CN108195026B - Defrosting control method, control device, air conditioner and readable storage medium - Google Patents
Defrosting control method, control device, air conditioner and readable storage medium Download PDFInfo
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- CN108195026B CN108195026B CN201711390282.0A CN201711390282A CN108195026B CN 108195026 B CN108195026 B CN 108195026B CN 201711390282 A CN201711390282 A CN 201711390282A CN 108195026 B CN108195026 B CN 108195026B
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Abstract
The invention provides a defrosting control method, a control device, an air conditioner and a readable storage medium, wherein the defrosting control method comprises the following steps: after the defrosting mode is detected, respectively detecting the cold outlet temperature in the flow path of the outdoor heat exchanger and the exhaust temperature of the compressor according to a preset detection period; determining a corresponding defrosting trend temperature difference according to the exhaust temperature and the cold outlet temperature detected in each detection period; the trend relationship between the first defrosting trend temperature difference and the second defrosting trend temperature difference is detected, so that the subsequent defrosting operation is executed according to the trend relationship, wherein the first defrosting trend temperature difference is the defrosting trend temperature difference determined after the current detection period is finished, and the second defrosting temperature difference is the defrosting trend temperature difference determined after the last detection period is finished.
Description
Technical Field
The invention relates to the field of heat pumps, in particular to a defrosting control method, a defrosting control device, an air conditioner and a computer readable storage medium.
Background
In the related art, the outdoor unit of the air conditioner often has the condition that the outdoor unit of the air conditioner is completely defrosted but still in the defrosting mode, and the occurrence of frostless defrosting is derived, and the frostless defrosting lasts for a period of time according to the control process, and the following defects exist:
(1) the heating energy efficiency of the whole air conditioning system is influenced;
(2) even if the frost-free defrosting time is too long, the normal use of the user is influenced.
Disclosure of Invention
In order to solve at least one of the above technical problems, an object of the present invention is to provide a defrosting control method.
Another object of the present invention is to provide a defrosting control apparatus.
It is still another object of the present invention to provide an air conditioner.
It is yet another object of the present invention to provide a computer-readable storage medium.
In order to achieve the above object, an embodiment of a first aspect of the present invention proposes a defrosting control method including: after the defrosting mode is detected, respectively detecting the cold outlet temperature in the flow path of the outdoor heat exchanger and the exhaust temperature of the compressor according to a preset detection period; determining a corresponding defrosting trend temperature difference according to the exhaust temperature and the cold outlet temperature detected in each detection period; and detecting the trend relationship between the first defrosting trend temperature difference and the second defrosting trend temperature difference so as to execute subsequent defrosting operation according to the trend relationship, wherein the first defrosting trend temperature difference is the defrosting trend temperature difference determined after the current detection period is finished, and the second defrosting temperature difference is the defrosting trend temperature difference determined after the last detection period is finished.
In the technical scheme, after a detection period is finished, the cold outlet temperature of the outdoor heat exchanger flow path and the exhaust temperature of the compressor are respectively collected, the difference between the exhaust temperature and the cold outlet temperature is determined as the defrosting trend temperature, the heat energy released by cooling the refrigerant in the heat exchanger is represented by the defrosting trend temperature, thereby indicating that the defrosting operation is not finished when the heat release quantity of the refrigerant required by the defrosting of the heat exchanger is detected to be increased or kept level with the previous heat release quantity after entering the next period, when the gradual increase or decrease of the heat release quantity of the refrigerant required by the defrosting of the heat exchanger is detected, the defrosting operation is nearly completed, the corresponding defrosting operation step can be determined according to the trend relationship, the controllability of the defrosting operation is realized, the probability that the defrosting operation is still executed after the defrosting of the outdoor unit of the air conditioner is finished is reduced, and therefore the energy attenuation caused by the defrosting operation without defrosting is reduced.
Specifically, in a heating operation mode of the air conditioner, when a defrosting instruction is detected to be received, the outdoor unit is controlled to enter the defrosting mode while the heating operation mode is continued.
The detection period may be 5s, 10s, etc.
In addition, the defrosting control method in the above embodiment provided by the present invention may further have the following additional technical features:
in the above technical solution, preferably, detecting a cold-out temperature in a flow path of the outdoor heat exchanger specifically includes the following steps: respectively and synchronously acquiring real-time refrigerant temperatures at a plurality of flow path outlets of the outdoor heat exchanger; and determining the temperature of the refrigerant with the minimum temperature value as the cooling temperature.
In the technical scheme, the refrigerant temperature at the outlet with the minimum temperature value is determined as the cold outlet temperature, the outlet refrigerant temperature of each heat exchange pipeline corresponds to the defrosting degree of the heat exchange pipeline, the lower the refrigerant temperature is, the more serious the current frosting degree is shown, and the refrigerant temperature at the outlet with the minimum temperature value is taken as the cold outlet temperature, so that after the defrosting operation of the heat exchange pipeline corresponding to the temperature is finished, the other heat exchange pipelines are completely defrosted.
In any one of the above technical solutions, preferably, the trend relationship between the first defrosting trend temperature difference and the second defrosting trend temperature difference is detected, so as to perform the subsequent defrosting operation according to the trend relationship, and specifically includes the following steps: when the first defrosting trend temperature difference is smaller than the second defrosting trend temperature difference, detecting a temperature difference relation between the first defrosting trend temperature difference and a preset temperature difference threshold value so as to determine whether to execute defrosting operation according to the temperature difference relation; and when the first defrosting trend temperature difference is detected to be larger than or equal to the second defrosting trend temperature difference, controlling to continuously execute the defrosting operation, and controlling to continuously execute the defrosting operation so as to detect the trend relationship again after the duration of the detection period continues to pass.
