Air conditioner

Abstract

The air conditioner comprises a storage and a controller, the storage is used for storing welding blockage fault information, and the welding blockage fault information is used for representing that welding blockage exists in a target coil pipe branch where an indoor coil pipe temperature sensor is located; the controller is configured to judge whether welding blockage fault information is stored in the storage or not when the air conditioner starts heating operation; if yes, welding blockage fault information is read, and if not, whether a welding blockage fault exists in the target coil pipe branch or not is judged; if yes, welding blockage fault information is obtained, and the welding blockage fault information is stored in a storage; after the welding blockage fault information is read or acquired, the rotating speed of the indoor motor is controlled based on the operation frequency of the compressor, the outdoor environment temperature and the exhaust inner ring temperature difference so as to carry out cold air prevention control, and / or waste heat blowing control is carried out based on the rotating speed and the operation time of the indoor motor, so that the accuracy of welding blockage fault detection is improved, and the working efficiency is improved. And the user experience is improved.

Description

Technical Field

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

[0002] During heating operation, the indoor heat exchanger is often divided into multiple branches due to the large refrigerant flow resistance, and the pipe temperature is monitored by the indoor coil temperature sensor to control the system pressure and the indoor fan speed during the cold wind protection period.

[0003] However, despite current preventative measures, indoor heat exchangers may still experience welding blockage. When a coil branch is welded, no refrigerant flows through the blocked branch, reducing the volume of the indoor heat exchanger and increasing the condensing temperature. Simultaneously, the temperature detected by the indoor coil temperature sensor is lower due to the welding blockage, triggering the cold wind protection mechanism. This causes the indoor fan speed to decrease, further increasing the condensing temperature and potentially generating noise, impacting the user experience. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems in the prior art. To this end, the object of the present invention is to provide an air conditioner.

[0005] The present invention provides an air conditioner, comprising: A refrigerant circulation loop, wherein the refrigerant undergoes a refrigeration cycle in a loop consisting of a compressor, a condenser, a throttling element, and an evaporator, wherein one of the condenser and the evaporator is an outdoor heat exchanger and the other is an indoor heat exchanger; Indoor temperature sensor, used to detect indoor ambient temperature; Indoor coil temperature sensor, used to detect indoor coil temperature; an exhaust temperature sensor, used to detect the exhaust temperature of the compressor; Outdoor ambient temperature sensor, used to detect outdoor ambient temperature; Outdoor coil temperature sensor, used to detect outdoor coil temperature; A memory, configured to store welding blockage fault information, wherein the welding blockage fault information is used to indicate that a welding blockage fault exists in the target coil branch where the indoor coil temperature sensor is located; A controller configured to: When the air conditioner is turned on for heating operation, determining whether the welding blockage fault information is stored in the memory; if so, reading the welding blockage fault information; if not, determining whether the target coil branch has a welding blockage fault; if so, obtaining the welding blockage fault information and storing the welding blockage fault information in the memory; after reading or obtaining the welding blockage fault information, controlling the speed of the indoor motor based on the compressor operating frequency, the outdoor ambient temperature, and the exhaust inner ring temperature difference to perform cold wind prevention control, and / or performing residual heat blowing control based on the speed and operating time of the indoor motor; The process of obtaining the welding blockage fault information includes: Control the air conditioner to start anti-cold wind control, and continuously detect the first operating parameter of the air conditioner at a first preset interval, and determine the second operating parameter based on the first operating parameter, wherein the first operating parameter includes: the indoor ambient temperature, the indoor coil temperature, the exhaust temperature, the outdoor ambient temperature, the outdoor coil temperature and the whole machine current; based on the first operating parameter and the second operating parameter, gradually judge whether the target coil branch has a welding blockage fault, if it is determined that the target coil branch has a welding blockage fault, gradually adjust the speed gear of the indoor motor, wherein the second operating parameter includes: indoor heat exchange temperature difference, exhaust superheat, outdoor heat exchange temperature difference and exhaust inner ring temperature difference; until the speed gear of the indoor motor is gradually adjusted from the stopped state to the first speed gear used to characterize high speed, if it is still determined that the target coil branch has a welding blockage fault, determine that the target coil branch has a welding blockage fault, and generate the welding blockage fault information.

[0006] In addition, the air conditioner according to the embodiment of the present invention may also have the following additional technical features: Furthermore, when gradually judging whether the target coil branch has a welding blockage fault based on the first operating parameter and the second operating parameter, and if it is judged that the target coil branch has a welding blockage fault, then gradually adjusting the speed gear of the indoor motor, the controller is configured to: control the compressor to operate from the first moment to the first target moment at the first preset interval, and then detect the first operating parameter and the second operating parameter; if all indoor heat exchange temperature differences from the first moment to the first target moment are less than or equal to the first preset indoor heat exchange temperature difference, and the exhaust inner ring temperature difference and the outdoor heat exchange temperature difference both show an increasing trend, and the exhaust inner ring temperature difference, the whole machine current and the outdoor heat exchange temperature difference detected at the first target moment are respectively greater than or equal to the first preset exhaust inner ring temperature difference, the first preset whole machine current and the first preset outdoor heat exchange temperature difference, then it is preliminarily judged that the target coil branch has a welding blockage fault, and the speed of the indoor motor is controlled to be adjusted from the stopped state to the second speed gear for characterizing low speed.

