CN111322801A - Control method and device of electronic expansion valve - Google Patents

Control method and device of electronic expansion valve Download PDF

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Publication number
CN111322801A
CN111322801A CN202010124701.1A CN202010124701A CN111322801A CN 111322801 A CN111322801 A CN 111322801A CN 202010124701 A CN202010124701 A CN 202010124701A CN 111322801 A CN111322801 A CN 111322801A
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Prior art keywords
compressor
expansion valve
electronic expansion
refrigerant
discharge
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CN202010124701.1A
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CN111322801B (en
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李晓东
高德福
刘红斌
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Guangdong Kaili HVAC Co.,Ltd.
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Taiwan Semiconductor Manufacturing Co TSMC Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2513—Expansion valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/19—Pressures
    • F25B2700/193—Pressures of the compressor
    • F25B2700/1931—Discharge pressures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2115—Temperatures of a compressor or the drive means therefor
    • F25B2700/21152—Temperatures of a compressor or the drive means therefor at the discharge side of the compressor

Abstract

The present disclosure relates to air conditioners, and particularly to a method and an apparatus for controlling an electronic expansion valve. The exhaust temperature of the compressor is considered, the exhaust pressure of the compressor is also considered, the control of the electronic expansion valve is more accurate, and the problem that the electronic expansion valve is not accurately controlled due to the fact that the control of the electronic expansion valve is adjusted according to the exhaust temperature of the compressor is solved.

Description

Control method and device of electronic expansion valve
Technical Field
The present disclosure relates to air conditioners, and particularly to a method and an apparatus for controlling an electronic expansion valve.
Background
The variable-frequency multi-split air conditioner usually adopts the electronic expansion valve as a throttling part, and has the advantages of short reaction action time, wide applicable temperature range, flexible and adjustable superheat setting value, high adjustment precision, energy conservation and the like compared with a capillary tube and a thermal expansion valve. The flow of the system refrigerant is adjusted by adjusting the electronic expansion opening, so that the working condition of the system is matched, and the stability and the energy efficiency ratio of the system are improved. The control behavior and the control strategy of the electronic expansion valve therefore determine to a large extent the comfort and energy saving of the air conditioning system. At present, the control of the electronic expansion valve is adjusted according to the exhaust temperature of the compressor, so that the control of the electronic expansion valve is not accurate.
Disclosure of Invention
The application provides a control method and a control device for an electronic expansion valve, aiming at solving the problem that the control of the electronic expansion valve is adjusted according to the exhaust temperature of a compressor and the electronic expansion valve is not accurately controlled.
The technical scheme provided by the application is as follows:
a method of controlling an electronic expansion valve, the method comprising:
obtaining an inlet pressure P of a refrigerant at an inlet of an electronic expansion valve1An outlet pressure P of the refrigerant at an outlet of the electronic expansion valve2A flow area A of the electronic expansion valve, a liquid density ρ of the refrigerant, and a flow coefficient CDThe discharge temperature T of the compressor, the discharge pressure P of the compressor and the minimum value T in the discharge temperature range of the compressorminMaximum value T in the discharge temperature range of the compressormaxThe minimum value P in the range of the discharge pressure of the compressorminMaximum value P in the discharge pressure range of the compressormaxThe discharge temperature of the compressor influences factor C1And a discharge pressure influence factor C of said compressor2；
According to a first formula:
Figure BDA0002394059990000011
calculating the refrigerant flow m of the electronic expansion valve;
respectively comparing the discharge temperature T of the compressor with the minimum value T in the discharge temperature range of the compressorminMaximum value T in the discharge temperature range of the compressormaxComparing the discharge pressure P of the compressor with the minimum value P in the discharge pressure range of the compressorminMaximum value P in the discharge pressure range of the compressormaxComparing;
if Tmin＜T＜TmaxAnd P ismin＜P＜PmaxThen, according to a second formula:
Figure BDA0002394059990000021
calculating the target refrigerant flow m' of the electronic expansion valve;
comparing a target refrigerant flow m' of the electronic expansion valve with a refrigerant flow m of the electronic expansion valve;
if m' ≠ m, then according to a third equation:
Figure BDA0002394059990000022
calculating a target flow area A' of the electronic expansion valve;
and controlling the target opening degree of the electronic expansion valve according to the target flow area A' of the electronic expansion valve.
