WO2024001373A1

WO2024001373A1 - Air conditioner and defrosting control method therefor

Info

Publication number: WO2024001373A1
Application number: PCT/CN2023/085882
Authority: WO
Inventors: 张素珍; 王军
Original assignee: 海信空调有限公司
Priority date: 2022-06-30
Filing date: 2023-04-03
Publication date: 2024-01-04

Abstract

An air conditioner (1000) and a defrosting control method therefor. The air conditioner (1000) comprises an indoor unit (10), an outdoor unit (20), and a controller (40), wherein the outdoor unit (20) comprises a compressor (201), an outdoor heat exchanger (202), and a first temperature sensor (207), and the controller (40) is configured to: when the air conditioner (1000) is in a heating mode, acquire operation parameters of the air conditioner (1000); according to the operation parameters, control the air conditioner (1000) to enter a false defrosting mode; determine a first frequency, an initial temperature difference and a second frequency; and control, according to the first frequency, the initial temperature difference and the second frequency, the air conditioner (1000) to operate for a preset duration in the false defrosting mode, and after the duration during which the air conditioner (1000) operates in the false defrosting mode exceeds the preset duration, control the air conditioner (1000) to exit the false defrosting mode.

Description

Air conditioner and defrost control method thereof

This application claims the priority of the Chinese patent application with application number 202210763502.4 submitted on June 30, 2022; the priority of the Chinese patent application with application number 202210760685.4 submitted on June 30, 2022, and its entire content is approved by This reference is incorporated into this application.

Technical field

The present disclosure relates to the technical field of air conditioning, and in particular to an air conditioner and a defrost control method thereof.

Background technique

With the advancement of science and technology and the improvement of people's living standards, air conditioners have become a commonly used item in people's work and life. In winter, when the outdoor temperature is low, the air conditioner can run in heating mode to heat the room. Moreover, due to the low outdoor temperature in winter, frost may form on the outside of the air conditioner after the air conditioner is operated in the heating mode for a long time.

Contents of the invention

On the one hand, an air conditioner is provided. The air conditioner includes an indoor unit, an outdoor unit and a controller. The outdoor unit includes a compressor, an outdoor heat exchanger and a first temperature sensor. The first temperature sensor is disposed on the outdoor heat exchanger and configured to detect outdoor ambient temperature. The controller is configured to: when the air conditioner is in the heating mode, obtain the operating parameters of the air conditioner; control the air conditioner to enter the false defrost mode according to the operating parameters, and determine that the air conditioner enters the false defrost mode. The operating frequency of the compressor in the false defrost mode is the first frequency, and the outdoor temperature difference when the air conditioner enters the false defrost mode is the initial temperature difference, and the air conditioner is controlled to continue heating instead of For defrosting, the outdoor temperature difference is the difference between the outdoor ambient temperature and the temperature of the coil in the outdoor heat exchanger; if it is determined that the operating frequency of the compressor remains unchanged for at least two consecutive preset periods, Determine the operating frequency of the compressor at the current moment as the second frequency; control the air conditioner to operate in the false defrost mode according to the first frequency, the initial temperature difference and the second frequency. duration, and after the duration of the air conditioner operating in the pseudo defrost mode exceeds the preset duration, the air conditioner is controlled to exit the pseudo defrost mode.

On the other hand, a defrost control method for an air conditioner is provided. The defrosting method is applied to the controller of the air conditioner. The air conditioner includes an indoor unit and an outdoor unit. The outdoor unit includes a compressor, an outdoor heat exchanger and a first temperature sensor. The first temperature sensor is disposed on the outdoor heat exchanger and configured to detect outdoor ambient temperature. The method includes: obtaining the operating parameters of the air conditioner when the air conditioner is in the heating mode; controlling the air conditioner to enter the false defrost mode according to the operating parameters; and determining that the air conditioner enters the false defrost mode. The operating frequency of the compressor in defrost mode is the first frequency, and the outdoor temperature difference when the air conditioner enters the false defrost mode is the initial temperature difference, and the air conditioner is controlled to continue heating instead of defrosting, The outdoor temperature difference is the difference between the outdoor ambient temperature and the temperature of the coil in the outdoor heat exchanger; if it is determined that the operating frequency of the compressor remains unchanged for at least two consecutive preset periods, determine the current time The operating frequency of the compressor is the second frequency; according to the first frequency, the initial temperature difference and the second frequency, the air conditioner is controlled to run in the false defrost mode for a preset time, and After the air conditioner operates in the false defrost mode for more than the preset time period, the air conditioner is controlled to exit the false defrost mode.

Description of drawings

In order to explain the technical solutions in the present disclosure more clearly, the drawings required to be used in some embodiments of the present disclosure will be briefly introduced below. However, the drawings in the following description are only the drawings of some embodiments of the present disclosure. , for those of ordinary skill in the art, other drawings can also be obtained based on these drawings. In addition, the drawings in the following description can be regarded as schematic diagrams and are not intended to limit the actual size of the product, the actual flow of the method, the actual timing of the signals, etc. involved in the embodiments of the present disclosure.

Figure 1 is a structural diagram of an air conditioner according to some embodiments;

Figure 2 is another structural diagram of an air conditioner according to some embodiments;

Figure 3 is a block diagram of an air conditioner according to some embodiments;

Figure 4 is a flow chart of steps performed by a controller in an air conditioner according to some embodiments;

Figure 5 is a schematic diagram illustrating the corresponding relationship between the operating frequency of the compressor and the third temperature according to some embodiments;

Figure 6 is another flowchart of steps performed by a controller in an air conditioner according to some embodiments;

Figure 7 is yet another flowchart of steps performed by a controller in an air conditioner according to some embodiments;

Figure 8 is yet another flowchart of steps performed by a controller in an air conditioner according to some embodiments;

Figure 9 is yet another flowchart of steps performed by a controller in an air conditioner according to some embodiments;

Figure 10 is yet another flowchart of steps performed by a controller in an air conditioner according to some embodiments;

Figure 11 is yet another flowchart of steps performed by a controller in an air conditioner according to some embodiments;

Figure 12 is yet another flowchart of steps performed by a controller in an air conditioner according to some embodiments;

Figure 13 is another flowchart of steps performed by a controller in an air conditioner according to some embodiments;

Figure 14 is yet another flowchart of steps performed by a controller in an air conditioner according to some embodiments.

Detailed ways

Some embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments provided by this disclosure, all other embodiments obtained by those of ordinary skill in the art fall within the scope of protection of this disclosure.

Unless the context otherwise requires, throughout the specification and claims, the term "comprise" and its other forms such as the third person singular "comprises" and the present participle "comprising" are used. Interpreted as open and inclusive, it means "including, but not limited to." In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "example", "specific "example" or "some examples" and the like are intended to indicate that a particular feature, structure, material or characteristic associated with the embodiment or example is included in at least one embodiment or example of the present disclosure. The schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be included in any suitable manner in any one or more embodiments or examples.

Hereinafter, the terms “first” and “second” are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Therefore, features defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the embodiments of the present disclosure, unless otherwise specified, "plurality" means two or more.

In describing some embodiments, expressions "coupled" and "connected" and their derivatives may be used. The term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integrated connection; it can be a direct connection or an indirect connection through an intermediate medium. The term "coupled" indicates that two or more components are in direct physical or electrical contact. The term "coupled" or "communicatively coupled" may also refer to two or more components that are not in direct contact with each other but still cooperate or interact with each other. The embodiments disclosed herein are not necessarily limited by the content herein.

"A and/or B" includes the following three combinations: A only, B only, and a combination of A and B.

As used herein, the term "if" is optionally interpreted to mean "when" or "in response to" or "in response to determining" or "in response to detecting," depending on the context. Similarly, depending on the context, the phrase "if it is determined..." or "if [stated condition or event] is detected" is optionally interpreted to mean "when it is determined..." or "in response to the determination..." or “on detection of [stated condition or event]” or “in response to detection of [stated condition or event].”

The use of "suitable for" or "configured to" in this document implies open and inclusive language that does not exclude devices that are suitable for or configured to perform additional tasks or steps.

As used herein, "about," "approximately," or "approximately" includes the stated value as well as an average within an acceptable range of deviations from the particular value, as determined by one of ordinary skill in the art. Determined taking into account the measurement in question and the errors associated with the measurement of the specific quantity (i.e., the limitations of the measurement system).

As used herein, "parallel," "perpendicular," and "equal" include the stated situation as well as situations that are approximate to the stated situation within an acceptable deviation range, where Such acceptable deviation ranges are as determined by one of ordinary skill in the art taking into account the measurement in question and the errors associated with the measurement of the particular quantity (ie, the limitations of the measurement system).

After the outdoor unit of the air conditioner is frosted, the frost layer will increase the thermal resistance of the outdoor unit, causing the outdoor air circulation area to decrease and the flow resistance to increase, resulting in a decrease in the air volume of the outdoor unit, which in turn leads to a loss of heat exchange in the outdoor unit. The effect becomes worse. Therefore, after the air conditioner has been running for a period of time, it needs to be defrosted.

The current defrosting methods mainly include reverse cycle defrost, hot gas bypass defrost and phase change energy storage defrost. When the air conditioner uses the reverse cycle defrosting method, the indoor heat exchanger acts as an evaporator, which will cause the indoor ambient temperature to drop and affect the heating effect of the air conditioner. When the air conditioner adopts the hot gas bypass defrosting method, by setting up a bypass loop at the exhaust port of the compressor, the high-temperature gaseous refrigerant discharged from the compressor can be directed to the outdoor heat exchanger to achieve defrosting. However, the hot gas bypass defrost method requires a longer time, usually more than twice the reverse cycle defrost time. The phase change energy storage defrost method refers to storing part of the heat through the heat accumulator in heating mode and releasing the heat for defrosting during defrosting. However, phase change energy storage defrost will affect the heat dissipation of the compressor, easily causing the compressor exhaust temperature to be too high, and the energy storage of the heat accumulator is limited.

Generally, the difference between the outdoor ambient temperature and the coil temperature in the outdoor heat exchanger can be used to determine whether to defrost the air conditioner. However, in some scenarios, for example, when the indoor temperature difference increases, or the air conditioner changes from silent or low wind mode to high wind mode, or the air conditioner changes from sleep or silent mode to heating mode, the operating frequency of the compressor may change. The sudden rise causes the coil temperature of the outdoor heat exchanger to drop, so the difference between the outdoor ambient temperature and the coil temperature of the outdoor heat exchanger becomes larger, and the air conditioner needs to defrost the outdoor heat exchanger. However, there may be no or less frost on the outdoor heat exchanger at this time. Defrosting the air conditioner will cause large fluctuations in indoor temperature, affecting the heating effect of the air conditioner and consuming energy. It should be noted that in the silent, low wind, and sleep modes, the operating frequency of the compressor in the air conditioner is small.

For example, in the silent mode, the indoor fan speed and the operating frequency of the compressor in the air conditioner are smaller to reduce the noise of the air conditioner and achieve a silent effect. In sleep mode, the indoor ambient temperature gradually decreases by gradually lowering the set temperature, simulating the natural adjustment process of human body temperature at night, thereby achieving energy saving effects while providing a comfortable sleeping environment. Generally, the low-wind mode is used when the indoor ambient temperature has met the demand but air flow is still needed. In the low-wind mode, the air conditioner reduces the air supply volume of the indoor unit to reduce air flow, thereby achieving energy saving effects.

In order to solve the above problems, some embodiments of the present disclosure provide an air conditioner 1000.

Figure 1 is a structural diagram of an air conditioner according to some embodiments.

In some embodiments, as shown in FIG. 1 , the air conditioner 1000 includes an indoor unit 10 and an outdoor unit 20 . The indoor unit 10 and the outdoor unit 20 are connected through pipelines to transport refrigerant.

It should be noted that FIG. 1 takes the air conditioner 1000 as a wall-mounted air conditioner and the indoor unit 10 is hung on an indoor wall as an example for illustration. Of course, the air conditioner 1000 in some embodiments of the present disclosure may also be a standing cabinet air conditioner. In addition, since the indoor unit 10 in FIG. 1 is located indoors and the outdoor unit 20 is located outdoors, the outdoor unit 20 is represented by a dotted line in FIG. 1 .

Figure 2 is another structural diagram of an air conditioner according to some embodiments.

In some embodiments, as shown in FIG. 2 , the indoor unit 10 includes an indoor heat exchanger 101 and an indoor fan 102 . The outdoor unit 20 includes a compressor 201, an outdoor heat exchanger 202, an outdoor fan 203, an expansion valve 204, and a four-way valve 205. The compressor 201, outdoor heat exchanger 202, expansion valve 204 and indoor heat exchanger 101 connected in sequence form a refrigerant circuit. The refrigerant circulates in the refrigerant circuit and exchanges heat with the air through the outdoor heat exchanger 202 and the indoor heat exchanger 101 respectively to realize the cooling mode or the heating mode of the air conditioner 1000 .

The compressor 201 is configured to compress the refrigerant so that the low-pressure refrigerant is compressed to form a high-pressure refrigerant.

The outdoor heat exchanger 202 is configured to perform heat exchange between outdoor air and the refrigerant transported in the outdoor heat exchanger 202 . For example, the outdoor heat exchanger 202 works as a condenser in the cooling mode of the air conditioner 1000, so that the refrigerant compressed by the compressor 201 dissipates heat to the outdoor air through the outdoor heat exchanger 202 and condenses; the outdoor heat exchanger 202 In the heating mode, the air conditioner 1000 operates as an evaporator, so that the decompressed refrigerant absorbs heat from the outdoor air through the outdoor heat exchanger 202 and evaporates. A coil is provided in the outdoor heat exchanger 202, and the coil is connected with the refrigerant circuit. The refrigerant flows in the coil of the outdoor heat exchanger 202 to exchange heat with the outdoor air.

The outdoor fan 203 is configured to suck outdoor air into the outdoor unit 20 through the outdoor air inlet of the outdoor unit 20 and send the outdoor air after heat exchange with the outdoor heat exchanger 202 through the outdoor air outlet of the outdoor unit 20 . The outdoor fan 203 provides power for the flow of outdoor air, so that the outdoor air flows through the outdoor heat exchanger 202 to exchange heat with the refrigerant in the outdoor heat exchanger 202 .

