CN103307705B - The method and apparatus controlling air-conditioner defrost - Google Patents

Abstract

The invention relates to a method and device for controlling the defrosting of an air conditioner. According to the outdoor ambient temperature and the mapping relationship between the outdoor ambient temperature and the defrosting time interval, the defrosting time interval is obtained. When the running time of the compressor is greater than or equal to the obtained time interval, the air conditioner is controlled to defrost. Since the time interval is fixed, the defrosting start time is more accurate and the defrosting efficiency is high.

Description

Method and device for controlling defrosting of air conditioner

technical field

The invention relates to the technical field of air conditioners, in particular to a method and device for controlling defrosting of an air conditioner.

Background technique

The indoor and outdoor heat exchangers of household air conditioners usually use finned copper tube heat exchangers. In an outdoor environment with low temperature and high humidity, if the air conditioner runs for heating for a long time, it is inevitable that there will be different thicknesses on the surface of the outdoor heat exchanger. Frost will increase the attenuation of heat exchange of the air conditioning system and seriously affect the heat supply to indoor rooms. The existing technology generally judges whether to defrost the outdoor exchanger based on the temperature change of the outdoor evaporator, but the temperature of the evaporator needs to be sensed by the temperature sensing element. If the position of the temperature sensing element is unreasonable, it will be too If the defrosting command is issued too early or too late, the defrosting efficiency will be low.

Contents of the invention

The main purpose of the present invention is to provide a method and device for controlling the defrosting of the air conditioner, so as to improve the defrosting efficiency of the air conditioner.

The present invention proposes a method for controlling defrosting of an air conditioner, including:

Obtain the outdoor ambient temperature in real time or at regular intervals;

According to the mapping relationship between the preset outdoor ambient temperature and the defrosting operation time interval, determine the defrosting time interval corresponding to the obtained outdoor ambient temperature;

Obtain the time interval from the last defrosting end time of the air conditioner to the current time, and when the acquired time interval is greater than or equal to the determined defrosting time interval, control the defrosting of the air conditioner, and record the defrosting of the air conditioner The end time of frost, or start timing from the end of defrosting of the air conditioner.

Preferably, after the step of obtaining the time interval from the last defrosting end time of the air conditioner to the current time, the method includes:

When the acquired time interval is greater than or equal to the determined defrosting time interval, determine the defrosting duration corresponding to the acquired outdoor ambient temperature according to the pre-stored mapping relationship between the outdoor ambient temperature and the defrosting duration;

The air conditioner is controlled to defrost within the determined defrosting duration, and the end time of defrosting of the air conditioner is recorded, or counted from the end of defrosting of the air conditioner.

Preferably, before the step of obtaining the outdoor ambient temperature in real time or at regular intervals, it also includes:

Preset the outdoor temperature threshold, and set multiple continuous temperature ranges below the set outdoor temperature threshold;

Correspondingly set the defrosting time interval, or the defrosting time interval and the defrosting duration, for each set temperature range, generate and save the mapping relationship data between each set temperature range and the defrosting time interval, or set each temperature The mapping relationship data between the interval and the defrosting time interval and defrosting duration.

Preferably, after the step of controlling the air conditioner to perform defrosting within the determined defrosting duration, the step further includes:

Obtain the current of the outdoor fan after defrosting;

When the obtained outdoor fan current after defrosting is less than the outdoor fan current before defrosting, increase the determined defrosting duration by a preset value;

The defrosting duration corresponding to the obtained temperature range of the outdoor ambient temperature is updated to the defrosting duration after the preset value is increased.

Preferably, the step of obtaining the outdoor ambient temperature in real time or at regular intervals includes:

Obtain the current working mode of the air conditioner;

When the current working mode of the air conditioner is the heating mode, the outdoor ambient temperature is acquired in real time or periodically.

