CN108278713B - Pressure control method and device - Google Patents

Pressure control method and device Download PDF

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Publication number
CN108278713B
CN108278713B CN201810054562.2A CN201810054562A CN108278713B CN 108278713 B CN108278713 B CN 108278713B CN 201810054562 A CN201810054562 A CN 201810054562A CN 108278713 B CN108278713 B CN 108278713B
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temperature
pressure sensor
control
pressure
frequency
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CN108278713A (en
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谷月明
王传华
张建鹏
宋鹏
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

The application provides a pressure control method and a pressure control device, wherein the method comprises the following steps: receiving a system pressure judgment result, and if the system pressure judgment result is overvoltage, sending a prejudgment control signal; respectively detecting the temperature, the ambient temperature and the exhaust temperature of the high-pressure sensor according to the pre-judgment control signal; controlling the system pressure using at least any two of the following operations: the control method comprises the steps of executing compressor frequency control operation according to the temperature of the high-pressure sensor, executing fan gear control operation according to the temperature of the high-pressure sensor and the ambient temperature, and executing electronic expansion valve opening degree control operation according to exhaust temperature. The technical effect of realizing automatic control of system pressure and guaranteeing the stability of the system pressure is achieved.

Description

Pressure control method and device
Technical Field
The application relates to the field of automation control, in particular to a pressure control method and device.
Background
In an air conditioning system, safety protection measures are set for ensuring the healthy and stable operation of the system, wherein high-voltage measure protection is an important protection measure.
In an air conditioning system, since the risk of high pressure explosion and the like exists due to the overhigh system pressure, high pressure protection measures are often needed. The existing high-voltage protection measures usually adopt a mechanical control method, specifically, when the system pressure exceeds a risk pressure value, an air conditioner operation system is stopped, and then system faults are solved manually.
The inventor finds that in the existing mechanical control method, because the set risk pressure value is usually high, the system can still operate in a high-pressure state slightly lower than the risk pressure value, so that certain impact and influence are caused on the system, and meanwhile, when the system exceeds the risk pressure value, the system stops operating, so that system faults need to be solved in a manual mode, and normal use is also influenced.
Disclosure of Invention
The embodiment of the application provides a pressure control method and device, which can realize automatic control of system pressure so as to ensure the stability of the system pressure.
In one embodiment, a pressure control method includes:
receiving a system pressure judgment result, and if the system pressure judgment result is greater than a preset pressure, sending a pre-judgment control signal;
respectively detecting the temperature, the ambient temperature and the exhaust temperature of the high-pressure sensor according to the pre-judgment control signal;
controlling the system pressure using at least any two of the following operations: the control method comprises the steps of executing compressor frequency control operation according to the temperature of the high-pressure sensor, executing fan gear control operation according to the temperature of the high-pressure sensor and the ambient temperature, and executing electronic expansion valve opening degree control operation according to exhaust temperature.
In one embodiment, said performing a compressor frequency control operation according to a temperature of said high pressure sensor comprises: and if the temperature of the high-pressure sensor is greater than or equal to the basic temperature threshold value, executing the frequency-limiting operation of the compressor.
In one embodiment, if the temperature of the high pressure sensor is greater than or equal to the base temperature threshold, performing a compressor frequency limiting operation includes:
acquiring the temperature of a first-time high-pressure sensor at intervals of a first preset time period, and reducing the frequency of the compressor by a first preset frequency value if the temperature of the first-time high-pressure sensor is greater than or equal to a first temperature and the frequency of the compressor is greater than a lowest frequency value; the first temperature is: the base temperature threshold plus 4 degrees celsius.
In one embodiment, the pressure control method further comprises: acquiring the temperature of the secondary high-voltage sensor at intervals of the first preset time period; if the temperature of the secondary high-pressure sensor is greater than or equal to the first temperature and the frequency of the compressor is greater than the lowest frequency value, reducing a second preset frequency value of the frequency of the compressor; or if the temperature of the secondary high-pressure sensor is in the range from the second temperature to the third temperature, the frequency of the compressor is unchanged; the second temperature is: subtracting 2 ℃ from the base temperature threshold; the third temperature is: the base temperature threshold plus 3 degrees celsius.
