CN111043725A - Control method of air conditioner - Google Patents
Control method of air conditioner Download PDFInfo
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- CN111043725A CN111043725A CN201911395883.XA CN201911395883A CN111043725A CN 111043725 A CN111043725 A CN 111043725A CN 201911395883 A CN201911395883 A CN 201911395883A CN 111043725 A CN111043725 A CN 111043725A
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- 238000000034 method Methods 0.000 title claims abstract description 48
- 238000005485 electric heating Methods 0.000 claims abstract description 137
- 238000010438 heat treatment Methods 0.000 claims abstract description 45
- 238000004378 air conditioning Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 description 30
- 239000003507 refrigerant Substances 0.000 description 11
- 230000008020 evaporation Effects 0.000 description 7
- 238000001704 evaporation Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 230000002411 adverse Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2221/00—Details or features not otherwise provided for
- F24F2221/34—Heater, e.g. gas burner, electric air heater
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- Physics & Mathematics (AREA)
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- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
本发明涉及空气调节技术领域，具体涉及一种空调器的控制方法。本发明旨在解决现有的辅助电加热器的控制精度差的问题。为此目的，本发明的空调器的控制方法包括：当空调器制热运行时，检测室外环境温度；当室外环境温度小于等于预设温度时，开启第一电加热段；在第一电加热段开启后，每隔第一预设时间段，检测室外换热器的出口温度和室内机的出风温度；分别判断出口温度与第一出口温度阈值的大小和出风温度与第一出风温度阈值的大小；基于判断结果，选择性地关闭第一电加热段或开启第二电加热段。本申请的控制方法能够提高辅助电加热的控制精度，维持制热量恒定，保持制热稳定。
The invention relates to the technical field of air conditioning, in particular to a control method of an air conditioner. The present invention aims to solve the problem of poor control precision of the existing auxiliary electric heater. For this purpose, the control method of the air conditioner of the present invention includes: when the air conditioner is in heating operation, detecting the outdoor ambient temperature; when the outdoor ambient temperature is less than or equal to a preset temperature, turning on the first electric heating section; After the first preset time period is turned on, the outlet temperature of the outdoor heat exchanger and the outlet air temperature of the indoor unit are detected; The size of the temperature threshold; based on the judgment result, the first electric heating section is selectively turned off or the second electric heating section is turned on. The control method of the present application can improve the control precision of the auxiliary electric heating, keep the heating amount constant, and keep the heating stable.
Description
Technical Field
The invention relates to the technical field of air conditioning, in particular to a control method of an air conditioner.
Background
The current air conditioner has wide application, and can basically meet the refrigerating and heating requirements of users. However, under extreme weather conditions, such as a low outdoor environment temperature in winter, the evaporation pressure and the evaporation temperature of the outdoor heat exchanger are both reduced to a low level due to the low outdoor environment temperature during the heating cycle of the air conditioner, and at this time, the heat exchange effect of the outdoor heat exchanger is poor, and the heating effect of the air conditioner is obviously reduced.
To above-mentioned problem, utility model patent that publication number is CN202993410U provides a built-in no helping electric heater's outer machine of air-conditioner, and it sets up supplementary electric heater through the condenser below at the off-premises station, opens by opening of off-premises station main control board control supplementary electric heater and stops, and when outdoor ring temperature was less than the setting value and the air conditioner was opened and is heated, the automatic preheating system refrigerant that opens of supplementary electric heater to reach the evaporation temperature that improves under the working condition of heating, improve the purpose of the efficiency of heating then. Similarly, utility model patent No. CN203364511U provides an air conditioner evaporimeter with force effect of heating, and it is through embedding electric heating net in the evaporimeter body, installs the outdoor temperature probe that is used for responding to outdoor ambient temperature on the evaporimeter body, realizes that the air conditioner still can have better heating effect when low temperature heats.
