Air conditioner and control method thereof

Abstract

The invention provides an air conditioner and a control method thereof.The air conditioner comprises a controller, and the controller is configured to obtain an operation mode of the air conditioner in response to a control instruction when the control instruction used for indicating the air conditioner to stop is received; when the air conditioner is in the refrigeration operation mode, the outdoor environment temperature is obtained, and the operation states of an indoor fan, a compressor and an outdoor fan are controlled according to the outdoor environment temperature; and when the air conditioner is in the heating operation mode, the indoor environment temperature is obtained, and the operation states of the outdoor fan, the compressor and the indoor fan are controlled according to the indoor environment temperature. According to the method, the high-pressure load of the air conditioner system can be reduced, so that the pressure in the pipeline during shutdown is reduced, the problems of pipeline fatigue fracture and compressor damage caused by pipeline stress exceeding due to sudden pipeline motion state change and stress surge occurring in the shutdown process of the air conditioner are solved, and the safety and reliability of the air conditioner are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and more particularly to an air conditioner and a control method thereof. Background Art

[0002] During the operation of an air conditioner, after the controller receives a shutdown instruction, the controller generally controls components such as the compressor and the fan to directly cut off the power supply. However, when the operating frequency of the compressor is relatively high, if the compressor suddenly stops running at this time, due to the sudden changes in the refrigerant pressure, flow velocity, and flow rate, as well as the inertial effect, the movement state of the pipeline will change suddenly, and the stress will surge, easily leading to an excessive pipeline stress, thereby causing pipeline fatigue fracture and compressor damage. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0004] To this end, an object of the present invention is to provide an air conditioner, which can reduce the high-pressure load of the air-conditioning system, thereby reducing the pressure in the pipeline during shutdown, avoiding sudden changes in the movement state of the pipeline and surging stress during the shutdown of the air conditioner, resulting in excessive pipeline stress, and further avoiding pipeline fatigue fracture and compressor damage, and improving the safety and reliability of the air conditioner.

[0005] To this end, a second object of the present invention is to provide a control method for an air conditioner.

[0006] To achieve the above object, an embodiment of the first aspect of the present invention provides an air conditioner, which includes: a refrigerant circulation circuit that enables the refrigerant to perform a refrigeration cycle in a circuit composed of a compressor, a condenser, and an evaporator, where 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, and the throttling component is used to limit or adjust the flow resistance of the refrigerant passing through it, and further limit or adjust the flow rate of the refrigerant passing through it; an indoor fan that drives indoor air to pass through the indoor heat exchanger by rotation, so that the refrigerant exchanges heat with the indoor air; an outdoor fan that drives outdoor air to pass through the outdoor heat exchanger by rotation, so that the refrigerant exchanges heat with the outdoor air; an outdoor temperature sensor that detects the outdoor ambient temperature; an indoor temperature sensor that detects the indoor ambient temperature; a controller, and the controller is configured to: when receiving a control instruction for instructing the air conditioner to stop, in response to the control instruction, obtain the operating mode of the air conditioner; when the air conditioner is in the cooling operating mode, obtain the outdoor ambient temperature, and control the operating states of the indoor fan, the compressor, and the outdoor fan according to the outdoor ambient temperature; when the air conditioner is in the heating operating mode, obtain the indoor ambient temperature, and control the operating states of the outdoor fan, the compressor, and the indoor fan according to the indoor ambient temperature.

[0007] According to the air conditioner of the embodiment of the present invention, when the air conditioner receives a stop instruction, in different operating modes, it can correspondingly control the indoor fan, the compressor, and the outdoor fan of the air conditioner according to the obtained outdoor ambient temperature, or control the outdoor fan, the compressor, and the indoor fan of the air conditioner according to the obtained indoor ambient temperature, reduce the high-pressure load of the air-conditioning system, thereby reducing the pressure in the pipeline during shutdown, avoiding sudden changes in the pipeline movement state and surges in stress during the shutdown of the air conditioner, resulting in pipeline stress exceeding the standard, and further resulting in pipeline fatigue fracture and compressor damage, and improving the safety and reliability of the air conditioner.

[0008] In some embodiments, the air conditioner further includes an outdoor heat exchanger coil temperature sensor for detecting the temperature of the outdoor heat exchanger coil. When controlling the operating states of the indoor fan, the compressor, and the outdoor fan according to the outdoor ambient temperature, the controller is configured to: when the outdoor ambient temperature reaches or exceeds a first preset temperature, control the indoor fan to stop running, and when controlling the compressor to decrease to a first preset frequency at a first target frequency reduction speed, control the compressor to stop running, and control the outdoor fan to stop running; when the outdoor ambient temperature reaches a second preset temperature and does not reach the first preset temperature, control the indoor fan to stop running, and when controlling the compressor to decrease to a second preset frequency at a second target frequency reduction speed, control the compressor to stop running, and control the outdoor fan to stop running; when the outdoor ambient temperature does not reach the second preset temperature, obtain the temperature of the outdoor heat exchanger coil, and control the operating states of the indoor fan, the compressor, and the outdoor fan according to the temperature of the outdoor heat exchanger coil.

[0009] In some embodiments, when controlling the operating states of the indoor fan, the compressor, and the outdoor fan according to the temperature of the outdoor heat exchanger coil, the controller is further configured to: when the temperature of the outdoor heat exchanger coil does not exceed a third preset temperature, control the indoor fan to run at the current speed, and when controlling the compressor to decrease to a third preset frequency at a third target frequency reduction speed, control the compressor and the indoor fan to stop running, and control the outdoor fan to stop running; when the temperature of the outdoor heat exchanger coil exceeds the third preset temperature, control the indoor fan to stop running, and when controlling the compressor to decrease to a fourth preset frequency at a fourth target frequency reduction speed, control the compressor to stop running, and control the outdoor fan to stop running, where the third preset temperature is greater than the second preset temperature and less than the first preset temperature.

[0010] In some embodiments, when controlling the operating states of the indoor fan, the compressor, and the outdoor fan according to the outdoor ambient temperature, the controller is further configured to: obtain the current operating frequency of the compressor; determine the first target frequency reduction speed according to the current operating frequency, the first preset frequency reduction time, and the first preset frequency; determine the second target frequency reduction speed according to the current operating frequency, the second preset frequency reduction time, and the second preset frequency; determine the third target frequency reduction speed according to the current operating frequency, the third preset frequency reduction time, and the third preset frequency; determine the fourth target frequency reduction speed according to the current operating frequency, the fourth preset frequency reduction time, and the fourth preset frequency, where the first frequency reduction time is greater than the second frequency reduction time, the second frequency reduction time is greater than the third frequency reduction time, and the fourth frequency reduction time is greater than or equal to the third frequency reduction time and less than the second frequency reduction time.

[0011] In some embodiments, when controlling the operating states of the outdoor fan, the compressor, and the indoor fan according to the indoor ambient temperature, the controller is configured to: when the indoor ambient temperature reaches or exceeds a fourth preset temperature, control the outdoor fan to stop operating, and when controlling the compressor to decrease to a fifth preset frequency at a fifth target frequency reduction speed, control the compressor to stop operating, and control the indoor fan to stop operating; when the indoor ambient temperature reaches a fifth preset temperature and does not reach the fourth preset temperature, control the outdoor fan to stop operating, and when controlling the compressor to decrease to a sixth preset frequency at a sixth target frequency reduction speed, control the compressor to stop operating, and control the indoor fan to stop operating; when the indoor ambient temperature does not reach the fifth preset temperature, obtain the indoor heat exchanger coil temperature, and control the operating states of the outdoor fan, the compressor, and the indoor fan according to the outdoor heat exchanger coil temperature.

[0012] In some embodiments, when controlling the operating states of the outdoor fan, the compressor, and the indoor fan according to the outdoor heat exchanger coil temperature, the controller is further configured to: when the outdoor heat exchanger coil temperature does not exceed a sixth preset temperature, control the outdoor fan to operate at the current rotational speed, and when controlling the compressor to decrease to a seventh preset frequency at a seventh target frequency reduction speed, control the compressor and the outdoor fan to stop operating, and control the indoor fan to stop operating; when the outdoor heat exchanger coil temperature exceeds the sixth preset temperature, control the outdoor fan to stop operating, and when controlling the compressor to decrease to an eighth preset frequency at an eighth target frequency reduction speed, control the compressor to stop operating, and control the indoor fan to stop operating, where the sixth preset temperature is greater than the fifth preset temperature and less than the fourth preset temperature.

