CN110006133B - Air conditioner defrosting control method and device and air conditioner - Google Patents
Air conditioner defrosting control method and device and air conditioner Download PDFInfo
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- CN110006133B CN110006133B CN201910305286.7A CN201910305286A CN110006133B CN 110006133 B CN110006133 B CN 110006133B CN 201910305286 A CN201910305286 A CN 201910305286A CN 110006133 B CN110006133 B CN 110006133B
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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
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
- F24F11/42—Defrosting; Preventing freezing of outdoor units
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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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
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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Abstract
The invention provides an air conditioner defrosting control method, an air conditioner defrosting control device and an air conditioner, wherein the air conditioner defrosting control method comprises the steps of acquiring the temperature of an indoor coil and the temperature of an outdoor coil of the air conditioner in real time; calculating the temperature difference delta T according to the temperature of the indoor coil and the temperature of the outdoor coil; and defrosting when the temperature difference delta T is greater than or equal to a preset temperature difference threshold value. In the running process of the air conditioner, if the temperature difference delta T is continuously larger than or equal to the temperature difference threshold value, updating the temperature difference threshold value to the temperature difference delta T; and when the exit condition is met, controlling the air conditioner to exit defrosting. Compare through the difference with the difference threshold value of the difference of the indoor coil pipe temperature after the steady operation with outdoor coil pipe temperature, the frosting condition is judged to the accuracy, changes the frost when confirming that difference delta T is greater than or equal to predetermined difference threshold value, realizes accurate frost, has set for simultaneously and has withdrawed from the condition to guarantee that the frost layer is removed to the greatest extent, ensures the complete defrosting, avoids frequently changing the frost.
Description
Technical Field
The invention relates to the technical field of air conditioner defrosting, in particular to an air conditioner defrosting control method and device and an air conditioner.
Background
When the air conditioner works under the working condition of low temperature or high humidity, because the evaporation temperature of the air conditioner is lower than the dew point temperature of water vapor around the outdoor unit, condensed water is generated on the surface of the heat exchanger outside the air conditioner, and when the temperature of the condensed water reaches zero or below, the condensed water can frost or even freeze outside. The existing heat pump air conditioner has a defrosting function, namely defrosting is realized by switching a heating function to a refrigerating function, namely, the outer heat exchanger dissipates heat outwards to melt frost through refrigerating operation, so that the defrosting purpose is achieved.
At present, the intelligent defrosting control mode of the air conditioner mainly achieves the defrosting purpose by detecting the temperature of an inner disc/the temperature of an outer disc and defrosting time. However, in the above-mentioned defrosting control method for an air conditioner, since the temperature of the coil of the indoor unit is greatly influenced by the external temperature, the adoption of the judgment method is easy to perform wrong defrosting, and incomplete defrosting may be caused.
Disclosure of Invention
The invention solves the problems that: the problem that the existing defrosting control method is inaccurate in defrosting is solved.
In order to solve the above problems, the present invention provides an air conditioner defrosting control method, including: when the air conditioner stably operates in a heating mode, acquiring the temperature of an indoor coil and the temperature of an outdoor coil of the air conditioner in real time; calculating the temperature difference delta T according to the temperature of the indoor coil and the temperature of the outdoor coil; and when the temperature difference delta T is larger than or equal to a preset temperature difference threshold value, controlling the air conditioner to defrost. The difference value of the indoor coil temperature and the outdoor coil temperature after stable operation is compared with the set temperature difference threshold value, the frosting condition is accurately judged, and defrosting is carried out when the temperature difference delta T is confirmed to be larger than or equal to the preset temperature difference threshold value, so that accurate defrosting is realized.
Further, the air conditioner defrosting control method comprises the following steps: and when the temperature difference delta T lasts for a first preset time length and is greater than or equal to the temperature difference threshold value, updating the temperature difference threshold value to the value of the temperature difference delta T. The temperature difference threshold value is updated according to the running state of the air conditioner, the judgment condition of entering frosting can be adjusted according to the running state of the air conditioner, and accurate defrosting is achieved.