The expansion valve 204 is connected between the outdoor heat exchanger 202 and the indoor heat exchanger 101. The opening of the expansion valve 204 adjusts the pressure of the refrigerant flowing through the outdoor heat exchanger 202 and the indoor heat exchanger 101 to regulate the flow to the outdoors. The refrigerant flow rate between the heat exchanger 202 and the indoor heat exchanger 101. The refrigerant flowing between the outdoor heat exchanger 202 and the indoor heat exchanger 101 The flow rate and pressure will affect the heat exchange performance of the outdoor heat exchanger 202 and the indoor heat exchanger 101. The opening of the expansion valve 204 is adjustable to control the flow rate and pressure of the refrigerant flowing through the expansion valve 204 . For example, the expansion valve 204 expands the liquid refrigerant condensed in the condenser into a low-pressure liquid refrigerant. It should be noted that, in some embodiments of the present disclosure, the expansion valve 204 is provided in the outdoor unit 20 as an example for description. Of course, in some embodiments, the expansion valve 204 may also be provided in the indoor unit 10 .

The four-way valve 205 is connected to the refrigerant circuit and is configured to switch the flow direction of the refrigerant in the refrigerant circuit so that the air conditioner 1000 executes the cooling mode or the heating mode.

The indoor heat exchanger 101 is configured to perform heat exchange between indoor air and the refrigerant transported in the indoor heat exchanger 101 . For example, the indoor heat exchanger 101 works as an evaporator in the cooling mode of the air conditioner 1000, so that the refrigerant that has been dissipated through the outdoor heat exchanger 202 absorbs the heat of the indoor air through the indoor heat exchanger 101 and evaporates; the indoor heat exchanger 101 works as a condenser in the heating mode of the air conditioner 1000, so that the refrigerant that has absorbed heat through the outdoor heat exchanger 202 dissipates heat to the indoor air through the indoor heat exchanger 101 to be condensed. A coil is provided in the indoor heat exchanger 101, and the coil is connected with the refrigerant circuit. The refrigerant flows in the coil of the indoor heat exchanger 101 to exchange heat with the indoor air.

The indoor fan 102 is configured to suck indoor air into the indoor unit 10 through the indoor air inlet of the indoor unit 10 and send the indoor air after heat exchange with the indoor heat exchanger 101 through the indoor air outlet of the indoor unit 10 . The indoor fan 102 provides power for the flow of indoor air.

Figure 3 is a block diagram of an air conditioner according to some embodiments.

In some embodiments, as shown in FIG. 3 , the air conditioner 1000 further includes a controller 40 . The controller 40 is configured to control the operation of various components in the air conditioner 1000 to implement various predetermined functions of the air conditioner 1000 . For example, the controller 40 controls the operating frequency of the compressor 201, the opening of the expansion valve 204, and the rotation speed S of the indoor fan 102. Furthermore, the controller 40 is connected to the compressor 201, the expansion valve 204, the outdoor fan 203 and the indoor fan 102 through data lines to transmit communication information.

In some embodiments, as shown in FIG. 2 , the controller 40 includes a first sub-controller 401 and a second sub-controller 402 . The first sub-controller 401 is located in the indoor unit 10 , and the second sub-controller 402 is located in the outdoor unit 20 . Moreover, the first sub-controller 401 and the second sub-controller 402 are connected through signal lines, and can send or receive signals to each other. It should be noted that the first sub-controller 401 and the second sub-controller 402 may also be the same controller, and this disclosure does not limit this.

Controller 40 includes a processor. The processor may include a central processing unit (CPU), a microprocessor, an application specific integrated circuit (ASIC), and may be configured to operate when the processor executes storage coupled to the controller 40 When the program in the non-transitory computer-readable medium is loaded, the corresponding operations described in the controller 40 are performed.

In some embodiments, as shown in FIG. 1 , the air conditioner 1000 further includes a remote control 30 configured to communicate with the controller 40 to implement interaction between the user and the air conditioner 1000 .

In some embodiments, as shown in FIGS. 2 and 3 , the outdoor unit 20 further includes a first temperature sensor 207 and a third temperature sensor 206 . The first temperature sensor 207 is provided on the outdoor heat exchanger 202 and is configured to detect the outdoor ambient temperature (ie, the first temperature T1). The third temperature sensor 206 is disposed on the coil of the outdoor heat exchanger 202 and is configured to detect the third temperature T3 of the coil within the outdoor heat exchanger 202 . The controller 40 is coupled to the first temperature sensor 207 and the third temperature sensor 206 to receive the outdoor ambient temperature detected by the first temperature sensor 207 and the temperature of the coil in the outdoor heat exchanger 202 detected by the third temperature sensor 206 .

In some embodiments, as shown in FIGS. 2 and 3 , the indoor unit 10 further includes a second temperature sensor 104 and a fourth temperature sensor 103 . The second temperature sensor 104 is provided on the indoor heat exchanger 101 and is configured to detect the indoor ambient temperature (ie, the second temperature T2). The fourth temperature sensor 103 is provided on the coil of the indoor heat exchanger 101 and is configured to detect the fourth temperature T4 of the coil in the indoor heat exchanger 101 . The controller 40 is coupled to the second temperature sensor 104 and the fourth temperature sensor 103 to receive the temperature of the coil in the indoor heat exchanger 101 detected by the fourth temperature sensor 103 and the indoor ambient temperature detected by the second temperature sensor 104 .

Generally, the air conditioner 1000 can operate in cooling mode, heating mode, and defrost mode.

When the air conditioner 1000 operates in the cooling mode, the refrigerant flows through the compressor 201, the four-way valve 205, the outdoor heat exchanger 202, the expansion valve 204, the indoor heat exchanger 101 and the compressor 201 in sequence. The outdoor heat exchanger 202 serves as a condenser, and the indoor heat exchanger 101 serves as an evaporator. The condenser dissipates the heat of the refrigerant inside it to the outdoor air, and the evaporator The refrigerant absorbs heat from the indoor air to lower the indoor temperature to cool the indoor environment.

When the air conditioner 1000 operates in the heating mode, the refrigerant flows through the compressor 201, the four-way valve 205, the indoor heat exchanger 101, the expansion valve 204, the outdoor heat exchanger 202 and the compressor 201 in sequence. The indoor heat exchanger 101 serves as a condenser, and the outdoor heat exchanger 202 serves as an evaporator. The condenser dissipates the heat of the refrigerant inside it to the indoor air to increase the indoor temperature to heat the indoor environment. The refrigerant in the evaporator absorbs heat from the outdoor air.

For the air conditioner 1000 that adopts the reverse cycle defrosting method for defrosting, when the air conditioner 1000 operates in the defrost mode, the flow direction of the refrigerant is the same as the flow direction of the refrigerant when the air conditioner 1000 operates in the cooling mode.

The steps performed by the controller 40 in some embodiments of the present disclosure are described in detail below.

Figure 4 is a flowchart of steps performed by a controller in an air conditioner according to some embodiments.

In some embodiments, as shown in FIG. 4 , the controller 40 is configured to perform steps 11 to 15 .

In step 11, when the air conditioner 1000 is in the heating mode, the operating frequency F of the compressor 201 is obtained.

For example, when the controller 40 receives a heating signal (eg, a heating signal sent by the remote control 30 ), the controller 40 controls the operating status of the corresponding components in the air conditioner 1000 to perform heating. In this case, the controller 40 may determine that the air conditioner 1000 is in the heating mode. The controller 40 can obtain the current or voltage curve of the compressor 201 through a current or voltage sensor, and then calculate the operating frequency F of the compressor 201 based on the current or voltage curve. Of course, the method of determining that the air conditioner 1000 is in the heating mode and obtaining the operating frequency F of the compressor 201 is not limited to this, and the disclosure is not limited thereto.

After the air conditioner 1000 is turned on and operated for a period of time, the air conditioner 1000 tends to a stable state, and the operating frequency F of the compressor 201 is stable. When the air conditioner 1000 is running in the heating mode, when the indoor ambient temperature decreases, or the air conditioner 1000 changes from silent or low wind mode to high wind mode, or the air conditioner changes from sleep or silent mode to heating mode, the compression The operating frequency F of the machine 201 increases.

In step 12, it is determined that within the preset period G, the increase value ΔF of the operating frequency F of the compressor 201 is greater than the preset frequency threshold A, and the air conditioner 1000 is controlled to enter the false defrost mode.

When the air conditioner 1000 operates in the false defrost mode, the controller 40 controls the air conditioner 1000 to heat and controls the air conditioner 1000 not to perform defrosting. When the operating frequency F of the compressor 201 suddenly increases, the flow supply of the refrigerant is insufficient in a short period of time, causing the pressure of the evaporator (such as the outdoor heat exchanger 202) to drop, which in turn causes the third coil failure of the outdoor heat exchanger 202. Temperature T3 suddenly dropped.

FIG. 5 is a schematic diagram illustrating the corresponding relationship between the operating frequency of the compressor and the third temperature according to some embodiments.

For example, as shown in FIG. 5 , the line M represents the change of the operating frequency F of the compressor 201 over time. Line N represents the first change of the third temperature T3 with time. Line Q represents the second change of the third temperature T3 with time.

As shown by the line M in FIG. 5 , during the period from the first time t1 to the second time t2 , the operating frequency F of the compressor 201 suddenly rises from the first sub-frequency Fm1 to the second sub-frequency Fm2 . After the second time t2, the operating frequency F of the compressor 201 remains unchanged.

As shown by line N in Figure 5, starting from the first time t1, the third temperature T3 drops from the first sub-temperature T11 and drops to the second sub-temperature T12 at the third time t3, at which time the third temperature T3 reaches the minimum value. In this case, the difference between the outdoor ambient temperature (first temperature T1) and the third temperature T3 (eg, the second sub-temperature T12) (ie, the first temperature difference ΔTm1) may satisfy the condition for the air conditioner 1000 to perform defrosting. However, the decrease in the third temperature T3 is caused by the unstable operation of the compressor 201. In fact, there may be no frost or less frost on the outdoor heat exchanger 202. If the air conditioner 1000 operates in the defrost mode, the second temperature T2 of the indoor environment decreases, affecting the heating effect of the air conditioner 1000. It should be noted that the first temperature difference ΔTm1 is the outdoor temperature difference (that is, the difference between the outdoor ambient temperature and the temperature of the coil in the outdoor heat exchanger 202).

Moreover, as shown by the lines N and Q in Figure 5, after the fifth time t5, the third temperature T3 will rise back to a stable state and remain unchanged, or, as shown by the line Q, the third temperature T3 will rise at the fourth time t5. After time t4, it rises to the fourth sub-temperature T23 and remains unchanged for a short period of time. In this case, if the difference between the outdoor ambient temperature (first temperature T1) and the third temperature T3 (such as the third sub-temperature T13 or the fourth sub-temperature T23) does not meet the conditions for the air conditioner 1000 to defrost, the air conditioner 1000 will 1000 needs to be taken out of defrost mode and run in heating mode again. At this time, the defrosting time of the air conditioner 1000 is short, the required defrosting effect cannot be achieved, and energy is also consumed.

In order to solve the above problem, a preset frequency threshold A and a preset period G are set in some embodiments of the present disclosure.

The preset frequency threshold A is a preset threshold. The preset period G is a preset time period for detecting the operating frequency F of the compressor 201 .

The increase value ΔF of the operating frequency F of the compressor 201 refers to the increased value of the operating frequency F of the compressor 201 within the preset period G. For example, the operating frequency F of the compressor 201 last obtained by the controller 40 is recorded as the first operating frequency F (r-1), and the operating frequency F of the compressor 201 currently obtained by the controller 40 is recorded as the second operating frequency. F(r), r≥1. In this case, the increase value ΔF of the operating frequency F of the compressor 201 is the difference between the second operating frequency F(r) and the first operating frequency F(r-1) (ie, ΔF=F(r)- F(r-1)). If the increase value ΔF of the operating frequency F of the compressor 201 within the preset period G is greater than the preset frequency threshold A (ie, ΔF>A), the controller 40 determines that the operating frequency F of the compressor 201 is within a short time. Rapid rise. In this way, in order to prevent the air conditioner 1000 from mistakenly performing defrosting, the controller 40 may control the air conditioner 1000 to enter the false defrost mode, and then determine whether to control the air conditioner 1000 to enter the defrost mode.

In the case where the air conditioner 1000 operates in the defrost mode using the reverse cycle defrosting method, when the air conditioner 1000 enters the defrost mode, the indoor heat exchanger 101 in the air conditioner 1000 operates as an evaporator, and the outdoor heat exchanger in the air conditioner 1000 Heater 202 operates as a condenser. At this time, the outdoor heat exchanger 202 dissipates heat to melt the frost layer on the outdoor heat exchanger 202, thereby achieving defrosting. Of course, the present disclosure can also use other methods (such as hot gas bypass defrost and phase change energy storage defrost) for defrosting.

In some embodiments, the preset frequency threshold A is greater than or equal to 3 Hz. For example, the preset frequency threshold A is 3Hz, 4Hz, 6Hz, 8Hz or 10Hz, etc. When the air conditioner 1000 is operating, the operating frequency F of the compressor 201 may change slightly due to various reasons. If the preset frequency threshold A is set to a smaller value, the air conditioner 1000 may frequently enter the false defrost mode, affecting the normal operation of the air conditioner 1000 . Therefore, the preset frequency threshold A can be set to be greater than a certain value. It should be noted that different preset frequency thresholds A can be set according to the configuration of the air conditioner 1000 .

In some embodiments, the preset period G is greater than or equal to 1s and less than or equal to 1min (1s≤G≤1min). For example, the preset period G is 1s, 10s, 20s, 30s, 50s or 1min, etc. Since the duration of the sudden change in the operating frequency F of the compressor 201 is short, and the time the air conditioner 1000 is in an unstable state is short, the preset period G needs to be set to a smaller value to detect the operation of the compressor 201 in a timely manner. Changes in frequency F. In this way, through the preset period G, when the air conditioner 1000 is operating in the heating mode, the controller 40 can obtain the operating frequency F of the compressor 201 at regular intervals. It should be noted that different preset periods G may be preset according to the configuration of the air conditioner 1000 .

