Air conditioner and multi-split air conditioner

Abstract

The air conditioner comprises an outdoor shell, an outdoor heat exchanger arranged in the outdoor shell, an environment temperature detection device and a controller, the environment temperature detection device is arranged on one side of the outdoor heat exchanger and used for detecting the outdoor environment temperature, and the controller is electrically connected with the environment temperature detection device. The controller is configured to obtain a temperature change value according to the difference value of the detection values of the environment temperature detection device before the air conditioner is started and after the air conditioner runs for the preset time, when the temperature change value is larger than a preset threshold value, a defrosting program is triggered, and whether frosting exists or not is directly judged through the change difference value of the environment temperature detection values. The situation that defrosting lags due to inaccurate detection values caused by frosting of the environment temperature detection device is eliminated, interference of natural cooling of the environment is eliminated on the basis of comparison of the detection values before starting up and the detection values after operation, the frosting risk is accurately recognized through the temperature difference threshold value, defrosting is prevented from being triggered by mistake or missed triggering, and the defrosting efficiency is improved. And the defrosting timeliness and accuracy are improved.

Description

Technical Field

[0001] This invention belongs to the field of air conditioner technology, and particularly relates to an air conditioner and a multi-split air conditioner. Background Technology

[0002] Air conditioners include an outdoor ambient temperature detection device. In related technologies, the defrosting control logic of air conditioners mainly relies on the detection value of the outdoor ambient temperature detection device. When the detection value meets the set conditions, defrosting control is triggered.

[0003] However, in low temperature and high humidity or rainy environments, the outdoor ambient temperature detection device may freeze, resulting in abnormally low detection values. In related technologies, the difference between the outdoor heat exchanger temperature and the outdoor ambient temperature in the defrosting logic cannot reach the threshold, thus failing to trigger defrosting in time and causing defrosting lag.

[0004] In view of the above, this application is hereby submitted. Summary of the Invention

[0005] To address the aforementioned technical issues, this application proposes an air conditioner and a multi-split air conditioner that, by detecting changes in the ambient temperature detection device's readings, alters the reliance on the device's readings at a given moment, thereby enabling the identification of abnormal frost risk and timely defrosting control.

[0006] This application provides an air conditioner, including an outdoor casing, an outdoor heat exchanger disposed inside the outdoor casing, an ambient temperature detection device, and a controller. The ambient temperature detection device is disposed on one side of the outdoor heat exchanger and is used to detect the outdoor ambient temperature. The controller is electrically connected to the ambient temperature detection device.

[0007] The controller is configured to acquire the ambient temperature detection values ​​before the air conditioner is turned on and after a preset running time, and obtain the temperature change value based on the difference between the two detection values. When the temperature change value is greater than a preset threshold, the defrosting program is triggered.

[0008] The above method directly determines whether frost has formed by the difference in the ambient temperature detection value, eliminating the possibility of inaccurate detection values ​​caused by frost formation on the ambient temperature detection device itself, which could lead to delayed defrosting.

[0009] By comparing the detection values ​​before startup and after operation, the interference of natural cooling is eliminated, and the risk of frost is accurately identified through temperature difference thresholds, avoiding false or missed defrosting and improving the timeliness and accuracy of defrosting.

[0010] The automated defrosting process reduces manual intervention, ensures stable operation of the air conditioner in low-temperature environments, and extends the service life of the heat exchanger.

[0011] In some embodiments, the controller is configured to define the detection value of the ambient temperature detection device before power-on as a first ambient temperature, and when the first ambient temperature is within a first temperature range, determine that the ambient temperature detection device is at risk of frosting.

[0012] After the first preset time after power-on, the second ambient temperature detected by the ambient temperature detection device is obtained; after the second preset time of operation, the third ambient temperature detected by the ambient temperature detection device is obtained.

[0013] When the difference between the third ambient temperature and the second ambient temperature exceeds the first preset threshold, it is determined that the surface of the ambient temperature detection device is frosted, and the defrosting procedure is triggered.

[0014] The above embodiments first identify high-frosting scenario risks by using a first temperature range, and then specifically enable multi-time-point temperature detection to improve the judgment accuracy in high-risk scenarios. Continuous detection at first and second preset times captures temperature change trends, avoiding random errors from single detections and further reducing the false judgment rate.

[0015] Determine whether there is frost on the surface of the ambient temperature detection device, and ensure the accuracy of the ambient temperature detection device while defrosting, thus forming a closed-loop control.

[0016] In some embodiments, the controller is configured to adjust the time of the next defrost cycle based on whether the defrost time in the defrost procedure has reached the set defrost time.

[0017] If the actual defrosting time reaches the set defrosting time, it indicates that the amount of frost is large. Shortening the next defrosting cycle can prevent excessive frost from affecting heat exchange efficiency. If the set defrosting time is not reached, it indicates that the amount of frost is small. Extending the cycle can reduce defrosting energy consumption and achieve on-demand adjustment based on actual defrosting needs.

[0018] In some embodiments, the controller is configured to define the detection value of the ambient temperature detection device before power-on as a first ambient temperature, and when the first ambient temperature is within a second temperature range, determine that the risk of frosting is smaller than when the first ambient temperature is within the first temperature range, wherein the upper limit of the second temperature range is not greater than the lower limit of the first temperature range.

[0019] Obtain the air conditioner's off time, and turn it on when the off time is less than the preset off time;

[0020] After running for the third preset time, the fourth ambient temperature detected by the ambient temperature detection device is obtained;

[0021] After running for the fourth preset time, the fifth ambient temperature detected by the ambient temperature detection device is obtained;

[0022] When the difference between the fifth ambient temperature and the fourth ambient temperature exceeds the second preset threshold, it is determined that the surface of the ambient temperature detection device is frosted, and the defrosting procedure is triggered.

[0023] The above embodiments introduce downtime as an auxiliary judgment condition for low-frosting risk scenarios, thereby reducing excessive detection and energy consumption in low-risk scenarios.