Further, the air conditioner defrosting control method further comprises the following steps: and when the temperature difference threshold value is updated to reach a set limit value delta Tmax, stopping updating the temperature difference threshold value. And a limit value is set for the temperature difference threshold value, so that the condition that the air conditioner is frosted too thickly to increase the defrosting difficulty is prevented, and the performance of the air conditioner is prevented from being influenced.
Further, the range of the temperature difference threshold value is 35-40 ℃.
Further, the method further comprises: and when the set exit condition is met, controlling the air conditioner to exit defrosting.
Further, the exit condition includes: the running time of a compressor of the air conditioner reaches above a second preset time, and the temperature of the outdoor coil pipe is higher than a first preset temperature for a third preset time; or the time length of the defrosting mode of the air conditioner reaches a fourth preset time length. By setting the exit condition for the air conditioner, the defrosting is exited when the exit condition is met, and the setting of the exit condition can ensure that the air conditioner can be completely defrosted.
Further, the air conditioner defrosting control method comprises the following steps: and if the temperature of the outdoor coil pipe is continuously lower than the first preset temperature after the defrosting mode of the air conditioner is operated for a fourth preset time, warning information is sent. And when the air conditioner does not exit defrosting when the defrosting mode operation reaches the fourth preset time, indicating the defrosting fault of the air conditioner, and sending warning information to remind a user.
Further, the stably operating the air conditioner in the heating mode includes: when the air conditioner starts heating or recovers heating after defrosting is finished, the compressor and the inner fan continuously operate for a fifth preset time; or when the air conditioner is stopped when the temperature is reached and heating is recovered, the compressor continuously operates for a sixth preset time.
The present invention also provides an air conditioner defrosting control device for performing the air conditioner defrosting control method as described above, the air conditioner defrosting control device including:
the system comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring the temperature of an indoor coil and the temperature of an outdoor coil of an air conditioner in real time after the air conditioner stably operates in a heating mode;
the processing unit is used for calculating a temperature difference delta T according to the temperature of the indoor coil pipe and the temperature of the outdoor coil pipe;
and the control unit is used for controlling the air conditioner to defrost when the temperature difference delta T is greater than or equal to a preset temperature difference threshold value.
The invention also provides an air conditioner which comprises a controller, wherein the controller executes computer instructions to realize the defrosting control method of the air conditioner.
Drawings
FIG. 1 is a schematic view of an air conditioner provided by the present invention;
FIG. 2 is a flow chart of a defrosting control method for an air conditioner according to the present invention;
FIG. 3 is a diagram showing the variation trend of the suction and discharge pressures during the heating operation and defrosting process of the air conditioner;
fig. 4 is a schematic diagram of functional units of the defrosting control device of the air conditioner provided by the invention.
Description of reference numerals:
100-an air conditioner; 110-a controller; 200-air conditioner defrosting control device; 210-an obtaining unit; 220-a processing unit; 230-control unit.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The embodiment of the invention provides an air conditioner 100 which is used for adjusting indoor temperature and simultaneously performing accurate defrosting, avoiding frequent defrosting, and preventing incomplete defrosting and the like. Fig. 1 is a schematic diagram of an air conditioner 100 according to an embodiment of the present invention. The air conditioner 100 includes a controller 110, and the controller 110 can execute computer instructions to implement the air conditioner defrosting control method provided by the present invention. The air conditioner defrosting control device includes at least one software functional module which can be stored in the controller 110 in the form of software or firmware, for example, the software functional module can be directly burned in a storage space of the controller 110, and in another embodiment, the software functional module can also be stored in another independent storage medium and executed by the controller 110.
The controller 110 may be an integrated circuit chip having signal processing capabilities. The controller 110 may be a general-purpose processor, and may include a Central Processing Unit (CPU), a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, and a discrete hardware component, which may implement or execute the methods, steps, and logic blocks disclosed in the embodiments of the present invention. A general purpose processor may be a microprocessor. The controller 110 may also be any conventional processor or the like.
