Air conditioner and control method thereof

Abstract

The invention discloses an air conditioner and a control method thereof.The air conditioner comprises a refrigerant circulation loop, a throttling component, an indoor fan, an outdoor fan, an outdoor temperature sensor, an exhaust temperature sensor and a controller, and the controller is configured to periodically detect operation parameters of the air conditioner when it is determined that the outdoor environment temperature is higher than the preset temperature, the operating parameters comprise the rotating speed of the compressor, the condensing pressure of the condenser, the evaporating pressure of the evaporator and the exhaust temperature of the compressor; determining bearing parameters used for representing the bearing lubrication state of the compressor according to the operation parameters; and the operation state of the air conditioner is controlled according to the bearing parameters, so that the compressor is ensured to operate in a good lubrication state, the reliability of the compressor is improved, and the refrigeration performance of the air conditioner is improved.

Description

Technical Field

[0001] This invention relates to the field of air conditioner technology, and in particular to an air conditioner and its control method. Background Technology

[0002] When the outdoor ambient temperature is high, the air conditioner is in operation, especially in cooling mode. The condenser and evaporator of the air conditioner will be under great pressure, resulting in very high condensing and evaporating pressures, which can easily exceed the reliability operating range required by the compressor specifications.

[0003] In existing technologies, the operating range of a compressor is typically limited by a relatively simple and direct method: setting a pressure threshold. Once the condensing and evaporating pressures exceed this threshold, the compressor speed is limited to reduce the condensing and evaporating pressures. While this protection method can protect the compressor's reliability to some extent, it has significant limitations. It cannot accurately control the lubrication of the compressor bearings, nor can it fully utilize the air conditioner's cooling capacity. In some cases, this simple protection method may even reduce the compressor's reliability. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the object of the present invention is to provide an air conditioner and a control method thereof.

[0005] This invention discloses an air conditioner comprising: a refrigerant circulation loop, wherein the refrigerant circulates in a loop consisting of a compressor, 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; a throttling component disposed between the condenser and the evaporator, the throttling component being used to limit or regulate the flow resistance of the refrigerant passing through it, thereby limiting or regulating the flow velocity of the refrigerant passing through it; an indoor fan, used to drive indoor air through the indoor heat exchanger by rotation, so that the refrigerant exchanges heat with the indoor air; and an outdoor fan, used to drive outdoor air through the outdoor heat exchanger by rotation. The system includes: a compressor for heat exchange between the refrigerant and outdoor air; an outdoor temperature sensor for detecting the outdoor ambient temperature; an exhaust temperature sensor for detecting the exhaust temperature of the compressor; and a controller configured to: periodically detect the operating parameters of the air conditioner when the outdoor ambient temperature is higher than a preset temperature, wherein the operating parameters include: the compressor speed, the condensing pressure of the condenser, the evaporating pressure of the evaporator, and the exhaust temperature of the compressor; determine bearing parameters characterizing the bearing lubrication state of the compressor based on the operating parameters; and control the operating state of the air conditioner based on the bearing parameters.

[0006] In addition, the air conditioner according to embodiments of the present invention may also have the following additional technical features:

[0007] Furthermore, when controlling the operating state of the air conditioner according to the bearing parameters, the controller is configured to: when the bearing parameters meet a first preset condition, control the air conditioner to maintain its current operating state and return to the step of periodically detecting the operating parameters of the air conditioner; when the bearing parameters do not meet the first preset condition, further determine whether the bearing parameters meet a second preset condition; if the bearing parameters meet the second preset condition, obtain the rotational speed of the outdoor fan and control the operating state of the outdoor fan according to the rotational speed of the outdoor fan; otherwise, control the air conditioner to stop and issue a shutdown alarm signal.

[0008] Furthermore, the air conditioner also includes: an air guide assembly disposed at the air outlet of the air conditioner, the air guide assembly adjusting the air outlet angle by swinging or stopping its swing; when controlling the operating state of the outdoor fan according to the speed of the outdoor fan, the controller is configured to: determine whether the speed of the outdoor fan reaches or exceeds a first speed threshold; if not, increase the speed of the outdoor fan and control the outdoor fan to operate at the increased outdoor fan speed; if yes, keep the speed of the outdoor fan unchanged, obtain the air outlet angle, and control the operating state of the air guide assembly according to the air outlet angle.

[0009] Furthermore, when controlling the operating state of the air guide component according to the air outlet angle, the controller is configured to: determine whether the air outlet angle reaches or exceeds the target angle threshold; if not, control the air guide component to swing in the direction of increasing the air outlet angle to increase the air outlet angle; if so, keep the position of the air guide component unchanged, obtain the rotation speed of the indoor fan, and control the operating state of the indoor fan according to the rotation speed of the indoor fan.

[0010] Furthermore, when controlling the operating state of the indoor fan according to the rotational speed of the indoor fan, the controller is configured to: determine whether the rotational speed of the indoor fan reaches or exceeds a second rotational speed threshold; if not, increase the rotational speed of the indoor fan and control the indoor fan to operate at the increased indoor fan speed; if yes, keep the rotational speed of the indoor fan unchanged, and obtain the rotational speed of the compressor or the condensing pressure, and control the operating state of the compressor according to the rotational speed of the compressor or the condensing pressure.

[0011] Furthermore, when controlling the operating state of the compressor based on the compressor speed or the condensing pressure, the controller is configured to: determine whether the compressor speed reaches or exceeds a third speed threshold, or whether the condensing pressure reaches or exceeds a preset pressure threshold; if not, increase the compressor speed and control the compressor to operate at the increased compressor speed; if yes, keep the compressor speed unchanged.

[0012] Furthermore, the bearing parameters include the oil film thickness of the compressor bearing.

[0013] Further, the first preset condition includes: the oil film thickness reaches or exceeds a first preset thickness threshold; the second preset condition includes: the oil film thickness reaches or exceeds a second preset thickness threshold, but does not reach the first preset thickness threshold, wherein the first preset thickness threshold is greater than the second preset thickness threshold.

[0014] Furthermore, when determining the bearing parameters used to characterize the bearing lubrication state of the compressor based on the operating parameters, the controller is configured to: determine the bearing load based on the condensing pressure and the evaporating pressure; determine the bearing lubricating oil viscosity based on the exhaust temperature and the condensing pressure; and determine the oil film thickness based on the bearing load, the bearing lubricating oil viscosity, and the compressor speed.

[0015] Furthermore, when determining the oil film thickness based on the bearing load, the bearing lubricating oil viscosity, and the compressor speed, the controller is configured to: based on the bearing load, the bearing lubricating oil viscosity, and the compressor speed, obtain the oil film thickness corresponding to the bearing load, the bearing lubricating oil viscosity, and the compressor speed by querying a pre-calibrated mapping table of the correspondence between bearing load, bearing lubricating oil viscosity, compressor speed, and oil film thickness. The mapping table includes multiple sets of correspondences between bearing load, bearing lubricating oil viscosity, compressor speed, and oil film thickness, and these multiple sets of correspondences include the correspondence between the bearing load, the bearing lubricating oil viscosity, the compressor speed, and the oil film thickness.

[0016] Furthermore, when determining the oil film thickness based on the bearing load, the bearing lubricating oil viscosity, and the compressor speed, the controller is configured to: obtain the oil film thickness corresponding to the bearing load, the bearing lubricating oil viscosity, and the compressor speed by fitting an equation based on a pre-calibrated fitting model of the relationship between the bearing load, the bearing lubricating oil viscosity, the compressor speed, and the oil film thickness.

[0017] Furthermore, the bearing parameters include: the bearing temperature rise of the compressor.

[0018] Further, the first preset condition includes: the bearing temperature rise does not reach the first preset temperature threshold; the second preset condition includes: the bearing temperature rise reaches or exceeds the first preset temperature threshold, but does not reach the second preset temperature threshold, wherein the first preset temperature threshold is less than the second preset temperature threshold.

[0019] Furthermore, when determining the bearing parameters used to characterize the bearing lubrication state of the compressor based on the operating parameters, the controller is configured to: determine the bearing load based on the condensing pressure and the evaporating pressure; determine the bearing lubricating oil viscosity based on the exhaust temperature and the condensing pressure; and determine the bearing temperature rise based on the bearing load, the bearing lubricating oil viscosity, and the compressor speed.

[0020] Furthermore, when determining the bearing temperature rise based on the bearing load, the bearing lubricating oil viscosity, and the compressor speed, the controller is configured to: based on the bearing load, the bearing lubricating oil viscosity, and the compressor speed, obtain the bearing temperature rise corresponding to the bearing load, the bearing lubricating oil viscosity, and the compressor speed by querying a pre-calibrated mapping table of the correspondence between bearing load, bearing lubricating oil viscosity, compressor speed, and bearing temperature rise. The mapping table includes multiple sets of correspondences between bearing load, bearing lubricating oil viscosity, compressor speed, and bearing temperature rise, and these multiple sets of correspondences include the correspondence between the bearing load, the bearing lubricating oil viscosity, the compressor speed, and the bearing temperature rise.

[0021] Furthermore, when determining the bearing temperature rise based on the bearing load, the bearing lubricating oil viscosity, and the compressor speed, the controller is configured to: obtain the bearing temperature rise corresponding to the bearing load, the bearing lubricating oil viscosity, and the compressor speed by fitting an equation based on a pre-calibrated fitting model of the relationship between the bearing load, the bearing lubricating oil viscosity, the compressor speed, and the bearing temperature rise.

