Air conditioner

Abstract

The invention relates to the technical field of household appliances, in particular to an air conditioner which comprises a refrigerant circulation loop, an outdoor fan, an outdoor temperature sensor, an outdoor coil pipe temperature sensor and a controller. The outdoor fan is controlled to operate at the initial rotating speed; after the first preset time, the rotating speed of the outdoor fan is adjusted according to a preset period, specifically, the temperature zone corresponding to the current outdoor environment temperature and the initial rotating speed are determined again, and the outdoor fan is controlled to operate at the initial rotating speed; according to the temperature zone corresponding to the current outdoor environment temperature, the current outdoor coil pipe temperature and the current outdoor environment temperature, the target operation gear of the outdoor fan is determined, and the outdoor fan is controlled to operate according to the target operation gear; in this way, self-adaptive cooperative control over the rotating speed of the outdoor fan, the outdoor environment temperature and the outdoor coil pipe temperature is established, and the operation power consumption of the outdoor fan can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and in particular to an air conditioner. Background Art

[0002] When the condensing temperature of the current air conditioner rises during use, the heat exchange capacity of the refrigeration system will decrease. This means that the hotter the weather, the more users need the air conditioner's cooling capacity, but the actual cooling capacity of the air conditioner cannot meet the user's needs. In addition, when the condensing temperature rises, the heat dissipation conditions of the power components of the variable frequency air conditioner also deteriorate. Hot weather, severe dirt and blockage in the outdoor unit grille, the outdoor heat exchanger, or the superposition of these three will further deteriorate its heat exchange capacity and the temperature rise of the power components.

[0003] In cooling operation under non-harsh working conditions (such as 20℃~40℃), as the room temperature gradually reaches the set temperature, the compressor operating frequency gradually decreases; if the room load is small, the compressor frequency will be reduced to the lowest frequency, or even shut down (stop the compressor) when the temperature is reached; when operating at medium and low frequencies, a large outdoor circulating air volume is not required, that is, when operating at medium and low frequencies, a large outdoor circulating air volume cannot improve the cooling capacity.

[0004] Therefore, on the whole, most of the existing air conditioners cannot operate at a reasonable fan speed when in use, resulting in relatively high energy efficiency of the whole machine and easily causing energy waste. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0006] To this end, the purpose of the present invention is to propose an air conditioner, which establishes adaptive coordinated control of the speed of the outdoor fan with the outdoor ambient temperature and the outdoor coil temperature, so that the speed of the outdoor fan can adaptively increase, decrease or remain unchanged according to the outdoor ambient temperature and the outdoor coil temperature, thereby helping to reduce the operating power consumption of the outdoor fan and ensure the optimal energy efficiency ratio of the air conditioner in the entire frequency band.

[0007] An embodiment of the present invention provides an air conditioner, which includes: a refrigerant circulation loop, which allows the refrigerant to circulate in a loop consisting of a compressor, a four-way valve, a condenser, an expansion valve, and an evaporator, wherein one of the condenser and the evaporator is an outdoor heat exchanger and the other is an indoor heat exchanger; an outdoor fan, which is used to discharge the heat released by the refrigerant in the condenser in a cooling mode; an outdoor temperature sensor, which is used to detect the outdoor ambient temperature; an outdoor coil temperature sensor, which is used to detect the outdoor coil temperature; and a controller, which is configured to: when the air conditioner is in cooling operation, determine the temperature zone corresponding to the current outdoor ambient temperature, and determine the temperature of the outdoor fan in the current temperature zone. and controlling the outdoor fan to operate at the initial speed; after the outdoor fan has operated at the initial speed for a first preset time, performing periodic speed adjustment of the outdoor fan according to a preset cycle, including: re-determining the temperature zone corresponding to the current outdoor ambient temperature, and re-determining the initial speed of the outdoor fan in the current temperature zone, and controlling the outdoor fan to operate at the initial speed, and determining a target operating gear of the outdoor fan according to the temperature zone corresponding to the current outdoor ambient temperature, the current outdoor coil temperature and the current outdoor ambient temperature, and controlling the outdoor fan to operate according to the target operating gear.

[0008] The above technical solution has the following advantages or beneficial effects: the air conditioner provided by the embodiment of the present invention includes a refrigerant circulation loop, an outdoor fan, an outdoor temperature sensor, an outdoor coil temperature sensor and a controller, the outdoor fan is used to discharge the heat released by the refrigerant in the condenser in the cooling mode, the outdoor temperature sensor is used to detect the outdoor ambient temperature, and the outdoor coil temperature sensor is used to detect the outdoor coil temperature. When the air conditioner is in cooling operation, the controller first determines the temperature zone corresponding to the current outdoor ambient temperature, and determines the initial speed of the outdoor fan in the current temperature zone, and controls the outdoor fan to run at the initial speed; after the outdoor fan runs at the initial speed for the first preset time, the outdoor fan is periodically adjusted in speed according to the preset cycle. The section includes: redetermining the temperature zone corresponding to the current outdoor ambient temperature, and redetermining the initial speed of the outdoor fan in the current temperature zone, and controlling the outdoor fan to operate at the initial speed, and determining the target operating gear of the outdoor fan according to the temperature zone corresponding to the current outdoor ambient temperature, the current outdoor coil temperature and the current outdoor ambient temperature, and controlling the outdoor fan to operate according to the target operating gear; thereby establishing adaptive coordinated control of the speed of the outdoor fan, the outdoor ambient temperature and the outdoor coil temperature, so that the speed of the outdoor fan can adaptively increase, decrease or remain unchanged according to the outdoor ambient temperature and the outdoor coil temperature, thereby helping to reduce the operating power consumption of the outdoor fan and ensure the optimal energy efficiency ratio of the air conditioner in the entire frequency band.

[0009] In addition, the air conditioner according to the embodiment of the present invention may also have the following additional technical features: Further, when determining the temperature zone corresponding to the current outdoor ambient temperature, the controller is configured as follows: when the current outdoor ambient temperature is between the first temperature interval, determining the corresponding temperature zone as the first temperature zone; or, when the current outdoor ambient temperature is between the second temperature interval, determining the corresponding temperature zone as the second temperature zone; or, when the current outdoor ambient temperature is between the third temperature interval, determining the corresponding temperature zone as the third temperature zone; or, when the current outdoor ambient temperature is between the fourth temperature interval, determining the corresponding temperature zone as the fourth temperature zone; wherein the upper temperature limit value of the first temperature interval is less than or equal to the lower temperature limit value of the second temperature interval, the upper temperature limit value of the second temperature interval is less than or equal to the lower temperature limit value of the third temperature interval, and the upper temperature limit value of the third temperature interval is less than or equal to the lower temperature limit value of the fourth temperature interval.

[0010] The above technical solution has the following advantages or beneficial effects: according to the air conditioner provided by the embodiment of the present invention, if the current outdoor ambient temperature is between the first temperature range, the controller determines that the corresponding temperature zone is the first temperature zone; if the current outdoor ambient temperature is between the second temperature range, the controller determines that the corresponding temperature zone is the second temperature zone; if the current outdoor ambient temperature is between the third temperature range, the controller determines that the corresponding temperature zone is the third temperature zone; if the current outdoor ambient temperature is between the fourth temperature range, the controller determines that the corresponding temperature zone is the fourth temperature zone; in this way, the temperature zone corresponding to the current outdoor ambient temperature can be determined, which is convenient for subsequent determination of the initial speed, gear adjustment trend and target gear according to the temperature zone.

[0011] Furthermore, a first transition temperature interval is provided between the first temperature interval and the second temperature interval, a second transition temperature interval is provided between the second temperature interval and the third temperature interval, and a third transition temperature interval is provided between the third temperature interval and the fourth temperature interval; when determining the temperature zone corresponding to the current outdoor ambient temperature, the controller is further configured to: when the current outdoor ambient temperature changes from the first temperature interval to the first transition temperature interval, determine that the corresponding temperature zone is the first temperature zone; or when the current outdoor ambient temperature changes from the second temperature interval to the first transition temperature interval, determine that the corresponding temperature zone is the first temperature zone. The corresponding temperature zone is the second temperature zone; or, when the current outdoor ambient temperature changes from the second temperature interval to the second transition temperature interval, the corresponding temperature zone is determined to be the second temperature zone; or, when the current outdoor ambient temperature changes from the third temperature interval to the second transition temperature interval, the corresponding temperature zone is determined to be the third temperature zone; or, when the current outdoor ambient temperature changes from the third temperature interval to the third transition temperature interval, the corresponding temperature zone is determined to be the third temperature zone; or, when the current outdoor ambient temperature changes from the fourth temperature interval to the third transition temperature interval, the corresponding temperature zone is determined to be the fourth temperature zone.

[0012] The above technical solution has the following advantages or beneficial effects: the air conditioner provided by the embodiment of the present invention sets a transition temperature interval between adjacent temperature intervals. When the outdoor environment changes from a certain temperature interval to an adjacent transition temperature zone, the corresponding temperature zone is the temperature zone corresponding to the temperature interval before the change, which can effectively prevent the gear from jumping and avoid the gear of the outdoor fan from jumping under specific conditions, thereby causing fluctuations in the entire refrigeration system.

[0013] Furthermore, when determining the initial speed of the outdoor fan in the current temperature zone, the controller is configured to: determine a first preset initial speed as the initial speed of the outdoor fan in the first temperature zone; or, determine a second preset initial speed as the initial speed of the outdoor fan in the second temperature zone; or, determine a third preset initial speed as the initial speed of the outdoor fan in the third temperature zone; or, determine a fourth preset initial speed as the initial speed of the outdoor fan in the fourth temperature zone.

[0014] The above technical solution has the following advantages or beneficial effects: according to the air conditioner provided by the embodiment of the present invention, the controller determines the first preset initial speed as the initial speed of the outdoor fan in the first temperature zone, determines the second preset initial speed as the initial speed of the outdoor fan in the second temperature zone, determines the third preset initial speed as the initial speed of the outdoor fan in the third temperature zone, and determines the fourth preset initial speed as the initial speed of the outdoor fan in the fourth temperature zone; in this way, the initial speed can be determined according to the temperature zone, which is convenient for preliminary adjustment of the speed of the outdoor fan according to the outdoor ambient temperature. Subsequently, the speed of the outdoor fan only needs to be further adjusted according to the outdoor ambient temperature, the outdoor coil temperature and the gear adjustment trend, thereby ensuring the adjustment efficiency.

