CN113847709A - Outdoor unit defrosting control device and control method of air conditioner and air conditioner - Google Patents
Outdoor unit defrosting control device and control method of air conditioner and air conditioner Download PDFInfo
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- CN113847709A CN113847709A CN202111284885.9A CN202111284885A CN113847709A CN 113847709 A CN113847709 A CN 113847709A CN 202111284885 A CN202111284885 A CN 202111284885A CN 113847709 A CN113847709 A CN 113847709A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
- F24F11/42—Defrosting; Preventing freezing of outdoor units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/87—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units
- F24F11/871—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units by controlling outdoor fans
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The invention provides an outdoor unit defrosting control device of an air conditioner, a control method and the air conditioner, wherein the outdoor unit defrosting control device comprises: a temperature sensor for detecting an outdoor ambient temperature T1; the current acquisition module is used for acquiring current data of an outdoor fan of the outdoor unit; the data processing module is used for calculating the ratio A of the current average values I1 and I2 in two different time periods to be I1/I2 according to the current data acquired by the current acquisition module; and the defrosting control module controls the air conditioner to enter a defrosting mode according to the outdoor environment temperature T1 and the ratio A. Compared with the method of detecting the temperature of the coil of the outdoor unit, the method has the advantages that the current data are more stable and reliable, the temperature of the outdoor unit and the frosting condition of the outdoor unit can be truly reflected, the defrosting mode can be more accurately controlled, and the reliable operation of an air conditioner system is guaranteed.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an outdoor unit defrosting control device and method of an air conditioner and the air conditioner.
Background
In the heating mode of the air conditioner, when the surface temperature of the outdoor unit is lower than the dew point temperature of air and lower than 0 ℃, frosting can occur, the heat exchange performance of the air conditioner and the use comfort of a user are influenced, and when the surface temperature of the outdoor unit is serious, a partially melted frost layer is frozen into ice and can collide with an outdoor fan, so that fan blades are damaged, and the normal use of the air conditioner is influenced.
In order to monitor the outdoor unit frosting phenomenon, a temperature sensor is generally installed on a coil of the outdoor unit of the conventional air conditioner to detect the temperature of the coil of the outdoor unit, and the frosting condition of the outdoor unit is judged according to the temperature of the coil, that is, when the temperature of the coil reflected by the temperature sensor is lower than a certain value, the outdoor unit is judged to have the frosting phenomenon, and the air conditioner enters a defrosting mode to defrost the outdoor unit.
However, this monitoring method only uses the coil temperature as the judgment condition for defrosting or not, and has a great disadvantage that the accuracy of this monitoring method depends on the accuracy of the measured coil temperature; when the coil temperature is not in accordance with the actual outdoor unit temperature, misjudgment may occur. When refrigerant shunt is not uniform in the coil pipe of the outdoor unit or the coil pipe probe is loosened, the measured temperature cannot accurately reflect the real temperature of the outdoor unit, so that the frosting condition of the outdoor unit cannot be reflected, the condition that the outdoor unit enters the defrosting mode only when the frost layer is thick sometimes occurs, the running stability of the air conditioner is influenced, even the outdoor unit does not frost and enters the defrosting mode, the normal heating operation is interrupted due to entering the defrosting mode, and the comfort experience of a user is influenced.
Therefore, it is desirable to provide a defrosting method for an outdoor unit, which can improve the accuracy of predicting or determining a frosting event, so as to enter a defrosting mode more timely.
Disclosure of Invention
In order to solve the problems, the invention provides an outdoor unit defrosting control device and method of an air conditioner and the air conditioner, which solve the technical problem that in the prior art, the defrosting condition is judged depending on the temperature of a coil, and the temperature of the coil cannot truly reflect the temperature and the defrosting condition of the outdoor unit, so that the defrosting judgment is inaccurate.