The present invention also proposes a device for controlling defrosting of an air conditioner, including:

The detection module is used to obtain the outdoor ambient temperature in real time or at regular intervals;

An acquisition module, configured to determine the defrosting time interval corresponding to the acquired outdoor ambient temperature according to the preset mapping relationship between the outdoor ambient temperature and the defrosting operation time interval;

The timing module is used to obtain the time interval from the last defrosting end time of the air conditioner to the current time;

A control module, configured to control the defrosting of the air conditioner when the acquired time interval is greater than or equal to the determined defrosting time interval, and record the defrosting end time of the air conditioner, or obtain defrosting time from the air conditioner. The timer starts at the end of the frost.

Preferably, the acquiring module is further configured to determine the corresponding outdoor ambient temperature according to the pre-stored mapping relationship between the outdoor ambient temperature and the defrosting duration when the acquired time interval is greater than or equal to the determined defrosting time interval. The defrosting duration; the control module is also used to control the air conditioner to defrost within the determined defrosting duration; the timing module is also used to record the defrosting of the air conditioner after the defrosting ends end time, or start timing from the end of defrosting of the air conditioner.

Preferably, it also includes:

The setting module is used to preset the outdoor temperature threshold, set a plurality of continuous temperature intervals below the set outdoor temperature threshold, and set the defrosting time interval or defrosting time for each set temperature interval Interval and defrost duration;

The storage module is used to generate and save the mapping relationship data between the set temperature ranges and the defrosting time interval, or the mapping relationship data between the setting temperature ranges, the defrosting time interval and the defrosting duration.

Preferably, the detection module is also used to obtain the current of the outdoor fan after defrosting; the control module is also used to convert the determined current of the outdoor fan after defrosting to less than the current of the outdoor fan before defrosting. The frost duration is increased by a preset value; the storage module is used to update the defrost duration corresponding to the obtained temperature range of the outdoor ambient temperature to the defrost duration after the preset value is increased.

Preferably, the detection module is also used to obtain the current working mode of the air conditioner, and when the current working mode of the air conditioner is heating mode, obtain the outdoor ambient temperature in real time or periodically.

The method and device for controlling the defrosting of an air conditioner proposed by the present invention obtain the defrosting time interval according to the outdoor ambient temperature and the mapping relationship between the outdoor ambient temperature and the defrosting time interval. When the running time of the air conditioner is greater than or equal to the obtained time interval, control the defrosting of the air conditioner. Since the time interval is fixed, the defrosting start time is more accurate and the defrosting efficiency is high.

Description of drawings

Fig. 1 is the schematic flow chart of the first embodiment of the method for controlling the defrosting of an air conditioner in the present invention;

Fig. 2 is a schematic flow chart of the second embodiment of the method for controlling defrosting of an air conditioner according to the present invention;

Fig. 3 is a schematic flow chart of the third embodiment of the method for controlling defrosting of an air conditioner according to the present invention;

4 is a schematic flow chart of a fourth embodiment of the method for controlling defrosting of an air conditioner according to the present invention;

5 is a schematic flow chart of a fifth embodiment of the method for controlling the defrosting of an air conditioner according to the present invention;

Fig. 6 is a structural schematic diagram of the first embodiment of the device for controlling the defrosting of the air conditioner according to the present invention;

Fig. 7 is a schematic structural view of the second embodiment of the device for controlling the defrosting of the air conditioner according to the present invention;

Fig. 8 is a structural schematic diagram of a third embodiment of the device for controlling defrosting of an air conditioner according to the present invention.

The realization of the purpose of the present invention, functional characteristics and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

detailed description

The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

Referring to FIG. 1 , FIG. 1 is a schematic flowchart of a first embodiment of a method for controlling defrosting of an air conditioner according to the present invention.

This embodiment proposes a method for controlling defrosting of an air conditioner, including:

Step S10, acquiring the outdoor ambient temperature in real time or at regular intervals;

A temperature sensor can be set on the outdoor unit, and the outdoor ambient temperature can be obtained in real time or periodically through the temperature sensor. Timing refers to a preset time interval, and the outdoor ambient temperature is obtained every other time interval. For example, the time interval is 1 minute, and it is obtained every 1 minute. outdoor ambient temperature.