In one embodiment, the pressure control method further comprises: acquiring the temperature of the high-voltage sensor for the third time at intervals of the first preset time period; if the temperature of the third-time high-pressure sensor is greater than or equal to the first temperature and the compressor frequency is greater than the lowest frequency value, reducing a third preset frequency value of the compressor frequency; or, if the temperature of the third-time high-pressure sensor is in the range from the second temperature to the third temperature, the frequency of the compressor is unchanged; the second temperature is: subtracting 2 ℃ from the base temperature threshold; the third temperature is: the base temperature threshold plus 3 degrees celsius.
In one embodiment, the pressure control method further comprises: and taking the temperature of the high-pressure sensor after the execution of the compressor frequency control as the temperature after the execution of the high-pressure sensor, detecting the temperature after the execution of the high-pressure sensor, and adjusting the compressor frequency according to the temperature after the execution of the high-pressure sensor.
In one embodiment, said adjusting said compressor frequency based on said post-high pressure sensor execution temperature comprises:
if the temperature is in the range from the first temperature to the fourth temperature after the high-pressure sensor is executed, keeping the frequency of the compressor unchanged; alternatively, the first and second electrodes may be,
if the temperature of the high-pressure sensor is lower than a fifth temperature after execution, updating the frequency of the compressor after a second preset time interval;
the first temperature is: adding 4 ℃ to the base temperature threshold; the fourth temperature is: adding 5 ℃ to the basic temperature threshold; the fifth temperature is: the base temperature threshold is reduced by 3 degrees celsius.
In one embodiment, the base temperature threshold is determined as a function of defrost temperature.
In one embodiment, said determining said basal temperature threshold as a function of defrost temperature comprises:
if the defrosting temperature is higher than or equal to-13 ℃, the basic temperature threshold is 58 ℃; alternatively, the first and second electrodes may be,
if the defrosting temperature is lower than-13 ℃, the basic temperature threshold is obtained by adopting the following formula:
P=1.5Tdefrosting cream+80 degrees Celsius;
p represents a basic temperature threshold value, and the unit is centigrade; t isDefrosting creamThe defrosting temperature is expressed in degrees centigrade.
In one embodiment, the performing a fan gear control operation based on the temperature of the high pressure sensor and the ambient temperature includes:
if the ambient temperature is greater than or equal to 45 ℃, adjusting the fan to the highest gear; alternatively, the first and second electrodes may be,
and if the ambient temperature is less than 45 ℃, executing the gear control operation of the fan according to the temperature of the high-pressure sensor.
In one embodiment, when the ambient temperature is less than 45 degrees celsius, the executing the fan gear control operation according to the temperature of the high-pressure sensor includes:
if the temperature of the high-pressure sensor is higher than 35 ℃ and the temperature of the high-pressure sensor is lower than or equal to 45 ℃, keeping the current gear of the fan; alternatively, the first and second electrodes may be,
if the temperature of the high-pressure sensor is higher than 45 ℃, the gear of the fan is increased by one gear; alternatively, the first and second electrodes may be,
and if the temperature of the high-pressure sensor is less than or equal to 35 ℃, the gear of the fan is lowered by one gear.
In one embodiment, after the gear of the fan is shifted up or down by one gear, the method further includes:
after a third preset time period, acquiring the temperature of the high-voltage sensor;
if the obtained temperature of the high-pressure sensor is higher than 45 ℃, the gear of the fan is increased by one gear; or if the acquired temperature of the high-pressure sensor is less than or equal to 35 ℃, the gear of the fan is lowered by one gear.
In one embodiment, the performing an electronic expansion valve opening degree control operation according to an exhaust gas temperature includes:
if the exhaust temperature is lower than 92 ℃, the electronic expansion valve recovers superheat degree control; alternatively, the first and second electrodes may be,
if the exhaust temperature is greater than or equal to 95 ℃ and the exhaust temperature is less than 102 ℃, adding 5 steps to the opening of the electronic expansion valve; alternatively, the first and second electrodes may be,
and if the exhaust temperature is greater than or equal to 102 ℃ and the exhaust temperature is less than 105 ℃, adding 10 steps to the opening degree of the electronic expansion valve.