[0007] The above technical solution has the following advantages or beneficial effects: it can avoid the misjudgment caused by directly determining that the target coil branch has a welding blockage fault after determining that the target coil branch has a welding blockage fault in a stopped state, and further judge the welding blockage fault by adjusting the speed gear of the indoor motor, thereby improving the accuracy of the target coil branch welding blockage fault detection.

[0008] Furthermore, after controlling the speed of the indoor motor to adjust from a stopped state to a second speed gear for characterizing a low speed, the controller is configured to: control the compressor to operate from the first target moment to the second target moment at the first preset interval, and then detect the first operating parameter and the second operating parameter; if the indoor heat exchange temperature difference detected at the second target moment is less than or equal to the first preset indoor heat exchange temperature difference, and the exhaust inner ring temperature difference, the whole machine current and the outdoor heat exchange temperature difference detected at the second target moment are respectively greater than or equal to the first preset exhaust inner ring temperature difference, the first preset whole machine current and the first preset outdoor heat exchange temperature difference, then it is further determined that there is a welding blockage fault in the target coil branch, and the speed of the indoor motor is controlled to adjust from the second speed gear to a third speed gear for characterizing a medium speed.

[0009] The above technical solution has the following advantages or beneficial effects: it can avoid the misjudgment caused by directly determining that the target coil branch has a welding blockage fault after judging that the target coil branch has a welding blockage fault at a low speed. By adjusting the speed gear of the indoor motor to further judge the welding blockage fault, the accuracy of the target coil branch welding blockage fault detection can be improved.

[0010] Furthermore, after controlling the speed of the indoor motor to adjust from the second speed gear to the third speed gear for representing a medium speed, the controller is configured to: control the compressor to operate from the second target moment to the third target moment at the first preset interval, and then detect the first operating parameter and the second operating parameter; if the indoor heat exchange temperature difference detected at the third target moment is less than or equal to the first preset indoor heat exchange temperature difference, and the exhaust inner ring temperature difference, the whole machine current and the outdoor heat exchange temperature difference detected at the third target moment are respectively greater than or equal to the second preset exhaust inner ring temperature difference, the second preset whole machine current and the second preset outdoor heat exchange temperature difference, then it is determined that there is a welding blockage fault in the target coil branch, and the speed of the indoor motor is controlled to adjust from the third speed gear to the first speed gear.

[0011] The above technical solution has the following advantages or beneficial effects: it can avoid the misjudgment caused by directly determining that the target coil branch has a welding blockage fault after judging that the target coil branch has a welding blockage fault at a medium speed. By adjusting the speed gear of the indoor motor to further judge the welding blockage fault, the accuracy of the target coil branch welding blockage fault detection can be improved.

[0012] Furthermore, after controlling the speed of the indoor motor to adjust from the third speed gear to the first speed gear, the controller is configured to: control the compressor to operate from the third target moment to the fourth target moment at the first preset interval, and then detect the first operating parameter and the second operating parameter; if the indoor heat exchange temperature difference at the fourth target moment is less than or equal to the first preset indoor heat exchange temperature difference, and the exhaust inner ring temperature difference, the whole machine current and the outdoor heat exchange temperature difference detected at the fourth target moment are respectively greater than or equal to the third preset exhaust inner ring temperature difference, the third preset whole machine current and the third preset outdoor heat exchange temperature difference, then it is determined that there is a welding blockage fault in the target coil branch.

[0013] The above technical solution has the following advantages or beneficial effects: by repeatedly determining whether the target coil branch has a welding blockage fault and continuously adjusting the speed of the indoor motor to repeatedly verify that the target coil branch does have a welding blockage fault, misjudgment of the welding blockage fault detection can be avoided, and the accuracy of the welding blockage fault detection is improved.

[0014] Furthermore, after reading the welding blockage fault information or obtaining the welding blockage fault information, the controller is also configured to: when the whole machine current is greater than or equal to the fourth preset whole machine current, and / or the exhaust inner ring temperature difference is greater than or equal to the fourth preset exhaust inner ring temperature difference, control the speed gear of the indoor motor to be adjusted from the stop state to the second speed gear used to characterize low speed.

[0015] The above technical solution has the following advantages or beneficial effects: ensuring that users can still feel the appropriate temperature in the event of a welding blockage failure, avoiding direct blowing of cold wind, and improving user experience.

[0016] Furthermore, after controlling the speed gear of the indoor motor to adjust from a stopped state to a second speed gear for characterizing a low speed, the controller is configured to: when the whole machine current is greater than or equal to a fifth preset whole machine current, and / or the exhaust inner ring temperature difference is greater than or equal to the fifth preset exhaust inner ring temperature difference, control the speed of the indoor motor to adjust from the second speed gear to a third speed gear for characterizing a medium speed.

[0017] The above technical solution has the following advantages or beneficial effects: it can optimize the operating efficiency of the air conditioner and the comfort of the indoor environment.