[0022] According to an embodiment of the present invention, the air conditioner acquires the outdoor ambient temperature through an outdoor temperature sensor, compares the acquired outdoor ambient temperature with a preset temperature, and determines that when the outdoor ambient temperature is higher than the preset temperature, the controller periodically detects the operating parameters of the air conditioner, namely, periodically detects the compressor speed, the condensing pressure of the condenser, the evaporating pressure of the evaporator, and the exhaust temperature of the compressor. Based on the acquired operating parameters, bearing parameters can be determined to characterize the bearing lubrication state of the compressor. Therefore, the operating state of the air conditioner can be controlled according to the determined bearing parameters to ensure that the compressor operates under good lubrication conditions, improve the reliability of the compressor, and thus improve the cooling performance of the air conditioner.

[0023] To address the aforementioned problems, this invention also proposes a control method for an air conditioner, used in any of the above embodiments. The method includes the following steps: when the outdoor ambient temperature is higher than a preset temperature, periodically detecting the operating parameters of the air conditioner, wherein the operating parameters include: the compressor speed, the condensing pressure of the condenser, the evaporating pressure of the evaporator, and the exhaust temperature of the compressor; determining bearing parameters characterizing the bearing lubrication state of the compressor based on the operating parameters; and controlling the operating state of the air conditioner based on the bearing parameters.

[0024] According to the air conditioner control method of the present invention, by comparing the outdoor ambient temperature and the preset temperature, when the outdoor ambient temperature is higher than the preset temperature, the operating parameters of the air conditioner are periodically detected, namely, the compressor speed, the condensing pressure of the condenser, the evaporating pressure of the evaporator, and the discharge temperature of the compressor are periodically detected. Based on the obtained operating parameters, bearing parameters can be determined to characterize the bearing lubrication state of the compressor. Thus, the operating state of the air conditioner can be controlled according to the determined bearing parameters to ensure that the compressor operates under good lubrication conditions, improve the reliability of the compressor, and thereby improve the cooling performance of the air conditioner.

[0025] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0026] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0027] Figure 1 This is a schematic diagram of the structure of an air conditioner according to an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the controller according to an embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram of the structure of an air conditioner according to another embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of the correspondence according to an embodiment of the present invention;

[0031] Figure 5 This is a schematic diagram of the cylinder motion structure according to an embodiment of the present invention;

[0032] Figure 6 This is a schematic diagram of piston force according to an embodiment of the present invention;

[0033] Figure 7 This is a schematic diagram of bearing lubrication according to an embodiment of the present invention;

[0034] Figure 8 This is a schematic diagram showing the relationship between the compressor speed and bearing temperature rise according to an embodiment of the present invention;

[0035] Figure 9 This is a flowchart of an air conditioner control method according to an embodiment of the present invention;

[0036] Figure 10 This is a general flowchart of a control method for an air conditioner according to an embodiment of the present invention;

[0037] Figure 11 This is a logic diagram for calculating oil film thickness according to an embodiment of the present invention;

[0038] Figure 12 This is a bearing temperature calculation logic diagram according to an embodiment of the present invention. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0041] 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 number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0042] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0043] This invention provides an air conditioner 10, with reference to... Figure 1 The air conditioner 10 includes a refrigeration system for exchanging heat with indoor air to meet cooling or heating needs.

[0044] The refrigeration system includes a compressor, a condenser, a throttling device 12, and an evaporator. In this invention, the air conditioner 10 performs a refrigeration cycle by using the compressor, condenser, throttling device 12, and evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies refrigerant to the conditioned and heat-exchanged air.

[0045] The compressor compresses refrigerant gas under high temperature and pressure and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process.

[0046] The throttling element 12 causes the high-temperature, high-pressure liquid refrigerant condensed in the condenser to expand into a low-pressure liquid refrigerant. The evaporator evaporates the refrigerant that has expanded in the throttling element 12 and returns the low-temperature, low-pressure refrigerant gas to the compressor.

[0047] The evaporator achieves a cooling effect by utilizing the latent heat of refrigerant evaporation to exchange heat with the material being cooled. Throughout the cycle, the air conditioner 10 can regulate the temperature of the indoor space.

[0048] The outdoor unit 2 of the air conditioner 10 refers to the part of the refrigeration cycle that includes the compressor and the outdoor heat exchanger. The indoor unit 1 of the air conditioner 10 includes the indoor heat exchanger, and the throttling component 12 can be provided in the indoor unit 1 or the outdoor unit 2.

[0049] The indoor and outdoor heat exchangers are used as condensers or evaporators. When the indoor heat exchanger is used as a condenser, the air conditioner 10 is used as a heater in heating mode, and when the indoor heat exchanger is used as an evaporator, the air conditioner 10 is used as a cooler in cooling mode.

[0050] The air conditioner 10 of this invention includes an indoor unit 1 and an outdoor unit 2, which can be configured as an integrated unit or a split unit. The indoor unit 1 can be configured as a wall-mounted unit, a ceiling-mounted unit, a ducted unit, etc., and the indoor unit 1 is installed on the top of the room.

[0051] Reference Figure 1 Taking indoor wall-mounted units as an example, indoor wall-mounted units are usually installed on indoor walls or other locations. For example, indoor cabinet units (not shown in the figure) are also a type of indoor unit 1.

[0052] Taking a split-type air conditioner as an example, the air conditioner 10 includes an indoor unit 1 and an outdoor unit 2. The outdoor unit 2 is usually installed outdoors and is used for heat exchange in the indoor environment.

[0053] Furthermore, as shown in the figure, the air conditioner 10 includes a controller 71 to control the operation of various components within the air conditioner 10, enabling each component to perform its predetermined functions. The air conditioner 10 also includes a control device 200, which, for example, is a remote control. This remote control has the function of communicating with the controller 71 using, for example, infrared or other communication methods. The remote control allows the user to perform various controls on the air conditioner 10, enabling interaction between the user and the air conditioner 10.

[0054] In this embodiment of the invention, the indoor unit 1 of the air conditioner 10 is located at the top or upper part of the room. Generally, the installation height of the indoor unit 1 is higher than the user's activity area. The indoor unit 1 includes a return air vent and an air outlet that communicate with the room. Indoor air passes through the return air vent into the indoor unit 1 and flows back into the room through the air outlet.

[0055] The refrigerant circulation loop in this invention allows the refrigerant to circulate within a loop consisting of a compressor, condenser, throttling device 12, and evaporator. One of the condenser and evaporator is an outdoor heat exchanger, and the other is an indoor heat exchanger. The indoor heat exchanger is used to exchange heat with the air inside the indoor unit 1, and the outdoor unit 2 heat exchanger is used to exchange heat with the air inside the outdoor unit 2, thereby fulfilling the cooling or heating requirements of the air conditioner 10.

[0056] The indoor unit 1 also includes an indoor fan, which is located near the return air vent or the air outlet of the indoor heat exchanger. It is used to deliver the heat-exchanged air to the room. The indoor fan has multiple speed settings to change the airflow speed at the air outlet.

[0057] An air guide plate is installed at the air outlet. By changing its relative rotation angle with the air outlet, the air guide plate adjusts the direction of the airflow through the air outlet, thereby affecting the stratification of indoor air temperature.

[0058] In the embodiment shown in this invention, the air conditioner 10 further includes a controller 71, which is a device that can generate operation control signals according to instruction operation codes and timing signals to instruct the air conditioner 10 to execute control commands. For example, in response to a power-on or power-off command issued by a user, the controller 71 can perform an operation related to the object selected by the power-on or power-off command.

[0059] This invention also provides a hardware structure diagram of the controller 71, as shown in the embodiment. 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, memory 82, and communication interface 84 are connected via a bus 81.

[0060] Processor 83 can be a central processing unit (CPU), a general-purpose processor (NP), a network processor (NP), a digital signal processor (DSP), a microprocessor (Microcontroller), a programmable logic device (PLD), or any combination thereof. Processor 83 can also be any other device with processing capabilities, such as a circuit, device, or software module. Processor 83 can also include multiple CPUs, and processor 83 can be a single-core processor 83 or a multi-core processor 83. Here, processor 83 can refer to one or more devices, circuits, or processing cores used to process data (e.g., computer program instructions).

[0061] The memory 82 can be a read-only memory (ROM) or other type of static storage device capable of storing static information and instructions, a random access memory (RAM) or other type of dynamic storage device capable of storing information and instructions, or an electrically erasable programmable read-only memory (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 universal optical discs, Blu-ray discs, etc.), a magnetic disk storage medium or other magnetic storage device, or any other medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer. This embodiment of the invention does not impose any limitations on this. The memory 82 can exist independently or be integrated with the processor 83. The memory 82 may contain computer program code. The processor 83 is used to execute the computer program code stored in the memory 82, thereby implementing the air conditioner control method provided in this embodiment of the invention.

[0062] 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 networks (WLAN), etc.). The communication interface 84 can be a module, circuit, transceiver, or any device capable of communication.

[0063] Bus 81 can be a Peripheral Component Interconnect (PCI) bus 81 or an Extended Industry Standard Architecture (EISA) bus 81, etc. Bus 81 can be divided into address bus 81, data bus 81, control bus 81, etc. For ease of representation, Figure 2 The bus is represented by only one thick line, but this does not mean that there is only one bus 81 or one type of bus 81.

[0064] The following is for reference. Figures 3-12 An air conditioner and its control method according to embodiments of the present invention are described.

[0065] Figure 3 This is a schematic diagram of the structure of an air conditioner according to an embodiment of the present invention. Figure 3As shown, an air conditioner 10 includes: a refrigerant circulation loop 11, a throttling component 12, an indoor fan 13, an outdoor fan 14, an outdoor temperature sensor 15, an exhaust temperature sensor 16, and a controller 71.