It will be appreciated that the configuration shown in fig. 1 is merely illustrative and that the air conditioner 100 may include more or fewer components than shown in fig. 1 or may have a different configuration than shown in fig. 1. The components shown in fig. 1 may be implemented in hardware, software, or a combination thereof.
Referring to fig. 2, fig. 2 shows a defrosting control method for an air conditioner according to the present embodiment. The defrosting control method of the air conditioner provided by the embodiment comprises S1-S6.
And S1, when the air conditioner operates stably in the heating mode, acquiring the temperature of the indoor coil and the temperature of the outdoor coil of the air conditioner in real time.
In winter or seasons with low outside environment temperature or high humidity, the air conditioner has the evaporation temperature lower than the dew point temperature of the water vapor around the outdoor unit, so that condensed water is generated on the surface of the heat exchanger outside the air conditioner, and when the temperature of the condensed water reaches zero or below, the condensed water can frost or even freeze on the outside. In order to monitor the frosting condition of the outdoor unit of the air conditioner in real time, the temperature of the indoor coil pipe and the temperature of the outdoor coil pipe of the air conditioner are obtained in real time after the air conditioner stably operates in a heating mode.
The stable operation of the air conditioner in the heating mode refers to that: when the air conditioner starts heating or the defrosting ends to recover heating, the compressor and the inner fan continuously operate for a fifth preset time period, for example, the fifth preset time period may be 10 minutes.
Or when the air conditioner is stopped after reaching the temperature and heating is recovered (the air conditioning unit stops operating and heating after operating to the set temperature, and heating operation is recovered when the indoor temperature is reduced and the starting condition is met), the compressor continuously operates for a sixth preset time, for example, the sixth preset time may be 4 minutes to 6 minutes.
Because the operating conditions such as compressor, indoor fan are unstable in the early stage of the air conditioner preliminary start heating, and the influence on the indoor coil temperature and the outdoor coil temperature is great, consequently, just acquire indoor coil temperature and outdoor coil temperature after the air conditioner steady operation.
In this embodiment, air conditioner internal unit, the outer machine of air conditioner all are provided with temperature sensor, and after the air conditioner mode steady operation of heating, temperature sensor acquires indoor coil pipe temperature and outdoor coil pipe temperature in real time to send the indoor coil pipe temperature and the outdoor coil pipe temperature who acquire to the controller so that handle.
And S2, calculating the temperature difference delta T according to the indoor coil temperature and the outdoor coil temperature.
It can be understood that when the air conditioner works in the heating mode, the temperature of the indoor coil is higher than that of the outdoor coil, the temperature of the indoor coil is measured to be Tem, and the temperature of the outdoor coil is measured to be Tdef, so that the temperature difference delta T satisfies the following formula: Δ T ═ Tem-Tdef. For example, when the air conditioning unit is stably operated under the standard heating condition (the indoor dry bulb temperature is 20 ℃, the indoor wet bulb temperature is 15 ℃, the outdoor dry bulb temperature is 7 ℃, and the outdoor wet bulb temperature is 6 ℃), the acquired indoor coil temperature Tem is 35 ℃ and the outdoor coil temperature Tdef is 3.0, and the temperature difference Δ T-Tem-Tdef can be calculated to be 32 ℃ according to the acquired indoor coil temperature and the outdoor coil temperature.
And S3, determining whether the calculated temperature difference Delta T is greater than or equal to a set temperature difference threshold value.
In this embodiment, a temperature difference threshold is preset, where the temperature difference threshold is a maximum value of a difference between the indoor coil temperature and the outdoor coil temperature, and it can be understood that, after the air conditioner operates stably, the indoor temperature is in a stable range, and the fluctuation is small, that is, the indoor coil temperature Tem is in a stable range, after the air conditioner operates stably, the change of the temperature difference Δ T is mainly determined by the change trend of the outdoor coil temperature Tdef, and when the fluctuation of the indoor coil temperature Tem is small, the outdoor coil temperature decreases, and the temperature difference Δ T increases; if the temperature of the outdoor coil rises, the temperature difference Delta T is reduced.