In the technical scheme, the first defrosting trend temperature difference and the second defrosting trend temperature difference are compared, and after the first defrosting trend temperature difference is detected to be smaller than the second defrosting trend temperature difference, the relation between the first defrosting trend temperature difference and a preset temperature difference threshold value is further detected, the finished defrosting degree is determined, the next defrosting operation is executed according to the finished defrosting degree, and the accuracy of defrosting operation control is further improved.
In any of the above technical solutions, preferably, determining whether to continue to perform the defrosting operation according to the temperature difference relationship includes the following steps: when the first defrosting trend temperature difference is detected to be smaller than a preset temperature difference threshold value, collecting the temperature of a refrigerant at a designated position of a middle area on a flow path of the outdoor heat exchanger to serve as the middle temperature; when the detected cold temperature is greater than a preset temperature threshold value, controlling to end defrosting operation; and when the detected cold medium temperature is less than or equal to the preset temperature threshold value, controlling to continuously execute the defrosting operation.
According to the technical scheme, when the first defrosting trend temperature difference is detected to be smaller than the preset temperature difference threshold value, it is indicated that the current defrosting operation is further close to a critical point for completing the defrosting operation, at the moment, the relation between the cold medium temperature and the preset temperature threshold value is further detected to further determine whether the defrosting operation is completed or not, the preset temperature threshold value represents that no defrosting is formed on a fin of the outdoor heat exchanger, at the moment, the defrosting operation is controlled to be finished by controlling the compressor to stop running, the fact that the defrosting operation of the outdoor unit of the air conditioner is still executed after the defrosting operation is finished is avoided, and energy efficiency attenuation caused by continuous running of the compressor is further avoided.
In any of the above technical solutions, preferably, the method further includes: and when the first defrosting trend temperature difference is detected to be larger than or equal to the preset temperature difference threshold value, controlling to continuously execute the defrosting operation.
In the technical scheme, when the first defrosting trend temperature difference is detected to be larger than or equal to the preset temperature difference threshold value, the situation that a large amount of heat released from the gaseous refrigerant discharged from the compressor is changed into the liquid refrigerant at the outlet of the flow path is shown, so that the fin of the outdoor heat exchanger still needs a large amount of heat to defrost, the defrosting operation is continuously executed to continuously release heat until the first defrosting trend temperature difference is smaller than the preset temperature difference threshold value, and therefore the defrosting operation process is smoothly carried out.
In any of the above technical solutions, preferably, before the detecting that the defrosting mode is entered, the method further includes: collecting the ambient temperature of an outdoor unit of an air conditioner; correcting the pre-stored temperature difference threshold value according to the environment temperature to obtain a preset temperature difference threshold value; and/or correcting the pre-stored temperature threshold value according to the environment temperature to obtain the preset temperature threshold value.
In this technical scheme, through gathering ambient temperature to confirm the environmental condition that outdoor heat exchanger is located, ambient temperature is different, and the discharge pressure also can be different, and corresponding condensing temperature also is different, thereby makes preset temperature difference threshold value also have the fluctuation with preset temperature threshold value, through carrying out corresponding correction operation according to ambient temperature, further promotes the degree of accuracy of preset temperature difference threshold value and/or preset temperature threshold value setting, with the accuracy of further promotion defrosting process control.
An embodiment of a second aspect of the present invention proposes a defrosting control apparatus including: the detection unit is used for respectively detecting the cold outlet temperature in the outdoor heat exchanger flow path and the exhaust temperature of the compressor in each period according to the preset detection period after the defrosting mode is detected to be started; the determining unit is used for determining the corresponding defrosting trend temperature difference according to the exhaust temperature and the cold-out temperature detected in each detection period; the detection unit is further configured to: and detecting the trend relationship between the first defrosting trend temperature difference and the second defrosting trend temperature difference so as to execute subsequent defrosting operation according to the trend relationship, wherein the first defrosting trend temperature difference is the defrosting trend temperature difference determined after the current detection period is finished, and the second defrosting temperature difference is the defrosting trend temperature difference determined after the last detection period is finished.
In the technical scheme, after a detection period is finished, the cold outlet temperature of the outdoor heat exchanger flow path and the exhaust temperature of the compressor are respectively collected, the difference between the exhaust temperature and the cold outlet temperature is determined as the defrosting trend temperature, the heat energy released by cooling the refrigerant in the heat exchanger is represented by the defrosting trend temperature, thereby indicating that the defrosting operation is not finished when the heat release quantity of the refrigerant required by the defrosting of the heat exchanger is detected to be increased or kept level with the previous heat release quantity after entering the next period, when the gradual increase or decrease of the heat release quantity of the refrigerant required by the defrosting of the heat exchanger is detected, the defrosting operation is nearly completed, the corresponding defrosting operation step can be determined according to the trend relationship, the controllability of the defrosting operation is realized, the probability that the defrosting operation is still executed after the defrosting of the outdoor unit of the air conditioner is finished is reduced, and therefore the energy attenuation caused by the defrosting operation without defrosting is reduced.
Specifically, in a heating operation mode of the air conditioner, when a defrosting instruction is detected to be received, the outdoor unit is controlled to enter the defrosting mode while the heating operation mode is continued.
The detection period may be 5s, 10s, etc.
In the above technical solution, preferably, the method further includes: the acquisition unit is used for respectively and synchronously acquiring the real-time refrigerant temperatures at the outlets of the plurality of flow paths of the outdoor heat exchanger; the determination unit is further configured to: and determining the temperature of the refrigerant with the minimum temperature value as the cooling temperature.