[0066] The refrigerant circulation loop 11 allows the refrigerant to circulate in a loop consisting of a compressor, condenser, expansion valve, and evaporator. One of the condenser and evaporator is an outdoor heat exchanger, and the other is an indoor heat exchanger. A throttling component 12 is located between the condenser and the evaporator. The throttling component 12 is used to limit or regulate the flow resistance of the refrigerant passing through it, thereby limiting or regulating the flow rate of the refrigerant passing through it. An indoor fan 13 is used to drive indoor air through the indoor heat exchanger by rotation, so that the refrigerant can exchange heat with the indoor air. An outdoor fan 14 is used to drive outdoor air through the outdoor heat exchanger by rotation, so that the refrigerant can exchange heat with the outdoor air. An outdoor temperature sensor 15 is used to detect the outdoor ambient temperature. An exhaust temperature sensor 16 is used to detect the exhaust temperature of the compressor.

[0067] In some embodiments, the throttling element 12 is configured as an electronic expansion valve. The electronic expansion valve increases the flow resistance of the refrigerant through it when its opening decreases, and decreases the flow resistance when its opening increases. Thus, the flow resistance of the refrigerant through it can be adjusted.

[0068] In other embodiments, the throttling element 12 is configured as a fixed throttling element such as a capillary tube. The opening of the fixed throttling element is fixed, thereby keeping the flow resistance of the refrigerant through it constant.

[0069] The controller 71 is configured to: periodically detect the operating parameters of the air conditioner 10 when the outdoor ambient temperature is higher than the preset temperature, wherein the operating parameters include: compressor speed, condenser condensing pressure, evaporator evaporating pressure and compressor exhaust temperature; determine bearing parameters to characterize the bearing lubrication state of the compressor based on the operating parameters; and control the operating state of the air conditioner 10 based on the bearing parameters.

[0070] In this embodiment, the bearing parameters of the compressor are determined based on the operating parameters. For example, the bearing parameters are denoted as W, the compressor speed is denoted as N, the condensing pressure of the condenser is denoted as Pd, the evaporating pressure of the evaporator is denoted as Ps, and the discharge temperature of the compressor is denoted as Td.

[0071] Specifically, when the controller 71 starts working, it first checks whether the outdoor ambient temperature is higher than the preset temperature. If it is determined that the outdoor ambient temperature is higher than the preset temperature, it is considered that the current outdoor ambient temperature is high, that is, the compressor is operating in a high-temperature environment. The controller 71 will enter the periodic detection mode to periodically obtain the operating parameters of the air conditioner 10.

[0072] After acquiring the operating parameters, the controller 71 determines the bearing parameter W based on these parameters. The bearing parameter W characterizes the bearing lubrication condition of the compressor. The quality of bearing lubrication significantly impacts the compressor's performance and lifespan; good lubrication reduces friction and wear, improving the compressor's operating efficiency and service life.

[0073] After determining the bearing parameter W, the controller 71 will control the operating status of the air conditioner 10 according to the operating parameters. If the bearing parameter W indicates that the bearing lubrication condition is poor, the controller 71 may take a series of measures to improve the lubrication condition, such as adjusting the compressor speed N and / or the operating status of the indoor fan 13, to ensure that the compressor operates under good lubrication conditions and avoid performance degradation or damage caused by poor lubrication.

[0074] If the bearing parameter W indicates that the bearing lubrication condition is good, the controller 71 will continue to monitor the operating status of the air conditioner 10 and adjust other operating parameters as needed to maintain the efficient and safe operation of the air conditioner.

[0075] In summary, when the outdoor environment is in a high-temperature condition, by periodically detecting the operating parameters of the air conditioner 10 and determining the bearing parameter W based on the operating parameters to control the operating status of the air conditioner 10, the controller 71 can achieve efficient management of the air conditioner 10, improve the cooling performance of the air conditioner 10, and also improve the reliability of the compressor.

[0076] In one embodiment of the present invention, when controlling the operating state of the air conditioner 10 according to the bearing parameter W, the controller 71 is configured to: when the bearing parameter W meets the first preset condition, control the air conditioner 10 to maintain the current operating state and return to the step of periodically detecting the operating parameters of the air conditioner 10; when the bearing parameter W does not meet the first preset condition, further determine whether the bearing parameter W meets the second preset condition; if the bearing parameter W meets the second preset condition, obtain the rotation speed of the outdoor fan 14, control the operating state of the outdoor fan 14 according to the rotation speed of the outdoor fan 14, otherwise, control the air conditioner 10 to stop and issue a stop alarm signal.

[0077] In this embodiment, when controlling the operating state of the air conditioner 10 according to the bearing parameter W, the controller 71 employs a refined control strategy.

[0078] Specifically, when the bearing parameter W meets the first preset condition, the controller 71 controls the air conditioner 10 to maintain the current operating state and returns to the step of periodically detecting the operating parameters of the air conditioner 10 to continue to periodically detect the operating parameters and ensure the stability of the air conditioner 10.

[0079] However, if the bearing parameter W does not meet the first preset condition, the system will further determine whether the bearing parameter W meets the second preset condition. If the bearing parameter W meets the second preset condition, the controller 71 will control the operating state of the outdoor fan 14 according to the obtained speed of the outdoor fan 14, so as to optimize the system performance and reduce potential damage to the bearing by adjusting the speed of the outdoor fan 14. If the bearing parameter W does not meet the second preset condition, the air conditioner 10 will be shut down and a shutdown alarm signal will be issued to remind the user or maintenance personnel to handle the situation in time, thereby avoiding further damage to the air conditioner 10 and improving the reliability of the air conditioner 10.

[0080] In one embodiment of the present invention, such as Figure 3 As shown, the air conditioner 10 also includes: an air guide assembly 17, which is disposed at the air outlet of the air conditioner 10. The air guide assembly 17 adjusts the air outlet angle by swinging or stopping its swing. When controlling the operating state of the outdoor fan 14 according to the speed of the outdoor fan 14, the controller 71 is configured to: determine whether the speed of the outdoor fan 14 reaches or exceeds a first speed threshold; if not, increase the speed of the outdoor fan 14 and control the outdoor fan 14 to run at the increased outdoor fan 14 speed; if yes, keep the speed of the outdoor fan 14 unchanged, obtain the air outlet angle, and control the operating state of the air guide assembly 17 according to the air outlet angle.

[0081] In this embodiment, the air guide assembly 17 is disposed at the air outlet of the air conditioner 10, and adjusts the air outlet angle by swinging or stopping its swing, so that the air conditioner 10 can flexibly control the air direction to meet the user's temperature comfort requirements.

[0082] Specifically, the controller 71 controls the operating status of the outdoor fan 14 based on the rotational speed of the outdoor motor 14. First, it compares the rotational speed of the outdoor fan 14 with a first rotational speed threshold. For example, the rotational speed of the outdoor fan 14 is denoted as N2, and the first rotational speed threshold is denoted as N2_max. If the rotational speed N2 of the outdoor fan 14 does not reach or exceeds the first rotational speed threshold N2_max, i.e., N2 < N2_max, then the rotational speed N2 of the outdoor fan 14 is increased, and the increased rotational speed of the outdoor fan 14 is denoted as Nc. For example, a speed difference ΔN2 is added to the rotational speed N2 of the outdoor fan 14, i.e., the increased rotational speed Nc = N2 + ΔN2, and the increased rotational speed Nc is obtained. The outdoor fan 14 is controlled to operate at the increased rotational speed Nc to improve the performance of the air conditioner 10.

[0083] If the rotational speed N2 of the outdoor fan 14 reaches or exceeds the first rotational speed threshold N2_max, i.e., N2≥N2_max, then the rotational speed N2 of the outdoor fan 14 is kept constant. Then, the air outlet angle is obtained, and the operating state of the air guide component 17 is controlled according to the obtained air outlet angle. For example, the air guide component 17 is controlled to swing or keep its current position unchanged, thereby optimizing the temperature distribution and comfort of the indoor environment.

[0084] In one embodiment of the present invention, when controlling the operating state of the air guide assembly 17 according to the air outlet angle, the controller 71 is configured to: determine whether the air outlet angle reaches or exceeds the target angle threshold; if not, control the air guide assembly 17 to swing in the direction of increasing the air outlet angle to increase the air outlet angle; if so, keep the position of the air guide assembly 17 unchanged, and obtain the rotation speed of the indoor fan 13, and control the operating state of the indoor fan 13 according to the rotation speed of the indoor fan 13.

[0085] In this embodiment, when controlling the operation of the air guide component 17 according to the air outlet angle, the air outlet angle is compared with the target angle threshold. If the air outlet angle does not reach or exceed the target angle threshold, the controller 71 will control the air guide component 17 to swing in the direction of increasing the air outlet angle. In this way, the air outlet angle will gradually increase until it reaches or exceeds the preset target angle threshold. If the air outlet angle reaches or exceeds the target angle threshold, the position of the air guide component 17 will remain unchanged, and its air outlet angle will no longer be adjusted.

[0086] At the same time, the rotation speed of the indoor fan 13 is obtained, and the operating status of the indoor fan 13 is controlled according to the rotation speed of the indoor fan 13. By adjusting the air outlet angle and the rotation speed of the indoor fan 13 through the controller 71, the operating efficiency and indoor comfort of the air conditioner 10 can be optimized.

