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A Parameter Estimation Method of Smith Predictor Based on Fuzzy Algorithm

A fuzzy algorithm and parameter estimation technology, applied in the field of time-delay systems, can solve the problem of unsolved precise parameter matching, and achieve the effects of improving control quality and accuracy, improving parameter matching, and improving stability

Inactive Publication Date: 2017-07-11
JIANGSU HUAHAO MARINE ELECTRICAL APPLIANCE
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Problems solved by technology

So far, the problem of exact parameter matching between the Smith estimator and the plant has not been solved.

Method used

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  • A Parameter Estimation Method of Smith Predictor Based on Fuzzy Algorithm
  • A Parameter Estimation Method of Smith Predictor Based on Fuzzy Algorithm
  • A Parameter Estimation Method of Smith Predictor Based on Fuzzy Algorithm

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Embodiment Construction

[0070] Attached below Figure 1-7 , the specific embodiment of the present invention is described in detail:

[0071] S1, set up a temperature control system based on PID control, and keep the temperature inside the incubator at the indoor temperature for a period of time, and use the temperature rise process of the incubator based on PID control to complete the parameter identification of the Smith predictor and the controlled object (incubator) match.

[0072] S2, start the temperature control system based on PID control to heat the incubator, and raise the temperature inside the incubator to the target temperature. Repeat the above experiment several times while recording the temperature inside the incubator. According to the experimental results, calculate the proportional parameter K of the controlled object (incubator) p (t). Scale parameter K p The calculation expression of (t) is:

[0073]

[0074] In the formula, T i (t) is the real-time output of the time-d...

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Abstract

The invention discloses a Smith estimator parameter estimating method based on fuzzy algorithm. The Smith estimator parameter estimating method can be used for estimating Smith estimator parameters in real time and assists a Smith estimator in accurately and quickly improving PID control performance of a time delay system. Proportionality coefficient Kp (t) and delay coefficient t (t) of the Smith estimator is estimated in real time by means of output and input of the delay system, and inertia element coefficient T (t) is estimated in real time by means of fuzzy algorithm. The Smith estimator parameter estimating method has the advantages that Kp (t) and t (t) of the Smith estimator can be estimated effectively in real time, and real-time estimation accuracy is greatly improved. A fuzzy algorithm model of the inertia element coefficient T (t) is constructed, accuracy and adaptability of real-time estimation of T (t) are improved, and interference to the real-time estimation of the inertia element coefficient T (t) from external interference signals is eliminated. By the Smith estimator parameter estimating method, control quality and accuracy of the delay system based on PID control are improved, and instantaneity and stability of PID control are ensured.

Description

technical field [0001] The invention relates to a parameter estimation method of a Smith predictor based on a fuzzy algorithm, especially for a time-delay system based on PID control. Background technique [0002] As a physical quantity that characterizes the degree of hot or cold of an object, temperature plays a vital role in various fields of national production. Since temperature is a typical time-delay process with a large inertia link, the temperature control system is the most common and widely used time-delay system in the industrial field, such as metallurgy and petroleum fractionation. [0003] Temperature control refers to making the controlled object transition from a certain initial temperature to the target temperature smoothly and accurately under the action of the control law, and keeping the temperature of the controlled object relatively stable. Among many temperature control methods, PID control method is the most widely used temperature control method wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B13/04
Inventor 赵琳齐兵王通达王兴元刘峰倪方忠
Owner JIANGSU HUAHAO MARINE ELECTRICAL APPLIANCE
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