CN110410939A - A control method and system for defrosting an air conditioner external unit, and an air conditioner - Google Patents

Abstract

A control method, system, and air conditioner for defrosting an external unit of an air conditioner. The control method includes: obtaining real-time weather conditions, humidity, external environment temperature, and external coil temperature in a heating mode; according to the real-time weather conditions, humidity, The external environment temperature and the temperature of the external coil can judge whether to enter the defrosting; and after entering the defrosting, judge whether the defrosting exit condition is met, and exit the defrosting control in time. The optimal control of defrosting is realized by adding judging factors related to weather conditions and humidity, and it still has a good heating effect in the case of high air humidity.

Description

A control method and system for defrosting an air conditioner external unit, and an air conditioner

technical field

The present invention relates to the technical field of air conditioners, in particular, to a control method and system for defrosting an external unit of an air conditioner, and an air conditioner.

Background technique

When the air conditioner is heating in winter, because the outdoor heat exchanger absorbs heat from the outdoor air, the temperature around the outdoor heat exchanger is low, and the water vapor in the air will condense into frost and adhere to the surface of the outdoor heat exchanger. If the frost is not defrosted in time, the attached frost will affect the heat exchange capacity of the outdoor heat exchanger, which will reduce the heating capacity of the air conditioner and affect people's comfort.

The existing air-conditioning outdoor unit mainly detects the outdoor ambient temperature and the temperature of the external disk through the temperature sensor, judges whether the external ambient temperature is lower than a certain threshold value, and controls to enter the defrosting mode.

Contents of the invention

The problem at least solved by the present invention is: in the case of high air humidity, such as rainy or foggy days, frosting on the condenser in heating operation will be more serious, which cannot be realized only by judging the temperature of the external environment Better defrosting and heating effect.

In order to solve the above problems, the present invention provides a control method, system and air conditioner for defrosting the external unit of the air conditioner.

According to one aspect of the present invention, a method for controlling defrosting of an external unit of an air conditioner is provided, including: obtaining real-time weather conditions, humidity, external environment temperature, and external coil temperature in heating mode; according to the real-time weather conditions, Humidity, external ambient temperature and external coil temperature determine whether to enter defrosting; and after entering defrosting, determine whether defrosting exit conditions are met, and exit defrosting control in time.

By judging whether to enter defrosting according to real-time weather conditions, humidity, external ambient temperature and external coil temperature, factors related to weather conditions and humidity are added to the defrosting conditions, which helps to take corresponding measures in rainy days with high humidity. Defrost judging conditions (low limit defrosting conditions) to facilitate timely defrosting, so as to avoid the problem of serious frosting on the condenser during heating operation due to high humidity and untimely defrosting; when the humidity is relatively low In the case of frosting, since the situation corresponding to frosting is not very serious, stricter defrosting judgment conditions (high limit defrosting conditions) are adopted to re-enter defrosting at an appropriate (necessary) time, corresponding to different weather conditions , Humidity, different degrees of defrosting condition prediction, and then based on the external ambient temperature and the temperature of the external coil, according to the threshold conditions under different requirements to determine whether to enter the defrosting and exit the defrosting, by adding the judgment factors related to weather conditions and humidity For the optimized control of defrosting, it still has a good heating effect in the case of high air humidity.

Further, the method of judging whether to enter defrosting according to the real-time weather conditions, humidity, external environment temperature and external coil temperature includes:

Judging whether the current weather conditions and humidity meet the conditions of rain and humidity greater than the first threshold;

If the current weather conditions meet the conditions of rain and humidity greater than the first threshold, then judge whether to meet the low limit defrosting condition and determine whether to enter the defrosting, the low limit defrosting condition is one of the following two conditions, either When the conditions are met, the defrosting will start: condition 1, the external environment temperature is less than or equal to the second threshold and the temperature of the external coil is less than the third threshold for the third consecutive time; condition 2, the external environment temperature is greater than the second threshold and continuously The temperature of the outer coil tube is less than the fourth threshold at the fourth time;

If the current weather conditions do not meet the conditions of rain and humidity greater than the first threshold, then judge whether to meet the high limit defrosting condition and determine whether to enter the defrosting, the high limit defrosting condition is one of the following two conditions, either When two conditions are met, the defrosting starts: condition three, the external environment temperature is less than or equal to the second threshold and the temperature of the external coil is less than the fifth threshold for the fifth consecutive time; condition four, the external environment temperature is greater than the second threshold and The temperature of the outer coil is less than a sixth threshold for a sixth consecutive time;

Wherein, said fourth threshold<third threshold<0, said fourth time>third time; said sixth threshold<fifth threshold<0, said fifth time>sixth time; said fifth The threshold<the third threshold, the fifth time>the third time; the sixth threshold<the fourth threshold, the sixth time>the fourth time.