Step S20, according to the preset mapping relationship between the outdoor ambient temperature and the defrosting operation time interval, determine the defrosting time interval corresponding to the acquired outdoor ambient temperature;

An outdoor ambient temperature threshold can be preset. In this embodiment, the temperature threshold is preferably 24 degrees Celsius, and the temperature segment lower than the preset temperature threshold is divided into a plurality of temperature intervals, and corresponding to each temperature Interval presets a defrosting time interval. For example, the preset outdoor ambient temperature thresholds are T1, T2, T3, T4 in descending order, then the defrosting time interval corresponding to the temperature range smaller than T1 is t1, and the defrosting time interval corresponding to the temperature range T1~T2 The time interval is t2, the defrosting time interval corresponding to the T2~T3 temperature range is t3, the defrosting time interval corresponding to the T3~T4 temperature range is t4, and so on, the defrosting time between Tn~the preset temperature threshold The interval is t(n+1). Obtain the outdoor ambient temperature T according to the temperature sensor, determine the temperature range corresponding to the obtained outdoor ambient temperature T, the defrosting time interval corresponding to the temperature range is the defrosting time interval of the outdoor ambient temperature T, for example, the outdoor temperature corresponds to The temperature range is T2~T3, and the corresponding defrosting time interval is t3.

Step S30, obtaining the time interval from the last defrosting end time of the air conditioner to the current time;

Step S40, when the acquired time interval is greater than or equal to the determined defrosting time interval, control the defrosting of the air conditioner, and record the defrosting end time of the air conditioner, or the defrosting end time of the air conditioner start timing.

When the defrosting operation has not been performed after the air conditioner is turned on, the last defrosting end time is the start time of the air conditioner, and the running time of the compressor is obtained, which is the time interval in step S30. When the air conditioner has been defrosted after it is turned on, the timer can be counted after the last defrost of the air conditioner, and the running time of the air conditioner from the last defrost to the current compressor can be obtained, or the last defrost can be recorded and obtain the current time, and then subtract the last defrost end time from the current time to obtain the running time of the air conditioner from the last defrost end to the current compressor. When the acquired compressor running time (i.e. the time interval in step S30) is greater than or equal to the preset defrosting time interval, control the defrosting of the air conditioner, and record the defrosting stop time of the air conditioner, so that the next time The running time of the compressor is calculated, and when the obtained running time of the compressor is less than the determined defrosting time interval, the running time of the compressor is continuously obtained or the outdoor ambient temperature is obtained.

The method for controlling the defrosting of the air conditioner proposed in this embodiment obtains the defrosting time interval according to the outdoor ambient temperature and the mapping relationship between the outdoor ambient temperature and the defrosting time interval. When the running time is greater than or equal to the obtained time interval, the air conditioner is controlled to defrost. Since the time interval is fixed, the defrosting start time is more accurate and the defrosting efficiency is high.

Referring to FIG. 2 , FIG. 2 is a schematic flowchart of a second embodiment of a method for controlling defrosting of an air conditioner according to the present invention.

Based on the first embodiment, the second embodiment of the method for controlling the defrosting of the air conditioner of the present invention is proposed. In this embodiment, steps S50 and S60 are included after step S30, wherein:

Step S50, when the acquired time interval is greater than or equal to the determined defrosting time interval, determine the defrosting duration corresponding to the acquired outdoor ambient temperature according to the pre-stored mapping relationship between the outdoor ambient temperature and the defrosting duration;

Step S60, controlling the air conditioner to perform defrosting within the determined defrosting duration, and recording the end time of defrosting of the air conditioner, or timing from the end of defrosting of the air conditioner.

The frosting degree of the air conditioner is related to the outdoor ambient temperature. Different outdoor ambient temperatures correspond to different frosting degrees. You can preset an outdoor ambient temperature threshold, and divide the temperature range below the outdoor ambient temperature threshold into Multiple continuous temperature ranges, different temperature ranges correspond to different defrosting durations, the process of determining the defrosting duration is the same as the process of determining the defrosting time interval, and will not be repeated here. When the acquired running time of the compressor is greater than or equal to the defrosting time interval, the air conditioner is controlled to perform defrosting within the determined defrosting duration.

Set different defrosting durations for different temperature ranges, so that the defrosting effect of the air conditioner is better, and avoid defrosting when the outdoor ambient temperature is low, or when the outdoor ambient temperature is high. waste.