[0018] Furthermore, after controlling the speed gear of the indoor motor to be adjusted from the second speed gear to the third speed gear for representing a medium speed, the controller is configured to: when the whole machine current is greater than or equal to the sixth preset whole machine current, and / or the exhaust inner ring temperature difference is greater than or equal to the sixth preset exhaust inner ring temperature difference, control the speed of the indoor motor to be adjusted from the third speed gear to the first speed gear.

[0019] The above technical solution has the following advantages or beneficial effects: it can optimize the operating efficiency of the air conditioner and the comfort of the indoor environment.

[0020] Furthermore, when controlling the speed of the indoor motor based on the compressor operating frequency, the outdoor ambient temperature and the exhaust inner ring temperature difference to perform anti-cold wind control, the controller is configured to: after controlling the indoor motor to operate according to the current set speed, obtain the compressor operating frequency, the outdoor ambient temperature and the exhaust inner ring temperature difference; when the operating frequency of the compressor is greater than the first operating frequency, and the outdoor ambient temperature is less than the first preset temperature, and the exhaust inner ring temperature difference is less than the seventh preset exhaust inner ring temperature difference, control the indoor motor to reduce the first preset speed from the current set speed, and continue to run for a second preset time until the minimum speed threshold for anti-cold wind operation is reached.

[0021] The above technical solution has the following advantages or beneficial effects: while ensuring that cold wind is prevented from blowing directly on the user, the speed of the indoor motor can be dynamically adjusted according to real-time operating parameters and user needs to achieve optimal comfort.

[0022] Furthermore, when performing waste heat blowing control based on the speed and running time of the indoor motor, the controller is configured to: when the waste heat blowing control condition is met, control the indoor motor to adjust from the first speed gear to the second speed gear and run continuously for a third preset time, and then control the indoor motor to stop running, wherein the waste heat blowing control condition includes: receiving a shutdown command and / or the compressor stopping running.

[0023] The above technical solution has the following advantages or beneficial effects: after ensuring that there is a welding blockage fault in the target coil branch, the air conditioner can be shut down in a safe and efficient manner while maintaining the comfort of the indoor environment as much as possible.

[0024] Furthermore, after determining that a welding blockage fault exists in the branch where the indoor coil temperature sensor is located, the controller is configured to control the air conditioner to no longer perform refrigerant leakage fault judgment in the heating mode.

[0025] The above technical solution has the following advantages or beneficial effects: avoiding misjudging a welding blockage fault as a refrigerant leakage fault, and improving the accuracy of welding blockage fault detection.

[0026] Furthermore, before the air conditioner starts heating operation, the controller is configured to: determine whether the indoor coil temperature sensor is faulty; if so, report the fault; and control the speed of the indoor motor based on the compressor operating frequency, the outdoor ambient temperature and the exhaust inner ring temperature difference to perform the cold wind prevention control, and / or based on the speed of the indoor motor and the operating time to perform the blowing waste heat control; if not, execute the step of reading the welding blockage fault information or obtaining the welding blockage fault information.

[0027] The above technical solution has the following advantages or beneficial effects: it can monitor and respond to possible welding blockage failures during the heating operation process, so as to ensure the smooth and safe operation of the heating process.

[0028] Furthermore, the indoor coil temperature sensor includes one or more. When there are multiple indoor coil temperature sensors, the multiple indoor coil temperature sensors are arranged in a one-to-one correspondence on multiple coil branches of the indoor heat exchanger.

[0029] The above technical solution has the following advantages or beneficial effects: it improves the accuracy of temperature measurement, helps to promptly detect and respond to potential welding blockage faults, and ensures efficient and stable operation of the air conditioner.

[0030] According to the air conditioner of the embodiment of the present invention, after the controller controls the air conditioner to start heating operation, it starts the cold wind prevention control, and continuously obtains the first operating parameter of the air conditioner at a first preset interval, calculates the second operating parameter based on the first operating parameter, and then gradually determines whether the target coil branch has a welding blockage fault based on the first operating parameter and the second operating parameter. When it is determined based on the operating parameters that the target coil branch has a welding blockage fault, the controller will gradually adjust the speed gear of the indoor motor until the speed gear of the indoor motor is adjusted from the stop state to the first speed gear. If it is still determined that the target coil branch has a welding blockage fault, it is determined that the target coil branch has a welding blockage fault. In this way, by repeatedly determining that the target coil branch has a welding blockage fault and continuously adjusting the speed of the indoor motor, it is verified multiple times that the target coil branch does have a welding blockage fault, which can avoid misjudgment of welding blockage fault detection and improve the accuracy of welding blockage fault detection.

[0031] The welding blockage fault information is then stored in the memory, and the characteristics of the memory can determine whether the welding blockage fault information can be directly read the next time the heating is started. If the current memory has an overwrite function, the welding blockage fault information can be directly read the next time the heating is turned on, saving fault detection time. If the overwrite function is not available, the welding blockage fault information is re-acquired based on the above steps after the heating is turned on. After determining that the target coil branch has a welding blockage fault, the speed of the indoor motor will be dynamically adjusted based on the compressor frequency, outdoor ambient temperature, and exhaust inner ring temperature difference to perform anti-cold wind control to ensure that the indoor temperature will not suddenly drop due to the welding blockage fault, causing the user to feel uncomfortable, and / or, the waste heat blowing control is performed according to the speed and running time of the indoor motor to further utilize the waste heat inside the system to improve heating efficiency, reduce energy waste, and ensure user comfort, while also ensuring that the air conditioner can operate normally and enhance user experience.