[0024] The system uses the difference between the temperature detected before power-on and the temperature detected after the third preset temperature to determine the accuracy. This is suitable for low-risk scenarios that prefer slow frosting speed and small temperature difference changes, thus balancing detection accuracy and efficiency.

[0025] By classifying high and low frost risk levels, a layered defrosting trigger logic is implemented, making the control logic more aligned with actual working conditions and improving adaptability to different environments.

[0026] In some embodiments, the controller is configured to trigger a defrosting procedure when the downtime is not less than a preset downtime.

[0027] If the downtime exceeds the preset downtime, it is determined that the air conditioner has been shut down for an extended period of time. Due to the accumulation of ambient humidity, frost may form on the surface of the outdoor heat exchanger. Directly triggering defrosting can prevent the frost from affecting heat exchange after the unit is turned on, thus ensuring startup efficiency.

[0028] The above control logic does not require complex temperature difference calculations, which simplifies the defrosting control logic after long-term shutdown, reduces the controller's computational load, and ensures that potential frost layers are removed in a timely manner.

[0029] In some embodiments, the controller is configured to adjust the time of the next defrost cycle based on whether the defrost time in the defrost procedure has reached the set defrost time.

[0030] Defrosting cycles are dynamically optimized for low-risk scenarios, shortening the cycle when frost accumulation is high and extending it when frost accumulation is low, thus avoiding energy waste in low-risk situations. This cycle adjustment further refines the control strategy and improves overall operational efficiency.

[0031] In some embodiments, when the defrosting procedure is triggered multiple times consecutively by the difference, it is determined that the ambient temperature detection device is malfunctioning.

[0032] Under normal circumstances, the frost problem should be temporarily resolved after defrosting. Repeated triggering indicates that the detection device may be malfunctioning (such as sensor drift or surface contamination) and causing misjudgment. Timely identification of abnormal ambient temperature detection device can avoid frequent ineffective defrosting caused by detection device failure, while also prompting maintenance and improving the reliability of the air conditioner.

[0033] In some embodiments, the controller is configured to define the detection value of the ambient temperature detection device before power-on as a first ambient temperature, and to trigger a defrosting procedure based on the difference between the detection value of the ambient temperature detection device and the heat exchanger when the first ambient temperature exceeds the upper limit of a first temperature range.

[0034] Although the risk of frost formation is low in environments above zero degrees Celsius, heat exchangers may experience condensation freezing due to high local humidity (such as during the rainy season). Such special scenarios can be accurately captured by measuring the temperature difference between the ambient temperature and the heat exchanger.

[0035] The defrosting judgment logic for scenarios above zero degrees Celsius is supplemented to avoid the limitations of traditional temperature range judgment, achieve frost protection across the entire temperature range, and improve the applicability of the air conditioner.

[0036] This application also proposes another multi-split air conditioner, which includes:

[0037] An outdoor unit includes at least two outdoor units, which are defined as the first outdoor unit and the second outdoor unit.

[0038] Ambient temperature detection devices are installed in the corresponding outdoor units, with the number of such devices matching the number of outdoor units.

[0039] The controller is electrically connected to the ambient temperature detection device;

[0040] The controller is configured to acquire the detection values ​​of each ambient temperature detection device, and trigger the defrosting program when the maximum difference between the detection values ​​is greater than a third preset threshold.

[0041] When multiple outdoor units of a multi-split air conditioner are in the same environment, the readings from multiple ambient temperature sensors should be close. If the difference is too large, it indicates that some outdoor units may be frosting, and the corresponding ambient temperature sensor readings are abnormal.

[0042] By comparing detection values ​​across multiple outdoor units, without relying on historical data from a single detection device, it can quickly identify outdoor units with abnormal frost buildup, enabling targeted defrosting and improving the overall operating efficiency of multi-split air conditioning systems.

[0043] In some embodiments, the controller is configured to acquire the detection values ​​of each ambient temperature detection device after running for a fifth preset time, and to acquire the detection values ​​of each ambient temperature detection device after running for a sixth preset time.

[0044] If the difference between the values ​​detected by any ambient temperature detection device at the two times mentioned above reaches the fourth preset threshold, the defrosting procedure is triggered.

[0045] The above embodiments are based on the difference between the detection value of a single outdoor unit before it is turned on and the detection value after it has been running for a period of time. The frosting situation of a single outdoor unit in a multi-split air conditioner is judged independently to avoid the overall operation being affected by the frosting of a certain unit.

[0046] In the air conditioner and multi-split air conditioner proposed in the above embodiments, the air conditioner obtains a temperature change value based on the difference between the detected values ​​of the ambient temperature detection device before startup and after a preset running time. When the temperature change value exceeds a preset threshold, a defrosting program is triggered. Based on the comparison between the detected values ​​before startup and after operation, interference from natural ambient cooling is eliminated. The risk of frost formation is accurately identified through the temperature difference threshold, avoiding false or missed defrosting triggers and improving the timeliness and accuracy of defrosting. Attached Figure Description

[0047] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0048] Figure 1 This is a system block diagram of an air conditioning system according to one embodiment of the present invention;

[0049] Figure 2 This is a flowchart of the defrosting judgment logic of an air conditioner in one embodiment of the present invention;

[0050] Figure 3 This is the defrosting judgment logic of the air conditioner when the ambient temperature is at a first ambient temperature in one embodiment of the present invention.

[0051] Figure 4 This is the defrosting control logic of the air conditioner when the ambient temperature is at a first ambient temperature in one embodiment of the present invention;

[0052] Figure 5 This is the defrosting judgment logic when the ambient temperature of the air conditioner is at a second ambient temperature in one embodiment of the present invention;

[0053] Figure 6 This is the defrosting control logic in one embodiment of the present invention when the ambient temperature of the air conditioner is at a second ambient temperature;

[0054] Figure 7 This is a hardware block diagram of a multi-split air conditioner in one embodiment of the present invention;

[0055] Figure 8 This is the defrosting judgment logic for a multi-split air conditioner in one embodiment of the present invention when the ambient temperature is within a first temperature range;

[0056] Figure 9 This is the defrosting control logic of a multi-split air conditioner in one embodiment of the present invention when the ambient temperature is within a first temperature range;

[0057] Figure 10 This is the defrosting judgment logic for a multi-split air conditioner in one embodiment of the present invention when the ambient temperature is in the second temperature range.