In one embodiment, a pressure control device includes: the device comprises a signal generation module, a detection starting module and an adjustment module; wherein the content of the first and second substances,
the signal generation module is used for receiving a system pressure judgment result and sending a prejudgment control signal if the system pressure judgment result is greater than a preset pressure;
the detection starting module is used for respectively detecting the temperature, the ambient temperature and the exhaust temperature of the high-pressure sensor according to the pre-judgment control signal;
the adjustment module is configured to control the system pressure using at least any two of the following operations: the control method comprises the steps of executing compressor frequency control operation according to the temperature of the high-pressure sensor, executing fan gear control operation according to the temperature of the high-pressure sensor and the ambient temperature, and executing electronic expansion valve opening degree control operation according to exhaust temperature.
In one embodiment, the adjustment module includes any two of: the system comprises a frequency control module, a gear control module and an electronic expansion valve control module;
the frequency control module is used for executing the frequency control operation of the compressor according to the temperature of the high-pressure sensor;
the gear control module is used for executing gear control operation of the fan according to the temperature of the high-pressure sensor and the ambient temperature;
and the electronic expansion valve control module is used for executing opening degree control operation of the electronic expansion valve according to the exhaust temperature.
In one embodiment, the frequency control module is specifically configured to perform a compressor frequency limiting operation when the temperature of the high pressure sensor is greater than or equal to a base temperature threshold.
In an embodiment, the frequency control module is further specifically configured to detect a temperature of a high pressure sensor after the execution of the compressor frequency control, that is, a temperature after the execution of the high pressure sensor, and adjust the compressor frequency according to the temperature after the execution of the high pressure sensor.
In the above embodiment, by using the pressure control method and apparatus provided in the embodiments of the present application, it is possible to perform pre-judgment analysis processing in advance before the system is impacted by high pressure, so as to implement pressure control. In the process of pressure control, any two modes of opening control of the electronic expansion valve, frequency control of the compressor and gear control of the fan are adopted, automatic control of system pressure is achieved, manual processing is not needed, the system pressure can be guaranteed to be within a normal range, and the occurrence probability of system faults is reduced.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application. In the drawings:
FIG. 1 is a flow chart of a pressure control method of one embodiment of the present application;
FIG. 2 is a block diagram of a pressure control device according to one embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be described in further detail below with reference to the accompanying drawings. The exemplary embodiments and descriptions of the present application are provided to explain the present application and not to limit the present application.
Fig. 1 is a flow chart of a pressure control method according to an embodiment of the present application. As shown in fig. 1, the pressure control method may include the following steps.
S101: and receiving a system pressure judgment result, and sending a pre-judgment control signal if the system pressure judgment result is greater than the preset pressure.
The system pressure determination result may be a result of determining whether the system pressure is greater than a preset pressure.
The predictive control signal may be a command for performing pressure control.
S102: and respectively detecting the temperature, the ambient temperature and the exhaust temperature of the high-pressure sensor according to the pre-judgment control signal.
According to the prejudgment control signal, the temperature, the environment temperature and the exhaust temperature of the high-pressure sensor can be respectively monitored in real time.
S103: controlling the system pressure using at least any two of the following operations: the control method comprises the steps of executing compressor frequency control operation according to the temperature of the high-pressure sensor, executing fan gear control operation according to the temperature of the high-pressure sensor and the ambient temperature, and executing electronic expansion valve opening degree control operation according to exhaust temperature.
According to the temperature of the high pressure sensor, a control operation of the compressor frequency may be performed.
In one embodiment, a compressor frequency limiting operation may be performed if the temperature of the high pressure sensor is greater than or equal to a base temperature threshold.
In one embodiment, the base temperature threshold may be determined as a function of the defrost temperature.