In the technical scheme, the refrigerant temperature at the outlet with the minimum temperature value is determined as the cold outlet temperature, the outlet refrigerant temperature of each heat exchange pipeline corresponds to the defrosting degree of the heat exchange pipeline, the lower the refrigerant temperature is, the more serious the current frosting degree is shown, and the refrigerant temperature at the outlet with the minimum temperature value is taken as the cold outlet temperature, so that after the defrosting operation of the heat exchange pipeline corresponding to the temperature is finished, the other heat exchange pipelines are completely defrosted.
In any of the above technical solutions, preferably, the detection unit is further configured to: when the first defrosting trend temperature difference is smaller than the second defrosting trend temperature difference, detecting a temperature difference relation between the first defrosting trend temperature difference and a preset temperature difference threshold value so as to determine whether to execute defrosting operation according to the temperature difference relation; and when the first defrosting trend temperature difference is detected to be larger than or equal to the second defrosting trend temperature difference, controlling to continuously execute the defrosting operation, and controlling to continuously execute the defrosting operation so as to detect the trend relationship again after the duration of the detection period continues to pass.
In the technical scheme, the first defrosting trend temperature difference and the second defrosting trend temperature difference are compared, and after the first defrosting trend temperature difference is detected to be smaller than the second defrosting trend temperature difference, the relation between the first defrosting trend temperature difference and a preset temperature difference threshold value is further detected, the finished defrosting degree is determined, the next defrosting operation is executed according to the finished defrosting degree, and the accuracy of defrosting operation control is further improved.
In any of the above technical solutions, preferably, the acquisition unit is further configured to: when the first defrosting trend temperature difference is detected to be smaller than a preset temperature difference threshold value, collecting the temperature of a refrigerant at a designated position of a middle area on a flow path of the outdoor heat exchanger to serve as the middle temperature; the defrosting control device further comprises: the control unit is used for controlling the end of defrosting operation when the temperature in the cold is detected to be greater than the preset temperature threshold value; the control unit is further configured to: and when the detected cold medium temperature is less than or equal to the preset temperature threshold value, controlling to continuously execute the defrosting operation.
According to the technical scheme, when the first defrosting trend temperature difference is detected to be smaller than the preset temperature difference threshold value, it is indicated that the current defrosting operation is further close to a critical point for completing the defrosting operation, at the moment, the relation between the cold medium temperature and the preset temperature threshold value is further detected to further determine whether the defrosting operation is completed or not, the preset temperature threshold value represents that no defrosting is formed on a fin of the outdoor heat exchanger, at the moment, the defrosting operation is controlled to be finished by controlling the compressor to stop running, the fact that the defrosting operation of the outdoor unit of the air conditioner is still executed after the defrosting operation is finished is avoided, and energy efficiency attenuation caused by continuous running of the compressor is further avoided.
In any of the above technical solutions, preferably, the control unit is further configured to: and when the first defrosting trend temperature difference is detected to be larger than or equal to the preset temperature difference threshold value, controlling to continuously execute the defrosting operation.
In the technical scheme, when the first defrosting trend temperature difference is detected to be larger than or equal to the preset temperature difference threshold value, the situation that a large amount of heat released from the gaseous refrigerant discharged from the compressor is changed into the liquid refrigerant at the outlet of the flow path is shown, so that the fin of the outdoor heat exchanger still needs a large amount of heat to defrost, the defrosting operation is continuously executed to continuously release heat until the first defrosting trend temperature difference is smaller than the preset temperature difference threshold value, and therefore the defrosting operation process is smoothly carried out.
In any of the above technical solutions, preferably, the acquisition unit is further configured to: collecting the ambient temperature of an outdoor unit of an air conditioner; the defrosting control device further comprises: the correcting unit is used for correcting the pre-stored temperature difference threshold value according to the environment temperature so as to obtain a preset temperature difference threshold value; and/or the correction unit is further adapted to: and correcting the pre-stored temperature threshold according to the environment temperature to obtain a preset temperature threshold.
In this technical scheme, through gathering ambient temperature to confirm the environmental condition that outdoor heat exchanger is located, ambient temperature is different, and the discharge pressure also can be different, and corresponding condensing temperature also is different, thereby makes preset temperature difference threshold value also have the fluctuation with preset temperature threshold value, through carrying out corresponding correction operation according to ambient temperature, further promotes the degree of accuracy of preset temperature difference threshold value and/or preset temperature threshold value setting, with the accuracy of further promotion defrosting process control.
A third aspect of the present invention provides an air conditioner, which includes a processor, and the processor is configured to implement the steps of the defrosting control method according to any one of the above technical solutions and/or the defrosting control device according to any one of the above technical solutions when executing a computer program stored in a memory.
A fourth aspect of the present invention proposes a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the defrosting control method according to any one of the above-mentioned technical solutions.
According to the technical scheme of the invention, the judgment logic that the basic defrosting of the outer machine is finished is judged according to the change trend of the defrosting trend temperature difference by (1); (2) accurately judging the judgment logic that the external machine frost is completely finished according to the combination of the defrosting trend temperature difference and the cold medium temperature value; (3) the judgment logic for accurately judging the complete defrosting of the external unit by combining the difference value between the cold outlet temperature and the exhaust temperature and the cold medium temperature value is defined, and the frostless defrosting phenomenon is accurately avoided.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 shows a schematic flow diagram of a defrost control method according to one embodiment of the present invention;
FIG. 2 illustrates a schematic block diagram of a defrosting control apparatus according to an embodiment of the present invention;
FIG. 3 shows a schematic flow diagram of a defrost control method according to another embodiment of the invention;
fig. 4 shows a schematic block diagram of an air conditioner according to an embodiment of the present invention.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
A defrosting control method according to some embodiments of the present invention is described below with reference to fig. 1.
