Defrosting control method and device of air conditioner and air conditioner

Abstract

The invention relates to the technical field of air conditioners, and provides a defrosting control method and device of an air conditioner and the air conditioner, and the defrosting control method of the air conditioner comprises the steps that the current coil pipe state is determined according to the current moment, the environment temperature, the coil pipe temperature, the air outlet temperature, the air speed gear and defrosting judgment conditions obtained in advance; when the current coil pipe state is the frosting state, a signal for operating a defrosting mode is sent out; and when the current coil pipe state is a non-frosting state, a signal for operating a heating mode is sent out. When the air conditioner judges whether the air conditioner enters the frosting state or not, the influences of the environment temperature and the coil pipe temperature are considered, frosting is verified through the environment temperature, the air outlet temperature of the outdoor unit and the air speed gear, the judged frosting state is more accurate, it can be avoided that the air conditioner enters the defrosting mode by mistake, a frost layer of the outdoor unit coil pipe can be eliminated in time, and the defrosting efficiency is improved. And the comfort of the user is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and in particular to a defrosting control method and a control device for an air conditioner, and an air conditioner. Background Art

[0002] When the air conditioning system is heating, the system sends heat from the outdoors to the indoors. When the outdoor ambient temperature is low and the humidity is high, the water vapor in the air will condense and frost on the surface of the outdoor heat exchanger. The frost on the outdoor heat exchanger increases the heat transfer resistance between the outdoor heat exchanger and the air, and increases the flow resistance when the airflow passes through the outdoor heat exchanger, which reduces the air flow through the outdoor heat exchanger and significantly reduces the heat exchange efficiency, which not only affects the indoor comfort, but also causes the system energy efficiency to decrease. In order to prevent this phenomenon, when the amount of frost on the outdoor heat exchanger exceeds a certain amount, it is necessary to run the defrost mode to eliminate the frost layer of the outdoor heat exchanger. In the related art, most air conditioners or air-cooled heat pump units use the heat exchange temperature of the fin heat exchanger and the ambient temperature to determine whether to enter and exit the defrost mode. This method is easy to misjudge when the unit fails, such as when the coil is blocked, and thus affects the defrosting of the unit. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the related art. To this end, the present invention proposes a defrost control method for an air conditioner, which, when determining whether an outdoor unit enters a frosting state in a heating mode, takes into account the influence of the outdoor ambient temperature and the coil temperature on the frosting of the outdoor unit coil, and verifies the frosting state by the ambient temperature and the air outlet temperature of the outdoor unit, so that the frosting state can be determined more accurately, which can not only eliminate the frost layer of the outdoor unit coil in time, but also avoid misjudgment of entering the defrosting mode, thereby improving the user's comfort.

[0004] The invention also provides a defrosting control device for an air conditioner.

[0005] The invention also provides an air conditioner.

[0006] According to a first aspect of the present invention, a defrost control method for an air conditioner is provided, comprising:

[0007] Obtaining the current time, the current outdoor ambient temperature, the coil temperature of the outdoor unit, the air outlet temperature of the outdoor unit, and the wind speed level of the outdoor unit, and determining the current coil state according to the current time, the ambient temperature, the coil temperature, the air outlet temperature, the wind speed level, and the pre-acquired defrosting judgment condition; wherein the current coil state includes a frosted state and a non-frosted state;

[0008] When the current coil state is the frosting state, sending a signal for running a defrost mode;

[0009] When the current coil state is the non-frosting state, a signal for operating a heating mode is sent.

[0010] According to one embodiment of the present invention, the defrost determination condition is obtained by the following steps:

[0011] Obtain the preset ambient temperature, preset coil temperature determination relationship, preset duration, preset temperature and maximum wind speed level;

[0012] Determining a first condition according to the preset ambient temperature, and determining a second condition according to the ambient temperature, the preset coil temperature determination relationship and the preset time length;

[0013] The defrost determination condition is:

[0014] The ambient temperature satisfies the first condition, and the current moment and the coil temperature satisfy the second condition, and the temperature difference between the outlet air temperature and the ambient temperature is less than or equal to the preset temperature, and the wind speed level is the maximum wind speed level.

[0015] According to one embodiment of the present invention, the defrost determination condition includes:

[0016] The ambient temperature is greater than a first preset ambient temperature, and the duration of the coil temperature being less than or equal to a first coil temperature determined by a determination relationship between the ambient temperature and the preset coil temperature is greater than or equal to a first preset duration, and the temperature difference between the outlet air temperature and the ambient temperature is less than or equal to a third temperature, and the wind speed gear is the maximum wind speed gear;

[0017] Or, the ambient temperature is between the first preset ambient temperature and the second preset ambient temperature, and the duration of the coil temperature being less than or equal to the second coil temperature determined by the determination relationship between the ambient temperature and the preset coil temperature is greater than or equal to the second preset duration, and the temperature difference between the outlet air temperature and the ambient temperature is less than or equal to a third temperature, and the wind speed gear is the maximum wind speed gear;

[0018] Or, the ambient temperature is between the second preset ambient temperature and the third preset ambient temperature, and the duration of the coil temperature being less than or equal to the third coil temperature determined by the determination relationship between the ambient temperature and the preset coil temperature is greater than or equal to the third preset duration, and the temperature difference between the outlet air temperature and the ambient temperature is less than or equal to the fifth temperature, and the wind speed gear is the maximum wind speed gear;

[0019] Or, the ambient temperature is between the third preset ambient temperature and the fourth preset ambient temperature, and the duration of the coil temperature being less than or equal to the fourth coil temperature determined by the determination relationship between the ambient temperature and the preset coil temperature is greater than or equal to the fourth preset duration, and the temperature difference between the outlet air temperature and the ambient temperature is less than or equal to the sixth temperature, and the wind speed gear is the maximum wind speed gear;

[0020] Among them, the first preset ambient temperature, the second preset ambient temperature, the third preset ambient temperature, and the fourth preset ambient temperature decrease in sequence.