[0087] In one embodiment of the present invention, when controlling the operating state of the indoor fan 13 according to the rotation speed of the indoor fan 13, the controller 71 is configured to: determine whether the rotation speed of the indoor fan 13 reaches or exceeds a second rotation speed threshold; if not, increase the rotation speed of the indoor fan 13 and control the indoor fan 13 to operate at the increased indoor fan 13 rotation speed; if yes, keep the rotation speed of the indoor fan 13 unchanged, and obtain the compressor rotation speed or condensing pressure, and control the compressor operating state according to the compressor rotation speed or condensing pressure.

[0088] In this embodiment, when controlling the operation of the indoor fan 13 according to its rotational speed, the controller 71 compares the rotational speed of the indoor fan 13 with a second rotational speed threshold. For example, the rotational speed of the indoor fan 13 is denoted as N1, and the second rotational speed threshold is denoted as N1_max. If the rotational speed N1 of the indoor fan 13 does not reach or exceed the second rotational speed threshold, i.e., N1 < N1_max, the rotational speed of the indoor fan 13 is increased, and the increased rotational speed of the indoor fan 13 is denoted as Na. For example, a speed difference ΔN1 is added to the rotational speed N1 of the indoor fan 13, i.e., the increased rotational speed Na = N1 + ΔN1, and the increased rotational speed Na is obtained. The controller then controls the indoor fan 13 to operate at the increased rotational speed Na to improve the performance of the air conditioner 10.

[0089] If the speed N1 of the indoor fan 13 reaches or exceeds the second speed threshold N1_max, i.e., N1≥N1_max, then the speed of the indoor fan 13 remains unchanged and is no longer adjusted. At the same time, the compressor speed N or condensing pressure Pd is obtained. These parameters can reflect the operating status of the compressor and the cooling capacity of the air conditioner 10.

[0090] Based on the obtained compressor speed N or condensing pressure Pd, the controller 71 will adjust the compressor's operating status to regulate and optimize the air conditioner 10, thereby improving the compressor's reliability.

[0091] In one embodiment of the present invention, when controlling the operating state of the compressor according to the compressor speed N or the condensing pressure Pd, the controller 71 is configured to: determine whether the compressor speed N reaches or exceeds a third speed threshold, or whether the condensing pressure Pd reaches or exceeds a preset pressure threshold; if not, increase the compressor speed N and control the compressor to run at the increased compressor speed; if yes, keep the compressor speed N unchanged.

[0092] In this embodiment, when controlling the compressor's operating state based on the compressor's rotational speed N or condensing pressure Pd, the controller 71 compares the compressor's rotational speed N with a third rotational speed threshold, or compares the condensing pressure Pd with a preset pressure threshold. For example, the third rotational speed threshold is denoted as N_max, and the preset pressure threshold is denoted as Pd_max. If the compressor's rotational speed N does not reach or exceed the third rotational speed threshold N_max, and the condensing pressure Pd does not reach or exceed the preset pressure threshold Pd_max, then the compressor's rotational speed N is increased, and the compressor is controlled to operate at the increased rotational speed to accelerate the refrigeration cycle.

[0093] If the compressor speed N reaches or exceeds the third speed threshold N_max, or the condensing pressure Pd reaches or exceeds the preset pressure threshold Pd_max, the compressor speed N will be kept constant to avoid compressor overload and ensure stable compressor operation.

[0094] In one embodiment of the present invention, the bearing parameter W includes: the oil film thickness of the compressor bearing.

[0095] The oil film thickness of the compressor bearing is denoted as h, for example.

[0096] Specifically, oil film thickness h refers to the thickness of the lubricating film formed by the lubricating oil inside the compressor bearing. Oil film thickness h can effectively reduce friction and wear inside the bearing, and improve the bearing's life and reliability.

[0097] In one embodiment of the present invention, the first preset condition includes: the oil film thickness h reaches or exceeds a first preset thickness threshold; the second preset condition includes: the oil film thickness h reaches or exceeds a second preset thickness threshold, but does not reach the first preset thickness threshold, wherein the first preset thickness threshold is greater than the second preset thickness threshold.

[0098] In the embodiments, both the first preset condition and the second preset condition are related to the oil film thickness h, but each corresponds to a different thickness threshold.

[0099] Specifically, for example, the first preset thickness threshold is denoted as hmin and the second preset thickness threshold is denoted as hstop. When the oil film thickness h meets the first preset condition, that is, when the oil film thickness h reaches or exceeds the first preset thickness threshold hmin, the air conditioner 10 maintains the current operating state and continues to periodically detect the operating parameters to ensure the stability of the air conditioner 10.

[0100] However, if the oil film thickness h does not meet the first preset condition, it is further determined whether the oil film thickness h meets the second preset condition. If the oil film thickness h meets the second preset condition, that is, the oil film thickness h reaches or exceeds the second preset thickness threshold hstop, and does not reach the first preset thickness threshold hmin, that is, hstop≤h<hmin, then the operating status of other equipment of the air conditioner 10 is optimized and adjusted, such as adjusting the operating status of the outdoor fan 14, the indoor fan 13, the air guide assembly 17 and the compressor, so as to improve the reliability of the air conditioner 10.

[0101] In one embodiment of the present invention, when determining the bearing parameter W, which characterizes the bearing lubrication state of the compressor, based on the operating parameters, the controller 71 is configured to: determine the bearing load based on the condensing pressure Pd and the evaporating pressure Ps; determine the bearing lubricating oil viscosity based on the exhaust temperature Td and the condensing pressure Pd; and determine the oil film thickness based on the bearing load, the bearing lubricating oil viscosity, and the compressor speed N.

[0102] In an embodiment, the bearing load is denoted as P, and the bearing lubricant viscosity is denoted as η.

[0103] Specifically, the compressor speed N can be directly read by the controller 71; the condensing pressure Pd and evaporating pressure Ps can be obtained by pressure sensors, or by temperature sensors placed at the condenser and evaporator to collect the data and convert it into pressure; the exhaust temperature Td can be obtained by temperature sensors.

[0104] When determining the bearing parameter W, which characterizes the bearing lubrication state of the compressor, based on operating parameters, controller 71 first accurately calculates the bearing load P based on the condensing pressure Pd and the evaporating pressure Ps. This is because the difference between the condensing pressure Pd and the evaporating pressure Ps directly affects the refrigerant circulation efficiency in the compressor, thus determining the workload the bearing needs to bear. Next, controller 71 uses the discharge temperature Td and the condensing pressure Pd to determine the bearing lubricating oil viscosity η, as these two parameters reflect the internal operating temperature and pressure state of the compressor, thereby affecting the fluidity and adhesion of the lubricating oil. Finally, based on the determined bearing load P, lubricating oil viscosity η, and compressor speed N, controller 71 can accurately calculate the oil film thickness h, ensuring that the bearing operates under optimal lubrication conditions, thereby improving the stability and service life of the compressor. This method of determining the bearing parameter W by integrating multiple operating parameters not only improves the intelligence level of the system but also ensures the efficient and safe operation of the compressor.

[0105] The load P of the compressor bearing mainly comes from the gas force formed by the pressure difference between the compression chamber and the intake chamber in the cylinder, and the centrifugal force formed by the eccentric rotation of rotating parts such as the crankshaft and piston. Since this invention mainly studies the reliability of the compressor bearing at low speed, the centrifugal force can be ignored, and the load of the bearing only considers the gas force.

[0106] In one embodiment of the present invention, when determining the oil film thickness h based on the bearing load P, the bearing lubricating oil viscosity η, and the compressor speed N, the controller 71 is configured to: based on the bearing load P, the bearing lubricating oil viscosity η, and the compressor speed N, obtain the oil film thickness h corresponding to the bearing load P, the bearing lubricating oil viscosity η, and the compressor speed N by querying a pre-calibrated mapping table of the correspondence between the bearing load P, the bearing lubricating oil viscosity η, the compressor speed N, and the oil film thickness h. The mapping table includes multiple sets of correspondences between the bearing load P, the bearing lubricating oil viscosity η, the compressor speed N, and the oil film thickness h. These multiple sets of correspondences include the correspondence between the bearing load P, the bearing lubricating oil viscosity η, the compressor speed N, and the oil film thickness h.

[0107] Specifically, when it is necessary to determine the oil film thickness h, the controller 71 uses a pre-calibrated mapping table of the correspondence between bearing load P, bearing lubricating oil viscosity η, compressor speed N, and oil film thickness h, which can be referenced. Figure 4 As shown, the mapping table stores multiple sets of correspondences between operating parameters. Each set of data accurately describes the relationship between bearing load P, bearing lubricating oil viscosity η, compressor speed N, and oil film thickness h under specific conditions.

[0108] When the controller 71 obtains the current bearing load P, bearing lubricating oil viscosity η, and compressor speed N, it can immediately look up the oil film thickness h that matches these operating parameters in the mapping table. This mapping table-based query method is not only fast but also ensures the accuracy of the results.

[0109] In this way, the controller 71 can determine the optimal oil film thickness h in real time based on the current operating parameters, thereby ensuring that the compressor bearing operates under optimal lubrication conditions and improving the stability and service life of the compressor.

[0110] In one embodiment of the present invention, when determining the oil film thickness h based on the bearing load P, the bearing lubricating oil viscosity η, and the compressor speed N, the controller 71 is configured to: obtain the oil film thickness h corresponding to the bearing load P, the bearing lubricating oil viscosity η, and the compressor speed N by fitting an equation based on a pre-calibrated fitting model of the relationship between the bearing load P, the bearing lubricating oil viscosity η, the compressor speed N, and the oil film thickness h.

[0111] In this embodiment, when the controller 71 determines the oil film thickness h based on the bearing load P, the bearing lubricating oil viscosity η, and the compressor speed N, it uses a fitting model based on a pre-calibrated relationship between the bearing load P, the bearing lubricating oil viscosity η, the compressor speed N, and the oil film thickness h.