In this embodiment, it is first judged whether the current weather conditions and humidity meet the conditions of rain and humidity greater than the first threshold (for example, 80%), and further enter the low limit defrosting condition or high limit defrosting condition on the premise of the above judgment result. In the case of rain and humidity greater than 80%, it is necessary to enter the low limit defrosting condition in order to enter defrosting in time. In the case of rain and humidity greater than 80%, the corresponding The air humidity is relatively small. At this time, because the situation corresponding to frost is not very serious, a relatively strict high-limit defrosting condition is adopted to re-enter defrosting at an appropriate (necessary) time. High-limit defrosting conditions and low-limit defrosting conditions The defrosting conditions are judged by the external ambient temperature and the external coil temperature. The difference between the two is that the judgment threshold is set differently. The high limit defrosting condition has a lower threshold temperature than the lower limit defrosting condition. , and the internal and external coil temperature will be lower than the threshold temperature for a long period of time to enter the defrosting, which helps to enter the defrosting in time when the humidity is high, and when the humidity is relatively low Enter defrosting to achieve good heating effect.

Further, the defrosting exit condition is one of the following conditions. If any one of the conditions is satisfied, the defrosting will be exited: the temperature of the external coil is greater than the set temperature after the first set time; or, the continuous defrosting time is greater than A second set duration, wherein the set temperature is greater than zero, and the first set duration is less than the second set duration.

In this embodiment, the first set duration is, for example, 2-4 minutes, the set temperature is, for example, 4° C.-6° C., and the second set duration is, for example, 8-10 minutes.

Further, the conditions for entering defrosting are different, and the corresponding exiting conditions for defrosting are different. When the condition is met and entering defrosting, the corresponding exiting condition for defrosting is: the temperature of the outer coil is greater than the first Seven temperatures, or, the continuous defrosting time is greater than the eighth time; when the second condition is met to enter the defrosting, the corresponding defrosting exit condition is: the outer coil temperature is greater than the ninth temperature after the ninth time, or , the continuous defrosting time is greater than the eighth time; when the third condition is satisfied and the defrosting is entered, the corresponding defrosting exit condition is: the temperature of the outer coil is greater than the seventh temperature after the tenth time, or continuous defrosting The time is greater than the eleventh time; when the fourth condition is satisfied and the defrosting is entered, the corresponding defrosting exit condition is: the temperature of the external coil is greater than the ninth temperature after the twelfth time, or the continuous defrosting time is greater than An eleventh time; wherein, the seventh temperature<the ninth temperature, the seventh time>the ninth time, the tenth time>the twelfth time, and the eighth time>the eleventh time.

By corresponding to different defrost exit conditions under different entry defrost conditions, based on the current weather conditions and humidity and the timeliness of corresponding defrost, the exit defrost conditions are set according to the following principles: for low limit defrost conditions, the correspondence is more stringent Defrost exit conditions (for example, the eighth time is 10 minutes), so that in each defrost control cycle, corresponding to the high humidity can achieve timely and sufficient defrosting; for high limit defrosting conditions corresponding to Loose defrosting exit conditions (for example, corresponding to the eleventh time is 8 minutes), so that in each defrosting control cycle, corresponding to the relatively low humidity and not too severe frosting, avoid resource occupation time too long, The necessary defrosting can be achieved.

Further, the first threshold is 75%-85%.

Further, the eighth time is 9-10 minutes, such as 10 minutes, and the eleventh time is 7-8 minutes, such as 8 minutes.