Referring to FIG. 3 , FIG. 3 is a schematic flowchart of a third embodiment of a method for controlling defrosting of an air conditioner according to the present invention.

Based on the second embodiment, the third embodiment of the method for controlling the defrosting of the air conditioner is proposed. In this embodiment, before step S10, it also includes:

Step S70, preset the outdoor temperature threshold, and set a plurality of continuous temperature ranges below the set outdoor temperature threshold;

Step S80, correspondingly setting defrosting time intervals, or defrosting time intervals and defrosting durations, for each set temperature range;

Step S90, generating and saving the mapping relationship data between the set temperature ranges and the defrosting time interval, or the mapping relationship data between the setting temperature ranges, the defrosting time interval and the defrosting duration

An outdoor ambient temperature threshold can be preset. When the outdoor ambient temperature is less than or equal to the outdoor ambient temperature threshold, the air conditioner will defrost. When the outdoor ambient temperature is greater than the threshold, the defrost operation will not be performed. Continue to obtain the outdoor ambient temperature. Divide the temperature segment below the outdoor ambient temperature threshold into multiple continuous temperature intervals, and set a defrosting time interval corresponding to each temperature interval to generate a mapping relationship between the defrosting time interval and the temperature interval, and the defrosting duration As a fixed value, when the defrosting time interval is equal to the running time of the compressor, it will defrost within the preset defrosting duration; or set the defrosting time interval and defrosting duration correspondingly for each temperature range to generate the defrosting time interval According to the mapping relationship between the defrosting duration and the temperature range, when the defrosting time interval is equal to the running time of the compressor, the air conditioner is controlled to defrost within the defrosting duration corresponding to the obtained outdoor ambient temperature. Steps S60 to S80 are not executed every time, but only once, or when the mapping relationship between the temperature range and the defrosting time interval or the temperature range and the defrosting time interval or the defrosting duration needs to be changed.

Referring to FIG. 4 , FIG. 4 is a schematic flowchart of a fourth embodiment of a method for controlling defrosting of an air conditioner according to the present invention.

Based on the third embodiment, the fourth embodiment of the method for controlling the defrosting of the air conditioner of the present invention is proposed. In this embodiment, after step S60, it also includes:

Step S100, obtaining the current of the outdoor fan after defrosting;

Step S110, judging whether the acquired current of the outdoor fan after defrosting is smaller than the current of the outdoor fan before defrosting;

When the obtained outdoor fan current after defrosting is greater than or equal to the outdoor fan current before defrosting, perform step S10 to obtain the outdoor ambient temperature in real time or periodically;

Step S120, when the obtained outdoor fan current after defrosting is smaller than the outdoor fan current before defrosting, increase the determined defrosting duration by a preset value;

Step S130 , updating the defrosting duration corresponding to the acquired temperature range of the outdoor ambient temperature to the defrosting duration after adding the preset value; and then returning to step S10 .

The current of the outdoor fan is related to the frosting degree of the air conditioner. When there is frost on the outdoor heat exchanger, the air volume of the outdoor fan is small, and the corresponding current is relatively small. After the defrosting is completed, the air volume of the outdoor fan is large, and the load is relatively small. The corresponding current is also relatively large. After defrosting is completed, obtain the current of the outdoor fan. If the current of the outdoor fan is lower than the current of the outdoor fan before defrosting, it means that the defrosting has not been completely removed. You can increase the defrosting duration by a preset value to adjust the defrosting duration. Store the adjusted defrost duration in association with the temperature range corresponding to the defrost duration before adjustment. , then the changed defrosting duration will be used for defrosting in the next defrosting; when the obtained outdoor fan current is greater than or equal to the preset threshold value, it means that the currently set defrosting duration can meet the defrosting requirements, continue The outdoor ambient temperature can be acquired in real time or at regular intervals, so that the defrosting effect of the air conditioner is better.