[0112] The controller 71 first obtains the current bearing load P, bearing lubricating oil viscosity η, and compressor speed N, substitutes these operating parameters into the pre-fitted equation, and calculates the corresponding oil film thickness h.

[0113] Specifically, when determining the oil film thickness h based on operating parameters, refer to Figure 5 The diagram shown is of the internal motion mechanism of the compressor cylinder, with a cylinder working volume V. p The area A is formed by the inner wall of the cylinder and the outer wall of the piston. p The product of the cylinder height H1 and the sliding vane. p Divided into inspiratory chamber volume V s With compression chamber volume V d Both parts change with the crankshaft's rotation angle θ. The compression chamber volume Vd The calculation can be found in the fitting equations (1) to (4), and the volume occupied by the slider is ignored in the calculation.

[0114] V p =π(R) 2 -r 2 H1...(1)

[0115] V s =A s H1...(2)

[0116]

[0117] V d =V p -V s ...(4)

[0118] The volume V of the compression chamber was calculated. d Then, the pressure P in the compression chamber can be calculated using the ideal gas polytropic equation. θ That is, equation (5). Under the pressure difference between the compression chamber and the intake chamber, the piston is subjected to the gas force from the compression chamber to the intake chamber. The force state of the piston can be referred to Figure 6 The calculation of the gas force F can be referenced by fitting equations (6) and (7), in which the gas force on the piston is first transmitted to the eccentric part of the crankshaft, and then to the bearing of the compressor.

[0119]

[0120] F = LH1(P θ -P s ...(6)

[0121]

[0122] When the compressor is running normally, the gap between the crankshaft and the bearing is filled with lubricating oil. Under the action of viscous force, the lubricating oil will flow with the rotation of the crankshaft. As the flow space decreases, the oil pressure gradually increases, and the oil film reaction force formed supports the gas force on the crankshaft.

[0123] refer to Figure 7 The diagram shows the geometric relationship of the bearing parameters. The distance h between any point on the outer wall of the crankshaft and the inner wall of the bearing is the oil film thickness. Under the action of external load, the crankshaft will have a certain displacement, so there is a first preset thickness threshold h. min Location, first preset thickness threshold h min The location can be understood as the location of minimum oil film thickness. The oil film thickness h and oil film pressure P are obtained by solving the modified Reynolds equation, referring to the fitting equations (8) to (14).

[0124]

[0125]

[0126]

[0127]

[0128]

[0129]

[0130]

[0131] Therefore, the oil film thickness h can be calculated based on the above operating parameters.

[0132] On the other hand, since the surfaces of the crankshaft and bearings are not completely smooth and have a certain degree of roughness, when the oil film thickness is small, the rough protrusions on the surface of the parts may come into contact, forming a partial contact state. The resulting contact force is calculated using an elastoplastic contact model, referring to the fitting equations (15) to (17).

[0133]

[0134]

[0135]

[0136] Table 1 shows the meaning of each parameter in the fitting equations (1) to (17).

[0137]

[0138]

[0139] Table 1

[0140] Using this fitting model-based method to determine the oil film thickness h allows the controller 71 to quickly calculate the optimal oil film thickness h based on current operating parameters, thereby ensuring that the compressor bearing operates under optimal lubrication conditions. This method not only improves the system's intelligence level but also enhances its adaptability and robustness.

[0141] For example, if the indoor ambient temperature is 60°C or 30°C, the air conditioner 10 operates in this environment and the temperature of the air conditioner 10 is set to 26°C, i.e., the preset temperature is 26°C. Since the outdoor ambient temperature is higher than the preset temperature, the step of periodically detecting the operating parameters of the air conditioner 10 can be performed.

[0142] The obtained indoor fan speed 13 is N1 = 800 rpm, outdoor fan speed 14 is N2 = 900 rpm. At this time, the air outlet angle of the air guide component 17 has not reached or exceeded the target angle threshold, that is, the position of the air guide component 17 is not the maximum air outlet angle position. The detected condensing pressure Pd = 4.6 MPa, evaporating pressure Ps = 1.5 MPa, exhaust temperature Td = 100℃, and compressor speed N = 28 rpm.

[0143] The oil film thickness calculated based on the obtained operating parameters is h = 0.75 μm, the first preset thickness hmin = 0.8 μm, the second preset thickness hstop = 0.6 μm, and hstop < h < hmin. At this time, the air conditioner 10 is controlled to enter the control optimization and adjustment section, that is, to obtain the speed N2 of the outdoor fan 14, and to control the operating state of the outdoor fan 14 according to the speed N2 of the outdoor fan 14.

[0144] Since the air outlet angle of the air guide component 17 has not reached or exceeded the target angle threshold, the air guide component 17 is controlled to swing in the direction of increasing the air outlet angle to increase the air outlet angle. After the air outlet angle of the air guide component 17 reaches or exceeds the target angle threshold, the position of the air guide component 17 is kept unchanged, and the rotational speed N1 of the indoor fan 13 is obtained.

[0145] The obtained indoor fan 13 speed N1 = 800 rpm, the second speed threshold N1_max = 1000 rpm, the indoor fan 13 speed N1 does not reach or exceed the second speed threshold N1_max, that is, the indoor fan 13 speed N1 is less than the second speed threshold N1_max, then the indoor fan 13 speed N1 is increased, the increased indoor fan 13 speed Na = 900 rpm is obtained, and the control optimization adjustment is exited, so that the indoor fan 13 runs at the increased speed Na.

[0146] Then, the controller 71 performs the step of periodically detecting the operating parameters of the air conditioner 10. At this time, the condensing pressure Pd = 4.6MPa, the evaporating pressure Ps = 1.55MPa, the exhaust temperature Td = 99℃, the compressor speed N = 28rps, and the oil film thickness h = 0.77μm is calculated. Since hstop < h < hmin, the controller 71 controls the air conditioner 10 to enter the control optimization and adjustment section, that is, the controller 71 controls the operating state of the indoor fan 13 according to the speed N1 of the indoor fan 13.

[0147] Since the indoor fan 13 is running at the increased speed Na, the obtained speed N1 of the indoor fan 13 is 900 rpm, and the second speed threshold N1_max is 1000 rpm. The speed N1 of the indoor fan 13 has not reached or exceeded the second speed threshold N1_max. Similarly, the speed N1 of the indoor fan 13 is increased, and the increased speed of the indoor fan 13 is 1000 rpm. The control optimization adjustment is then exited, so that the indoor fan 13 runs at the increased speed of 1000 rpm.

[0148] Next, the step of periodically detecting the operating parameters of the air conditioner 10 is continued. The condensing pressure Pd = 4.6 MPa, the evaporating pressure Ps = 1.6 MPa, the exhaust temperature Td = 97℃, the compressor speed N = 28 rpm, and the calculated oil film thickness h = 0.79 μm. Since hstop < h < hmin, it is further determined whether the speed N1 of the indoor fan 13 reaches or exceeds the second speed threshold N1_max. After determining that the indoor fan speed N1 = 1000 rpm = N1_max, the compressor speed N or the condensing pressure Pd is obtained, so as to control the operating status of the compressor according to the compressor speed N and the condensing pressure Pd.

[0149] Given the obtained condensing pressure Pd = 4.6 MPa, evaporating pressure Ps = 1.65 MPa, exhaust temperature Td = 96℃, and compressor speed N = 28 rpm, the calculated oil film thickness h = 0.81 μm is obtained, and h > hmin. At this time, the oil film thickness h meets the first preset condition, so no specific operation is performed, and the air conditioner 10 is controlled to maintain the current operating state.

[0150] In another embodiment of the invention, the bearing parameter W includes: the bearing temperature rise of the compressor.

[0151] Among them, the bearing temperature rise can directly reflect the thermal state of the bearing during operation. The bearing temperature rise of the compressor is denoted as ΔT for example.

[0152] In this embodiment, when the bearing is working, a certain amount of heat will be generated inside the bearing due to the friction and heat of the internal parts. If this heat cannot be effectively dissipated, the temperature of the bearing and the surrounding environment will rise. Therefore, this temperature rise phenomenon is called bearing temperature rise ΔT.

[0153] By monitoring and controlling the bearing temperature rise ΔT, the operating status of the bearing can be understood in a timely manner, preventing problems such as bearing overheating and damage, thereby ensuring the normal operation of the compressor, extending its service life, and improving the reliability of the compressor.

[0154] In one embodiment of the present invention, the first preset condition includes: the bearing temperature rise ΔT does not reach the first preset temperature threshold; the second preset condition includes: the bearing temperature rise ΔT reaches or exceeds the first preset temperature threshold, but does not reach the second preset temperature threshold, wherein the first preset temperature threshold is less than the second preset temperature threshold.

[0155] In this embodiment, the preset conditions for the bearing temperature rise ΔT are set to two different preset temperature thresholds, and the corresponding operation is performed based on the comparison results between the bearing temperature rise ΔT and the two different preset temperature thresholds.

[0156] Specifically, for example, the first preset temperature threshold is denoted as △T_max and the second preset temperature threshold is denoted as △T_stop. When the bearing temperature rise △T meets the first preset condition, that is, the bearing temperature rise △T has not reached the first preset temperature threshold △T_max, the air conditioner 10 maintains the current operating state and continues to periodically detect the operating parameters to ensure the stability of the air conditioner 10.