In step 13, it is determined that the operating frequency F of the compressor 201 when the air conditioner 1000 enters the false defrost mode is the first frequency Fr, and the first temperature difference ΔTm1 is the initial temperature difference ΔTm11, and the air conditioner 1000 is controlled to continue heating instead of defrosting.

When the operating frequency F of the compressor 201 suddenly increases, the third temperature T3 decreases rapidly. In this case, the difference between the first temperature T1 and the third temperature T3 cannot reflect the actual frosting condition of the outdoor heat exchanger 202. Therefore, the controller 40 cannot accurately determine whether defrosting is required based on the first temperature difference ΔTm1. If the controller 40 determines that the air conditioner 1000 is to be defrosted based on the decrease in the third temperature T3, the controller 40's judgment is incorrect and the air conditioner 1000 enters the defrost mode by mistake. Therefore, in the false defrost mode, even if the controller 40 determines that the third temperature T3 decreases, the controller 40 does not need to determine whether the third temperature T3 meets the defrost condition. At this time, the controller 40 controls the air conditioner 1000 to continue heating so as not to perform defrosting, thereby preventing the air conditioner 1000 from mistakenly entering the defrost mode and affecting the heating effect of the air conditioner 1000 .

It should be noted that the process of the controller 40 determining that the air conditioner 1000 enters the defrost mode is as follows: after the compressor 201 runs for a period of time, the controller 40 obtains the first temperature T1 and the first temperature T1 through the first temperature sensor 207 and the third temperature sensor 206 The third temperature T3. When the controller 40 determines that the first temperature T1 is less than or equal to the first temperature threshold, the third temperature T3 is less than or equal to the second temperature threshold, and the first temperature difference ΔTm1 is greater than or equal to the third temperature threshold, the air conditioner 1000 operates in the defrost mode . When the controller 40 detects that the third temperature T3 is greater than or equal to the fourth temperature threshold, the air conditioner 1000 exits the defrost mode. The first temperature threshold, the second temperature threshold, the third temperature threshold and the fourth temperature threshold are preset thresholds, which can be set according to actual needs, and this disclosure does not limit this. .

Since the first temperature difference ΔTm1 cannot represent the frosting condition of the outdoor unit 20 in the false defrost mode, after the air conditioner 1000 enters the false defrost mode, the controller 40 may not obtain the first temperature T1, or the controller 40 The first temperature T1 can be directly set to a fixed value, and the fixed value can be set to be greater than the first temperature threshold. In this way, in the false defrost mode, since the first temperature T1 does not meet the conditions for the air conditioner 1000 to enter the defrost mode, it is possible to prevent the air conditioner 1000 from entering the defrost mode. The unit 1000 enters defrost mode by mistake.

In step 14, when it is determined that the operating frequency F of the compressor 201 remains unchanged for at least two consecutive preset periods G, the operating frequency F of the compressor 201 at the current moment is determined to be the second frequency Fn.

After the air conditioner 1000 enters the false defrost mode, the changed operating frequency F of the compressor 201 remains stable after a period of time. Therefore, if the controller 40 determines that the operating frequency F of the compressor 201 remains unchanged for at least two consecutive preset periods G, the controller 40 determines that the operating frequency F of the compressor 201 has stabilized, and changes the operating frequency F of the compressor 201 at the current moment. The operating frequency F of 201 is determined as the second frequency Fn. For example, when N is equal to 2, if the controller 40 determines that the operating frequency F of the compressor 201 remains unchanged within two consecutive preset periods G, that is, if the controller 40 determines that the operating frequency F of the compressor 201 remains unchanged during the first preset period G. The operating frequency Fn(1) of the compressor 201 of G is the same as the operating frequency Fn(2) of the compressor 201 of G in the second preset period (Fn(1)=Fn(2)), then the controller 40 will The operating frequency Fr(2) of the compressor 201 at this time is determined as the second frequency Fn.

It should be noted that the second frequency Fn is the operating frequency F of the compressor 201 that remains stable in a short period of time when the operation of the air conditioner 1000 is unstable. Since the second frequency Fn only indicates that the operating frequency F of the compressor 201 is stable in a short period of time, the controller 40 can determine that the compressor 201 is stable only after the operating frequency F of the compressor 201 remains unchanged for longer than a certain period of time. The operating frequency F enters a stable state, thereby further confirming that the air conditioner 1000 operates stably.

In step 15, based on the first frequency Fr, the initial temperature difference ΔTm11 and the second frequency Fn, the air conditioner 1000 is controlled to run in the false defrost mode for a preset time H, and when the air conditioner 1000 runs in the false defrost mode for more than After the preset time H, the air conditioner 1000 is controlled to exit the false defrost mode.

Since the lower the operating frequency F of the compressor 201, the smaller the flow rate of the refrigerant, the higher the temperature of the refrigerant when evaporating in the evaporator (such as the outdoor heat exchanger 202), the higher the third temperature T3, and the higher the temperature of the outdoor heat exchanger 202. Not easy to frost. Therefore, the maximum operating frequency Fmax of the compressor 201 can be used as the upper limit to set different preset frequency ranges M, and then the controller 40 makes a judgment based on the first frequency Fr, the second frequency Fn and the different preset frequency ranges M, To determine the impact of the operating frequency F of the compressor 201 on the frosting of the outdoor heat exchanger 202 after the operating frequency F of the compressor 201 changes.

As the humidity of the outdoor environment increases, the outdoor heat exchanger 202 frosts faster, the third temperature T3 decreases faster, and the first temperature difference ΔTm1 becomes larger. Therefore, when different preset frequency ranges M are set in advance, the preset temperature difference B corresponding to the different preset frequency ranges M can also be set. In this way, the controller 40 can determine the impact of the humidity of the outdoor environment on the frosting of the outdoor heat exchanger 202 after the operating frequency F of the compressor 201 changes by comparing the initial temperature difference ΔTm11 with the preset temperature difference B.

In addition, since the operating frequency F of the compressor 201 is increased, the higher the increased operating frequency F, the longer it takes for the air conditioner 1000 to return to a stable state. Therefore, different preset time lengths H can be set according to different preset frequency ranges M.

For example, when the initial temperature difference ΔTm11 is greater than or equal to the preset temperature difference B, the humidity of the outdoor environment is relatively high, the outdoor heat exchanger 202 frosts quickly, and the outdoor heat exchanger 202 is prone to frost. In this case, the controller 40 controls the air conditioner 1000 to exit the false defrost mode and enter the heating mode, and determines whether the air conditioner 1000 performs defrost. When the initial temperature difference ΔTm11 is less than the preset temperature difference B, the humidity of the outdoor environment is low, the outdoor heat exchanger 202 frosts slowly, and there is no frost or less frost on the outdoor heat exchanger 202 .

Moreover, when the compressor 201 operates at medium or low frequency, the flow rate of the refrigerant is small, the temperature of the refrigerant when evaporating in the evaporator (such as the outdoor heat exchanger 202) is higher, and the frosting speed of the outdoor heat exchanger 202 is slower. Or difficult to frost. In this case, if the initial temperature difference ΔTm11 is smaller than the preset temperature difference B, then there is no frost or less frost on the outdoor heat exchanger 202, and the air conditioner 1000 does not need to defrost.

In addition, if the controller 40 determines that the first frequency Fr and the second frequency Fn are medium frequencies or low frequencies, the possibility of frost forming on the outdoor heat exchanger 202 is smaller. The higher the preset frequency range M in which the second frequency Fn is, the longer the controller 40 controls the air conditioner 1000 to operate in the false defrost mode (such as the preset time H).

It should be noted that if the controller 40 determines that the second frequency Fn is greater than the first frequency Fr, the controller 40 continues to determine the first frequency Fr, the second frequency Fn, and the initial temperature difference ΔTm11. If the controller 40 determines that the second frequency Fn is less than the first frequency Fr, the operating frequency F of the compressor 201 does not increase, and the controller 40 controls the air conditioner 1000 to exit the false defrost mode.

Therefore, some embodiments of the present disclosure provide an air conditioner 1000 for a situation where the first temperature difference ΔTm1 changes due to a change in the operating frequency F of the compressor 201, making the air conditioner 1000 easily enter the defrost mode by mistake. The controller 40 in the air conditioner 1000 controls the air conditioner 1000 to run in the false defrost mode for a preset time period H according to the first frequency Fr, the initial temperature difference ΔTm11 and the second frequency Fn, and does not perform defrosting, thereby preventing the air conditioner from 1000 Defrosting when there is no frost and frequent defrosting. Then, after the operating time of the air conditioner 1000 in the false defrost mode exceeds the preset time length H, the air conditioner 1000 returns to a stable state, and the controller 40 controls the air conditioner 1000 to exit the false defrost mode, so that the outdoor heat exchanger 202 When frost forms, the controller 40 can promptly control the air conditioner 1000 to exit the false defrost mode and perform a defrost determination, thereby improving the heat exchange effect of the air conditioner 1000. In addition, by controlling the air conditioner 1000 to enter the false defrost mode, the operation stability of the air conditioner 1000 can also be improved and energy consumption can be reduced.

In the air conditioner 1000 provided by some embodiments of the present disclosure, the controller 40 is based on the preset frequency range M where the first frequency Fr is located, the magnitude relationship between the initial temperature difference ΔTm11 and the preset temperature difference B, and the second frequency Fn. In the preset frequency range M, the controller 40 controls the air conditioner 1000 to run in the false defrost mode for a preset time H, and after the running time of the air conditioner 1000 in the false defrost mode exceeds the preset time H, controls the air conditioner 1000 Exit false defrost mode. This can avoid defrosting of the air conditioner 1000 when there is no frost and frequent defrost, improve the operating stability of the air conditioner 1000, and reduce energy consumption. Moreover, when the outdoor heat exchanger 202 is frosted, the controller 40 can promptly control the air conditioner 1000 to exit the false defrost mode, thereby improving the heat exchange effect of the air conditioner 1000.

Figure 6 is another flowchart of steps performed by a controller in an air conditioner according to some embodiments.

In some embodiments, the preset frequency range M includes a first frequency range M1, a second frequency range M2, a third frequency range M3, and a fourth frequency range M4. The first frequency range M1 is greater than 0 Hz and less than or equal to the first preset frequency F1. The second frequency range M2 is greater than the first preset frequency F1 and less than or equal to the second preset frequency F2. The third frequency range M3 is greater than the second preset frequency F2 and less than or equal to the third preset frequency F3. The fourth frequency range M4 is greater than the third preset frequency F3 and less than or equal to the maximum operating frequency Fmax of the compressor 201 . The first preset frequency F1 is less than the second preset frequency F2 (F1<F2), and the second preset frequency F2 is less than the third preset frequency F3 (F2<F3).

The preset temperature difference B includes a first preset temperature difference ΔTb1, a second preset temperature difference ΔTb2 and a third preset temperature difference ΔTb3. The preset time period H can be set according to the configuration of the air conditioner 1000.

In this case, as shown in FIG. 6 , step 15 performed by the controller 40 includes steps 151 to 155 .

In step 151, it is determined that the first frequency Fr is less than or equal to the first preset frequency F1 (Fr≤F1) and the initial temperature difference ΔTm11 is less than the first preset temperature difference ΔTb1 (ΔTm11<ΔTb1).

If the controller 40 determines that the first frequency Fr is less than or equal to the first preset frequency F1, then when the air conditioner 1000 enters the false defrost mode, the operating frequency F (first frequency Fr) of the compressor 201 is in the low frequency range, and the outdoor switching frequency Frost formation on the heater 202 is slow or difficult.

In this case, if the controller 40 determines that the initial temperature difference ΔTm11 is less than the first preset temperature difference ΔTb1, when the air conditioner 1000 enters the false defrost mode, the first temperature difference ΔTm1 (initial temperature difference ΔTm11) does not satisfy the requirements of the air conditioner. 1000 enters the defrost condition of defrost mode, in which case there is no frost or less frost on the outdoor heat exchanger 202 .

In step 152, it is determined that the second frequency Fn is less than or equal to the first preset frequency F1 (Fn≤F1), the air conditioner 1000 is controlled to run in the false defrost mode for the first preset duration H1, and the air conditioner 1000 is in the false defrost mode. After the operation time in the defrost mode exceeds the first preset time H1, the air conditioner 1000 is controlled to exit the false defrost mode.

After step 151, if the controller 40 further determines that the second frequency Fn is less than or equal to the first preset frequency F1, the air conditioner 1000 has briefly returned to a stable state after a certain period of time after the fluctuation, and the stabilized compressor 201 The operating frequency F (second frequency Fn) is still in the low frequency range. Therefore, after the controller 40 determines that the first frequency Fr is less than or equal to the first preset frequency F1, the initial temperature difference ΔTm11 is less than the first preset temperature difference ΔTb1, and the second frequency Fn is less than or equal to the first preset frequency F1, control The controller 40 first controls the air conditioner 1000 to run in the false defrost mode for a first preset time period H1 to avoid defrosting the air conditioner 1000 when the operation is unstable. Then, after the operating time of the air conditioner 1000 in the false defrost mode exceeds the first preset time length H1, the controller 40 controls the air conditioner 1000 to exit the false defrost mode to make a defrost determination.

It should be noted that the first preset frequency F1 can be determined according to the highest operating frequency Fmax of the compressor 201. For example, the first preset frequency F1 is equal to 30% of the highest operating frequency Fmax of the compressor 201 (F1=30%Fmax). The first preset frequency F1 is the frequency threshold when the compressor 201 operates at low frequency. When the operating frequency F of the compressor 201 When within the first frequency range M1, for example, when the first frequency Fr is less than the first preset frequency F1 (Fr≤F1) or the second frequency Fn is less than the first preset frequency F1 (Fn≤F1), the compressor 201 Operates at low frequencies.