[0058] Explanation of reference numerals in the attached figures:

[0059] 100 - Multi-split air conditioner; 10 - Indoor unit; 20 - Outdoor unit; 2 - Outdoor unit;

[0060] 22-Expansion valve; 23-Condenser; 24-Evaporator; 21-Compressor. Detailed Implementation

[0061] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0062] In the description of this invention, it should be understood that the terms "center", "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0063] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0064] This application discloses an air conditioner, which includes an outdoor unit. The outdoor unit is installed outdoors.

[0065] The outdoor unit includes an outdoor casing, which forms the external outline of the outdoor unit and houses its internal components.

[0066] The indoor unit includes an outdoor heat exchanger, which is installed inside the outdoor casing. The outdoor heat exchanger exchanges heat with the outdoor air entering the outdoor casing.

[0067] An air conditioner also includes an indoor unit, which is connected to the outdoor unit by pipes for refrigerant circulation.

[0068] The indoor unit includes an indoor casing, which forms the outer contour of the indoor unit and houses its internal components.

[0069] The indoor unit includes an indoor heat exchanger. The indoor heat exchanger is installed inside the indoor casing. The indoor heat exchanger is used to exchange heat with the indoor air entering the indoor casing.

[0070] The air conditioners in this application include, but are not limited to, wall-mounted air conditioners, cabinet air conditioners, and ducted air conditioners.

[0071] In this embodiment, refer to Figure 1 As shown, the air conditioner includes an air conditioning system.

[0072] The air conditioning system includes a compressor 21. The compressor 21 can compress refrigerant gas under high temperature and high pressure and discharge the compressed refrigerant gas.

[0073] The compressor 21 includes an intake port and an exhaust port. Refrigerant flows back to the compressor through the intake port and exits the compressor through the exhaust port.

[0074] The air conditioning system includes a condenser 23. The condenser 23 can achieve a cooling effect by using the latent heat of refrigerant condensation to exchange heat with the material to be cooled.

[0075] The air conditioning system includes an expansion valve 22. During cooling operation, the expansion valve 22 controls the flow of refrigerant from the outdoor heat exchanger to the indoor heat exchanger by adjusting its own opening.

[0076] The air conditioning system includes an evaporator 24. The evaporator 24 can achieve a cooling effect by exchanging heat with the material to be cooled using the latent heat of refrigerant evaporation.

[0077] The refrigerant gas discharged from the exhaust port of compressor 21 flows into condenser 23, where the condenser 23 condenses the compressed refrigerant into a liquid phase and releases heat to the surrounding environment through the condensation process.

[0078] Expansion valve 22 expands the high-temperature, high-pressure liquid refrigerant condensed in condenser 23 into a low-pressure liquid refrigerant. Evaporator 24 evaporates the refrigerant that has expanded in expansion valve 22 and returns the low-temperature, low-pressure refrigerant gas to the suction port of compressor 21.

[0079] The indoor and outdoor heat exchangers serve as either condensers 23 or evaporators 24. When the indoor heat exchanger is used as condenser 23, the air conditioner functions as a heater in heating mode. When the indoor heat exchanger is used as evaporator 24, the air conditioner functions as a cooler in cooling mode.

[0080] The following explains the cooling and heating modes of the air conditioner.

[0081] When the air conditioner is in cooling mode, the refrigerant compressed by the compressor 21 flows through the outdoor heat exchanger and condenses. The condensed refrigerant then expands by flowing through the expansion valve 22. The expanded refrigerant evaporates through the indoor heat exchanger. Finally, the evaporated refrigerant circulates back to the compressor 21.

[0082] When the air conditioner is in heating mode, the refrigerant compressed by the compressor 21 flows through the indoor heat exchanger and condenses. The condensed refrigerant then expands by flowing through the expansion valve 22. The refrigerant after the expansion valve 22 evaporates through the outdoor heat exchanger. Then, the evaporated refrigerant circulates back to the compressor 21.

[0083] In cold regions, air conditioners operate continuously at low temperatures to meet indoor heating needs. However, when low temperatures are combined with rainy or high-humidity conditions (for example, a mixture of rain and snow around -10°C to 0°C), the outdoor heat exchanger, acting as the evaporator 24, absorbs heat through evaporation in heating mode. It not only frosts due to the temperature being below the ambient dew point, but also rapidly frosts due to rainwater directly contacting the low-temperature heat exchanger surface. If defrosting is not performed promptly, the evaporation pressure will drop sharply, the compressor's suction superheat will be rapidly lost, and the risk of liquid return will significantly increase.

[0084] If liquid backflow occurs, it will not only dilute the compressor lubricating oil, but may also cause liquid slugging, resulting in irreversible damage such as valve plate breakage and bearing wear, which will seriously shorten the equipment life.

[0085] The air conditioner includes an ambient temperature detection device, which is located on one side of the outdoor heat exchanger and is used to detect the outdoor ambient temperature. The ambient temperature detection device can be configured as a temperature sensor to detect the outdoor ambient temperature.

[0086] The air conditioner includes a controller, which is electrically connected to an ambient temperature detection device.

[0087] The controller coordinates the operation of the entire air conditioner. This includes receiving user commands, controlling the operation of cooling, heating, defrosting, and fan modes, and uploading the air conditioner's operating status to the cloud.

[0088] In related technologies, the defrosting program of an air conditioner mainly relies on the detection value of an ambient temperature detection device. Generally, the control logic includes the range of the detection value, the ambient temperature detection value, the temperature difference of the outdoor heat exchanger, and the running time of the heating mode. The above control logic depends on whether the detection value of the ambient temperature detection device is an accurate outdoor ambient temperature.