According to another aspect of the present invention, there is provided a control system for defrosting an air conditioner external unit, including: a weather acquisition module, used to acquire real-time weather conditions; a temperature detection module, used to acquire real-time external ambient temperature and external coil temperature The humidity detection module is used to obtain real-time humidity; the judgment module is used to judge whether to enter defrosting according to the real-time weather conditions, humidity, external environment temperature and external coil temperature, and to determine whether defrosting is satisfied after entering defrosting. a frost exit condition; and a defrost control module, configured to enter the defrost control or exit the defrost control according to the judgment result of the judgment module.

According to yet another aspect of the present invention, a control system for defrosting an external air conditioner is provided, which is used in any one of the control methods mentioned in the present invention.

According to still another aspect of the present invention, an air conditioner is provided, including any one of the control systems mentioned in the present invention.

Further, a temperature and humidity sensor is provided on the back of the condenser of the external unit of the air conditioner, which is used to obtain the real-time external environment temperature and humidity at the same time; an external disk temperature sensor is provided at the bottom of the condenser of the external unit, which is used to obtain the temperature of the external coil; The GPRS module of the air conditioner is used to obtain real-time weather conditions.

The control system and the air conditioner help to adopt the corresponding defrosting judgment conditions (low limit defrosting conditions) in the case of rainy days and high humidity by adding factors related to weather conditions and humidity in the defrosting conditions to facilitate timely defrosting. Enter defrosting to avoid the problem of severe frosting on the condenser during heating operation caused by high humidity and untimely defrosting; in the case of relatively low humidity, stricter defrosting judgment conditions (high limit Defrost conditions) to enter defrosting at a suitable (necessary) time, and to predict different degrees of defrosting conditions corresponding to different weather conditions and humidity, and then based on the external ambient temperature and external coil temperature, according to different requirements The threshold condition determines whether to enter defrosting and exit defrosting. By adding judgment factors related to weather conditions and humidity, the optimal control of defrosting is realized. It still has a good heating effect in the case of high air humidity.

Description of drawings

Fig. 1 is a flow chart of a control method for defrosting an air conditioner outdoor unit according to an embodiment of the present invention;

Fig. 2 is the specific embodiment of each step corresponding to the flowchart shown in Fig. 1;

Fig. 3 is a block diagram of a control system for defrosting an external unit of an air conditioner according to an embodiment of the present invention.

Explanation of reference signs:

3 - Control system;

31-weather acquisition module; 32-temperature detection module;

33-humidity detection module; 34-judgment module;

35 - Defrost control module.

Detailed ways

In order to make the above objects, features and advantages of the present invention more comprehensible, specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

first embodiment

In a first exemplary embodiment of the present invention, a method for controlling defrosting of an external unit of an air conditioner is provided.

Fig. 1 is a flow chart of a control method for defrosting an air conditioner outdoor unit according to an embodiment of the present invention; Fig. 2 is a specific implementation of each step corresponding to the flow chart shown in Fig. 1 .

Referring to Fig. 1 and Fig. 2, the control method for defrosting of the air-conditioning external unit of the present invention includes:

Step S11: In the heating mode, obtain real-time weather conditions, humidity, external ambient temperature and external coil temperature;

In this embodiment, a temperature and humidity sensor is provided on the back of the condenser of the external unit of the air conditioner for simultaneously obtaining real-time external ambient temperature and humidity; an external disk temperature sensor is provided at the bottom of the condenser of the external unit for obtaining the temperature of the external coil; The GPRS module of the air conditioner is used as a weather acquisition module for acquiring real-time weather conditions.

In other embodiments, there may be other devices or modules capable of realizing the above-mentioned functions. Multiple devices or modules may be integrated into the same module to realize multiple functions, or multiple sub-modules may jointly realize one function.