In step 153, it is determined that the second frequency Fn is greater than the first preset frequency F1 and less than or equal to the second preset frequency F2 (F1<Fn≤F2), and the air conditioner 1000 is controlled to run the second preset frequency in the false defrost mode. Set the time length H2, and after the operating time of the air conditioner 1000 in the false defrost mode exceeds the second preset time length H2, the air conditioner 1000 is controlled to exit the false defrost mode.

After step 151, if the controller 40 further determines that the second frequency Fn is greater than the first preset frequency F1 and less than or equal to the second preset frequency F2, the air conditioner 1000 has briefly returned to stability after a certain period of time after the fluctuation. state, and the stabilized operating frequency F (second frequency Fn) of the compressor 201 is in the intermediate frequency range. In this case, the time required for the air conditioner 1000 to return to the steady state is higher than the time required for the air conditioner 1000 to return to the steady state when the compressor 201 operates at a low frequency.

Therefore, when the controller 40 determines that the first frequency Fr is less than or equal to the first preset frequency F1, the initial temperature difference ΔTm11 is less than the first preset temperature difference ΔTb1 and the second frequency Fn is greater than the first preset frequency F1 and less than or equal to After the second preset frequency F2, the controller 40 first controls the air conditioner 1000 to run in the false defrost mode for the second preset duration H2 to avoid defrosting the air conditioner 1000 when the operation is unstable. Then, after the operating time of the air conditioner 1000 in the false defrost mode exceeds the second preset time length H2, the controller 40 controls the air conditioner 1000 to exit the false defrost mode to perform a defrost determination. Here, the second preset time length H2 is greater than the first preset time length H1.

It should be noted that the second preset frequency F2 can be determined according to the highest operating frequency Fmax of the compressor 201. For example, the second preset frequency F2 is equal to half of the highest operating frequency Fmax of the compressor 201 (F2=1/2*Fmax). The second preset frequency F2 is the frequency threshold when the compressor 201 operates at a medium frequency. When the operating frequency F of the compressor 201 is within the second frequency range M2, for example, when the first frequency F1 is greater than the first preset frequency F1 and less than or equal to the second preset frequency F2, or the second frequency F2 is greater than the When a preset frequency F1 is less than or equal to the second preset frequency F2, the compressor 201 operates at an intermediate frequency.

In step 154, it is determined that the second frequency Fn is greater than the second preset frequency F2 and less than or equal to the third preset frequency F3 (F2<Fn≤F3), and the air conditioner 1000 is controlled to run the third preset frequency in the false defrost mode. Set the time length H3, and after the operating time of the air conditioner 1000 in the false defrost mode exceeds the third preset time length H3, the air conditioner 1000 is controlled to exit the false defrost mode.

After step 151, if the controller 40 further determines that the second frequency Fn is greater than the second preset frequency F2 and less than or equal to the third preset frequency F3 (F2<Fn≤F3), the air conditioner 1000 will operate at a certain frequency after the fluctuation. After a while, it has briefly returned to a stable state, and the stabilized operating frequency F (second frequency Fn) of the compressor 201 is in the medium to high frequency range. In this case, the time required for the air conditioner 1000 to return to the steady state is higher than the time required for the air conditioner 1000 to return to the steady state when the compressor 201 operates at an intermediate frequency.

Therefore, when the controller 40 determines that the first frequency Fr is less than or equal to the first preset frequency F1, the initial temperature difference ΔTm11 is less than the first preset temperature difference ΔTb1 and the second frequency Fn is greater than the second preset frequency F2 and less than or equal to After the third preset frequency F3, the controller 40 first controls the air conditioner 1000 to run in the false defrost mode for the third preset time period H3 to avoid defrosting the air conditioner 1000 when the operation is unstable. Then, after the operating time of the air conditioner 1000 in the false defrost mode exceeds the third preset time period H3, the controller 40 controls the air conditioner 1000 to exit the false defrost mode to perform a defrost determination. Here, the third preset time period H3 is greater than the second preset time period H2.

It should be noted that the third preset frequency F3 can be determined according to the highest operating frequency Fmax of the compressor 201 . For example, the third preset frequency F3 is equal to 70% of the highest operating frequency Fmax of the compressor 201 (F3=70%Fmax). The third preset frequency F3 is the frequency threshold when the compressor 201 operates at medium to high frequency. When the operating frequency of the compressor 201 is within the third frequency range M3, for example, when the first frequency Fr is greater than the second preset frequency F2 and less than or equal to the third preset frequency F3, or the second frequency Fn is greater than the second When the preset frequency F2 is less than or equal to the third preset frequency F3, the compressor 201 operates at a medium to high frequency.

In step 155, it is determined that the second frequency Fn is greater than the third preset frequency F3 (Fn>F3), the air conditioner 1000 is controlled to run in the false defrost mode for the fourth preset duration H4, and the air conditioner 1000 is in the false defrost mode. After the operating time in the mode exceeds the fourth preset time H4, the air conditioner 1000 is controlled to exit the false defrost mode.

After step 151, if the controller 40 further determines that the second frequency Fn is greater than the third preset frequency F3, the air conditioner 1000 has briefly returned to a stable state after a certain period of time after the fluctuation, and the stable operating frequency F (second frequency Fn) of the compressor 201 is in the high frequency range. In this case, the time required for the air conditioner 1000 to return to the steady state is higher than the time required for the air conditioner 1000 to return to the steady state when the compressor 201 operates at a medium to high frequency.

Therefore, after the controller 40 determines that the first frequency Fr is less than or equal to the first preset frequency F1, the initial temperature difference ΔTm11 is less than the first preset temperature difference ΔTb1, and the second frequency is greater than the third preset frequency F3, the controller 40 first The air conditioner 1000 is controlled to run in the false defrost mode for a fourth preset time period H4 to avoid defrosting when the air conditioner 1000 is running unstable. Then, after the operating time of the air conditioner 1000 in the false defrost mode exceeds the fourth preset time period H4, the controller 40 controls the air conditioner 1000 to exit the false defrost mode to perform a defrost determination. Here, the fourth preset time period H4 is greater than the third preset time period H3.

It should be noted that when the operating frequency of the compressor 201 is within the fourth frequency range M4, for example, when the second frequency Fn is greater than the third preset frequency F3, the compressor 201 operates at a high frequency.

If the preset frequency range M of the second frequency Fn after the change of the operating frequency F of the compressor 201 is higher, the longer the time it takes for the air conditioner 1000 to return to a stable state. Therefore, the first preset time length H1 is less than the second preset time length H2, the second preset time length H2 is less than the third preset time length H3, and the third preset time length H3 is less than the fourth preset time length H4, (that is, H1 < H2 ＜H3＜H4).

Figure 7 is yet another flowchart of steps performed by a controller in an air conditioner according to some embodiments.

In the case where the first frequency Fr and the initial temperature difference ΔTm11 cannot meet the conditions in step 151, as shown in FIG. 7, step 15 performed by the controller 40 also includes steps 156 to 159.

In step 156, it is determined that the first frequency Fr is greater than the first preset frequency F1 and less than or equal to the second preset frequency F2 (F1<Fr≤F2), and the initial temperature difference ΔTm11 is less than the second preset temperature difference ΔTb2 ( △Tm11＜△Tb2).

If the controller 40 determines that the first frequency Fr is greater than the first preset frequency F1 and less than or equal to the second preset frequency F2, then when the air conditioner 1000 enters the false defrost mode, the operating frequency F of the compressor 201 (first The frequency Fr) is in the medium frequency range, and frost forms on the outdoor heat exchanger 202 very slowly or with difficulty.

In this case, if the controller 40 determines that the initial temperature difference ΔTm11 is less than the second preset temperature difference ΔTb1, then when the air conditioner 1000 enters the false defrost mode, the first temperature difference ΔTm1 (initial temperature difference ΔTm11) does not satisfy the condition of the air conditioner. 1000 enters the defrost condition of defrost mode, in which case there is no frost or less frost on the outdoor heat exchanger 202 .

In step 157, it is determined that the second frequency Fn is greater than the first preset frequency F1 and less than or equal to the second preset frequency F2, and the air conditioner 1000 is controlled to run the fifth preset time period H5 in the false defrost mode, and in the air conditioner After the operating time of the air conditioner 1000 in the false defrost mode exceeds the fifth preset time period H5, the air conditioner 1000 is controlled to exit the false defrost mode.

After step 156, if the controller 40 further determines that the second frequency Fn is greater than the first preset frequency F1 and less than or equal to the second preset frequency F2, the air conditioner 1000 has briefly returned to stability after a certain period of time after the fluctuation. state, and the stabilized operating frequency F (second frequency Fn) of the compressor 201 is in the intermediate frequency range.

Therefore, when the controller 40 determines that the first frequency Fr is greater than the first preset frequency F1 and less than or equal to the second preset frequency F2, the initial temperature difference ΔTm11 is less than the second preset temperature difference ΔTb2, and the second frequency Fn is greater than the second preset frequency F2. After a preset frequency F1 becomes less than or equal to the second preset frequency F2, the controller 40 first controls the air conditioner 1000 to run in the false defrost mode for the fifth preset time period H5 to prevent the air conditioner 1000 from unstable operation. When defrosting is performed. Then, after the operating time of the air conditioner 1000 in the false defrost mode exceeds the fifth preset time period H5, the controller 40 controls the air conditioner 1000 to exit the false defrost mode to perform a defrost determination.

In step 158, it is determined that the second frequency Fn is greater than the second preset frequency F2 and less than or equal to the third preset frequency F3, and the air conditioner 1000 is controlled to run in the false defrost mode for the sixth preset duration H6, and in the air conditioner After the operating time of the air conditioner 1000 in the false defrost mode exceeds the sixth preset time period H6, the air conditioner 1000 is controlled to exit the false defrost mode.

After step 156, if the controller 40 further determines that the second frequency Fn is greater than the second preset frequency F2 and less than or equal to the third preset frequency F3, the air conditioner 1000 has briefly returned to stability after a certain period of time after the fluctuation. state, and the stabilized operating frequency F (second frequency Fn) of the compressor 201 is in the mid-to-high frequency range. In this case, the time required for the air conditioner 1000 to return to the steady state is higher than the time required for the air conditioner 1000 to return to the steady state when the compressor 201 operates at an intermediate frequency.

Therefore, when the controller 40 determines that the first frequency Fr is greater than the first preset frequency F1 and less than or equal to the second preset frequency F2, the initial temperature difference ΔTm11 is less than the second preset temperature difference ΔTb2, and the second frequency Fn is greater than the second preset frequency F2. Two preset frequencies F2, And after the frequency is less than or equal to the third preset frequency F3, the controller 40 first controls the air conditioner 1000 to run in the false defrost mode for the sixth preset duration H6 to avoid defrosting the air conditioner 1000 when the operation is unstable. Then, after the operating time of the air conditioner 1000 in the false defrost mode exceeds the sixth preset time period H6, the controller 40 controls the air conditioner 1000 to exit the false defrost mode to perform a defrost determination. Here, the sixth preset time period H6 is greater than the fifth preset time period H5.

In step 159, it is determined that the second frequency Fn is greater than the third preset frequency F3, the air conditioner 1000 is controlled to run in the false defrost mode for the seventh preset duration H7, and the air conditioner 1000 is controlled to run in the false defrost mode for the duration of the operation. After the seventh preset time H7 is exceeded, the air conditioner 1000 is controlled to exit the false defrost mode.

After step 156, if the controller 40 further determines that the second frequency Fn is greater than the third preset frequency F3, the air conditioner 1000 has briefly returned to a stable state after a certain period of time after the fluctuation, and the operation of the stabilized compressor 201 The frequency F (second frequency Fn) is in the high frequency range. In this case, the time required for the air conditioner 1000 to return to the steady state is higher than the time required for the air conditioner 1000 to return to the steady state when the compressor 201 operates at a medium to high frequency.

Therefore, when the controller 40 determines that the first frequency Fr is greater than the first preset frequency F1 and less than or equal to the second preset frequency F2, the initial temperature difference ΔTm11 is less than the second preset temperature difference ΔTb2 and the second frequency Fn is greater than the third After presetting the frequency F3, the controller 40 first controls the air conditioner 1000 to run in the false defrost mode for a seventh preset time period H7 to avoid defrosting the air conditioner 1000 when the operation is unstable. Then, after the operating time of the air conditioner 1000 in the false defrost mode exceeds the seventh preset time period H7, the air conditioner 1000 is controlled to exit the false defrost mode to perform a defrost determination. Here, the seventh preset time period H7 is greater than the sixth preset time period H6.

It should be noted that, when the outdoor ambient temperature (first temperature T1) remains unchanged, the greater the operating frequency F of the compressor 201, the lower the third temperature T3, the greater the first temperature difference ΔTm1, and the required pre-conditioning Assume that the larger the temperature difference B is. Therefore, the second preset temperature difference ΔTb2 is greater than the first preset temperature difference ΔTb1 (ie, ΔTb1<ΔTb2). In addition, if the second frequency Fn after the operating frequency F of the compressor 201 changes, the higher the preset frequency range M is, the longer it will take for the air conditioner 1000 to return to a stable state. Therefore, the fifth preset time length H5 is less than the sixth preset time length H6, and the sixth preset time length H6 is less than the seventh preset time length H7 (ie, H5<H6<H7).

Figure 8 is yet another flowchart of steps performed by a controller in an air conditioner according to some embodiments.

In the case where the first frequency Fr and the initial temperature difference ΔTm11 cannot meet the conditions in step 151 or step 156, as shown in FIG. 8 , step 15 performed by the controller 40 also includes steps 160 to 162.

In step 160, it is determined that the first frequency Fr is greater than the second preset frequency F2 and less than or equal to the third preset frequency F3 (F2<Fr≤F3), and the initial temperature difference ΔTm11 is less than the third preset temperature difference ΔTb3 ( △Tm11＜△Tb3).

If the controller 40 determines that the first frequency Fr is greater than the second preset frequency F2 and less than or equal to the third preset frequency F3, then when the air conditioner 1000 enters the false defrost mode, the operating frequency F of the compressor 201 (first The frequency Fr) is in the medium to high frequency range, and frost may form on the outdoor heat exchanger 202.