Although the technical scheme solves the problem of poor heat exchange effect of the outdoor heat exchanger during low-temperature heating to a certain extent, the following problems are also inevitable: according to the technical scheme, the auxiliary electric heater can be simply controlled to be turned on or off only based on the outdoor environment temperature or the heating time, so that the heating capacity of the air conditioning system can fluctuate along with the turning on or off of the auxiliary electric heater in the actual use process, and the outlet air temperature of the indoor unit is suddenly high or low and cannot be kept constant.
Accordingly, there is a need in the art for a new control method of an air conditioner to solve the above-mentioned problems.
Disclosure of Invention
In order to solve the above-mentioned problems in the prior art, that is, to solve the problem of poor control accuracy of the conventional auxiliary electric heater, the present invention provides a control method of an air conditioner, the air conditioner includes an outdoor unit and an indoor unit, the outdoor unit includes an outdoor heat exchanger, the outdoor heat exchanger is configured with a first electric heating section and a second electric heating section, and the control method includes:
detecting the outdoor environment temperature when the air conditioner is in heating operation;
when the outdoor environment temperature is less than or equal to a preset temperature, starting the first electric heating section;
after the first electric heating section is started, detecting the outlet temperature of the outdoor heat exchanger and the outlet air temperature of the indoor unit at intervals of a first preset time period;
respectively judging the outlet temperature and a first outlet temperature threshold value and the outlet air temperature and a first outlet air temperature threshold value;
selectively turning off the first electric heating section or turning on the second electric heating section based on the determination result.
In a preferred embodiment of the above method for controlling an air conditioner, the step of selectively turning off the first electric heating section or turning on the second electric heating section based on the determination result further includes:
and when the outlet temperature is smaller than the first outlet temperature threshold value and the air outlet temperature is smaller than the first air outlet temperature threshold value, the second electric heating section is started.
In a preferred embodiment of the above method for controlling an air conditioner, the step of selectively turning off the first electric heating section or turning on the second electric heating section based on the determination result further includes:
and when the outlet temperature is greater than or equal to the first outlet temperature threshold value and/or the outlet air temperature is greater than or equal to the first outlet air temperature threshold value, closing the first electric heating section.
In a preferred embodiment of the control method of the air conditioner, after the step of "turning on the second electric heating section", the control method further includes:
detecting the outlet temperature of the outdoor heat exchanger and the outlet air temperature of the indoor unit every second preset time period;
respectively judging the outlet temperature and the first outlet temperature threshold value and the outlet air temperature and the first outlet air temperature threshold value;
selectively turning off the second electric heating section based on the judgment result.
In a preferred embodiment of the above method for controlling an air conditioner, the step of "selectively turning off the second electric heating section based on the determination result" further includes:
and when the outlet temperature is greater than or equal to the first outlet temperature threshold value and/or the outlet air temperature is greater than or equal to the first outlet air temperature threshold value, closing the second electric heating section.
In a preferred embodiment of the above method for controlling an air conditioner, the step of "selectively turning off the second electric heating section based on the determination result" further includes:
and when the outlet temperature is smaller than the first outlet temperature threshold value and the outlet air temperature is smaller than the first outlet air temperature threshold value, keeping the second electric heating section open.
In a preferred embodiment of the control method of the air conditioner, after the step of turning off the first electric heating section, the control method further includes:
detecting the outlet temperature of the outdoor heat exchanger and the outlet air temperature of the indoor unit every a third preset time period;
respectively judging the outlet temperature and a second outlet temperature threshold value and the outlet air temperature and a second outlet air temperature threshold value;
selectively turning on the first electric heating section based on the judgment result;
and the second outlet temperature threshold is smaller than the first outlet temperature threshold, and the second outlet temperature threshold is smaller than the first outlet temperature threshold.
In a preferred embodiment of the control method of an air conditioner, the step of "selectively turning on the first electric heating section based on the determination result" further includes:
and when the outlet temperature is smaller than the second outlet temperature threshold value and the air outlet temperature is smaller than the second air outlet temperature threshold value, the first electric heating section is started.