[0015] Further, when determining the target operating gear of the outdoor fan based on the temperature zone corresponding to the current outdoor ambient temperature, the current outdoor coil temperature, and the current outdoor ambient temperature, the controller is configured to: when the temperature zone corresponding to the current outdoor ambient temperature is the fourth temperature zone, and within a preset detection period, the current outdoor coil temperature is greater than or equal to a first preset temperature value, and the current outdoor ambient temperature is greater than a second preset temperature value, determine that the target operating gear of the outdoor fan is increased by a first preset number of gears; or, when the temperature zone corresponding to the current outdoor ambient temperature is the fourth temperature zone, and within a preset detection period, the current outdoor coil temperature is less than a third preset temperature value, determine that the target operating gear of the outdoor fan is decreased by a second preset number of gears; or, when the temperature zone corresponding to the current outdoor ambient temperature is the fourth temperature zone, and within a preset detection period, the current outdoor coil temperature is less than the first preset temperature value, or the current outdoor ambient temperature is less than or equal to the second preset temperature value, or the current outdoor ambient temperature is greater than or equal to the third preset temperature value, determine that the target operating gear of the outdoor fan remains unchanged.

[0016] The above technical solution has the following advantages or beneficial effects: according to the air conditioner provided by the embodiment of the present invention, under the harsh working conditions represented by the fourth temperature zone, the target operating gear of the outdoor fan is determined according to the current outdoor coil temperature and the current outdoor ambient temperature, so as to facilitate the subsequent control of the outdoor fan to operate according to the target operating gear. The speed of the outdoor fan can adaptively increase, decrease or remain unchanged according to the outdoor ambient temperature and the outdoor coil temperature, which helps to reduce the operating power consumption of the outdoor fan and ensure the optimal energy efficiency ratio of the air conditioner in the entire frequency band.

[0017] Furthermore, when determining the target operating gear of the outdoor fan based on the temperature zone corresponding to the current outdoor ambient temperature, the current outdoor coil temperature and the current outdoor ambient temperature, the controller is configured to: when the temperature zone corresponding to the current outdoor ambient temperature is the second temperature zone or the third temperature zone, determine the difference between the current outdoor coil temperature and the current outdoor ambient temperature, and obtain the current outdoor ambient temperature to determine the lower limit value of the outdoor heat exchange temperature difference, the upper limit value of the outdoor heat exchange temperature difference, the lower limit value of the outdoor heat exchanger dirty and blocked outdoor heat exchange temperature difference, and the upper limit value of the outdoor heat exchanger dirty and blocked outdoor heat exchange temperature difference; and determine the target operating gear of the outdoor fan based on the comparison result of the difference with the lower limit value of the outdoor heat exchange temperature difference, the upper limit value of the outdoor heat exchange temperature difference, the lower limit value of the outdoor heat exchanger dirty and blocked outdoor heat exchange temperature difference, and the upper limit value of the outdoor heat exchanger dirty and blocked outdoor heat exchange temperature difference.

[0018] The above technical solution has the following advantages or beneficial effects: according to the air conditioner provided by the embodiment of the present invention, under the non-harsh working conditions represented by the second temperature zone or the third temperature zone, the target operating gear of the outdoor fan is determined according to the relationship between the heat exchange temperature difference and the heat exchange return difference band and the dirty and blocked return difference band, which is convenient for subsequent control of the outdoor fan to operate according to the target operating gear. The speed of the outdoor unit fan can adaptively increase, decrease or remain unchanged according to the outdoor ambient temperature and the outdoor coil temperature, which helps to reduce the operating power consumption of the outdoor fan and ensure the optimal energy efficiency ratio of the air conditioner in the entire frequency band.

[0019] Further, when determining the target operating gear of the outdoor fan based on a comparison result of the difference with the lower limit value of the outdoor heat exchange temperature difference, the upper limit value of the outdoor heat exchange temperature difference, the lower limit value of the outdoor heat exchanger dirty and blocked outdoor heat exchange temperature difference, and the upper limit value of the outdoor heat exchanger dirty and blocked outdoor heat exchange temperature difference, the controller is configured to: when the difference is greater than the lower limit value of the outdoor heat exchange temperature difference and less than the upper limit value of the outdoor heat exchanger dirty and blocked outdoor heat exchange temperature difference, determine that the target operating gear of the outdoor fan is the preset highest gear in the current temperature zone; and when the difference in the current detection period is less than or equal to the lower limit value of the outdoor heat exchange temperature difference, determine that the target operating gear of the outdoor fan is gradually reduced by one gear; or, When the difference in the current detection cycle is greater than the lower limit of the outdoor heat exchange temperature difference and less than the upper limit of the outdoor heat exchange temperature difference, it is determined that the target operating gear of the outdoor fan remains unchanged; or, when the difference in the current detection cycle is greater than the upper limit of the outdoor heat exchange temperature difference due to the outdoor heat exchanger being dirty and blocked, it is determined that the target operating gear of the outdoor fan is increased by one gear, and when the difference in the next detection cycle is less than the lower limit of the outdoor heat exchange temperature difference due to the outdoor heat exchanger being dirty and blocked, it is determined that the target operating gear of the outdoor fan is gradually decreased by one gear, or when the difference in the next detection cycle is greater than the lower limit of the outdoor heat exchange temperature difference and less than the upper limit of the outdoor heat exchange temperature difference, it is determined that the target operating gear of the outdoor fan remains unchanged.

[0020] The above technical solution has the following advantages or beneficial effects: according to the air conditioner provided by the embodiment of the present invention, under the non-harsh working conditions represented by the second temperature zone or the third temperature zone, the target operating gear of the outdoor fan is determined according to the relationship between the heat exchange temperature difference and the heat exchange return difference band and the dirty and blocked return difference band, which is convenient for subsequent control of the outdoor fan to operate according to the target operating gear. The speed of the outdoor unit fan can adaptively increase, decrease or remain unchanged according to the outdoor ambient temperature and the outdoor coil temperature, which helps to reduce the operating power consumption of the outdoor fan and ensure the optimal energy efficiency ratio of the air conditioner in the entire frequency band.

[0021] Furthermore, when determining that the target operating gear of the outdoor fan decreases gradually, the controller is configured to: control the outdoor fan to alternately perform a first action and a second action in sequence, wherein the first action includes: the target operating gear decreases by one gear within a preset execution cycle, and the second action includes: the target operating gear remains unchanged within multiple preset execution cycles.

[0022] The above technical solution has the following advantages or beneficial effects: according to the air conditioner provided by the embodiment of the present invention, when determining the gradient decrease of the target operating gear of the outdoor fan, the controller controls the outdoor fan to alternately perform the first action and the second action in sequence, the first action being that the target operating gear is reduced by one gear within a preset execution cycle, and the second action being that the target operating gear remains unchanged within multiple preset execution cycles; thereby, it is possible to avoid the downshifting speed being too fast and the temperature changing too fast, thereby ensuring the stability of the air conditioner operation.

[0023] Furthermore, the lower limit value of the outdoor heat exchange temperature difference and the lower limit value of the outdoor heat exchange temperature difference due to dirty or blocked outdoor heat exchanger are both configured to be inversely proportional to the change trend of the current outdoor ambient temperature.

[0024] The above technical solution has the following advantages or beneficial effects: according to the air conditioner provided by the embodiment of the present invention, by determining that the lower boundary of the outdoor heat exchange temperature difference critical value and the lower boundary of the outdoor heat exchange temperature difference critical value under dirt blockage both increase as the outdoor temperature decreases, the gear change can be avoided from oscillating back and forth, thereby ensuring the stability of the air conditioner operation.

[0025] Furthermore, the difference between the upper limit value of the outdoor heat exchange temperature difference and the lower limit value of the outdoor heat exchange temperature difference, and the difference between the upper limit value of the outdoor heat exchange temperature difference when the outdoor heat exchanger is dirty and blocked and the lower limit value of the outdoor heat exchange temperature difference when the outdoor heat exchanger is dirty and blocked are both configured to be inversely proportional to the change trend of the current outdoor ambient temperature.

[0026] The above technical solution has the following advantages or beneficial effects: according to the air conditioner provided by the embodiment of the present invention, by determining that the bandwidth of the heat exchange hysteresis band and the bandwidth of the dirty and blocked hysteresis band both increase as the outdoor temperature decreases; thereby, the periodic oscillation phenomenon caused by gear changes can be avoided, thereby ensuring the stability of the air conditioner operation.

[0027] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which: Figure 1 is a schematic diagram of a refrigeration cycle system of an air conditioner according to an embodiment of the present invention; Figure 2 is a schematic structural diagram of a controller according to an embodiment of the present invention; Figure 3 is a structural diagram of an air conditioner according to an embodiment of the present invention; Figure 4This is a schematic diagram of temperature zone division according to a specific embodiment of the present invention; Figure 5 is a schematic diagram of the relationship between the speed and gear position of an outdoor fan according to a specific embodiment of the present invention; Figure 6 It is a schematic diagram of determining the gear position of an outdoor fan according to a specific embodiment of the present invention. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0031] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0032] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0033] Figure 1 FIG. 1 is a schematic diagram of a refrigeration cycle system of an air conditioner according to an embodiment of the present invention. Figure 1As shown, one of the indoor and outdoor heat exchangers is a condenser, and the other is an evaporator. The air conditioner of the present invention utilizes a compressor, condenser, expansion valve, evaporator, and four-way valve to perform a refrigeration cycle. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, supplying refrigerant to the conditioned and heat-exchanged air.

[0034] The compressor compresses the high-temperature, high-pressure refrigerant gas entering through the return pipe and discharges the compressed refrigerant through the exhaust pipe. The discharged refrigerant gas flows into the condenser through the condenser inlet pipe. The condenser condenses the compressed refrigerant into a liquid phase, releasing heat into the surrounding environment through the condensation process.

[0035] The indoor heat exchanger and the outdoor heat exchanger function as a condenser or an evaporator. When the indoor heat exchanger functions as a condenser, the air conditioner functions as a heater in heating mode, and when the indoor heat exchanger functions as an evaporator, the air conditioner functions as a cooler in cooling mode.

[0036] The expansion valve expands the high-temperature, high-pressure liquid refrigerant condensed in the condenser and discharged through the condenser outlet pipe into a low-pressure liquid refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the low-temperature, low-pressure refrigerant gas to the compressor. The evaporator achieves a cooling effect by utilizing the latent heat of evaporation of the refrigerant to exchange heat with the material being cooled. Throughout this cycle, the air conditioner regulates the temperature of the indoor space.

[0037] In the embodiment shown in this application, the air conditioner further includes a controller 71. Controller 71 is a device that generates an operational control signal based on an instruction opcode and a timing signal, thereby instructing the air conditioner to execute the control instruction. For example, in response to a power-on or power-off instruction received from a user, controller 71 may execute an operation related to the object selected by the power-on or power-off instruction.

[0038] The embodiment of the present application also provides a hardware structure diagram of a controller 71, such as Figure 2 As shown, the controller 71 includes a processor 83 and, optionally, a memory 82 and a communication interface 84 connected to the processor 83. The processor 83, the memory 82 and the communication interface 84 are connected via a bus 81.

[0039] The processor 83 may be a central processing unit (CPU), a general-purpose processor (GP), a network processor (NP), a digital signal processor (DSP), a microprocessor (MCU), a microcontroller (MCU), a programmable logic device (PLD), or any combination thereof. The processor 83 may also be any other device having a processing function, such as a circuit, a device, or a software module. The processor 83 may also include multiple CPUs, and the processor 83 may be a single-CPU processor or a multi-CPU processor. The processor 83 herein may refer to one or more devices, circuits, or processing cores for processing data (e.g., computer program instructions).