[0021] According to one embodiment of the present invention, the method further includes:

[0022] In response to a signal for operating a heating mode, obtaining an outdoor ambient temperature;

[0023] The startup phase wind speed is determined according to the ambient temperature and the pre-acquired relationship between the wind speeds in the heating startup phase, and a signal is sent to control the outdoor unit to operate at the startup phase wind speed.

[0024] According to one embodiment of the present invention, the step of sending a signal to control the outdoor unit to run at the wind speed in the startup phase further includes:

[0025] Obtaining the low-pressure saturation temperature, and determining the wind speed compensation value at intervals of a sixth preset time after the compressor has been running for a fifth preset time at the current moment according to the ambient temperature, the low-pressure saturation temperature, and a pre-acquired wind speed compensation correspondence relationship;

[0026] The compensation wind speed is determined according to the wind speed compensation value and the wind speed in the startup phase, and a signal is sent to control the outdoor unit to operate at the compensation wind speed.

[0027] According to an embodiment of the present invention, the step of determining the wind speed compensation value according to the ambient temperature, the low pressure saturation temperature and the pre-acquired wind speed compensation correspondence relationship specifically includes:

[0028] When the difference between the ambient temperature and the low-pressure saturation temperature is greater than a fourth temperature condition, the wind speed compensation value is increased by a first preset gear;

[0029] When the difference between the ambient temperature and the low pressure saturation temperature is between the fourth temperature condition and the fifth temperature condition, the wind speed compensation value is zero;

[0030] When the difference between the ambient temperature and the low-pressure saturation temperature is less than the fifth temperature condition, the wind speed compensation value is reduced by a second preset gear.

[0031] According to one embodiment of the present invention, the method further includes:

[0032] The range of the wind speed level of the outdoor unit is determined according to the ambient temperature.

[0033] According to one embodiment of the present invention, the defrost determination condition is obtained by the following steps:

[0034] Get the start time of the compressor and the start time of the heating mode;

[0035] Determining a first operation duration according to the start time of the compressor and the current time, and determining a second operation duration according to the start time of the heating mode and the current time;

[0036] The defrost determination conditions include:

[0037] The first running time is longer than a seventh preset time, and the second running time is longer than an eighth preset time.

[0038] According to one embodiment of the present invention, the defrost determination condition is obtained by the following steps:

[0039] Acquire a start time of the heating mode, and determine a third operation time of the heating mode according to the start time of the heating mode and the current time;

[0040] The defrost determination condition is:

[0041] The duration for which the ambient temperature is less than or equal to the fifth preset ambient temperature and the coil temperature is less than the seventh temperature is greater than or equal to a ninth preset duration, and the third operating duration of the heating mode is greater than or equal to a tenth preset duration.

[0042] According to a second aspect of the present invention, a defrost control device for an air conditioner is provided, comprising:

[0043] An acquisition module, used to acquire the current time, the current outdoor ambient temperature, the coil temperature of the outdoor unit, the air outlet temperature of the outdoor unit, and the wind speed level of the outdoor unit, and determine the current coil state according to the current time, the ambient temperature, the coil temperature, the air outlet temperature, the wind speed level, and the pre-acquired defrosting judgment condition; wherein the current coil state includes a frosted state and a non-frosted state;

[0044] The signal sending module is used to send a signal for running a defrosting mode when the current coil state is the frosting state; and send a signal for running a heating mode when the current coil state is the non-frosting state.

[0045] According to an embodiment of the third aspect of the present invention, an air conditioner is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps of the defrost control method for the air conditioner provided in the embodiment of the first aspect of the present invention are implemented.

[0046] The above one or more technical solutions in the present invention have at least one of the following technical effects:

[0047] The defrost control method for an air conditioner provided in accordance with an embodiment of the present invention comprises the following steps: obtaining the current time, the current outdoor ambient temperature, the coil temperature of the outdoor unit, the air outlet temperature of the outdoor unit and the wind speed level of the outdoor unit, and determining the current coil state according to the current time, the ambient temperature, the coil temperature, the air outlet temperature, the wind speed level and the pre-acquired defrost judgment conditions; wherein the current coil state comprises a frosted state and a non-frosted state; when the current coil state is a frosted state, sending a signal to operate the defrost mode; and when the current coil state is a non-frosted state, sending a signal to operate the heating mode. When the air conditioner determines whether the outdoor unit coil enters a frosting state in the heating mode, the influence of the outdoor ambient temperature and the coil temperature on the frosting of the outdoor unit coil is considered, and the outdoor ambient temperature and the coil temperature are used as one of the judgment conditions. The frosting state is then verified by the ambient temperature and the outdoor unit's outlet air temperature, and the influence of the ambient temperature, the outdoor unit's outlet air temperature and the wind speed gear on frosting is used as the second judgment condition. The frosting state is judged more accurately, which can avoid misjudgment of entering the defrost mode, and can also eliminate the frost layer of the outdoor unit coil in time, thereby improving the user's comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0049] Figure 1 One of the flow charts of the defrost control method of the air conditioner provided by the embodiment of the present invention;

[0050] Figure 2 One of the flow charts of the defrost control method of the air conditioner provided by the embodiment of the present invention;

[0051] Figure 3 One of the flow charts of the defrost control method of the air conditioner provided by the embodiment of the present invention;

[0052] Figure 4 One of the flow charts of the defrost control method of the air conditioner provided by the embodiment of the present invention;

[0053] Figure 5 A schematic structural diagram of a defrost control device for an air conditioner provided in an embodiment of the present invention.

