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Multi-target intelligent control method for electronic expansion valve of refrigeration air conditioner heat pump system

An electronic expansion valve, intelligent control technology, used in control/regulation systems, general control systems, refrigerators, etc., can solve problems such as impossible to achieve optimal results, and achieve extensive adaptability, stable work, and system performance. improved effect

Inactive Publication Date: 2009-08-05
TIANJIN UNIV
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AI Technical Summary

Problems solved by technology

The control object of the currently applied control method is mostly single with the superheat or subcooling as the target control, which is in contradiction with the multi-variable characteristics of the system itself, and it is impossible to achieve the optimal effect

Method used

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  • Multi-target intelligent control method for electronic expansion valve of refrigeration air conditioner heat pump system
  • Multi-target intelligent control method for electronic expansion valve of refrigeration air conditioner heat pump system
  • Multi-target intelligent control method for electronic expansion valve of refrigeration air conditioner heat pump system

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Embodiment Construction

[0024] Firstly, the control principle adopted by the present invention will be described below.

[0025] Refrigeration air conditioning heat pump system is a multi-variable, strongly coupled multi-parameter coordinated system. The opening degree of the electronic expansion valve affects many parameters. The difference between the systems determines that the classical control method does not have wide adaptability in this system. Generally speaking, the control of the electronic expansion valve is controlled by a parameter as the control target. Such control methods are far from reality. The single neuron fuzzy control system that the present invention proposes can effectively solve such problems, see figure 2 . The single-neuron fuzzy multi-variable controller collects each variable separately, and then compares it with the set value of each variable, generates the deviation and the deviation change rate, performs fuzzy processing, and then generates the control amount of...

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Abstract

The invention relates to a multipurpose intelligent control method for an electronic expansion valve of a heat pump system of a refrigeration air-condition, belonging to the technical field of the independent heat and cold energy supply of buildings. The method comprises the steps of(1) determining two or more controlled parameters affected by the electronic expansion valve,(2) determining a set value for each controlled parameter and carrying out detection in real time, (3)comparing the detection value and the set value of each controlled parameter, calculating deviation and deviation change rate, then carrying out indistinct processing to generate the control quantity of respective electronic expansion valve,(4) obtaining the control quantity of each electronic expansion valve by being calculated by the step (3) to be taken as the input layer of a neural network controller and obtaining the right value of each controlled parameter by being trained by a single neuron neural network and (5) obtaining the feedback control quantity of the electronic expansion valve according to each controlled parameter value detected in real time. Due to the adoption of the method, operating parameters can be intelligently adjusted, so that intelligent heat and cold supply and stable and efficient operation under a variety of climatic conditions are realized.

Description

technical field [0001] The invention belongs to the technical field of building independent cooling and heating energy supply, and relates to a control method for an electronic expansion valve of a refrigeration air-conditioning heat pump system. Background technique [0002] The control characteristics of refrigeration and air-conditioning heat pump systems include multi-variable, nonlinear, strong coupling, large delay, pure lag, time-varying, etc., and its application areas and operating environments are complex. The opening of the electronic expansion valve affects many parameters, such as superheat, subcooling and compressor pressure ratio. Generally speaking, the control of the electronic expansion valve is controlled by a parameter as the control target. Such control methods are far from reality. At present, simple PID control, fuzzy control or a simple combination of the two methods are mostly used in the electronic expansion valve control of such systems, but sati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B49/02G05B13/02
Inventor 杨昭徐振军
Owner TIANJIN UNIV
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