[0089] However, in low temperature and high humidity or rainy environments, the ambient temperature detection device may freeze, resulting in abnormally low detection values. The difference between the outdoor heat exchanger temperature and the ambient temperature detection device's detection value may not reach the threshold, thus failing to trigger the defrosting procedure in time, leading to excessive accumulation of ice and frost mixture.

[0090] The air conditioner in this embodiment of the application introduces multi-dimensional parameters for collaborative judgment, breaking through the dependence on a single detection value, and realizing accurate identification of abnormal frost risk and timely defrosting control, thereby improving system reliability and avoiding increased hardware costs.

[0091] In some implementations of this embodiment, reference is made to Figure 2 As shown, the controller is configured to acquire the ambient temperature detection value before the air conditioner is turned on and the ambient temperature detection value after a preset running time (S201).

[0092] In some embodiments of this example, the temperature change value is obtained based on the difference between the detection values ​​before the air conditioner is turned on and after a preset running time (S202).

[0093] In some embodiments of this example, when the temperature change value is greater than a preset threshold, a defrosting procedure is triggered (S203).

[0094] The above method directly determines whether frost has formed by the difference in the ambient temperature detection value, eliminating the possibility of inaccurate detection values ​​caused by frost formation on the ambient temperature detection device itself, which could lead to delayed defrosting.

[0095] In this embodiment, some operations of the above logic may be optionally combined, and / or the order of some operations may be optionally changed.

[0096] By comparing the detection values ​​before startup and after operation, the interference of natural cooling is eliminated, and the risk of frost is accurately identified through temperature difference thresholds, avoiding false or missed defrosting and improving the timeliness and accuracy of defrosting.

[0097] The automated defrosting process reduces manual intervention, ensures stable operation of the air conditioner in low-temperature environments, and extends the service life of the heat exchanger.

[0098] Because low-temperature frost or frost phenomena mainly occur between freezing point and street level (-10℃-0℃), raindrops in the air are not completely frozen. If the temperature is below -10℃, raindrops usually condense into snowflakes or ice particles during their fall and will not come into contact with the detection device in the form of liquid rainwater. At this time, the raindrops exist in the form of supercooled water droplets. Once they come into contact with the surface of an object below 0℃, for example, the outer shell of the ambient temperature detection device will instantly release latent heat and freeze into ice.

[0099] Therefore, this application sets different control logic according to different temperature ranges of the ambient temperature. Here, it refers to the detection value of the ambient temperature detection device, which is the detection value of the ambient temperature detection device obtained after the air conditioner is powered on and before the compressor starts.

[0100] The determination of the range of the detected values ​​must also be completed before the compressor is started.

[0101] In some embodiments, refer to Figure 3 The diagram illustrates the defrosting logic when the ambient temperature of the air conditioner is within the first temperature range.

[0102] The controller is configured to define the detection value of the ambient temperature detection device before power-on as the first ambient temperature, and when the first ambient temperature is within the first temperature range, it is determined that there is a risk of frosting (S301).

[0103] It should be noted that the above "before starting up" refers to before the compressor starts.

[0104] When the ambient temperature detected before powering on is within the first temperature range, the outdoor ambient temperature can be in the following situations.

[0105] First, in the absence of high humidity or rainfall, the ambient temperature readings are accurate. Second, in hot and rainy weather, the ambient temperature detection device and the outdoor heat exchanger may be partially frozen, but they are not in contact through the ice layer. In this case, the reading from the ambient temperature detection device is approximately equal to the actual temperature, and the reading may be slightly higher due to the ice layer preventing heat exchange with the air. Third, in high humidity and rainy weather, the ambient temperature detection device and the outdoor heat exchanger may be largely frozen during air conditioner operation, and they may be in contact through the ice layer. As the air conditioner operates, the low temperature of the outdoor heat exchanger gradually radiates to the ambient temperature detection device, causing the reading to decrease. This application's embodiments primarily address the defrosting lag problem caused by the third scenario.

[0106] In some embodiments of this example, after a first preset time t1 after power-on, the second ambient temperature detected by the ambient temperature detection device is obtained (S302).

[0107] It should be noted that the first preset time t1 can be set to any value between 5 and 10 minutes, representing the relatively accurate ambient temperature value detected when the unit is not frosted or has only a small amount of frost.

[0108] If t1 is less than 5 minutes, the air conditioner will operate unstablely, and other parameter values ​​will be inaccurate. If t1 is greater than 10 minutes, the air conditioner may have already started to frost over, leading to inaccurate temperature readings.

[0109] After running for a second preset time t2, the third ambient temperature detected by the ambient temperature detection device is obtained (S303). It should be noted that in order to protect the heating effect, t2 needs to be at least greater than 30 minutes. In some embodiments of this example, when the difference between the third ambient temperature and the second ambient temperature exceeds a first preset threshold, it is determined that the ambient temperature detection device has experienced a significant drop in temperature in a short period of time, and frost forms on the surface of the ambient temperature detection device. At this time, the defrosting procedure is immediately triggered (S304).

[0110] The above embodiments first identify high-frosting scenario risks by using a first temperature range, and then specifically enable multi-time-point temperature detection to improve the judgment accuracy in high-risk scenarios. Continuous detection at first and second preset times captures temperature change trends, avoiding random errors from single detections and further reducing the false judgment rate.

[0111] Determine whether there is frost on the surface of the ambient temperature detection device, and ensure the accuracy of the ambient temperature detection device while defrosting, thus forming a closed-loop control.

[0112] In some embodiments of this example, when the difference between the third ambient temperature and the second ambient temperature does not exceed the first preset threshold, it is determined that no abnormal large-area frost has occurred, and the controller makes a judgment according to the traditional defrosting judgment logic.

[0113] The traditional defrosting logic here includes the defrosting logic in the aforementioned related technologies, and may also include other existing defrosting logic.

[0114] If the traditional defrosting judgment logic is not satisfied after executing the traditional defrosting judgment logic, the difference in detection values ​​of the ambient temperature detection device in this application embodiment can be used to continue to make defrosting judgment.