In order to solve the above problems, the present invention provides an outdoor unit defrosting control device of an air conditioner, including:
a temperature sensor for detecting an outdoor ambient temperature T1;
the current acquisition module is used for acquiring current data of an outdoor fan of the outdoor unit;
the data processing module is used for calculating the ratio A of the current average values I1 and I2 in two different time periods to be I1/I2 according to the current data acquired by the current acquisition module;
and the defrosting control module controls the air conditioner to enter a defrosting mode according to the outdoor environment temperature T1 and the ratio A.
According to the technical scheme, the frosting of the outdoor unit leads to the increase of the resistance of the rotation of the fan blades of the outdoor fan, so that the load of the outdoor fan is increased, the power of the outdoor fan is increased when the voltage is constant, the current is also increased, and therefore the frosting condition of the outdoor unit can be accurately reflected by detecting the current data of the outdoor fan and according to the ratio of the current average values in different time periods. When the air conditioner is frosted, the current gradually increases along with the increase of time, the current average value also increases, the ratio of the current average value is the ratio of the current average value I1 in the previous time period to the current average value I2 in the later time period, namely, the ratio of the current average value decreases along with the increase of time, and the air conditioner is controlled to enter a defrosting mode. Compared with the method for judging whether frosting occurs or not by detecting the temperature of the coil pipe of the outdoor unit, the current data is more stable and reliable, the temperature of the outdoor unit and the frosting condition of the outdoor unit can be truly reflected, then the defrosting mode can be more accurately controlled, and the reliable operation of an air conditioner system is ensured.
According to the technical scheme, the defrosting control module controls the air conditioner to enter a defrosting mode when the outdoor environment temperature range is more than 0 ℃ and less than or equal to T1 and less than or equal to T0 and A is less than or equal to a; and when the range of the outdoor environment temperature is T1 not more than 0 ℃ and A not more than b, the defrosting control module controls the air conditioner to enter a defrosting mode, wherein a is less than b.
According to the technical scheme, when the temperature is higher than zero, a strict condition of the ratio A is set for entering the defrosting mode, and a looser condition of the ratio A is set under the condition that the temperature is reduced below zero, namely, the problem of frost is easily generated, so that different threshold values for entering the defrosting mode are flexibly set according to actual frost at different outdoor environment temperatures, and the energy consumption loss caused by misoperation of the defrosting control module or the condition that the defrosting mode is entered when the frost layer is too thick is reduced, and the difficulty in removing is eliminated.
According to the technical scheme, the defrosting time calculating module is further included, and the duration time of the air conditioner entering the defrosting mode is calculated according to the outdoor environment temperature T1 and the ratio A.
According to the technical scheme, the defrosting time is related to the ratio of the outdoor environment temperature to the current average value, and through the method, the defrosting time can be accurately calculated, and the defrosting mode can be accurately entered or exited; the defrosting time is prevented from being too long, unnecessary energy consumption is avoided, and the defrosting time is also prevented from being short, so that the defrosting is not clean.
According to this solution, the duration T is c (100 × (1-a) -T1) + g (a), where c is a predetermined parameter and g (a) is a function related to the ratio a.
According to the technical scheme, the duration of entering the defrosting mode is related to the ratio A of the average value of the current, and as the current is continuously changed along with the thickness of the frost layer in the defrosting process, the thicker the frost layer is, the larger the current is, and the longer the defrosting time is needed. The duration time is set according to the ratio of the current average value, so that the defrosting time can be set more accurately, and the energy consumption and the defrosting effect are taken into consideration. In some technical solutions, the duration can also be changed in real time according to the ratio a, the duration can be dynamic data instead of fixed interval time, the ratio a is associated with the thickness of the frost layer, the smaller the ratio a is, the thicker the frost layer is, the larger the ratio a is, the ratio a tends to 1, the thinner the frost layer is, that is, the frost layers with different thicknesses can correspond to different durations, and the accuracy of the duration for entering the defrosting mode is improved. Further, the duration of entering the defrosting mode is correlated with the outdoor environment temperature T1, and when the outdoor environment temperature is low, the defrosting speed is slow, the duration is long, and when the outdoor environment is high, the defrosting speed is fast, and the duration is short. Through the mode, the duration of entering the defrosting mode can be updated in real time according to the outdoor environment temperature and the ratio A, the defrosting process is accurately controlled, the duration is adjusted in real time according to the defrosting condition, and the condition that the defrosting is not clean due to too short defrosting time or the normal use of the air conditioner is influenced due to too long defrosting time is avoided.