Further, obtaining the inlet pressure P of the refrigerant at the inlet of the electronic expansion valve1An outlet pressure P of the refrigerant at an outlet of the electronic expansion valve2A flow area A of the electronic expansion valve, a liquid density ρ of the refrigerant, and a flow coefficient CDThe discharge temperature T of the compressor, the discharge pressure P of the compressor and the minimum value T in the discharge temperature range of the compressorminMaximum value T in the discharge temperature range of the compressormaxThe minimum value P in the range of the discharge pressure of the compressorminMaximum value P in the discharge pressure range of the compressormaxThe discharge temperature of the compressor influences factor C1And a discharge pressure influence factor C of said compressor2Before the step (2), the method comprises the following steps:
acquiring the working time of the compressor;
judging whether the working time is greater than a preset time or not;
if yes, triggering to acquire the inlet pressure P of the refrigerant at the inlet of the electronic expansion valve1An outlet pressure P of the refrigerant at an outlet of the electronic expansion valve2A flow area A of the electronic expansion valve, a liquid density ρ of the refrigerant, and a flow coefficient CDThe discharge temperature T of the compressor, the discharge pressure P of the compressor and the minimum value T in the discharge temperature range of the compressorminMaximum value T in the discharge temperature range of the compressormaxThe minimum value P in the range of the discharge pressure of the compressorminDischarge pressure of the compressorMaximum value in the range PmaxThe discharge temperature of the compressor influences factor C1And a discharge pressure influence factor C of said compressor2The event of (2).
Further, a minimum value T in the range of the discharge temperature T of the compressor and the discharge temperature T of the compressor, respectivelyminMaximum value T in the discharge temperature range of the compressormaxComparing the discharge pressure P of the compressor with the minimum value P in the discharge pressure range of the compressorminMaximum value P in the discharge pressure range of the compressormaxAfter the step of comparing, comprising:
if T is less than TminAnd P < PminAnd keeping the current opening degree of the electronic expansion valve.
Further, a minimum value T in the range of the discharge temperature T of the compressor and the discharge temperature T of the compressor, respectivelyminMaximum value T in the discharge temperature range of the compressormaxComparing the discharge pressure P of the compressor with the minimum value P in the discharge pressure range of the compressorminMaximum value P in the discharge pressure range of the compressormaxAfter the step of comparing, comprising:
if T > TmaxOr P > PmaxAnd keeping the current opening degree of the electronic expansion valve.
Further, obtaining the inlet pressure P of the refrigerant at the inlet of the electronic expansion valve1An outlet pressure P of the refrigerant at an outlet of the electronic expansion valve2A flow area A of the electronic expansion valve, a liquid density ρ of the refrigerant, and a flow coefficient CDThe discharge temperature T of the compressor, the discharge pressure P of the compressor and the minimum value T in the discharge temperature range of the compressorminMaximum value T in the discharge temperature range of the compressormaxThe minimum value P in the range of the discharge pressure of the compressorminMaximum value P in the discharge pressure range of the compressormaxThe discharge temperature of the compressor influences factor C1And said pressureDischarge pressure influence factor C of compressor2In the step (2), comprising:
continuous real-time acquisition of refrigerant inlet pressure P at inlet of electronic expansion valve1An outlet pressure P of the refrigerant at an outlet of the electronic expansion valve2The flow area A of the electronic expansion valve, the exhaust temperature T of the compressor and the exhaust pressure P of the compressor;
obtaining the liquid density rho and the flow coefficient C of the refrigerantDMinimum value T in the discharge temperature range of the compressorminMaximum value T in the discharge temperature range of the compressormaxThe minimum value P in the range of the discharge pressure of the compressorminMaximum value P in the discharge pressure range of the compressormaxThe discharge temperature of the compressor influences factor C1And a discharge pressure influence factor C of said compressor2。
The present application further provides a control device for an electronic expansion valve, the device comprising:
a first obtaining module for obtaining an inlet pressure P of the refrigerant at an inlet of the electronic expansion valve1An outlet pressure P of the refrigerant at an outlet of the electronic expansion valve2A flow area A of the electronic expansion valve, a liquid density ρ of the refrigerant, and a flow coefficient CDThe discharge temperature T of the compressor, the discharge pressure P of the compressor and the minimum value T in the discharge temperature range of the compressorminMaximum value T in the discharge temperature range of the compressormaxThe minimum value P in the range of the discharge pressure of the compressorminMaximum value P in the discharge pressure range of the compressormaxThe discharge temperature of the compressor influences factor C1And a discharge pressure influence factor C of said compressor2；
A first calculation module to:
Figure BDA0002394059990000031
calculating the refrigerant flow m of the electronic expansion valve;
a first comparing module forRespectively comparing the discharge temperature T of the compressor with the minimum value T in the discharge temperature range of the compressorminMaximum value T in the discharge temperature range of the compressormaxComparing the discharge pressure P of the compressor with the minimum value P in the discharge pressure range of the compressorminMaximum value P in the discharge pressure range of the compressormaxComparing;
a second calculation module for calculating if Tmin＜T＜TmaxAnd P ismin＜P＜PmaxThen, according to a second formula:
Figure BDA0002394059990000041
calculating the target refrigerant flow m' of the electronic expansion valve;
the second comparison module is used for comparing the target refrigerant flow m' of the electronic expansion valve with the refrigerant flow m of the electronic expansion valve;
a third calculation module for, if m' ≠ m, according to a third formula:
Figure BDA0002394059990000042
calculating a target flow area A' of the electronic expansion valve;
and the control module is used for controlling the target opening degree of the electronic expansion valve according to the target flow area A' of the electronic expansion valve.