For example, the preset outdoor ambient temperature thresholds are T1, T2, T3, T4 in descending order, the defrosting duration corresponding to the temperature range less than T1 is tb1, and the defrosting duration corresponding to the temperature range T1~T2 The time is tb2, the defrosting duration corresponding to the T2~T3 temperature range is tb3, the defrosting duration corresponding to the T3~T4 temperature range is tb4, and so on, the temperature range Tn~the preset ambient temperature threshold The corresponding defrosting duration is T(n+1). If the obtained outdoor temperature is within the temperature range T2~T3, control the air conditioner to start defrosting when it reaches t3 after the last defrosting, and the defrosting duration is tb3. After defrosting is completed, if the outdoor fan If the current is less than the preset threshold value, adjust tb3 to tb3′, tb3′= tb3+tb0, tb0 is the preset fixed value, and then continue to obtain the outdoor ambient temperature, when the obtained outdoor ambient temperature is still in T2~T3 In the temperature range, control the air conditioner to defrost within tb3' time.

Referring to FIG. 5 , FIG. 5 is a schematic flowchart of a fifth embodiment of a method for controlling defrosting of an air conditioner according to the present invention.

Based on any of the above-mentioned embodiments, a fifth embodiment of the method for controlling defrosting of an air conditioner according to the present invention is proposed. In this embodiment, step S10 includes:

Step S11, obtaining the current working mode of the air conditioner;

Step S12, when the current working mode of the air conditioner is the heating mode, the outdoor ambient temperature is acquired in real time or periodically.

In winter, when the air conditioner is in the heating mode, due to the low outdoor temperature and high humidity, the heat exchanger is prone to frost, so only in the heating mode, the defrost mode is activated to obtain the outdoor ambient temperature in real time or at regular intervals, without Always run the defrosting mode to save the energy consumption of the air conditioner.

Referring to Fig. 6, Fig. 6 is a structural schematic diagram of the first embodiment of the device for controlling the defrosting of the air conditioner according to the present invention.

This embodiment proposes a device for controlling the defrosting of an air conditioner, including:

Detection module 10, for real-time or regular acquisition of outdoor ambient temperature;

A temperature sensor can be set on the outdoor unit, and the outdoor ambient temperature can be obtained in real time or periodically through the temperature sensor. Timing refers to a preset time interval, and the outdoor ambient temperature is obtained every other time interval. For example, the time interval is 1 minute, and it is obtained every 1 minute. outdoor ambient temperature.

An acquisition module 20, configured to determine the defrosting time interval corresponding to the acquired outdoor ambient temperature according to the preset mapping relationship between the outdoor ambient temperature and the defrosting operation time interval;

An outdoor ambient temperature threshold can be preset. In this embodiment, the temperature threshold is preferably 24 degrees Celsius, and the temperature segment lower than the preset temperature threshold is divided into a plurality of temperature intervals, and corresponding to each temperature Interval presets a defrosting time interval. For example, the preset outdoor ambient temperature thresholds are T1, T2, T3, T4 in descending order, then the defrosting time interval corresponding to the temperature range smaller than T1 is t1, and the defrosting time interval corresponding to the temperature range T1~T2 The time interval is t2, the defrosting time interval corresponding to the T2~T3 temperature range is t3, the defrosting time interval corresponding to the T3~T4 temperature range is t4, and so on, the defrosting time between Tn~the preset temperature threshold The interval is t(n+1). Obtain the outdoor ambient temperature T according to the temperature sensor, determine the temperature range corresponding to the obtained outdoor ambient temperature T, the defrosting time interval corresponding to the temperature range is the defrosting time interval of the outdoor ambient temperature T, for example, the outdoor temperature corresponds to The temperature range is T2~T3, and the corresponding defrosting time interval is t3.

The timing module 30 is used to obtain the time interval from the last defrosting end time of the air conditioner to the current time;

The control module 40 is configured to control the defrosting of the air conditioner when the acquired time interval is greater than or equal to the determined defrosting time interval, and record the defrosting end time of the air conditioner, or obtain Timing starts at the end of defrosting.