According to this solution, the operation of the current acquisition module is responsive to the following conditions: the air conditioner operates in a heating mode, the outdoor fan is operated at a prescribed gear or rotational speed, and the compressor is started and operated for a prescribed period of time.
According to the technical scheme, after the compressor is started and operated for a specified time, and the outdoor fan runs at a specified gear or rotating speed, the current data of the outdoor fan after the air conditioner stably runs can be acquired, the accuracy of the acquired current data is improved, the frosting condition of the outdoor unit is further accurately judged, and therefore the air conditioner is accurately controlled to enter the defrosting mode.
According to the technical scheme, the two different time periods corresponding to the current average values I1 and I2 are two time periods with equal time intervals of one or more times of specified time intervals.
The invention also provides an outdoor unit defrosting control method of the air conditioner, which comprises the following steps:
a temperature detection step of detecting outdoor environment temperature;
a current acquisition step of acquiring current data of an outdoor fan of an outdoor unit;
a data processing step of calculating a ratio a of current average values I1, I2 in two different time periods I1/I2 from the current data acquired in the current acquisition step;
and a defrosting control step, controlling the air conditioner to enter a defrosting mode according to the outdoor environment temperature T1 and the ratio A.
According to the technical scheme, the method further comprises the following steps:
and a defrosting time calculating step, namely calculating the duration of the air conditioner entering the defrosting mode according to the outdoor environment temperature T1 and the ratio A.
According to the technical scheme, the air conditioner finishes defrosting and enters the heating mode after entering the defrosting mode for a duration, and executes the defrosting control step again after entering the heating mode and running for a specified time.
According to the technical scheme, the heating mode and the defrosting mode are circularly and alternately carried out, the outdoor unit can be defrosted in time, and the running reliability of the air conditioner is ensured.
The invention also provides an air conditioner with the outdoor unit defrosting control device.
Drawings
Fig. 1 is a schematic structural view of an outdoor unit defrosting control device of an air conditioner according to a first embodiment of the present invention.
Fig. 2 is a flowchart illustrating an outdoor unit defrosting control method of an air conditioner according to a first embodiment of the present invention.
Fig. 3 is a schematic structural diagram of an outdoor unit defrosting control device of an air conditioner according to a second embodiment of the present invention.
Fig. 4 is a flowchart illustrating an outdoor unit defrosting control method of an air conditioner according to a second embodiment of the present invention.
Reference numerals:
an outdoor unit defrosting control device 1; a temperature sensor 11; a current acquisition module 12; a data processing module 13; a defrost control module 14; and a defrosting time calculating module 15.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
[ first embodiment ] to provide a liquid crystal display device
Fig. 1 is a schematic structural view of an outdoor unit defrosting control device of an air conditioner according to a first embodiment of the present invention. Referring to fig. 1, the present invention provides an outdoor unit defrosting control device 1 of an air conditioner, including:
a temperature sensor 11, for example, a temperature sensor 11 disposed at an air inlet of the outdoor unit, for detecting an outdoor ambient temperature T1;
a current obtaining module 12, such as a module communicatively connected to a control circuit board of the outdoor unit or a current measuring device connected in series to the outdoor fan driving circuit, wherein the current obtaining module 12 is configured to obtain current data of an outdoor fan (not shown) of the outdoor unit (not shown), in particular, current value data of the fan driving circuit changing with time;
the data processing module 13 is, for example, a data processing module 13 disposed on a control circuit board of the outdoor unit or in the air conditioner control system, the data processing module 13 is in communication connection with the temperature sensor 11 and the current acquisition module 12, respectively, and is capable of calculating a ratio a of current average values I1 and I2 in two different time periods, I1/I2, according to the current data acquired by the current acquisition module 12;
the defrosting control module 14, for example, a defrosting control module 14 disposed in a control circuit board of the outdoor unit and a control system of the air conditioner, the defrosting control module 14 is connected to the data processing module 13 in communication, and may also be connected to the temperature sensor 11 in communication, so as to control the air conditioner to enter a defrosting mode according to the outdoor environment temperature T1 and the ratio a.