Further, the apparatus comprises:
the second acquisition module is used for acquiring the working time of the compressor;
the judging module is used for judging whether the working time is greater than the preset time or not;
a triggering module for triggering to acquire the inlet pressure P of the refrigerant at the inlet of the electronic expansion valve if the pressure P is the same as the inlet pressure P of the refrigerant at the inlet of the electronic expansion valve1An outlet pressure P of the refrigerant at an outlet of the electronic expansion valve2A flow area A of the electronic expansion valve, a liquid density ρ of the refrigerant, and a flow coefficient CDA discharge temperature T of the compressor, a discharge pressure P of the compressor, the compressorMinimum value T in the exhaust gas temperature rangeminMaximum value T in the discharge temperature range of the compressormaxThe minimum value P in the range of the discharge pressure of the compressorminMaximum value P in the discharge pressure range of the compressormaxThe discharge temperature of the compressor influences factor C1And a discharge pressure influence factor C of said compressor2The event of (2).
Further, the apparatus comprises:
a first processing module for processing if T < TminAnd P < PminAnd keeping the current opening degree of the electronic expansion valve.
Further, the apparatus comprises:
a second processing module for if T > TmaxOr P > PmaxAnd keeping the current opening degree of the electronic expansion valve.
Further, the first obtaining module includes:
a first sub-acquisition module for continuously acquiring the inlet pressure P of the refrigerant at the inlet of the electronic expansion valve in real time1An outlet pressure P of the refrigerant at an outlet of the electronic expansion valve2The flow area A of the electronic expansion valve, the exhaust temperature T of the compressor and the exhaust pressure P of the compressor;
a second sub-acquisition module for acquiring the liquid density ρ and the flow coefficient C of the refrigerantDMinimum value T in the discharge temperature range of the compressorminMaximum value T in the discharge temperature range of the compressormaxThe minimum value P in the range of the discharge pressure of the compressorminMaximum value P in the discharge pressure range of the compressormaxThe discharge temperature of the compressor influences factor C1And a discharge pressure influence factor C of said compressor2。
According to the technical scheme, the method has the advantages that: the exhaust temperature of the compressor is considered, the exhaust pressure of the compressor is also considered, the control of the electronic expansion valve is more accurate, and the problem that the electronic expansion valve is not accurately controlled due to the fact that the control of the electronic expansion valve is adjusted according to the exhaust temperature of the compressor is solved.
Drawings
Fig. 1 is a flowchart of a control method for applying an electronic expansion valve provided in an embodiment of the present application;
fig. 2 is a schematic diagram of a multi-split system provided by an embodiment of the present application;
fig. 3 is a functional block diagram of a control device to which an electronic expansion valve according to an embodiment of the present application is applied.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
As shown in fig. 1, an embodiment of the present application provides a control method of an electronic expansion valve, where the method includes the following steps:
step S101, acquiring inlet pressure P of refrigerant at inlet of electronic expansion valve1An outlet pressure P2 of the refrigerant at an outlet of the electronic expansion valve, a flow area A of the electronic expansion valve, a liquid density ρ of the refrigerant, and a flow coefficient CDThe discharge temperature T of the compressor, the discharge pressure P of the compressor and the minimum value T in the discharge temperature range of the compressorminMaximum value T in the discharge temperature range of the compressormaxThe minimum value P in the range of the discharge pressure of the compressorminMaximum value P in the discharge pressure range of the compressormaxThe discharge temperature of the compressor influences factor C1And a discharge pressure influence factor C of said compressor2。
As shown in fig. 2, a pressure sensor is respectively added before and after the electronic expansion valve, so that the inlet pressure P of the refrigerant at the inlet of the electronic expansion valve can be obtained1Outlet pressure P of refrigerant at outlet of electronic expansion valve2。
In the present embodiment, the inlet pressure P of the refrigerant at the inlet of the electronic expansion valve1And refrigerationOutlet pressure P of the agent at the outlet of the electronic expansion valve2The flow area a of the electronic expansion valve, the discharge temperature T of the compressor, and the discharge pressure P of the compressor can be obtained by reading the corresponding sensors.
In the present embodiment, the liquid density ρ and the flow coefficient C of the refrigerantDMinimum value T in exhaust temperature range of compressorminMaximum value T in discharge temperature range of compressormaxThe minimum value P in the range of the discharge pressure of the compressorminMaximum value P in discharge pressure range of compressormaxCompressor discharge temperature influencing factor C1And a discharge pressure influence factor C of the compressor2Can be input into the memory by the user and then read from the memory.
In the present embodiment, the flow coefficient CDIs determined by the type of refrigerant and the type of electronic expansion valve.
In the present embodiment, the discharge temperature of the compressor affects the factor C1Is determined by the capacity of the multi-split outdoor unit and the discharge temperature range of the compressor.
In the present embodiment, the discharge pressure of the compressor affects the factor C2Is determined by the capacity of the multi-split outdoor unit and the range of the discharge pressure of the compressor.
Step S102, according to a first formula:
Figure BDA0002394059990000061
and calculating the refrigerant flow m of the electronic expansion valve.