[0013] In some embodiments, when controlling the operating states of the outdoor fan, the compressor, and the indoor fan according to the indoor ambient temperature, the controller is further configured to: obtain the current operating frequency of the compressor; determine the fifth target frequency reduction speed according to the current operating frequency, the fifth preset frequency reduction time, and the fifth preset frequency; determine the sixth target frequency reduction speed according to the current operating frequency, the sixth preset frequency reduction time, and the sixth preset frequency; determine the seventh target frequency reduction speed according to the current operating frequency, the seventh preset frequency reduction time, and the seventh preset frequency; determine the eighth target frequency reduction speed according to the current operating frequency, the eighth preset frequency reduction time, and the eighth preset frequency, where the fifth frequency reduction time is greater than the sixth frequency reduction time, the sixth frequency reduction time is greater than the seventh frequency reduction time, and the eighth frequency reduction time is greater than or equal to the seventh frequency reduction time and less than the sixth frequency reduction time.

[0014] In some embodiments, the throttling component includes a fixed throttling component configured to keep the flow resistance of the refrigerant passing through the fixed throttling component constant.

[0015] In some embodiments, the throttling component includes an electronic expansion valve. When the opening degree of the electronic expansion valve decreases, the flow resistance of the refrigerant passing through the electronic expansion valve increases; when the opening degree increases, the flow resistance of the refrigerant passing through the electronic expansion valve decreases. The controller is further configured to: in the refrigeration operation mode, when the outdoor ambient temperature reaches or exceeds a first preset temperature, control the electronic expansion valve to open to a first preset opening degree; otherwise, control the electronic expansion valve to open to a second preset opening degree, where the first preset opening degree is greater than the second preset opening degree. In the heating operation mode, when the indoor ambient temperature reaches or exceeds a fourth preset temperature, control the electronic expansion valve to open to a third preset opening degree; otherwise, control the electronic expansion valve to open to a fourth preset opening degree, where the third preset opening degree is greater than the fourth preset opening degree.

[0016] To achieve the above object, an embodiment of the second aspect of the present invention provides a control method for an air conditioner, the method including the following steps: when receiving a control instruction for instructing the air conditioner to stop, in response to the control instruction, obtain the operation mode of the air conditioner; when the air conditioner is in the refrigeration operation mode, obtain the outdoor ambient temperature, and control the operation states of the indoor fan, the compressor, and the outdoor fan according to the outdoor ambient temperature; when the air conditioner is in the heating operation mode, obtain the indoor ambient temperature, and control the operation states of the outdoor fan, the compressor, and the indoor fan according to the indoor ambient temperature.

[0017] According to the control method of the air conditioner in the embodiments of the present invention, when the air conditioner receives a stop instruction, in different operation modes, the indoor fan, the compressor, and the outdoor fan of the air conditioner can be correspondingly controlled according to the obtained outdoor ambient temperature, or the outdoor fan, the compressor, and the indoor fan of the air conditioner can be correspondingly controlled according to the obtained indoor ambient temperature, reducing the high-pressure load of the air-conditioning system, thereby reducing the pressure in the pipeline during shutdown, avoiding sudden changes in the pipeline movement state and sharp increases in stress during the shutdown of the air conditioner, which may lead to pipeline stress exceeding the standard, and further resulting in pipeline fatigue fracture and compressor damage, improving the safety and reliability of the air conditioner.

[0018] The additional aspects and advantages of the present invention will be partly given in the following description, partly will become obvious from the following description, or will be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the following description of embodiments in conjunction with the accompanying drawings, wherein:

[0020] Figure 1 is a schematic diagram of a refrigeration cycle system of an air conditioner according to an embodiment of the present invention;

[0021] Figure 2 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention;

[0022] Figure 3 is a schematic structural diagram of a controller according to an embodiment of the present invention;

[0023] Figure 4 is a schematic structural diagram of an air conditioner according to another embodiment of the present invention;

[0024] Figure 5 is a flowchart of a control method of an air conditioner according to an embodiment of the present invention;

[0025] Figure 6 is a schematic flow diagram of controlling the operating states of an indoor fan, a compressor, and an outdoor fan according to an outdoor ambient temperature according to an embodiment of the present invention;

[0026] Figure 7 is a schematic flow diagram of controlling the operating states of an outdoor fan, a compressor, and an indoor fan according to an outdoor heat exchanger coil temperature according to an embodiment of the present invention;

[0027] Figure 8 is a schematic flow diagram of controlling the operating states of an indoor fan, a compressor, and an outdoor fan according to an outdoor ambient temperature according to an embodiment of the present invention;

[0028] Figure 9 is a schematic flow diagram of controlling the operating states of an outdoor fan, a compressor, and an indoor fan according to an indoor ambient temperature according to an embodiment of the present invention;

[0029] Figure 10 is a schematic flow diagram of controlling the operating states of an outdoor fan, a compressor, and an indoor fan according to an outdoor heat exchanger coil temperature according to an embodiment of the present invention;

[0030] Figure 11 is a schematic flow diagram of controlling the operating states of an outdoor fan, a compressor, and an indoor fan according to an indoor ambient temperature according to an embodiment of the present invention. Detailed Embodiments

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0033] The terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

[0034] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0035] As Figure 1 shown, in the present invention, the air conditioner 1 performs a refrigeration cycle of the air conditioner 1 by using a compressor, a condenser, an evaporator and a four-way valve. The refrigeration cycle includes a series of processes, involving compression, condensation and evaporation, and supplying refrigerant to the air that has been conditioned and heat-exchanged.

[0036] The compressor compresses the refrigerant gas in a high-temperature and high-pressure state entering from the suction pipe and discharges the compressed refrigerant gas through the discharge pipe. The discharged refrigerant gas flows into the condenser from the condenser inlet pipe. The condenser condenses the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process.

[0037] The evaporator evaporates the refrigerant that expands in the expansion valve and returns the refrigerant gas in the low-temperature and low-pressure state to the compressor. The evaporator can achieve a refrigeration effect by using the latent heat of evaporation of the refrigerant to exchange heat with the material to be cooled. Throughout the cycle, the air conditioner 1 can adjust the temperature of the indoor space.

[0038] As Figure 2 shown, the air conditioner 1 in this application includes an indoor unit 11 and an outdoor unit 14. The indoor unit 11 and the outdoor unit 14 can be set as an integrated machine or a split machine. The indoor unit 11 can be set as a wall-mounted unit, a ceiling unit, a duct unit, etc., and the indoor unit 11 is installed on the top or upper part of the indoor room.

[0039] Taking the indoor wall-mounted unit as an example, the indoor wall-mounted unit is usually installed at positions such as the indoor wall surface. Again, for example, the indoor cabinet (not shown in the figure) is also a form of the indoor unit 11 of the indoor unit 11.

[0040] Taking the split machine as an example, the air conditioner 1 includes an indoor unit 11 and an outdoor unit 14. Among them, the outdoor unit 14 is usually set outdoors for heat exchange with the indoor environment.

[0041] In addition, the air conditioner 1 is equipped with a controller 71 (not shown in the figure) to control the operation of each component in the internal air conditioner 1 so that each component of the air conditioner 1 operates to achieve each predetermined function of the air conditioner 1. Among them, a control device 200 is also attached to the air conditioner 1. Exemplarily, the control device 200 is specifically set as a remote controller, and the remote controller has a function of communicating with the controller 71 using, for example, infrared rays or other communication methods. The remote controller is used for users to perform various controls on the air conditioner 1 to realize the interaction between the user and the air conditioner 1.

[0042] The indoor unit 11 of the air conditioner 1 in the embodiment of this application is set at the top or upper part of the indoor. Generally speaking, the installation height of the indoor unit 11 is higher than the user's activity area. The indoor unit 11 includes an air return opening 13 and an air outlet 12 communicating with the indoor. The indoor air passes through the air return opening 13 into the indoor unit 11 and flows back into the indoor through the air outlet 12.

[0043] At the position of the air outlet 12, a wind deflector 2 is provided. The wind deflector 2 adjusts the outflow direction of the air flowing through the air outlet 12 by changing its relative rotation angle with the air outlet 12, thereby affecting the stratification of the indoor air temperature.