[0032] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments with reference to the following drawings, in which: Figure 1 is a structural diagram of an air conditioner according to an embodiment of the present invention; Figure 2 is a schematic structural diagram of a controller according to an embodiment of the present invention; Figure 3 is a structural diagram of an air conditioner according to another embodiment of the present invention; Figure 4 Schematic diagram of the relationship between the temperature of the indoor motor and the temperature of the indoor coil during the cold wind prevention stage of heating startup according to an embodiment of the present invention under normal conditions; Figure 5 Schematic diagram of the relationship between the temperature of the indoor motor and the temperature of the indoor coil during the cold wind prevention stage of heating startup under a welding blockage fault according to an embodiment of the present invention; Figure 6 2 is a schematic diagram showing the relationship between the temperature of the indoor motor and the temperature of the indoor coil during the cold wind prevention stage of the heating startup of the air conditioner according to another embodiment of the present invention under normal conditions; Figure 7 2 is a schematic diagram showing the relationship between the temperature of the indoor motor and the temperature of the indoor coil during the cold wind prevention stage of heating startup under a welding blockage fault according to another embodiment of the present invention; Figure 8 is a schematic diagram of the relationship between the indoor coil temperature, the exhaust temperature and the indoor ambient temperature according to one embodiment of the present invention; Figure 9is a schematic diagram of the relationship between the indoor coil temperature and the indoor ambient temperature according to one embodiment of the present invention; Figure 10 is a schematic diagram showing the relationship between the indoor coil temperature, the exhaust temperature, and the indoor ambient temperature under normal conditions according to one embodiment of the present invention; Figure 11 Schematic diagram of the relationship between indoor coil temperature, exhaust temperature and indoor ambient temperature under a welding blockage fault according to one embodiment of the present invention; Figure 12 is a flowchart of a method for controlling an air conditioner according to an embodiment of the present invention. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0036] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0037] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0038] The embodiment of the present invention provides an air conditioner 10, referring to Figure 1The air conditioner 10 includes a refrigeration system for exchanging heat with indoor air to meet cooling or heating needs.

[0039] The refrigeration system includes a compressor, a condenser, an electronic expansion valve, and an evaporator. In the present invention, the air conditioner 10 performs a refrigeration cycle of the air conditioner 10 by using the compressor, the condenser, the electronic expansion valve, and the 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.

[0040] The compressor compresses high-temperature, high-pressure refrigerant gas and discharges the compressed gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, releasing heat into the surrounding environment through the condensation process.

[0041] The electronic expansion valve expands the high-temperature, high-pressure liquid refrigerant condensed in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the refrigerant expanded in the electronic expansion valve and returns the low-temperature, low-pressure refrigerant gas to the compressor.

[0042] The evaporator can achieve a cooling effect by utilizing the latent heat of evaporation of the refrigerant to exchange heat with the material to be cooled. In the entire cycle, the air conditioner 10 can adjust the temperature of the indoor space.

[0043] The outdoor unit 2 of the air conditioner 10 refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger, the indoor unit 1 of the air conditioner 10 includes an indoor heat exchanger, and an electronic expansion valve may be provided in the indoor unit 1 or the outdoor unit 2 .

[0044] The indoor heat exchanger and the outdoor heat exchanger function as a condenser or an evaporator. When the indoor heat exchanger functions as a condenser, the air conditioner 10 functions as a heater in a heating mode, and when the indoor heat exchanger functions as an evaporator, the air conditioner 10 functions as a cooler in a cooling mode.

[0045] The air conditioner 10 of the present invention includes an indoor unit 1 and an outdoor unit 2. The indoor unit 1 and the outdoor unit 2 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 unit, a duct unit, etc., and the indoor unit 1 is installed at the top or ceiling of the indoor room.

[0046] Reference Figure 1 Taking an indoor hanging machine as an example, the indoor hanging machine is usually installed at a location such as an indoor wall. For another example, an indoor cabinet machine (not shown in the figure) is also a form of the indoor machine 1 .

[0047] Taking a split unit as an example, the air conditioner 10 includes an indoor unit 1 and an outdoor unit 2, wherein the outdoor unit 2 is usually set outdoors for heat exchange with the indoor environment.

[0048] Furthermore, as shown in the figure, the air conditioner 10 includes a controller 71 for controlling the operation of various components within the air conditioner 10, thereby enabling the various components of the air conditioner 10 to operate and realize various predetermined functions of the air conditioner 10. Furthermore, the air conditioner 10 is also provided with a control device 200. For example, the control device 200 is specifically configured as a remote control that is capable of communicating with the controller 71 using, for example, infrared or other communication methods. The remote control is used by the user to control the air conditioner 10 in various ways, thereby enabling interaction between the user and the air conditioner 10.