Specifically, if the defrosting temperature is greater than or equal to-13 ℃, the base temperature threshold may be 58 ℃; alternatively, the first and second electrodes may be,
if the defrosting temperature is less than-13 ℃, the basic temperature threshold may be:
P=1.5Tdefrosting cream+80 degrees Celsius; wherein P may represent a base temperature thresholdValues in degrees Celsius, TDefrosting creamThe defrost temperature may be expressed in degrees celsius.
In an embodiment, if the temperature of the high pressure sensor is greater than or equal to the base temperature threshold, the performing the frequency limiting operation of the compressor may specifically include: the temperature of the first-time high-pressure sensor can be acquired at intervals of a first preset time period, and if the temperature of the first-time high-pressure sensor is greater than or equal to a first temperature and the compressor frequency is greater than a lowest frequency value, the compressor frequency can be reduced by a first preset frequency value. Wherein the first temperature may be: the base temperature threshold plus 4 degrees celsius. The first preset frequency value may be 15 hz.
In another embodiment, the method may further comprise: the temperature of a secondary high-pressure sensor can be obtained at intervals of the first preset time period, and if the temperature of the secondary high-pressure sensor is greater than or equal to the first temperature and the compressor frequency is greater than the lowest frequency value, a second preset frequency value of the compressor frequency can be reduced; alternatively, if the temperature of the second secondary high pressure sensor is in the range of the second temperature to the third temperature, the compressor frequency may be unchanged. Wherein the second temperature may be: the base temperature threshold is reduced by 2 degrees celsius. The third temperature may be: the base temperature threshold plus 3 degrees celsius. The second preset frequency value may be 12 hz.
In another embodiment, the method may further comprise: the temperature of a third-time high-pressure sensor can be obtained at intervals of the first preset time period, and if the temperature of the third-time high-pressure sensor is greater than or equal to the first temperature and the compressor frequency is greater than the lowest frequency value, a third preset frequency value of the compressor frequency can be reduced; alternatively, if the temperature of the third tertiary high pressure sensor is in the range of the second temperature to the third temperature, the compressor frequency may be unchanged. Wherein the third preset frequency value may be 8 hz.
In one embodiment, the first preset time period may be 30 to 50 seconds, for example, 40 seconds.
In another embodiment, after performing the compressor frequency limiting operation, the method may further include: and taking the temperature of the high-pressure sensor after the execution of the compressor frequency control as the temperature after the execution of the high-pressure sensor, detecting the temperature after the execution of the high-pressure sensor, and adjusting the compressor frequency according to the temperature after the execution of the high-pressure sensor.
In an embodiment, the adjusting the compressor frequency according to the temperature after the high pressure sensor is executed may specifically include: if the temperature of the high-pressure sensor is in the range from the first temperature to the fourth temperature after the high-pressure sensor is operated, the frequency of the compressor can be kept unchanged; or if the temperature after the high-pressure sensor is executed is less than a fifth temperature, updating the frequency of the compressor after a second preset time interval. Wherein the first temperature may be: the base temperature threshold plus 4 degrees celsius. The fourth temperature may be: the base temperature threshold plus 5 degrees celsius. The fifth temperature may be: the base temperature threshold is reduced by 3 degrees celsius.
In one embodiment, the second preset time period may be 2 minutes.
In one embodiment, the performing of the fan shift control operation according to the temperature of the high pressure sensor and the ambient temperature may include: if the ambient temperature is greater than or equal to 45 ℃, adjusting the fan to the highest gear; or if the ambient temperature is lower than 45 ℃, executing the gear control operation of the fan according to the temperature of the high-pressure sensor.
In one embodiment, when the ambient temperature is less than 45 degrees celsius, the performing the fan gear control operation according to the temperature of the high-pressure sensor may include: if the temperature of the high-pressure sensor is higher than 35 ℃ and the temperature of the high-pressure sensor is lower than or equal to 45 ℃, keeping the current gear of the fan; or if the temperature of the high-pressure sensor is higher than 45 ℃, the gear of the fan is increased; or if the temperature of the high-pressure sensor is less than or equal to 35 ℃, the gear of the fan is lowered by one gear.