[0044] The embodiment of this application also provides a schematic diagram of the hardware structure of a controller 71. As Figure 3 shown, the controller 71 includes a processor 83. Optionally, it further includes a memory 82 and a communication interface 84 connected to the processor 83. The processor 83, the memory 82, and the communication interface 84 are connected through a bus 81.

[0045] The processor 83 may be a central processing unit (CPU), a general-purpose processor 83, a network processor 83 (NP), a digital signal processor 83 (DSP), a microprocessor 83, a microcontroller 83, a programmable logic device (PLD), or any combination thereof. The processor 83 may also be any other device with processing capabilities, such as a circuit, a device, or a software module. The processor 83 may also include multiple CPUs, and the processor 83 may be a single-core (single CPU) processor 83 or a multi-core (multi CPU) processor 83. The processor 83 here may refer to one or more devices, circuits, or processing cores for processing data (such as computer program instructions).

[0046] The memory 82 may be a read-only memory 82 (ROM) or other types of static storage devices that can store static information and instructions, a random access memory 82 (RAM), or other types of dynamic storage devices that can store information and instructions. It may also be an electrically erasable programmable read-only memory 82 (EEPROM), a compact disc read-only memory (CDROM), or other optical disc storage, optical disc storage (including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), magnetic disk storage media, or any other magnetic storage device, or any other medium that can be used to carry or store the desired program code in the form of instructions or data structures and can be accessed by a computer. The embodiments of the present application do not impose any restrictions on this. The memory 82 may exist independently or may be integrated with the processor 83. Among them, 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 control method of the air conditioner 1 provided by the embodiments of the present application.

[0047] The communication interface 84 may 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 may be a module, a circuit, a transceiver, or any device capable of implementing communication.

[0048] The bus 81 can be a peripheral component interconnect (PCI) bus 81, an extended industry standard architecture (EISA) bus 81, or the like. The bus 81 can be divided into an address bus 81, a data bus 81, a control bus 81, and the like.

[0049] The following will describe Figures 4 - 11 the air conditioner 1 and its control method according to embodiments of the present invention.

[0050] In some embodiments, as Figure 4 shown, the air conditioner 1 includes: a refrigerant circulation circuit 10 that circulates refrigerant in a circuit composed of a compressor, a condenser, an evaporator, and a four-way valve.

[0051] In some embodiments, as Figure 4 shown, the air conditioner 1 may include: a throttling component 20 disposed between the condenser and the evaporator for restricting or regulating the flow resistance of the refrigerant passing through it, and thus restricting or regulating the flow rate of the refrigerant passing through it.

[0052] In some embodiments, as Figure 4 shown, the air conditioner 1 may include: an indoor fan 30 for driving indoor air to pass through an indoor heat exchanger by rotation, so that heat exchange occurs between the refrigerant and the indoor air.

[0053] In some embodiments, as Figure 4 shown, the air conditioner 1 may include: an outdoor fan 40 for driving outdoor air to pass through an outdoor heat exchanger by rotation, so that heat exchange occurs between the refrigerant and the outdoor air.

[0054] In some embodiments, as Figure 4 shown, the air conditioner 1 may include: an outdoor temperature sensor 50 for detecting the outdoor ambient temperature.

[0055] In some embodiments, as Figure 4 shown, the air conditioner 1 may include: an indoor temperature sensor 50 for detecting the indoor ambient temperature.

[0056] In some embodiments, as Figure 4 shown, the air conditioner 1 may include: a controller 71 configured to: when receiving a control instruction for instructing the air conditioner 1 to stop, in response to the control instruction, obtain the operating mode of the air conditioner 1;

[0057] When the air conditioner 1 is in the cooling operation mode, obtain the outdoor ambient temperature, and control the operating states of the indoor fan 30, the compressor, and the outdoor fan 40 according to the outdoor ambient temperature;

[0058] When the air conditioner 1 is in the heating operation mode, obtain the indoor ambient temperature, and control the operating states of the outdoor fan 40, the compressor, and the indoor fan 30 according to the indoor ambient temperature.

[0059] Specifically, during the operation of the air conditioner 1, when the controller 71 receives a control instruction for indicating shutdown, it can respond to the control instruction and obtain the current operation mode of the air conditioner 1, including the cooling mode and the heating mode.

[0060] Furthermore, when the air conditioner 1 is in the cooling operation mode, it indicates that the outdoor heat exchanger belongs to the high-temperature and high-pressure side, and can transfer the indoor heat to the outdoor to lower the indoor temperature. At this time, the outdoor ambient temperature has a great influence on the cooling efficiency and the air-conditioning system pressure. The outdoor temperature sensor 50 can be used to continuously monitor and obtain the outdoor ambient temperature in real time, and then control the operating states of the indoor fan 30, the compressor, and the outdoor fan 40 according to the outdoor ambient temperature, so as to reduce the impact of the high-pressure on the compressor and the pipeline during the shutdown process of the air conditioner 1, and avoid damage to the compressor and the pipeline.

[0061] Furthermore, when the air conditioner 1 is in the heating operation mode, it indicates that the indoor heat exchanger belongs to the high-temperature and high-pressure side, and can transfer the heat in the outdoor air to the indoor to raise the indoor temperature. At this time, the indoor ambient temperature has a great influence on the heating efficiency and the air-conditioning system pressure. The indoor temperature sensor 60 can be used to continuously monitor and obtain the indoor ambient temperature in real time, and then control the operating states of the outdoor fan 40, the compressor, and the indoor fan 30 according to the indoor ambient temperature, so as to reduce the impact of the high-pressure on the compressor and the pipeline during the shutdown process of the air conditioner 1, and avoid damage to the compressor and the pipeline.

[0062] According to the air conditioner 1 of the embodiment of the present invention, when the air conditioner 1 receives a shutdown instruction, in different operation modes, it can correspondingly control the indoor fan 30, the compressor, and the outdoor fan 40 of the air conditioner 1 according to the obtained outdoor ambient temperature, or control the outdoor fan 40, the compressor, and the indoor fan 30 of the air conditioner 1 according to the obtained indoor ambient temperature, reduce the high-pressure load of the air-conditioning system, thereby reducing the pressure in the pipeline during shutdown, and avoiding problems such as sudden changes in the pipeline movement state and surge in stress during the shutdown process of the air conditioner 1, resulting in pipeline stress exceeding the standard, and further leading to pipeline fatigue fracture and compressor damage, and improving the safety and reliability of the air conditioner 1.

[0063] In an embodiment of the present invention, the air conditioner 1 further includes an outdoor heat exchanger coil temperature sensor for detecting the temperature of the outdoor heat exchanger coil. When controlling the operating states of the indoor fan 30, the compressor, and the outdoor fan 40 according to the outdoor ambient temperature, the controller 71 is configured to:

[0064] When the outdoor ambient temperature reaches or exceeds the first preset temperature, control the indoor fan 30 to stop running, and when controlling the compressor to decrease to the first preset frequency at the first target frequency reduction speed, control the compressor to stop running, and control the outdoor fan 40 to stop running;

[0065] When the outdoor ambient temperature reaches the second preset temperature and does not reach the first preset temperature, control the indoor fan 30 to stop running, and when controlling the compressor to decrease to the second preset frequency at the second target frequency reduction speed, control the compressor to stop running, and control the outdoor fan 40 to stop running;

[0066] When the outdoor ambient temperature does not reach the second preset temperature, obtain the temperature of the outdoor heat exchanger coil, and control the operating states of the indoor fan 30, the compressor, and the outdoor fan 40 according to the temperature of the outdoor heat exchanger coil.

[0067] Specifically, when controlling the operating states of the indoor fan 30, the compressor, and the outdoor fan 40 according to the outdoor ambient temperature, if the outdoor ambient temperature reaches or exceeds the first preset temperature, it indicates that the current outdoor ambient temperature is relatively high, the air conditioner 1 faces a relatively high cooling load, the heat dissipation burden is relatively large, and the pressure on the high-temperature and high-pressure side of the refrigeration system of the air conditioner 1 is relatively large. At this time, the indoor fan 30 can be controlled to stop operating, so that the airflow passing through the outdoor heat exchanger rapidly decreases, thereby accelerating the condensation process, rapidly reducing the pressure on the high-temperature and high-pressure side, reducing the cooling load and heat dissipation burden of the air conditioner 1, and thus reducing the pressure of the air conditioning system; at the same time, the compressor can be controlled to gradually reduce its operating frequency at the preset first target frequency reduction speed until it is reduced to the preset operating frequency, that is, the first preset frequency, then control the compressor to stop running, and control the outdoor fan 40 to stop running, so as to ensure that the compressor can smoothly release the pressure of the air conditioning system during the shutdown process of the air conditioner 1, and avoid safety problems or energy waste caused by the continuous operation of the outdoor fan 40 when the air conditioner 1 shuts down safely and smoothly.