As shown in fig. 1, a defrosting control method according to an embodiment of the present invention includes: 102, after the defrosting mode is detected, respectively detecting the cold outlet temperature in the flow path of the outdoor heat exchanger and the exhaust temperature of the compressor according to a preset detection period; 104, determining a corresponding defrosting trend temperature difference according to the exhaust temperature and the cold-out temperature detected in each detection period; and 106, detecting a trend relationship between a first defrosting trend temperature difference and a second defrosting trend temperature difference to execute subsequent defrosting operation according to the trend relationship, wherein the first defrosting trend temperature difference is a defrosting trend temperature difference determined after the current detection period is finished, and the second defrosting temperature difference is a defrosting trend temperature difference determined after the last detection period is finished.
In this embodiment, after one detection period is completed, by separately collecting the cool-out temperature of the outdoor heat exchanger flow path and the discharge temperature of the compressor, the difference between the exhaust temperature and the cold outlet temperature is determined as the defrosting trend temperature, the heat energy released by cooling the refrigerant in the heat exchanger is represented by the defrosting trend temperature, thereby indicating that the defrosting operation is not finished when the heat release quantity of the refrigerant required by the defrosting of the heat exchanger is detected to be increased or kept level with the previous heat release quantity after entering the next period, when the gradual increase or decrease of the heat release quantity of the refrigerant required by the defrosting of the heat exchanger is detected, the defrosting operation is nearly completed, the corresponding defrosting operation step can be determined according to the trend relationship, the controllability of the defrosting operation is realized, the probability that the defrosting operation is still executed after the defrosting of the outdoor unit of the air conditioner is finished is reduced, and therefore the energy attenuation caused by the defrosting operation without defrosting is reduced.
Specifically, in a heating operation mode of the air conditioner, when a defrosting instruction is detected to be received, the outdoor unit is controlled to enter the defrosting mode while the heating operation mode is continued.
The detection period may be 5s, 10s, etc.
In addition, when the outdoor heat exchanger is provided with a plurality of heat exchange flow paths, the refrigerant temperature at the outlet of a specified pipeline can be acquired only according to the acquisition mode of the cold outlet temperature, the average value of a plurality of refrigerant temperatures can be acquired, and the minimum value of the plurality of refrigerant temperatures can be acquired.
And executing subsequent defrosting operation according to the trend relationship, determining the corresponding defrosting operation step by continuously detecting the temperature change, and controlling the compressor to continuously run for executing time to finish the defrosting operation.
Specifically, in the defrosting mode, the compressor runs periodically, a high-temperature and high-pressure refrigerant in a body state generated after being compressed by the compressor is guided into a flow path of the outdoor heat exchanger by controlling a passage of the four-way valve, the outdoor heat exchanger is cooled by the refrigerator to release heat to form normal-temperature and high-pressure liquid to defrost fins on the heat exchanger, and at the moment, the indoor fan does not run to avoid refrigerating the indoor space.
In addition, the defrosting control method in the above embodiment provided by the present invention may further have the following additional technical features:
in the above embodiment, preferably, the detecting of the cold outlet temperature in the outdoor heat exchanger flow path specifically includes the following steps: respectively and synchronously acquiring real-time refrigerant temperatures at a plurality of flow path outlets of the outdoor heat exchanger; and determining the temperature of the refrigerant with the minimum temperature value as the cooling temperature.
In this embodiment, the refrigerant temperature at the outlet with the minimum temperature value is determined as the cold outlet temperature, the outlet refrigerant temperature of each heat exchange pipeline corresponds to the defrosting degree of the heat exchange pipeline, the lower the refrigerant temperature is, the more serious the current frosting degree is, and the refrigerant temperature at the outlet with the minimum temperature value is taken as the cold outlet temperature, so that it can be ensured that after the defrosting operation of the heat exchange pipeline corresponding to the temperature is completed, the other heat exchange pipelines have completed complete defrosting.
In any of the foregoing embodiments, preferably, the trend relationship between the first defrosting trend temperature difference and the second defrosting trend temperature difference is detected, so as to perform the subsequent defrosting operation according to the trend relationship, and specifically includes the following steps: when the first defrosting trend temperature difference is smaller than the second defrosting trend temperature difference, detecting a temperature difference relation between the first defrosting trend temperature difference and a preset temperature difference threshold value so as to determine whether to execute defrosting operation according to the temperature difference relation; and when the first defrosting trend temperature difference is detected to be larger than or equal to the second defrosting trend temperature difference, controlling to continuously execute the defrosting operation, and controlling to continuously execute the defrosting operation so as to detect the trend relationship again after the duration of the detection period continues to pass.
In the embodiment, the first defrosting trend temperature difference and the second defrosting trend temperature difference are compared, and after the first defrosting trend temperature difference is detected to be smaller than the second defrosting trend temperature difference, the relation between the first defrosting trend temperature difference and a preset temperature difference threshold value is further detected, the finished defrosting degree is determined, the next defrosting operation is executed according to the finished defrosting degree, and the accuracy of defrosting operation control is further improved.
And after the first defrosting trend temperature difference is detected to be smaller than the second defrosting trend temperature difference, the defrosting operation can be directly controlled to be ended.
In addition, the preset temperature difference threshold value can be predetermined through experiments and stored in a memory connected with the control chip, and can also be further determined by combining the current outdoor environment temperature.