In this way, the frosting of the outdoor unit leads to the increase of the resistance of the fan blade rotation of the outdoor fan, and then leads to the increase of the load of the outdoor fan, the power is increased, when the voltage is constant, the power of the outdoor fan is increased, and the current is also increased, so that the frosting condition of the outdoor unit can be accurately reflected by detecting the current data of the outdoor fan and according to the ratio of the current average values of different time periods. When the air conditioner is frosted, the current gradually increases along with the increase of time, the current average value also increases, the ratio of the current average value is the ratio of the current average value I1 of the previous time period to the current average value I2 of the later time period, namely, the ratio of the current average value decreases along with the increase of time, and when the ratio A of the current average value decreases below a threshold value, the air conditioner is controlled to enter a defrosting mode. Compared with the method of detecting the temperature of the coil of the outdoor unit, the method has the advantages that the current data are more stable and reliable, the temperature of the outdoor unit and the frosting condition of the outdoor unit can be reflected more truly, the defrosting mode can be controlled to enter more accurately, and the reliable operation of an air conditioner system is guaranteed. In some embodiments, the operation mode of determining to enter the defrosting mode by using the ratio a may be used in combination with an existing mode of detecting the temperature of the outdoor unit coil, so as to further improve the accuracy of predicting or determining the occurrence of the frosting event.
In the preferred embodiment of the present invention, the defrosting control module 14 controls the air conditioner to enter the defrosting mode when the outdoor environment temperature is in the range of 0 ℃ < T1 ≦ T0, and A ≦ a; and when the range of the outdoor environment temperature is T1 not more than 0 ℃ and A not more than b, the defrosting control module controls the air conditioner to enter a defrosting mode, wherein a is less than b.
By the aid of the mode, the air conditioner can be controlled to enter the defrosting mode under different outdoor temperature ranges and different current average value ratio conditions, flexibility of the air conditioner entering the defrosting mode is improved, the air conditioner can enter the defrosting mode when the temperature is too low or the current average value ratio is too small, and defrosting timeliness of the outdoor unit is improved. In the specific embodiment of the invention, T0 is 10 ℃, a is 0.85, b is 0.9, namely when the outdoor environment temperature is 0-10 ℃ and the ratio A is less than or equal to 0.85, the air conditioner is controlled to enter the defrosting mode, and when the outdoor environment temperature is less than 0 ℃, the ratio A is less than or equal to 0.9, the air conditioner is controlled to enter the defrosting mode. When the outdoor environment temperature is above 0 ℃, the defrosting mode can be delayed, and the energy consumption loss of the defrosting control module caused by misoperation is reduced; when the temperature is lower than 0 ℃, the defrosting mode needs to be started as soon as possible, and the phenomenon that the frost layer is gradually thickened and is difficult to remove due to too low outdoor environment temperature is avoided.
In a preferred embodiment of the present invention, the operation of the current acquisition module 12 is responsive to the following conditions: the air conditioner operates in a heating mode, the outdoor fan is operated at a prescribed gear or rotational speed, and the compressor is started and operated for a prescribed period of time.
By the mode, after the compressor is started and operated for the specified time, and the outdoor fan runs at the specified gear or rotating speed, the current data of the outdoor fan after the air conditioner stably runs can be acquired, the accuracy of the acquired current data is improved, the frosting condition of the outdoor unit is further accurately judged, and the air conditioner is accurately controlled to enter the defrosting mode. In the specific embodiment of the invention, after the compressor runs for 30min, the current of the outdoor fan is acquired in real time.