[0054] Reference numerals:

[0055] 501, acquisition module; 502, sending module. DETAILED DESCRIPTION

[0056] In order to make the purpose, technical solution and advantages of the invention clearer, the technical solution in the invention will be clearly described below in conjunction with the drawings in the invention. Obviously, the described embodiments are part of the embodiments of the invention, not all of the embodiments. Based on the embodiments in the invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the invention.

[0057] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0058] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0059] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0060] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0061] In the related art, air conditioners or air-cooled heat pump units mostly use the heat exchange temperature of the fin heat exchanger and the ambient temperature to determine whether to enter or exit the defrost mode. This method is prone to misjudgment when a unit malfunctions, such as coil blockage, occurs, thus affecting the defrosting of the unit.

[0062] The outdoor unit of the air conditioner provided in the embodiment of the present invention is provided with a fan, and the outdoor unit has multiple wind speed gears, for example, 21 gears. The fan speed is 0r / min at gear 0, and the maximum fan speed is 720r / min at gear 20.

[0063] According to the defrost control method of the air conditioner provided by the embodiment of the present invention, please refer to Figure 1 ,include:

[0064] In response to a signal for operating a heating mode, an outdoor ambient temperature is acquired.

[0065] The wind speed in the startup phase is determined according to the ambient temperature and the pre-acquired wind speed relationship in the heating startup phase, and a signal is sent to control the outdoor unit to operate at the wind speed in the startup phase.

[0066] It is understandable that the air conditioner can receive a signal for operating the heating mode input by the user through a remote controller or a control panel, and can also automatically generate a signal for operating the heating mode when the indoor and outdoor ambient temperatures meet preset conditions.

[0067] When the air conditioner is running in heating mode, the refrigerant in the coil of the outdoor unit exchanges heat with the outdoor air, and the coil temperature of the outdoor unit is relatively low. If the heat exchange efficiency between the outdoor air and the coil is low, the coil will quickly cool down to minus ten degrees Celsius under the action of the internal refrigerant, and the risk of frosting is high. When the ambient temperature is low, the risk of frosting on the outdoor unit coil is high. Therefore, during the startup phase of the air conditioner running in heating mode, the startup phase wind speed can be determined based on the ambient temperature and the pre-stored relationship between the wind speed in the heating startup phase. For example, when the ambient temperature is low, the wind speed gear of the outdoor unit is increased to improve the heat exchange efficiency between the air and the coil, avoid the outdoor unit coil from cooling down quickly under the action of the refrigerant in the tube and causing frost, extend the defrost cycle, avoid frequent defrosting that affects the indoor temperature, and avoid reducing the user experience.

[0068] In the embodiment of the present invention, the wind speed in the startup phase is determined according to the ambient temperature and the pre-acquired wind speed relationship in the heating startup phase. Figure 1 , specifically including the following steps:

[0069] S100: Obtain ambient temperature.

[0070] In step S100, the outdoor unit of the air conditioner is equipped with a temperature detection element, and the temperature detection element signal is connected to the controller. The controller can receive the ambient temperature signal and then determine the outdoor ambient temperature.

[0071] S110: Determine whether the ambient temperature is less than or equal to 15 degrees Celsius.

[0072] In step S110, if the ambient temperature is less than or equal to 15 degrees Celsius, it means that the ambient temperature is low at this time. The wind speed of the outdoor unit needs to be increased during the startup phase of the heating mode to prevent the temperature of the outdoor unit coil from dropping too quickly. At this time, step S120 is executed; if the ambient temperature is greater than 15 degrees Celsius, step S130 is executed.

[0073] S120, sending a signal to control the outdoor unit fan to operate at the 20th wind speed.

[0074] S130: Determine whether the ambient temperature is between 15 degrees Celsius and 20 degrees Celsius.

[0075] In step S130, if the ambient temperature is between 15 degrees Celsius and 20 degrees Celsius, the ambient temperature is high and the cooling rate of the coil is reduced, so the wind speed can be reduced during the startup phase, and step S140 is executed at this time; if not, step S150 is executed.

[0076] S140, sending a signal to control the outdoor unit fan to operate at the 13th gear wind speed.

[0077] S150: Determine whether the ambient temperature is between 20 degrees Celsius and 35 degrees Celsius.

[0078] In step S150, if the ambient temperature is between 20 degrees Celsius and 35 degrees Celsius, the ambient temperature is high, the cooling rate of the coil is low, and the wind speed can be appropriately reduced during the startup phase to save energy. At this time, step S160 is executed; if not, step S170 is executed.