In a preferred embodiment of the control method of an air conditioner, the step of "selectively turning on the first electric heating section based on the determination result" further includes:
when the outlet temperature is smaller than the second outlet temperature threshold value and/or the outlet air temperature is smaller than the second outlet air temperature threshold value, the first electric heating section is kept closed.
In a preferred embodiment of the control method of the air conditioner, the preset temperature is set by a user.
As can be understood by those skilled in the art, in a preferred embodiment of the present invention, an air conditioner includes an outdoor unit and an indoor unit, the outdoor unit includes an outdoor heat exchanger, the outdoor heat exchanger is configured with a first electric heating section and a second electric heating section, and a control method of the air conditioner includes: detecting the outdoor environment temperature when the air conditioner is in heating operation; when the outdoor environment temperature is less than or equal to the preset temperature, starting the first electric heating section; after the first electric heating section is started, detecting the outlet temperature of the outdoor heat exchanger and the outlet air temperature of the indoor unit at intervals of a first preset time period; respectively judging the sizes of the outlet temperature and the first outlet temperature threshold value and the sizes of the outlet air temperature and the first outlet air temperature threshold value; and selectively turning off the first electric heating section or turning on the second electric heating section based on the judgment result.
The control method can improve the control precision of auxiliary electric heating, maintain the constant heating quantity and keep the heating stability by detecting the outlet temperature of the outdoor heat exchanger and the air outlet temperature of the indoor unit every other first preset time period after the first electric heating section is started and controlling the first electric heating section to be closed or the second electric heating section to be started based on the outlet temperature, the air outlet temperature and the corresponding threshold value. And, because be provided with two electrical heating sections in the off-premises station in this application, this makes this application can not appear the switch of single electrical heating section and leads to air conditioning system's heating capacity to appear undulantly, leads to the phenomenon that the air-out temperature of indoor set is suddenly high suddenly low then.
Drawings
A control method of an air conditioner of the present invention is described below with reference to the accompanying drawings. In the drawings:
fig. 1 is a system diagram of an air conditioner of the present invention;
FIG. 2 is a flowchart illustrating a control method of an air conditioner according to the present invention;
fig. 3 is a logic diagram of a control method of an air conditioner according to the present invention.
List of reference numerals
1. An outdoor unit; 11. a compressor; 12. a four-way valve; 13. an outdoor heat exchanger; 14. An outer fan; 15. an electronic expansion valve; 16. a controller; 17. an outdoor temperature sensor; 18. an outlet temperature sensor; 2. an indoor unit; 21. an indoor heat exchanger; 22. an inner fan; 23. an air outlet temperature sensor; 31. a first electrical heating section; 32. a second electrical heating section.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. For example, although the following embodiments describe each step as a sequential order, those skilled in the art can understand that, in order to achieve the effect of the present embodiments, different steps need not be executed in such an order, and they may be executed simultaneously (in parallel) or in an inverse order, and these simple variations are within the scope of the present invention.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
First, referring to fig. 1, the structure of the air conditioner of the present invention will be described. Fig. 1 is a system diagram of an air conditioner according to the present invention, in which a solid line represents a connection line and a dotted line represents a control line.
As shown in fig. 1, the air conditioner of the present application includes an outdoor unit 1 and an indoor unit 2, the outdoor unit 1 includes a compressor 11, a four-way valve 12, an outdoor heat exchanger 13, an external fan 14, an electronic expansion valve 15, and a controller 16, and the indoor unit 2 mainly includes an indoor heat exchanger 21 and an internal fan 22. The compressor 11, the four-way valve 12, the indoor heat exchanger 21, the electronic expansion valve 15 and the outdoor heat exchanger 13 are connected through pipelines to form a refrigerant cycle, and the compressor 11, the four-way valve 12, the electronic expansion valve 15, the inner fan 22 and the outer fan 14 are respectively connected with the controller 16 so that the controller 16 can control the operation of the controllers.