In a preferred embodiment of the present invention, the two different time periods corresponding to the current average values I1, I2 are two time periods having the same time length separated by a single or multiple of the predetermined time length.
Specifically, the "specified duration" actually refers to a sampling frequency, that is, sampling is performed once every specified duration, "every single or multiple specified durations" refers to a total sampling duration, "a time period in which two durations are equal," refers to a total sampling duration of two current average values being the same, and the sampling frequency is also fixed in the case that the total sampling duration and the sampling frequency are determined.
In the specific embodiment of the invention, the total sampling time is preferably 20min, the sampling frequency is that current values are obtained once every 30s, 40 current values are obtained totally, the maximum value and the minimum value are removed from the 40 current values, and the average value of 38 current values is calculated and recorded as I1; the average value of the current is calculated by adopting a mode of eliminating the maximum value and the minimum value, so that the fluctuation error of the sampled current under the influence of the external environment can be reduced, and the accuracy of the current data and the average value of the current is improved. In the invention, two different time periods corresponding to the currents I1 and I2 can be partially overlapped time periods, that is, the current average value I1 is the average value of the currents after the maximum value and the minimum value are removed from the 1 st sampling to the 40 th sampling, the current average value I2 is the average value of the currents after the maximum value and the minimum value are removed from the 2 nd sampling to the 41 th sampling, and a is I1/I2; i3 is the average value of the currents after the maximum value and the minimum value are removed from the 3 rd sampling to the 42 th sampling, and a is I1/I3; the time interval difference between every two current average values is short, and the ratio change of the current average values of the outdoor fan can be reflected in real time, so that the frosting degree of the outdoor unit is known, and the frosting judgment accuracy is improved. Once the outdoor unit frosts, the frosting judgment timeliness is improved by monitoring the frosting through the ratio change of the current average value.
Through the mode, the current value is obtained at the same time interval in the time period with the same duration, so that the sampling times of the current average values I1 and I2 are equal, preferably, the sampling times are 40, the sampling times are guaranteed, the reliability of the sampled current value is guaranteed, the accuracy of calculating the current average value is improved, and the accuracy of defrosting judgment is improved.
Fig. 2 is a flowchart illustrating an outdoor unit defrosting control method of an air conditioner according to a first embodiment of the present invention. Referring to fig. 2, an outdoor unit defrosting control method according to a first embodiment of the present invention includes the following steps:
a temperature detection step of detecting outdoor environment temperature;
a current acquisition step of acquiring current data of an outdoor fan of an outdoor unit;
a data processing step of calculating a ratio a of current average values I1, I2 in two different time periods I1/I2 from the current data acquired in the current acquisition step;
and a defrosting control step, controlling the air conditioner to enter a defrosting mode according to the outdoor environment temperature T1 and the ratio A.
In the specific embodiment of the invention, the temperature detection step is realized by a temperature sensor 11, the current acquisition step is realized by a current acquisition module 12, the data processing step is finished by a data processing module 13, and the defrosting control step is finished by a defrosting control module 14; at least one of the current acquisition module 12, the data processing module 13 and the defrosting control module 14 according to the embodiment of the present invention may be integrated in a control system of an air conditioner.
Further, before the temperature detection step, the method also comprises a step of obtaining an operation mode of the air conditioner, and when the air conditioner operates in a heating mode, the steps of temperature detection, current obtaining, data processing and defrosting control are carried out.
[ second embodiment ]
Fig. 3 is a schematic structural diagram of an outdoor unit defrosting control device of an air conditioner according to a second embodiment of the present invention. A second embodiment of the present invention provides an outdoor unit defrosting control device of an air conditioner, which is different from the first embodiment in that the outdoor unit defrosting control device of the air conditioner according to the second embodiment of the present invention further includes: and the defrosting time calculating module 15 calculates the duration of the air conditioner entering the defrosting mode according to the outdoor environment temperature T1 and the ratio A.