[0068] Further, if the outdoor ambient temperature reaches the second preset temperature but does not reach the first preset temperature, it indicates that under the current outdoor ambient temperature, the air conditioner 1 still faces a certain cooling load and heat dissipation burden, and the pressure on the high-temperature and high-pressure side of the refrigeration system of the air conditioner 1 is still relatively large. At this time, the indoor fan 30 can be controlled to stop operating, so that the airflow passing through the outdoor heat exchanger rapidly decreases, thereby accelerating the condensation process, rapidly reducing the pressure on the high-temperature and high-pressure side, reducing the cooling load and heat dissipation burden of the air conditioner 1, and thus reducing the pressure of the air conditioning system. At the same time, the compressor can be controlled to gradually reduce its operating frequency at a preset second target frequency reduction rate until it is reduced to the preset operating frequency, that is, the second preset frequency, then the compressor is controlled to stop, and the outdoor fan 40 is controlled to stop, so as to ensure that the compressor can smoothly release the pressure of the air conditioning system during the shutdown process of the air conditioner 1, and avoid safety problems or energy waste caused by the continuous operation of the outdoor fan 40 when the air conditioner 1 shuts down safely and smoothly.

[0069] Further, if the outdoor ambient temperature does not reach the second preset temperature, it indicates that the current outdoor ambient temperature is relatively low, and the cooling load of the air conditioner 1 is small, that is, the pressure on the high-temperature and high-pressure side of the refrigeration system of the air conditioner 1 is low. At this time, the temperature of the outdoor heat exchanger coil can be continuously monitored and obtained in real time through the outdoor heat exchanger coil temperature sensor, and then the operating states of the indoor fan 30, the compressor, and the outdoor fan 40 can be controlled according to the temperature of the outdoor heat exchanger coil, so as to avoid the risks of icing and liquid hammer of the outdoor heat exchanger caused by directly stopping the indoor fan 30.

[0070] In a specific embodiment, the first preset temperature, the second preset temperature, the first preset frequency, and the second preset frequency can all be set according to experimental tests or design theories. Among them, the first preset temperature can be 40 degrees, the second preset temperature can be 20 degrees, and both the first preset frequency and the second preset frequency can be 30 Hz.

[0071] In an embodiment of the present invention, when controlling the operating states of the indoor fan 30, the compressor, and the outdoor fan 40 according to the temperature of the outdoor heat exchanger coil, the controller 71 is further configured to:

[0072] When the temperature of the outdoor heat exchanger coil does not exceed the third preset temperature, control the indoor fan 30 to operate at the current speed, and control the compressor to be reduced to the third preset frequency at a third target frequency reduction rate, then control the compressor and the indoor fan 30 to stop, and control the outdoor fan 40 to stop;

[0073] When the temperature of the outdoor heat exchanger coil exceeds the third preset temperature, control the indoor fan 30 to stop, and control the compressor to be reduced to the fourth preset frequency at a fourth target frequency reduction rate, then control the compressor to stop, and control the outdoor fan 40 to stop, where the third preset temperature is greater than the second preset temperature and less than the first preset temperature.

[0074] Specifically, when controlling the operating states of the indoor fan 30, the compressor, and the outdoor fan 40 according to the temperature of the outdoor heat exchanger coil, if the temperature of the outdoor heat exchanger coil does not exceed the third preset temperature, it indicates that the heat dissipation efficiency of the air conditioner 1 is within an ideal range. The indoor fan 30 can be controlled to maintain its current rotational speed, so as to ensure that while the pressure on the high-temperature and high-pressure side of the refrigeration system of the air conditioner 1 is slowly decreasing, the indoor air circulation and heat exchange can be maintained, the indoor temperature can be kept stable, and the problems of evaporator icing and liquid hammer can be avoided. At the same time, the compressor can be controlled to gradually reduce its operating frequency according to the preset third target frequency reduction speed until it is reduced to the preset operating frequency, that is, when the third preset frequency is reached, the compressor and the indoor fan 30 are controlled to stop, and the outdoor fan 40 is controlled to stop, that is, all high-pressure loads (such as the indoor fan 30, the outdoor fan 40, and the compressor) of the refrigeration system of the air conditioner 1 are controlled to stop, so as to ensure that the compressor can smoothly release the pressure of the air conditioning system during the shutdown process of the air conditioner 1.

[0075] Furthermore, if the temperature of the outdoor heat exchanger coil exceeds the third preset temperature, it indicates that the heat dissipation effect of the outdoor heat exchanger is not good, and the air conditioner 1 has difficulties in heat dissipation or overheating on the high-pressure side. The air conditioner 1 faces a certain refrigeration load and heat dissipation burden, and the pressure on the high-temperature and high-pressure side of the refrigeration system of the air conditioner 1 is relatively large. At this time, there are no problems of evaporator icing and liquid hammer. The indoor fan 30 can be controlled to perform a shutdown operation, so that the air flow passing through the outdoor heat exchanger is quickly reduced, thereby accelerating the condensation process, quickly reducing the pressure on the high-temperature and high-pressure side, reducing the refrigeration load and heat dissipation burden of the air conditioner 1, and thus reducing the pressure of the air conditioning system. At the same time, the compressor can be controlled to gradually reduce its operating frequency according to the preset fourth target frequency reduction speed until it is reduced to the preset operating frequency, that is, when the fourth preset frequency is reached, the compressor is controlled to stop, and the outdoor fan 40 is controlled to stop, so as to ensure that the compressor can smoothly release the pressure of the air conditioning system during the shutdown process of the air conditioner 1 and avoid safety problems or energy waste caused by the continuous operation of the outdoor fan 40 when the air conditioner 1 is safely and smoothly shut down.

[0076] In a specific embodiment, the third preset temperature, the third preset frequency, and the fourth preset frequency can all be set according to experimental tests or design theories. Among them, the third preset temperature can be 30 degrees, and both the third preset frequency and the fourth preset frequency can be 30 Hz.

[0077] In an embodiment of the present invention, when controlling the operating states of the indoor fan 30, the compressor, and the outdoor fan 40 according to the outdoor ambient temperature, the controller 71 is further configured to:

[0078] Obtain the current operating frequency of the compressor; determine the first target frequency reduction speed according to the current operating frequency, the first preset frequency reduction time, and the first preset frequency; determine the second target frequency reduction speed according to the current operating frequency, the second preset frequency reduction time, and the second preset frequency; determine the third target frequency reduction speed according to the current operating frequency, the third preset frequency reduction time, and the third preset frequency; determine the fourth target frequency reduction speed according to the current operating frequency, the fourth preset frequency reduction time, and the fourth preset frequency, where the first frequency reduction time is greater than the second frequency reduction time, the second frequency reduction time is greater than the third frequency reduction time, and the fourth frequency reduction time is greater than or equal to the third frequency reduction time and less than the second frequency reduction time.

[0079] Specifically, when controlling the operating states of the indoor fan 30, the compressor, and the outdoor fan 40 according to the outdoor ambient temperature, the current operating frequency of the compressor can be obtained, and the target frequency reduction speed can be determined according to the current operating frequency, the preset frequency reduction time, and the preset frequency. For example, if the current operating frequency of the compressor is F, the first preset frequency reduction time is t1, and the first preset frequency is F1, then the first target frequency reduction speed V1 can be: V1 = (F - F1) / t1; similarly, if the current operating frequency of the compressor is F, the second preset frequency reduction time is t2, and the second preset frequency is F2, then the second target frequency reduction speed V2 can be V2 = (F - F2) / t2; if the current operating frequency of the compressor is F, the third preset frequency reduction time is t3, and the third preset frequency is F3, then the third target frequency reduction speed V3 can be V3 = (F - F3) / t3; if the current operating frequency of the compressor is F, the fourth preset frequency reduction time is t4, and the second preset frequency is F4, then the fourth target frequency reduction speed V4 can be V4 = (F - F4) / t4. It can be understood that in different outdoor temperature environments, the frequency reduction time and the frequency reduction speed of the compressor are different. For example, when the outdoor ambient temperature reaches or exceeds the first preset temperature, it indicates that the outdoor ambient temperature is relatively high at this time, and the pressure on the high-temperature and high-pressure side of the refrigeration system of the air conditioner 1 is relatively large. At this time, to avoid sudden changes in the pressure on the high-temperature and high-pressure side, the compressor can be controlled to reduce the frequency at a lower frequency reduction speed and a longer frequency reduction time to ensure that the air conditioner 1 can safely and stably enter the shutdown state.