In any of the above embodiments, preferably, determining whether to continue to perform the defrosting operation according to the temperature difference relationship specifically includes the following steps: when the first defrosting trend temperature difference is detected to be smaller than a preset temperature difference threshold value, collecting the temperature of a refrigerant at a designated position of a middle area on a flow path of the outdoor heat exchanger to serve as the middle temperature; when the detected cold temperature is greater than a preset temperature threshold value, controlling to end defrosting operation; and when the detected cold medium temperature is less than or equal to the preset temperature threshold value, controlling to continuously execute the defrosting operation.
In the embodiment, when the first defrosting trend temperature difference is detected to be smaller than the preset temperature difference threshold, it is indicated that the current defrosting operation is further close to a critical point of the defrosting operation, at this time, the relationship between the cold medium temperature and the preset temperature threshold is further detected to further determine whether the defrosting operation is finished, the preset temperature threshold represents that no defrosting is formed on the fins of the outdoor heat exchanger, at this time, the compressor is controlled to stop running to control the defrosting operation to be finished, the outdoor unit of the air conditioner is prevented from still performing the defrosting operation after the defrosting operation is finished, and energy efficiency attenuation caused by continuous running of the compressor is further avoided.
Specifically, during the defrosting operation, the cold medium temperature gradually rises, and when the cold medium temperature rises to a preset temperature threshold value, the defrosting operation is finished.
In addition, the preset temperature threshold value can be predetermined through experiments and stored in a memory connected with the control chip, and can also be further determined by combining the current outdoor environment temperature.
In any of the above embodiments, preferably, the method further includes: and when the first defrosting trend temperature difference is detected to be larger than or equal to the preset temperature difference threshold value, controlling to continuously execute the defrosting operation.
In this embodiment, when it is detected that the first defrosting trend temperature difference is greater than or equal to the preset temperature difference threshold, it is indicated that a large amount of heat released from the gaseous refrigerant discharged from the compressor is changed into a liquid refrigerant at the outlet of the flow path, so that it is indicated that the fins of the outdoor heat exchanger still need a large amount of heat to defrost.
In any of the above embodiments, preferably, before detecting that the defrosting mode is entered, the method further includes: collecting the ambient temperature of an outdoor unit of an air conditioner; correcting the pre-stored temperature difference threshold value according to the environment temperature to obtain a preset temperature difference threshold value; and/or correcting the pre-stored temperature threshold value according to the environment temperature to obtain the preset temperature threshold value.
In this embodiment, the ambient temperature is collected to determine the ambient state of the outdoor heat exchanger, the ambient temperature is different, the exhaust pressure is also different, and the corresponding condensing temperature is also different, so that the preset temperature difference threshold value and the preset temperature threshold value are also fluctuated, and the accuracy of setting the preset temperature difference threshold value and/or the preset temperature threshold value is further improved by executing the corresponding correction operation according to the ambient temperature, so as to further improve the accuracy of defrosting process control.
As shown in fig. 2, the defrosting control apparatus 200 according to the embodiment of the present invention includes: the detection unit 202 is used for respectively detecting the cold outlet temperature in the outdoor heat exchanger flow path and the exhaust temperature of the compressor in each period according to a preset detection period after the defrosting mode is detected to be started; a determining unit 206 for determining a corresponding defrosting trend temperature difference according to the exhaust temperature and the cold-out temperature detected in each detection period; the detection unit 202 is further configured to: and detecting the trend relationship between the first defrosting trend temperature difference and the second defrosting trend temperature difference so as to execute subsequent defrosting operation according to the trend relationship, wherein the first defrosting trend temperature difference is the defrosting trend temperature difference determined after the current detection period is finished, and the second defrosting temperature difference is the defrosting trend temperature difference determined after the last detection period is finished.
In this embodiment, after one detection period is completed, by separately collecting the cool-out temperature of the outdoor heat exchanger flow path and the discharge temperature of the compressor, the difference between the exhaust temperature and the cold outlet temperature is determined as the defrosting trend temperature, the heat energy released by cooling the refrigerant in the heat exchanger is represented by the defrosting trend temperature, thereby indicating that the defrosting operation is not finished when the heat release quantity of the refrigerant required by the defrosting of the heat exchanger is detected to be increased or kept level with the previous heat release quantity after entering the next period, when the gradual increase or decrease of the heat release quantity of the refrigerant required by the defrosting of the heat exchanger is detected, the defrosting operation is nearly completed, the corresponding defrosting operation step can be determined according to the trend relationship, the controllability of the defrosting operation is realized, the probability that the defrosting operation is still executed after the defrosting of the outdoor unit of the air conditioner is finished is reduced, and therefore the energy attenuation caused by the defrosting operation without defrosting is reduced.
Specifically, in a heating operation mode of the air conditioner, when a defrosting instruction is detected to be received, the outdoor unit is controlled to enter the defrosting mode while the heating operation mode is continued.
The detection period may be 5s, 10s, etc.
When the outdoor heat exchanger is provided with a plurality of heat exchange flow paths, the temperature of the refrigerant at the outlet of a specified pipeline can be only acquired according to the acquisition mode of the cold outlet temperature, the temperature of a plurality of refrigerants can be acquired to be averaged, and the temperature of a plurality of refrigerants can be acquired to be the minimum value.
And executing subsequent defrosting operation according to the trend relationship, determining the corresponding defrosting operation step by continuously detecting the temperature change, and controlling the compressor to continuously run for executing time to finish the defrosting operation.