When the air conditioner has not been defrosted since it was turned on, the last defrosting end time is the start time of the air conditioner, and the timing module 30 acquires the running time of the compressor, that is, the time interval in step S30. When the defrosting operation has been performed after the air conditioner is turned on, the timing module 30 can perform timing after the last defrosting of the air conditioner, and obtain the running time from the last defrosting of the air conditioner to the current compressor, or the timing module 30 Record the end time of the last defrost and obtain the current time, then subtract the end time of the last defrost from the current time to obtain the running time of the air conditioner from the end of the last defrost to the current compressor. When the running time of the compressor acquired by the timing module 30 (that is, the time interval from the last defrosting end time of the air conditioner to the current time) is greater than or equal to the preset defrosting time interval, the control module 40 controls the air conditioner to defrost, and the defrosting After the completion, the timing module 30 records the defrosting stop time of the air conditioner, so as to calculate the running time of the compressor next time. When the acquired running time of the compressor is less than the determined defrosting time interval, the detection module 10 continues to acquire the running time of the compressor or the outdoor ambient temperature.

The device for controlling the defrosting of the air conditioner proposed in this embodiment obtains the defrosting time interval according to the outdoor ambient temperature and the mapping relationship between the outdoor ambient temperature and the defrosting time interval. When the running time is greater than or equal to the obtained time interval, the air conditioner is controlled to defrost. Since the time interval is fixed, the defrosting start time is more accurate and the defrosting efficiency is high.

In the first embodiment, the obtaining module 20 is also used to determine the defrosting time interval according to the pre-stored mapping relationship between the outdoor ambient temperature and the defrosting duration when the time interval obtained by the timing module 30 is greater than or equal to the determined defrosting time interval. The acquired defrosting duration corresponding to the outdoor ambient temperature; then the control module 40 controls the air conditioner to defrost within the determined defrosting duration. After defrosting ends, the timing module 30 records the defrosting end time of the air conditioner, or starts timing from the end of defrosting of the air conditioner.

The frosting degree of the air conditioner is related to the outdoor ambient temperature. Different outdoor ambient temperatures correspond to different frosting degrees. Multiple outdoor ambient temperature thresholds can be preset. Each outdoor ambient temperature corresponds to two temperature ranges. The temperature ranges correspond to different defrosting durations, and the process of determining the defrosting duration is the same as that of determining the defrosting time interval, and will not be repeated here. When the obtained running time of the compressor is greater than or equal to the defrosting time interval, the air conditioner is controlled to perform defrosting within the determined defrosting duration.

Set different defrosting durations for different temperature ranges, so that the defrosting effect of the air conditioner is better, and avoid defrosting when the outdoor ambient temperature is low, or when the outdoor ambient temperature is high. waste.

Referring to Fig. 7, Fig. 7 is a structural schematic diagram of the second embodiment of the device for controlling the defrosting of the air conditioner according to the present invention.

Based on the first embodiment, the second embodiment of the device for controlling the defrosting of the air conditioner of the present invention is proposed, which also includes in this embodiment:

The setting module 50 is used to preset the outdoor temperature threshold, set a plurality of continuous temperature intervals below the set outdoor temperature threshold, and set the defrosting time interval for each set temperature interval, or defrost Time interval and duration of defrosting;

The storage module 60 is used to generate and save the mapping relationship data between the set temperature ranges and the defrosting time interval, or the mapping relationship data between the setting temperature ranges, the defrosting time interval and the defrosting duration.

An outdoor ambient temperature threshold can be preset. When the outdoor ambient temperature is less than or equal to the outdoor ambient temperature threshold, the air conditioner will defrost. When the outdoor ambient temperature is greater than the threshold, the defrost operation will not be performed. Continue to obtain the outdoor ambient temperature. Divide the temperature segment below the outdoor ambient temperature threshold into multiple continuous temperature intervals, and set a defrosting time interval corresponding to each temperature interval to generate a mapping relationship between the defrosting time interval and the temperature interval, and the defrosting duration As a fixed value, when the defrosting time interval is equal to the running time of the compressor, it will defrost within the preset defrosting duration; or set the defrosting time interval and defrosting duration correspondingly for each temperature range to generate the defrosting time interval According to the mapping relationship between the defrosting duration and the temperature range, when the defrosting time interval is equal to the running time of the compressor, the air conditioner is controlled to defrost within the defrosting duration corresponding to the obtained outdoor ambient temperature.