In another embodiment, after the gear of the fan is shifted up or down by one gear, the method may further include: after a third preset time period, acquiring the temperature of the high-voltage sensor; if the obtained temperature of the high-pressure sensor is higher than 45 ℃, the gear of the fan is increased by one gear; or if the acquired temperature of the high-pressure sensor is less than or equal to 35 ℃, the gear of the fan is lowered by one gear until the lowest gear.
In one embodiment, the third preset time period may be 60 seconds.
In one embodiment, the performing an electronic expansion valve opening degree control operation according to an exhaust gas temperature may specifically include: if the exhaust temperature is lower than 92 ℃, the electronic expansion valve recovers superheat degree control; or if the exhaust temperature is greater than or equal to 95 ℃ and the exhaust temperature is less than 102 ℃, adding 5 steps to the opening of the electronic expansion valve; or if the exhaust temperature is greater than or equal to 102 ℃ and the exhaust temperature is less than 105 ℃, adding 10 steps to the opening of the electronic expansion valve.
From the above description, it can be seen that the embodiments of the present application achieve the following technical effects: before the system is impacted by high pressure, the pre-judgment analysis processing is carried out in advance to realize pressure control. In the process of pressure control, any two modes of opening control of the electronic expansion valve, frequency control of the compressor and gear control of the fan are adopted, automatic control of system pressure is achieved, manual processing is not needed, the system pressure can be guaranteed to be within a normal range, and the occurrence probability of system faults is reduced.
Based on the same inventive concept, the embodiment of the present application further provides a pressure control device, as described in the following embodiments. Because the principle of the pressure control device for solving the problems is similar to the pressure control method, the implementation of the pressure control device can refer to the implementation of the pressure control method, and repeated details are not repeated. As used hereinafter, the term "unit" or "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated.
Fig. 2 is a block diagram of a pressure control apparatus according to an embodiment of the present application, and as shown in fig. 2, the pressure control apparatus may include: a signal generation module 201, a detection start module 202 and an adjustment module 203.
The signal generating module 201 may be configured to receive a system pressure determination result, and send a pre-determination control signal if the system pressure determination result is an overpressure.
The detection starting module 202 may be configured to detect the temperature of the high pressure sensor, the ambient temperature, and the exhaust temperature according to the predetermined control signal.
The adjustment module 203 may be configured to control the system pressure using at least any two of the following operations: the control method comprises the steps of executing compressor frequency control operation according to the temperature of the high-pressure sensor, executing fan gear control operation according to the temperature of the high-pressure sensor and the ambient temperature, and executing electronic expansion valve opening degree control operation according to exhaust temperature.
In one embodiment, the adjusting module 203 may include any two of the following (three are shown in the drawing): a frequency control module 2031, a gear control module 2032, and an electronic expansion valve control module 2033.
The frequency control module 2031 may be configured to perform a compressor frequency control operation based on the temperature of the high pressure sensor.
The gear control module 2032 may be configured to perform a fan gear control operation according to the temperature of the high-pressure sensor and the ambient temperature.
The electronic expansion valve control module 2033 may be configured to perform an electronic expansion valve opening control operation based on the exhaust temperature.
In one embodiment, the frequency control module 2031 may be specifically configured to perform a compressor frequency limiting operation when the temperature of the high pressure sensor is greater than or equal to a base temperature threshold.
In another embodiment, the frequency control module 2031 may be further configured to detect a temperature of a high pressure sensor after the execution of the compressor frequency control, that is, a temperature after the execution of the high pressure sensor, and adjust the compressor frequency according to the temperature after the execution of the high pressure sensor.