Obtaining an inlet pressure P of refrigerant at an inlet of the electronic expansion valve1Outlet pressure P of refrigerant at outlet of electronic expansion valve2Flow area A of the electronic expansion valve, liquid density ρ of the refrigerant, and flow coefficient CDThen, the corresponding numerical value is substituted into the first equation, and the refrigerant flow rate m of the electronic expansion valve is calculated.
Step S103, respectively enabling the exhaust temperature T of the compressor to be equal to the minimum value T in the exhaust temperature range of the compressorminRow of said compressorMaximum value T in air temperature rangemaxComparing the discharge pressure P of the compressor with the minimum value P in the discharge pressure range of the compressorminMaximum value P in the discharge pressure range of the compressormaxA comparison is made.
Step S104, if Tmin＜T＜TmaxAnd P ismin＜P＜PmaxThen, according to a second formula:
Figure BDA0002394059990000062
and calculating the target refrigerant flow m' of the electronic expansion valve.
Obtaining T from the comparison resultmin＜T＜TmaxAnd P ismin＜P＜PmaxThen, the minimum value T in the refrigerant flow m of the electronic expansion valve, the discharge temperature T of the compressor, the discharge pressure P of the compressor and the discharge temperature range of the compressor is obtainedminThe minimum value P in the range of the discharge pressure of the compressorminCompressor discharge temperature influencing factor C1And a discharge pressure influence factor C of the compressor2The value of (d) is substituted into the second equation, thereby calculating the target refrigerant flow rate m' of the electronic expansion valve.
Step S105, comparing the target refrigerant flow m' of the electronic expansion valve with the refrigerant flow m of the electronic expansion valve.
Step S106, if m' ≠ m, according to a third formula:
Figure BDA0002394059990000063
and calculating the target flow area A' of the electronic expansion valve.
If m '≠ m, the target flow area A' of the electronic expansion valve is calculated by correspondingly substituting the third formula according to the obtained values.
And S107, controlling the target opening degree of the electronic expansion valve according to the target flow area A' of the electronic expansion valve.
And controlling the opening degree of the electronic expansion valve to reach the opening degree corresponding to the target flow area A 'of the electronic expansion valve according to the relation between the target flow area A' of the electronic expansion valve and the opening degree of the electronic expansion valve, thereby controlling the target opening degree of the electronic expansion valve.
In this embodiment, before step S101, the method includes:
acquiring the working time of the compressor;
judging whether the working time is greater than a preset time or not;
if yes, triggering to acquire the inlet pressure P of the refrigerant at the inlet of the electronic expansion valve1An outlet pressure P of the refrigerant at an outlet of the electronic expansion valve2A flow area A of the electronic expansion valve, a liquid density ρ of the refrigerant, and a flow coefficient CDThe discharge temperature T of the compressor, the discharge pressure P of the compressor and the minimum value T in the discharge temperature range of the compressorminMaximum value T in the discharge temperature range of the compressormaxThe minimum value P in the range of the discharge pressure of the compressorminMaximum value P in the discharge pressure range of the compressormaxThe discharge temperature of the compressor influences factor C1And a discharge pressure influence factor C of said compressor2The event of (2).
The compressor is firstly operated for a preset time, and then corresponding data are obtained. Specifically, the electronic expansion valve of the indoor unit is in a standby opening degree in the first few minutes of the starting operation of the compressor, then the initial opening degree is determined according to the output capacity requirement of the compressor, and after the initial opening degree is maintained for a few minutes, corresponding data are obtained.
In the present embodiment, after step S103, the method includes:
if T is less than TminAnd P < PminAnd keeping the current opening degree of the electronic expansion valve.
When T is less than TminAnd P < PminIn the process, the electronic expansion valve is in the minimum opening degree and does not need to be adjusted or controlled, so that the current opening degree of the electronic expansion valve is maintained.
In the present embodiment, after step S103, the method includes:
if T > TmaxOr P > PmaxAnd keeping the current opening degree of the electronic expansion valve.
When T > TmaxOr P > PmaxIn the process, the electronic expansion valve is in the maximum opening degree and does not need to be adjusted or controlled, so that the current opening degree of the electronic expansion valve is maintained.
In this embodiment, step S101 includes:
continuous real-time acquisition of refrigerant inlet pressure P at inlet of electronic expansion valve1An outlet pressure P of the refrigerant at an outlet of the electronic expansion valve2The flow area A of the electronic expansion valve, the exhaust temperature T of the compressor and the exhaust pressure P of the compressor;
obtaining the liquid density rho and the flow coefficient C of the refrigerantDMinimum value T in the discharge temperature range of the compressorminMaximum value T in the discharge temperature range of the compressormaxThe minimum value P in the range of the discharge pressure of the compressorminMaximum value P in the discharge pressure range of the compressormaxThe discharge temperature of the compressor influences factor C1And a discharge pressure influence factor C of said compressor2。
Inlet pressure P of refrigerant at inlet of electronic expansion valve1Outlet pressure P of refrigerant at outlet of electronic expansion valve2The flow area A of the electronic expansion valve, the exhaust temperature T of the compressor and the exhaust pressure P of the compressor, which are continuously acquired in real time. Liquid density ρ and flow coefficient C of refrigerantDMinimum value T in exhaust temperature range of compressorminMaximum value T in discharge temperature range of compressormaxThe minimum value P in the range of the discharge pressure of the compressorminMaximum value P in discharge pressure range of compressormaxCompressor discharge temperature influencing factor C1And a discharge pressure influence factor C of the compressor2The data can be acquired only once in the same operation period, so that resources can be saved.