[0040] The memory 82 can be a read-only memory 82 (ROM) or other types of static storage devices that can store static information and instructions, a random access memory 82 (RAM) or other types of dynamic storage devices that can store information and instructions, or an electrically erasable programmable read-only memory 82 (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed optical discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), a magnetic disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store desired program codes in the form of instructions or data structures and can be accessed by a computer. The embodiments of the present application do not impose any restrictions on this. The memory 82 can exist independently or be integrated with the processor 83. Among them, the memory 82 can contain computer program code. The processor 83 is used to execute the computer program code stored in the memory 82, thereby realizing the control method of the air conditioner provided in the embodiments of the present application.

[0041] The communication interface 84 can be used to communicate with other devices or communication networks (such as Ethernet, radio access network (RAN), wireless local area network (WLAN), etc.). The communication interface 84 can be a module, a circuit, a transceiver or any device that can achieve communication.

[0042] The bus 81 may be a peripheral component interconnect (PCI) bus 81 or an extended industry standard architecture (EISA) bus 81. The bus 81 may be divided into an address bus 81, a data bus 81, a control bus 81, and the like.

[0043] The following combination Figure 3-Figure 6 An air conditioner according to an embodiment of the present invention is described.

[0044] With the improvement of energy efficiency, the type of outdoor fan is mainly DC fan, and its speed can be set arbitrarily within a certain range. Conventional air conditioners divide the outdoor ambient temperature into four temperature zones: low temperature zone, medium temperature zone, high temperature zone, and ultra-high temperature zone, and set a fixed speed for each temperature zone.

[0045] The current outdoor temperature range applicable to household air-conditioning cooling operation has been greatly widened. The upper limit of the ultra-high temperature zone can reach 60°C (bad weather combined with the outdoor unit grille position and the outdoor heat exchanger being dirty and blocked). Since the compressor has an exhaust pressure upper limit and the power device also has a temperature rise upper limit, the compressor frequency can only be reduced. At this time, the output capacity of the air conditioner is greatly reduced, and it may even fail to cool normally. The lower limit of the low temperature zone has fallen below 0°C, and the condensing temperature has also dropped significantly, resulting in an unqualified compression ratio.

[0046] In addition, as the insulation performance of newly built rooms improves, the actual load of the rooms is decreasing, and the air conditioner can easily run at a low frequency. However, the heat exchange performance at this time no longer requires a large circulating air volume. The air volume of high-speed operation is redundant, and the fan speed needs to be appropriately reduced to improve the overall EER (Energy Efficiency Ratio).

[0047] The outdoor heat exchange temperature difference △Tout (△Tout = condensing temperature Tc - outdoor temperature Tout) represents the heat exchange intensity of the condenser. When the outdoor ambient temperature is higher, other environmental parameters (such as indoor temperature and humidity) remain unchanged, and control component parameters such as outdoor fan speed, compressor frequency, and expansion valve opening (this parameter does not exist if the throttling element is a capillary tube or a throttling short tube) remain unchanged, △Tout decreases as the outdoor temperature Tout rises.

[0048] The outdoor ambient temperature is in the ultra-high temperature range (it is also possible that the outdoor unit is installed in a prison grille position, and the air conditioner is cooling. The hot air blown out by the outdoor unit cannot be dissipated due to the grille and is blown back, causing the actual outdoor unit ambient temperature to be 10-20°C higher than the actual ambient temperature. For example, the ambient temperature is only 35°C, but the ambient temperature detected in the prison grille position can be as high as 50°C or above). When the condensing temperature rises, the heat exchange capacity of the refrigeration system will decrease. The hotter the weather, the more cooling capacity the user needs from the air conditioner, but the actual cooling capacity of the air conditioner cannot meet the user's needs. In addition, when the condensing temperature rises, the heat dissipation conditions of the power components of the variable frequency air conditioner also deteriorate, and there is a risk of burning and breakdown. Hot weather, severe dirt and blockage in the outdoor unit grille position, the outdoor heat exchanger, or the combination of these three will further deteriorate its heat exchange capacity and the temperature rise of the power components.

[0049] The medium and high temperature zones are cooling operations under non-harsh working conditions (e.g., 20°C ~ 40°C). As the room temperature gradually reaches the set temperature, the compressor operating frequency also gradually decreases. If the room load is small, the compressor frequency will be reduced to the lowest frequency, or even shut down (stop the compressor) when the temperature is reached. There is a marginal effect on the outdoor fan speed (because the outdoor fan speed cannot be increased due to the nameplate noise limit, here refers to the marginal effect when the outdoor fan speed decreases). When the outdoor temperature and other working parameters are constant, the outdoor heat exchange temperature difference of the air-conditioning system is lower than the critical value (the air-conditioning system is in the low load zone), and the outdoor fan power The weight is relatively high, which has a great impact on the energy efficiency of the whole machine. When operating at medium and low frequencies, a large outdoor circulation air volume is not required. That is, when operating at medium and low frequencies, a large outdoor circulation air volume cannot significantly improve the cooling capacity. Properly reducing the speed of the outdoor fan can not only meet the heat exchange demand of the outdoor heat exchanger (the cooling capacity is only slightly reduced), but also greatly reduce the power of the outdoor fan. For example: when the operating parameters such as the outdoor temperature are constant, the heat exchange temperature difference △Tout of the refrigeration cycle is lower than the critical value (the refrigeration cycle is in the low load zone). When the speed of the outdoor fan is reduced, its output capacity is reduced by △Q and the power of the whole machine is reduced by △W. (Equation 1) , that is, at low load, the original circulating air volume is redundant, and the outdoor fan speed is appropriately reduced, the EER of the whole machine will increase instead.

[0050] In formula 1 The energy efficiency after speed reduction, EER, Q, W are the energy efficiency of original speed, output capacity, and whole machine power respectively; different outdoor temperatures have different critical values, and the critical value decreases as the outdoor temperature increases. You can test the demarcation points Tout1, Tout2, and Tout3 in each temperature zone to determine the lower boundary of the outdoor heat exchange temperature difference critical value. This value increases as the outdoor temperature decreases. A hysteresis band should also be set, and the bandwidth of the hysteresis band will become wider as the outdoor temperature decreases. Otherwise, the outdoor fan speed will produce periodic oscillations (for example, when Tc≤3 ℃, reducing the outdoor fan speed, but the speed reduction causes Tc>3℃, and the outdoor fan speed rises again, resulting in periodic oscillation of the outdoor fan; if the set hysteresis band width is 1℃, Tc≤3℃, reducing the outdoor fan speed will cause Tc to rise to 3.5℃, but it is still less than the upper limit of the critical hysteresis band of 4℃, and the outdoor fan speed remains unchanged, thus avoiding the outdoor fan oscillation phenomenon); therefore, the significance of the hysteresis band is to ensure the existence of an outdoor fan speed, and the heat exchange temperature difference can be stabilized within the hysteresis band to avoid oscillation of the outdoor fan speed. The lower the outdoor temperature, the wider the hysteresis band is mainly because for the same value △R of the outdoor speed change, the lower the outdoor temperature, the better the heat exchange performance, and the greater the change in the outdoor heat exchange temperature difference. For example, the critical values ​​of the outdoor heat exchange temperature difference of Tout1, Tout2, and Tout3 are 10℃, 5℃, and 1℃, respectively, and the bandwidths of the hysteresis band are 6℃, 3℃, and 1℃, respectively. In this way, the upper limits of the critical values ​​of the outdoor heat exchange temperature difference are 16℃, 8℃, and 2℃, respectively. At any outdoor temperature between Tout1 and Tout3, the critical value of the outdoor heat exchange temperature difference and the upper limit of the critical value of the outdoor heat exchange temperature difference can be calculated by interpolation.

[0051] Furthermore, if the air conditioner's outdoor unit is installed outdoors, the condenser will, over time, become clogged with dust and dirt, even attracting flocculent matter. This will gradually reduce the condenser's heat exchange capacity and increase the condensing temperature, reducing cooling capacity and significantly increasing overall unit power. This means the air conditioner becomes less energy-efficient over time. Therefore, if the outdoor heat exchanger can be identified as severely clogged, the outdoor fan speed will be forcibly increased (the outdoor fan speed before the increase is generally determined by the noise level indicated on the outdoor unit's nameplate. After the outdoor fan is increased, the air conditioner will already be installed in the user's home, eliminating the risk of the outdoor noise level exceeding the nameplate value during national random inspections. The noise level is specified as tested under rated cooling conditions, which fall within the high-temperature range). This improves heat exchange capacity, boosts cooling capacity, and reduces overall unit power. Generally speaking, at the same ambient temperature, for an air conditioner with a clean outdoor heat exchanger, the outdoor heat exchange temperature difference has an upper limit, which decreases with rising outdoor temperature. If the outdoor heat exchange temperature difference exceeds this upper limit, it can be considered that the outdoor heat exchanger is severely clogged. Similarly, when the outdoor fan speed increases, the condensing temperature Tc decreases, and accordingly, the outdoor heat exchange temperature difference ΔTout also decreases. Therefore, a hysteresis band must be set to calculate the lower limit of the outdoor heat exchange temperature difference for a dirty or clogged outdoor heat exchanger. Otherwise, the outdoor fan will oscillate back and forth. This is the lower limit of the critical outdoor heat exchange temperature difference for dirty or clogged conditions. This value increases as the outdoor temperature decreases, and the bandwidth of the dirty or clogged hysteresis band increases as the outdoor temperature decreases.

[0052] In response to the above requirements, an embodiment of the present invention provides an air conditioner that can adapt to the requirements of compressor reliability and overall energy efficiency in different temperature zones: Figure 3 FIG. 1 is a structural diagram of an air conditioner according to an embodiment of the present invention. Figure 3As shown, an air conditioner 10 includes: a refrigerant circulation circuit, which circulates the refrigerant in a circuit consisting of a compressor, a four-way valve, a condenser, an expansion valve, and an evaporator, wherein one of the condenser and the evaporator is an outdoor heat exchanger and the other is an indoor heat exchanger; an outdoor fan 11, which is used to discharge the heat released by the refrigerant in the condenser in the cooling mode; an outdoor temperature sensor 12, which is used to detect the outdoor ambient temperature; an outdoor coil temperature sensor 13, which is used to detect the outdoor coil temperature; a controller 71, which is configured to: when the air conditioner 10 is in cooling operation, determine the temperature zone corresponding to the current outdoor ambient temperature, and determine the temperature zone of the outdoor fan 11 in the cooling mode. The outdoor fan 11 is controlled to run at the initial speed in the current temperature zone; after the outdoor fan 11 runs at the initial speed for the first preset time, the outdoor fan 11 is periodically adjusted in speed according to a preset cycle, including: re-determining the temperature zone corresponding to the current outdoor ambient temperature, and re-determining the initial speed of the outdoor fan 11 in the current temperature zone, and controlling the outdoor fan 11 to run at the initial speed, and determining the target operating gear of the outdoor fan 11 according to the temperature zone corresponding to the current outdoor ambient temperature, the current outdoor coil temperature and the current outdoor ambient temperature, and controlling the outdoor fan 11 to run according to the target operating gear.