It will be apparent to those skilled in the art that the modules or steps of the embodiments of the present application described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different from that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, embodiments of the present application are not limited to any specific combination of hardware and software.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and it will be apparent to those skilled in the art that various modifications and variations can be made in the embodiment of the present application. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (12)

1. A pressure control method, comprising:
receiving a system pressure judgment result, and if the system pressure judgment result is greater than a preset pressure, sending a pre-judgment control signal;
respectively detecting the temperature, the ambient temperature and the exhaust temperature of the high-pressure sensor according to the pre-judgment control signal;
controlling the system pressure using at least any two of the following operations: executing a compressor frequency control operation according to the temperature of the high-pressure sensor, executing a fan gear control operation according to the temperature of the high-pressure sensor and the ambient temperature, and executing an electronic expansion valve opening degree control operation according to the exhaust temperature;
the performing of the compressor frequency control operation according to the temperature of the high pressure sensor includes: if the temperature of the high-pressure sensor is greater than or equal to the basic temperature threshold value, executing the frequency-limiting operation of the compressor;
according to high pressure sensor's temperature and ambient temperature carry out fan gear control operation, include:
if the ambient temperature is greater than or equal to 45 ℃, adjusting the fan to the highest gear; alternatively, the first and second electrodes may be,
if the ambient temperature is lower than 45 ℃, executing fan gear control operation according to the temperature of the high-pressure sensor;
when ambient temperature is less than 45 degrees centigrade, according to high pressure sensor's temperature execution fan gear control operation includes:
if the temperature of the high-pressure sensor is higher than 35 ℃ and the temperature of the high-pressure sensor is lower than or equal to 45 ℃, keeping the current gear of the fan; alternatively, the first and second electrodes may be,
if the temperature of the high-pressure sensor is higher than 45 ℃, the gear of the fan is increased by one gear; alternatively, the first and second electrodes may be,
and if the temperature of the high-pressure sensor is less than or equal to 35 ℃, the gear of the fan is lowered by one gear.
2. The pressure control method of claim 1, wherein if the temperature of the high pressure sensor is greater than or equal to the base temperature threshold, the performing the compressor frequency limiting operation comprises:
acquiring the temperature of a first-time high-pressure sensor at intervals of a first preset time period, and reducing the frequency of the compressor by a first preset frequency value if the temperature of the first-time high-pressure sensor is greater than or equal to a first temperature and the frequency of the compressor is greater than a lowest frequency value;
the first temperature is: the base temperature threshold plus 4 degrees celsius.
3. A pressure control method according to claim 2, characterized by further comprising:
acquiring the temperature of the secondary high-voltage sensor at intervals of the first preset time period;
if the temperature of the secondary high-pressure sensor is greater than or equal to the first temperature and the frequency of the compressor is greater than the lowest frequency value, reducing a second preset frequency value of the frequency of the compressor; or if the temperature of the secondary high-pressure sensor is in the range from the second temperature to the third temperature, the frequency of the compressor is unchanged;
the second temperature is: subtracting 2 ℃ from the base temperature threshold; the third temperature is: the base temperature threshold plus 3 degrees celsius.
4. A pressure control method according to claim 3, characterized by further comprising:
acquiring the temperature of the high-voltage sensor for the third time at intervals of the first preset time period;
if the temperature of the third-time high-pressure sensor is greater than or equal to the first temperature and the compressor frequency is greater than the lowest frequency value, reducing a third preset frequency value of the compressor frequency; or, if the temperature of the third-time high-pressure sensor is in the range from the second temperature to the third temperature, the frequency of the compressor is not changed.
5. A pressure control method as claimed in claim 1, characterized in that the method further comprises: and taking the temperature of the high-pressure sensor after the execution of the compressor frequency control as the temperature after the execution of the high-pressure sensor, detecting the temperature after the execution of the high-pressure sensor, and adjusting the compressor frequency according to the temperature after the execution of the high-pressure sensor.
6. The pressure control method of claim 5, wherein said adjusting the compressor frequency based on the post-execution temperature of the high pressure sensor comprises:
if the temperature is in the range from the first temperature to the fourth temperature after the high-pressure sensor is executed, keeping the frequency of the compressor unchanged; alternatively, the first and second electrodes may be,
if the temperature of the high-pressure sensor is lower than a fifth temperature after execution, updating the frequency of the compressor after a second preset time interval;
the first temperature is: adding 4 ℃ to the base temperature threshold; the fourth temperature is: adding 5 ℃ to the basic temperature threshold; the fifth temperature is: the base temperature threshold is reduced by 3 degrees celsius.
7. A pressure control method according to any one of claims 1-6, characterised in that the base temperature threshold is determined in dependence on the defrost temperature.