[0049] The indoor unit 1 of the air conditioner 10 in the embodiment of the present invention is arranged at the top or upper part of the room. Generally speaking, the installation height of the indoor unit 1 is higher than the user activity area. The indoor unit 1 includes a return air inlet and an air outlet connected to the room. The indoor air passes through the indoor unit 1 in the return air inlet and flows back to the room through the air outlet.

[0050] The refrigerant circulation circuit of the present invention circulates refrigerant through a loop consisting of a compressor, condenser, electronic expansion valve, and evaporator. One of the condenser and evaporator functions as an outdoor heat exchanger, while the other functions as an indoor heat exchanger. The indoor heat exchanger exchanges heat with the air in indoor unit 1, while the outdoor unit 2 heat exchanger exchanges heat with the air in outdoor unit 2, thereby achieving the cooling or heating requirements of air conditioner 10.

[0051] The indoor unit 1 also includes an indoor fan, which is arranged near the return air port or the air outlet of the indoor heat exchanger and is used to deliver the heat-exchanged air into the room. The indoor fan includes multiple gears for changing the outlet air flow speed of the outlet.

[0052] An air guide plate is provided at the position of the air outlet. The air guide plate adjusts the outflow direction of the air flowing through the air outlet by changing the relative rotation angle between the air guide plate and the air outlet, thereby affecting the indoor air temperature stratification.

[0053] In the illustrated embodiment of the present invention, the air conditioner 10 further includes a controller 71. Controller 71 is a device that generates an operation control signal based on an instruction opcode and a timing signal, thereby instructing the air conditioner 10 to execute the control instruction. For example, in response to a power-on or power-off instruction received from a user, controller 71 may execute an operation associated with the object selected by the power-on or power-off instruction.

[0054] The embodiment of the present invention also provides a hardware structure diagram of a controller 71, as shown in FIG. Figure 2 As shown, the controller 71 includes a processor 83 and, optionally, a memory 82 and a communication interface 84 connected to the processor 83. The processor 83, the memory 82 and the communication interface 84 are connected via a bus 81.

[0055] The processor 83 may be a central processing unit (CPU), a general-purpose processor (GP3), a network processor (NP), a digital signal processor (DSP), a microprocessor (MCU), a microcontroller (MCU), a programmable logic device (PLD), or any combination thereof. The processor 83 may also be any other device having processing functionality, such as a circuit, a device, or a software module. The processor 83 may also include multiple CPUs, and the processor 83 may be a single-CPU processor or a multi-CPU processor. The processor 83 herein may refer to one or more devices, circuits, or processing cores for processing data (e.g., computer program instructions).

[0056] The memory 82 can be a read-only memory 82 (ROM) or other type of static storage device that can store static information and instructions, a random access memory 82 (RAM) or other type of dynamic storage device that can store information and instructions, or an electrically erasable programmable read-only memory 82 (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed optical disc, laser disc, optical disc, digital versatile disc, Blu-ray disc, etc.), a magnetic disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and can be accessed by a computer. The embodiment of the present invention does not impose any restrictions on this. The memory 82 can exist independently or be integrated with the processor 83. The memory 82 can contain computer program code. The processor 83 is used to execute the computer program code stored in the memory 82, thereby implementing the air conditioner control method provided in the embodiment of the present invention.

[0057] The communication interface 84 can be used to communicate with other devices or communication networks (such as Ethernet, radio access network (RAN), wireless local area network (WLAN), etc.). The communication interface 84 can be a module, a circuit, a transceiver or any device that can achieve communication.

[0058] The bus 81 may be a peripheral component interconnect (PCI) bus 81 or an extended industry standard architecture (EISA) bus 81. The bus 81 may be divided into an address bus 81, a data bus 81, a control bus 81, etc. For ease of representation, Figure 2 Only one thick line is used in the figure, but it does not mean that there is only one bus 81 or one type of bus 81.

[0059] Reference below Figure 3-Figure 12 An air conditioner according to an embodiment of the present invention is described.

[0060] Figure 3 FIG. 1 is a schematic diagram of the structure of an air conditioner according to an embodiment of the present invention. Figure 3 As shown, an air conditioner 10 includes: a refrigerant circulation loop 11, an indoor ambient temperature sensor 12, an indoor coil temperature sensor 13, an exhaust temperature sensor 14, an outdoor ambient temperature sensor 15, an outdoor coil temperature sensor 16, a memory 17 and a controller 71.

[0061] Among them, the refrigerant circulation loop 11 allows the refrigerant to perform a refrigeration cycle in the loop composed of a compressor, a condenser, a throttling element, and an evaporator. One of the condenser and the evaporator is an outdoor heat exchanger, and the other is an indoor heat exchanger; the indoor ambient temperature sensor 12 is used to detect the indoor ambient temperature; the indoor coil temperature sensor 13 is used to detect the indoor coil temperature; the exhaust temperature sensor 14 is used to detect the exhaust temperature of the compressor; the outdoor ambient temperature sensor 15 is used to detect the outdoor ambient temperature; the outdoor coil temperature sensor 16 is used to detect the outdoor coil temperature; the memory 17 is used to store welding blockage fault information, and the welding blockage fault information is used to indicate that there is welding blockage in the target coil branch where the indoor coil temperature sensor is located.