Specifically, in the defrosting mode, the compressor runs periodically, a high-temperature and high-pressure refrigerant in a body state generated after being compressed by the compressor is guided into a flow path of the outdoor heat exchanger by controlling a passage of the four-way valve, the outdoor heat exchanger is cooled by the refrigerator to release heat to form normal-temperature and high-pressure liquid to defrost fins on the heat exchanger, and at the moment, the indoor fan does not run to avoid refrigerating the indoor space.
In the above embodiment, preferably, the method further includes: the acquisition unit 206 is configured to respectively and synchronously acquire real-time refrigerant temperatures at a plurality of flow path outlets of the outdoor heat exchanger; the determining unit 204 is further configured to: and determining the temperature of the refrigerant with the minimum temperature value as the cooling temperature.
In this embodiment, the refrigerant temperature at the outlet with the minimum temperature value is determined as the cold outlet temperature, the outlet refrigerant temperature of each heat exchange pipeline corresponds to the defrosting degree of the heat exchange pipeline, the lower the refrigerant temperature is, the more serious the current frosting degree is, and the refrigerant temperature at the outlet with the minimum temperature value is taken as the cold outlet temperature, so that it can be ensured that after the defrosting operation of the heat exchange pipeline corresponding to the temperature is completed, the other heat exchange pipelines have completed complete defrosting.
In any of the above embodiments, preferably, the detection unit 206 is further configured to: when the first defrosting trend temperature difference is smaller than the second defrosting trend temperature difference, detecting a temperature difference relation between the first defrosting trend temperature difference and a preset temperature difference threshold value so as to determine whether to execute defrosting operation according to the temperature difference relation; and when the first defrosting trend temperature difference is detected to be larger than or equal to the second defrosting trend temperature difference, controlling to continuously execute the defrosting operation, and controlling to continuously execute the defrosting operation so as to detect the trend relationship again after the duration of the detection period continues to pass.
In the embodiment, the first defrosting trend temperature difference and the second defrosting trend temperature difference are compared, and after the first defrosting trend temperature difference is detected to be smaller than the second defrosting trend temperature difference, the relation between the first defrosting trend temperature difference and a preset temperature difference threshold value is further detected, the finished defrosting degree is determined, the next defrosting operation is executed according to the finished defrosting degree, and the accuracy of defrosting operation control is further improved.
And after the first defrosting trend temperature difference is detected to be smaller than the second defrosting trend temperature difference, the defrosting operation can be directly controlled to be ended.
In addition, the preset temperature difference threshold value can be predetermined through experiments and stored in a memory connected with the control chip, and can also be further determined by combining the current outdoor environment temperature.
In any of the above embodiments, preferably, the acquisition unit 206 is further configured to: when the first defrosting trend temperature difference is detected to be smaller than a preset temperature difference threshold value, collecting the temperature of a refrigerant at a designated position of a middle area on a flow path of the outdoor heat exchanger to serve as the middle temperature; the defrosting control device 200 further includes: a control unit 208 for controlling to end the defrosting operation when the temperature in the cold is detected to be greater than the preset temperature threshold; the control unit 208 is further configured to: and when the detected cold medium temperature is less than or equal to the preset temperature threshold value, controlling to continuously execute the defrosting operation.
In the embodiment, when the first defrosting trend temperature difference is detected to be smaller than the preset temperature difference threshold, it is indicated that the current defrosting operation is further close to a critical point of the defrosting operation, at this time, the relationship between the cold medium temperature and the preset temperature threshold is further detected to further determine whether the defrosting operation is finished, the preset temperature threshold represents that no defrosting is formed on the fins of the outdoor heat exchanger, at this time, the compressor is controlled to stop running to control the defrosting operation to be finished, the outdoor unit of the air conditioner is prevented from still performing the defrosting operation after the defrosting operation is finished, and energy efficiency attenuation caused by continuous running of the compressor is further avoided.
Specifically, during the defrosting operation, the cold medium temperature gradually rises, and when the cold medium temperature rises to a preset temperature threshold value, the defrosting operation is finished.
In addition, the preset temperature threshold value can be predetermined through experiments and stored in a memory connected with the control chip, and can also be further determined by combining the current outdoor environment temperature.
In any of the above embodiments, preferably, the control unit 208 is further configured to: and when the first defrosting trend temperature difference is detected to be larger than or equal to the preset temperature difference threshold value, controlling to continuously execute the defrosting operation.
In this embodiment, when it is detected that the first defrosting trend temperature difference is greater than or equal to the preset temperature difference threshold, it is indicated that a large amount of heat released from the gaseous refrigerant discharged from the compressor is changed into a liquid refrigerant at the outlet of the flow path, so that it is indicated that the fins of the outdoor heat exchanger still need a large amount of heat to defrost.
In any of the above embodiments, preferably, the acquisition unit 202 is further configured to: collecting the ambient temperature of an outdoor unit of an air conditioner; the defrosting control device 200 further includes: the correcting unit 210 is configured to correct the pre-stored temperature difference threshold according to the environmental temperature to obtain a preset temperature difference threshold; and/or the correction unit 210 is further configured to: and correcting the pre-stored temperature threshold according to the environment temperature to obtain a preset temperature threshold.
In this embodiment, the ambient temperature is collected to determine the ambient state of the outdoor heat exchanger, the ambient temperature is different, the exhaust pressure is also different, and the corresponding condensing temperature is also different, so that the preset temperature difference threshold value and the preset temperature threshold value are also fluctuated, and the accuracy of setting the preset temperature difference threshold value and/or the preset temperature threshold value is further improved by executing the corresponding correction operation according to the ambient temperature, so as to further improve the accuracy of defrosting process control.