[0053] In a specific embodiment, the outdoor fan 11 is used to discharge the heat released by the refrigerant in the condenser in the cooling mode, the outdoor temperature sensor 12 is used to detect the outdoor ambient temperature, and the outdoor coil temperature sensor 13 is used to detect the outdoor coil temperature. When the air conditioner 10 is in cooling operation, the controller 71 first determines the temperature zone corresponding to the current outdoor ambient temperature, and determines the initial speed of the outdoor fan 11 in the current temperature zone, and controls the outdoor fan 11 to operate at the initial speed; after the outdoor fan 11 runs at the initial speed for the first preset time, the outdoor fan 11 is periodically adjusted in accordance with a preset cycle, including: re-determining the temperature zone corresponding to the current outdoor ambient temperature, and re-determining the initial speed of the outdoor fan 11 in the current temperature zone, and controlling the outdoor fan 11 to operate at the initial speed, and determining the target operating gear of the outdoor fan 11 according to the temperature zone corresponding to the current outdoor ambient temperature, the current outdoor coil temperature and the current outdoor ambient temperature, and controlling the outdoor fan 11 to operate according to the target operating gear. Specifically, the temperature zones corresponding to the outdoor ambient temperature from low to high include, for example, low temperature zone, medium temperature zone, high temperature zone and ultra-high temperature zone, and different temperature zones correspond to different initial speeds of the outdoor fan 11. The first preset time is, for example, 2 minutes, and the preset period is, for example, 2 minutes.

[0054] Specifically, the air conditioner 10 provided according to the embodiment of the present invention includes a refrigerant circulation loop, an outdoor fan 11, an outdoor temperature sensor 12, an outdoor coil temperature sensor 13 and a controller 71. The outdoor fan 11 is used to discharge the heat released by the refrigerant in the condenser in the cooling mode, the outdoor temperature sensor 12 is used to detect the outdoor ambient temperature, and the outdoor coil temperature sensor 13 is used to detect the outdoor coil temperature. When the air conditioner 10 is in cooling operation, the controller 71 first determines the temperature zone corresponding to the current outdoor ambient temperature, and determines the initial speed of the outdoor fan 11 in the current temperature zone, and controls the outdoor fan 11 to run at the initial speed; after the outdoor fan 11 runs at the initial speed for the first preset time, the outdoor fan 11 is periodically adjusted in speed according to the preset cycle. The section includes: redetermining the temperature zone corresponding to the current outdoor ambient temperature, and redetermining the initial speed of the outdoor fan 11 in the current temperature zone, and controlling the outdoor fan 11 to operate at the initial speed, and determining the target operating gear of the outdoor fan 11 according to the temperature zone corresponding to the current outdoor ambient temperature, the current outdoor coil temperature and the current outdoor ambient temperature, and controlling the outdoor fan 11 to operate according to the target operating gear; thereby establishing adaptive coordinated control of the speed of the outdoor fan 11, the outdoor ambient temperature and the outdoor coil temperature, so that the speed of the outdoor fan 11 can adaptively increase, decrease or remain unchanged according to the outdoor ambient temperature and the outdoor coil temperature, thereby helping to reduce the operating power consumption of the outdoor fan 11 and ensuring the optimal energy efficiency ratio of the air conditioner 10 in the entire frequency band.

[0055] In one embodiment of the present invention, when determining the temperature zone corresponding to the current outdoor ambient temperature, the controller 71 is configured as follows: when the current outdoor ambient temperature is between the first temperature interval, the corresponding temperature zone is determined to be the first temperature zone; or, when the current outdoor ambient temperature is between the second temperature interval, the corresponding temperature zone is determined to be the second temperature zone; or, when the current outdoor ambient temperature is between the third temperature interval, the corresponding temperature zone is determined to be the third temperature zone; or, when the current outdoor ambient temperature is between the fourth temperature interval, the corresponding temperature zone is determined to be the fourth temperature zone; wherein, the upper temperature limit value of the first temperature interval is less than or equal to the lower temperature limit value of the second temperature interval, the upper temperature limit value of the second temperature interval is less than or equal to the lower temperature limit value of the third temperature interval, and the upper temperature limit value of the third temperature interval is less than or equal to the lower temperature limit value of the fourth temperature interval.

[0056] In a specific embodiment, if the current outdoor ambient temperature is between the first temperature interval, the controller 71 determines that the corresponding temperature zone is the first temperature zone; if the current outdoor ambient temperature is between the second temperature interval, the controller 71 determines that the corresponding temperature zone is the second temperature zone; if the current outdoor ambient temperature is between the third temperature interval, the controller 71 determines that the corresponding temperature zone is the third temperature zone; if the current outdoor ambient temperature is between the fourth temperature interval, the controller 71 determines that the corresponding temperature zone is the fourth temperature zone. Specifically, the upper temperature limit of the first temperature interval is less than or equal to the lower temperature limit of the second temperature interval, the upper temperature limit of the second temperature interval is less than or equal to the lower temperature limit of the third temperature interval, and the upper temperature limit of the third temperature interval is less than or equal to the lower temperature limit of the fourth temperature interval. The first temperature zone can be defined as a low temperature zone, the second temperature zone can be defined as a medium temperature zone, the third temperature zone can be defined as a high temperature zone, and the fourth temperature zone can be defined as an ultra-high temperature zone.

[0057] Specifically, according to the air conditioner 10 provided by an embodiment of the present invention, if the current outdoor ambient temperature is between the first temperature range, the controller 71 determines that the corresponding temperature zone is the first temperature zone; if the current outdoor ambient temperature is between the second temperature range, the controller 71 determines that the corresponding temperature zone is the second temperature zone; if the current outdoor ambient temperature is between the third temperature range, the controller 71 determines that the corresponding temperature zone is the third temperature zone; if the current outdoor ambient temperature is between the fourth temperature range, the controller 71 determines that the corresponding temperature zone is the fourth temperature zone; in this way, the temperature zone corresponding to the current outdoor ambient temperature can be determined, which facilitates the subsequent determination of the initial speed, gear adjustment trend and target gear according to the temperature zone.

[0058] In one embodiment of the present invention, a first transition temperature interval is provided between the first temperature interval and the second temperature interval, a second transition temperature interval is provided between the second temperature interval and the third temperature interval, and a third transition temperature interval is provided between the third temperature interval and the fourth temperature interval. When determining the temperature zone corresponding to the current outdoor ambient temperature, the controller 71 is further configured to: when the current outdoor ambient temperature changes from the first temperature interval to the first transition temperature interval, determine the corresponding temperature zone as the first temperature zone; or, when the current outdoor ambient temperature changes from the second temperature interval to the first transition temperature interval, determine the corresponding temperature zone as the second temperature zone; or, when the current outdoor ambient temperature changes from the second temperature interval to the second transition temperature interval, determine the corresponding temperature zone as the second temperature zone; or, when the current outdoor ambient temperature changes from the third temperature interval to the second transition temperature interval, determine the corresponding temperature zone as the third temperature zone; or, when the current outdoor ambient temperature changes from the third temperature interval to the third transition temperature interval, determine the corresponding temperature zone as the third temperature zone; or, when the current outdoor ambient temperature changes from the fourth temperature interval to the third transition temperature interval, determine the corresponding temperature zone as the fourth temperature zone.

[0059] In a specific embodiment, a transition temperature interval is further provided between adjacent temperature intervals. When the outdoor environment changes from a certain temperature interval to an adjacent transition temperature interval, the corresponding temperature interval is the temperature interval corresponding to the temperature interval before the change. Specifically, if the current outdoor environment temperature changes from the first temperature interval to the first transition temperature interval, the controller 71 determines that the corresponding temperature interval is the first temperature interval; if the current outdoor environment temperature changes from the second temperature interval to the first transition temperature interval, the controller 71 determines that the corresponding temperature interval is the second temperature interval; if the current outdoor environment temperature changes from the second temperature interval to the second transition temperature interval, the controller 71 determines that the corresponding temperature interval is the second temperature interval; if the current outdoor environment temperature changes from the third temperature interval to the second transition temperature interval, the controller 71 determines that the corresponding temperature interval is the third temperature interval; if the current outdoor environment temperature changes from the third temperature interval to the third transition temperature interval, the controller 71 determines that the corresponding temperature interval is the third temperature interval; and if the current outdoor environment temperature changes from the fourth temperature interval to the third transition temperature interval, the controller 71 determines that the corresponding temperature interval is the fourth temperature zone.

[0060] Specifically, according to the air conditioner 10 provided by the embodiment of the present invention, if the current outdoor ambient temperature changes from the first temperature interval to the first transition temperature interval, the controller 71 determines that the corresponding temperature zone is the first temperature zone; if the current outdoor ambient temperature changes from the second temperature interval to the first transition temperature interval, the controller 71 determines that the corresponding temperature zone is the second temperature zone; if the current outdoor ambient temperature changes from the second temperature interval to the second transition temperature interval, the controller 71 determines that the corresponding temperature zone is the second temperature zone; if the current outdoor ambient temperature changes from the third temperature interval to the second transition temperature interval, the controller 71 determines that the corresponding temperature zone is the third temperature zone; if When the current outdoor ambient temperature changes from the third temperature interval to the third transition temperature interval, the controller 71 determines that the corresponding temperature zone is the third temperature zone; if the current outdoor ambient temperature changes from the fourth temperature interval to the third transition temperature interval, the controller 71 determines that the corresponding temperature zone is the fourth temperature zone; in this way, by setting a transition temperature interval between adjacent temperature intervals, when the outdoor environment changes from a certain temperature interval to an adjacent transition temperature zone, the corresponding temperature zone is the temperature zone corresponding to the temperature interval before the change, which can effectively prevent the gear from jumping and avoid the gear of the outdoor fan 11 from jumping under specific conditions, thereby causing the entire refrigeration system to fluctuate.

[0061] In one embodiment of the present invention, when determining the initial speed of the outdoor fan 11 in the current temperature zone, the controller 71 is configured to: determine the first preset initial speed as the initial speed of the outdoor fan 11 in the first temperature zone; or, determine the second preset initial speed as the initial speed of the outdoor fan 11 in the second temperature zone; or, determine the third preset initial speed as the initial speed of the outdoor fan 11 in the third temperature zone; or, determine the fourth preset initial speed as the initial speed of the outdoor fan 11 in the fourth temperature zone.