The outdoor heat exchanger 13 is further provided with a first electric heating section 31 and a second electric heating section 32 independent from each other, and the first electric heating section 31 and the second electric heating section 32 can directly or indirectly heat the refrigerant flowing through the outdoor heat exchanger 13. The first electric heating section 31 and the second electric heating section 32 may be both provided as electric heating tapes, the electric heating tapes are wound around the heat exchange tubes of the outdoor heat exchanger 13, and an insulating layer is further wrapped around the outer side of each electric heating tape. The first electric heating section 31 and the second electric heating section 32 are both connected to the controller 16 so that the controller 16 can control the opening and closing thereof.
The first and second electric heating tapes 31 and 32 are not limited and may be modified by those skilled in the art on the premise that direct or indirect heating of the refrigerant flowing through the outdoor heat exchanger 13 can be achieved. For example, the first electric heating belt 31 and the second electric heating belt 32 may employ an electric heating plate disposed between two heat exchange pipes of the outdoor heat exchanger 13, in addition to both the electric heating belts, and indirectly heat the refrigerant in the outdoor heat exchanger 13 when the first electric heating belt 31 and the second electric heating belt 32 are turned on. For another example, the first electric heating belt 31 and the second electric heating belt 32 may also adopt heating wires, heating rods, heating pipes, etc., and the heating belts may be directly disposed in the heat exchange pipe, and the purpose of directly heating the refrigerant in the heat exchange pipe can be achieved by placing their connection terminals outside the heat exchange pipe to connect the power supply and the controller 16.
With continued reference to fig. 1, an outdoor temperature sensor 17 for detecting an outdoor ambient temperature is further disposed in the outdoor unit 1, and the outdoor temperature sensor 17 is connected to the controller 16, so that the controller 16 can control the opening and closing of the first electric heating section 31 and the second electric heating section 32 based on the outdoor ambient temperature detected by the controller.
An outlet temperature sensor 18 for detecting the temperature of the refrigerant at the outlet of the outdoor heat exchanger 13 is further disposed at the outlet of the outdoor heat exchanger 13, and the outlet temperature sensor 18 is connected to the controller 16, so that the controller 16 can control the opening and closing of the first electric heating section 31 and the second electric heating section 32 based on the detected temperature of the refrigerant at the outlet of the outdoor heat exchanger 13.
An air outlet temperature sensor 23 capable of detecting the air outlet temperature of the indoor unit 2 is further disposed at the air outlet of the indoor unit 2, and the air outlet temperature sensor 23 is connected to the controller 16, so that the controller 16 can control the opening and closing of the first electric heating section 31 and the second electric heating section 32 based on the detected air outlet temperature of the indoor unit 2.
Next, a control method of the air conditioner of the present application will be described with reference to fig. 2. Fig. 2 is a flowchart illustrating a control method of an air conditioner according to the present invention.
As shown in fig. 2, in order to solve the problem of poor control accuracy of the conventional auxiliary electric heater, the control method of the present application mainly includes the following steps:
s100, detecting the outdoor environment temperature when the air conditioner is in heating operation; for example, after the air conditioner receives an instruction for heating operation, the temperature of the outdoor environment is detected by the outdoor temperature sensor.
S200, when the outdoor environment temperature is less than or equal to the preset temperature, starting a first electric heating section; for example, when the preset temperature is-5 ℃, and the outdoor temperature sensor detects that the outdoor ambient temperature is-10 ℃, the outdoor ambient temperature is lower, if the air conditioner is normally heated, the heat exchange effect of the outdoor heat exchanger is poor, the heating capacity is lower, the air outlet temperature of the indoor unit is lower, the heating effect is influenced, and at the moment, the controller controls the first electric heating section to be opened so as to perform auxiliary heat exchange on the outdoor heat exchanger, so that the evaporation temperature and the evaporation pressure of the outdoor heat exchanger are improved, and the heating capacity of the air conditioner is improved.