In some embodiments, after step S107, comprising:
step S101 is performed.
That is, step S101 is repeatedly executed to realize real-time control of the electronic expansion valve.
In conclusion, the exhaust temperature of the compressor is considered, the exhaust pressure of the compressor is also considered, the control of the electronic expansion valve is more accurate, and the problem that the control of the electronic expansion valve is adjusted according to the exhaust temperature of the compressor and the electronic expansion valve is not accurately controlled is solved.
As shown in fig. 3, an embodiment of the present application provides a control apparatus 1 for an electronic expansion valve, where the apparatus includes a first obtaining module 11, a first calculating module 12, a first comparing module 13, a second calculating module 14, a second comparing module 15, a third calculating module 16, and a control module 17.
A first obtaining module 11 for obtaining an inlet pressure P of the refrigerant at an inlet of the electronic expansion valve1An outlet pressure P of the refrigerant at an outlet of the electronic expansion valve2A flow area A of the electronic expansion valve, a liquid density ρ of the refrigerant, and a flow coefficient CDThe discharge temperature T of the compressor, the discharge pressure P of the compressor and the minimum value T in the discharge temperature range of the compressorminMaximum value T in the discharge temperature range of the compressormaxThe minimum value P in the range of the discharge pressure of the compressorminMaximum value P in the discharge pressure range of the compressormaxThe discharge temperature of the compressor influences factor C1And a discharge pressure influence factor C of said compressor2。
As shown in fig. 2, a pressure sensor is respectively added before and after the electronic expansion valve, so that the inlet pressure P of the refrigerant at the inlet of the electronic expansion valve can be obtained1Outlet pressure P of refrigerant at outlet of electronic expansion valve2。
In the present embodiment, the inlet pressure P of the refrigerant at the inlet of the electronic expansion valve1Outlet pressure P of refrigerant at outlet of electronic expansion valve2Obtaining the flow area A of the electronic expansion valve, the exhaust temperature T of the compressor and the exhaust pressure P of the compressorThe way is obtained by reading the corresponding sensor.
In the present embodiment, the liquid density ρ and the flow coefficient C of the refrigerantDMinimum value T in exhaust temperature range of compressorminMaximum value T in discharge temperature range of compressormaxThe minimum value P in the range of the discharge pressure of the compressorminMaximum value P in discharge pressure range of compressormaxCompressor discharge temperature influencing factor C1And a discharge pressure influence factor C of the compressor2Can be input into the memory by the user and then read from the memory.
In the present embodiment, the flow coefficient CDIs determined by the type of refrigerant and the type of electronic expansion valve.
In the present embodiment, the discharge temperature of the compressor affects the factor C1Is determined by the capacity of the multi-split outdoor unit and the discharge temperature range of the compressor.
In the present embodiment, the discharge pressure of the compressor affects the factor C2Is determined by the capacity of the multi-split outdoor unit and the range of the discharge pressure of the compressor.
A first calculation module 12 for, according to a first formula:
Figure BDA0002394059990000091
and calculating the refrigerant flow m of the electronic expansion valve.
Obtaining an inlet pressure P of refrigerant at an inlet of the electronic expansion valve1Outlet pressure P2 of refrigerant at outlet of electronic expansion valve, flow area A of electronic expansion valve, liquid density rho of refrigerant and flow coefficient CDThen, the corresponding numerical value is substituted into the first equation, and the refrigerant flow rate m of the electronic expansion valve is calculated.
A first comparing module 13, configured to compare the discharge temperature T of the compressor with a minimum value T in a discharge temperature range of the compressor respectivelyminMaximum value T in the discharge temperature range of the compressormaxComparing the discharge pressure P of the compressor with the discharge pressure range of the compressorMinimum value P in the circumferenceminMaximum value P in the discharge pressure range of the compressormaxA comparison is made.
A second calculation module 14 for calculating if Tmin＜T＜TmaxAnd P ismin＜P＜PmaxThen, according to a second formula:
Figure BDA0002394059990000092
and calculating the target refrigerant flow m' of the electronic expansion valve.
Obtaining T from the comparison resultmin＜T＜TmaxAnd P ismin＜P＜PmaxThen, the minimum value T in the refrigerant flow m of the electronic expansion valve, the discharge temperature T of the compressor, the discharge pressure P of the compressor and the discharge temperature range of the compressor is obtainedminThe minimum value P in the range of the discharge pressure of the compressorminCompressor discharge temperature influencing factor C1And a discharge pressure influence factor C of the compressor2The value of (d) is substituted into the second equation, thereby calculating the target refrigerant flow rate m' of the electronic expansion valve.