[0080] In an embodiment of the present invention, when controlling the operating states of the outdoor fan 40, the compressor, and the indoor fan 30 according to the indoor ambient temperature, the controller 71 is configured to:

[0081] That is, when the air conditioner 1 is operating in the heating mode, when the indoor ambient temperature reaches or exceeds the fourth preset temperature, control the outdoor fan 40 to stop, and when controlling the compressor to reduce to the fifth preset frequency at the fifth target frequency reduction speed, control the compressor to stop, and control the indoor fan 30 to stop;

[0082] When the indoor ambient temperature reaches the fifth preset temperature and does not reach the fourth preset temperature, control the outdoor fan 40 to stop running, and when the compressor is controlled to decrease to the sixth preset frequency at the sixth target frequency reduction speed, control the compressor to stop running, and control the indoor fan 30 to stop running;

[0083] When the indoor ambient temperature does not reach the fifth preset temperature, obtain the temperature of the outdoor heat exchanger coil, and control the operating states of the outdoor fan 40, the compressor, and the indoor fan 30 according to the temperature of the outdoor heat exchanger coil.

[0084] Specifically, when controlling the operating states of the outdoor fan 40, the compressor, and the indoor fan 30 according to the indoor ambient temperature, if the indoor ambient temperature reaches or exceeds the fourth preset temperature, it indicates that the current indoor ambient temperature is relatively high, and the pressure for the outdoor fan 40 to suck in air for condensation heat exchange increases, that is, the pressure on the high-temperature and high-pressure side of the heating system of the air conditioner 1 is relatively large. At this time, the outdoor fan 40 can be controlled to stop running to reduce the condensation heat exchange capacity of the indoor heat exchanger, so that the pressure on the high-temperature and high-pressure side drops rapidly, thereby reducing the pressure of the air-conditioning system; at the same time, the compressor can be controlled to gradually reduce its operating frequency at the preset fifth target frequency reduction speed until it is reduced to the preset operating frequency, that is, the fifth preset frequency, then control the compressor to stop running, and control the indoor fan 30 to stop running, so as to ensure that the compressor can gently release the pressure of the air-conditioning system during the shutdown process of the air conditioner 1, and avoid safety problems or energy waste caused by the continuous operation of the indoor fan 30 when the air conditioner 1 shuts down safely and smoothly.

[0085] Furthermore, if the indoor ambient temperature reaches the fifth preset temperature and does not reach the fourth preset temperature, it indicates that under the current outdoor ambient temperature, the pressure for the outdoor fan 40 to suck in air for condensation heat exchange is still relatively large, that is, the pressure on the high-temperature and high-pressure side of the heating system of the air conditioner 1 is relatively large. At this time, the outdoor fan 40 can be controlled to stop running to reduce the condensation heat exchange capacity of the indoor heat exchanger, so that the pressure on the high-temperature and high-pressure side drops rapidly, thereby reducing the pressure of the air-conditioning system; at the same time, the compressor can be controlled to gradually reduce its operating frequency at the preset fifth target frequency reduction speed until it is reduced to the preset operating frequency, that is, the fifth preset frequency, then control the compressor to stop running, and control the indoor fan 30 to stop running, so as to ensure that the compressor can gently release the pressure of the air-conditioning system during the shutdown process of the air conditioner 1, and avoid safety problems or energy waste caused by the continuous operation of the indoor fan 30 when the air conditioner 1 shuts down safely and smoothly.

[0086] Further, if the indoor environmental temperature does not reach the fifth preset temperature, it indicates that the current indoor environmental temperature is relatively low, and the heating load of the air conditioner 1 is small, that is, the pressure on the high-temperature and high-pressure side of the heating system of the air conditioner 1 is low. At this time, the outdoor heat exchanger coil temperature sensor can be used to continuously monitor and obtain the outdoor heat exchanger coil temperature in real time, and then control the operating states of the indoor fan 30, the compressor, and the indoor fan 30 according to the outdoor heat exchanger coil temperature, so as to avoid the risks of condenser icing and liquid hammer caused by directly stopping the outdoor fan 40.

[0087] In a specific embodiment, the fourth preset temperature, the fifth preset temperature, the fifth preset frequency, and the sixth preset frequency can all be set according to experimental tests or design theories. Among them, the fourth preset temperature can be 25 degrees, the fifth preset temperature can be 15 degrees, and both the fifth preset frequency and the sixth preset frequency can be 30 Hz.

[0088] In an embodiment of the present invention, when controlling the operating states of the outdoor fan 40, the compressor, and the indoor fan 30 according to the outdoor heat exchanger coil temperature, the controller 71 is further configured to:

[0089] When the outdoor heat exchanger coil temperature does not exceed the sixth preset temperature, control the outdoor fan 40 to operate at the current speed, and when controlling the compressor to decrease to the seventh preset frequency at the seventh target frequency reduction speed, control the compressor and the outdoor fan 40 to stop, and control the indoor fan 30 to stop;

[0090] When the outdoor heat exchanger coil temperature exceeds the sixth preset temperature, control the outdoor fan 40 to stop, and when controlling the compressor to decrease to the eighth preset frequency at the eighth target frequency reduction speed, control the compressor to stop, and control the indoor fan 30 to stop, where the sixth preset temperature is greater than the fifth preset temperature and less than the fourth preset temperature.

[0091] Specifically, when controlling the operating states of the outdoor fan 40, the compressor, and the indoor fan 30 according to the outdoor heat exchanger coil temperature, if the outdoor heat exchanger coil temperature does not exceed the sixth preset temperature, it indicates that the evaporation efficiency of the air conditioner 1 is within an ideal range. The outdoor fan 40 can be controlled to operate at the current speed, so as to ensure that while the pressure on the high-temperature and high-pressure side of the heating system of the air conditioner 1 is slowly decreasing, the indoor air circulation and heat exchange can be maintained, the indoor temperature can be kept stable, and the problems of condenser icing and liquid hammer can be avoided. At the same time, the compressor can be controlled to gradually reduce its operating frequency at the preset seventh target frequency reduction speed until it is reduced to the preset operating frequency, that is, the seventh preset frequency, and then control the compressor and the outdoor fan 40 to stop, and control the indoor fan 30 to stop, so as to ensure that the compressor can slowly release the pressure of the air conditioning system during the shutdown process of the air conditioner 1.

[0092] Further, if the temperature of the outdoor heat exchanger coil exceeds the sixth preset temperature, it indicates that the evaporation effect of the outdoor heat exchanger is poor, and the pressure on the high-temperature and high-pressure side of the heating system of the air conditioner 1 is relatively high. At this time, there are no problems of condenser icing and liquid hammer. The outdoor fan 40 can be controlled to stop operating, so that the airflow passing through the outdoor heat exchanger rapidly decreases, thereby reducing the heat exchange of the outdoor heat exchanger and quickly decreasing the pressure on the high-temperature and high-pressure side, so as to reduce the pressure of the air-conditioning system. At the same time, the compressor can be controlled to gradually reduce its operating frequency at a preset eighth target frequency reduction speed until it is reduced to the preset operating frequency, that is, the eighth preset frequency. Then, the compressor is controlled to stop, and the indoor fan 30 is controlled to stop, so as to ensure that the compressor can smoothly release the pressure of the air-conditioning system during the shutdown process of the air conditioner 1 and avoid safety problems or energy waste caused by the continuous operation of the indoor fan 30 when the air conditioner 1 shuts down safely and smoothly.

[0093] In a specific embodiment, the sixth preset temperature, the seventh preset frequency, and the eighth preset frequency can all be set according to experimental tests or design theories. Among them, the sixth preset temperature can be 30 degrees, and the seventh preset frequency and the eighth preset frequency can both be 30 Hz.