[0079] S160, sends a signal to control the outdoor unit fan to run at 7 wind speeds.

[0080] S170, sending a signal to control the outdoor unit fan to operate at 4 wind speed levels.

[0081] The defrost control method for the air conditioner provided by the embodiment of the present invention determines the startup wind speed according to the ambient temperature during the heating startup phase, which can prevent the coil temperature of the outdoor unit from dropping too fast. However, during the heating startup phase, the state of the refrigerant in the coil is also changing, so during the heating startup phase, the wind speed gear of the outdoor unit fan can be further adjusted according to the ambient temperature and the low-pressure saturation temperature of the refrigerant in the coil.

[0082] In some embodiments, the step of sending a signal to control the outdoor unit to operate at the startup stage wind speed further includes:

[0083] Obtain the low-pressure saturation temperature, and at the current moment after the compressor has run for the fifth preset time, determine the wind speed compensation value at every sixth preset time based on the ambient temperature, the low-pressure saturation temperature and the pre-acquired wind speed compensation correspondence.

[0084] The compensation wind speed is determined according to the wind speed compensation value and the wind speed during the startup phase, and a signal is sent to control the outdoor unit to operate at the compensation wind speed.

[0085] It can be understood that after a period of time, such as 180 seconds, after the compressor is started, it is confirmed every time interval, such as 30 seconds, whether the wind speed of the outdoor unit needs to be compensated, and the wind speed compensation value is determined according to the ambient temperature, the low-pressure saturation temperature and the pre-stored wind speed compensation correspondence, and then the fan of the outdoor unit is controlled to run at the compensated wind speed.

[0086] See also Figure 2 , the above process includes the following steps:

[0087] S200, obtaining the ambient temperature, the low pressure saturation temperature and the current time.

[0088] In step S200, the outdoor unit of the air conditioner is equipped with a temperature detection element, and the temperature detection element signal is connected to the controller. The controller can receive the ambient temperature signal and then determine the outdoor ambient temperature.

[0089] S210, determining whether the current moment is after the fifth preset operation time of the compressor.

[0090] In step S210, if the current moment is after the fifth preset running time of the compressor, it means that the startup phase of the heating mode has begun to run, and it is necessary to further verify whether the outdoor unit wind speed gear matches the ambient temperature and the low-pressure saturation temperature at this time. At this time, run step S230, if not, run S220.

[0091] S220: Send a signal that the wind speed is compensated to be the current wind speed.

[0092] S230: Determine whether there is a recorded moment after the fifth preset time duration.

[0093] In step S230, in order to periodically adjust the wind speed of the outdoor unit, it is necessary to determine whether the time interval between the current moment and the last adjustment of the wind speed reaches the sixth preset time interval; if there is no recorded moment, execute step S240; if there is a recorded moment, execute step S250.

[0094] S240: Send a signal that the wind speed is compensated to be the current wind speed, and record the current time.

[0095] S250: Determine whether the difference between two adjacent current moments is greater than or equal to a sixth preset time length.

[0096] In step S250, if the difference between the current moments of two adjacent records is not greater than the sixth preset time length, it is necessary to wait and execute step S260; if the difference between the current moments of two adjacent records is greater than or equal to the sixth preset time length, execute step S270.

[0097] S260: Send a signal that the wind speed is compensated to be the current wind speed.

[0098] S270, determining a wind speed compensation value according to the ambient temperature, the low pressure saturation temperature and a pre-stored wind speed compensation correspondence, and recording the current time.

[0099] In step S270, a wind speed compensation value is determined according to the ambient temperature, the low pressure saturation temperature and the pre-stored wind speed compensation correspondence, and the wind speed compensation value is used as the basis for the current wind speed adjustment. After step S270, steps S280 and S290 are executed.

[0100] S280: Determine the compensation wind speed according to the wind speed compensation value and the wind speed in the startup phase.

[0101] S290, sends a signal to control the outdoor unit to compensate for the wind speed.

[0102] In some embodiments, the step of determining the wind speed compensation value according to the ambient temperature, the low pressure saturation temperature and the pre-acquired wind speed compensation correspondence relationship specifically includes the following contents:

[0103] When the difference between the ambient temperature and the low-pressure saturation temperature is greater than the fourth temperature condition, the wind speed compensation value is increased by the first preset gear.

[0104] When the difference between the ambient temperature and the low-pressure saturation temperature is between the fourth temperature condition and the fifth temperature condition, the wind speed compensation value is zero.

[0105] When the difference between the ambient temperature and the low-pressure saturation temperature is less than the fifth temperature condition, the wind speed compensation value is reduced by the second preset gear.

[0106] It should be noted that the fourth temperature condition is equal to the sum of the fourth temperature and another preset temperature. For example, the difference between the ambient temperature and the low pressure saturation temperature is Tps, ΔTps = Tps-5°C, then the following relationship exists:

[0107] When ΔTps>T4, the wind speed compensation value is increased by the first preset gear, for example, +1 gear;

[0108] When T5<ΔTps≤T4, the wind speed compensation value is zero;

[0109] When ΔTps≤T5, the wind speed compensation value is reduced by a second preset gear, for example, -1 gear.

[0110] The above contents are specific details of step S270, which can be executed according to the following logic:

[0111] S271. Determine whether the difference between the ambient temperature and the low-pressure saturation temperature is greater than a fourth temperature condition.

[0112] In step S271, if yes, execute step S272; if no, execute step S273.