Step S12: judging whether to enter defrosting according to the real-time weather conditions, humidity, external environment temperature and external coil temperature;

Further, the method of judging whether to enter defrosting according to the real-time weather conditions, humidity, external environment temperature and external coil temperature includes:

Judging whether the current weather conditions and humidity meet the conditions of rain and humidity greater than the first threshold;

If the current weather conditions meet the conditions of rain and humidity greater than the first threshold, then judge whether to meet the low limit defrosting condition and determine whether to enter the defrosting, the low limit defrosting condition is one of the following two conditions, either When the conditions are met, the defrosting will start: condition 1, the external environment temperature is less than or equal to the second threshold and the temperature of the external coil is less than the third threshold for the third consecutive time; condition 2, the external environment temperature is greater than the second threshold and continuously The temperature of the outer coil tube is less than the fourth threshold at the fourth time;

If the current weather conditions do not meet the conditions of rain and humidity greater than the first threshold, then judge whether to meet the high limit defrosting condition and determine whether to enter the defrosting, the high limit defrosting condition is one of the following two conditions, either When two conditions are met, the defrosting starts: condition three, the external environment temperature is less than or equal to the second threshold and the temperature of the external coil is less than the fifth threshold for the fifth consecutive time; condition four, the external environment temperature is greater than the second threshold and The temperature of the outer coil is less than a sixth threshold for a sixth consecutive time;

Wherein, said fourth threshold<third threshold<0, said fourth time>third time; said sixth threshold<fifth threshold<0, said fifth time>sixth time; said fifth The threshold<the third threshold, the fifth time>the third time; the sixth threshold<the fourth threshold, the sixth time>the fourth time.

Specifically, in one embodiment, as shown in FIG. 2 , the first threshold is 75% to 85%, for example, 80%, the second threshold is 0°C, the third time is 35 minutes, and the The third threshold is -10°C, the fourth time is 45 minutes, and the fourth threshold is -15°C. If in the heating mode, the current weather is rainy and the air humidity is >80%, it is judged whether the low limit is met or not. Frost condition, the low-limit defrosting condition is: judge the external ambient temperature Tao and the external coil temperature Tdp, if the external ambient temperature Tao≤0°C, and the external coil temperature Tdp<-10°C for 35 minutes, enter the defrosting Frost; if the ambient temperature Tao > 0°C and the external coil temperature Tdp < -15°C for 45 minutes, enter defrosting. In this example, the corresponding fifth time is 70 minutes, the fifth threshold is -15°C, the sixth time is 60 minutes, and the sixth threshold is -20°C. If in the heating mode, the current weather If it is rainy at the same time as the humidity is not satisfied and the air humidity is > 80%, it is judged whether the high limit defrosting condition is met. The high limit defrosting condition is: if the external ambient temperature Tao≤0℃, and the external coil temperature Tdp< -15°C, enter defrosting; if the ambient temperature Tao>0°C, and the external coil temperature Tdp<-20°C for 60 minutes, enter defrosting.

In this embodiment, it is first judged whether the current weather conditions and humidity meet the conditions of rain and humidity greater than the first threshold (for example, 80%), and further enter the low limit defrosting condition or high limit defrosting condition on the premise of the above judgment result. In the case of rain and humidity greater than 80%, it is necessary to enter the low limit defrosting condition in order to enter defrosting in time. In the case of rain and humidity greater than 80%, the corresponding The air humidity is relatively small. At this time, because the situation corresponding to frost is not very serious, a relatively strict high-limit defrosting condition is adopted to re-enter defrosting at an appropriate (necessary) time. High-limit defrosting conditions and low-limit defrosting conditions The defrosting conditions are judged by the external ambient temperature and the external coil temperature. The difference between the two is that the judgment threshold is set differently. The high limit defrosting condition has a lower threshold temperature than the lower limit defrosting condition. , and the internal and external coil temperature will be lower than the threshold temperature for a long period of time to enter the defrosting, which helps to enter the defrosting in time when the humidity is high, and when the humidity is relatively low Enter defrosting to achieve good heating effect.

Step S13: After entering the defrosting, determine whether the defrosting exit condition is met, and exit the defrosting control in time;

Further, the defrosting exit condition is one of the following conditions. If any one of the conditions is satisfied, the defrosting will be exited: the temperature of the external coil is greater than the set temperature after the first set time; or, the continuous defrosting time is greater than A second set duration, wherein the set temperature is greater than zero, and the first set duration is less than the second set duration.

In this embodiment, the first set duration is, for example, 2-4 minutes, the set temperature is, for example, 4° C.-6° C., and the second set duration is, for example, 8-10 minutes.