[0115] In some embodiments, the controller is configured to calculate the defrosting time after the defrosting procedure is completed. Based on whether the defrosting time in the defrosting procedure has reached the set defrosting time, the time of the next defrosting cycle is adjusted.

[0116] If the actual defrosting time reaches the set defrosting time, it indicates that the amount of frost is large. Shortening the next defrosting cycle can prevent excessive frost from affecting heat exchange efficiency. If the set defrosting time is not reached, it indicates that the amount of frost is small. Extending the cycle can reduce defrosting energy consumption and achieve on-demand adjustment based on actual defrosting needs.

[0117] The defrosting logic in this application includes multiple defrosting cycles, including at least a set defrosting cycle (which is also the maximum defrosting cycle) and an adjustment cycle, wherein the time of the adjustment cycle is shorter than the time of the set defrosting cycle.

[0118] Those skilled in the art can set the defrost cycle according to the actual defrost logic.

[0119] In this embodiment, if the defrosting time in the defrosting program reaches the set defrosting time, the air conditioner will take the ambient temperature value detected after the defrosting program is restarted and the set time is started again as the new second ambient temperature, and the difference between the new second ambient temperature and the third ambient temperature will be used to determine defrosting.

[0120] Reference Figure 4 As shown, in Figure 3Based on this, after the defrosting procedure is completed, the time taken for defrosting is calculated (S401).

[0121] Determine whether the defrosting time has reached the set defrosting time (S402).

[0122] In step S402, if the defrosting time reaches the set defrosting time, then step S403 is executed to shorten the next defrosting cycle.

[0123] In step S402, if the defrosting time has not reached the set defrosting time, step 404 is executed to obtain the ambient temperature after the current defrosting is completed, and to execute the corresponding defrosting judgment logic according to the temperature range of the ambient temperature.

[0124] In step S404 above, after the defrosting is completed, the ambient temperature detected by the ambient temperature detection device is obtained, and the corresponding defrosting judgment logic is executed according to whether the ambient temperature belongs to the first temperature range or the second temperature range.

[0125] By dynamically adjusting the defrost cycle and combining it with operating conditions and environmental conditions, the defrost control can be adaptively optimized, reducing ineffective defrosting while ensuring heating performance, improving energy efficiency, and balancing system reliability and energy efficiency.

[0126] In some embodiments, the controller is configured to define the detection value of the ambient temperature detection device before power-on as a first ambient temperature. When the first ambient temperature is within a second temperature range, it is determined that the risk of frost formation is lower than when the first ambient temperature is within the first temperature range, and the ambient temperature detection device is relatively accurate at this time.

[0127] It should be noted that the upper limit of the second temperature range is less than or equal to the lower limit of the first temperature range. For example, the first temperature range is -10℃ to 0℃ (inclusive of -10℃), and the second temperature range is below -10℃ (exclusive of -10℃).

[0128] Of course, those skilled in the art can adjust the definition of temperature range according to actual circumstances; the above is merely an example.

[0129] In some embodiments of this example, the downtime of the air conditioner is obtained. It should be noted that the downtime is calculated from the moment the compressor 21 is turned off.

[0130] By introducing a reference value for downtime, the possibility of ice buildup during the natural temperature drop of an air conditioner after a long period of inactivity is considered. This effectively addresses defrosting scenarios.

[0131] When the downtime is less than the preset downtime, the machine is turned on. After running for the third preset time, the fourth ambient temperature detected by the ambient temperature detection device is obtained.

[0132] It should be noted that the preset downtime can be set according to actual operating conditions. For example, the preset downtime in areas with low temperatures should be shorter than that in areas with relatively high temperatures.

[0133] After running for the fourth preset time, the fifth ambient temperature is obtained from the ambient temperature detection device.

[0134] When the difference between the fifth ambient temperature and the fourth ambient temperature exceeds the second preset threshold, it is determined that the surface of the ambient temperature detection device is frosted, and the defrosting procedure is triggered.

[0135] The above embodiments introduce downtime as an auxiliary judgment condition for low-frosting risk scenarios, thereby reducing excessive detection and energy consumption in low-risk scenarios.

[0136] The difference between the detected temperatures at the third and fourth preset running times is used to determine the frost formation, and the dynamic difference is used instead of the static temperature to improve the accuracy of frost formation detection.

[0137] By classifying high and low frost risk levels, a layered defrosting trigger logic is implemented, making the control logic more aligned with actual working conditions and improving adaptability to different environments.

[0138] Based on a multi-parameter collaborative judgment mechanism, by detecting changes in ambient temperature, compressor downtime and continuous operation time or downtime, and other multi-dimensional parameters, it breaks through the reliance on the detection value of a single detection device, and achieves accurate identification of abnormal frost and timely defrosting control.

[0139] In this embodiment, when the difference between the first ambient temperature and the fourth ambient temperature does not exceed the second preset threshold, the controller makes a judgment according to the defrosting procedure in the related technology.

[0140] The defrosting procedure in the related technologies described herein includes the defrosting logic described above, and may also include other existing defrosting logic. In some embodiments, the controller is configured to trigger the defrosting procedure when the downtime is not less than a preset downtime.

[0141] When the downtime exceeds the preset downtime, it is determined that the air conditioner has been shut down for an extended period of time, which may result in ice buildup during the shutdown process. In this case, the first defrost time is shortened to a short cycle to prevent the air conditioner from running in a frosty state for an extended period upon initial startup.

[0142] If the downtime exceeds the first preset time, it is determined that the air conditioner has been shut down for an extended period of time. Due to the accumulation of ambient humidity, frost may form on the surface of the outdoor heat exchanger. Directly triggering defrosting can prevent the frost from affecting heat exchange after the unit is turned on, thus ensuring startup efficiency.

[0143] The above control logic does not require complex temperature difference calculations, which simplifies the defrosting control logic after long-term shutdown, reduces the controller's computational load, and ensures that potential frost layers are removed in a timely manner.

[0144] Reference Figure 5 The diagram illustrates the defrosting logic when the ambient temperature of the air conditioner is within the second temperature range.