Understandably, outdoor coil pipe temperature receives outdoor ambient temperature's influence, and the fluctuation is great relatively, and when air conditioner off-premises station frosted, outdoor coil pipe temperature can sharply reduce, along with the worsening of the degree of frosting, outdoor coil pipe temperature decline speed was faster and faster, when frosting was thick, the heating performance of air conditioner reduced, influences user's experience, consequently, need worsen before the defrosting, avoided influencing the performance of air conditioner.
The temperature difference threshold is a maximum value of a difference value between the set indoor coil temperature and the set outdoor coil temperature to represent the frosting condition of the air conditioner, and the temperature difference threshold is set according to the performance of the air conditioner, for example, the preset temperature difference threshold is 35 ℃. When the temperature difference delta T is larger than or equal to the temperature difference threshold value, the temperature of the outdoor coil pipe is reduced to a lower level, the frosting degree is thicker, and defrosting is needed, and when the temperature difference delta T is smaller than the temperature difference threshold value, the frosting degree of the outdoor unit of the outdoor air conditioner is lighter or not frosted, and defrosting is not needed. For example, when the air conditioner set operates in an environment with easy frosting (such as an indoor dry bulb temperature of 20 ℃, an indoor wet bulb temperature of 15 ℃, an outdoor dry bulb temperature of 2 ℃ and an outdoor wet bulb temperature of 1 ℃), the indoor coil temperature Tem is 34.2 ℃, the outdoor coil temperature Tdef is-3.0, the temperature difference Δ T is 37.2 ℃, and the temperature difference Δ T is greater than a preset temperature difference threshold, which indicates that the outdoor unit of the air conditioner starts to frost periodically.
For easy understanding, please refer to fig. 3, fig. 3 shows a trend chart of the suction and discharge pressure during the heating operation and the defrosting process of the air conditioner. The upper curve in the figure is the suction pressure curve and the lower curve is the discharge pressure curve. The suction pressure can approximately represent the variation trend of the temperature of the indoor coil, and the exhaust pressure can approximately represent the variation trend of the temperature of the outdoor coil. When the air conditioner works in a heating mode, after the air conditioner normally runs and heats to a set temperature, the temperature of the indoor coil and the temperature of the outdoor coil can be kept stable within a certain time, namely Tem and Tdef are basically kept unchanged, but when the outdoor unit starts to frost, the temperature of the indoor coil and the temperature of the outdoor coil are reduced according to different degrees, a maximum difference value namely delta Tmax exists between the indoor coil and the outdoor coil when the outdoor unit frosts to a certain degree, and the delta Tmax can correspond to different ranges according to the frosting thickness delta Tmax, so the parameter can be used as a defrosting entry condition, and in the embodiment, the range of the delta Tmax is set to be 35-40 ℃. However, the present invention is not limited to this, and the setting may be adapted according to the heating performance and the use environment of the air conditioner.
If the temperature difference Δ T is greater than or equal to the set temperature difference threshold, defrosting is performed, and S4 is executed. And if the temperature difference delta T is lower than the set temperature difference threshold value, continuously detecting.
And S4, controlling the air conditioner to defrost.
The air conditioner has two defrosting modes, one is stopping defrosting to enable a frost layer to melt by itself, the mode is not feasible at a low temperature and has a long defrosting time, and the other is heating defrosting, namely, the working mode of the air conditioner is changed, and a compressor is used for heating to achieve the defrosting effect.
In this embodiment, while controlling the air conditioner to defrost, the air conditioner defrost control method further includes the step of updating the temperature difference threshold.
S41: and when the temperature difference delta T lasts for the first preset time length and is greater than or equal to the temperature difference threshold value, updating the temperature difference threshold value to be the value of the temperature difference delta T.