Further, the conditions for entering defrosting are different, and the corresponding exiting conditions for defrosting are different. When the condition is met and entering defrosting, the corresponding exiting condition for defrosting is: the temperature of the outer coil is greater than the first Seven temperatures, or, the continuous defrosting time is greater than the eighth time; when the second condition is met to enter the defrosting, the corresponding defrosting exit condition is: the outer coil temperature is greater than the ninth temperature after the ninth time, or , the continuous defrosting time is greater than the eighth time; when the third condition is satisfied and the defrosting is entered, the corresponding defrosting exit condition is: the temperature of the outer coil is greater than the seventh temperature after the tenth time, or continuous defrosting The time is greater than the eleventh time; when the fourth condition is satisfied and the defrosting is entered, the corresponding defrosting exit condition is: the temperature of the external coil is greater than the ninth temperature after the twelfth time, or the continuous defrosting time is greater than An eleventh time; wherein, the seventh temperature<the ninth temperature, the seventh time>the ninth time, the tenth time>the twelfth time, and the eighth time>the eleventh time.

Optionally, the eighth time is 9-10 minutes, such as 10 minutes, and the eleventh time is 7-8 minutes, such as 8 minutes.

Specifically, in this embodiment, referring to FIG. 2, the seventh time is 4 minutes, the seventh temperature is 4°C, the eighth time is 10 minutes, and the condition 1 enters the defrosting corresponding to defrosting Exit conditions are: the external coil temperature Tdp lasts for 4 minutes > 4 ℃, then exit defrosting, or the longest continuous defrosting time is 10 minutes, and exit defrosting if it is longer than 10 minutes; the ninth time is 3 minutes, the ninth temperature 6°C, the defrost exit condition corresponding to the entry into the defrost of the second condition is: if the external coil temperature Tdp lasts for 3 minutes > 6°C, the defrost will be exited, or the continuous defrost time is up to 10 minutes, and if it is longer than 10 minutes, the defrost will be exited. Frost; the tenth time is 3 minutes, the eleventh time is 8 minutes, and the defrosting exit condition corresponding to the entry into the defrosting of the third condition is: the external coil temperature Tdp lasts for 3 minutes > 4°C, then exit the defrosting, Or the longest continuous defrosting time is 8 minutes, and if it is longer than 8 minutes, it will exit defrosting; the twelfth time is 2 minutes, and the defrosting exit condition corresponding to the condition 4 entering defrosting is: the external coil temperature Tdp lasts for 2 minutes > 6 ℃, exit defrosting, or the longest continuous defrosting time is 8 minutes, and exit defrosting if it is longer than 8 minutes.

By corresponding to different defrost exit conditions under different entry defrost conditions, based on the current weather conditions and humidity and the timeliness of corresponding defrost, the exit defrost conditions are set according to the following principles: for low limit defrost conditions, the correspondence is more stringent Defrost exit conditions (for example, the eighth time is 10 minutes), so that in each defrost control cycle, corresponding to the high humidity can achieve timely and sufficient defrosting; for high limit defrosting conditions corresponding to Loose defrosting exit conditions (for example, corresponding to the eleventh time is 8 minutes), so that in each defrosting control cycle, corresponding to the relatively low humidity and not too severe frosting, avoid resource occupation time too long, The necessary defrosting can be achieved.

To sum up, in this embodiment, the control method judges whether to enter defrosting according to the real-time weather conditions, humidity, external environment temperature and external coil temperature, and factors related to weather conditions and humidity are added to the defrosting conditions. It is helpful to adopt the corresponding defrosting judgment condition (low limit defrosting condition) in the case of rainy days and high humidity to facilitate timely defrosting, so as to avoid severe frosting on the condenser during heating operation due to high humidity And the problem of defrosting not in time; in the case of relatively low humidity, because the situation corresponding to frosting is not very serious, so a more stringent defrosting judgment condition (high limit defrosting condition) is adopted in order to According to different weather conditions and humidity, different degrees of defrosting conditions are predicted, and then based on the external ambient temperature and the temperature of the external coil, according to the threshold conditions under different requirements, it is judged whether to enter defrosting or exit defrosting. Frost, by adding judging factors related to weather conditions and humidity to achieve optimal control of defrosting, it still has a good heating effect in the case of high air humidity.

second embodiment

In a second exemplary embodiment of the present invention, a control system for defrosting an external unit of an air conditioner is provided.