[0113] S272: The wind speed compensation value is increased by a first preset gear, and a signal is sent to increase the first preset gear based on the current wind speed.

[0114] S273. Determine whether the wind speed compensation value is between the fourth temperature condition and the fifth temperature condition.

[0115] In step S273, if yes, execute step S274; if no, execute step S275.

[0116] S274: The wind speed compensation value is zero, and a signal is sent that the compensated wind speed is the current wind speed.

[0117] S275: The wind speed compensation value is reduced by a second preset gear, and a signal is sent to reduce the second preset gear based on the current wind speed.

[0118] In some embodiments, when compensating the wind speed of the outdoor unit, the effect of the ambient temperature on the frosting of the coil needs to be considered to avoid adjusting the wind speed of the outdoor unit too low. Therefore, the range of the wind speed of the outdoor unit needs to be determined according to the ambient temperature. For example, assuming that the ambient temperature is Ta, the following relationship exists:

[0119] When Ta is less than 7℃, the lowest gear is 18 and the highest gear is 20;

[0120] When 7℃<Ta≤20, the lowest gear is 13 and the highest gear is 20;

[0121] When Tao>20℃, the lowest gear is 1st gear and the highest gear is 20th gear.

[0122] According to the above content, when the outdoor ambient temperature changes, the risk of coil frost also changes. Setting the upper and lower limits of the wind speed level can reduce the occurrence of frost on the outdoor unit coil.

[0123] In some implementations, after the heating mode runs for a default time, the unit exits the heating startup phase, and the fan automatically adjusts the wind speed level according to environmental parameters, such as automatically adjusting according to the difference between the outlet air temperature and the ambient temperature. Figure 3 , including the following steps:

[0124] S300: Obtain air outlet temperature and ambient temperature.

[0125] S310: Calculate the difference between the wind temperature and the ambient temperature.

[0126] S320: Determine whether the difference between the outlet air temperature and the ambient temperature is greater than a second temperature.

[0127] If yes, execute step S330; if no, execute step S340.

[0128] S330, wind speed compensation value is reduced by 1 level;

[0129] S340: Determine whether the difference between the outlet air temperature and the ambient temperature is between the first temperature and the second temperature.

[0130] If yes, execute step S350; if no, execute step S360.

[0131] S350, the wind speed compensation value is zero.

[0132] S360, wind speed compensation value is increased by 1 level.

[0133] The above steps are steps for adjusting the wind speed in the heating stage in the defrost control method for the air conditioner provided in an embodiment of the present invention. During and after the execution of the above steps, the heating mode operates stably and it is necessary to enter the step of determining the risk of frost on the outdoor unit coil.

[0134] According to the defrost control method of the air conditioner provided by the embodiment of the present invention, please refer to Figure 4 ,include:

[0135] S400, obtaining the current time, the current outdoor ambient temperature, the coil temperature of the outdoor unit, the air outlet temperature of the outdoor unit, and the wind speed level of the outdoor unit.

[0136] S410, determining whether the current coil state is a frosted state according to the current time, ambient temperature, coil temperature, air outlet temperature, wind speed gear, and pre-acquired defrost determination conditions; wherein the current coil state includes a frosted state and a non-frosted state;

[0137] In step S410, when the current coil state is a frosted state, step S420 is executed; when the current coil state is a non-frosted state, step S430 is executed.

[0138] S420: Send a signal to operate the defrost mode.

[0139] S430: Send a signal to operate the heating mode.

[0140] In step S400 to step S430, when the air conditioner determines whether the outdoor unit enters a frosting state when in the heating mode, the influence of the outdoor ambient temperature and the coil temperature on the frosting of the outdoor unit coil is considered, and the outdoor ambient temperature and the coil temperature are used as one of the determination conditions. The frosting state is then verified by the ambient temperature and the air outlet temperature of the outdoor unit, and the influence of the ambient temperature, the air outlet temperature of the outdoor unit and the wind speed gear on the frosting is used as the second determination condition. The frosting state is determined more accurately, which can avoid misjudgment of entering the defrost mode, and can also eliminate the frost layer of the outdoor unit coil in time, thereby improving the user's comfort.

[0141] In some embodiments, the defrost determination condition is obtained by the following steps:

[0142] Get the preset ambient temperature, preset coil temperature determination relationship, preset duration, preset temperature and maximum wind speed level.

[0143] The first condition is determined according to a preset ambient temperature, and the second condition is determined according to the ambient temperature, a preset coil temperature determination relationship, and a preset time period.

[0144] The defrost judgment conditions are:

[0145] The ambient temperature satisfies the first condition, and the current moment and coil temperature satisfy the second condition, and the temperature difference between the outlet air temperature and the ambient temperature is less than or equal to the preset temperature, and the wind speed gear is the maximum wind speed gear.

[0146] According to the above steps, it can be seen that in the embodiment of the present invention, four conditions need to be met when determining frosting, namely, a first condition related to the ambient temperature, a second condition related to the coil temperature, a third condition related to the temperature difference between the outlet air temperature and the ambient temperature, and a fourth condition related to the wind speed gear.