A second comparing module 15, configured to compare a target refrigerant flow m' of the electronic expansion valve with the refrigerant flow m of the electronic expansion valve.
A third calculation module 16 for, if m' ≠ m, calculating, according to a third formula:
Figure BDA0002394059990000093
and calculating the target flow area A' of the electronic expansion valve.
If m '≠ m, the target flow area A' of the electronic expansion valve is calculated by correspondingly substituting the third formula according to the obtained values.
And the control module 17 is configured to control a target opening degree of the electronic expansion valve according to the target flow area a' of the electronic expansion valve.
And controlling the opening degree of the electronic expansion valve to reach the opening degree corresponding to the target flow area A 'of the electronic expansion valve according to the relation between the target flow area A' of the electronic expansion valve and the opening degree of the electronic expansion valve, thereby controlling the target opening degree of the electronic expansion valve.
In the present embodiment, the apparatus 1 comprises:
the second acquisition module is used for acquiring the working time of the compressor;
the judging module is used for judging whether the working time is greater than the preset time or not;
a triggering module for triggering to acquire the inlet pressure P of the refrigerant at the inlet of the electronic expansion valve if the pressure P is the same as the inlet pressure P of the refrigerant at the inlet of the electronic expansion valve1An outlet pressure P of the refrigerant at an outlet of the electronic expansion valve2A flow area A of the electronic expansion valve, a liquid density ρ of the refrigerant, and a flow coefficient CDThe discharge temperature T of the compressor, the discharge pressure P of the compressor and the minimum value T in the discharge temperature range of the compressorminMaximum value T in the discharge temperature range of the compressormaxThe minimum value P in the range of the discharge pressure of the compressorminMaximum value P in the discharge pressure range of the compressormaxThe discharge temperature of the compressor influences factor C1And a discharge pressure influence factor C of said compressor2The event of (2).
The compressor is firstly operated for a preset time, and then corresponding data are obtained. Specifically, the electronic expansion valve of the indoor unit is in a standby opening degree in the first few minutes of the starting operation of the compressor, then the initial opening degree is determined according to the output capacity requirement of the compressor, and after the initial opening degree is maintained for a few minutes, corresponding data are obtained.
In the present embodiment, the apparatus 1 comprises:
a first processing module for processing if T < TminAnd P < PminAnd keeping the current opening degree of the electronic expansion valve.
When T is less than TminAnd P < PminIn the process, the electronic expansion valve is in the minimum opening degree and does not need to be adjusted or controlled, so that the current opening degree of the electronic expansion valve is maintained.
In the present embodiment, the apparatus 1 comprises:
a second processing module for if T > TmaxOr P > PmaxAnd keeping the current opening degree of the electronic expansion valve.
When T > TmaxOr P > PmaxIn the process, the electronic expansion valve is in the maximum opening degree and does not need to be adjusted or controlled, so that the current opening degree of the electronic expansion valve is maintained.
In this embodiment, the first obtaining module 11 includes:
a first sub-acquisition module for continuously acquiring the inlet pressure P of the refrigerant at the inlet of the electronic expansion valve in real time1An outlet pressure P of the refrigerant at an outlet of the electronic expansion valve2The flow area A of the electronic expansion valve, the exhaust temperature T of the compressor and the exhaust pressure P of the compressor;
a second sub-acquisition module for acquiring the liquid density ρ and the flow coefficient C of the refrigerantDMinimum value T in the discharge temperature range of the compressorminMaximum value T in the discharge temperature range of the compressormaxThe minimum value P in the range of the discharge pressure of the compressorminMaximum value P in the discharge pressure range of the compressormaxThe discharge temperature of the compressor influences factor C1And a discharge pressure influence factor C of said compressor2。
Inlet pressure P of refrigerant at inlet of electronic expansion valve1Outlet pressure P of refrigerant at outlet of electronic expansion valve2The flow area A of the electronic expansion valve, the exhaust temperature T of the compressor and the exhaust pressure P of the compressor, which are continuously acquired in real time. Liquid density ρ and flow coefficient C of refrigerantDMinimum value T in exhaust temperature range of compressorminMaximum value T in discharge temperature range of compressormaxThe minimum value P in the range of the discharge pressure of the compressorminMaximum value P in discharge pressure range of compressormaxCompressor discharge temperature influencing factor C1And a discharge pressure influence factor C of the compressor2The data can be acquired only once in the same operation period, so that resources can be saved.
In some embodiments, the apparatus 1 comprises:
and the repeated execution module is used for triggering the first acquisition module 11 again.
That is to say, the first obtaining module 11 is triggered repeatedly to work, so as to realize real-time control of the electronic expansion valve.