[0062] In a specific embodiment, different temperature zones correspond to different initial speeds of the outdoor fan 11. Specifically, the initial speed of the outdoor fan 11 in the first temperature zone is a first preset initial speed, the initial speed of the outdoor fan 11 in the second temperature zone is a second preset initial speed, the initial speed of the outdoor fan 11 in the third temperature zone is a third preset initial speed, and the initial speed of the outdoor fan 11 in the fourth temperature zone is a fourth preset initial speed. The first preset initial speed, the second preset initial speed, the third preset initial speed, and the fourth preset initial speed are set as needed, and the first preset initial speed, the second preset initial speed, the third preset initial speed, and the fourth preset initial speed increase in sequence.

[0063] Specifically, according to the air conditioner 10 provided in an embodiment of the present invention, the controller 71 determines the first preset initial speed as the initial speed of the outdoor fan 11 in the first temperature zone, determines the second preset initial speed as the initial speed of the outdoor fan 11 in the second temperature zone, determines the third preset initial speed as the initial speed of the outdoor fan 11 in the third temperature zone, and determines the fourth preset initial speed as the initial speed of the outdoor fan 11 in the fourth temperature zone; in this way, the initial speed can be determined according to the temperature zone, which facilitates the preliminary adjustment of the speed of the outdoor fan 11 according to the outdoor ambient temperature. Subsequently, the speed of the outdoor fan 11 only needs to be further adjusted according to the outdoor ambient temperature, the outdoor coil temperature and the gear adjustment trend, thereby ensuring the adjustment efficiency.

[0064] In one embodiment of the present invention, when determining the target operating gear of the outdoor fan 11 based on the temperature zone corresponding to the current outdoor ambient temperature, the current outdoor coil temperature, and the current outdoor ambient temperature, the controller 71 is configured to: when the temperature zone corresponding to the current outdoor ambient temperature is the fourth temperature zone, and within a preset detection period, the current outdoor coil temperature is greater than or equal to the first preset temperature value, and the current outdoor ambient temperature is greater than the second preset temperature value, determine that the target operating gear of the outdoor fan 11 is increased by a first preset number of gears; or, when the temperature zone corresponding to the current outdoor ambient temperature is the fourth temperature zone, and within the preset detection period, the current outdoor coil temperature is less than the third preset temperature value, determine that the target operating gear of the outdoor fan 11 is decreased by a second preset number of gears; or, when the temperature zone corresponding to the current outdoor ambient temperature is the fourth temperature zone, and within the preset detection period, the current outdoor coil temperature is less than the first preset temperature value, or the current outdoor ambient temperature is less than or equal to the second preset temperature value, or the current outdoor ambient temperature is greater than or equal to the third preset temperature value, determine that the target operating gear of the outdoor fan 11 remains unchanged.

[0065] In a specific embodiment, the temperature zone corresponding to the current outdoor ambient temperature is the fourth temperature zone, and if, within a preset detection period, the current outdoor coil temperature is greater than or equal to a first preset temperature value, and the current outdoor ambient temperature is greater than a second preset temperature value, the controller 71 determines that the target operating gear of the outdoor fan 11 is increased by a first preset number of gears. Specifically, the fourth temperature zone can be defined as an ultra-high temperature zone, the preset detection period is, for example, 2 minutes, the first preset temperature value, the second preset temperature value, and the first preset number are set as needed, the first preset temperature value being, for example, one of 50°C and 55°C, the second preset temperature value being, for example, 45°C, and the first preset number being, for example, 1.

[0066] In a specific embodiment, the temperature zone corresponding to the current outdoor ambient temperature is the fourth temperature zone, and if the current outdoor coil temperature is less than a third preset temperature value within a preset detection period, the controller 71 determines that the target operating gear of the outdoor fan 11 is lowered by a second preset number of gears. Specifically, the fourth temperature zone can be defined as an ultra-high temperature zone. The preset detection period is, for example, 2 minutes. The third preset temperature value and the second preset number are set as needed. The third preset temperature value is, for example, one of 15°C and 18°C, and the second preset number is, for example, 1.

[0067] In a specific embodiment, the temperature zone corresponding to the current outdoor ambient temperature is the fourth temperature zone, and within a preset detection period, if the current outdoor coil temperature is less than the first preset temperature value, or the current outdoor ambient temperature is less than or equal to the second preset temperature value, or the current outdoor ambient temperature is greater than or equal to the third preset temperature value, the controller 71 determines that the target operating gear of the outdoor fan 11 remains unchanged. Specifically, the fourth temperature zone can be defined as an ultra-high temperature zone, with the preset detection period being, for example, 2 minutes. The first, second, and third preset temperature values ​​are set as needed, with the first preset temperature value being, for example, one of 50°C and 55°C, the second preset temperature value being, for example, 45°C, and the third preset temperature value being, for example, one of 15°C and 18°C.

[0068] Specifically, according to the air conditioner 10 provided in the embodiment of the present invention, the fourth temperature zone represents a severe working condition, and the target operating gear of the outdoor fan 11 is determined according to the current outdoor coil temperature and the current outdoor ambient temperature: the temperature zone corresponding to the current outdoor ambient temperature is the fourth temperature zone, and within the preset detection period, the current outdoor coil temperature is greater than or equal to the first preset temperature value, and the current outdoor ambient temperature is greater than the second preset temperature value, the controller 71 determines that the target operating gear of the outdoor fan 11 is increased by a first preset number of gears; or, the temperature zone corresponding to the current outdoor ambient temperature is the fourth temperature zone, and within the preset detection period, the current outdoor coil temperature is less than the third preset temperature value, the controller determines that the target operating gear of the outdoor fan 11 is decreased by a second preset number of gears; or The temperature zone corresponding to the outdoor ambient temperature is the fourth temperature zone, and within the preset detection period, when the current outdoor coil temperature is less than the first preset temperature value, or the current outdoor ambient temperature is less than or equal to the second preset temperature value, or the current outdoor ambient temperature is greater than or equal to the third preset temperature value, it is determined that the target operating gear of the outdoor fan 11 remains unchanged; in this way, under the harsh working conditions represented by the fourth temperature zone, the target operating gear of the outdoor fan 11 can be determined according to the current outdoor coil temperature and the current outdoor ambient temperature, so as to facilitate the subsequent control of the outdoor fan 11 to operate according to the target operating gear. When the speed of the outdoor fan 11 can adaptively increase, decrease or remain unchanged according to the outdoor ambient temperature and the outdoor coil temperature, it helps to reduce the operating power consumption of the outdoor fan 11 and ensure the optimal energy efficiency ratio of the air conditioner 10 in the entire frequency band.

[0069] In one embodiment of the present invention, when determining the target operating gear of the outdoor fan 11 based on the temperature zone corresponding to the current outdoor ambient temperature, the current outdoor coil temperature and the current outdoor ambient temperature, the controller 71 is configured to: when the temperature zone corresponding to the current outdoor ambient temperature is the second temperature zone or the third temperature zone, determine the difference between the current outdoor coil temperature and the current outdoor ambient temperature, and obtain the current outdoor ambient temperature to determine the lower limit value of the outdoor heat exchange temperature difference, the upper limit value of the outdoor heat exchange temperature difference, the lower limit value of the outdoor heat exchanger dirty and blocked outdoor heat exchange temperature difference, and the upper limit value of the outdoor heat exchanger dirty and blocked outdoor heat exchange temperature difference; and, determine the target operating gear of the outdoor fan 11 based on the comparison result of the difference with the lower limit value of the outdoor heat exchange temperature difference, the upper limit value of the outdoor heat exchange temperature difference, the lower limit value of the outdoor heat exchanger dirty and blocked outdoor heat exchange temperature difference, and the upper limit value of the outdoor heat exchanger dirty and blocked outdoor heat exchange temperature difference.

[0070] In a specific embodiment, when the temperature zone corresponding to the current outdoor ambient temperature is the second temperature zone or the third temperature zone, the controller 71 first determines the difference between the current outdoor coil temperature and the current outdoor ambient temperature, and obtains the current outdoor ambient temperature to determine the lower limit value of the outdoor heat exchange temperature difference, the upper limit value of the outdoor heat exchange temperature difference, the lower limit value of the outdoor heat exchanger dirty and blocked outdoor heat exchange temperature difference, and the upper limit value of the outdoor heat exchanger dirty and blocked outdoor heat exchange temperature difference; then, based on the comparison result of the difference with the lower limit value of the outdoor heat exchange temperature difference, the upper limit value of the outdoor heat exchange temperature difference, the lower limit value of the outdoor heat exchanger dirty and blocked outdoor heat exchange temperature difference, and the upper limit value of the outdoor heat exchanger dirty and blocked outdoor heat exchange temperature difference, the target operating gear of the outdoor fan 11 is determined. Specifically, the relationship between the lower limit value of the outdoor heat exchange temperature difference, the upper limit value of the outdoor heat exchange temperature difference, the lower limit value of the outdoor heat exchange temperature difference due to dirty and blocked outdoor heat exchanger, and the upper limit value of the outdoor heat exchange temperature difference due to dirty and blocked outdoor heat exchanger and the outdoor ambient temperature is pre-calibrated; and at the same outdoor ambient temperature, the lower limit value of the outdoor heat exchange temperature difference is less than the upper limit value of the outdoor heat exchange temperature difference, less than the lower limit value of the outdoor heat exchange temperature difference due to dirty and blocked outdoor heat exchanger, and less than the upper limit value of the outdoor heat exchange temperature difference due to dirty and blocked outdoor heat exchanger.

[0071] Specifically, according to the air conditioner 10 provided in the embodiment of the present invention, the second temperature zone or the third temperature zone represents a non-bad working condition, so a heat exchange return difference band and a dirty blockage return difference band are set, and the target operating gear of the outdoor fan 11 is determined according to the relationship between the heat exchange temperature difference and the heat exchange return difference band and the dirty blockage return difference band: when the temperature zone corresponding to the current outdoor ambient temperature is the second temperature zone or the third temperature zone, the controller 71 first determines the difference between the current outdoor coil temperature and the current outdoor ambient temperature, and obtains the current outdoor ambient temperature to determine the lower limit value of the outdoor heat exchange temperature difference, the upper limit value of the outdoor heat exchange temperature difference, the lower limit value of the outdoor heat exchanger dirty blockage outdoor heat exchange temperature difference and the upper limit value of the outdoor heat exchanger dirty blockage outdoor heat exchange temperature difference; then, according to the difference and the outdoor heat exchanger The target operating gear of the outdoor fan 11 is determined by comparing the lower limit of the heat temperature difference, the upper limit of the outdoor heat exchange temperature difference, the lower limit of the outdoor heat exchange temperature difference due to outdoor heat exchanger blockage and the upper limit of the outdoor heat exchange temperature difference due to outdoor heat exchanger blockage; in this way, under the non-severe working conditions represented by the second temperature zone or the third temperature zone, the target operating gear of the outdoor fan 11 can be determined according to the relationship between the heat exchange temperature difference and the heat exchange return difference band and the dirty return difference band, so as to facilitate the subsequent control of the outdoor fan 11 to operate according to the target operating gear. The speed of the outdoor fan 11 can adaptively increase, decrease or remain unchanged according to the outdoor ambient temperature and the outdoor coil temperature, which helps to reduce the operating power consumption of the outdoor fan 11 and ensure the optimal energy efficiency ratio of the air conditioner 10 in the entire frequency band.