[0145] The ambient temperature detection value of the device before power-on is defined as the first ambient temperature (S201). The first ambient temperature is within the second temperature range (S509).

[0146] Obtain the air conditioner's shutdown time (S502), and determine whether the shutdown time is less than the preset shutdown time (S503).

[0147] In step S503, if the downtime is less than the preset downtime, then step S504 is executed, and after running for a third preset time, the fourth ambient temperature detected by the ambient temperature detection device is obtained. Then step S510 is executed, and after running for a fourth preset time, the fifth ambient temperature detected by the ambient temperature detection device is obtained.

[0148] Determine whether the difference between the fifth ambient temperature and the fourth ambient temperature exceeds the second preset threshold (S505).

[0149] In step S505, if the difference exceeds the second preset threshold, then step S507 is executed.

[0150] In step S505, if the difference does not exceed the second preset threshold, then step S506 is executed to determine whether the traditional defrosting judgment logic is met.

[0151] If the condition is not met in step S506, then step S508 is executed, and the system operates normally.

[0152] If the condition is met in step S506, then step S507 is executed. If the downtime is not less than the preset downtime in step S503, then step S507 is executed, triggering the defrosting logic.

[0153] In some embodiments, the controller is configured to obtain the defrosting time after the defrosting procedure ends, and adjust the time of the next defrosting cycle based on whether the defrosting time in the defrosting procedure has reached the set defrosting time.

[0154] Defrosting cycles are dynamically optimized for low-risk scenarios, shortening the cycle when frost accumulation is high and extending it when frost accumulation is low, thus avoiding energy waste in low-risk situations. This cycle adjustment further refines the control strategy and improves overall operational efficiency.

[0155] In this embodiment, when the current defrosting time reaches the set defrosting time, the time for the next cycle is shortened.

[0156] If the defrosting time has not been reached, the ambient temperature will be re-acquired for further assessment.

[0157] Reference Figure 6 As shown, in Figure 5 Based on this, after the defrosting procedure is completed, the time taken for defrosting is calculated (S601).

[0158] Determine whether the defrosting time has reached the set defrosting time (S602).

[0159] In step S602, if the defrosting time reaches the set defrosting time, then step S603 is executed to shorten the next defrosting cycle.

[0160] In step S602, if the defrosting time has not reached the set defrosting time, then step S604 is executed to obtain the ambient temperature after the current defrosting is completed, and to execute the corresponding defrosting judgment logic according to the temperature range of the ambient temperature at this time.

[0161] In step S604 above, after the defrosting is completed, the ambient temperature detected by the ambient temperature detection device is obtained, and the corresponding defrosting judgment logic is executed according to whether the ambient temperature belongs to the first temperature range or the second temperature range.

[0162] In some embodiments, when the defrosting procedure is triggered multiple times consecutively by the difference, it is determined that the ambient temperature detection device is malfunctioning.

[0163] Under normal circumstances, the frost problem should be temporarily resolved after defrosting. Repeated triggering indicates that the detection device may be malfunctioning (e.g., sensor drift, surface contamination) and causing misjudgment. Timely identification of ambient temperature detection device abnormalities can avoid frequent ineffective defrosting due to device failure, while also prompting maintenance and improving the reliability of the air conditioner. In some embodiments, the controller is configured to define the detection value of the ambient temperature detection device before startup as a first ambient temperature. When the first ambient temperature exceeds the upper limit of a first temperature range, the defrosting procedure is triggered based on the difference between the detection value of the ambient temperature detection device and the temperature of the outdoor heat exchanger.

[0164] When the first ambient temperature exceeds the upper limit of the first temperature range, the defrosting judgment logic in the relevant technology is used for judgment. The above-mentioned use of the difference between the detection value of the ambient temperature detection device and the temperature of the outdoor heat exchanger to trigger the defrosting program is only one of the defrosting judgment logics.

[0165] Although the risk of frost is low at temperatures above zero degrees Celsius, condensation may freeze in the heat exchanger due to high local humidity (such as during the rainy season). Such special scenarios can be accurately captured by measuring the temperature difference between the ambient temperature and the heat exchanger.

[0166] The defrosting judgment logic for scenarios above zero degrees Celsius is supplemented to avoid the limitations of traditional temperature range judgment, achieve frost protection across the entire temperature range, and improve the applicability of the air conditioner.

[0167] This application also proposes another multi-split air conditioner 100, see reference. Figure 7 As shown, the multi-split air conditioner 100 includes an indoor unit 10.

[0168] The multi-split air conditioner 100 includes an outdoor unit 20, which has at least two outdoor units 2 connected in parallel. The outdoor units 2 are installed outdoors. The indoor units and outdoor units 2 are connected by pipes for refrigerant flow.

[0169] The structure of the indoor unit and outdoor unit 2 in this embodiment is the same as that in the above embodiment, and will not be described again here.

[0170] The multi-split air conditioner 100 includes an ambient temperature detection device, the number of which is the same as the number of outdoor units 2, and is installed inside the corresponding outdoor unit 2.

[0171] The multi-split air conditioner 100 includes a controller, which is electrically connected to each ambient temperature detection device;

[0172] In this embodiment, the controller is configured to acquire the detection values ​​of each ambient temperature detection device, and trigger a defrosting procedure when the maximum difference between the detection values ​​is greater than a third preset threshold.

[0173] The multiple outdoor units 2 of the multi-split air conditioner 100 are in the same environment, and the detection values ​​of multiple ambient temperature detection devices should be close. If the difference is too large, it indicates that some outdoor units 2 may be frosted, and the corresponding ambient temperature detection device detection value is abnormal.

[0174] By comparing the detection values ​​between multiple outdoor units 2, without relying on historical data from a single detection device, outdoor units 2 with abnormal frost can be quickly identified, enabling targeted defrosting and improving the overall operating efficiency of the multi-split air conditioner 100.