Fig. 3 is a block diagram of a control system for defrosting an external unit of an air conditioner according to an embodiment of the present invention.

Referring to Fig. 3, the control system 3 for defrosting the air-conditioning outdoor unit of the present invention includes: a weather acquisition module 31, which is used to acquire real-time weather conditions; a temperature detection module 32, which is used to acquire real-time external ambient temperature and outer coil temperature The humidity detection module 33 is used to obtain the real-time humidity; the judgment module 34 is used to judge whether to enter the defrosting according to the real-time weather conditions, humidity, external environment temperature and the temperature of the outer coil tube and to determine whether to enter the defrosting after entering the defrosting. Satisfying the defrosting exit condition; and the defrosting control module 35, configured to enter the defrosting control or exit the defrosting control according to the judgment result of the judging module.

In this embodiment, the control system 3 is used to implement the control method shown in the first embodiment.

The control system adds factors related to weather conditions and humidity to the defrosting conditions, which helps to adopt corresponding defrosting judgment conditions (low limit defrosting conditions) in the case of rainy days and high humidity, so as to facilitate timely access to defrosting conditions. Frost, to avoid serious frost on the condenser during heating operation caused by high humidity and defrosting not in time; in the case of relatively low humidity, stricter defrosting judgment conditions are adopted (high limit defrosting Conditions) to re-enter defrosting at an appropriate (necessary) time, to predict different degrees of defrosting conditions corresponding to different weather conditions and humidity, and then based on the external ambient temperature and the temperature of the external coil, according to the threshold value under different requirements Condition judgment enters defrosting and exits defrosting, realizes optimal control of defrosting by adding judging factors related to weather conditions and humidity, and still has a good heating effect in the case of high air humidity.

third embodiment

In a third exemplary embodiment of the present invention, an air conditioner including the control system of the present invention or for executing the control method of the present invention is provided.

In this embodiment, a temperature and humidity sensor is installed on the back of the condenser of the external unit of the air conditioner, which is used to obtain the real-time external environment temperature and humidity at the same time; Temperature; the GPRS module of the air conditioner is used as a weather acquisition module 31 for acquiring real-time weather conditions.

The air conditioner realizes optimal control of defrosting by adding judging factors related to weather conditions and humidity, and still has a good heating effect in the case of high air humidity.

To sum up, the present invention provides a control method, system and air conditioner for defrosting the external unit of an air conditioner. By judging whether to enter defrosting according to real-time weather conditions, humidity, external environment temperature and external coil temperature, the defrosting conditions Factors related to weather conditions and humidity have been added, which is helpful to adopt corresponding defrosting judgment conditions (low limit defrosting conditions) in rainy days and high humidity conditions to facilitate timely defrosting, so as to avoid problems caused by high humidity. During the heating operation, the frosting on the condenser is serious and the defrosting is not timely; in the case of relatively low humidity, since the corresponding situation of frosting is not very serious, a stricter defrosting judgment condition is adopted (high Limit the defrosting conditions) to enter the defrosting at an appropriate (necessary) time, and predict the defrosting conditions to different degrees according to different weather conditions and humidity, and then based on the external ambient temperature and the temperature of the external coil, according to different requirements The lower threshold condition determines whether to enter defrosting or exit defrosting, and realizes optimal control of defrosting by adding judgment factors related to weather conditions and humidity, and still has a good heating effect in the case of high air humidity.

Although the present invention is disclosed above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, so the protection scope of the present invention should be based on the scope defined in the claims.

Claims (10)

1. a kind of control method of outdoor machine of air-conditioner defrosting characterized by comprising

Under heating mode, real-time weather conditions, humidity, ambient temperature and outer coil temperature are obtained；

Judged whether to enter defrosting according to the real-time weather conditions, humidity, ambient temperature and outer coil temperature；And

Determine whether to meet defrosting exit criteria after into defrosting, exits defrosting control in time.