[0157] However, if the bearing temperature rise ΔT does not meet the first preset condition, it is further determined whether the bearing temperature rise ΔT meets the second preset condition. If the bearing temperature rise ΔT meets the second preset condition, that is, the bearing temperature rise ΔT reaches or exceeds the first preset temperature threshold ΔT_max, but does not reach the second preset temperature threshold ΔT_stop, i.e. ΔT_max≤ΔT<ΔT_stop, then the operating status of other equipment of the air conditioner 10 is optimized and adjusted, such as adjusting the operating status of the outdoor fan 14, the indoor fan 13, the air guide assembly 17 and the compressor, so as to improve the reliability of the air conditioner 10.

[0158] In one embodiment of the present invention, when determining the bearing parameter W, which characterizes the bearing lubrication state of the compressor, based on the operating parameters, the controller 71 is configured to: determine the bearing load P based on the condensing pressure Pd and the evaporating pressure Ps; determine the bearing lubricating oil viscosity η based on the exhaust temperature Td and the condensing pressure Pd; and determine the bearing temperature rise ΔT based on the bearing load P, the bearing lubricating oil viscosity η, and the compressor speed N.

[0159] In this embodiment, when the controller 71 determines the bearing parameter W, which characterizes the bearing lubrication state of the compressor, based on the operating parameters, it first accurately calculates the bearing load P based on the condensing pressure Pd and the evaporating pressure Ps. This is because the difference between the condensing pressure Pd and the evaporating pressure Ps directly affects the refrigerant circulation efficiency in the compressor, thus determining the workload that the bearing needs to bear. Next, the controller 71 uses the discharge temperature Td and the condensing pressure Pd to determine the bearing lubricating oil viscosity η, as these two parameters reflect the internal operating temperature and pressure state of the compressor, thereby affecting the fluidity and adhesion of the lubricating oil. Finally, based on the determined bearing load P, lubricating oil viscosity η, and compressor speed N, the controller 71 can accurately calculate the bearing temperature rise ΔT, ensuring that the bearing operates under optimal lubrication conditions, thereby improving the stability and service life of the compressor.

[0160] In one embodiment of the present invention, when determining the bearing temperature rise ΔT based on the bearing load P, the bearing lubricating oil viscosity η, and the compressor speed N, the controller 71 is configured to: based on the bearing load P, the bearing lubricating oil viscosity η, and the compressor speed N, obtain the bearing temperature rise ΔT corresponding to the bearing load P, the bearing lubricating oil viscosity η, and the compressor speed N by querying a pre-calibrated mapping table of the correspondence between the bearing load P, the bearing lubricating oil viscosity η, the compressor speed N, and the bearing temperature rise ΔT. The mapping table includes multiple sets of correspondences between the bearing load P, the bearing lubricating oil viscosity η, the compressor speed N, and the bearing temperature rise ΔT. These multiple sets of correspondences include the correspondence between the bearing load P, the bearing lubricating oil viscosity η, the compressor speed N, and the bearing temperature rise ΔT.

[0161] In this embodiment, when it is necessary to determine the bearing temperature rise ΔT, the controller 71 uses a pre-calibrated mapping table of the correspondence between bearing load P, bearing lubricating oil viscosity η, compressor speed N, and bearing temperature rise ΔT, which can be referenced. Figure 4 and Figure 8 The mapping table stores multiple sets of correspondences between operating parameters. Each set of data accurately describes the relationship between bearing load P, bearing lubricant viscosity η, compressor speed N, and bearing temperature rise ΔT under specific conditions.

[0162] When the controller 71 obtains the current bearing load P, bearing lubricant viscosity η, and compressor speed N, it can immediately look up the bearing temperature rise ΔT that matches these operating parameters in the mapping table. This mapping table-based query method is not only fast but also ensures the accuracy of the results.

[0163] In this way, the controller 71 can determine the bearing temperature rise ΔT in real time based on the current operating parameters, thereby ensuring that the compressor bearing operates under optimal lubrication conditions and improving the stability and service life of the compressor.

[0164] In one embodiment of the present invention, when determining the bearing temperature rise ΔT based on the bearing load P, the bearing lubricating oil viscosity η, and the compressor speed N, the controller 71 is configured to: obtain the bearing temperature rise ΔT corresponding to the bearing load P, the bearing lubricating oil viscosity η, and the compressor speed N by fitting an equation based on a pre-calibrated fitting model of the relationship between the bearing load P, the bearing lubricating oil viscosity η, the compressor speed N, and the bearing temperature rise ΔT.

[0165] In this embodiment, when the controller 71 determines the bearing temperature rise ΔT based on the bearing load P, the bearing lubricating oil viscosity η, and the compressor speed N, it uses a fitting model based on a pre-calibrated relationship between the bearing load P, the bearing lubricating oil viscosity η, the compressor speed N, and the bearing temperature rise ΔT.

[0166] The controller 71 first obtains the current bearing load P, bearing lubricating oil viscosity η, and compressor speed N, substitutes these operating parameters into the pre-fitted equation, and calculates the corresponding bearing temperature rise ΔT.

[0167] Specifically, the calculation methods for obtaining the bearing load P, bearing lubricating oil viscosity η, and compressor speed N are similar to those for calculating the operating parameters required for the oil film thickness h. Please refer to the calculation section on oil film thickness h for details. To reduce redundancy, these details will not be repeated here.

[0168] On the other hand, in determining the bearing temperature rise ΔT based on the bearing load P, the bearing lubricant viscosity η, and the compressor speed N, it is also necessary to further obtain the contact pressure, PV value, and bearing oil supply. For example, the contact pressure can be denoted as Pc, and the bearing oil supply can be denoted as Q.

[0169] Among them, the PV value is used to describe the product of the pressure P of the sealing surface and the relative speed (such as the speed N of the compressor). The PV value is proportional to the heat Q (J) generated by the friction of the end face and the wear rate of the end face. Therefore, the PV value can be regarded as an index of heat resistance and wear resistance. Heat resistance is a performance parameter when the friction pair is working, and it is the basis for designing and calculating the temperature rise of the end face and the required cooling amount. Wear resistance is a requirement during use and is a more intuitive parameter.

[0170] After obtaining the oil film thickness h, the contact pressure Pc is obtained. The PV value can be calculated based on the contact pressure Pc and the compressor speed N, i.e., PV value = PcN. Then, the bearing temperature rise ΔT can be calculated based on the PV value and the bearing oil supply Q.

[0171] Wherein, the bearing oil supply Q is the product of the compressor speed N and the oil supply hole area S, i.e., Q = N / S, and the resulting bearing temperature rise ΔT is:

[0172]

[0173] Using this fitting model-based method to determine the bearing temperature rise ΔT allows the controller 71 to quickly calculate the bearing temperature rise ΔT based on current operating parameters, thereby ensuring that the compressor bearing operates under optimal lubrication conditions. This method not only improves the system's intelligence level but also enhances its adaptability and robustness.

[0174] For example, if the indoor ambient temperature is 63°C or 30°C, the air conditioner 10 operates in this environment and the temperature of the air conditioner 10 is set to 26°C, that is, the preset temperature is 26°C.

[0175] When the outdoor ambient temperature is determined to be higher than the preset temperature, the operating parameters of the air conditioner 10 are periodically checked. The obtained speed of the indoor fan 13 is N1 = 1000 rpm, the speed of the outdoor fan 14 is N2 = 1000 rpm, and the air outlet angle of the air guide assembly 17 reaches or exceeds the target angle threshold. At a certain moment, the detected condensing pressure Pd = 4.6 MPa, evaporating pressure Ps = 1.5 MPa, exhaust temperature Td = 100℃, and compressor speed N = 28 rpm.

[0176] The bearing temperature rise ΔT = 110℃ is calculated from the detected parameters. The first preset temperature threshold ΔT_max = 100℃ and the second preset temperature threshold ΔT_stop = 200℃. Since ΔT_stop > ΔT > ΔT_max, the air conditioner 10 enters the control optimization and adjustment section, that is, it obtains the speed N2 of the outdoor fan 14 and controls the operating state of the outdoor fan 14 according to the speed N2 of the outdoor fan 14.

[0177] Since the rotational speed N2 of the outdoor fan 14 reaches the first rotational speed threshold N2_max, the rotational speed N2 of the outdoor fan 14 is kept constant, and the air outlet angle is obtained. The operating state of the air guide component is controlled according to the air outlet angle. At this time, the air outlet angle of the air guide component 17 is obtained and reaches the target angle threshold. The position of the air guide component 17 is kept constant, and the rotational speed N1 of the indoor fan 13 is obtained. The operating state of the indoor fan 13 is controlled according to the rotational speed N1 of the indoor fan 13.

[0178] Specifically, when the indoor fan 13 speed N1 reaches the second speed threshold N1_max, the indoor fan 13 speed N1 remains unchanged, and the compressor speed N or condensing pressure Pd is obtained. The compressor's operating state is controlled according to the compressor speed N or condensing pressure Pd. If the compressor speed N does not reach or exceeds the third speed threshold, that is, the compressor speed N is less than the third speed threshold, the compressor speed N is increased to obtain the adjusted compressor speed of 30 rpm, and the control optimization adjustment is exited, and the compressor is controlled to run at the increased compressor speed.

[0179] Next, the step of periodically detecting the operating parameters of the air conditioner 10 is performed. Since the obtained condensing pressure Pd = 4.65 MPa, evaporating pressure Ps = 1.45 MPa, Td = exhaust temperature 103℃, and compressor speed N = 30 rpm, the bearing temperature rise ΔT = 95℃ is calculated, and ΔT_max > ΔT, that is, the bearing temperature rise ΔT meets the first preset condition, so no specific operation is performed, and the air conditioner 10 is controlled to maintain the current operating state.