Fig. 3 shows a schematic flowchart of a defrosting control apparatus according to another embodiment of the present invention.
As shown in fig. 3, the defrosting control device according to another embodiment of the present invention includes a step 302 of recording the number n of cycles of temperature detection operation when entering the defrosting mode is detected, where the duration of each cycle is a, a step 304 of detecting the refrigerant temperatures at the outlets of m flow paths in the outdoor heat exchanger after the duration of a × n and determining the lowest refrigerant temperature as a cold outlet temperature T1, a step 306 of collecting the discharge temperature T2 of the compressor, a step 308 of calculating △ T-T2 and defining △ T as a defrosting trend temperature difference, and a step 310 of determining △ T-T1 and determining △ T-Tn<△Tn-1If yes, the process proceeds to step 312, if no, the process proceeds to step 318, if step 312 determines that defrosting of the outdoor unit of the air conditioner is substantially completed, and the process continues to determine △ Tn<A, if the detection result is yes, the process proceeds to step 314, and if the detection result is no, the process proceeds to step 318; step by stepStep 314, collect the cool intermediate temperature T3, and continue to judge T3>B, when the judgment result is yes, the step proceeds to step 316, and when the judgment result is no, the step proceeds to step 318; and step 316, determining that the defrosting operation is finished, and controlling to exit the defrosting mode, and step 318, continuing the defrosting operation, and entering the temperature detection operation of the next period.
Wherein n is a variable, the current detection period is characterized, and n-1 represents the last detection period.
As shown in fig. 4, according to the air conditioner 40 of the embodiment of the present invention, the air conditioner 40 includes a processor 404, and the processor 404 is configured to implement the steps of the defrosting control method according to any one of the above embodiments when executing the computer program stored in the memory 402.
A computer-readable storage medium according to an embodiment of the present invention, having a computer program stored thereon, the computer program, when executed by a processor, implementing the steps of the defrosting control method as in any one of the above-described embodiments.
The steps in the method of the embodiment of the invention can be sequentially adjusted, combined and deleted according to actual needs.
The units in the device of the embodiment of the invention can be merged, divided and deleted according to actual needs.
It will be understood by those skilled in the art that all or part of the steps in the methods of the embodiments described above may be implemented by instructions associated with a program, which may be stored in a computer-readable storage medium, where the storage medium includes Read-Only Memory (ROM), Random Access Memory (RAM), Programmable Read-Only Memory (PROM), Erasable Programmable Read-Only Memory (EPROM), One-time Programmable Read-Only Memory (OTPROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), compact disc-Read-Only Memory (CD-ROM), or other Memory, magnetic disk, magnetic tape, or magnetic tape, Or any other medium which can be used to carry or store data and which can be read by a computer.
The embodiments of the present invention are described in detail with reference to the accompanying drawings, and in view of how to reduce the frostless defrosting time in the related art, the present invention provides a new defrosting control scheme, in which the difference between the exhaust temperature and the cold temperature is determined as a defrosting trend temperature by collecting the cold outlet temperature of the outdoor heat exchanger flow path and the exhaust temperature of the compressor, the defrosting trend temperature represents the heat energy released by cooling the refrigerant in the heat exchanger, so that when the heat release amount of the refrigerant required by defrosting of the heat exchanger is detected to be increased after entering the next cycle or kept as usual before, it indicates that the defrosting operation is not completed, and when the heat release amount of the refrigerant required by defrosting of the heat exchanger is detected to be gradually increased or decreased, it indicates that the defrosting operation is nearly completed, and at this time, the corresponding defrosting operation step can be determined according to the trend relationship to realize the controllability of the defrosting operation, the probability that the defrosting operation is still executed after the defrosting of the air conditioner outdoor unit is finished is reduced, and therefore energy attenuation caused by the defrosting operation without the defrosting operation is reduced.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (12)
1. A defrosting control method is suitable for an air conditioner outdoor unit, the air conditioner outdoor unit comprises a compressor and an outdoor heat exchanger, and the defrosting control method comprises the following steps:
after the defrosting mode is detected, respectively detecting the cold outlet temperature in the flow path of the outdoor heat exchanger and the exhaust temperature of the compressor according to a preset detection period;
determining a corresponding defrosting trend temperature difference according to the exhaust temperature and the cold-out temperature detected in each detection period;
detecting the trend relationship between the first defrosting trend temperature difference and the second defrosting trend temperature difference so as to execute subsequent defrosting operation according to the trend relationship,
the first defrosting trend temperature difference is the defrosting trend temperature difference determined after the current detection period is finished, and the second defrosting temperature difference is the defrosting trend temperature difference determined after the last detection period is finished;
the method for detecting the cold outlet temperature in the flow path of the outdoor heat exchanger specifically comprises the following steps:
respectively and synchronously acquiring real-time refrigerant temperatures at a plurality of flow path outlets of the outdoor heat exchanger;
and determining the refrigerant temperature with the minimum temperature value as the cold outlet temperature.
2. The defrosting control method according to claim 1, wherein the detecting a trend relationship between the first defrosting trend temperature difference and the second defrosting trend temperature difference for performing a subsequent defrosting operation according to the trend relationship comprises the following steps:
when the first defrosting trend temperature difference is smaller than the second defrosting trend temperature difference, detecting a temperature difference relation between the first defrosting trend temperature difference and a preset temperature difference threshold value so as to determine whether to continue defrosting operation or not according to the temperature difference relation;
and when the first defrosting trend temperature difference is detected to be greater than or equal to the second defrosting trend temperature difference, controlling to continue to execute the defrosting operation so as to detect the trend relationship again after the duration of the detection period continues to pass.
