawings.

[0033] An improved fuzzy Smith-PID based electric heating furnace temperature control method is based on the system such as figure 1 As shown, it includes temperature deviation change rate quantization factor 1, temperature deviation quantization factor 2, fuzzy controller 3, PID controller 4, electric heating furnace 5, improved Smith predictor 6, nine-point controller 7, temperature sensor 8 .

[0034] Such as figure 2 As shown, the method includes the following steps:

[0035] Step 1: Determine the input quantity of the fuzzy controller:

[0036] The actual temperature of the electric heating furnace is collected by the temperature sensor, and the actual temperature value is compared with the given value to obtain the temperature deviation e and the change rate ec of the deviation, which are used as the input of the fuzzy controller.

[0037] Step 2: Design the...

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Abstract

The invention discloses an electric heating furnace temperature control method based on improved fuzzy Smith-PID. The method comprises the steps that firstly, the actual temperature of the electric heating furnace is collected through a temperature sensor and compared with a given value to obtain a temperature deviation value and the change rate of the deviation value; performing fuzzy reasoning to obtain three control parameter setting quantities so as to calculate a control signal of the electric heating furnace through a PID controller; an improved Smith predictor is added in the system forpredictive compensation, and a nine-point control method is used for adjusting a filtering time constant of a feedback channel of the Smith predictor. According to the method, the traditional PID isreplaced by the parameter self-tuning fuzzy PID, so that the overshoot of the system is reduced, and the robustness of the system is improved. On the basis of a traditional Smith predictor, a nine-point control method is introduced into a time delay system, real-time online adjustment is carried out on a filtering time constant of a feedback channel, and the influence caused by mismatching of a prediction model is relieved while a lag link is compensated.

Description

technical field [0001] The invention relates to a method for controlling the temperature of an electric heating furnace based on an improved fuzzy Smith-PID, belonging to the field of temperature control of the electric heating furnace. Background technique [0002] As a clean, safe and efficient production equipment, electric heating furnaces are widely used in industrial fields and all aspects of people's lives. However, as the controlled object, the electric heating furnace has the characteristics of large hysteresis, which shows that it is easy to produce a large overshoot in the process of temperature rise. Large overshoot is not allowed in temperature control. Therefore, improving the control performance of electric heating furnace objects and ensuring the stability of the control system is not only a guarantee for the production process requirements, but also a prerequisite for ensuring the safe production of equipment. [0003] For the electric heating furnace temp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B11/42G05B13/04F27D19/00
CPCG05B11/42G05B13/0275G05B13/042F27D19/00
Inventor 吴晓新赵双双朱志豪於锋
Owner NANTONG UNIVERSITY
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