By the mode, the defrosting time is related to the outdoor environment temperature and the current average value, so that different defrosting times correspond to different outdoor environment temperatures and different current average values, the defrosting time can be accurately calculated under different conditions, and the defrosting mode can be accurately entered or exited; the defrosting time is prevented from being too long, unnecessary energy consumption is avoided, and the defrosting time is also prevented from being short, so that the defrosting is not clean.
In particular, duration T ═ c (100 × (1-a) -T1) + g (a), where c is a preset parameter and g (a) is a function related to ratio a; and when t is not an integer, taking the integer to be larger so as to ensure that the defrosting is clean.
Through the mode, the duration of entering the defrosting mode is associated with the ratio A of the average value of the current, the current is continuously changed along with the thickness of the frost layer in the defrosting process, so that the duration can be changed in real time according to the ratio A, the duration is dynamic data instead of fixed interval time, the ratio A is associated with the thickness of the frost layer, the smaller the ratio A is, the thicker the frost layer is represented, the larger the ratio A is and tends to 1, the thinner the frost layer is represented, namely, the frost layers with different thicknesses can correspond to different durations, and the accuracy of the duration of entering the defrosting mode is improved. Further, the duration of entering the defrosting mode is related to the outdoor environment temperature T1, when the outdoor environment temperature is low, the defrosting speed is slow, the duration is long, and when the outdoor environment is high, the defrosting speed is fast, and the duration is short; through the mode, the duration of entering the defrosting mode can be updated in real time according to the outdoor environment temperature and the ratio A, the defrosting process is accurately controlled, the duration is adjusted in real time according to the defrosting condition, and the condition that the defrosting is not clean due to too short defrosting time or the normal use of the air conditioner is influenced due to too long defrosting time is avoided.
Specifically, the relationship between the duration time T and the ratio a of the outdoor ambient temperature T1 and the current average value can be obtained through experiments, for example, in the case of a certain T1, the functional relationship between the ratio a and the duration time T can be obtained by fitting different current average values and the actually required defrosting time in a coordinate system.
g (a) is a correction function, when the air conditioner runs for a duration time, the outdoor unit surface still has a large amount of frost layers or no frost layers on the outdoor unit surface, but the air conditioner is still in a defrosting mode, it indicates that there is an error between the duration time obtained by calculation according to the ratio a of the outdoor environment temperature T1 and the current average value and the actually required defrosting time, the error between the duration time and the actually required defrosting time can be compared through further experiments, and a function g (a) related to the ratio a is obtained through data fitting to correct the error between the duration time and the time required defrosting time, so that the calculation of the duration time is closer to the actually required defrosting time, and the air conditioner is prevented from running in the defrosting mode for a long time or is not defrosted cleanly. When the actually needed defrosting time is basically consistent with the duration time, no correction is needed, and g (A) is a constant of 0.
Fig. 4 is a flowchart illustrating a defrosting control method for an outdoor unit of an air conditioner according to a second embodiment of the present invention, referring to fig. 4, the defrosting control method for the outdoor unit of the air conditioner according to the second embodiment of the present invention further includes the following steps:
and a defrosting time calculating step, namely calculating the duration of the air conditioner entering the defrosting mode according to the outdoor environment temperature T1 and the ratio A.
Further, in a preferred embodiment of the present invention, the air conditioner ends defrosting and enters the heating mode after entering the defrosting mode for a duration, and performs the defrosting control step again after entering the heating mode for a prescribed time period.
By the mode, the heating mode and the defrosting mode are circularly and alternately carried out, and the heating mode is entered after defrosting is finished, so that the heating requirement of a user is ensured; when the outdoor unit frosts after the heating mode is operated for a set time, the temperature detection step, the current acquisition step, the data processing step and the defrosting control step in the outdoor unit defrosting control method are executed again, the frosting condition of the outdoor unit can be judged in time, the air conditioner is controlled to enter the defrosting mode, and the operation reliability of the air conditioner is ensured.