In this case, if the controller 40 determines that the initial temperature difference ΔTm11 is less than the third preset temperature difference ΔTb3, then when the air conditioner 1000 enters the false defrost mode, the first temperature difference ΔTm1 (initial temperature difference ΔTm11) does not satisfy the condition of the air conditioner. 1000 enters the defrost condition of defrost mode, in which case there is no frost or less frost on the outdoor heat exchanger 202 .

In step 161, it is determined that the second frequency Fn is greater than the second preset frequency F2 and less than or equal to the third preset frequency F3, and the air conditioner 1000 is controlled to run the eighth preset duration H8 in the false defrost mode, and in the air conditioner After the operating time of the air conditioner 1000 in the false defrost mode exceeds the eighth preset time period H8, the air conditioner 1000 is controlled to exit the false defrost mode.

After step 160, if the controller 40 further determines that the second frequency Fn is greater than the second preset frequency F2 and less than or equal to the third preset frequency F3, the air conditioner 1000 has briefly returned to stability after a certain period of time after the fluctuation. state, and the stabilized operating frequency F (second frequency Fn) of the compressor 201 is in the mid-to-high frequency range.

Therefore, when the controller 40 determines that the first frequency Fr is greater than the second preset frequency F2 and less than or equal to the third preset frequency F3, the initial temperature difference ΔTm11 is less than the third preset temperature difference ΔTb3, and the second frequency Fn is greater than the third preset frequency F3. After the second preset frequency F2 becomes less than or equal to the third preset frequency F3, the controller 40 first controls the air conditioner 1000 to run in the false defrost mode for the eighth preset duration H8 to avoid unstable operation of the air conditioner 1000. When defrosting is performed. Then, after the operating time of the air conditioner 1000 in the false defrost mode exceeds the eighth preset time period H8, the controller 40 controls the air conditioner 1000 to exit the false defrost mode to perform a defrost determination.

In step 162, it is determined that the second frequency Fn is greater than the third preset frequency F3, the air conditioner 1000 is controlled to run in the false defrost mode for the ninth preset duration H9, and the air conditioner 1000 is controlled to run in the false defrost mode for the duration of the operation. When exceeding the ninth preset After H9 is long, the air conditioner 1000 is controlled to exit the false defrost mode.

After step 160, if the controller 40 further determines that the second frequency Fn is greater than the third preset frequency F3, the air conditioner 1000 has briefly returned to a stable state after a certain period of time after the fluctuation, and the operation of the stabilized compressor 201 The frequency F (second frequency Fn) is in the high frequency range. In this case, the time required for the air conditioner 1000 to return to the stable operating state is higher than the time required for the air conditioner 1000 to return to the stable operating state when the compressor 201 operates at a medium to high frequency.

Therefore, when the controller 40 determines that the first frequency Fr is greater than the second preset frequency F2 and less than or equal to the third preset frequency F3, the initial temperature difference ΔTm11 is less than the third preset temperature difference ΔTb3, and the second frequency Fn is greater than the third preset frequency F3. After the third preset frequency F3, the controller 40 first controls the air conditioner 1000 to run in the false defrost mode for the ninth preset time period H9 to avoid defrosting the air conditioner 1000 when the operation is unstable. Then, after the operating time of the air conditioner 1000 in the false defrost mode exceeds the ninth preset time period H9, the controller 40 controls the air conditioner 1000 to exit the false defrost mode to perform a defrost determination. Here, the ninth preset time period H9 is greater than the eighth preset time period H8.

It should be noted that, when the outdoor ambient temperature (first temperature T1) remains unchanged, the greater the operating frequency F of the compressor 201, the lower the third temperature T3, the greater the first temperature difference ΔTm1, and the required pre-conditioning Assume that the larger the temperature difference B is. Therefore, the third preset temperature difference ΔTb3 is greater than the second preset temperature difference ΔTb2 (ie, ΔTb2<ΔTb3). In addition, if the second frequency Fn after the operating frequency F of the compressor 201 changes, the higher the preset frequency range M is, the longer it will take for the air conditioner 1000 to return to a stable state. Therefore, the eighth preset time period H8 is smaller than the ninth preset time period H9 (ie, H8<H9).

Figure 9 is yet another flowchart of steps performed by a controller in an air conditioner according to some embodiments.

In some embodiments, as shown in FIG. 9 , step 11 performed by controller 40 includes step 110 .

In step 110, it is determined that the operating time of the air conditioner 1000 in the heating mode reaches the target duration, and it is determined that the air conditioner 1000 is in the heating mode.

In some embodiments, the target duration is greater than or equal to 10 minutes. For example, the target duration is 10min, 11min or 12min, etc.

Usually, 10 minutes after the compressor 201 starts operating, the operating frequency F of the compressor 201 becomes stable, so that the overall operation of the air conditioner 1000 is stable. If the running time of the compressor 201 is less than 10 minutes after it starts running, the operating frequency F of the compressor 201 will fluctuate greatly, and the acquired data will change greatly and easily affect the accuracy of the judgment result. Therefore, it is necessary to determine the false defrost mode after the compressor 201 starts operating for a period of time.

Figure 10 is yet another flowchart of steps performed by a controller in an air conditioner according to some embodiments. Figure 11 is another flowchart of a controller of steps performed in an air conditioner according to some embodiments.

The above steps performed by the controller 40 are exemplarily described below with reference to FIGS. 10 and 11 .

As shown in FIG. 10 , the controller 40 is configured to perform steps 21 to 24 .

In step 21, when the air conditioner 1000 is in the heating mode, the operating frequency F of the compressor 201 is obtained.

In step 22, it is determined whether the increase value ΔF of the operating frequency F of the compressor 201 during the preset period G is greater than or equal to the preset frequency threshold A; if yes, step 23 is executed; if not, step 24 is executed.

In step 23, the air conditioner 1000 is controlled to enter the false defrost mode.

In step 24, the air conditioner 1000 is controlled to maintain the heating operation, and returns to step 21.

As shown in FIG. 11 , after entering the false defrost mode, the controller 40 is further configured to perform steps 25 to 29 .

In step 25, it is determined that the operating frequency F of the compressor 201 when the air conditioner 1000 enters the false defrost mode is the first frequency Fr, and the first temperature difference ΔTm1 is the initial temperature difference ΔTm11, and the air conditioner 1000 is controlled to heat instead of defrost.

In step 26 , the first preset frequency F1 , the second preset frequency F2 and the third preset frequency F3 are determined according to the highest operating frequency Fmax of the compressor 201 to obtain four preset frequency ranges M.

In step 27, when it is determined that the operating frequency F of the compressor 201 remains unchanged for at least two consecutive preset periods G, the operating frequency F of the compressor 201 at the current moment is determined to be the second frequency Fn.

In step 28, based on the relationship between the first frequency Fr and the second frequency Fn and the preset frequency range M, and the relationship between the initial temperature difference ΔTm11 and the preset temperature difference B, the requirements for operating the air conditioner 1000 in the false defrost mode are determined. The preset time period H is set, and the air conditioner 1000 is controlled to run in the false defrost mode for the preset time period H.

In step 29, after it is determined that the operating time of the air conditioner 1000 in the false defrost mode exceeds the preset time length H, the air conditioner 1000 is controlled to exit the false defrost mode.

The foregoing description mainly takes the controller 40 controlling the air conditioner 1000 to enter the false defrost mode according to the operating frequency F of the compressor 201 as an example. Of course, in some embodiments, the controller 40 may also control the air conditioner 1000 to enter the false defrost mode through other parameters.

Figure 12 is yet another flowchart of steps performed by a controller in an air conditioner according to some embodiments.

For example, as shown in Figure 12, steps 11 and 12 performed by the controller 40 may be replaced with steps 11' and 12'.

In step 11', when the air conditioner 1000 is in the heating mode, the set temperature and the second temperature T2 are obtained to determine the second temperature difference ΔTm2 (indoor temperature difference).

The second temperature difference ΔTm2 is the difference between the set temperature and the second temperature T2. The set temperature is a temperature preset according to the user's demand for indoor ambient temperature. The user can set the set temperature through the remote control 30 or the air conditioning application (Application, APP) on the mobile terminal or the control panel.

In step 12', it is determined that the increase value of the second temperature difference ΔTm2 within the preset period G is greater than or equal to the preset temperature difference threshold D, and the air conditioner 1000 is controlled to enter the false defrost mode.

The preset temperature difference threshold D is a preset threshold. The preset period G is similar to the preset period G in the previous relevant description, and will not be described again here. It should be noted that the preset period G here is used as the detection period of the second temperature difference ΔTm2.

For example, when the second temperature T2 cannot meet the user's needs, the set temperature needs to be increased to increase the second temperature T2. However, when the set temperature increases and the second temperature T2 does not increase, the second temperature difference ΔTm2 becomes larger. In this case, the controller 40 controls the operating frequency of the compressor 201 to increase to increase the heating capacity of the air conditioner 1000 .

For another example, when the air conditioner 1000 operates in the heating mode for a period of time, the second temperature T2 gradually increases, and the second temperature difference ΔTm2 becomes smaller. The smaller the second temperature difference ΔTm2 is, the closer the second temperature T2 is to the set temperature. That is to say, the indoor ambient temperature is close to the temperature set by the user. In this case, the operating frequency of the compressor 201 of the air conditioner is reduced from high frequency to low frequency. When the second temperature T2 is equal to the set temperature, the compressor 201 of the air conditioner 1000 keeps operating at a medium frequency or a low frequency.

While the compressor 201 is operating at medium or low frequency, frequent opening and closing of doors or people entering and exiting the room may cause the second temperature T2 to decrease, causing the second temperature difference ΔTm2 to become larger, causing the compressor 201 to increase frequency again. When the operating frequency F of the compressor 201 suddenly increases, the third temperature T3 decreases rapidly and is lower than the third temperature T3 when the compressor 201 operates at high frequency. In this case, there may be no frost or less frost on the outdoor unit 20. If the controller 40 determines whether the air conditioner 1000 performs defrosting based on the first temperature difference ΔTm1, the air conditioner 1000 may mistakenly enter defrost. mode causes the second temperature T2 to decrease, affecting the heating effect of the air conditioner 1000.

For another example, after the air conditioner 1000 changes from the silent or sleep mode to the low frequency or low wind heating mode, and the air conditioner 1000 runs in this mode (low frequency or low wind heating mode) for a period of time, the second temperature T2 is still less than When the temperature is set, the controller 40 controls the air conditioner 1000 to enter the high-wind heating mode. Or, after the air conditioner 1000 operates in the high wind or strong wind mode for a period of time, the second temperature T2 is the same as the set temperature, and the air conditioner 1000 switches to the low wind mode, the heat exchange capacity of the indoor heat exchanger 101 decreases, the second temperature T2 will increase. In this case, the current protection or the indoor coil overload protection may be triggered, so that the compressor 201 reduces the operating frequency F, so that the air conditioner 1000 operates in the low wind mode and the compressor 201 maintains low-frequency operation. In this way, after the air conditioner 1000 has been running for a period of time, if the air conditioner 1000 is adjusted to enter the high wind or strong wind mode, the operating frequency F of the compressor 201 will increase rapidly, and the third temperature T3 will decrease rapidly, so that the first temperature difference ΔTm1 satisfies defrost conditions. In this case, the controller 40 controls the air conditioner 1000 to enter the defrost mode, causing the second temperature T2 to decrease, affecting the heating effect of the air conditioner 1000.

Therefore, when the air conditioner 1000 is operating normally, the difference between the set temperature and the second temperature T2 (indoor temperature difference) may fluctuate slightly due to various reasons. In order to solve this problem, a preset temperature difference threshold D and a preset period G are set in some embodiments of the present disclosure.

The increased value of the second temperature difference ΔTm2 refers to the increased value of the second temperature difference ΔTm2 within the preset period G. For example, the second temperature difference ΔTm2 obtained last time by the controller 40 is recorded as the first indoor temperature difference ΔTm2 (p-1), and the second temperature difference ΔTm2 currently obtained by the controller 40 is recorded as the second indoor temperature difference ΔTm2 (p-1). p), p≥1. In this case, the increase value of the second temperature difference ΔTm2 is the difference between the second indoor temperature difference ΔTm2(p) and the first indoor temperature difference ΔTm2(p-1). If the increase value of the second temperature difference ΔTm2 within the preset period G is greater than the preset temperature difference threshold D, the controller 40 determines the second temperature difference △Tm2 increases rapidly in a short period of time, and the operating frequency F of the compressor 201 also increases in a short period of time. In this way, in order to prevent the air conditioner 1000 from mistakenly performing defrosting, the controller 40 may control the air conditioner 1000 to enter the false defrost mode, and then determine whether to control the air conditioner 1000 to enter the defrost mode. In this way, defrosting of the air conditioner 1000 when there is no frost and frequent defrosting can be avoided, thereby improving the operating stability of the air conditioner 1000 and reducing energy consumption.

In some embodiments, the preset temperature difference threshold D is greater than or equal to 1°C. For example, the preset temperature difference threshold D is 1°C, 2°C, 3°C, or 4°C, etc. When the air conditioner 1000 is operating, the second temperature difference ΔTm2 may change slightly due to various reasons. If the preset temperature difference threshold D is set to a smaller value, the air conditioner 1000 may frequently enter the false defrost mode, affecting the normal operation of the air conditioner 1000 . Therefore, the preset temperature difference threshold D can be set to be greater than a certain value. Different preset temperature difference thresholds D may be preset according to the configuration of the air conditioner 1000 .

The foregoing description mainly takes the controller 40 controlling the air conditioner 1000 to enter the false defrost mode according to the second temperature difference ΔTm2 as an example. Of course, in some embodiments, the controller 40 may also control the air conditioner 1000 to enter the false defrost mode through other parameters.

Figure 13 is yet another flowchart of steps performed by a controller in an air conditioner according to some embodiments.

For example, as shown in FIG. 13 , step 11 and step 12 performed by the controller 40 can also be replaced with step 11″ and step 12″.

In step 11″, when the air conditioner 1000 is in the heating mode, the rotation speed S of the indoor fan 102 is obtained.