[0175] In some embodiments, the multi-split air conditioner 100 first acquires the ambient temperature (Ta1, Ta2, etc.) detected by each detection device before starting the unit. When the maximum or minimum value detected by the ambient temperature detection device is within a first temperature range, it is determined that there is a risk of frosting. In some embodiments, the controller is configured to acquire the detection values ​​of each ambient temperature detection device after running for a fifth preset time. After running for a sixth preset time, it acquires the detection values ​​of each ambient temperature detection device.

[0176] If the difference between the values ​​detected by any ambient temperature detection device at the two times mentioned above reaches the fourth preset threshold, the defrosting procedure is triggered.

[0177] The above embodiment uses the difference between the detection value of a single outdoor unit 2 before it is turned on and the detection value after it has been running for a period of time to independently judge the frosting condition of a single outdoor unit 2 in the multi-split air conditioner 100, so as to avoid the overall operation being affected by the frosting of a certain unit.

[0178] In one embodiment, reference Figure 8 The diagram illustrates the defrosting logic for the multi-split air conditioner 100 when the ambient temperature is within the first temperature range.

[0179] The maximum or minimum value of the detected ambient temperature is within the first temperature range. After each ambient temperature detection device is started and has been running for the fifth preset time, the sixth ambient temperature is detected (S801), and this ambient temperature value is used as its own judgment value.

[0180] After running for the sixth preset time, the seventh ambient temperature (S805) of each ambient temperature detection device is obtained.

[0181] If the air conditioner runs continuously for longer than the sixth preset time, and if the difference between the seventh ambient temperature detected by the detection devices is too large, that is, the difference between the maximum and minimum values ​​of the seventh ambient temperature detected by each device is greater than the third preset threshold (S802), then it is determined that there is a possibility of abnormal frost, and the multi-split air conditioner 100 enters the defrosting program (S803).

[0182] In this embodiment, if the air conditioner runs continuously for a longer than a sixth preset time, and the difference between the sixth ambient temperature and the seventh ambient temperature detected by any detection device is greater than the fourth preset threshold (S804), it is determined that there is a possibility of abnormal frost formation, and the multi-split air conditioner 100 enters the defrosting program (S803).

[0183] It should be noted that the third preset threshold is lower than the fourth preset threshold. This is possible because the ambient temperature readings across multiple detection devices are more accurate, resulting in higher recognition accuracy. For example, the third preset threshold can be 2-3°C lower than the fourth preset threshold.

[0184] In this embodiment, if no detection device detects a difference between the sixth and seventh ambient temperatures greater than the fourth preset threshold after the sixth preset time has elapsed, or if the difference between the maximum and minimum values ​​of the ambient temperature detection devices after the sixth preset time has elapsed is not greater than the third preset threshold, then the traditional defrosting judgment logic is executed.

[0185] It should be noted that the above defrosting judgment logic refers to a judgment logic that does not use the detection difference of ambient temperature. For example, it uses the difference between the detection value of a single point ambient temperature and the temperature of the outdoor heat exchanger.

[0186] It should be noted that the second and fifth preset times can be the same or different, as long as the detection requirements are met. Similarly, the third and sixth preset times can be the same or different, as long as the detection requirements are met. In one embodiment, referring to... Figure 9 The diagram illustrates the defrosting control logic of the multi-split air conditioner 100.

[0187] S901, after executing the defrosting logic, obtains the time taken for this defrosting.

[0188] S902, determine whether the defrosting time has reached the set defrosting time.

[0189] In step S902, if the set defrosting time is reached, then step S903 is executed, and the next defrosting cycle is shortened.

[0190] In step S902, if the set defrosting time has not been reached, step S904 is executed to obtain the ambient temperature after the current defrosting operation ends, and the corresponding defrosting judgment logic is executed based on the ambient temperature range. That is, if the set defrosting time has not been reached, the operation is repeated based on the ambient temperature range. Figure 8 or Figure 10 The defrosting judgment logic in the middle.

[0191] In step S904 above, after the defrosting is completed, the ambient temperature detected by the ambient temperature detection device is obtained, and the corresponding defrosting judgment logic is executed according to whether the ambient temperature belongs to the first temperature range or the second temperature range.

[0192] In some embodiments, if the defrosting logic enters the defrosting program through the difference a set number of consecutive times, it is determined that one of the ambient temperature detection devices is malfunctioning. The wired controller can display the corresponding abnormal information for confirmation, or the controller can upload data to the cloud platform for confirmation.

[0193] In one embodiment, reference Figure 10 The diagram illustrates the defrosting logic of the multi-split air conditioner 100 when the ambient temperature is within the second temperature range.

[0194] S1001, obtain the detection values ​​of each ambient temperature detection device.

[0195] S1002, determine whether the detection values ​​of each ambient temperature detection device are all within the second temperature range.

[0196] In step S1002, if the detection values ​​of each ambient temperature detection device are all within the second temperature range, then step S1003 is executed to determine whether the shutdown time of each ambient temperature detection device has reached the preset shutdown time.

[0197] In step S1003, when the downtime reaches the preset downtime, step S1004 is executed to defrost at a set cycle.

[0198] In step S1003, if the shutdown time has not reached the preset shutdown time, step S1005 is executed, whereby the sixth ambient temperature is detected after each ambient temperature detection device is started and has been running for the fifth preset time.

[0199] After running for the sixth preset time, the seventh ambient temperature of each ambient temperature detection device is obtained (S1006).

[0200] If the air conditioner runs continuously for longer than the sixth preset time, and the difference between the sixth and seventh ambient temperatures detected by any detection device is greater than the fourth preset threshold, it is determined that there is a possibility of abnormal frost formation. At this time, the multi-split air conditioner 100 enters the defrosting program (S1007).

[0201] In step S1002, if the detection values ​​of each ambient temperature detection device are not all within the second temperature range, then step S1008 is executed to perform the defrosting judgment logic for other temperature ranges.

[0202] In one embodiment, if the minimum value detected by all ambient temperature detection devices is higher than the upper limit of the first temperature range, the traditional defrost control logic is directly used for the defrost judgment logic.