In conclusion, the exhaust temperature of the compressor is considered, the exhaust pressure of the compressor is also considered, the control of the electronic expansion valve is more accurate, and the problem that the control of the electronic expansion valve is adjusted according to the exhaust temperature of the compressor and the electronic expansion valve is not accurately controlled is solved.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (10)

1. A method of controlling an electronic expansion valve, the method comprising:
obtaining an inlet pressure P of a refrigerant at an inlet of an electronic expansion valve1An outlet pressure P of the refrigerant at an outlet of the electronic expansion valve2A flow area A of the electronic expansion valve, a liquid density ρ of the refrigerant, and a flow coefficient CDThe discharge temperature T of the compressor, the discharge pressure P of the compressor and the minimum value T in the discharge temperature range of the compressorminMaximum value T in the discharge temperature range of the compressormaxThe minimum value P in the range of the discharge pressure of the compressorminMaximum value P in the discharge pressure range of the compressormaxThe discharge temperature of the compressor influences factor C1And a discharge pressure influence factor C of said compressor2；
According to a first formula:
Figure FDA0002394059980000011
calculating the refrigerant flow m of the electronic expansion valve;
respectively connecting the discharge temperature T of the compressor with the temperature T of the compressorMinimum value T in exhaust temperature range of compressorminMaximum value T in the discharge temperature range of the compressormaxComparing the discharge pressure P of the compressor with the minimum value P in the discharge pressure range of the compressorminMaximum value P in the discharge pressure range of the compressormaxComparing;
if Tmin＜T＜TmaxAnd P ismin＜P＜PmaxThen, according to a second formula:
Figure FDA0002394059980000012
calculating the target refrigerant flow m' of the electronic expansion valve;
comparing a target refrigerant flow m' of the electronic expansion valve with a refrigerant flow m of the electronic expansion valve;
if m' ≠ m, then according to a third equation:
Figure FDA0002394059980000013
calculating a target flow area A' of the electronic expansion valve;
and controlling the target opening degree of the electronic expansion valve according to the target flow area A' of the electronic expansion valve.
2. The control method of an electronic expansion valve according to claim 1, wherein the obtaining of the inlet pressure P of the refrigerant at the inlet of the electronic expansion valve is performed in the step of obtaining the inlet pressure P of the refrigerant at the inlet of the electronic expansion valve1An outlet pressure P of the refrigerant at an outlet of the electronic expansion valve2A flow area A of the electronic expansion valve, a liquid density ρ of the refrigerant, and a flow coefficient CDThe discharge temperature T of the compressor, the discharge pressure P of the compressor and the minimum value T in the discharge temperature range of the compressorminMaximum value T in the discharge temperature range of the compressormaxThe minimum value P in the range of the discharge pressure of the compressorminMaximum value P in the discharge pressure range of the compressormaxThe discharge temperature of the compressor influences factor C1And the compressorExhaust pressure influencing factor C2Before the step (2), the method comprises the following steps:
acquiring the working time of the compressor;
judging whether the working time is greater than a preset time or not;
if yes, triggering to acquire the inlet pressure P of the refrigerant at the inlet of the electronic expansion valve1An outlet pressure P of the refrigerant at an outlet of the electronic expansion valve2A flow area A of the electronic expansion valve, a liquid density ρ of the refrigerant, and a flow coefficient CDThe discharge temperature T of the compressor, the discharge pressure P of the compressor and the minimum value T in the discharge temperature range of the compressorminMaximum value T in the discharge temperature range of the compressormaxThe minimum value P in the range of the discharge pressure of the compressorminMaximum value P in the discharge pressure range of the compressormaxThe discharge temperature of the compressor influences factor C1And a discharge pressure influence factor C of said compressor2The event of (2).
3. The control method of an electronic expansion valve according to claim 1, characterized in that a minimum value T in the range of said dividing the discharge temperature T of the compressor and the discharge temperature T of the compressor, respectivelyminMaximum value T in the discharge temperature range of the compressormaxComparing the discharge pressure P of the compressor with the minimum value P in the discharge pressure range of the compressorminMaximum value P in the discharge pressure range of the compressormaxAfter the step of comparing, comprising:
if T is less than TminAnd P < PminAnd keeping the current opening degree of the electronic expansion valve.
4. The control method of an electronic expansion valve according to claim 1, characterized in that a minimum value T in the range of said dividing the discharge temperature T of the compressor and the discharge temperature T of the compressor, respectivelyminMaximum value T in the discharge temperature range of the compressormaxMake a comparison toAnd respectively enabling the discharge pressure P of the compressor to be respectively equal to the minimum value P in the discharge pressure range of the compressorminMaximum value P in the discharge pressure range of the compressormaxAfter the step of comparing, comprising:
if T > TmaxOr P > PmaxAnd keeping the current opening degree of the electronic expansion valve.