In step 12″, it is determined that the increase value ΔS of the rotation speed S of the indoor fan 102 within the preset period G is greater than or equal to the preset rotation speed value C, and the air conditioner 1000 is controlled to enter the false defrost mode.

When the operating frequency F of the compressor 201 suddenly increases, the operating status of the corresponding components in the air conditioner 1000 changes. Parameters that represent fluctuations in the operating status of the air conditioner 1000 include the fourth temperature T4, the third temperature T3, the fifth temperature T5, the operating frequency F of the compressor 201, the rotation speed S of the indoor fan 102, and so on. Table 1 describes the degree of influence of the rotation speed S of the indoor fan 102 and the operating frequency F of the compressor 201 on the fourth temperature T4, the third temperature T3, and the fifth temperature T5 respectively. The number of “★” in Table 1 represents the degree of correlation. In other words, the greater the number of "★", the greater the impact. It should be noted that the fifth temperature T5 (discharge temperature) is the temperature at which the compressor 201 discharges the gaseous refrigerant.

Table 1 The relationship between the rotation speed of the indoor fan and the operating frequency of the compressor and the third temperature, the fourth temperature and the fifth temperature

When the rotation speed S of the indoor fan 102 suddenly changes, the air conditioner 1000 may fluctuate. For example, when the heating demand increases, the rotation speed S of the indoor fan 102 can be increased to meet the heating demand. When the air conditioner 1000 increases the air output volume, or changes from the sleep or silent mode to the heating mode, the rotation speed S of the indoor fan 102 will be increased. As can be seen from Table 1, a sudden change in the rotation speed S of the indoor fan 102 has a greater impact on the fourth temperature T4. Therefore, the controller 40 can control the air conditioner 1000 according to the rotation speed S of the indoor fan 102 to prevent the air conditioner 1000 from being uncontrolled. Defrosting during frost and frequent defrosting can improve the operational stability of the air conditioner 1000 and reduce energy consumption.

Therefore, the preset rotation speed value C and the preset period G are set in some embodiments of the present disclosure.

The preset rotation speed value C is a preset threshold. The preset period G is similar to the preset period G in the previous relevant description, and will not be described again here. It should be noted that the preset period G here serves as the detection period of the rotation speed S of the indoor fan 102 .

The increase value ΔS of the rotation speed S of the indoor fan 102 refers to the increase value of the rotation speed S of the indoor fan 102 within the preset period G. When the air conditioner 1000 is operating normally, the rotation speed S of the indoor fan 102 may fluctuate slightly due to various reasons. For example, the rotation speed S of the indoor fan 102 obtained by the controller 40 last time is recorded as the first rotation speed S (q-1), and the rotation speed S of the indoor fan 102 obtained by the controller 40 currently is recorded as the second rotation speed S (q). , and q≥1. In this case, the increase value ΔS of the rotation speed S of the indoor fan 102 is the difference between the second rotation speed S(q) and the first rotation speed S(q-1) (ie, ΔS=S(q)-S(q -1)). If it is determined that the increase value ΔS of the rotation speed S of the indoor fan 102 is greater than or equal to the preset rotation speed value C within the preset period G, the controller 40 determines that the rotation speed S of the indoor fan 102 increases rapidly in a short period of time, causing the air conditioner to 1000 fluctuates. In this way, in order to prevent the air conditioner 1000 from mistakenly performing defrosting, the controller 40 may control the air conditioner 1000 to enter the false defrost mode, and then determine whether to control the air conditioner 1000 to enter the defrost mode. In this way, defrosting of the air conditioner 1000 when there is no frost and frequent defrosting can be avoided, thereby improving the operating stability of the air conditioner 1000 and reducing energy consumption.

In some embodiments, the preset rotation speed value C is greater than or equal to 50 r/min. For example, the preset rotation speed value C is 50r/min, 60r/min or 70r/min. If the preset rotation speed value C is set to a smaller value, the air conditioner 1000 may frequently enter the false defrost mode, affecting the normal operation of the air conditioner 1000 . Therefore, the preset rotation speed value C can be set to be greater than a certain value. It should be noted that the preset rotation speed value C is a rotation speed value preset based on experiments.

The increase of the second temperature difference ΔTm2 or the increase value ΔS of the rotation speed S of the indoor fan 102 will cause the operating frequency F of the compressor 201 to increase rapidly, causing the air conditioner 1000 to fluctuate, the third temperature T3 to decrease rapidly, and the first temperature difference △Tm1 satisfies the defrosting condition, so the controller 40 controls the air conditioner 1000 to enter the defrost mode. Moreover, after the air conditioner 1000 fluctuates due to changes in the operating frequency F of the compressor 201, the air conditioner 1000 tends to be stable after a certain period of time. Therefore, when the operating frequency F of the compressor 201 suddenly rises and within a subsequent period of time, the first temperature difference ΔTm1 cannot indicate the frost formation of the outdoor unit 20 . Therefore, the controller 40 cannot accurately determine whether the first temperature difference ΔTm1 meets the defrosting condition.

Therefore, in order to avoid defrosting of the air conditioner 1000 when there is no frost and frequent defrost, some embodiments of the present disclosure provide the air conditioner 1000 . Through the increase value of the second temperature difference ΔTm2 within the preset period G, or the increase value ΔS of the rotation speed S of the indoor fan 102, the controller 40 can control the air conditioner 1000 to enter the false defrost mode, and then determine whether to control the air conditioner 1000 to enter the false defrost mode. Defrost mode. In this way, defrosting of the air conditioner 1000 when there is no frost and frequent defrosting can be avoided, thereby improving the operating stability of the air conditioner 1000 and reducing energy consumption.

It should be noted that the motor of the indoor fan 102 may be a PG motor. The PG motor is a motor with a Hall element and a rotational speed feedback circuit to feed back the rotational speed S of the indoor fan 102 . The controller 40 can obtain the rotation speed S of the indoor fan 102 through the rotation speed feedback circuit. Of course, the controller 40 can obtain the rotation speed S of the indoor fan 102 through other methods, and this disclosure does not limit this.

In some embodiments, as shown in Figure 9, step 11' or 11" performed by the controller 40 includes step 110'.

In step 110', it is determined that the operating time of the air conditioner 1000 in the heating mode reaches the target duration, and it is determined that the air conditioner 1000 is in the heating mode. Here, the target duration can be greater than or equal to 20 minutes. For example, the target duration is 20min, 21min or 22min, etc.

The above steps performed by the controller 40 are exemplarily described below with reference to FIG. 14 .

In some embodiments, as shown in Figure 14, steps 21 and 22 performed by the controller 40 may be replaced with steps 21' and 22'.

In step 21', it is determined that the air conditioner 1000 is in the heating mode, and the set temperature and the second temperature T2 are obtained, or the rotation speed S of the indoor fan 102 is obtained.

In step 22', it is determined whether the increase value of the second temperature difference ΔTm2 is greater than or equal to the preset temperature difference threshold D within the preset period G, or whether the increase value ΔS of the rotation speed S of the indoor fan 102 is greater than or equal to the preset value. Speed value C. If yes, go to step 23; if not, go to step 24.

To prevent the air conditioner 1000 from being defrosted when there is no frost and from being defrosted frequently, some embodiments of the present disclosure provide the air conditioner 1000 . By judging the increase value ΔF of the operating frequency F of the compressor 201 or the increase value ΔS of the rotation speed S of the indoor fan 102, the air conditioner 1000 can be prevented from being defrosted by mistake, thereby preventing the air conditioner 1000 from defrosting frequently when there is no frost. defrosting conditions, thereby improving the operational stability of the air conditioner 1000 and reducing energy consumption.

Some embodiments of the present disclosure also provide a defrost control method for an air conditioner, which method is applied to a controller. The air conditioner has a similar structure to the air conditioner 1000 described above. For example, the air conditioner includes the above-mentioned indoor unit 10 and the above-mentioned outdoor unit 20 . The outdoor unit 20 includes a compressor 201.

In this case, as shown in Figure 4, the method includes steps 31 to 35.

In step 31, when the air conditioner 1000 is in the heating mode, the operating frequency F of the compressor 201 is obtained.

In step 32, it is determined that within the preset period G, the increase value ΔF of the operating frequency F of the compressor 201 is greater than the preset frequency threshold A, and the air conditioner 1000 is controlled to enter the false defrost mode.

In step 33, it is determined that the operating frequency F of the compressor 201 when the air conditioner 1000 enters the false defrost mode is the first frequency Fr, and the first temperature difference ΔTm1 is the initial temperature difference ΔTm11, and the air conditioner 1000 is controlled to continue heating instead of defrosting.

In step 34, when it is determined that the operating frequency F of the compressor 201 remains unchanged for at least two consecutive preset periods G, the operating frequency F of the compressor 201 at the current moment is determined to be the second frequency Fn.

In step 35, the air conditioner 1000 is controlled according to the first frequency Fr, the initial temperature difference ΔTm11 and the second frequency Fn. The false defrost mode is operated for a preset time H, and after the air conditioner 1000 is operated in the false defrost mode for more than the preset time H, the air conditioner 1000 is controlled to exit the false defrost mode.

In some embodiments, as shown in Figure 6, step 35 includes steps 351 to 355.

In step 351, it is determined that the first frequency Fr is less than or equal to the first preset frequency F1 (Fr≤F1) and the initial temperature difference ΔTm11 is less than the first preset temperature difference ΔTb1 (ΔTm11<ΔTb1).

In step 352, it is determined that the second frequency Fn is less than or equal to the first preset frequency F1 (Fn≤F1), the air conditioner 1000 is controlled to run in the false defrost mode for the first preset duration H1, and the air conditioner 1000 is in the false defrost mode. After the operation time in the defrost mode exceeds the first preset time H1, the air conditioner 1000 is controlled to exit the false defrost mode.

In step 353, it is determined that the second frequency Fn is greater than the first preset frequency F1 and less than or equal to the second preset frequency F2 (F1<Fn≤F2), and the air conditioner 1000 is controlled to run the second preset frequency in the false defrost mode. Set the time length H2, and after the operating time of the air conditioner 1000 in the false defrost mode exceeds the second preset time length H2, the air conditioner 1000 is controlled to exit the false defrost mode.

In step 354, it is determined that the second frequency Fn is greater than the second preset frequency F2 and less than or equal to the third preset frequency F3 (F2<Fn≤F3), and the air conditioner 1000 is controlled to run the third preset frequency in the false defrost mode. Set the time length H3, and after the operating time of the air conditioner 1000 in the false defrost mode exceeds the third preset time length H3, the air conditioner 1000 is controlled to exit the false defrost mode.

In step 355, it is determined that the second frequency Fn is greater than the third preset frequency F3 (Fn>F3), the air conditioner 1000 is controlled to run in the false defrost mode for the fourth preset duration H4, and the air conditioner 1000 is in the false defrost mode. After the operating time in the mode exceeds the fourth preset time H4, the air conditioner 1000 is controlled to exit the false defrost mode.

Here, the first preset frequency F1 is smaller than the second preset frequency F2, and the second preset frequency F2 is smaller than the third preset frequency F3. The first preset time length H1 is less than the second preset time length H2, the second preset time length H2 is less than the third preset time length H3, and the third preset time length H3 is less than the fourth preset time length H4.

In the case where the first frequency Fr and the initial temperature difference ΔTm11 cannot meet the conditions in step 351, as shown in FIG. 7, step 35 also includes steps 356 to 359.

In step 356, it is determined that the first frequency Fr is greater than the first preset frequency F1 and less than or equal to the second preset frequency F2 (F1<Fr≤F2), and the initial temperature difference ΔTm11 is less than the second preset temperature difference ΔTb2 ( △Tm11＜△Tb2).

In step 357, it is determined that the second frequency Fn is greater than the first preset frequency F1 and less than or equal to the second preset frequency F2, and the air conditioner 1000 is controlled to run the fifth preset time period H5 in the false defrost mode, and in the air conditioner After the operating time of the air conditioner 1000 in the false defrost mode exceeds the fifth preset time period H5, the air conditioner 1000 is controlled to exit the false defrost mode.

In step 358, it is determined that the second frequency Fn is greater than the second preset frequency F2 and less than or equal to the third preset frequency F3, and the air conditioner 1000 is controlled to run in the false defrost mode for the sixth preset duration H6, and in the air conditioner After the operating time of the air conditioner 1000 in the false defrost mode exceeds the sixth preset time period H6, the air conditioner 1000 is controlled to exit the false defrost mode.

In step 359, it is determined that the second frequency Fn is greater than the third preset frequency F3, the air conditioner 1000 is controlled to run in the false defrost mode for the seventh preset duration H7, and the air conditioner 1000 is controlled to run in the false defrost mode for the duration of the operation. After the seventh preset time H7 is exceeded, the air conditioner 1000 is controlled to exit the false defrost mode.

Here, the second preset temperature difference ΔTb2 is greater than the first preset temperature difference ΔTb1. The fifth preset duration H5 is shorter than the sixth preset duration H6, and the sixth preset duration H6 is shorter than the seventh preset duration H7.

In the case where the first frequency Fr and the initial temperature difference ΔTm11 cannot meet the conditions in steps 351 and 356, as shown in FIG. 8, step 35 also includes steps 360 to 362.

In step 360, it is determined that the first frequency Fr is greater than the second preset frequency F2 and less than or equal to the third preset frequency F3 (F2<Fr≤F3), and the initial temperature difference ΔTm11 is less than the third preset temperature difference ΔTb3 ( △Tm11＜△Tb3).

In step 361, it is determined that the second frequency Fn is greater than the second preset frequency F2 and less than or equal to the third preset frequency F3, and the air conditioner 1000 is controlled to run the eighth preset duration H8 in the false defrost mode, and in the air conditioner After the operating time of the air conditioner 1000 in the false defrost mode exceeds the eighth preset time period H8, the air conditioner 1000 is controlled to exit the false defrost mode.

In step 362, it is determined that the second frequency Fn is greater than the third preset frequency F3, the air conditioner 1000 is controlled to run in the false defrost mode for the ninth preset duration H9, and the air conditioner 1000 is operated in the false defrost mode for the duration of the operation. After exceeding the ninth preset time H9, the air conditioner 1000 is controlled to exit the false defrost mode.