8. The pressure control method of claim 7, wherein said determining the base temperature threshold based on a defrost temperature comprises:
if the defrosting temperature is higher than or equal to-13 ℃, the basic temperature threshold is 58 ℃; alternatively, the first and second electrodes may be,
if the defrosting temperature is lower than-13 ℃, the basic temperature threshold is obtained by adopting the following formula:
P=1.5Tdefrosting cream+80;
P represents a basic temperature threshold value, and the unit is centigrade; t isDefrosting creamThe defrosting temperature is expressed in degrees centigrade.
9. The pressure control method of claim 8, wherein after the gear of the fan is shifted up or down, the method further comprises:
after a third preset time period, acquiring the temperature of the high-voltage sensor;
if the obtained temperature of the high-pressure sensor is higher than 45 ℃, the gear of the fan is increased by one gear; or if the acquired temperature of the high-pressure sensor is less than or equal to 35 ℃, the gear of the fan is lowered by one gear.
10. A pressure control method according to claim 1, wherein said performing an electronic expansion valve opening degree control operation based on an exhaust gas temperature comprises:
if the exhaust temperature is lower than 92 ℃, the electronic expansion valve recovers superheat degree control; alternatively, the first and second electrodes may be,
if the exhaust temperature is greater than or equal to 95 ℃ and the exhaust temperature is less than 102 ℃, adding 5 steps to the opening of the electronic expansion valve; alternatively, the first and second electrodes may be,
and if the exhaust temperature is greater than or equal to 102 ℃ and the exhaust temperature is less than 105 ℃, adding 10 steps to the opening degree of the electronic expansion valve.
11. A pressure control device, comprising: the device comprises a signal generation module, a detection starting module and an adjustment module; wherein the content of the first and second substances,
the signal generation module is used for receiving a system pressure judgment result and sending a prejudgment control signal if the system pressure judgment result is greater than a preset pressure;
the detection starting module is used for respectively detecting the temperature, the ambient temperature and the exhaust temperature of the high-pressure sensor according to the pre-judgment control signal;
the adjustment module is configured to control the system pressure using at least any two of the following operations: executing a compressor frequency control operation according to the temperature of the high-pressure sensor, executing a fan gear control operation according to the temperature of the high-pressure sensor and the ambient temperature, and executing an electronic expansion valve opening degree control operation according to the exhaust temperature;
the adjustment module includes any two of: the system comprises a frequency control module, a gear control module and an electronic expansion valve control module;
the frequency control module is used for executing the frequency control operation of the compressor according to the temperature of the high-pressure sensor;
the gear control module is used for executing gear control operation of the fan according to the temperature of the high-pressure sensor and the ambient temperature;
the electronic expansion valve control module is used for executing opening degree control operation of the electronic expansion valve according to the exhaust temperature;
the frequency control module is specifically configured to: performing a compressor frequency limiting operation when the temperature of the high pressure sensor is greater than or equal to a base temperature threshold;
the gear control module is specifically configured to: if the ambient temperature is greater than or equal to 45 ℃, adjusting the fan to the highest gear; or if the ambient temperature is lower than 45 ℃, executing the gear control operation of the fan according to the temperature of the high-pressure sensor;
when ambient temperature is less than 45 degrees centigrade, according to high pressure sensor's temperature execution fan gear control operation includes:
if the temperature of the high-pressure sensor is higher than 35 ℃ and the temperature of the high-pressure sensor is lower than or equal to 45 ℃, keeping the current gear of the fan; alternatively, the first and second electrodes may be,
if the temperature of the high-pressure sensor is higher than 45 ℃, the gear of the fan is increased by one gear; alternatively, the first and second electrodes may be,
and if the temperature of the high-pressure sensor is less than or equal to 35 ℃, the gear of the fan is lowered by one gear.
12. The pressure control device according to claim 11, wherein the frequency control module is further configured to detect a temperature of a high pressure sensor after performing the frequency control of the compressor, that is, a temperature after performing the high pressure sensor, and adjust the frequency of the compressor according to the temperature after performing the high pressure sensor.
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