[0180] Alternatively, in another specific embodiment, the obtained indoor ambient temperature is 60°C or 30°C, the air conditioner 10 operates in this environment, and the temperature of the air conditioner 10 is set to 26°C, that is, the preset temperature is 26°C.

[0181] When the outdoor ambient temperature is determined to be higher than the preset temperature, the operating parameters of the air conditioner 10 are periodically checked. The obtained speeds are: indoor fan 13 N1 = 800 rpm, outdoor fan 14 N2 = 800 rpm, and the air outlet angle of the air guide assembly 17 reaches or exceeds the target angle threshold. At a certain moment, the detected condensing pressure Pd = 4.7 MPa, evaporating pressure Ps = 1.5 MPa, exhaust temperature Td = 100℃, and compressor speed N = 34 rpm.

[0182] The oil film thickness and bearing temperature rise ΔT calculated from the detected operating parameters are 210℃, the first preset temperature threshold ΔT_max = 100℃, the second preset temperature threshold ΔT_stop = 200℃, and ΔT_stop < ΔT, that is, the bearing temperature rise ΔT does not meet the second preset condition. At this time, the air conditioner 10 is controlled to stop and a stop alarm signal is issued.

[0183] According to an embodiment of the present invention, the air conditioner 10 acquires the outdoor ambient temperature through the outdoor temperature sensor 16, compares the acquired outdoor ambient temperature with a preset temperature, and determines that when the outdoor ambient temperature is higher than the preset temperature, the controller 71 periodically detects the operating parameters of the air conditioner 10, namely, periodically detects the compressor speed, the condensing pressure of the condenser, the evaporating pressure of the evaporator, and the exhaust temperature of the compressor. Based on the acquired operating parameters, bearing parameters can be determined to characterize the bearing lubrication state of the compressor. Thus, based on the determined bearing parameters, the operating state of the air conditioner 10 can be controlled to ensure that the compressor operates under good lubrication conditions, improve the reliability of the compressor, and thereby improve the cooling performance of the air conditioner 10.

[0184] Further embodiments of the present invention disclose a control method for an air conditioner, used in any of the above embodiments, such as... Figure 9 As shown, the method includes the following steps:

[0185] Step S1: When the outdoor ambient temperature is higher than the preset temperature, periodically check the operating parameters of the air conditioner. The operating parameters include: compressor speed, condenser condensing pressure, evaporator evaporating pressure, and compressor exhaust temperature.

[0186] Step S2: Determine the bearing parameters used to characterize the bearing lubrication state of the compressor based on the operating parameters.

[0187] Step S3: Control the operating status of the air conditioner according to the bearing parameters.

[0188] In one embodiment of the present invention, such as Figure 10 As shown, when controlling the operating status of the air conditioner based on bearing parameters, the process includes: when the bearing parameters meet the first preset condition, controlling the air conditioner to maintain its current operating status and returning to the step of periodically detecting the operating parameters of the air conditioner; when the bearing parameters do not meet the first preset condition, further determining whether the bearing parameters meet the second preset condition; if the bearing parameters meet the second preset condition, obtaining the speed of the outdoor fan and controlling the operating status of the outdoor fan according to the speed of the outdoor fan; otherwise, controlling the air conditioner to stop and issuing a stop alarm signal.

[0189] In one embodiment of the present invention, such as Figure 10As shown, when controlling the operating state of the outdoor fan according to the speed of the outdoor fan, the process includes: determining whether the speed of the outdoor fan has reached or exceeded a first speed threshold; if not, increasing the speed of the outdoor fan and controlling the outdoor fan to operate at the increased speed; if yes, keeping the speed of the outdoor fan unchanged, obtaining the air outlet angle, and controlling the operating state of the air guide component according to the air outlet angle. The air guide component is installed at the air outlet of the air conditioner, and the guide component adjusts the air outlet angle by swinging or stopping its swing.

[0190] In one embodiment of the present invention, such as Figure 10 As shown, when controlling the operation of the air guide component according to the air outlet angle, the process includes: determining whether the air outlet angle has reached or exceeded the target angle threshold; if not, controlling the air guide component to swing in the direction of increasing the air outlet angle to increase the air outlet angle; if so, keeping the position of the air guide component unchanged, and obtaining the speed of the indoor fan, and controlling the operation of the indoor fan according to the speed of the indoor fan.

[0191] In one embodiment of the present invention, such as Figure 10 As shown, when controlling the operating status of the indoor fan according to the indoor fan speed, the process includes: determining whether the indoor fan speed has reached or exceeded the second speed threshold; if not, increasing the indoor fan speed and controlling the indoor fan to operate at the increased indoor fan speed; if so, keeping the indoor fan speed unchanged, and obtaining the compressor speed or condensing pressure, and controlling the compressor operating status according to the compressor speed or condensing pressure.

[0192] In one embodiment of the present invention, such as Figure 10 As shown, when controlling the compressor's operating status based on the compressor's speed or condensing pressure, the process includes: determining whether the compressor's speed has reached or exceeded a third speed threshold, or whether the condensing pressure has reached or exceeded a preset pressure threshold; if not, increasing the compressor's speed and controlling the compressor to operate at the increased compressor speed; if so, keeping the compressor's speed unchanged.

[0193] In one embodiment of the present invention, the bearing parameters include: the oil film thickness of the compressor bearing.

[0194] In one embodiment of the present invention, the first preset condition includes: the oil film thickness reaches or exceeds a first preset thickness threshold; the second preset condition includes: the oil film thickness reaches or exceeds a second preset thickness threshold, but does not reach the first preset thickness threshold, wherein the first preset thickness threshold is greater than the second preset thickness threshold.

[0195] In one embodiment of the present invention, such as Figure 11As shown, when determining the bearing parameters used to characterize the bearing lubrication state of the compressor based on the operating parameters, the following are included: determining the bearing load based on the condensing pressure and evaporating pressure; determining the bearing lubricating oil viscosity based on the exhaust temperature and condensing pressure; and determining the oil film thickness based on the bearing load, bearing lubricating oil viscosity, and compressor speed.

[0196] In one embodiment of the present invention, determining the oil film thickness based on the bearing load, bearing lubricating oil viscosity, and compressor speed includes: based on the bearing load, bearing lubricating oil viscosity, and compressor speed, obtaining the oil film thickness corresponding to the bearing load, bearing lubricating oil viscosity, and compressor speed by querying a pre-calibrated mapping table of correspondences between bearing load, bearing lubricating oil viscosity, compressor speed, and oil film thickness. The mapping table includes multiple sets of correspondences between bearing load, bearing lubricating oil viscosity, compressor speed, and oil film thickness, and these multiple sets of correspondences include the correspondence between bearing load, bearing lubricating oil viscosity, compressor speed, and oil film thickness.

[0197] In one embodiment of the present invention, when determining the oil film thickness based on the bearing load, bearing lubricating oil viscosity and compressor speed, the method includes: fitting a model based on a pre-calibrated relationship between the bearing load, bearing lubricating oil viscosity, compressor speed and oil film thickness, and obtaining the oil film thickness corresponding to the bearing load, bearing lubricating oil viscosity and compressor speed by fitting equations.

[0198] In one embodiment of the present invention, the bearing parameters include: the bearing temperature rise of the compressor.

[0199] In one embodiment of the present invention, the first preset condition includes: the bearing temperature rise does not reach the first preset temperature threshold; the second preset condition includes: the bearing temperature rise reaches or exceeds the first preset temperature threshold, but does not reach the second preset temperature threshold, wherein the first preset temperature threshold is less than the second preset temperature threshold.

[0200] In one embodiment of the present invention, such as Figure 12 As shown, when determining the bearing parameters used to characterize the bearing lubrication state of the compressor based on the operating parameters, the following are included: determining the bearing load based on the condensing pressure and evaporating pressure; determining the bearing lubricating oil viscosity based on the exhaust temperature and condensing pressure; and determining the bearing temperature rise based on the bearing load, bearing lubricating oil viscosity, and compressor speed.

[0201] In one embodiment of the present invention, such as Figure 12As shown, in the process of determining the bearing temperature rise based on the bearing load, bearing lubricating oil viscosity and compressor speed, it is also necessary to further obtain the contact pressure, PV value and bearing oil supply. The bearing temperature rise is then determined based on the obtained contact pressure, PV value and bearing oil supply.

[0202] In one embodiment of the present invention, when determining the bearing temperature rise based on the bearing load, bearing lubricating oil viscosity, and compressor speed, the method includes: based on the bearing load, bearing lubricating oil viscosity, and compressor speed, obtaining the bearing temperature rise corresponding to the bearing load, bearing lubricating oil viscosity, and compressor speed by querying a pre-calibrated mapping table of the correspondence between bearing load, bearing lubricating oil viscosity, compressor speed, and bearing temperature rise. The mapping table includes multiple sets of correspondences between bearing load, bearing lubricating oil viscosity, compressor speed, and bearing temperature rise, and these multiple sets of correspondences include the correspondence between bearing load, bearing lubricating oil viscosity, compressor speed, and bearing temperature rise.

[0203] In one embodiment of the present invention, when determining the bearing temperature rise based on the bearing load, bearing lubricating oil viscosity and compressor speed, the method includes: fitting a model based on a pre-calibrated relationship between the bearing load, bearing lubricating oil viscosity, compressor speed and bearing temperature rise, and obtaining the bearing temperature rise corresponding to the bearing load, bearing lubricating oil viscosity and compressor speed by fitting equations.