Here, the third preset temperature difference ΔTb3 is greater than the second preset temperature difference ΔTb2. The eighth preset duration H8 is less than the ninth preset time Long H9.

In some embodiments, as shown in Figure 9, step 31 includes step 310.

In step 310, it is determined that the operating time of the air conditioner 1000 in the heating mode reaches the target duration, and it is determined that the air conditioner 1000 is in the heating mode.

The defrost control method of the air conditioner mentioned above is mainly explained by taking the example of controlling the air conditioner 1000 to enter the false defrost mode according to the operating frequency F of the compressor 201. Of course, in some embodiments, the air conditioner 1000 can also be controlled to enter the false defrost mode through other parameters.

For example, as shown in Figure 12, step 31 and step 32 can be replaced by step 31' and step 32'.

In step 31', when the air conditioner 1000 is in the heating mode, the set temperature and the second temperature T2 are obtained to determine the second temperature difference ΔTm2 (indoor temperature difference).

In step 32', it is determined that the increase value of the second temperature difference ΔTm2 within the preset period G is greater than or equal to the preset temperature difference threshold D, and the air conditioner 1000 is controlled to enter the false defrost mode.

For example, as shown in Figure 13, step 31 and step 32 performed by the controller 40 can also be replaced by step 31" and step 32".

In step 31″, when the air conditioner 1000 is in the heating mode, the rotation speed S of the indoor fan 102 is obtained.

In step 32″, it is determined that the increase value ΔS of the rotation speed S of the indoor fan 102 within the preset period G is greater than or equal to the preset rotation speed value C, and the air conditioner 1000 is controlled to enter the false defrost mode.

It should be noted that the defrosting control method for an air conditioner provided by some embodiments of the present disclosure is the same as all the process steps executed by the controller 40 in the air conditioner provided by the above embodiments, and the working principles and beneficial effects of the two are the same. There is a corresponding correspondence, so I won’t go into details here.

In the defrost control method of the air conditioner provided by some embodiments of the present disclosure, the air conditioner 1000 can be controlled to enter the air conditioner according to the operating frequency F of the compressor 201, or the difference between the set temperature and the indoor temperature, or the rotation speed S of the indoor fan 102. False defrost mode. Moreover, the air conditioner 1000 can be controlled to run in the false defrost mode for a preset time H according to the first frequency Fr, the initial temperature difference ΔTm11 and the second frequency Fn, so as to avoid defrosting the air conditioner 1000 when there is no frost and frequent defrost. In this case, after the operating time of the air conditioner 1000 in the false defrost mode exceeds the preset time length H, the air conditioner 1000 is controlled to exit the false defrost mode, thereby improving the operating stability of the air conditioner 1000 and reducing energy consumption.

In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

Those skilled in the art will understand that the disclosed scope of the present invention is not limited to the specific embodiments described above, and that certain elements of the embodiments may be modified and replaced without departing from the spirit of the application. The scope of the application is limited by the appended claims.

Claims

An air conditioner including:

Indoor unit;

An outdoor unit includes a compressor, an outdoor heat exchanger, and a first temperature sensor, the first temperature sensor being disposed on the outdoor heat exchanger and configured to detect outdoor ambient temperature; and

A controller configured to:

When the air conditioner is in the heating mode, obtain the operating parameters of the air conditioner;

Control the air conditioner to enter the false defrost mode according to the operating parameters;

It is determined that the operating frequency of the compressor when the air conditioner enters the false defrost mode is the first frequency and the outdoor temperature difference when the air conditioner enters the false defrost mode is the initial temperature difference, and the air conditioner is controlled The outdoor temperature difference is the difference between the outdoor ambient temperature and the temperature of the coil in the outdoor heat exchanger;

If it is determined that the operating frequency of the compressor remains unchanged for at least two consecutive preset periods, determine the operating frequency of the compressor at the current moment as the second frequency;

According to the first frequency, the initial temperature difference and the second frequency, the air conditioner is controlled to run in the false defrost mode for a preset time, and when the air conditioner is in the false defrost mode After the operation time exceeds the preset time period, the air conditioner is controlled to exit the false defrost mode.
The air conditioner of claim 1, wherein the operating parameters include the operating frequency of the compressor, and the controller is configured to:

When the air conditioner is in the heating mode, obtain the operating frequency of the compressor;

If it is determined that the increase in the operating frequency of the compressor within the preset period is greater than the preset frequency threshold, the air conditioner is controlled to enter the false defrost mode.
The air conditioner of claim 2, wherein after determining the second frequency, the controller is configured to:

If it is determined that the first frequency is less than or equal to the first preset frequency, the initial temperature difference is less than the first preset temperature difference, and the second frequency is less than or equal to the first preset frequency, the air conditioner is controlled to Run the false defrost mode for a first preset time period, and after the air conditioner runs in the false defrost mode for more than the first preset time period, control the air conditioner to exit the false defrost mode. model;

If it is determined that the first frequency is less than or equal to the first preset frequency, the initial temperature difference is less than the first preset temperature difference, and the second frequency is greater than the first preset frequency and less than or equal to The second preset frequency controls the air conditioner to run in the false defrost mode for a second preset time period, and after the air conditioner runs in the false defrost mode for a second preset time period, , controlling the air conditioner to exit the false defrost mode;

If it is determined that the first frequency is less than or equal to the first preset frequency, the initial temperature difference is less than the first preset temperature difference, and the second frequency is greater than the second preset frequency and less than or equal to The third preset frequency controls the air conditioner to run in the false defrost mode for a third preset time period, and after the air conditioner runs in the false defrost mode for a third preset time period, , controlling the air conditioner to exit the false defrost mode;

If it is determined that the first frequency is less than or equal to the first preset frequency, the initial temperature difference is less than the first preset temperature difference, and the second frequency is greater than the third preset frequency, the air conditioner is controlled The air conditioner operates in the false defrost mode for a fourth preset time period, and after the air conditioner operates in the false defrost mode for more than the fourth preset time period, the air conditioner is controlled to exit the false defrost mode. defrost mode; where

The first preset frequency is less than the second preset frequency, the second preset frequency is less than the third preset frequency, the first preset duration is less than the second preset duration, and the The second preset time length is less than the third preset time length, the third preset time length is less than the fourth preset time length, and the preset time length includes the first preset time length, the second preset time length duration, the third preset duration and the fourth preset duration.
The air conditioner according to claim 3, wherein after determining the second frequency, the controller is further configured to:

If it is determined that the first frequency is greater than the first preset frequency and less than or equal to the second preset frequency, the initial temperature difference is less than the second preset temperature difference, and the second frequency is greater than the first The preset frequency is less than or equal to the second preset frequency, and the air conditioner is controlled to run in the false defrost mode for a fifth preset duration, and when the air conditioner is in the false defrost mode After the operation time exceeds the fifth preset time period, the air conditioner is controlled to exit the false state. defrost mode;

If it is determined that the first frequency is greater than the first preset frequency and less than or equal to the second preset frequency, the initial temperature difference is less than the second preset temperature difference, and the second frequency is greater than the The second preset frequency, which is less than or equal to the third preset frequency, controls the air conditioner to run in the false defrost mode for a sixth preset duration, and when the air conditioner operates in the false defrost mode After the operating time in the mode exceeds the sixth preset time, control the air conditioner to exit the false defrost mode;

If it is determined that the first frequency is greater than the first preset frequency and less than or equal to the second preset frequency, the initial temperature difference is less than the second preset temperature difference, and the second frequency is greater than the The third preset frequency controls the air conditioner to run in the false defrost mode for a seventh preset time period, and when the air conditioner runs in the false defrost mode for a time period exceeding the seventh preset time, After a certain period of time, the air conditioner is controlled to exit the false defrost mode; where

The second preset temperature difference is greater than the first preset temperature difference, the fifth preset time length is less than the sixth preset time length, the sixth preset time length is less than the seventh preset time length, and the The preset duration includes the fifth preset duration, the sixth preset duration, and the seventh preset duration.
The air conditioner according to claim 4, wherein after determining the second frequency, the controller is further configured to:

If it is determined that the first frequency is greater than the second preset frequency and less than or equal to the third preset frequency, the initial temperature difference is less than the third preset temperature difference, and the second frequency is greater than the second preset frequency. The preset frequency is less than or equal to the third preset frequency, and the air conditioner is controlled to run in the false defrost mode for an eighth preset duration, and when the air conditioner is in the false defrost mode After the operation time exceeds the eighth preset time period, control the air conditioner to exit the false defrost mode;

If it is determined that the first frequency is greater than the second preset frequency and less than or equal to the third preset frequency, the initial temperature difference is less than the third preset temperature difference, and the second frequency is greater than the third preset frequency. The preset frequency controls the air conditioner to run in the false defrost mode for a ninth preset time period, and after the air conditioner runs in the false defrost mode for a time period exceeding the ninth preset time period , controlling the air conditioner to exit the false defrost mode; where

The third preset temperature difference is greater than the second preset temperature difference, the eighth preset time length is less than the ninth preset time length, and the preset time length includes the eighth preset time length and the ninth preset time length. Default duration.
The air conditioner according to claim 1, wherein the indoor unit includes an indoor heat exchanger and a second temperature sensor, the second temperature sensor is provided on the indoor heat exchanger and is configured to detect the indoor environment. temperature, the operating parameters include the set temperature and the indoor temperature difference, the indoor temperature difference is the difference between the set temperature and the indoor ambient temperature, the set temperature is the required indoor ambient temperature, the controller is configured as:

When the air conditioner is in the heating mode, obtain the set temperature and the indoor temperature difference;

If it is determined that the increase in the indoor temperature difference within the preset period is greater than the preset temperature difference threshold, the air conditioner is controlled to enter the false defrost mode.
The air conditioner of claim 6, wherein after determining the second frequency, the controller is configured to:

If it is determined that the first frequency is less than or equal to the first preset frequency, the initial temperature difference is less than the first preset temperature difference, and the second frequency is less than or equal to the first preset frequency, the air conditioner is controlled to Run the false defrost mode for a first preset time period, and after the air conditioner runs in the false defrost mode for more than the first preset time period, control the air conditioner to exit the false defrost mode. model;

If it is determined that the first frequency is less than or equal to the first preset frequency, the initial temperature difference is less than the first preset temperature difference, and the second frequency is greater than the first preset frequency and less than or equal to The second preset frequency controls the air conditioner to run in the false defrost mode for a second preset time period, and after the air conditioner runs in the false defrost mode for a second preset time period, , controlling the air conditioner to exit the false defrost mode;

If it is determined that the first frequency is less than or equal to the first preset frequency, the initial temperature difference is less than the first preset temperature difference, and the second frequency is greater than the second preset frequency and less than or equal to The third preset frequency controls the air conditioner to run in the false defrost mode for a third preset time period, and after the air conditioner runs in the false defrost mode for a third preset time period, , controlling the air conditioner to exit the false defrost mode;

If it is determined that the first frequency is less than or equal to the first preset frequency, the initial temperature difference is less than the first preset frequency. The temperature difference, and the second frequency is greater than the third preset frequency, controls the air conditioner to operate in the false defrost mode for a fourth preset duration, and when the air conditioner operates in the false defrost mode After the duration exceeds the fourth preset duration, the air conditioner is controlled to exit the false defrost mode; wherein

The first preset frequency is less than the second preset frequency, the second preset frequency is less than the third preset frequency, the first preset duration is less than the second preset duration, and the The second preset time length is less than the third preset time length, the third preset time length is less than the fourth preset time length, and the preset time length includes the first preset time length, the second preset time length duration, the third preset duration and the fourth preset duration.
The air conditioner according to claim 7, wherein after determining the second frequency, the controller is further configured to:

If it is determined that the first frequency is greater than the first preset frequency and less than or equal to the second preset frequency, the initial temperature difference is less than the second preset temperature difference, and the second frequency is greater than the first The preset frequency, and less than or equal to the second preset frequency, controls the air conditioner to run in the false defrost mode for a fifth preset duration, and when the air conditioner is in the false defrost mode After the operation time exceeds the fifth preset time period, control the air conditioner to exit the false defrost mode;

If it is determined that the first frequency is greater than the first preset frequency and less than or equal to the second preset frequency, the initial temperature difference is less than the second preset temperature difference, and the second frequency is greater than the The second preset frequency, which is less than or equal to the third preset frequency, controls the air conditioner to run in the false defrost mode for a sixth preset duration, and when the air conditioner operates in the false defrost mode After the operating time in the mode exceeds the sixth preset time, control the air conditioner to exit the false defrost mode;

If it is determined that the first frequency is greater than the first preset frequency and less than or equal to the second preset frequency, the initial temperature difference is less than the second preset temperature difference, and the second frequency is greater than the The third preset frequency controls the air conditioner to run in the false defrost mode for a seventh preset time period, and when the air conditioner runs in the false defrost mode for a time period exceeding the seventh preset time, After a certain period of time, the air conditioner is controlled to exit the false defrost mode; where

The second preset temperature difference is greater than the first preset temperature difference, the fifth preset time length is less than the sixth preset time length, the sixth preset time length is less than the seventh preset time length, and the The preset duration includes the fifth preset duration, the sixth preset duration, and the seventh preset duration.
The air conditioner according to claim 8, wherein after determining the second frequency, the controller is further configured to:

If it is determined that the first frequency is greater than the second preset frequency and less than or equal to the third preset frequency, the initial temperature difference is less than the third preset temperature difference, and the second frequency is greater than the second preset frequency. The preset frequency, and less than or equal to the third preset frequency, controls the air conditioner to run in the false defrost mode for an eighth preset duration, and when the air conditioner is in the false defrost mode After the operation time exceeds the eighth preset time period, control the air conditioner to exit the false defrost mode;

If it is determined that the first frequency is greater than the second preset frequency and less than or equal to the third preset frequency, the initial temperature difference is less than the third preset temperature difference, and the second frequency is greater than the third preset frequency. The preset frequency controls the air conditioner to run in the false defrost mode for a ninth preset time period, and after the air conditioner runs in the false defrost mode for more than the ninth preset time period , controlling the air conditioner to exit the false defrost mode; where