[0094] In an embodiment of the present invention, when controlling the operating states of the outdoor fan 40, the compressor, and the indoor fan 30 according to the indoor environmental temperature, the controller 71 is further configured to: obtain the current operating frequency of the compressor; determine the fifth target frequency reduction speed according to the current operating frequency, the fifth preset frequency reduction time, and the fifth preset frequency; determine the sixth target frequency reduction speed according to the current operating frequency, the sixth preset frequency reduction time, and the sixth preset frequency; determine the seventh target frequency reduction speed according to the current operating frequency, the seventh preset frequency reduction time, and the seventh preset frequency; determine the eighth target frequency reduction speed according to the current operating frequency, the eighth preset frequency reduction time, and the eighth preset frequency, where the fifth frequency reduction time is greater than the sixth frequency reduction time, the sixth frequency reduction time is greater than the seventh frequency reduction time, and the eighth frequency reduction time is greater than or equal to the seventh frequency reduction time and less than the sixth frequency reduction time.

[0095] Specifically, when controlling the operating states of the indoor fan 30, the compressor, and the indoor fan 30 according to the outdoor ambient temperature, the current operating frequency of the compressor can be obtained, and the target frequency reduction speed can be determined based on the current operating frequency, the preset frequency reduction time, and the preset frequency. For example, if the current operating frequency of the compressor is F, the fifth preset frequency reduction time is t5, and the fifth preset frequency is F5, then the fifth target frequency reduction speed V5 can be: V5 = (F - F5) / t5; similarly, if the current operating frequency of the compressor is F, the sixth preset frequency reduction time is t6, and the sixth preset frequency is F6, then the sixth target frequency reduction speed V6 can be V6 = (F - F6) / t6; if the current operating frequency of the compressor is F, the seventh preset frequency reduction time is t7, and the seventh preset frequency is F7, then the seventh target frequency reduction speed V7 can be V7 = (F - F7) / t7; if the current operating frequency of the compressor is F, the eighth preset frequency reduction time is t8, and the eighth preset frequency is F8, then the eighth target frequency reduction speed V8 can be V8 = (F - F8) / t8. It can be understood that in different outdoor temperature environments, the frequency reduction time and speed of the compressor are different. For example, when the indoor ambient temperature reaches or exceeds the first preset temperature, it indicates that the indoor ambient temperature is relatively high at this time, and the pressure on the high-temperature and high-pressure side of the heating system of the air conditioner 1 is relatively large. At this time, to avoid sudden changes in the pressure on the high-temperature and high-pressure side, the compressor can be controlled to reduce the frequency at a lower frequency reduction speed and a longer frequency reduction time to ensure that the air conditioner 1 can safely and stably enter the shutdown state.

[0096] In an embodiment of the present invention, the throttling component 20 includes: a fixed throttling component 20, and the fixed throttling component 20 is used to keep the flow resistance of the refrigerant passing through the fixed throttling component 20 constant.

[0097] Specifically, the throttling component 20 includes a fixed throttling component 20, which is used to restrict the flow of the refrigerant and ensure that the flow rate of the refrigerant remains within a relatively stable range, that is, the flow resistance when the refrigerant passes through the fixed throttling component 20 is constant. For example, the fixed throttling component 20 can be a capillary tube. When the refrigerant passes through the capillary tube, its flow area is restricted, which helps to maintain the pressure balance of the air conditioning system.

[0098] In an embodiment of the present invention, the throttling component 20 includes: an electronic expansion valve, and the electronic expansion valve is used to increase the flow resistance of the refrigerant passing through the electronic expansion valve when its opening degree decreases, and decrease the flow resistance of the refrigerant passing through the electronic expansion valve when its opening degree increases;

[0099] The controller 71 is further configured to: in the refrigeration operation mode, when the outdoor ambient temperature reaches or exceeds the first preset temperature, control the electronic expansion valve to open to the first preset opening degree, otherwise, control the electronic expansion valve to open to the second preset opening degree, where the first preset opening degree is greater than the second preset opening degree;

[0100] In the heating operation mode, when the indoor ambient temperature reaches or exceeds the fourth preset temperature, the electronic expansion valve is controlled to open to the third preset opening degree; otherwise, the electronic expansion valve is controlled to open to the fourth preset opening degree, where the third preset opening degree is greater than the fourth preset opening degree.

[0101] Specifically, the throttling component 20 includes an electronic expansion valve, which is used to change the opening degree according to the control signal to adjust the flow rate of the refrigerant. When its opening degree decreases, the flow resistance of the refrigerant passing through the electronic expansion valve increases; when its opening degree increases, the flow resistance of the refrigerant passing through the electronic expansion valve decreases. Specifically, in the cooling operation mode, when the outdoor ambient temperature reaches or exceeds the first preset temperature, it indicates that the current outdoor ambient temperature is relatively high, the air conditioner 1 faces a relatively high cooling load, the heat dissipation burden is relatively large, and the pressure on the high-temperature and high-pressure side of the refrigeration system of the air conditioner 1 is relatively high. At this time, the electronic expansion valve can be controlled to open to the first preset opening degree to increase the refrigerant flow rate, so as to accelerate the condensation process while reducing the flow resistance of the refrigerant in the air-conditioning system, and then quickly reduce the pressure on the high-temperature and high-pressure side, reduce the cooling load and heat dissipation burden of the air conditioner 1, and further reduce the pressure of the air-conditioning system; otherwise, the electronic expansion valve can be controlled to open to the second preset opening degree to make the pressure on the high-temperature and high-pressure side drop smoothly while balancing the refrigerant flow rate, and then make the pressure of the air-conditioning system drop stably.

[0102] Furthermore, in the heating operation mode, when the indoor ambient temperature reaches or exceeds the fourth preset temperature, it indicates that the current indoor ambient temperature is relatively high, and the pressure on the high-temperature and high-pressure side of the heating system of the air conditioner 1 is relatively high. At this time, the electronic expansion valve can be controlled to open to the third preset opening degree to increase the refrigerant flow rate, reduce the flow resistance of the refrigerant in the air-conditioning system, so as to quickly reduce the pressure on the high-temperature and high-pressure side, and further reduce the pressure of the air-conditioning system; otherwise, the electronic expansion valve can be controlled to open to the fourth preset opening degree to make the pressure on the high-temperature and high-pressure side drop smoothly while balancing the refrigerant flow rate, and then make the pressure of the air-conditioning system drop stably.

[0103] In a specific embodiment, the first preset opening degree, the second preset opening degree, the third preset opening degree, and the fourth preset opening degree can be set according to experimental tests or design theories. Among them, the first preset opening degree and the second preset opening degree can be the maximum opening degree of the electronic expansion valve, and the third preset opening degree and the fourth preset opening degree can be 300 steps.

[0104] According to the air conditioner 1 of the embodiment of the present invention, when the air conditioner 1 receives a shutdown instruction, in different operating modes, it can correspondingly control the indoor fan 30, the compressor, and the outdoor fan 40 of the air conditioner 1 according to the obtained outdoor ambient temperature, or correspondingly control the outdoor fan 40, the compressor, and the indoor fan 30 of the air conditioner 1 according to the obtained indoor ambient temperature, reduce the high-pressure load of the air-conditioning system, thereby reducing the pressure in the pipeline during shutdown, and avoiding the sudden change of the pipeline motion state and the surge of stress during the shutdown of the air conditioner 1, resulting in the pipeline stress exceeding the standard, and further leading to pipeline fatigue fracture and compressor damage, and improving the safety and reliability of the air conditioner 1.

[0105] Further, when the pressure on the high-temperature and high-pressure side of the air conditioner 1 is relatively large, the opening degree of the electronic expansion valve can be controlled according to the obtained outdoor ambient temperature or the outdoor ambient temperature, so as to realize the control of the refrigerant flow rate, so as to reduce the pressure on the high-temperature and high-pressure side of the conditioner 1.

[0106] The following refers to Figure 5 Describe the control method of the air conditioner according to the embodiment of the present invention.

[0107] As Figure 5 shown, the control method of the air conditioner according to the embodiment of the present invention at least includes step S1-step S3.

[0108] Step S1, when receiving a control instruction for instructing the air conditioner to shut down, in response to the control instruction, obtain the operating mode of the air conditioner.

[0109] Step S2, when the air conditioner is in the cooling operation mode, obtain the outdoor ambient temperature, and control the operating states of the indoor fan, the compressor, and the outdoor fan according to the outdoor ambient temperature.

[0110] Step S3, when the air conditioner is in the heating operation mode, obtain the indoor ambient temperature, and control the operating states of the outdoor fan, the compressor, and the indoor fan according to the indoor ambient temperature.