[0072] In one embodiment of the present invention, when determining the target operating gear of the outdoor fan 11 based on the comparison result of the difference value with the lower limit value of the outdoor heat exchange temperature difference, the upper limit value of the outdoor heat exchange temperature difference, the lower limit value of the outdoor heat exchanger dirty and blocked outdoor heat exchange temperature difference, and the upper limit value of the outdoor heat exchanger dirty and blocked outdoor heat exchange temperature difference, the controller 71 is configured as follows: when the difference value is greater than the lower limit value of the outdoor heat exchange temperature difference and less than the upper limit value of the outdoor heat exchanger dirty and blocked outdoor heat exchange temperature difference, determining that the target operating gear of the outdoor fan 11 is the preset highest gear in the current temperature zone; and when the difference value of the current detection period is less than or equal to the lower limit value of the outdoor heat exchange temperature difference, determining that the target operating gear of the outdoor fan 11 is gradually decreased by one gear. gear; or, when the difference of the current detection cycle is greater than the lower limit of the outdoor heat exchange temperature difference and less than the upper limit of the outdoor heat exchange temperature difference, it is determined that the target operating gear of the outdoor fan 11 remains unchanged; or, when the difference of the current detection cycle is greater than the upper limit of the outdoor heat exchange temperature difference due to the outdoor heat exchanger being dirty and blocked, it is determined that the target operating gear of the outdoor fan 11 is increased by one gear, and when the difference of the next detection cycle is less than the lower limit of the outdoor heat exchange temperature difference due to the outdoor heat exchanger being dirty and blocked, it is determined that the target operating gear of the outdoor fan 11 is gradiently decreased by one gear, or when the difference of the next detection cycle is greater than the lower limit of the outdoor heat exchange temperature difference and less than the upper limit of the outdoor heat exchange temperature difference, it is determined that the target operating gear of the outdoor fan 11 remains unchanged.

[0073] In a specific embodiment, when the temperature zone corresponding to the current outdoor ambient temperature is the second temperature zone or the third temperature zone, and the difference between the outdoor coil temperature and the current outdoor ambient temperature is greater than the lower limit of the outdoor heat exchange temperature difference and less than the upper limit of the outdoor heat exchange temperature difference due to outdoor heat exchanger obstruction, the controller 71 determines the target operating gear of the outdoor fan 11 to be the preset maximum gear within the current temperature zone. Specifically, the preset maximum gear within the current temperature zone is pre-calibrated.

[0074] In a specific embodiment, the temperature zone corresponding to the current outdoor ambient temperature is the second temperature zone or the third temperature zone, and when the difference between the outdoor coil temperature and the current outdoor ambient temperature is less than or equal to the lower limit of the outdoor heat exchange temperature difference, the controller 71 determines that the target operating gear of the outdoor fan 11 is gradually reduced by one gear.

[0075] In a specific embodiment, when the temperature zone corresponding to the current outdoor ambient temperature is the second temperature zone or the third temperature zone, and the difference between the outdoor coil temperature of the current detection period and the current outdoor ambient temperature is greater than the lower limit value of the outdoor heat exchange temperature difference and less than the upper limit value of the outdoor heat exchange temperature difference, the controller 71 determines that the target operating gear of the outdoor fan 11 remains unchanged.

[0076] In a specific embodiment, when the temperature zone corresponding to the current outdoor ambient temperature is the second temperature zone or the third temperature zone, and the difference between the outdoor coil temperature in the current detection period and the current outdoor ambient temperature is greater than the upper limit value of the outdoor heat exchange temperature difference due to the outdoor heat exchanger being dirty and blocked, the controller 71 determines that the target operating gear of the outdoor fan 11 is increased by one gear, and when the difference in the next detection period is less than the lower limit value of the outdoor heat exchange temperature difference due to the outdoor heat exchanger being dirty and blocked, the controller 71 determines that the target operating gear of the outdoor fan 11 is gradually decreased by one gear, or when the difference in the next detection period is greater than the lower limit value of the outdoor heat exchange temperature difference and less than the upper limit value of the outdoor heat exchange temperature difference, the controller 71 determines that the target operating gear of the outdoor fan 11 remains unchanged.

[0077] Specifically, according to the air conditioner 10 provided in the embodiment of the present invention, the second temperature zone or the third temperature zone represents a non-bad working condition, so a heat exchange hysteresis band and a dirty blockage hysteresis band are set, and the target operating gear of the outdoor fan 11 is determined according to the relationship between the heat exchange temperature difference and the heat exchange hysteresis band and the dirty blockage hysteresis band: when the difference is greater than the lower limit value of the outdoor heat exchange temperature difference and less than the upper limit value of the outdoor heat exchange temperature difference when the outdoor heat exchanger is dirty and blocked, the controller 71 determines that the target operating gear of the outdoor fan 11 is the preset highest gear in the current temperature zone; and when the difference of the current detection cycle is less than or equal to the lower limit value of the outdoor heat exchange temperature difference, the controller 71 determines that the target operating gear of the outdoor fan 11 is gradiently reduced by one gear; or, when the difference of the current detection cycle is greater than the lower limit value of the outdoor heat exchange temperature difference and less than the upper limit value of the outdoor heat exchange temperature difference, the controller 71 determines that the target operating gear of the outdoor fan 11 remains unchanged; or, when the difference of the current detection cycle is greater than the upper limit value of the outdoor heat exchange temperature difference when the outdoor heat exchanger is dirty and blocked When the temperature reaches the upper limit, the controller 71 determines that the target operating gear of the outdoor fan 11 is increased by one gear, and when the difference in the next detection cycle is less than the lower limit of the outdoor heat exchange temperature difference due to the outdoor heat exchanger being dirty and blocked, the controller 71 determines that the target operating gear of the outdoor fan 11 is gradually decreased by one gear, or when the difference in the next detection cycle is greater than the lower limit of the outdoor heat exchange temperature difference and less than the upper limit of the outdoor heat exchange temperature difference, the controller 71 determines that the target operating gear of the outdoor fan 11 remains unchanged; in this way, under the non-severe working conditions represented by the second temperature zone or the third temperature zone, the target operating gear of the outdoor fan 11 can be determined according to the relationship between the heat exchange temperature difference, the heat exchange return difference band and the dirty and blocked return difference band, so that the outdoor fan 11 can be subsequently controlled to operate according to the target operating gear. When the speed of the outdoor fan 11 can be adaptively increased, decreased or kept unchanged according to the outdoor ambient temperature and the outdoor coil temperature, it helps to reduce the operating power consumption of the outdoor fan 11 and ensure the optimal energy efficiency ratio of the air conditioner 10 in the entire frequency band.

[0078] In one embodiment of the present invention, when determining that the target operating gear of the outdoor fan 11 decreases gradually, the controller 71 is configured to: control the outdoor fan 11 to alternately perform a first action and a second action in sequence, wherein the first action includes: the target operating gear decreases by one gear within a preset execution cycle, and the second action includes: the target operating gear remains unchanged within multiple preset execution cycles.

[0079] In a specific embodiment, when determining that the target operating gear of the outdoor fan 11 is to be gradually decreased, the controller 71 controls the outdoor fan 11 to alternately perform a first action and a second action. The first action is to decrease the target operating gear by one gear within a preset execution cycle, and the second action is to maintain the target operating gear unchanged for multiple preset execution cycles. Specifically, the preset execution cycle is set as needed, for example, 1 minute.

[0080] Specifically, according to the air conditioner 10 provided by an embodiment of the present invention, when determining that the target operating gear of the outdoor fan 11 is to be gradually decreased, the controller 71 controls the outdoor fan 11 to alternately perform the first action and the second action in sequence. The first action is that the target operating gear is reduced by one gear within a preset execution cycle, and the second action is that the target operating gear remains unchanged within multiple preset execution cycles; thereby, the downshifting speed is avoided to be too fast and the temperature changes to be too fast, thereby ensuring the stability of the operation of the air conditioner 10.

[0081] In one embodiment of the present invention, both the lower limit value of the outdoor heat exchange temperature difference and the lower limit value of the outdoor heat exchanger blockage outdoor heat exchange temperature difference are configured to be inversely proportional to the change trend of the current outdoor ambient temperature.

[0082] Specifically, according to the air conditioner 10 provided in an embodiment of the present invention, the lower limit value of the outdoor heat exchange temperature difference and the lower limit value of the outdoor heat exchange temperature difference due to dirtiness and blockage of the outdoor heat exchanger are configured to be inversely proportional to the changing trend of the current outdoor ambient temperature, that is, the lower boundary of the outdoor heat exchange temperature difference critical value and the lower boundary of the outdoor heat exchange temperature difference critical value under dirtiness and blockage are both increased as the outdoor temperature decreases; thereby, the gear change can be avoided from oscillating back and forth, thereby ensuring the stability of the operation of the air conditioner 10.

[0083] In one embodiment of the present invention, the difference between the upper limit value of the outdoor heat exchange temperature difference and the lower limit value of the outdoor heat exchange temperature difference, and the difference between the upper limit value of the outdoor heat exchange temperature difference due to dirty and clogged outdoor heat exchanger and the lower limit value of the outdoor heat exchange temperature difference due to dirty and clogged outdoor heat exchanger are both configured to be inversely proportional to the changing trend of the current outdoor ambient temperature.

[0084] Specifically, according to the air conditioner 10 provided by the embodiment of the present invention, the difference between the upper limit value of the outdoor heat exchange temperature difference and the lower limit value of the outdoor heat exchange temperature difference, as well as the difference between the upper limit value of the outdoor heat exchange temperature difference due to dirty and clogged outdoor heat exchanger and the lower limit value of the outdoor heat exchange temperature difference due to dirty and clogged outdoor heat exchanger are configured to be inversely proportional to the changing trend of the current outdoor ambient temperature, that is, the bandwidth of the heat exchange hysteresis band and the bandwidth of the dirty and clogged hysteresis band are determined to increase as the outdoor temperature decreases; thereby, the periodic oscillation phenomenon caused by gear changes can be avoided, thereby ensuring the stability of the operation of the air conditioner 10.