The third preset temperature difference is greater than the second preset temperature difference, the eighth preset time length is less than the ninth preset time length, and the preset time length includes the eighth preset time length and the ninth preset time length. Default duration.
The air conditioner according to claim 1, wherein the indoor unit includes an indoor fan; the operating parameters include the rotation speed of the indoor fan, and the controller is configured to:

When the air conditioner is in the heating mode, obtain the rotation speed of the indoor fan;

If it is determined that the increase value of the rotation speed of the indoor fan within the preset period is greater than the preset rotation speed value, the air conditioner is controlled to enter the false defrost mode.
The air conditioner according to claim 1, wherein the controller satisfies at least one of the following:

After controlling the air conditioner to enter the false defrost mode, the controller is configured to: control that the outdoor ambient temperature does not meet the conditions for the air conditioner to defrost, so as to control the air conditioner not to defrost;

or,

After controlling the air conditioner to exit the false defrost mode, the controller is further configured to: cancel the limit on the outdoor ambient temperature, so as to cancel the air conditioner not performing any operation in the false defrost mode. Defrost restrictions.
A defrost control method for an air conditioner, applied to the controller of the air conditioner, the air conditioner includes an indoor unit and an outdoor unit, the outdoor unit includes a compressor, an outdoor heat exchanger and a first temperature sensor, The first temperature sensor is provided on the outdoor heat exchanger and is configured to detect outdoor ambient temperature. The method includes:

When the air conditioner is in the heating mode, obtain the operating parameters of the air conditioner;

Control the air conditioner to enter the false defrost mode according to the operating parameters;

It is determined that the operating frequency of the compressor when the air conditioner enters the false defrost mode is the first frequency and the outdoor temperature difference when the air conditioner enters the false defrost mode is the initial temperature difference, and the air conditioner is controlled The outdoor temperature difference is the difference between the outdoor ambient temperature and the temperature of the coil in the outdoor heat exchanger;

If it is determined that the operating frequency of the compressor remains unchanged for at least two consecutive preset periods, determine the operating frequency of the compressor at the current moment as the second frequency;

According to the first frequency, the initial temperature difference and the second frequency, the air conditioner is controlled to run in the false defrost mode for a preset time, and when the air conditioner is in the false defrost mode After the operation time exceeds the preset time period, the air conditioner is controlled to exit the false defrost mode.
The defrost control method of an air conditioner according to claim 12, wherein the operating parameter includes the operating frequency of the compressor, and the method includes:

When the air conditioner is in the heating mode, obtain the operating frequency of the compressor;

If it is determined that the increase in the operating frequency of the compressor within the preset period is greater than the preset frequency threshold, the air conditioner is controlled to enter the false defrost mode.
The defrost control method of an air conditioner according to claim 13, wherein the air conditioner is controlled in the false defrost mode according to the first frequency, the initial temperature difference and the second frequency. Run for a preset time, and after the air conditioner operates in the false defrost mode for more than the preset time, control the air conditioner to exit the false defrost mode, including:

If it is determined that the first frequency is less than or equal to the first preset frequency, the initial temperature difference is less than the first preset temperature difference, and the second frequency is less than or equal to the first preset frequency, the air conditioner is controlled to Run the false defrost mode for a first preset time period, and after the air conditioner runs in the false defrost mode for more than the first preset time period, control the air conditioner to exit the false defrost mode. model;

If it is determined that the first frequency is less than or equal to the first preset frequency, the initial temperature difference is less than the first preset temperature difference, and the second frequency is greater than the first preset frequency and less than or equal to The second preset frequency controls the air conditioner to run in the false defrost mode for a second preset time period, and after the air conditioner runs in the false defrost mode for a second preset time period, , controlling the air conditioner to exit the false defrost mode;

If it is determined that the first frequency is less than or equal to the first preset frequency, the initial temperature difference is less than the first preset temperature difference, and the second frequency is greater than the second preset frequency and less than or equal to The third preset frequency controls the air conditioner to run in the false defrost mode for a third preset time period, and after the air conditioner runs in the false defrost mode for a third preset time period, , controlling the air conditioner to exit the false defrost mode;

If it is determined that the first frequency is less than or equal to the first preset frequency, the initial temperature difference is less than the first preset temperature difference, and the second frequency is greater than the third preset frequency, the air conditioner is controlled The air conditioner operates in the false defrost mode for a fourth preset time period, and after the air conditioner operates in the false defrost mode for more than the fourth preset time period, the air conditioner is controlled to exit the false defrost mode. defrost mode; where

The first preset frequency is less than the second preset frequency, the second preset frequency is less than the third preset frequency, the first preset duration is less than the second preset duration, and the The second preset time length is less than the third preset time length, the third preset time length is less than the fourth preset time length, and the preset time length includes the first preset time length, the second preset time length duration, the third preset duration and the fourth preset duration.
The defrost control method of an air conditioner according to claim 14, wherein the air conditioner is controlled in the false defrost mode based on the first frequency, the initial temperature difference and the second frequency. Running for a preset duration, and controlling the air conditioner to exit the pseudo defrost mode after the duration of the air conditioner operating in the pseudo defrost mode exceeds the preset duration, also includes:

If it is determined that the first frequency is greater than the first preset frequency and less than or equal to the second preset frequency, the initial temperature difference is less than the second preset temperature difference, and the second frequency is greater than the first The preset frequency is less than or equal to the second preset frequency, and the air conditioner is controlled to run in the false defrost mode for a fifth preset duration, and when the air conditioner is in the false defrost mode After the operation time exceeds the fifth preset time period, control the air conditioner to exit the false defrost mode;

If it is determined that the first frequency is greater than the first preset frequency and less than or equal to the second preset frequency, the initial temperature difference is less than the second preset temperature difference, and the second frequency is greater than the The second preset frequency is less than or equal to the third preset frequency, and the air conditioner is controlled to run in the false defrost mode for a sixth preset duration, and when the air conditioner is in the false defrost mode, After the operating time in the mode exceeds the sixth preset time, control the air conditioner to exit the false defrost mode;

If it is determined that the first frequency is greater than the first preset frequency and less than or equal to the second preset frequency, the initial temperature difference is less than the second preset temperature difference, and the second frequency is greater than the The third preset frequency controls the air conditioner to run in the false defrost mode for a seventh preset time period, and when the air conditioner runs in the false defrost mode for a time period exceeding the seventh preset time, After a certain period of time, the air conditioner is controlled to exit the false defrost mode; where

The second preset temperature difference is greater than the first preset temperature difference, the fifth preset time length is less than the sixth preset time length, the sixth preset time length is less than the seventh preset time length, and the The preset duration includes the fifth preset duration, the sixth preset duration, and the seventh preset duration.
The defrost control method of an air conditioner according to claim 15, wherein the air conditioner is controlled in the false defrost mode based on the first frequency, the initial temperature difference and the second frequency. Running for a preset duration, and controlling the air conditioner to exit the pseudo defrost mode after the duration of the air conditioner operating in the pseudo defrost mode exceeds the preset duration, also includes:

If it is determined that the first frequency is greater than the second preset frequency and less than or equal to the third preset frequency, the initial temperature difference is less than the third preset temperature difference, and the second frequency is greater than the second The preset frequency is less than or equal to the third preset frequency, and the air conditioner is controlled to run in the false defrost mode for an eighth preset duration, and when the air conditioner is in the false defrost mode After the operation time exceeds the eighth preset time period, control the air conditioner to exit the false defrost mode;

If it is determined that the first frequency is greater than the second preset frequency and less than or equal to the third preset frequency, the initial temperature difference is less than the third preset temperature difference, and the second frequency is greater than the third preset frequency. The preset frequency controls the air conditioner to run in the false defrost mode for a ninth preset time period, and after the air conditioner runs in the false defrost mode for more than the ninth preset time period , controlling the air conditioner to exit the false defrost mode; where

The third preset temperature difference is greater than the second preset temperature difference, the eighth preset time length is less than the ninth preset time length, and the preset time length includes the eighth preset time length and the ninth preset time length. Default duration.
The defrost control method of an air conditioner according to claim 12, wherein the indoor unit includes an indoor heat exchanger and a second temperature sensor, and the second temperature sensor is provided on the indoor heat exchanger and is Configured to detect indoor ambient temperature, the operating parameters include a set temperature and an indoor temperature difference, the indoor temperature difference is the difference between the set temperature and the indoor ambient temperature, the set temperature is the required indoor ambient temperature , the method includes:

When the air conditioner is in the heating mode, obtain the set temperature and the indoor temperature difference;

If it is determined that the increase in the indoor temperature difference within the preset period is greater than the preset temperature difference threshold, the air conditioner is controlled to enter the false defrost mode.
The defrost control method of an air conditioner according to claim 17, wherein the air conditioner is controlled in the false defrost mode based on the first frequency, the initial temperature difference and the second frequency. Run for a preset time, and after the air conditioner operates in the false defrost mode for more than the preset time, control the air conditioner to exit the false defrost mode, including:

If it is determined that the first frequency is less than or equal to the first preset frequency, the initial temperature difference is less than the first preset temperature difference, and the second frequency is less than or equal to the first preset frequency, the air conditioner is controlled to Run the false defrost mode for a first preset time period, and after the air conditioner runs in the false defrost mode for more than the first preset time period, control the air conditioner to exit the false defrost mode. model;

If it is determined that the first frequency is less than or equal to the first preset frequency, the initial temperature difference is less than the first preset frequency. The temperature difference, and the second frequency is greater than the first preset frequency and less than or equal to the second preset frequency, the air conditioner is controlled to run in the false defrost mode for a second preset time period, and the air conditioner is After the operating time of the air conditioner in the false defrost mode exceeds the second preset time length, control the air conditioner to exit the false defrost mode;

If it is determined that the first frequency is less than or equal to the first preset frequency, the initial temperature difference is less than the first preset temperature difference, and the second frequency is greater than the second preset frequency and less than or equal to The third preset frequency controls the air conditioner to run in the false defrost mode for a third preset time period, and after the air conditioner runs in the false defrost mode for a third preset time period, , controlling the air conditioner to exit the false defrost mode;

If it is determined that the first frequency is less than or equal to the first preset frequency, the initial temperature difference is less than the first preset temperature difference, and the second frequency is greater than the third preset frequency, the air conditioner is controlled The air conditioner operates in the false defrost mode for a fourth preset time period, and after the air conditioner operates in the false defrost mode for more than the fourth preset time period, the air conditioner is controlled to exit the false defrost mode. defrost mode; where

The first preset frequency is less than the second preset frequency, the second preset frequency is less than the third preset frequency, the first preset duration is less than the second preset duration, and the The second preset time length is less than the third preset time length, the third preset time length is less than the fourth preset time length, and the preset time length includes the first preset time length, the second preset time length duration, the third preset duration and the fourth preset duration.
The defrost control method of an air conditioner according to claim 18, wherein the air conditioner is controlled in the false defrost mode according to the first frequency, the initial temperature difference and the second frequency. Running for a preset duration, and controlling the air conditioner to exit the pseudo defrost mode after the duration of the air conditioner operating in the pseudo defrost mode exceeds the preset duration, also includes:

If it is determined that the first frequency is greater than the first preset frequency and less than or equal to the second preset frequency, the initial temperature difference is less than the second preset temperature difference, and the second frequency is greater than the first The preset frequency, and less than or equal to the second preset frequency, controls the air conditioner to run in the false defrost mode for a fifth preset duration, and when the air conditioner is in the false defrost mode After the operation time exceeds the fifth preset time period, control the air conditioner to exit the false defrost mode;

If it is determined that the first frequency is greater than the first preset frequency and less than or equal to the second preset frequency, the initial temperature difference is less than the second preset temperature difference, and the second frequency is greater than the The second preset frequency, which is less than or equal to the third preset frequency, controls the air conditioner to run in the false defrost mode for a sixth preset duration, and when the air conditioner operates in the false defrost mode After the operation time in the mode exceeds the sixth preset time period, control the air conditioner to exit the false defrost mode;

If it is determined that the first frequency is greater than the first preset frequency and less than or equal to the second preset frequency, the initial temperature difference is less than the second preset temperature difference, and the second frequency is greater than the The third preset frequency controls the air conditioner to run in the false defrost mode for a seventh preset time period, and when the air conditioner runs in the false defrost mode for a time period exceeding the seventh preset time, After a certain period of time, the air conditioner is controlled to exit the false defrost mode; where

The second preset temperature difference is greater than the first preset temperature difference, the fifth preset time length is less than the sixth preset time length, the sixth preset time length is less than the seventh preset time length, and the The preset duration includes the fifth preset duration, the sixth preset duration, and the seventh preset duration.
The defrost control method of an air conditioner according to claim 19, wherein the air conditioner is controlled in the false defrost mode according to the first frequency, the initial temperature difference and the second frequency. Running for a preset duration, and controlling the air conditioner to exit the pseudo defrost mode after the duration of the air conditioner operating in the pseudo defrost mode exceeds the preset duration, also includes:

If it is determined that the first frequency is greater than the second preset frequency and less than or equal to the third preset frequency, the initial temperature difference is less than the third preset temperature difference, and the second frequency is greater than the second The preset frequency, and less than or equal to the third preset frequency, controls the air conditioner to run in the false defrost mode for an eighth preset duration, and when the air conditioner is in the false defrost mode After the operation time exceeds the eighth preset time period, control the air conditioner to exit the false defrost mode;

If it is determined that the first frequency is greater than the second preset frequency and less than or equal to the third preset frequency, the initial temperature difference is less than the third preset temperature difference, and the second frequency is greater than the third preset frequency. The preset frequency controls the air conditioner to run in the false defrost mode for a ninth preset duration, and the air conditioner runs in the false defrost mode for the duration After the ninth preset time period is exceeded, the air conditioner is controlled to exit the false defrost mode; wherein

The third preset temperature difference is greater than the second preset temperature difference, the eighth preset time length is less than the ninth preset time length, and the preset time length includes the eighth preset time length and the ninth preset time length. Default duration.