[0111] In some embodiments, the air conditioner further includes an outdoor heat exchanger coil temperature sensor for detecting the temperature of the outdoor heat exchanger coil, as Figure 6As shown, when controlling the operating states of the indoor fan, the compressor, and the outdoor fan according to the outdoor ambient temperature, it specifically includes: when the outdoor ambient temperature reaches or exceeds the first preset temperature, controlling the indoor fan to stop running, and when controlling the compressor to decrease to the first preset frequency at the first target frequency reduction speed, controlling the compressor to stop running, and controlling the outdoor fan to stop running; when the outdoor ambient temperature reaches the second preset temperature and does not reach the first preset temperature, controlling the indoor fan to stop running, and when controlling the compressor to decrease to the second preset frequency at the second target frequency reduction speed, controlling the compressor to stop running, and controlling the outdoor fan to stop running; when the outdoor ambient temperature does not reach the second preset temperature, obtaining the temperature of the outdoor heat exchanger coil, and controlling the operating states of the outdoor fan, the compressor, and the indoor fan according to the temperature of the outdoor heat exchanger coil.

[0112] In some embodiments, as Figure 7 As shown, when controlling the operating states of the outdoor fan, the compressor, and the indoor fan according to the temperature of the outdoor heat exchanger coil, it specifically includes: when the temperature of the outdoor heat exchanger coil does not exceed the third preset temperature, controlling the indoor fan to run at the current speed, and when controlling the compressor to decrease to the third preset frequency at the third target frequency reduction speed, controlling the compressor and the indoor fan to stop running, and controlling the outdoor fan to stop running; when the temperature of the outdoor heat exchanger coil exceeds the third preset temperature, controlling the indoor fan to stop running, and when controlling the compressor to decrease to the fourth preset frequency at the fourth target frequency reduction speed, controlling the compressor to stop running, and controlling the outdoor fan to stop running, where the third preset temperature is greater than the second preset temperature and less than the first preset temperature.

[0113] In some embodiments, as Figure 8 As shown, when controlling the operating states of the indoor fan, the compressor, and the outdoor fan according to the outdoor ambient temperature, it specifically includes: obtaining the current operating frequency of the compressor; determining the first target frequency reduction speed according to the current operating frequency, the first preset frequency reduction time, and the first preset frequency; determining the second target frequency reduction speed according to the current operating frequency, the second preset frequency reduction time, and the second preset frequency; determining the third target frequency reduction speed according to the current operating frequency, the third preset frequency reduction time, and the third preset frequency; determining the fourth target frequency reduction speed according to the current operating frequency, the fourth preset frequency reduction time, and the fourth preset frequency, where the first frequency reduction time is greater than the second frequency reduction time, the second frequency reduction time is greater than the third frequency reduction time, and the fourth frequency reduction time is greater than or equal to the third frequency reduction time and less than the second frequency reduction time.

[0114] In some embodiments, as Figure 9As shown, when controlling the operating states of the outdoor fan, compressor, and indoor fan according to the indoor ambient temperature, it specifically includes: when the indoor ambient temperature reaches or exceeds the fourth preset temperature, controlling the outdoor fan to stop running, and when controlling the compressor to decrease to the fifth preset frequency at the fifth target frequency reduction speed, controlling the compressor to stop running, and controlling the indoor fan to stop running; when the indoor ambient temperature reaches the fifth preset temperature and does not reach the fourth preset temperature, controlling the outdoor fan to stop running, and when controlling the compressor to decrease to the sixth preset frequency at the sixth target frequency reduction speed, controlling the compressor to stop running, and controlling the indoor fan to stop running; when the indoor ambient temperature does not reach the fifth preset temperature, obtaining the temperature of the outdoor heat exchanger coil, and controlling the operating states of the outdoor fan, compressor, and indoor fan according to the temperature of the outdoor heat exchanger coil.

[0115] In some embodiments, as Figure 10 shown, when controlling the operating states of the outdoor fan, compressor, and indoor fan according to the temperature of the outdoor heat exchanger coil, it specifically includes: when the temperature of the outdoor heat exchanger coil does not exceed the sixth preset temperature, controlling the outdoor fan to run at the current speed, and when controlling the compressor to decrease to the seventh preset frequency at the seventh target frequency reduction speed, controlling the compressor and the outdoor fan to stop running, and controlling the indoor fan to stop running; when the temperature of the outdoor heat exchanger coil exceeds the sixth preset temperature, controlling the outdoor fan to stop running, and when controlling the compressor to decrease to the eighth preset frequency at the eighth target frequency reduction speed, controlling the compressor to stop running, and controlling the indoor fan to stop running, where the sixth preset temperature is greater than the fifth preset temperature and less than the fourth preset temperature.

[0116] In some embodiments, as Figure 11 shown, when controlling the operating states of the outdoor fan, compressor, and indoor fan according to the indoor ambient temperature, it specifically includes: obtaining the current operating frequency of the compressor; determining the fifth target frequency reduction speed according to the current operating frequency, the fifth preset frequency reduction time, and the fifth preset frequency; determining the sixth target frequency reduction speed according to the current operating frequency, the sixth preset frequency reduction time, and the sixth preset frequency; determining the seventh target frequency reduction speed according to the current operating frequency, the seventh preset frequency reduction time, and the seventh preset frequency; determining the eighth target frequency reduction speed according to the current operating frequency, the eighth preset frequency reduction time, and the eighth preset frequency, where the fifth frequency reduction time is greater than the sixth frequency reduction time, the sixth frequency reduction time is greater than the seventh frequency reduction time, and the eighth frequency reduction time is greater than or equal to the seventh frequency reduction time and less than the sixth frequency reduction time.

[0117] In some embodiments, the throttling component includes: a fixed throttling component, and the fixed throttling component is used to make the flow resistance of the refrigerant passing through the fixed throttling component constant.

[0118] In some embodiments, the throttling component includes an electronic expansion valve. When the opening degree of the electronic expansion valve decreases, the flow resistance of the refrigerant passing through the electronic expansion valve increases; when the opening degree increases, the flow resistance of the refrigerant passing through the electronic expansion valve decreases. Herein, the first preset opening degree is greater than the second preset opening degree. In the refrigeration operation mode, when the outdoor ambient temperature reaches or exceeds the first preset temperature, the electronic expansion valve is controlled to open to the first preset opening degree; otherwise, the electronic expansion valve is controlled to open to the second preset opening degree. In the heating operation mode, when the indoor ambient temperature reaches or exceeds the fourth preset temperature, the electronic expansion valve is controlled to open to the third preset opening degree; otherwise, the electronic expansion valve is controlled to open to the fourth preset opening degree. Herein, the third preset opening degree is greater than the fourth preset opening degree.

[0119] It should be noted that when controlling this air conditioner, the specific implementation manner is similar to that of the air conditioner in any one of the above embodiments of the present invention. Therefore, for a detailed exemplary description of the control process of this air conditioner, reference can be made to the relevant description part of the air conditioner mentioned above. To reduce redundancy, it will not be repeated here.

[0120] According to the control method of the air conditioner in the embodiment of the present invention, when the air conditioner 1 receives a shutdown instruction, in different operation modes, the indoor fan 30, the compressor, and the outdoor fan 40 of the air conditioner 1 can be correspondingly controlled according to the obtained outdoor ambient temperature, or the outdoor fan 40, the compressor, and the indoor fan 30 of the air conditioner 1 can be correspondingly controlled according to the obtained indoor ambient temperature, so as to reduce the high-pressure load of the air-conditioning system, thereby reducing the pressure in the pipeline during shutdown, avoiding sudden changes in the pipeline movement state and sharp increases in stress during the shutdown of the air conditioner 1, resulting in pipeline stress exceeding the standard, and further resulting in pipeline fatigue fracture and compressor damage, and improving the safety and reliability of the air conditioner 1.

[0121] Furthermore, in the case where the pressure on the high-temperature and high-pressure side of the air conditioner is relatively high, the opening degree of the electronic expansion valve can be controlled according to the obtained outdoor ambient temperature or the outdoor ambient temperature, so as to control the refrigerant flow rate, and facilitate reducing the pressure on the high-temperature and high-pressure side of the conditioner.

[0122] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example.