S300, detecting the outlet temperature of the outdoor heat exchanger and the outlet air temperature of the indoor unit every other first preset time period after the first electric heating section is started; for example, the first preset time period is 1min, and after the first electric heating section is started, the outlet temperature of the outdoor heat exchanger and the outlet temperature of the indoor unit are respectively detected by an outlet temperature sensor arranged at the outlet of the outdoor heat exchanger and an outlet temperature sensor arranged in the indoor unit every 1min, so as to judge the operation effect of the air conditioner after the first electric heating section is started.
S400, respectively judging the outlet temperature and the first outlet temperature threshold value and the outlet air temperature and the first outlet air temperature threshold value; for example, after the outlet temperature of the outdoor heat exchanger is detected, the outlet temperature is compared with a first outlet temperature threshold value, and after the outlet air temperature of the indoor unit is detected, the outlet air temperature is compared with the first outlet air temperature threshold value; when the outlet temperature of the outdoor heat exchanger reaches or is about to reach the first outlet temperature threshold, the heat exchange capacity of the outdoor heat exchanger reaches a better state, the evaporation temperature and the evaporation pressure of the outdoor heat exchanger are in a more ideal interval, and the threshold can be determined through tests; the first outlet air temperature threshold may be a temperature value when the outlet air temperature of the indoor unit is high, and when the outlet air temperature reaches the threshold, it is proved that the outlet air temperature of the indoor unit is high, and a user may be scalded due to the high outlet air temperature.
S500, selectively closing the first electric heating section or opening the second electric heating section based on the judgment result; for example, when the outlet temperature is greater than or equal to the first outlet temperature threshold value, it is proved that the heat exchange capacity of the outdoor heat exchanger begins to decrease at the moment, and because the air suction port of the compressor is connected behind the outdoor heat exchanger, if the outlet temperature is too high, the operation condition of the compressor is easily deteriorated, and at the moment, the first electric heating section is closed, so that the outlet temperature is maintained in a better temperature range; for another example, when the outlet air temperature is greater than the first outlet air temperature threshold, it is proved that the outlet air temperature is higher at this time, and scalding is easily caused, and the first electric heating section is closed at this time, so that the outlet air temperature is reduced to a better interval; for another example, when the outlet temperature is less than the first outlet temperature threshold and the outlet air temperature is also less than the outlet air temperature threshold, it is proved that the heat exchange capacity of the outdoor heat exchanger does not reach a better state at this time, and the indoor outlet air temperature also has an ascending space, and the second electric heating section is controlled to be opened at this time, so as to further improve the heat exchange effect and the outlet air temperature.
It can be seen from the above description that, by detecting the outlet temperature of the outdoor heat exchanger and the outlet air temperature of the indoor unit every first preset time period after the first electric heating section is turned on, and controlling the first electric heating section to be turned off or the second electric heating section to be turned on based on the outlet temperature, the outlet air temperature and the corresponding threshold value, the control method of the present application can improve the control precision of the auxiliary electric heating, maintain the heating quantity constant, and keep the heating stability. And, because be provided with two electrical heating sections in the off-premises station in this application, this makes this application need not when selecting the very high electrical heating section of power, consequently can not appear the switch of single high-power electrical heating section and lead to air conditioning system's heating capacity great fluctuation to appear, then leads to the phenomenon that the air-out temperature of indoor set is suddenly high suddenly low.
A more preferred embodiment of the control method of the air conditioner of the present application will be described with reference to fig. 3. Fig. 3 is a logic diagram of a control method of an air conditioner according to the present application.
As shown in fig. 3, in a possible implementation, step S500 further includes:
when the outlet temperature is lower than the first outlet temperature threshold and the outlet air temperature is lower than the first outlet air temperature threshold, the second electric heating section is started; otherwise, when the outlet temperature is greater than or equal to the first outlet temperature threshold and/or the outlet air temperature is greater than or equal to the first outlet air temperature threshold, the first electric heating section is closed. Wherein, the first outlet temperature threshold value can be selected from any value of 5-20 ℃, and preferably can be selected as a higher threshold value, such as 18 ℃. The first outlet air temperature threshold value can be any value of 55-60 ℃, such as 55 ℃ and the like. The first outlet temperature threshold and the first outlet air temperature threshold can be determined through experiments, and the thresholds can be adjusted within an allowable range for different types of air conditioners or different areas of use environments.