Referring to FIG. 8 , FIG. 8 is a structural schematic diagram of a third embodiment of an apparatus for controlling defrosting of an air conditioner according to the present invention.

Based on the first embodiment, the second embodiment of the device for controlling the defrosting of the air conditioner of the present invention is proposed. In this embodiment, the detection module 10 is also used to obtain the current of the outdoor fan before and after defrosting; the control module 40 is also used for when When the acquired outdoor fan current is less than the outdoor fan current before defrosting, increase the determined defrosting duration by a preset value; the storage module 60 is used to store the defrosting duration corresponding to the temperature range where the acquired outdoor ambient temperature is located. Updated to increase defrost duration after preset value.

The current of the outdoor fan is related to the frosting degree of the air conditioner. When there is frost on the outdoor heat exchanger, the air volume of the outdoor fan is small, and the corresponding current is relatively small. After the defrosting is completed, the air volume of the outdoor fan is large, and the load is relatively small. The corresponding current is also relatively large. After defrosting is completed, obtain the current of the outdoor fan. If the current of the outdoor fan is less than the current of the outdoor fan before defrosting, it means that the defrosting has not been completely removed. You can increase the defrosting duration by a preset value to adjust the defrosting duration , store the adjusted defrost duration in association with the temperature range corresponding to the defrost duration before adjustment, and the temperature range of the outdoor ambient temperature to be acquired next time corresponds to the temperature range corresponding to the changed defrost duration At the same time, the changed defrosting duration will be used for defrosting next time. When the obtained outdoor fan current is greater than or equal to the preset threshold value, continue to obtain the outdoor ambient temperature in real time or regularly, so that the defrosting of the air conditioner Better results.

For example, for example, the preset outdoor ambient temperature thresholds are T1, T2, T3, T4 in descending order, the defrosting duration corresponding to the temperature range less than T1 is tb1, and the defrosting duration corresponding to the temperature range T1~T2 The frost duration is tb2, the defrost duration corresponding to the T2~T3 temperature range is tb3, the defrost duration corresponding to the T3~T4 temperature range is tb4, and so on, Tn~the preset ambient temperature threshold The defrosting duration corresponding to the temperature range is T(n+1). If the obtained outdoor temperature is within the temperature range T2~T3, control the air conditioner to start defrosting when it reaches t3 after the last defrosting, and the defrosting duration is tb3. After defrosting is completed, if the outdoor fan If the current is less than the preset threshold value, adjust tb3 to tb3′, tb3′=tb3+tb0, tb0 is the preset fixed value, and then continue to obtain the outdoor ambient temperature. When the obtained outdoor ambient temperature is still at T2~T3 temperature In the interval, control the air conditioner to defrost within tb3' time.

In the third embodiment, the detection module 10 is also used to obtain the current working mode of the air conditioner, and when the current working mode of the air conditioner is the heating mode, obtain the outdoor ambient temperature in real time or periodically.

In winter, when the air conditioner is in the heating mode, due to the low outdoor temperature and high humidity, the heat exchanger is prone to frost, so only in the heating mode, the defrost mode is activated to obtain the outdoor ambient temperature in real time or at regular intervals, without Always run the defrosting mode to save the energy consumption of the air conditioner.

The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural transformations made by using the description of the present invention and the contents of the accompanying drawings, or directly or indirectly used in other related technical fields, are all The same reasoning is included in the patent protection scope of the present invention.

Claims (10)