[0062] The controller 71 is configured to: when the air conditioner 10 is turned on for heating operation, determine whether welding blockage fault information is stored in the memory 17; if so, read the welding blockage fault information; if not, determine whether there is a welding blockage fault in the target coil branch; if so, obtain the welding blockage fault information and store the welding blockage fault information in the memory 17; after reading the welding blockage fault information or obtaining the welding blockage fault information, control the speed of the indoor motor based on the compressor operating frequency, the outdoor ambient temperature and the exhaust inner ring temperature difference to perform cold wind prevention control, and / or perform waste heat blowing control based on the speed and operating time of the indoor motor.

[0063] Among them, the process of obtaining welding blockage fault information includes: controlling the air conditioner 10 to start the anti-cold wind control, and continuously detecting the first operating parameter of the air conditioner 10 at a first preset interval, and determining the second operating parameter based on the first operating parameter, wherein the first operating parameter includes: indoor ambient temperature, indoor coil temperature, exhaust temperature, outdoor ambient temperature, outdoor coil temperature and whole machine current; according to the first operating parameter and the second operating parameter, gradually judging whether the target coil branch has a welding blockage fault, if it is determined that the target coil branch has a welding blockage fault, then gradually adjusting the speed gear of the indoor motor, wherein the second operating parameter includes: indoor heat exchange temperature difference, exhaust superheat, outdoor heat exchange temperature difference and exhaust inner ring temperature difference; until the speed gear of the indoor motor is gradually adjusted from the stopped state to the first speed gear used to characterize high speed, if it is still determined that the target coil branch has a welding blockage fault, then determining that the target coil branch has a welding blockage fault, and generating welding blockage fault information.

[0064] Among them, the throttling element includes, for example, an expansion valve, a capillary tube, or a throttle valve; the memory 17 includes, for example, a memory with a rewrite function and a memory without a rewrite function, and the memory with a rewrite function is, for example, an EEPROM memory (Electrically Erasable Programmable Read Only Memory).

[0065] For example, the indoor ambient temperature is recorded as Tin, the indoor coil temperature is recorded as Tc, the exhaust temperature is recorded as Td, the outdoor ambient temperature is recorded as Tout, the outdoor coil temperature is recorded as Te, the whole machine current is recorded as Ih, the indoor heat exchange temperature difference is recorded as △Tin, the exhaust superheat is recorded as DSH, the outdoor heat exchange temperature difference is recorded as △Tout and the exhaust inner ring temperature difference is recorded as D_Tin.

[0066] In an embodiment, when the air conditioner 10 starts heating operation, it will first determine whether welding blockage fault information is stored in the memory 17. If welding blockage fault information is stored in the memory 17, the welding blockage fault information will be directly read. If welding blockage fault information is not stored in the memory 17, it will be determined whether there is a welding blockage fault in the target coil branch. If, based on the judgment result, it is determined that there is a welding blockage fault in the target coil branch, the controller 71 will obtain the welding blockage fault information and store the welding blockage fault information in the memory 17.

[0067] Specifically, the controller 71 controls the air conditioner 10 to start the anti-cold wind control, and continuously detects the first operating parameters of the air conditioner at a first preset interval, where the first preset interval is, for example, 10s, that is, the indoor ambient temperature Tin, indoor coil temperature Tc, exhaust temperature Td, outdoor ambient temperature Tout, outdoor coil temperature Te and whole machine current Ih are obtained every 10s. Based on the obtained first operating parameters, the second operating parameters can be calculated.

[0068] In a specific embodiment, the indoor heat exchange temperature difference ΔTin is the difference between the indoor coil temperature Tc and the indoor ambient temperature Tin, that is, ΔTin=Tc-Tin; the exhaust superheat DSH is the difference between the exhaust temperature Td and the indoor coil temperature Tc, that is, DSH=Td-Tc; the outdoor heat exchange temperature difference ΔTout is the difference between the outdoor ambient temperature Tout and the outdoor coil temperature Te, that is, ΔTout=Tout-Te; and the exhaust inner ring temperature D_Tin is the difference between the exhaust temperature Td and the indoor ambient temperature Tin, that is, D_Tin=Td-Tin.

[0069] After calculating and obtaining the second operating parameter, combined with the first operating parameter, it is gradually determined whether the target coil branch has a welding blockage fault. If the indoor motor is in a shutdown state and it is determined that the target coil branch has a welding blockage fault, then it is preliminarily determined that the target coil branch has a welding blockage fault, that is, it is suspected that the target coil branch has a welding blockage fault. Therefore, the controller 71 will adjust the speed gear of the indoor motor, and continuously adjust the speed gear of the indoor motor from the shutdown state to the first speed gear, wherein the first speed gear is a gear used to indicate that the indoor motor is currently in a high speed. If it is still determined that the target coil branch has a welding blockage fault, then it is determined that the target coil branch has a welding blockage fault, and welding blockage fault information is generated. In this way, by repeatedly determining that the target coil branch has a welding blockage fault and continuously adjusting the speed of the indoor motor, it is verified that the target coil branch does have a welding blockage fault multiple times, thereby avoiding misjudgment of welding blockage fault detection and improving the accuracy of welding blockage fault detection.