[0204] According to the air conditioner control method of the present invention, by comparing the outdoor ambient temperature and the preset temperature, when the outdoor ambient temperature is higher than the preset temperature, the operating parameters of the air conditioner are periodically detected, namely, the compressor speed, the condensing pressure of the condenser, the evaporating pressure of the evaporator, and the discharge temperature of the compressor are periodically detected. Based on the obtained operating parameters, bearing parameters can be determined to characterize the bearing lubrication state of the compressor. Thus, the operating state of the air conditioner can be controlled according to the determined bearing parameters to ensure that the compressor operates under good lubrication conditions, improve the reliability of the compressor, and thereby improve the cooling performance of the air conditioner.

[0205] It should be noted that the control method of the air conditioner in this embodiment of the invention is similar to the specific implementation of the air conditioner in this embodiment of the invention. Please refer to the description of the air conditioner section for details. To reduce redundancy, it will not be repeated here.

[0206] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0207] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An air conditioner, characterized in that, include: The refrigerant circulation loop allows the refrigerant to circulate in a loop consisting of a compressor, condenser, expansion valve, and evaporator. One of the condensers and the other of the evaporator is an outdoor heat exchanger and the other is an indoor heat exchanger. A throttling component is disposed between the condenser and the evaporator. The throttling component is used to limit or regulate the flow resistance of the refrigerant passing through it, thereby limiting or regulating the flow rate of the refrigerant passing through it. An indoor fan is used to drive indoor air through the indoor heat exchanger by rotation, so that the refrigerant can exchange heat with the indoor air; An outdoor fan is used to drive outdoor air through the outdoor heat exchanger by rotation, so that the refrigerant can exchange heat with the outdoor air. Outdoor temperature sensor, used to detect outdoor ambient temperature; An exhaust temperature sensor is used to detect the exhaust temperature of the compressor; The controller is configured to: When the outdoor ambient temperature is determined to be higher than the preset temperature, the operating parameters of the air conditioner are periodically detected, wherein the operating parameters include: the compressor speed, the condensing pressure of the condenser, the evaporating pressure of the evaporator, and the exhaust temperature of the compressor; Based on the operating parameters, determine the bearing parameters used to characterize the bearing lubrication state of the compressor; The operating status of the air conditioner is controlled based on the bearing parameters.

2. The air conditioner according to claim 1, characterized in that, When controlling the operating state of the air conditioner based on the bearing parameters, the controller is configured to: When the bearing parameters meet the first preset condition, the air conditioner is controlled to maintain the current operating state and return to the step of periodically detecting the operating parameters of the air conditioner; If the bearing parameters do not meet the first preset condition, then it is further determined whether the bearing parameters meet the second preset condition. If the bearing parameters meet the second preset condition, the rotational speed of the outdoor fan is obtained, and the operating status of the outdoor fan is controlled according to the rotational speed of the outdoor fan; otherwise, the air conditioner is controlled to stop and a shutdown alarm signal is issued.

3. The air conditioner according to claim 2, characterized in that, The air conditioner also includes: an air guide assembly disposed at the air outlet of the air conditioner, wherein the air guide assembly adjusts the air outlet angle by swinging or stopping its swing. When controlling the operating state of the outdoor fan according to its rotational speed, the controller is configured to: Determine whether the rotational speed of the outdoor fan reaches or exceeds a first rotational speed threshold; If not, increase the speed of the outdoor fan and control the outdoor fan to operate at the increased outdoor fan speed; If so, the rotation speed of the outdoor fan remains constant, and the air outlet angle is obtained. The operating state of the air guide assembly is then controlled based on the air outlet angle.

4. The air conditioner according to claim 3, characterized in that, When controlling the operating state of the air guide assembly according to the air outlet angle, the controller is configured to: Determine whether the air outlet angle reaches or exceeds the target angle threshold; If not, the air guide assembly is controlled to swing in the direction of increasing the air outlet angle, so as to increase the air outlet angle; If so, the position of the air guide component remains unchanged, and the rotation speed of the indoor fan is obtained. The operating status of the indoor fan is controlled according to the rotation speed of the indoor fan.

5. The air conditioner according to claim 4, characterized in that, When controlling the operating state of the indoor fan according to its rotational speed, the controller is configured to: Determine whether the rotational speed of the indoor fan reaches or exceeds the second rotational speed threshold; If not, increase the speed of the indoor fan and control the indoor fan to operate at the increased indoor fan speed; If so, the indoor fan speed is kept constant, and the compressor speed or the condensing pressure is obtained. The operating status of the compressor is controlled according to the compressor speed or the condensing pressure.

6. The air conditioner according to claim 5, characterized in that, When controlling the operating state of the compressor based on the compressor speed or the condensing pressure, the controller is configured to: Determine whether the compressor speed reaches or exceeds the third speed threshold, or whether the condensing pressure reaches or exceeds the preset pressure threshold; If not, increase the speed of the compressor and control the compressor to operate at the increased compressor speed; If so, then keep the compressor speed constant.

7. The air conditioner according to claim 2, characterized in that, The bearing parameters include the oil film thickness of the compressor bearing.

8. The air conditioner according to claim 7, characterized in that, The first preset condition includes: the oil film thickness reaches or exceeds a first preset thickness threshold; The second preset condition includes: the oil film thickness reaches or exceeds the second preset thickness threshold, but does not reach the first preset thickness threshold, wherein the first preset thickness threshold is greater than the second preset thickness threshold.

9. The air conditioner according to claim 7, characterized in that, When determining the bearing parameters characterizing the bearing lubrication state of the compressor based on the operating parameters, the controller is configured to: The bearing load is determined based on the condensation pressure and the evaporation pressure. The bearing lubricating oil viscosity is determined based on the exhaust temperature and the condensation pressure. The oil film thickness is determined based on the bearing load, the bearing lubricating oil viscosity, and the compressor speed.

10. The air conditioner according to claim 9, characterized in that, When determining the oil film thickness based on the bearing load, the bearing lubricating oil viscosity, and the compressor speed, the controller is configured to: Based on the bearing load, the bearing lubricating oil viscosity, and the compressor speed, the oil film thickness corresponding to the bearing load, the bearing lubricating oil viscosity, the compressor speed, and the oil film thickness is obtained by querying a pre-calibrated mapping table of correspondences between bearing load, bearing lubricating oil viscosity, compressor speed, and oil film thickness. The mapping table includes multiple sets of correspondences between bearing load, bearing lubricating oil viscosity, compressor speed, and oil film thickness, including the correspondence between the bearing load, the bearing lubricating oil viscosity, the compressor speed, and the oil film thickness.

11. The air conditioner according to claim 9, characterized in that, When determining the oil film thickness based on the bearing load, the bearing lubricating oil viscosity, and the compressor speed, the controller is configured to: Based on a pre-calibrated fitting model of the relationship between bearing load, bearing lubricating oil viscosity, compressor speed and oil film thickness, the oil film thickness corresponding to the bearing load, bearing lubricating oil viscosity and compressor speed is obtained by fitting equations.

12. The air conditioner according to claim 2, characterized in that, The bearing parameters include: the bearing temperature rise of the compressor.

13. The air conditioner according to claim 12, characterized in that, The first preset condition includes: the bearing temperature rise does not reach the first preset temperature threshold; The second preset condition includes: the bearing temperature rise reaches or exceeds the first preset temperature threshold, but does not reach the second preset temperature threshold, wherein the first preset temperature threshold is less than the second preset temperature threshold.

14. The air conditioner according to claim 12, characterized in that, When determining the bearing parameters characterizing the bearing lubrication state of the compressor based on the operating parameters, the controller is configured to: The bearing load is determined based on the condensation pressure and the evaporation pressure. The bearing lubricating oil viscosity is determined based on the exhaust temperature and the condensation pressure. The bearing temperature rise is determined based on the bearing load, the bearing lubricating oil viscosity, and the compressor speed.

15. The air conditioner according to claim 14, characterized in that, When determining the bearing temperature rise based on the bearing load, the bearing lubricating oil viscosity, and the compressor speed, the controller is configured to: Based on the bearing load, the bearing lubricating oil viscosity, and the compressor speed, the bearing temperature rise corresponding to the bearing load, the bearing lubricating oil viscosity, the compressor speed, and the bearing temperature rise is obtained by querying a pre-calibrated mapping table of the correspondence between bearing load, bearing lubricating oil viscosity, compressor speed, and bearing temperature rise. The mapping table includes multiple sets of correspondences between bearing load, bearing lubricating oil viscosity, compressor speed, and bearing temperature rise, and these multiple sets of correspondences include the correspondence between the bearing load, the bearing lubricating oil viscosity, the compressor speed, and the bearing temperature rise.

16. The air conditioner according to claim 14, characterized in that, When determining the bearing temperature rise based on the bearing load, the bearing lubricating oil viscosity, and the compressor speed, the controller is configured to: Based on a pre-calibrated fitting model of the relationship between bearing load, bearing lubricating oil viscosity, compressor speed and bearing temperature rise, the bearing temperature rise corresponding to the bearing load, the bearing lubricating oil viscosity and the compressor speed is obtained by fitting equations.

17. A control method for an air conditioner, characterized in that, For an air conditioner as described in any one of claims 1-16, the control method includes: When the outdoor ambient temperature is determined to be higher than the preset temperature, the operating parameters of the air conditioner are periodically detected, wherein the operating parameters include: the compressor speed, the condensing pressure of the condenser, the evaporating pressure of the evaporator, and the exhaust temperature of the compressor; Based on the operating parameters, determine the bearing parameters used to characterize the bearing lubrication state of the compressor; The operating status of the air conditioner is controlled based on the bearing parameters.

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