5. The control method of an electronic expansion valve according to claim 1, wherein the obtaining of the inlet pressure P of the refrigerant at the inlet of the electronic expansion valve is performed in the step of obtaining the inlet pressure P of the refrigerant at the inlet of the electronic expansion valve1An outlet pressure P of the refrigerant at an outlet of the electronic expansion valve2A flow area A of the electronic expansion valve, a liquid density ρ of the refrigerant, and a flow coefficient CDThe discharge temperature T of the compressor, the discharge pressure P of the compressor and the minimum value T in the discharge temperature range of the compressorminMaximum value T in the discharge temperature range of the compressormaxThe minimum value P in the range of the discharge pressure of the compressorminMaximum value P in the discharge pressure range of the compressormaxThe discharge temperature of the compressor influences factor C1And a discharge pressure influence factor C of said compressor2In the step (2), comprising:
continuous real-time acquisition of refrigerant inlet pressure P at inlet of electronic expansion valve1An outlet pressure P of the refrigerant at an outlet of the electronic expansion valve2The flow area A of the electronic expansion valve, the exhaust temperature T of the compressor and the exhaust pressure P of the compressor;
obtaining the liquid density rho and the flow coefficient C of the refrigerantDMinimum value T in the discharge temperature range of the compressorminMaximum value T in the discharge temperature range of the compressormaxThe minimum value P in the range of the discharge pressure of the compressorminMaximum value P in the discharge pressure range of the compressormaxThe discharge temperature of the compressor influences factor C1And a discharge pressure influence factor C of said compressor2。
6. A control device for an electronic expansion valve, the device comprising:
a first obtaining module for obtaining an inlet pressure P of the refrigerant at an inlet of the electronic expansion valve1An outlet pressure P of the refrigerant at an outlet of the electronic expansion valve2A flow area A of the electronic expansion valve, a liquid density ρ of the refrigerant, and a flow coefficient CDThe discharge temperature T of the compressor, the discharge pressure P of the compressor and the minimum value T in the discharge temperature range of the compressorminMaximum value T in the discharge temperature range of the compressormaxThe minimum value P in the range of the discharge pressure of the compressorminMaximum value P in the discharge pressure range of the compressormaxThe discharge temperature of the compressor influences factor C1And a discharge pressure influence factor C of said compressor2；
A first calculation module to:
Figure FDA0002394059980000031
calculating the refrigerant flow m of the electronic expansion valve;
a first comparing module for comparing the discharge temperature T of the compressor with the minimum value T in the discharge temperature range of the compressorminMaximum value T in the discharge temperature range of the compressormaxComparing the discharge pressure P of the compressor with the minimum value P in the discharge pressure range of the compressorminMaximum value P in the discharge pressure range of the compressormaxComparing;
a second calculation module for calculating if Tmin＜T＜TmaxAnd P ismin＜P＜PmaxThen, according to a second formula:
Figure FDA0002394059980000032
calculating the target refrigerant flow m' of the electronic expansion valve;
the second comparison module is used for comparing the target refrigerant flow m' of the electronic expansion valve with the refrigerant flow m of the electronic expansion valve;
a third calculation module for, if m' ≠ m, according to a third formula:
Figure FDA0002394059980000033
calculating a target flow area A' of the electronic expansion valve;
and the control module is used for controlling the target opening degree of the electronic expansion valve according to the target flow area A' of the electronic expansion valve.
7. Control device for an electronic expansion valve according to claim 6, characterized in that the device comprises:
the second acquisition module is used for acquiring the working time of the compressor;
the judging module is used for judging whether the working time is greater than the preset time or not;
a triggering module for triggering to acquire the inlet pressure P of the refrigerant at the inlet of the electronic expansion valve if the pressure P is the same as the inlet pressure P of the refrigerant at the inlet of the electronic expansion valve1An outlet pressure P of the refrigerant at an outlet of the electronic expansion valve2A flow area A of the electronic expansion valve, a liquid density ρ of the refrigerant, and a flow coefficient CDThe discharge temperature T of the compressor, the discharge pressure P of the compressor and the minimum value T in the discharge temperature range of the compressorminMaximum value T in the discharge temperature range of the compressormaxThe minimum value P in the range of the discharge pressure of the compressorminMaximum value P in the discharge pressure range of the compressormaxThe discharge temperature of the compressor influences factor C1And a discharge pressure influence factor C of said compressor2The event of (2).
8. Control device for an electronic expansion valve according to claim 6, characterized in that the device comprises:
a first processing module for processing if T < TminAnd P < PminThen keeping the electronic expansion valveThe front opening degree.
9. Control device for an electronic expansion valve according to claim 6, characterized in that the device comprises:
a second processing module for if T > TmaxOr P > PmaxAnd keeping the current opening degree of the electronic expansion valve.
10. The control device of an electronic expansion valve according to claim 6, wherein the first obtaining module comprises:
a first sub-acquisition module for continuously acquiring the inlet pressure P of the refrigerant at the inlet of the electronic expansion valve in real time1An outlet pressure P of the refrigerant at an outlet of the electronic expansion valve2The flow area A of the electronic expansion valve, the exhaust temperature T of the compressor and the exhaust pressure P of the compressor;
a second sub-acquisition module for acquiring the liquid density ρ and the flow coefficient C of the refrigerantDMinimum value T in the discharge temperature range of the compressorminMaximum value T in the discharge temperature range of the compressormaxThe minimum value P in the range of the discharge pressure of the compressorminMaximum value P in the discharge pressure range of the compressormaxThe discharge temperature of the compressor influences factor C1And a discharge pressure influence factor C of said compressor2。
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