[0070] If the current memory has a rewriting function, the welding plugging fault information is stored in the memory 17. If the current memory 17 does not have a storage function, the welding plugging fault information is acquired again according to the above steps when the welding plugging fault information is acquired next time.

[0071] After determining that there is a welding blockage fault in the target coil branch, the speed of the indoor motor will be controlled based on the compressor frequency, the outdoor ambient temperature Tout and the exhaust inner ring temperature difference D_Tin, so as to perform anti-cold wind control to ensure that the indoor temperature will not drop suddenly due to the welding blockage fault, making the user feel uncomfortable, and / or, the waste heat blowing control is performed according to the speed and running time of the indoor motor to further utilize the waste heat inside the system to improve the heating efficiency, reduce energy waste, and ensure user comfort, while also ensuring that the air conditioner 10 can operate normally.

[0072] In one embodiment of the present invention, when gradually judging whether a target coil branch has a welding blockage fault based on a first operating parameter and a second operating parameter, and if it is judged that a welding blockage fault exists in the target coil branch, gradually adjusting the speed gear of the indoor motor, the controller 71 is configured to: control the compressor to operate from a first moment to a first target moment at a first preset interval, and then detect the first operating parameter and the second operating parameter; if all indoor heat exchange temperature differences from the first moment to the first target moment are less than or equal to the first preset indoor heat exchange temperature difference, and the exhaust inner ring temperature difference, the outdoor heat exchange temperature difference and the whole machine current all show an increasing trend, and the exhaust inner ring temperature difference, the whole machine current and the outdoor heat exchange temperature difference detected at the first target moment are respectively greater than or equal to the first preset exhaust inner ring temperature difference, the first preset whole machine current and the first preset outdoor heat exchange temperature difference, then it is preliminarily judged that a welding blockage fault exists in the target coil branch, and the speed of the indoor motor is controlled to be adjusted from a stopped state to a second speed gear for characterizing a low speed.

[0073] For example, the first preset indoor heat exchange temperature difference is recorded as △Tin1, the first preset exhaust inner ring temperature difference is recorded as D_Tin1, the first preset whole machine current is recorded as Ih1 and the first preset outdoor heat exchange temperature difference is recorded as △Tout1, the first time is recorded as t0, and the first target time is recorded as t(j).

[0074] In the embodiment, when the air conditioner 10 is in heating operation, if the set temperature is 23°C, the indoor motor is in a stopped state and the compressor is started. The control 71 records the indoor heat exchange temperature difference of the compressor at the first moment t0 (i.e., the start moment of the compressor) and records it as △Tin(0), and then records the first operating parameter and the second operating parameter every 10 seconds, and records the indoor ambient temperature detected within the first 10 seconds as Tin(1), the indoor coil temperature as Tc(1), the exhaust temperature as Td(1), the outdoor ambient temperature as Tout(1), the outdoor coil temperature as Te(1), the whole machine current as Ih(1), the indoor heat exchange temperature difference △Tin(1), the exhaust superheat DSH(1), the outdoor heat exchange temperature difference △Tout(1) and the exhaust inner ring temperature difference D_Tin(1).

[0075] Then, the first operating parameter and the second operating parameter are obtained at intervals of 10 seconds, and the indoor ambient temperature detected within the second 10 seconds is recorded as Tin(2), the indoor coil temperature is recorded as Tc(2), the exhaust temperature is recorded as Td(2), the outdoor ambient temperature is recorded as Tout(2), the outdoor coil temperature is recorded as Te(2), the whole machine current is recorded as Ih(2), the indoor heat exchange temperature difference △Tin(2), the exhaust superheat DSH(2), the outdoor heat exchange temperature difference △Tout(2) and the exhaust inner ring temperature difference D_Tin(2).

[0076] After that, the first operating parameter and the second operating parameter are detected every 10 seconds until the first target time t(j), and the first operating parameter and the second operating parameter at the first target time t(j) are obtained. The indoor ambient temperature detected at the first target time t(j) is recorded as Tin(j), the indoor coil temperature is recorded as Tc(j), the exhaust temperature is recorded as Td(j), the outdoor ambient temperature is recorded as Tout(j), the outdoor coil temperature is recorded as Te(j), the whole machine current is recorded as Ih(j), the indoor heat exchange temperature difference △Tin(j), the exhaust superheat DSH(j), the outdoor heat exchange temperature difference △Tout(j) and the exhaust inner ring temperature difference D_Tin(j).

[0077] If all indoor heat exchange temperature differences △Tin detected from the first moment to the first target moment are less than or equal to the first preset indoor heat exchange temperature difference, i.e., △Tin(0), △Tin(1), △Tin(2), ... △Tin(j) △Tin1, and the exhaust inner ring temperature difference D_Tin, the outdoor heat exchange temperature difference △Tout and the whole machine current Ih all show an increasing trend, that is, D_Tin(1), D_Tin(2), ...D_Tin(j) and △Tout(1), △Tout(2), ...△Tout(j) and Ih(1), Ih(2), ...Ih(j) all show an increasing trend, and the exhaust inner ring temperature difference D_Tin(j) detected at the first target time t(j) is greater than or equal to the first preset exhaust inner ring temperature difference D_Tin1, that is, D_Tin(j) D_Tin1; the whole machine current Ih(j) detected at the first target time t(j) is greater than or equal to the first preset whole machine current Ih1, i.e. Ih(j) Ih1; and the outdoor heat exchange temperature difference △Tout(j) detected at the first target time t(j) is greater than the first preset outdoor heat exchange temperature difference △Tout1, ie △Tout(j) △Tout1.