And if the calculated temperature difference delta T lasts for the first preset time length and is greater than or equal to the temperature difference threshold value, updating the temperature difference threshold value to be the value of the temperature difference delta T. It can be understood that if the calculated temperature difference Δ T lasts for the first preset time period and is greater than or equal to the temperature difference threshold, it is indicated that the frosting degree represented by the temperature difference threshold is relatively light, at this time, defrosting is performed, frequent defrosting may be caused, and therefore, the value of the temperature difference threshold is updated to the value of the temperature difference Δ T, after the defrosting is completed, when the next frosting starts, the defrosting time can be properly delayed, the defrosting frequency is reduced, and accurate defrosting is achieved.
The first preset time period may be set to 10 seconds, but is not limited thereto, and may also be other time periods, such as 8 to 15 seconds, and the like.
In this embodiment, the temperature difference threshold is set to be 35-40 ℃, the initial value of the temperature difference threshold is set to be 35 ℃, when the temperature difference threshold is updated to reach the set limit Δ Tmax, the limit Δ Tmax represents a critical value of the frosting degree of the air conditioner, for example, 40 ℃, when the temperature difference Δ T reaches 40 ℃, it indicates that the frosting of the air conditioner is serious, and the defrosting must be performed immediately.
After the air conditioner runs in a defrosting mode or a defrosting mode, the temperature of the indoor coil and the temperature of the outdoor coil are continuously detected, and whether a set exit condition is met or not is determined.
And S5, when the set exit condition is met, controlling the air conditioner to exit defrosting.
In this embodiment, two exit conditions are set, and when the air conditioner operating in the defrosting mode or the defrosting mode satisfies any one of the exit conditions, the defrosting is exited.
The exit conditions include:
the running time of the compressor of the air conditioner reaches above the second preset time, and the temperature of the outdoor coil pipe is higher than the first preset temperature when the outdoor coil pipe continues to have the third preset time.
The running time of the compressor reaches a second preset time to ensure that defrosting is completed, the second preset time can be set to be 1 minute, but the defrosting time is not limited to the second preset time, the defrosting time can also be longer, the air conditioner heats to defrost when the running time of the compressor exceeds the second preset time, understandably, the frost layer is reduced, the temperature of the outdoor coil pipe is increased, and when the temperature of the outdoor coil pipe is continuously higher than the first preset temperature for a third preset time, the air conditioner can be confirmed, and defrosting of the frost layer is completed. The third preset time can be set to be 3-5 seconds, the first preset temperature can be set to be 12 ℃, but the method is not limited to this, and adaptive adjustment can also be carried out according to the working environment of the air conditioner.
The exit condition further includes: and the defrosting mode operation time of the air conditioner reaches a fourth preset time. It can be understood that, for the air conditioner, the defrosting efficiency of the defrosting mode is determined, in this embodiment, a fourth preset time period is set, the fourth preset time period includes a certain time redundancy to ensure complete defrosting, and when the defrosting mode operation of the air conditioner reaches the fourth preset time period, the defrosting mode is exited. The fourth preset time period may be set according to the defrosting efficiency of the air conditioner, for example, the fourth preset time period may be a preset time period required for starting the defrosting mode to completely defrost after the air conditioner frosts to a certain thickness, plus a time redundancy of a certain length. Therefore, it can be ensured that the air conditioner can completely defrost after the defrosting mode operates for the fourth preset time period in a general condition, in this embodiment, the fourth preset time period may be set to 12 minutes, but is not limited thereto, and may also be set and adjusted according to the performance and the working environment of the air conditioner.
And S6, if the outdoor coil temperature is continuously lower than the first preset temperature after the defrosting mode of the air conditioner is operated for a fourth preset time, warning information is sent.
It will be appreciated that, in general, when the air conditioner is operated in the defrost mode for a fourth predetermined period of time, the air conditioner is fully defrosted and the outdoor coil temperature rises to a normal level, for example, above a first predetermined temperature, which may be set at 12 ℃.
If the outdoor coil temperature is continuously lower than the first preset temperature after the defrosting mode of the air conditioner is operated for the fourth preset time, it is indicated that the defrosting mode of the air conditioner does not achieve the due defrosting effect, the defrosting function of the air conditioner fails or the frosting degree of the air conditioner is seriously deteriorated, the due defrosting effect is not achieved, and at the moment, the air conditioner generates and sends out warning information.