3. The defrosting control method according to claim 2, wherein the determining whether to continue the defrosting operation according to the temperature difference relationship specifically includes the following steps:
when the first defrosting trend temperature difference is detected to be smaller than the preset temperature difference threshold value, collecting the temperature of a refrigerant at the appointed position of the middle area on the flow path of the outdoor heat exchanger to serve as the middle temperature;
when the cold medium temperature is detected to be greater than a preset temperature threshold value, controlling to end the defrosting operation;
and when the cold temperature is detected to be less than or equal to the preset temperature threshold value, controlling to continuously execute defrosting operation.
4. The defrosting control method according to claim 3, further comprising:
and when the first defrosting trend temperature difference is detected to be larger than or equal to the preset temperature difference threshold value, controlling to continuously execute defrosting operation.
5. The defrosting control method according to claim 3 or 4, wherein before the detecting enters the defrosting mode, the method further comprises:
collecting the ambient temperature of the air conditioner outdoor unit;
correcting a pre-stored temperature difference threshold value according to the environment temperature to obtain the preset temperature difference threshold value; and/or
And correcting a pre-stored temperature threshold value according to the environment temperature to obtain the preset temperature threshold value.
6. A defrosting control device is suitable for an air conditioner outdoor unit, the air conditioner outdoor unit comprises a compressor and an outdoor heat exchanger, and the defrosting control device is characterized by comprising:
a detection unit for detecting the cold outlet temperature in the outdoor heat exchanger flow path and the discharge temperature of the compressor in each period according to a preset detection period after the defrosting mode is detected to be entered
A determination unit configured to determine correspondence from the exhaust temperature detected in each of the detection cycles and the cool-out temperature;
the detection unit is further configured to: detecting the trend relationship between the first defrosting trend temperature difference and the second defrosting trend temperature difference so as to execute subsequent defrosting operation according to the trend relationship,
the first defrosting trend temperature difference is the defrosting trend temperature difference determined after the current detection period is finished, and the second defrosting temperature difference is the defrosting trend temperature difference determined after the last detection period is finished;
further comprising:
the acquisition unit is used for respectively and synchronously acquiring the real-time refrigerant temperatures at the outlets of the plurality of flow paths of the outdoor heat exchanger;
the determination unit is further configured to: and determining the refrigerant temperature with the minimum temperature value as the cold outlet temperature.
7. The defrosting control apparatus of claim 6,
the detection unit is further configured to: when the first defrosting trend temperature difference is smaller than the second defrosting trend temperature difference, detecting a temperature difference relation between the first defrosting trend temperature difference and a preset temperature difference threshold value so as to determine whether to execute defrosting operation according to the temperature difference relation;
and when the first defrosting trend temperature difference is detected to be greater than or equal to the second defrosting trend temperature difference, controlling to continue to execute the defrosting operation so as to detect the trend relationship again after the duration of the detection period continues to pass.
8. The defrosting control apparatus of claim 7,
the acquisition unit is further configured to: when the first defrosting trend temperature difference is detected to be smaller than the preset temperature difference threshold value, collecting the temperature of a refrigerant at the appointed position of the middle area on the flow path of the outdoor heat exchanger to serve as the middle temperature;
the defrosting control device further includes:
the control unit is used for controlling the defrosting operation to be finished when the cold medium temperature is detected to be greater than a preset temperature threshold value;
the control unit is further configured to: and when the cold temperature is detected to be less than or equal to the preset temperature threshold value, controlling to continuously execute defrosting operation.
9. The defrosting control apparatus of claim 8,
the control unit is further configured to: and when the first defrosting trend temperature difference is detected to be larger than or equal to the preset temperature difference threshold value, controlling to continuously execute defrosting operation.
10. The defrosting control apparatus according to claim 8 or 9,
the acquisition unit is further configured to: collecting the ambient temperature of the air conditioner outdoor unit;
the defrosting control device further includes:
the correcting unit is used for correcting a pre-stored temperature difference threshold value according to the environment temperature so as to obtain the preset temperature difference threshold value; and/or
The correction unit is further configured to: and correcting a pre-stored temperature threshold value according to the environment temperature to obtain the preset temperature threshold value.
11. An air conditioner comprising a processor for implementing the steps of the method according to any one of claims 1-5 when executing a computer program stored in a memory.
12. A computer-readable storage medium having stored thereon a computer program (instructions), characterized in that: the computer program (instructions), when executed by a processor, implement the steps of the method according to any one of claims 1 to 6.
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| CN110469960B (en) * | 2019-07-24 | 2022-09-06 | 青岛海尔空调器有限总公司 | Control method and device for defrosting of air conditioner and air conditioner |
| CN110469961B (en) * | 2019-07-24 | 2022-09-06 | 青岛海尔空调器有限总公司 | Control method and device for defrosting of air conditioner and air conditioner |
| CN110469962B (en) * | 2019-07-24 | 2022-12-20 | 青岛海尔空调器有限总公司 | Control method and device for defrosting of air conditioner and air conditioner |
| CN113340029A (en) * | 2020-03-03 | 2021-09-03 | 青岛海尔空调电子有限公司 | Defrosting control method for air conditioner |
| CN112923516A (en) * | 2021-03-24 | 2021-06-08 | 广东积微科技有限公司 | Air conditioner and defrosting control method |
| CN114251896A (en) * | 2021-12-24 | 2022-03-29 | 海信（山东）冰箱有限公司 | Refrigerator and defrosting control method thereof |
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