[0147] When the above four conditions are met at the same time, not only the influence of ambient temperature and coil temperature on frost formation is considered, but also the influence of outlet air temperature and outlet air speed on frost formation. When one of them is not met, the defrost mode will not be entered, thus reducing false defrost judgments. The judgment condition for the maximum wind speed gear is increased in order to increase air circulation heat exchange as much as possible to defrost or delay defrost, extend the defrost cycle as much as possible, increase wind speed as a priority means of delaying defrost, avoid indoor temperature fluctuations when running defrost mode, and select defrost mode only after all available means have been exhausted.

[0148] In some embodiments, the defrost determination conditions include:

[0149] The ambient temperature is greater than a first preset ambient temperature, and the duration of the coil temperature being less than or equal to the first coil temperature determined by the judgment relationship between the ambient temperature and the preset coil temperature is greater than or equal to the first preset duration, and the temperature difference between the outlet air temperature and the ambient temperature is less than or equal to a third temperature, and the wind speed gear is the maximum wind speed gear.

[0150] Here are some examples:

[0151] Ta1<Ta, Te≤a1 and the duration is greater than or equal to 2min, and ΔT≤T3, and the wind speed gear is the maximum wind speed gear.

[0152] Among them, Ta1 is the first preset ambient temperature, Ta is the ambient temperature, Te is the coil temperature, a1 is the coefficient of the preset coil temperature determination relationship, which is a constant here and can be obtained according to experiments, ΔT is the temperature difference between the outlet air temperature and the ambient temperature, T3 is the third temperature, and the third temperature < first temperature < second temperature.

[0153] In some other embodiments, the defrost determination conditions include:

[0154] The ambient temperature is between a first preset ambient temperature and a second preset ambient temperature, and the duration of the coil temperature being less than or equal to the second coil temperature determined by the judgment relationship between the ambient temperature and the preset coil temperature is greater than or equal to the second preset duration, and the temperature difference between the outlet air temperature and the ambient temperature is less than or equal to the third temperature, and the wind speed gear is the maximum wind speed gear.

[0155] Here are some examples:

[0156] Ta2<Ta≤Ta1, Te≤a1*Ta-b1 and the duration is greater than or equal to t2min, and ΔT≤T3, and the wind speed gear is the maximum wind speed gear.

[0157] Alternatively, Ta2<Ta≤Ta1, Te≤a1*Ta-b2 and the duration is greater than or equal to t3min, and ΔT≤T3, and the wind speed level is the maximum wind speed level.

[0158] Among them, Ta1 is the first preset ambient temperature, Ta2 is the second preset ambient temperature, Ta is the ambient temperature, Te is the coil temperature, a1, b1, b2 are coefficients of the preset coil temperature determination relationship, which are constants here, t2 and t3 are setting parameters, ΔT is the temperature difference between the outlet air temperature and the ambient temperature, and T3 is the third temperature.

[0159] In some other embodiments, the defrost determination conditions include:

[0160] The ambient temperature is between the second preset ambient temperature and the third preset ambient temperature, and the duration of the coil temperature being less than or equal to the third coil temperature determined by the judgment relationship between the ambient temperature and the preset coil temperature is greater than or equal to the third preset duration, and the temperature difference between the outlet air temperature and the ambient temperature is less than or equal to the fifth temperature condition, and the wind speed gear is the maximum wind speed gear.

[0161] Here are some examples:

[0162] Ta3≤Ta≤Ta2, Te≤a2*Ta-b3 and the duration is greater than or equal to t4min, and ΔT≤T5, and the wind speed gear is the maximum wind speed gear.

[0163] Alternatively, Ta3≤Ta≤Ta2, Te≤a2*Ta-b4 and the duration is greater than or equal to t5min, and ΔT≤T5, and the wind speed level is the maximum wind speed level.

[0164] Among them, Ta2 is the second preset ambient temperature, Ta3 is the third preset ambient temperature, Ta is the ambient temperature, Te is the coil temperature, a2, b3, b4 are coefficients of the preset coil temperature determination relationship, which are constants here, t4 and t5 are setting parameters, ΔT is the temperature difference between the outlet air temperature and the ambient temperature, and T5 is the third temperature.

[0165] In some embodiments, the defrost determination conditions include:

[0166] The ambient temperature is between a third preset ambient temperature and a fourth preset ambient temperature, and the duration for which the coil temperature is less than or equal to a fourth coil temperature determined by the judgment relationship between the ambient temperature and the preset coil temperature is greater than or equal to a fourth preset duration, and the temperature difference between the outlet air temperature and the ambient temperature is less than or equal to a sixth temperature, and the wind speed gear is the maximum wind speed gear.

[0167] Here are some examples:

[0168] Ta4≤Ta≤Ta3, Te≤a3*Ta-b5 and the duration is greater than or equal to t6min, and ΔT≤T6, and the wind speed gear is the maximum wind speed gear.

[0169] Alternatively, Ta4≤Ta≤Ta3, Te≤a3*Ta-b6 and the duration is greater than or equal to t7min, and ΔT≤T6, and the wind speed level is the maximum wind speed level.

[0170] Among them, Ta3 is the third preset ambient temperature, Ta4 is the fourth preset ambient temperature, Ta is the ambient temperature, Te is the coil temperature, a3, b5, b6 are coefficients of the preset coil temperature determination relationship, which are constants here, t6 and t7 are setting parameters, ΔT is the temperature difference between the outlet air temperature and the ambient temperature, and T5 is the third temperature.