For example, taking the first preset time period as 1min, the first outlet temperature threshold value as 18 ℃ and the first outlet temperature threshold value as 55 ℃, the outlet temperature of the outdoor heat exchanger and the outlet temperature of the indoor unit are obtained every 1min, and when the outlet temperature is less than 18 ℃, it is proved that the heat exchange effect of the outdoor heat exchanger is still not optimal at this time, and the effect of only adopting the first electric heating section to heat the refrigerant in the outdoor heat exchanger is still not ideal. Similarly, when the outlet air temperature of the indoor unit is less than 55 ℃, it is proved that the outlet air temperature of the indoor unit still has a space for increasing so as to provide more comfortable outlet air temperature for users. Therefore, when the outlet temperature is lower than 18 ℃ and the outlet air temperature is lower than 55 ℃, the second electric heating section can be controlled to be opened, the electric heating power of the outdoor heat exchanger is further enhanced, the heat exchange effect of the outdoor heat exchanger is improved, and the outlet temperature and the outlet air temperature are improved.
On the contrary, when the outlet temperature is greater than or equal to 18 ℃, it is proved that the outlet temperature of the outdoor heat exchanger exceeds the temperature range with better heat exchange effect, which may bring adverse effect to the operation of the rear-end compressor, and further affect the operation stability and heat exchange effect of the air conditioner. Similarly, when the outlet air temperature of the indoor unit is greater than or equal to 55 ℃, the outlet air temperature is proved to be too high, which brings bad use experience to users, and if the outlet air temperature is continuously too high, the risk of scalding the skin is brought. At this moment, when the second judgment condition at least meets the first judgment condition, the first electric heating section is controlled to be closed so as to reduce the risk of reduction of the heat exchange effect or overhigh outlet air temperature.
With continued reference to fig. 3, in one possible embodiment, after the second electrical heating segment is activated, the control method further includes: detecting the outlet temperature of the outdoor heat exchanger and the outlet air temperature of the indoor unit every second preset time period; respectively judging the sizes of the outlet temperature and the first outlet temperature threshold value and the sizes of the outlet air temperature and the first outlet air temperature threshold value; and selectively shutting down the second electric heating section based on the judgment result. Specifically, when the outlet temperature is greater than or equal to the first outlet temperature threshold and/or the outlet air temperature is greater than or equal to the first outlet air temperature threshold, the second electric heating section is closed. And when the outlet temperature is less than the first outlet temperature threshold value and the outlet air temperature is less than the first outlet air temperature threshold value, keeping the second electric heating section open. The second preset time period may be set to be the same as the first preset time period, and is 1min, and of course, the time period may also be adjusted, for example, considering that the heating power is higher after the second electric heating period is turned on, the second preset time period may be adjusted to be a time slightly shorter than the first preset time period, for example, 30s to 50 s.
For example, taking the second preset time as 30s, the first outlet temperature threshold as 18 ℃ and the first outlet temperature threshold as 55 ℃, the outlet temperature of the outdoor heat exchanger and the outlet temperature of the indoor unit are detected every 30s, when the outlet temperature is less than 18 ℃, it is proved that the heat exchange effect of the outdoor heat exchanger is still not optimal at this time, and an ideal effect is still not achieved when the first electric heating section and the second electric heating section are adopted to heat the refrigerant in the outdoor heat exchanger. Similarly, when the outlet air temperature of the indoor unit is less than 55 ℃, it is proved that there is still room for the outlet air temperature of the indoor unit to rise so as to provide more comfortable outlet air temperature for users. Therefore, when the outlet temperature is lower than 18 ℃ and the outlet air temperature is lower than 55 ℃, the current operation state can be maintained, namely the first electric heating section and the second electric heating section are controlled to be both opened, and whether the closing condition is met is further judged when the next judgment time point comes.