2. control method according to claim 1, which is characterized in that according to the real-time weather conditions, humidity, extraneous ring Border temperature and outer coil temperature judge whether that the method into defrosting includes:

Judge whether current weather condition and humidity meet the condition that rainy and humidity is greater than first threshold；

If current weather condition meets the condition that rainy and humidity is greater than first threshold, judge whether to meet lower limit defrosting Condition and determine whether to enter defrosting, the lower limit defrosting condition is one of the following two kinds condition, and any condition satisfaction is Into defrosting: condition one, the ambient temperature are less than or equal to outer coil temperature described in second threshold and third consecutive time Less than third threshold value；Condition two, the ambient temperature are greater than outer coil temperature described in second threshold and continuous 4th time Less than the 4th threshold value；

If current weather condition is unsatisfactory for the condition that rainy and humidity is greater than first threshold, judge whether that meeting high limitation removes Ice-lolly part and determine whether to enter defrosting, the high limitation defrosting condition is one of the following two kinds condition, and any condition meets Enter defrosting: condition three, the ambient temperature are less than or equal to external disk tube temperature described in second threshold and continuous 5th time Degree is less than the 5th threshold value；Condition four, the ambient temperature are greater than external disk tube temperature described in second threshold and continuous 6th time Degree is less than the 6th threshold value；

Wherein, the 4th threshold value < third threshold value < 0, the third time the 4th time >；The 6th threshold value < the 5th Threshold value < 0, the 6th time of the 5th time >；The 5th threshold value < third threshold value, the third time the 5th time >； The 4th threshold value of 6th threshold value <, the 4th time of the 6th time >.

3. control method according to claim 2, which is characterized in that the defrosting exit criteria is one of following condition, Any condition, which meets, exits defrosting: the outer coil temperature is greater than set temperature after continuing the first setting duration；Alternatively, even Continuous defrosting time is greater than the second setting duration, wherein the set temperature is greater than zero, and the first setting duration is less than described the Two setting durations.

4. control method according to claim 3, which is characterized in that the condition for entering defrosting is different, and corresponding defrosting is moved back Condition is different out, when meeting the entrance of condition one defrosting, corresponding defrosting exit criteria are as follows: described after continuing for the 7th time Outer coil temperature is greater than the 7th temperature, alternatively, continuous defrosting time was greater than for the 8th time；Enter defrosting when meeting the condition two When, corresponding defrosting exit criteria are as follows: the outer coil temperature is greater than the 9th temperature after continuing for the 9th time, alternatively, continuously removing The white time was greater than for the 8th time；When meeting the entrance of condition three defrosting, corresponding defrosting exit criteria are as follows: when continuing the tenth Between after the outer coil temperature be greater than the 7th temperature, alternatively, continuous defrosting time is greater than eleventh time；When meeting the condition When four entrance defrostings, corresponding defrosting exit criteria are as follows: the outer coil temperature is greater than the 9th temperature after continuing for the 12nd time, Alternatively, continuous defrosting time is greater than eleventh time；Wherein, the 9th temperature of the 7th temperature <, the 7th time > Nine times, the 12nd time of the tenth time >, the 8th time > eleventh time.

5. control method according to claim 2, which is characterized in that the first threshold is 75%~85%.

6. control method according to claim 4, which is characterized in that the 8th time be 9-10min, the described 11st Time are as follows: 7-8min.

7. a kind of control system of outdoor machine of air-conditioner defrosting characterized by comprising

Weather obtains module, for obtaining real-time weather conditions；Temperature detecting module, for obtain real-time ambient temperature and Outer coil temperature；Humidity detecting module, for obtaining real-time humidity；Judgment module, for according to real-time weather conditions, wet Degree, ambient temperature and outer coil temperature judge whether to enter defrosting and remove after entering defrosting for determining whether to meet White exit criteria；

And defrosting control module, enter defrosting control for the judgement result according to judgment module or exits defrosting control.

8. a kind of control system of outdoor machine of air-conditioner defrosting, which is characterized in that required described in any one of 1 to 6 for perform claim Control method.

9. a kind of air-conditioning, which is characterized in that including control system described in claim 7 or 8.

10. a kind of air-conditioning, which is characterized in that including control system as claimed in claim 7, wherein the outer machine of the air-conditioning condenses The device back side is provided with Temperature Humidity Sensor, for obtaining real-time ambient temperature and humidity simultaneously；The outer machine condenser bottom Portion is provided with external disk temperature sensor, for obtaining outer coil temperature；The GPRS module of the air-conditioning obtains module as weather, For obtaining real-time weather conditions.