[0171] In the above frost determination conditions, the first preset ambient temperature, the second preset ambient temperature, the third preset ambient temperature, and the fourth preset ambient temperature decrease in sequence, and the third temperature, the fifth temperature, and the sixth temperature are set as needed.

[0172] In some embodiments, the defrost determination condition is obtained by the following steps:

[0173] Get the start time of the compressor and the start time of the heating mode.

[0174] The first operation time of the compressor is determined according to the start time of the compressor and the current time, and the second operation time is determined according to the start time of the heating mode and the current time.

[0175] The defrost judgment conditions are:

[0176] The first running time is longer than the seventh preset time, and the second running time is longer than the eighth preset time.

[0177] It can be understood that the above step determines whether the frosting state has been entered by the total first operating time of the compressor and the second operating time of the heating mode, which can serve as a supplement to determining the current coil state.

[0178] In some embodiments, the defrost determination condition can also be obtained by the following steps:

[0179] The start time of the heating mode is acquired, and the third operation time of the heating mode is determined according to the start time of the heating mode and the current time.

[0180] The defrost judgment conditions are:

[0181] The duration during which the ambient temperature is less than or equal to the fifth preset ambient temperature and the coil temperature is less than the seventh temperature is greater than or equal to a ninth preset duration, and the third operating duration of the heating mode is greater than or equal to a tenth preset duration.

[0182] Here are some examples:

[0183] The duration of Ta≤10°C (fifth preset ambient temperature) and Te<-3°C (seventh temperature) is greater than or equal to 100 min (ninth preset length), and the cumulative operating time of the heating mode is ≥tdft (default value).

[0184] The above are the frost determination conditions provided in the embodiments of the present invention. Different frost determination conditions can be programmed and stored in the memory. When the environmental factors meet any frost determination condition, the coil state can be determined to be a frost risk state, and the air conditioner can be controlled to enter the defrost mode.

[0185] According to the second aspect of the present invention, the defrost control device of the air conditioner is provided. Figure 5 ,include:

[0186] The acquisition module 501 is used to acquire the current time, the current outdoor ambient temperature, the coil temperature of the outdoor unit, the air outlet temperature of the outdoor unit, and the wind speed level of the outdoor unit, and determine the current coil state according to the current time, the ambient temperature, the coil temperature, the air outlet temperature, the wind speed level, and the pre-acquired defrosting judgment condition; wherein the current coil state includes a frosted state and a non-frosted state;

[0187] The signal sending module 502 is used to send a signal for running a defrosting mode when the current coil state is the frosting state; and send a signal for running a heating mode when the current coil state is the non-frosting state.

[0188] It should be noted that the above steps S400, S410, S420 and S430, as well as other steps, are only for the convenience of description and do not constitute a time sequence limitation for each step in the defrost control method for the air conditioner. In addition, some contents are described in detail in the defrost control method for the air conditioner provided in the first aspect embodiment, and the contents in all the defrost control methods for the air conditioner are also applicable to the defrost control device for the air conditioner provided in the second aspect embodiment, and in order to avoid repetition, the defrost control device for the air conditioner provided in the second aspect embodiment is not described in detail. Similarly, the contents in the above two aspects of the embodiments can be used to explain the contents of all the following aspects of the embodiments, so the repeated contents will not be repeated in the following embodiments. The defrost control device for the air conditioner provided according to the embodiment of the present invention has a technical effect corresponding to the technical effect of the above-mentioned defrost control method for the air conditioner, and will not be repeated here.

[0189] According to an embodiment of the third aspect of the present invention, an air conditioner is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps of the defrost control method for the air conditioner provided in the embodiment of the first aspect of the present invention are implemented.

[0190] When the air conditioner determines whether the outdoor unit enters a frosting state when in heating mode, the effect of the outdoor ambient temperature and the coil temperature on the frosting of the outdoor unit coil is taken into consideration, and the outdoor ambient temperature and the coil temperature are used as one of the determination conditions. The frosting state is then verified through the ambient temperature and the air outlet temperature of the outdoor unit, and the effect of the ambient temperature, the air outlet temperature of the outdoor unit and the wind speed gear on frosting is used as the second determination condition. The frosting state is determined more accurately, which can avoid misjudgment of entering the defrost mode, and can also eliminate the frost layer of the outdoor unit coil in time, thereby improving user comfort.

[0191] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A defrosting control method for an air conditioner, characterized in that: include: Obtaining the current time, the current outdoor ambient temperature, the coil temperature of the outdoor unit, the air outlet temperature of the outdoor unit, and the wind speed level of the outdoor unit, and determining the current coil state according to the current time, the ambient temperature, the coil temperature, the air outlet temperature, the wind speed level, and the pre-acquired defrosting judgment condition; wherein the current coil state includes a frosted state and a non-frosted state; When the current coil state is the frosting state, sending a signal for running a defrost mode; When the current coil state is the non-frosting state, a signal for operating a heating mode is sent.

2. The defrosting control method for an air conditioner according to claim 1, characterized in that: The defrost determination condition is obtained by the following steps: Obtain the preset ambient temperature, preset coil temperature determination relationship, preset duration, preset temperature and maximum wind speed level; Determining a first condition according to the preset ambient temperature, and determining a second condition according to the ambient temperature, the preset coil temperature determination relationship and the preset time length; The defrost determination condition is: The ambient temperature satisfies the first condition, and the current moment and the coil temperature satisfy the second condition, and the temperature difference between the outlet air temperature and the ambient temperature is less than or equal to the preset temperature, and the wind speed level is the maximum wind speed level.