For example, the air conditioner includes a display or a display panel, and the display or the display panel may be controlled to display the warning information, in other embodiments of this embodiment, the air conditioner may further send the warning information to an intelligent terminal (e.g., a smart phone) of a user through the server to display, so as to remind the user to verify an operation state of the air conditioner, and avoid damage to the air conditioner.
In order to execute the corresponding steps in the above embodiments and various possible implementations, an implementation of the air conditioner defrosting control device 200 is given below, please refer to fig. 4, and fig. 4 is a diagram of the air conditioner defrosting control device 200 according to the preferred embodiment of the present invention. It should be noted that the basic principle and the technical effects of the air conditioner defrosting control device 200 provided in the present embodiment are substantially the same as those of the air conditioner defrosting control method provided in the above embodiment, and for the sake of brief description, no mention is made in this embodiment, and reference may be made to the corresponding contents in the above embodiment.
The air conditioner defrosting control device 200 includes: an acquisition unit 210, a processing unit 220 and a control unit 230.
The obtaining unit 210 is configured to obtain the temperature of the indoor coil and the temperature of the outdoor coil of the air conditioner 100 in real time after the air conditioner 100 stably operates in the heating mode. In this embodiment, the air conditioner internal unit and the air conditioner external unit are both provided with temperature sensors, and after the air conditioner 100 stably operates in the heating mode, the temperature sensors acquire the indoor coil temperature and the outdoor coil temperature in real time, and send the acquired indoor coil temperature and the acquired outdoor coil temperature to the controller 110 for processing.
It is to be understood that in a preferred embodiment, the obtaining unit 210 may be configured to execute S1.
And the processing unit is used for calculating the temperature difference delta T according to the temperature of the indoor coil and the temperature of the outdoor coil. When the air conditioner 100 operates in the heating mode, it can be understood that the indoor coil temperature is higher than the outdoor coil temperature, the indoor coil temperature is measured to be Tem, and the outdoor coil temperature is measured to be Tdef, and then the temperature difference Δ T satisfies the following equation: and the delta T is Tem-Tdef, and the temperature difference delta T can be calculated according to the indoor coil temperature and the outdoor coil temperature.
A temperature difference threshold is preset in this embodiment, and is a maximum value of a difference between the indoor coil temperature and the outdoor coil temperature to represent a frosting condition of the air conditioner 100, and it can be understood that, after the air conditioner 100 operates stably, the indoor temperature is in a stable range and fluctuates little, that is, the indoor coil temperature Tem is in a stable range, after the air conditioner 100 operates stably, a change of the temperature difference Δ T is mainly determined by a change trend of the outdoor coil temperature Tdef, and under a condition that the fluctuation of the indoor coil temperature Tem is small, the temperature difference Δ T is increased when the outdoor coil temperature decreases; if the temperature of the outdoor coil rises, the temperature difference Delta T is reduced.
And if the temperature difference delta T is larger than or equal to the set temperature difference threshold value, defrosting is carried out. And if the temperature difference delta T is lower than the set temperature difference threshold value, continuously detecting.
It is to be appreciated that in a preferred embodiment, the processing element can be configured to perform S2-S3.
And the control unit is used for controlling the air conditioner 100 to defrost when the temperature difference delta T is greater than or equal to a preset temperature difference threshold value.
When the temperature difference Δ T is greater than or equal to the preset temperature difference threshold, the air conditioner 100 meets the defrosting condition, and at this time, the air conditioner 100 is controlled to start the defrosting mode or the defrosting mode to defrost.
It will be appreciated that in a preferred embodiment, the control unit may be adapted to perform S4.