On the contrary, when the outlet temperature of the outdoor heat exchanger is detected to be greater than or equal to 18 ℃, it is proved that the outlet temperature of the outdoor heat exchanger exceeds the temperature interval with better heat exchange effect, and the adverse effect may be brought to the operation of the rear-end compressor, so that the operation stability and the heat exchange effect of the air conditioner are affected. Similarly, when the outlet air temperature of the indoor unit is greater than or equal to 55 ℃, the outlet air temperature is proved to be too high, which brings bad use experience to users, and if the outlet air temperature is continuously too high, the risk of scalding the skin is brought. At the moment, when the two judgment conditions at least meet one of the two judgment conditions, the second electric heating section is controlled to be closed, and only the first electric heating section is kept to operate independently, so that the risk of reduction of the heat exchange effect or overhigh air outlet temperature is reduced, and the heat exchange effect of the outdoor heat exchanger and the air outlet temperature of the indoor unit are always kept in a reasonable interval.
With continued reference to fig. 3, in one possible embodiment, after shutting down the first electrical heating segment, the control method further includes: detecting the outlet temperature of the outdoor heat exchanger and the outlet air temperature of the indoor unit every a third preset time period; respectively judging the outlet temperature and the second outlet temperature threshold value and the outlet air temperature and the second outlet air temperature threshold value; selectively turning on the first electric heating section based on the judgment result; and the second outlet temperature threshold is smaller than the first outlet temperature threshold, and the second outlet air temperature threshold is smaller than the first outlet air temperature threshold. Specifically, when the outlet temperature is less than the second outlet temperature threshold and the outlet air temperature is less than the second outlet air temperature threshold, the first electric heating section is started. And when the outlet temperature is greater than or equal to the second outlet temperature threshold and/or the outlet air temperature is greater than or equal to the second outlet air temperature threshold, keeping the first electric heating section closed.
The third preset time period may be adjusted based on a test or an actual situation, for example, the third preset time period may be set to 20s to 40s, etc. in consideration of that the temperature of the outdoor heat exchanger is fast decreased due to a low outdoor ambient temperature after the first electric heating section is turned off. Of course, if the outdoor ambient temperature is relatively high although less than the preset temperature value, it is also contemplated to extend the third preset time period to 50s, 60s, even 70s, etc. The second outlet temperature threshold value can be a critical temperature value when the heat exchange effect of the outdoor heat exchanger is poor, and when the outlet temperature of the outdoor heat exchanger is reduced to or is about to be reduced to the second outlet temperature threshold value, the heat exchange capacity of the outdoor heat exchanger is reduced to a poor state; the second outlet air temperature threshold value can be a temperature value when the outlet air temperature of the indoor unit is lower, when the outlet air temperature is reduced to the threshold value, the outlet air temperature of the indoor unit is proved to be lower, and if the outlet air temperature is continuously reduced, the user can be provided with a cooler outlet air feeling. For example, the second outlet temperature threshold may be selected to be any value from 0 ℃ to 5 ℃, such as 3 ℃. The second outlet air temperature threshold can be selected from any value of 40-50 ℃, such as 45 ℃ and the like. The second outlet temperature threshold and the second outlet air temperature threshold can be determined through experiments, and for air conditioners of different models or use environments of different regions, the thresholds can be adjusted within an allowable range.