[0085] The air conditioner 10 of the above embodiment of the present invention is further described below with reference to a specific embodiment. In this specific embodiment, a method for controlling the air conditioner is provided. Figure 4 Schematic diagram of temperature zone division according to a specific embodiment of the present invention. Figure 4 As shown, in this specific embodiment, the outdoor temperature is divided into four temperature zones, namely low temperature zone, medium temperature zone, high temperature zone, and ultra-high temperature zone, and the hysteresis band of the temperature zone is set. Figure 1As shown. There are low-temperature zone (Tout < Tout1-3°C), medium-temperature zone (Tout1 ≤ Tout < Tout2-3°C), high-temperature zone (Tout2 ≤ Tout < Tout3-3°C), and ultra-high-temperature zone (Tout ≥ Tout3). To prevent the outdoor temperature from being at the junction of different temperature zones, and because the outdoor fan has upper and lower limits in different temperature zones, an outer ring temperature transition zone is set between adjacent temperature zones to prevent gear changes. This prevents the outdoor fan gear from changing under specific conditions, which could cause fluctuations in the entire cooling system. Transition zone 1 (Tout1-3°C ≤ Tout < Tout1) applies: if the outdoor temperature enters transition zone 1 from the low-temperature zone, transition zone 1 becomes the low-temperature zone; if the outdoor temperature enters transition zone 1 from the medium-low temperature zone, transition zone 1 becomes the medium-low temperature zone. Transition Zone 2 (Tout2-3°C ≤ Tout < Tout2): If the outdoor temperature is in the medium-low temperature range and enters Transition Zone 2, then Transition Zone 2 will belong to the medium-low temperature range; if the outdoor temperature is in the ultra-high temperature range and enters Transition Zone 2, then Transition Zone 2 will belong to the medium-high temperature range. Transition Zone 3 (Tout3-3°C ≤ Tout < Tout3): If the outdoor temperature is in the medium-high temperature range and enters Transition Zone 3, then Transition Zone 3 will belong to the medium-high temperature range; if the outdoor temperature is in the ultra-high temperature range and enters Transition Zone 3, then Transition Zone 3 will belong to the ultra-high temperature range.

[0086] Figure 5 FIG. 1 is a schematic diagram showing the relationship between the speed and gear position of an outdoor fan according to a specific embodiment of the present invention. Figure 5 As shown, in this specific embodiment, the outdoor axial flow fan has the possibility of resonance at some speeds of the fan system due to its structural characteristics. The speed cannot be automatically generated according to the rules. The speeds of the D1~Dx gears need to be set separately to avoid special fixed speeds. The speeds of D1, D2, ..., Dx gradually increase, such as Figure 5 ; Except for the D1 gear, the other gears above are just examples and do not mean that they must be designed according to this gear. For example, the maximum Dx gear can be D15 or D10, and the lower limit gear of each temperature zone can also be designed according to the actual product.

[0087] In this specific embodiment, when the air conditioner is in cooling operation, the outdoor ambient temperature Tout is detected and the air conditioner is operated for t1min. The initial speed is the preset value of each temperature zone, such as D6 in the low temperature zone, D10 in the medium temperature zone, D12 in the high temperature zone, and D13 in the ultra-high temperature zone. After t1min, the outdoor ambient temperature Tout is detected again and the temperature is adjusted. Figure 4 Determine a new initial gear and iterate based on it. The above gears are only examples and do not represent the actual gears.

[0088] Figure 6 FIG. 1 is a schematic diagram showing a principle for determining the outdoor fan gear position according to a specific embodiment of the present invention. Figure 6As shown, in this specific embodiment, in the ultra-high temperature zone, the outdoor fan gear is increased, decreased or maintained based on the absolute value of the condensing temperature Tc; in a new detection cycle, when it is detected that Tc ≥ Tc10 and Tout > Tout4, the outdoor fan speed is increased by 1 gear. After it rises to gear D14, the outdoor fan speed can only be reduced to gear D13 when Tc < Tc9 to avoid gear oscillation; similarly, in a new detection cycle, when it is detected that Tc ≥ Tc11 and Tout > Tout4, the outdoor fan speed is increased by 1 gear again. After it rises to gear D15, the outdoor fan speed can only be reduced to gear D14 when Tc < Tc10 to avoid gear oscillation; in order to ensure that the outdoor fan gear does not oscillate back and forth, in general, Tc11-Tc10 ≥ 2°C, Tc10-Tc9 ≥ 2°C; wherein, at gear D13, the measured value of the outdoor unit noise value should meet the upper limit value of the national standard (GB / T 7725, the outdoor ambient temperature for maximum cooling operation is 43°C, so Tout4>43°C). That is, D13 gear cannot be set arbitrarily, but the condensing temperatures Tc10 and Tc11 corresponding to D14 and D15 gears are very high and Tout is already greater than 43°C. At this time, the reliability of the entire machine is given priority (reducing exhaust pressure and reducing temperature rise during power heating). At this time, the measured noise level of the gear can generally exceed the upper limit of the national standard.

[0089] In this specific embodiment, the outdoor temperature Tout and the external disk temperature Tc are detected in the medium and high temperature zones, and ΔTout is calculated. The outdoor heat exchange temperature difference approximate value (also called the lower limit value) and its upper limit value (upper limit value = lower limit value + hysteresis band value) of Tout are also calculated, as well as the upper limit value of the outdoor heat exchange temperature difference due to outdoor heat exchanger blockage and its lower limit value (upper limit value - hysteresis band value). If ΔTout is greater than the approximate lower limit value and less than the approximate upper limit value due to outdoor heat exchanger blockage, the outdoor fan speed is set to the maximum gear for that temperature zone, such as D12 (this value is generally determined by the nominal noise value on the nameplate; if the speed is too high, there is a noise unacceptable problem).

[0090] In this specific embodiment, as the room temperature reaches the set temperature, the compressor frequency decreases and ΔTout also decreases accordingly. In a certain detection cycle, if ΔTout ≤ the lower limit value, the outdoor fan is forced to downshift by one gear, and the outdoor fan adopts a gradient downshift algorithm (downshift by one gear → maintain for n cycles → downshift by another gear, n ≥ 1). The lowest gear can be the lowest gear of the temperature zone. If ΔTout is between the lower limit value and the upper limit value, the gear remains unchanged at the gear of the previous cycle.

[0091] In this specific embodiment, in a certain detection cycle, if ΔTout is greater than the upper limit value of the outdoor heat exchanger being dirty and blocked, it is determined that the outdoor heat exchanger is dirty and blocked, and the outdoor fan gear is increased by one gear, such as D13 gear; in a new cycle, if ΔTout is less than the lower limit value of the outdoor heat exchanger being dirty and blocked, the outdoor fan gear is decreased by one gear to D12 gear; if ΔTout is between the lower limit value and the upper limit value, the gear position remains unchanged from the previous cycle.

[0092] The following is an example of another specific embodiment to illustrate the control method of the air conditioner according to the above specific embodiment of the present invention: In this specific embodiment, for a certain air conditioner model, the relevant parameters are set as follows: t1=2min, detection cycle t2=2min, T1=2℃, T2=3℃, T3=4℃, T4=6℃, T5=9℃, T6=14℃, T7=29℃, T8=37℃, T9=15℃, T10=18℃, T11=25℃, T12=30℃, Tout1=20℃, Tout2=30℃, Tout3=40℃, Tout4=45℃, Tc9=45℃, Tc10=50℃, Tc11=55℃, D1=170rpm, D2=190rpm, D3=22 0rpm, D4=250rpm, D5=290rpm, D6=340rpm, D7=400rpm, D8=470rpm, D9=550rpm, D10=640rpm, D11=730rpm, D12=820rpm, D13=910rpm, D14=980rpm, D15=1040rpm, △R=15rpm, n=2, x=15. The lower limit of the medium temperature range is D3, and the upper limit is D10. The lower limit of the high temperature range is D6, and the upper limit is D12. The lowest level of the ultra-high temperature range is D13, and the highest level is D15. The detection accuracy of the outdoor temperature and condensing temperature is 0.5°C.

[0093] Example 1: During cooling operation (with the outdoor unit in the grille prison position), the first detected outdoor temperature is 38°C, placing it in the high temperature range. The outdoor fan is initially set to D12. Two minutes later, the outer ring temperature is re-detected at 42°C, placing it in the ultra-high temperature range. At this point, the condensing temperature is 48°C, but Tout < Tout4 = 45°C. Therefore, the outdoor fan is set to D13. In a new cycle (each cycle lasting 2 minutes), the outdoor temperature reaches 50°C > Tout4 = 45°C, and the condensing temperature reaches 57°C > Tc11 = 55°C. The outdoor fan is then directly raised to D15. After several cycles, as the room temperature approaches the setpoint, the fan frequency is reduced, and the condensing temperature begins to decrease. The outer ring temperature is 48°C, and the condensing temperature reaches 51°C > Tc10 = 50°C. The outdoor fan remains at D15.

[0094] Example 2: During cooling operation, the first detected outer ring temperature is 36°C, and the initial gear of the outdoor fan is D12. 2 minutes later, the outer ring temperature is re-detected at 35°C, which is still in the medium and high temperature range. At this time, the condensing temperature is 47°C. The outdoor heat exchange temperature difference △Tout is calculated to be 47-35=12°C>△Tout1=3°C, and the outdoor fan gear is D12. After several cycles, the outdoor temperature is detected to be 35°C, and the condensing temperature is 38°C. The lower limit threshold of the outdoor heat exchange temperature difference is calculated to be 3°C, and the upper limit is calculated to be 47-35=12°C. The value is 4.5°C. The actual outdoor heat exchange temperature difference is calculated to be 38-35, which is 3°C. The outdoor fan gear is lowered by one gear to D11. After waiting for two cycles (step down, n=2), the outdoor temperature is detected to be 35°C and the condensing temperature is 38.5°C. The lower threshold value of the outdoor heat exchange temperature difference is calculated to be 3°C, and the upper threshold value is calculated to be 4.5°C. The actual outdoor heat exchange temperature difference is calculated to be 38.5-35, which is 3.5°C. This is between the lower and upper limits, and the gear position remains unchanged at D11. After several cycles, the outdoor temperature is detected to be 34.5°C and the condensing temperature is 37°C. The lower threshold value of the outdoor heat exchange temperature difference is calculated to be 3°C, and the upper threshold value is calculated to be 4.5°C. The actual outdoor heat exchange temperature difference is calculated to be 2.5°C, and the outdoor fan gear is lowered by one gear to D10. After waiting for two cycles, the relevant parameters are tested again. The above process is repeated. But the lowest final gear can be D6.