It should be noted that, if the calculated temperature difference Δ T lasts for the first preset time period and is greater than or equal to the temperature difference threshold, the processing unit is further configured to update the temperature difference threshold to the value of the temperature difference Δ T. It can be understood that if the calculated temperature difference Δ T lasts for the first preset time period and is greater than or equal to the temperature difference threshold, it is indicated that the frosting degree represented by the temperature difference threshold is relatively light, at this time, defrosting is performed, frequent defrosting may be caused, and therefore, the value of the temperature difference threshold is updated to the value of the temperature difference Δ T, after the defrosting is completed, when the next frosting starts, the defrosting time can be properly delayed, the defrosting frequency is reduced, and accurate defrosting is achieved.
It will be appreciated that in a preferred embodiment, the processing unit is further configured to perform S41.
The control unit is also used to control the air conditioner 100 to exit defrosting when the air conditioner 100 meets an exit condition. And when the air conditioner 100 meets the set exit condition, controlling the air conditioner 100 to exit defrosting. In the present embodiment, two exit conditions are set, and when the air conditioner 100 operating in the defrosting mode or the defrosting mode satisfies any one of the exit conditions, the defrosting is exited. The exit conditions include: the running time of the compressor of the air conditioner 100 reaches more than the second preset time, and the temperature of the outdoor coil pipe is continuously higher than the first preset temperature for the third preset time; alternatively, the air conditioner 100 operates the defrost mode for a fourth preset period of time.
It will be appreciated that in a preferred embodiment, the control unit is also arranged to perform S5.
The control unit is further configured to send warning information when the outdoor coil temperature is continuously lower than the first preset temperature after the air conditioner 100 operates in the defrosting mode for a fourth preset duration. It is understood that, in general, when the air conditioner 100 is operated in the defrosting mode for the fourth preset time period, the air conditioner 100 can be completely defrosted, and the outdoor coil temperature rises to a normal level, for example, to reach above the first preset temperature, which may be set to 12 ℃. If the outdoor coil temperature is continuously lower than the first preset temperature after the defrosting mode of the air conditioner 100 is operated for the fourth preset time, it indicates that the defrosting mode of the air conditioner 100 does not achieve the due defrosting effect, the defrosting function of the air conditioner 100 fails or the frosting degree of the air conditioner 100 is seriously deteriorated, and the due defrosting effect is not achieved, at this time, the air conditioner 100 generates and sends out warning information.
It will be appreciated that in a preferred embodiment, the control unit is also arranged to perform S6.
In summary, the present invention provides an air conditioner defrosting control method, an air conditioner defrosting control device and an air conditioner, wherein the air conditioner defrosting control method includes acquiring the temperature of an indoor coil and the temperature of an outdoor coil of the air conditioner in real time after the air conditioner stably operates in a heating mode; calculating the temperature difference delta T according to the temperature of the indoor coil and the temperature of the outdoor coil; and when the temperature difference delta T is larger than or equal to a preset temperature difference threshold value, controlling the air conditioner to defrost. And in the running process of the air conditioner, if the temperature difference Delta T lasts for the first preset time length and is greater than or equal to the temperature difference threshold, updating the temperature difference threshold to be the value of the temperature difference Delta T. And when the set exit condition is met, controlling the air conditioner to exit defrosting. Compare through the difference with the difference threshold value of the difference of the indoor coil pipe temperature after the steady operation with outdoor coil pipe temperature, the frosting condition is judged to the accuracy, changes the frost when confirming that difference delta T is greater than or equal to predetermined difference threshold value, realizes accurate frost, has set for simultaneously and has withdrawed from the condition to guarantee that the frost layer is removed to the greatest extent, ensures the complete defrosting, avoids frequently changing the frost.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, the functional modules in the embodiments of the present invention may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. An air conditioner defrosting control method is characterized by comprising the following steps:
when the air conditioner (100) stably operates in a heating mode, acquiring the temperature of an indoor coil and the temperature of an outdoor coil of the air conditioner (100) in real time;
calculating the temperature difference delta T according to the temperature of the indoor coil and the temperature of the outdoor coil;
when the temperature difference delta T is larger than or equal to a preset temperature difference threshold value, controlling the air conditioner (100) to defrost;
and when the temperature difference delta T lasts for a first preset time length and is greater than or equal to the temperature difference threshold value, updating the temperature difference threshold value to the value of the temperature difference delta T.