3. The defrosting control method for an air conditioner according to claim 2, characterized in that: The defrost determination conditions include: The ambient temperature is greater than a first preset ambient temperature, and the duration of the coil temperature being less than or equal to a first coil temperature determined by a determination relationship between the ambient temperature and the preset coil temperature is greater than or equal to a first preset duration, and the temperature difference between the outlet air temperature and the ambient temperature is less than or equal to a third temperature, and the wind speed gear is the maximum wind speed gear; Or, the ambient temperature is between the first preset ambient temperature and the second preset ambient temperature, and the duration of the coil temperature being less than or equal to the second coil temperature determined by the determination relationship between the ambient temperature and the preset coil temperature is greater than or equal to the second preset duration, and the temperature difference between the outlet air temperature and the ambient temperature is less than or equal to a third temperature, and the wind speed gear is the maximum wind speed gear; Or, the ambient temperature is between the second preset ambient temperature and the third preset ambient temperature, and the duration of the coil temperature being less than or equal to the third coil temperature determined by the determination relationship between the ambient temperature and the preset coil temperature is greater than or equal to the third preset duration, and the temperature difference between the outlet air temperature and the ambient temperature is less than or equal to the fifth temperature, and the wind speed gear is the maximum wind speed gear; Or, the ambient temperature is between the third preset ambient temperature and the fourth preset ambient temperature, and the duration of the coil temperature being less than or equal to the fourth coil temperature determined by the determination relationship between the ambient temperature and the preset coil temperature is greater than or equal to the fourth preset duration, and the temperature difference between the outlet air temperature and the ambient temperature is less than or equal to the sixth temperature, and the wind speed gear is the maximum wind speed gear; Among them, the first preset ambient temperature, the second preset ambient temperature, the third preset ambient temperature, and the fourth preset ambient temperature decrease in sequence.

4. The defrosting control method for an air conditioner according to claim 2, characterized in that: The method further comprises: In response to a signal for operating a heating mode, obtaining an outdoor ambient temperature; The startup phase wind speed is determined according to the ambient temperature and the pre-acquired relationship between the wind speeds in the heating startup phase, and a signal is sent to control the outdoor unit to operate at the startup phase wind speed.

5. The defrosting control method for an air conditioner according to claim 4, characterized in that: The step of sending a signal to control the outdoor unit to run at the wind speed in the startup phase further includes: Obtaining the low-pressure saturation temperature, and determining the wind speed compensation value at intervals of a sixth preset time after the compressor has been running for a fifth preset time at the current moment according to the ambient temperature, the low-pressure saturation temperature, and a pre-acquired wind speed compensation correspondence relationship; The compensation wind speed is determined according to the wind speed compensation value and the wind speed in the startup phase, and a signal is sent to control the outdoor unit to operate at the compensation wind speed.

6. The defrosting control method for an air conditioner according to claim 5, characterized in that: The step of determining the wind speed compensation value according to the ambient temperature, the low pressure saturation temperature and the pre-acquired wind speed compensation correspondence relationship specifically includes: When the difference between the ambient temperature and the low-pressure saturation temperature is greater than a fourth temperature condition, the wind speed compensation value is increased by a first preset gear; When the difference between the ambient temperature and the low pressure saturation temperature is between the fourth temperature condition and the fifth temperature condition, the wind speed compensation value is zero; When the difference between the ambient temperature and the low-pressure saturation temperature is less than the fifth temperature condition, the wind speed compensation value is reduced by a second preset gear.

7. The defrosting control method for an air conditioner according to claim 6, characterized in that: The method further comprises: The range of the wind speed level of the outdoor unit is determined according to the ambient temperature.

8. The defrosting control method for an air conditioner according to claim 1, characterized in that: The defrost determination condition is obtained by the following steps: Get the start time of the compressor and the start time of the heating mode; Determining a first operation duration according to the start time of the compressor and the current time, and determining a second operation duration according to the start time of the heating mode and the current time; The defrost determination conditions include: The first running time is longer than a seventh preset time, and the second running time is longer than an eighth preset time.

9. The defrosting control method for an air conditioner according to claim 1, characterized in that: The defrost determination condition is obtained by the following steps: Acquire a start time of the heating mode, and determine a third operation time of the heating mode according to the start time of the heating mode and the current time; The defrost determination condition is: The duration for which the ambient temperature is less than or equal to the fifth preset ambient temperature and the coil temperature is less than the seventh temperature is greater than or equal to a ninth preset duration, and the third operating duration of the heating mode is greater than or equal to a tenth preset duration.

10. A defrost control device for an air conditioner, characterized in that: include: An acquisition module, used to acquire the current time, the current outdoor ambient temperature, the coil temperature of the outdoor unit, the air outlet temperature of the outdoor unit, and the wind speed level of the outdoor unit, and determine the current coil state according to the current time, the ambient temperature, the coil temperature, the air outlet temperature, the wind speed level, and the pre-acquired defrosting judgment condition; wherein the current coil state includes a frosted state and a non-frosted state; The signal sending module is used to send a signal for running a defrosting mode when the current coil state is the frosting state; and send a signal for running a heating mode when the current coil state is the non-frosting state.

11. An air conditioner, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the steps of the defrost control method for the air conditioner according to any one of claims 1 to 9 are implemented.

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