[0095] From the above two specific embodiments, it can be seen that the control method for the air conditioner, by establishing adaptive coordinated control of the condensing temperature and the outdoor fan speed, ensures that when the condensing temperature rises due to the outdoor heat exchanger being dirty or blocked, or the outdoor unit grille being out of position, the outdoor fan speed adaptively increases, which helps to lower the condensing temperature, thereby increasing the cooling capacity and reducing the temperature rise of the power components; and in the high temperature zone, between the highest and lowest frequencies, the outdoor fan speed adaptively increases, decreases, or remains unchanged according to the condensing temperature. For example, when the compressor operates at a low frequency and does not require a very high circulating air volume, the outdoor unit fan speed adaptively decreases according to the lower limit threshold of the outdoor heat exchange temperature difference at the current outdoor temperature, thereby reducing the partial operating power consumption of the outdoor fan (also known as reducing parasitic power consumption), thereby ensuring the optimal energy efficiency ratio across the entire frequency band. In summary, the air conditioner 10 provided according to the embodiment of the present invention includes a refrigerant circulation loop, an outdoor fan 11, an outdoor temperature sensor 12, an outdoor coil temperature sensor 13 and a controller 71. The outdoor fan 11 is used to discharge the heat released by the refrigerant in the condenser in the cooling mode, the outdoor temperature sensor 12 is used to detect the outdoor ambient temperature, and the outdoor coil temperature sensor 13 is used to detect the outdoor coil temperature. When the air conditioner 10 is in cooling operation, the controller 71 first determines the temperature zone corresponding to the current outdoor ambient temperature, and determines the initial speed of the outdoor fan 11 in the current temperature zone, and controls the outdoor fan 11 to run at the initial speed; after the outdoor fan 11 runs at the initial speed for the first preset time, the outdoor fan 11 is periodically adjusted in speed according to the preset cycle. The section includes: redetermining the temperature zone corresponding to the current outdoor ambient temperature, and redetermining the initial speed of the outdoor fan 11 in the current temperature zone, and controlling the outdoor fan 11 to operate at the initial speed, and determining the target operating gear of the outdoor fan 11 according to the temperature zone corresponding to the current outdoor ambient temperature, the current outdoor coil temperature and the current outdoor ambient temperature, and controlling the outdoor fan 11 to operate according to the target operating gear; thereby establishing adaptive coordinated control of the speed of the outdoor fan 11, the outdoor ambient temperature and the outdoor coil temperature, so that the speed of the outdoor fan 11 can adaptively increase, decrease or remain unchanged according to the outdoor ambient temperature and the outdoor coil temperature, thereby helping to reduce the operating power consumption of the outdoor fan 11 and ensuring the optimal energy efficiency ratio of the air conditioner 10 in the entire frequency band.

[0096] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "example," "specific example," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0097] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. An air conditioner, characterized in that: include: A refrigerant circulation loop circulates the refrigerant in a loop consisting of a compressor, a four-way valve, a condenser, an expansion valve, and an evaporator, wherein one of the condenser and the evaporator is an outdoor heat exchanger and the other is an indoor heat exchanger; An outdoor fan, used to discharge heat released by the refrigerant in the condenser in cooling mode; Outdoor temperature sensor, used to detect outdoor ambient temperature; Outdoor coil temperature sensor, used to detect outdoor coil temperature; A controller configured to: When the air conditioner is in cooling operation, determining a temperature zone corresponding to the current outdoor ambient temperature, determining an initial speed of the outdoor fan in the current temperature zone, and controlling the outdoor fan to operate at the initial speed; After the outdoor fan runs at the initial speed for a first preset time, the outdoor fan is periodically adjusted in speed according to a preset cycle, including: re-determining the temperature zone corresponding to the current outdoor ambient temperature, and re-determining the initial speed of the outdoor fan in the current temperature zone, and controlling the outdoor fan to run at the initial speed, and determining the target operating gear of the outdoor fan according to the temperature zone corresponding to the current outdoor ambient temperature, the current outdoor coil temperature and the current outdoor ambient temperature, and controlling the outdoor fan to run according to the target operating gear.

2. The air conditioner according to claim 1, characterized in that When determining the temperature zone corresponding to the current outdoor ambient temperature, the controller is configured to: When the current outdoor ambient temperature is within the first temperature range, the corresponding temperature zone is determined to be the first temperature zone; or When the current outdoor ambient temperature is within the second temperature range, determining the corresponding temperature zone as the second temperature zone; or, When the current outdoor ambient temperature is within the third temperature range, the corresponding temperature zone is determined to be the third temperature zone; or When the current outdoor ambient temperature is between the fourth temperature range, the corresponding temperature zone is determined to be the fourth temperature zone; wherein, The upper temperature limit of the first temperature interval is less than or equal to the lower temperature limit of the second temperature interval, the upper temperature limit of the second temperature interval is less than or equal to the lower temperature limit of the third temperature interval, and the upper temperature limit of the third temperature interval is less than or equal to the lower temperature limit of the fourth temperature interval.

3. The air conditioner according to claim 2, characterized in that A first transition temperature interval is provided between the first temperature interval and the second temperature interval, a second transition temperature interval is provided between the second temperature interval and the third temperature interval, and a third transition temperature interval is provided between the third temperature interval and the fourth temperature interval; When determining the temperature zone corresponding to the current outdoor ambient temperature, the controller is further configured to: When the current outdoor ambient temperature changes from the first temperature range to the first transition temperature range, the corresponding temperature zone is determined to be the first temperature zone; or, When the current outdoor ambient temperature changes from the second temperature range to the first transition temperature range, the corresponding temperature zone is determined to be the second temperature zone; or, When the current outdoor ambient temperature changes from the second temperature range to the second transition temperature range, the corresponding temperature zone is determined to be the second temperature zone; or, When the current outdoor ambient temperature changes from the third temperature range to the second transition temperature range, determining that the corresponding temperature zone is the third temperature zone; or, When the current outdoor ambient temperature changes from the third temperature interval to the third transition temperature interval, determining the corresponding temperature zone as the third temperature zone; or, When the current outdoor ambient temperature changes from the fourth temperature interval to the third transition temperature interval, the corresponding temperature zone is determined to be the fourth temperature zone.

4. The air conditioner according to claim 2 or 3, characterized in that: When determining the initial speed of the outdoor fan in the current temperature zone, the controller is configured to: Determining a first preset initial speed as the initial speed of the outdoor fan in the first temperature zone; or, Determining a second preset initial speed as the initial speed of the outdoor fan in the second temperature zone; or, Determining a third preset initial speed as the initial speed of the outdoor fan in the third temperature zone; or, A fourth preset initial speed is determined to be the initial speed of the outdoor fan in the fourth temperature zone.

5. The air conditioner according to claim 2 or 3, characterized in that: When determining the target operating gear of the outdoor fan according to the temperature zone corresponding to the current outdoor ambient temperature, the current outdoor coil temperature, and the current outdoor ambient temperature, the controller is configured to: When the temperature zone corresponding to the current outdoor ambient temperature is the fourth temperature zone, and within a preset detection period, the current outdoor coil temperature is greater than or equal to a first preset temperature value, and the current outdoor ambient temperature is greater than a second preset temperature value, determining that the target operating gear of the outdoor fan is increased by a first preset number of gears; or, When the temperature zone corresponding to the current outdoor ambient temperature is the fourth temperature zone and the current outdoor coil temperature is less than a third preset temperature value within a preset detection period, determining that the target operating gear of the outdoor fan is lowered by a second preset number of gears; or, The temperature zone corresponding to the current outdoor ambient temperature is the fourth temperature zone, and within the preset detection period, when the current outdoor coil temperature is less than the first preset temperature value, or the current outdoor ambient temperature is less than or equal to the second preset temperature value, or the current outdoor ambient temperature is greater than or equal to the third preset temperature value, it is determined that the target operating gear of the outdoor fan remains unchanged.

6. The air conditioner according to claim 2 or 3, characterized in that: When determining the target operating gear of the outdoor fan according to the temperature zone corresponding to the current outdoor ambient temperature, the current outdoor coil temperature, and the current outdoor ambient temperature, the controller is configured to: When the temperature zone corresponding to the current outdoor ambient temperature is the second temperature zone or the third temperature zone, determining the difference between the current outdoor coil temperature and the current outdoor ambient temperature, and obtaining the current outdoor ambient temperature to determine the lower limit value of the outdoor heat exchange temperature difference, the upper limit value of the outdoor heat exchange temperature difference, the lower limit value of the outdoor heat exchanger dirty and blocked outdoor heat exchanger temperature difference, and the upper limit value of the outdoor heat exchanger temperature difference due to dirty and blocked outdoor heat exchanger; and The target operating gear of the outdoor fan is determined based on a comparison result of the difference with the lower limit value of the outdoor heat exchange temperature difference, the upper limit value of the outdoor heat exchange temperature difference, the lower limit value of the outdoor heat exchanger dirty and blocked outdoor heat exchanger temperature difference, and the upper limit value of the outdoor heat exchanger dirty and blocked outdoor heat exchanger temperature difference.

7. The air conditioner according to claim 6, characterized in that When determining the target operating gear of the outdoor fan based on a comparison result of the difference with the outdoor heat exchange temperature difference lower limit, the outdoor heat exchange temperature difference upper limit, the outdoor heat exchanger dirty and blocked outdoor heat exchanger lower limit, and the outdoor heat exchange temperature difference upper limit due to dirty and blocked outdoor heat exchanger, the controller is configured to: When the difference is greater than the lower limit of the outdoor heat exchange temperature difference and less than the upper limit of the outdoor heat exchange temperature difference when the outdoor heat exchanger is dirty and blocked, determining the target operating gear of the outdoor fan to be the preset highest gear in the current temperature zone; and When the difference value of the current detection cycle is less than or equal to the lower limit value of the outdoor heat exchange temperature difference, determining that the target operating gear of the outdoor fan is gradually reduced by one gear; or, When the difference value in the current detection cycle is greater than the lower limit value of the outdoor heat exchange temperature difference and less than the upper limit value of the outdoor heat exchange temperature difference, determining that the target operating gear of the outdoor fan remains unchanged; or, When the difference in the current detection cycle is greater than the upper limit of the outdoor heat exchange temperature difference due to the outdoor heat exchanger being dirty and clogged, the target operating gear of the outdoor fan is determined to be increased by one gear, and when the difference in the next detection cycle is less than the lower limit of the outdoor heat exchange temperature difference due to the outdoor heat exchanger being dirty and clogged, the target operating gear of the outdoor fan is determined to be gradually decreased by one gear, or when the difference in the next detection cycle is greater than the lower limit of the outdoor heat exchange temperature difference and less than the upper limit of the outdoor heat exchange temperature difference, the target operating gear of the outdoor fan is determined to remain unchanged.

8. The air conditioner according to claim 7, characterized in that When determining that the target operating gear of the outdoor fan is gradually decreased, the controller is configured to: The outdoor fan is controlled to alternately perform a first action and a second action in sequence, wherein the first action includes: the target operating gear is reduced by one gear within a preset execution cycle, and the second action includes: the target operating gear remains unchanged within multiple preset execution cycles.

9. The air conditioner according to claim 6, characterized in that The lower limit value of the outdoor heat exchange temperature difference and the lower limit value of the outdoor heat exchanger dirty and blocked outdoor heat exchange temperature difference are both configured to be inversely proportional to the change trend of the current outdoor ambient temperature.

10. The air conditioner according to claim 6, characterized in that The difference between the upper limit value of the outdoor heat exchange temperature difference and the lower limit value of the outdoor heat exchange temperature difference, and the difference between the upper limit value of the outdoor heat exchange temperature difference when the outdoor heat exchanger is dirty and blocked and the lower limit value of the outdoor heat exchange temperature difference when the outdoor heat exchanger is dirty and blocked are both configured to be inversely proportional to the change trend of the current outdoor ambient temperature.

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