2. The air conditioner defrost control method of claim 1, further comprising:
and when the temperature difference threshold value is updated to reach a set limit value delta Tmax, stopping updating the temperature difference threshold value.
3. The air conditioner defrosting control method according to claim 2, wherein the temperature difference threshold Δ T is in a range of 35 to 40 ℃.
4. The air conditioner defrost control method of claim 1, further comprising:
and when the set exit condition is met, controlling the air conditioner (100) to exit defrosting.
5. The air conditioner defrost control method of claim 4, wherein the exit condition comprises:
the running time of a compressor of the air conditioner (100) reaches above a second preset time, and the temperature of the outdoor coil pipe is higher than a first preset temperature for a third preset time;
or the defrosting mode operation time of the air conditioner (100) reaches a fourth preset time.
6. The air conditioner defrost control method of claim 1, comprising:
and if the temperature of the outdoor coil pipe is continuously lower than the first preset temperature after the defrosting mode of the air conditioner (100) reaches a fourth preset time, warning information is sent.
7. The air conditioner defrost control method of claim 1, wherein said stably operating the air conditioner (100) in the heating mode comprises:
when the air conditioner (100) starts heating or recovers heating after defrosting is finished, the compressor and the inner fan continuously operate for a fifth preset time;
or when the air conditioner (100) recovers to heat after reaching the temperature and stopping, the compressor continuously operates for a sixth preset time.
8. An air conditioner defrost control apparatus, characterized in that the air conditioner defrost control apparatus (200) is configured to perform the air conditioner defrost control method according to any of claims 1-7, the air conditioner defrost control apparatus (200) comprising:
the system comprises an acquisition unit (210) and a control unit, wherein the acquisition unit is used for acquiring the temperature of an indoor coil and the temperature of an outdoor coil of the air conditioner (100) in real time after the air conditioner (100) stably operates in a heating mode;
the processing unit (220) is used for calculating a temperature difference delta T according to the indoor coil temperature and the outdoor coil temperature;
a control unit (230) for controlling the air conditioner (100) to defrost when the temperature difference Δ T is greater than or equal to a preset temperature difference threshold;
the processing unit (220) is further configured to update the temperature difference threshold to a value of the temperature difference Δ T when the temperature difference Δ T lasts for a first preset duration greater than or equal to the temperature difference threshold.
9. An air conditioner, characterized in that the air conditioner (100) comprises a controller (110), and the controller (110) executes computer instructions to realize the defrosting control method of the air conditioner according to any one of claims 1 to 7.
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| CN110686356A (en) * | 2019-09-23 | 2020-01-14 | 珠海格力电器股份有限公司 | Control method for preventing frequent shutdown of air conditioner, computer readable storage medium and air conditioner |
| CN111425990B (en) * | 2020-03-04 | 2023-02-24 | 青岛海尔空调电子有限公司 | Defrosting control method of multi-split air conditioning system |
| CN113074440B (en) * | 2021-05-08 | 2022-04-19 | 宁波奥克斯电气股份有限公司 | Defrosting control method and device and air conditioner |
| CN113587368B (en) * | 2021-07-21 | 2022-12-20 | 珠海格力电器股份有限公司 | Cleaning method, device and equipment of air conditioner and storage medium |
| CN114151927B (en) * | 2021-11-26 | 2023-02-10 | 宁波奥克斯电气股份有限公司 | Anti-frosting control method and device and air conditioner |
| CN114322224A (en) * | 2021-12-27 | 2022-04-12 | 海信（山东）空调有限公司 | Air conditioner defrosting control method and device, air conditioner and storage medium |
| CN114719398A (en) * | 2022-04-01 | 2022-07-08 | 北京小米移动软件有限公司 | Defrosting device, heating apparatus, automatic defrosting control method, and storage medium |
| CN116907140A (en) * | 2023-07-28 | 2023-10-20 | 北京工业大学 | Heat pump defrosting starting control method based on automatic temperature difference adjustment of outdoor temperature |
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