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Method for controlling electronic expansion valve based on non-synchronous PD

An electronic expansion valve, control electronics technology, applied in heating and ventilation control systems, mechanical equipment, heating and ventilation safety systems, etc., can solve problems such as system oscillation, and achieve the effect of stable control

Inactive Publication Date: 2020-04-17
四川长虹空调有限公司
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AI Technical Summary

Problems solved by technology

Due to the large hysteresis of the air-conditioning system itself, a larger control period in PD control can meet the needs of system parameters to reflect the control results, but the change value of a larger control period cannot fully represent the parameter change trend of the existing system, thus Oscillation of the system may be caused in the control

Method used

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Embodiment Construction

[0024] The invention aims to propose a method for controlling an electronic expansion valve based on asynchronous PD, so as to improve the stability and precision of electronic expansion valve control in an air conditioning system. The present invention uses PD control to adjust the opening of the electronic expansion valve based on the degree of superheat. In the control process, a longer control period is used to solve the influence of the large hysteresis of the air conditioning system on the control of the electronic expansion valve, and a smaller period D value is used to calculate and track the change value of the degree of superheat. Thereby reflecting the changing trend of system parameters and realizing high stability and high precision control of the expansion valve.

[0025] In terms of specific implementation, the solution of the present invention includes the following parts:

[0026] (1) PD control of superheat degree of electronic expansion valve:

[0027] Coll...

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Abstract

The invention relates to an electronic expansion valve control technology in the field of air conditioners, discloses a method for controlling an electronic expansion valve based on non-synchronous PD, and aims to improve stability and precision of electronic expansion valve control in an air conditioning system. According to the method, the opening degree of the electronic expansion valve is adjusted by adopting PD control according to superheat degree, wherein the opening degree Si is equal to S<i-1>+deltaS, Si is the step number of the electronic expansion valve at moment i, S<i-1> is the step number of the electronic expansion valve at moment i-1, deltaS is the step number change value of the electronic expansion valve at moment i, deltaS is euqal to mA+nB, A is the difference value between the actual superheat degree and the target superheat degree at moment i , and B is the change value of the actual superheat degree from moment i-1 to moment i; and in the process of controllingthe opening degree of the electronic expansion valve, a control period T of the electronic expansion valve is taken as a calculation period of an A value, and a period K smaller than the control period T is taken as a calculation period of a B value.

Description

technical field [0001] The invention relates to an electronic expansion valve control technology in the field of air conditioning, in particular to a method for controlling an electronic expansion valve based on asynchronous PD (proportional differential). Background technique [0002] The throttling device is an essential structural part of the air conditioning system to realize the refrigeration and heating cycle. With the improvement of energy efficiency requirements, the existing air conditioning and refrigeration systems mostly use electronic expansion valves for throttling control. The stability and accuracy of electronic expansion valve control are directly related to the system's capacity and energy efficiency. Due to the large hysteresis of the air-conditioning system itself, a larger control period in PD control can meet the needs of system parameters to reflect the control results, but the change value of a larger control period cannot fully represent the paramete...

Claims

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Application Information

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IPC IPC(8): F24F11/61F24F11/84F24F140/20
CPCF24F11/61F24F11/84F24F2140/20
Inventor 徐强刘静赵寰文青李诗荃
Owner 四川长虹空调有限公司
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