[0203] It should be noted that the above defrosting judgment logic refers to a judgment logic that does not use the detection difference of ambient temperature. For example, it uses the difference between the detection value of a single point ambient temperature and the temperature of the outdoor heat exchanger.

[0204] In the embodiments of this application, two defrosting judgment logics are employed: the temperature difference between ambient temperature detection devices and the temperature change value of a single ambient temperature detection device. Judging based on the temperature difference between the ambient temperature detection devices is superior to judging based on the temperature change value of a single ambient temperature detection device.

[0205] The above control methods effectively prevent problems such as excessively long defrosting intervals and thick ice layers caused by heat exchanger frosting and abnormally low ambient temperature readings, which in turn increase the unit's liquid return and affect its reliability. In multi-module operation, the comparison of ambient temperature readings between modules allows for more accurate risk identification. It should be noted that the parameters in this application are merely examples.

[0206] The air conditioner and multi-split air conditioner 100 proposed in this application include an outdoor casing, an outdoor heat exchanger disposed inside the outdoor casing, an ambient temperature detection device, and a controller. The ambient temperature detection device is disposed on one side of the outdoor heat exchanger and is used to detect the outdoor ambient temperature. The controller is electrically connected to the ambient temperature detection device and is configured to obtain a temperature change value based on the difference between the detection values ​​of the ambient temperature detection device before startup and after a preset running time. When the temperature change value is greater than a preset threshold, a defrosting program is triggered. The above method directly determines whether frost has formed by the difference in the ambient temperature detection value, eliminating the possibility of defrosting delays caused by inaccurate detection values ​​due to frost formation on the ambient temperature detection device itself. Based on the comparison of the detection values ​​before startup and after operation, the interference of natural cooling of the environment is eliminated. The risk of frost formation is accurately identified through the temperature difference threshold, avoiding false or missed triggering of defrosting and improving the timeliness and accuracy of defrosting.

[0207] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

[0208] For ease of explanation, the above description has been provided in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. Various modifications and variations can be obtained based on the above teachings. The selection and description of the above embodiments are for the purpose of better explaining the principles and practical applications, thereby enabling those skilled in the art to better utilize the embodiments and various different variations of the embodiments suitable for specific application considerations.

Claims

1. An air conditioner, characterized in that, include: Outdoor casing; An outdoor heat exchanger is located inside the outdoor casing; An ambient temperature detection device is installed on one side of the outdoor heat exchanger to detect the outdoor ambient temperature. The controller is electrically connected to the ambient temperature detection device; The controller is configured to acquire the ambient temperature detection values ​​of the air conditioner before it is turned on and after a preset running time. The temperature change value is obtained based on the difference between the two detected values. When the temperature change value is greater than a preset threshold, the defrosting procedure is triggered.

2. The air conditioner according to claim 1, characterized in that, The controller is configured to define the detection value of the ambient temperature detection device before power-on as a first ambient temperature, and when the first ambient temperature is within a first temperature range, determine that the ambient temperature detection device has a risk of frosting. After the first preset time after power-on, the second ambient temperature detected by the ambient temperature detection device is obtained; After running for a second preset time, the third ambient temperature detected by the ambient temperature detection device is obtained; When the difference between the third ambient temperature and the second ambient temperature exceeds the first preset threshold, it is determined that the surface of the ambient temperature detection device is frosted, and the defrosting procedure is triggered.

3. The air conditioner according to claim 2, characterized in that, The controller is configured to adjust the time of the next defrosting cycle based on whether the defrosting time in the defrosting program has reached the set defrosting time.

4. The air conditioner according to claim 1, characterized in that, The controller is configured to define the detection value of the ambient temperature detection device before power-on as a first ambient temperature, and when the first ambient temperature is within a second temperature range, determine that the risk of frost formation is smaller than when the first ambient temperature is within the first temperature range, wherein the upper limit of the second temperature range is not greater than the lower limit of the first temperature range. The system obtains the downtime of the air conditioner and turns it on when the downtime is less than the preset downtime. After running for a third preset time, the fourth ambient temperature detected by the ambient temperature detection device is obtained; After running for a fourth preset time, the fifth ambient temperature detected by the ambient temperature detection device is obtained. When the difference between the fifth ambient temperature and the fourth ambient temperature exceeds the second preset threshold, it is determined that the surface of the ambient temperature detection device is frosted, and the defrosting procedure is triggered.

5. The air conditioner according to claim 4, characterized in that, The controller is configured to trigger a defrosting procedure when the downtime is not less than a preset downtime.

6. The air conditioner according to claim 4 or 5, characterized in that, The controller is configured to adjust the time of the next defrosting cycle based on whether the defrosting time in the defrosting program has reached the set defrosting time.

7. The air conditioner according to claim 2 or 4, characterized in that, When the defrosting procedure is triggered multiple times consecutively by the difference, the ambient temperature detection device is determined to be malfunctioning.

8. The air conditioner according to claim 1, characterized in that, The controller is configured to define the ambient temperature detection device as a first ambient temperature before power-on, and to trigger a defrost procedure based on the difference between the ambient temperature detection device and the temperature of the outdoor heat exchanger when the first ambient temperature exceeds the upper limit of a first temperature range.

9. A multi-split air conditioner, characterized in that, include: An outdoor unit, wherein the outdoor unit comprises at least two outdoor units; An ambient temperature detection device, the number of which is the same as the number of outdoor units, and is installed inside the corresponding outdoor unit; The controller is electrically connected to the ambient temperature detection device; The controller is configured to acquire the detection values ​​of each of the ambient temperature detection devices, and trigger a defrosting procedure when the maximum difference between the detection values ​​is greater than a third preset threshold.

10. The multi-split air conditioner according to claim 9, characterized in that, The controller is configured to acquire the detection values ​​of each of the ambient temperature detection devices after the multi-split air conditioner has been running for a fifth preset time. After running for a sixth preset time, the detection values ​​of each of the ambient temperature detection devices are obtained; If the difference between the detection values ​​of any of the ambient temperature detection devices at the two times mentioned above reaches the fourth preset threshold, the defrosting procedure is triggered.

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