For example, taking the third preset time period as 30s, the second outlet temperature threshold as 3 ℃ and the second outlet temperature threshold as 45 ℃, the outlet temperature of the outdoor heat exchanger and the outlet temperature of the indoor unit are collected every 30s, and when the outlet temperature is less than 3 ℃, the heat exchange effect of the outdoor heat exchanger is poor and the overall heating capacity of the air conditioner is insufficient. Similarly, when the outlet air temperature of the indoor unit is less than 45 ℃, the outlet air temperature of the indoor unit is proved to be low, and the user can be provided with a cool outlet air feeling. Therefore, when the outlet temperature is lower than 3 ℃ and the outlet air temperature is lower than 45 ℃, the first electric heating section can be restarted to perform auxiliary heat exchange on the outdoor heat exchanger, improve the heat exchange effect of the outdoor heat exchanger, improve the outlet temperature and the outlet air temperature, and maintain the heat exchange effect of the outdoor heat exchanger and the outlet air temperature of the indoor unit to be always kept in a reasonable interval.
On the contrary, when the outlet temperature is more than or equal to 3 ℃, the outlet temperature of the outdoor heat exchanger is still in a temperature range with better heat exchange effect, and the operation stability and the heat exchange effect of the air conditioner can be still ensured although the temperature is reduced to some extent. Similarly, when the outlet air temperature of the indoor unit is greater than or equal to 45 ℃, although the outlet air temperature is reduced, the outlet air temperature is still within an acceptable range. At the moment, when the two judgment conditions at least meet one of the two judgment conditions, the first electric heating section is controlled to be kept closed so as to maintain the current running state and save energy.
In addition, in this embodiment, the preset temperature may be a temperature stored in the air conditioner at the time of factory shipment, or may be a temperature set by the user through a remote controller, a mobile phone APP, or the like, and when the user sets the preset temperature by himself, the air conditioner receives the temperature and stores it in the storage device of the air conditioner, and calls the preset temperature when the control method is executed.
Those skilled in the art will appreciate that although some embodiments described herein include some features included in other embodiments instead of others, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the claims of the present invention, any of the claimed embodiments may be used in any combination.
A possible control flow of the air conditioner of the present invention will be briefly described with reference to fig. 3.
In one possible embodiment, as shown in fig. 3, the user turns on the air conditioner and selects the heating mode → first the controllerControlling outdoor temperature sensor to detect outdoor ambient temperature ToAnd determining ToWhether the temperature is less than or equal to minus 5 ℃ or not → when the judgment result is true, the controller controls the first electric heating section to be started to heat the refrigerant in the outdoor heat exchanger; otherwise, continuously detecting the outdoor environment temperature → starting the first electric heating section, and controlling the outlet temperature sensor to detect the outlet temperature T of the outdoor heat exchanger by the controllercAnd controlling the air outlet temperature sensor to detect the air outlet temperature T of the indoor unitfAnd determining Tc< 18 ℃ and TfIf the temperature is less than 55 ℃, the second electric heating section is started under the control of the controller; otherwise, the controller controls to close the first electric heating section.
(1) After the second electric heating section is started, the outlet temperature T of the outdoor heat exchanger is respectively detected by the outdoor temperature sensor and the outlet temperature sensor againcAnd the outlet air temperature T of the indoor unitfAnd determining Tc< 18 ℃ and TfWhether or not < 55 ℃ is established at the same time → if so, the controller controls the first electric heating section and the second electric heating section to remain on at the same time, and continues to control the outlet temperature TcAnd the outlet air temperature TfMonitoring is carried out; otherwise, controlling to close the second electric heating section and returning to continuously obtain the outlet temperature TcAnd the outlet air temperature TfAnd performing a control loop.
(2) After the first electric heating section is closed, the outlet temperature T of the outdoor heat exchanger is detected by the outdoor temperature sensor and the outlet temperature sensor respectivelycAnd the outlet air temperature T of the indoor unitfAnd determining Tc< 3 ℃ and TfWhether < 45 ℃ is simultaneously established → if so, the controller controls to turn on the first electric heating section and returns to continuously obtain the outlet temperature TcAnd the outlet air temperature TfPerforming a control cycle; otherwise, the controller controls the first electric heating section to be kept closed and continues to control the outlet temperature TcAnd the outlet air temperature TfAnd (5) monitoring.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
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