[0123] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. An air conditioner, characterized in that: include: A refrigerant circulation loop, wherein the refrigerant performs a refrigeration cycle in a loop consisting of a compressor, a condenser 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 is provided between the condenser and the evaporator; An indoor fan, used to drive the indoor air to pass through the indoor heat exchanger by rotating, so that the refrigerant and the indoor air can exchange heat; An outdoor fan is used to drive outdoor air to pass through the outdoor heat exchanger by rotating so that the refrigerant and the outdoor air can exchange heat; Outdoor temperature sensor, used to detect outdoor ambient temperature; Indoor temperature sensor, used to detect indoor ambient temperature; A controller, the controller being configured to: When receiving a control instruction for instructing the air conditioner to stop, acquiring the operation mode of the air conditioner in response to the control instruction; When the air conditioner is in a cooling operation mode, the outdoor ambient temperature is obtained, and the operation states of the indoor fan, the compressor and the outdoor fan are controlled according to the outdoor ambient temperature; When the air conditioner is in a heating operation mode, the indoor ambient temperature is acquired, and the operation states of the outdoor fan, the compressor, and the indoor fan are controlled according to the indoor ambient temperature.

2. The air conditioner according to claim 1, characterized in that: The air conditioner further includes an outdoor heat exchanger coil temperature sensor for detecting the outdoor heat exchanger coil temperature. When controlling the operating states of the indoor fan, the compressor and the outdoor fan according to the outdoor ambient temperature, the controller is configured as follows: When the outdoor ambient temperature reaches or exceeds a first preset temperature, the indoor fan is controlled to stop, and the compressor is controlled to reduce the frequency to a first preset frequency according to a first target frequency reduction speed, the compressor is controlled to stop, and the outdoor fan is controlled to stop; When the outdoor ambient temperature reaches a second preset temperature and does not reach the first preset temperature, the indoor fan is controlled to stop, and the compressor is controlled to reduce the frequency to a second preset frequency according to a second target frequency reduction speed, the compressor is controlled to stop, and the outdoor fan is controlled to stop; When the outdoor ambient temperature does not reach the second preset temperature, the outdoor heat exchanger coil temperature is obtained, and the operating states of the indoor fan, the compressor and the outdoor fan are controlled according to the outdoor heat exchanger coil temperature.

3. The air conditioner according to claim 2, characterized in that: When controlling the operating states of the indoor fan, the compressor and the outdoor fan according to the outdoor heat exchanger coil temperature, the controller is further configured to: When the temperature of the outdoor heat exchanger coil does not exceed the third preset temperature, the indoor fan is controlled to maintain the current speed, and the compressor is controlled to reduce the frequency to the third preset frequency according to the third target frequency reduction speed, the compressor and the indoor fan are controlled to stop, and the outdoor fan is controlled to stop; When the outdoor heat exchanger coil temperature exceeds a third preset temperature, the indoor fan is controlled to stop, and the compressor is controlled to reduce to a fourth preset frequency according to a fourth target frequency reduction speed, the compressor is controlled to stop, and the outdoor fan is controlled to stop, wherein the third preset temperature is greater than the second preset temperature and less than the first preset temperature.

4. The air conditioner according to claim 3, characterized in that: When controlling the operating states of the indoor fan, the compressor and the outdoor fan according to the outdoor ambient temperature, the controller is further configured to: Obtaining the current operating frequency of the compressor; Determine the first target frequency reduction speed according to the current operating frequency, the first preset frequency reduction time and the first preset frequency; Determine the second target frequency reduction speed according to the current operating frequency, the second preset frequency reduction time and the second preset frequency; Determine the third target frequency reduction speed according to the current operating frequency, the third preset frequency reduction time and the third preset frequency; The fourth target frequency reduction speed is determined according to the current operating frequency, the fourth preset frequency reduction time and the fourth preset frequency, wherein the first frequency reduction time is greater than the second frequency reduction time, the second frequency reduction time is greater than the third frequency reduction time, and the fourth frequency reduction time is greater than or equal to the third frequency reduction time and less than the second frequency reduction time.

5. The air conditioner according to claim 1, characterized in that: When controlling the operating states of the outdoor fan, the compressor, and the indoor fan according to the indoor ambient temperature, the controller is configured as follows: When the indoor ambient temperature reaches or exceeds a fourth preset temperature, the outdoor fan is controlled to stop, and the compressor is controlled to reduce the frequency to a fifth preset frequency according to a fifth target frequency reduction speed, the compressor is controlled to stop, and the indoor fan is controlled to stop; When the indoor ambient temperature reaches a fifth preset temperature and does not reach a fourth preset temperature, the outdoor fan is controlled to stop, and the compressor is controlled to reduce the frequency to a sixth preset frequency according to a sixth target frequency reduction speed, the compressor is controlled to stop, and the indoor fan is controlled to stop; When the indoor ambient temperature does not reach the fifth preset temperature, the outdoor heat exchanger coil temperature is acquired, and the operating states of the outdoor fan, the compressor, and the indoor fan are controlled according to the outdoor heat exchanger coil temperature.

6. The air conditioner according to claim 5, characterized in that: When controlling the operating states of the outdoor fan, the compressor and the indoor fan according to the outdoor heat exchanger coil temperature, the controller is further configured to: When the temperature of the outdoor heat exchanger coil does not exceed the sixth preset temperature, the outdoor fan is controlled to maintain the current speed, and the compressor is controlled to reduce the frequency to the seventh preset frequency according to the seventh target frequency reduction speed, the compressor and the outdoor fan are controlled to stop, and the indoor fan is controlled to stop; When the outdoor heat exchanger coil temperature exceeds the sixth preset temperature, the outdoor fan is controlled to stop, and the compressor is controlled to reduce to the eighth preset frequency according to the eighth target frequency reduction speed, the compressor is controlled to stop, and the indoor fan is controlled to stop, wherein the sixth preset temperature is greater than the fifth preset temperature and less than the fourth preset temperature.

7. The air conditioner according to claim 6, characterized in that: When controlling the operating states of the outdoor fan, the compressor and the indoor fan according to the indoor ambient temperature, the controller is further configured to: Obtaining the current operating frequency of the compressor; Determine the fifth target frequency reduction speed according to the current operating frequency, the fifth preset frequency reduction time and the fifth preset frequency; Determine the sixth target frequency reduction speed according to the current operating frequency, the sixth preset frequency reduction time and the sixth preset frequency; Determine the seventh target frequency reduction speed according to the current operating frequency, the seventh preset frequency reduction time and the seventh preset frequency; The eighth target frequency reduction speed is determined according to the current operating frequency, the eighth preset frequency reduction time and the eighth preset frequency, wherein the fifth frequency reduction time is greater than the sixth frequency reduction time, the sixth frequency reduction time is greater than the seventh frequency reduction time, and the eighth frequency reduction time is greater than or equal to the seventh frequency reduction time and less than the sixth frequency reduction time.

8. The air conditioner according to claim 1, characterized in that: The throttling component comprises: a fixed throttling component, The fixed throttling component is used to make the flow resistance of the refrigerant passing through the fixed throttling component constant.

9. The air conditioner according to claim 8, characterized in that: The throttling component comprises: An electronic expansion valve, wherein the electronic expansion valve is used to increase the flow resistance of the refrigerant passing through the electronic expansion valve when the opening degree of the electronic expansion valve is reduced, and to reduce the flow resistance of the refrigerant passing through the electronic expansion valve when the opening degree of the electronic expansion valve is increased; The controller is also configured to: In the cooling operation mode, when the outdoor ambient temperature reaches or exceeds a first preset temperature, the electronic expansion valve is controlled to open to a first preset opening degree, otherwise, the electronic expansion valve is controlled to open to a second preset opening degree, wherein the first preset opening degree is greater than the second preset opening degree; In the heating operation mode, when the indoor ambient temperature reaches or exceeds a fourth preset temperature, the electronic expansion valve is controlled to open to a third preset opening degree; otherwise, the electronic expansion valve is controlled to open to a fourth preset opening degree, wherein the third preset opening degree is greater than the fourth preset opening degree.

10. A method for controlling an air conditioner, characterized in that: For the air conditioner according to any one of claims 1 to 9, the control method comprises: When receiving a control instruction for instructing the air conditioner to stop, in response to the control instruction, acquiring an operation mode of the air conditioner; When the air conditioner is in a cooling operation mode, obtaining the outdoor ambient temperature, and controlling the operation states of the indoor fan, the compressor and the outdoor fan according to the outdoor ambient temperature; When the air conditioner is in a heating operation mode, the indoor ambient temperature is obtained, and the operation states of the outdoor fan, the compressor and the indoor fan are controlled according to the indoor ambient temperature.

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