1. A method for controlling air conditioner defrosting, characterized in that, comprising: Obtain the outdoor ambient temperature in real time or at regular intervals; According to the mapping relationship between the preset outdoor ambient temperature and the defrosting operation time interval, determine the defrosting time interval corresponding to the acquired outdoor ambient temperature; Obtain the time interval from the last defrosting end time of the air conditioner to the current time, and when the acquired time interval is greater than or equal to the determined defrosting time interval, control the defrosting of the air conditioner, and record the defrosting of the air conditioner The frost end time, or counting from the end of the defrosting of the air conditioner, wherein, when the obtained compressor running time is less than the determined defrosting time interval, continue to obtain the compressor running time or obtain the outdoor ambient temperature. 2. The method according to claim 1, characterized in that, after the step of obtaining the time interval from the last defrosting end time of the air conditioner to the current time, the method comprises: When the acquired time interval is greater than or equal to the determined defrosting time interval, determine the defrosting duration corresponding to the acquired outdoor ambient temperature according to the pre-stored mapping relationship between the outdoor ambient temperature and the defrosting duration; The air conditioner is controlled to defrost within the determined defrosting duration, and the end time of defrosting of the air conditioner is recorded, or counted from the end of defrosting of the air conditioner. 3. The method according to claim 2, characterized in that, before the step of obtaining the outdoor ambient temperature in real time or regularly, it also includes: Preset the outdoor temperature threshold, and set multiple continuous temperature ranges below the set outdoor temperature threshold; Set the defrosting time interval, or the defrosting time interval and defrosting duration, for each set temperature range; Generate and save the mapping relationship data between the set temperature ranges and the defrosting time interval, or the mapping relationship data between the setting temperature ranges, the defrosting time interval and the defrosting duration. 4. The method according to claim 3, characterized in that, after the step of controlling the air conditioner to perform defrosting within the determined defrosting duration, it further comprises: Obtain the current of the outdoor fan after defrosting; When the obtained outdoor fan current after defrosting is less than the outdoor fan current before defrosting, increase the determined defrosting duration by a preset value; The defrosting duration corresponding to the obtained temperature range of the outdoor ambient temperature is updated to the defrosting duration after the preset value is increased. 5. The method according to claim 1, wherein the step of obtaining the outdoor ambient temperature in real time or regularly comprises: Obtain the current working mode of the air conditioner; When the current working mode of the air conditioner is the heating mode, the outdoor ambient temperature is acquired in real time or periodically. 6. A device for controlling the defrosting of an air conditioner, comprising: The detection module is used to obtain the outdoor ambient temperature in real time or at regular intervals; An acquisition module, configured to determine the defrosting time interval corresponding to the acquired outdoor ambient temperature according to the preset mapping relationship between the outdoor ambient temperature and the defrosting operation time interval; The timing module is used to obtain the time interval from the last defrosting end time of the air conditioner to the current time; A control module, configured to control the defrosting of the air conditioner when the acquired time interval is greater than or equal to the determined defrosting time interval, and record the defrosting end time of the air conditioner, or obtain defrosting time from the air conditioner. Timing starts at the end of frost, and when the acquired running time of the compressor is less than the determined defrosting time interval, continue to acquire the running time of the compressor or acquire the outdoor ambient temperature. 7. The device according to claim 6, wherein the acquiring module is further configured to, when the acquired time interval is greater than or equal to the determined defrosting time interval, according to the pre-stored outdoor ambient temperature and defrosting duration Mapping relationship to determine the defrosting duration corresponding to the acquired outdoor ambient temperature; the control module is also used to control the air conditioner to defrost within the determined defrosting duration; the timing module is also used to defrost Record the end time of defrosting of the air conditioner after the end of frost, or count the time from the end of defrosting of the air conditioner. 8. The device according to claim 7, further comprising: The setting module is used to preset the outdoor temperature threshold, set a plurality of continuous temperature intervals below the set outdoor temperature threshold, and set the defrosting time interval or defrosting time for each set temperature interval Interval and defrost duration; The storage module is used to generate and save the mapping relationship data between the set temperature ranges and the defrosting time interval, or the mapping relationship data between the setting temperature ranges, the defrosting time interval and the defrosting duration. 9. The device according to claim 8, wherein the detection module is also used to obtain the current of the outdoor fan after defrosting; the control module is also used to obtain the current of the outdoor fan after defrosting is less than When the current of the outdoor fan before frost, increase the determined defrosting duration by a preset value; the storage module is used to update the defrosting duration corresponding to the temperature range where the acquired outdoor ambient temperature is after increasing the preset value defrost duration. 10. The device according to claim 9, wherein the detection module is also used to obtain the current working mode of the air conditioner, and when the current working mode of the air conditioner is heating mode, real-time or Obtain the outdoor ambient temperature regularly.