According to the embodiment of the invention, by detecting the current operation mode of the air conditioner, when the operation mode is a heating mode, according to outdoor fan current data obtained in real time and according to current values at different moments, after the maximum and minimum values are removed, the current average value and the ratio of the current average value are calculated, so that the air conditioner is controlled to enter a defrosting mode according to the real-time condition, the time required by defrosting is calculated, the defrosting of the air conditioner is intelligently and precisely controlled, and the air conditioner is enabled to operate in a better state all the time; the embodiment of the invention can independently control the defrosting of the outdoor unit, and can also be compatible with the old outdoor defrosting control method and complement each other.
The embodiment of the invention also provides an air conditioner, which is provided with the defrosting control device of the outdoor unit.
The air conditioner provided by the embodiment of the invention can control the air conditioner to enter the defrosting mode according to the ratio change of the current average value, so that the accuracy of defrosting judgment is improved, and the timeliness of defrosting is ensured.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An outdoor unit defrosting control apparatus of an air conditioner, comprising:
a temperature sensor for detecting an outdoor ambient temperature T1;
the current acquisition module is used for acquiring current data of an outdoor fan of the outdoor unit;
the data processing module is used for calculating the ratio A of the current average values I1 and I2 in two different time periods to be I1/I2 according to the current data acquired by the current acquisition module;
and the defrosting control module controls the air conditioner to enter a defrosting mode according to the outdoor environment temperature T1 and the ratio A.
2. The outdoor unit defrosting control apparatus of claim 1, wherein,
the defrosting control module controls the air conditioner to enter a defrosting mode when the range of the outdoor environment temperature is more than 0 ℃ and less than or equal to T1 and less than or equal to T0 and A is less than or equal to a;
and the defrosting control module controls the air conditioner to enter a defrosting mode when the outdoor environment temperature is within the range of T1 being less than or equal to 0 ℃ and A being less than or equal to b, wherein a is less than b.
3. Defrost control apparatus according to claim 1 or 2, further comprising
And the defrosting time calculating module is used for calculating the duration of the air conditioner entering the defrosting mode according to the outdoor environment temperature T1 and the ratio A.
4. Defrost control apparatus in accordance with claim 3 wherein the duration T ═ c (100 x (1-a) -T1) + g (a), where c is a predetermined parameter and g (a) is a function related to the ratio a.
5. The defrost control of claim 1, wherein the operation of the current acquisition module is responsive to the following conditions: the air conditioner operates in a heating mode, the outdoor fan operates at a prescribed gear or rotational speed, and the compressor is started and operated for a prescribed period of time.
6. The defrost control apparatus of claim 1 wherein the two different time periods for the current averages I1, I2 are equal time periods separated by one or more prescribed time periods.
7. An outdoor unit defrosting control method of an air conditioner, the outdoor unit defrosting control method comprising the steps of:
a temperature detection step of detecting outdoor environment temperature;
a current acquisition step of acquiring current data of an outdoor fan of the outdoor unit;
a data processing step of calculating a ratio a of current average values I1, I2 in two different time periods I1/I2 from the current data acquired in the current acquisition step;
and a defrosting control step of controlling the air conditioner to enter a defrosting mode according to the outdoor environment temperature T1 and the ratio A.
8. The outdoor unit defrosting control method of claim 7, further comprising the steps of:
and a defrosting time calculating step of calculating the duration of the air conditioner entering a defrosting mode according to the outdoor environment temperature T1 and the ratio A.
9. The outdoor unit defrosting control method of claim 8, wherein the air conditioner finishes defrosting to enter the heating mode after entering the defrosting mode for the duration, and performs the defrosting control step again after entering the heating mode for a prescribed time period.
10. An air conditioner having the outdoor unit defrosting control unit of any one of claims 1 to 6.
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| CN114413416A (en) * | 2022-01-26 | 2022-04-29 | 宁波奥克斯电气股份有限公司 | Multi-split air conditioner defrosting control method, storage medium and multi-split air conditioner |
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