[0078] When the first operating parameter and the second operating parameter meet the above conditions, it can be preliminarily determined that there is a welding blockage fault in the target coil branch, that is, it is determined that the target coil branch is suspected of being welded and blocked, and the controller 71 controls the speed of the indoor motor to adjust from the stopped state to the second speed gear, that is, the speed of the indoor motor is increased from the stopped state to a low speed. This can avoid the misjudgment caused by directly determining that there is a welding blockage fault in the target coil branch after it is determined that there is a welding blockage fault in the stopped state. By adjusting the speed gear of the indoor motor to further perform welding blockage fault judgment, the accuracy of target coil branch welding blockage fault detection can be improved.

[0079] In one embodiment of the present invention, after controlling the speed of the indoor motor to be adjusted from a stopped state to a second speed gear for characterizing a low speed, the controller 71 is configured to: control the compressor to operate from a first target time t(j) to a second target time at a first preset interval, and then detect the first operating parameter and the second operating parameter; if the indoor heat exchange temperature difference detected at the second target time is less than or equal to the first preset indoor heat exchange temperature difference, and the exhaust inner ring temperature difference, the whole machine current and the outdoor heat exchange temperature difference detected at the second target time are respectively greater than or equal to the first preset exhaust inner ring temperature difference, the first preset whole machine current and the first preset outdoor heat exchange temperature difference, then it is further determined that there is a welding blockage fault in the target coil branch, and the speed of the indoor motor is controlled to be adjusted from the second speed gear to the third speed gear for characterizing a medium speed.

[0080] In an embodiment, after the controller 71 controls the speed gear of the indoor motor to be adjusted to the second speed gear, it runs at a low speed for a period of time, for example, k, where k includes multiple first preset intervals, so that the indoor motor runs from the first target time t(j) to the second target time, and the second target time is recorded as t(j+k).

[0081] At this time, the controller 71 detects the first operating parameter and the second operating parameter at the second target time t(j+k). If the indoor heat exchange temperature difference detected at the second target time t(j+k) (e.g., ΔTin(j+k)) is less than or equal to the first preset indoor heat exchange temperature difference ΔTin1, that is, ΔTin(j+k) △Tin1, and the exhaust inner ring temperature difference detected at the second target time t(j+k) (for example, recorded as D_Tin(j+k)) is greater than or equal to the first preset exhaust inner ring temperature difference D_Tin1, that is, D_Tin(j+k) D_Tin1; the whole machine current Ih(j+k) detected at the second target time t(j+k) is greater than or equal to the first preset whole machine current Ih1, that is, Ih(j+k) Ih1; and the outdoor heat exchange temperature difference △Tout(j+k) detected at the second target time t(j+k) is greater than the first preset outdoor heat exchange temperature difference △Tout1, ie △Tout(j+k) △Tout1.

[0082] When the first operating parameter and the second operating parameter meet the above conditions, it can be further determined that the target coil branch has a welding blockage fault, that is, it is determined that the target coil branch is suspected of being welded and blocked, and the controller 71 controls the speed of the indoor motor to adjust from the second speed to the third speed gear, that is, to increase the speed of the indoor motor from a low speed to a medium speed. This can avoid the misjudgment caused by directly determining that the target coil branch has a welding blockage fault after the target coil branch is determined to have a welding blockage fault at a low speed. By adjusting the speed gear of the indoor motor to further perform welding blockage fault judgment, the accuracy of target coil branch welding blockage fault detection can be improved.

[0083] In one embodiment of the present invention, after controlling the speed of the indoor motor to be adjusted from the second speed gear to the third speed gear for representing a medium speed, the controller 71 is configured to: control the compressor to operate from the second target moment to the third target moment at a first preset interval, and then detect the first operating parameter and the second operating parameter; if the indoor heat exchange temperature difference detected at the third target moment is less than or equal to the first preset indoor heat exchange temperature difference, and the exhaust inner ring temperature difference, the whole machine current and the outdoor heat exchange temperature difference detected at the third target moment are respectively greater than or equal to the second preset exhaust inner ring temperature difference, the second preset whole machine current and the second preset outdoor heat exchange temperature difference, then it is determined that there is a welding blockage fault in the target coil branch, and the speed of the indoor motor is controlled to be adjusted from the third speed gear to the first speed gear.

[0084] For example, the second preset exhaust inner ring temperature difference is recorded as D_Tin2, the second preset whole machine current is recorded as Ih2, and the second preset outdoor heat exchange temperature difference is recorded as ΔTout2.

[0085] Specifically, the controller 71 controls the low speed gear of the indoor motor to be adjusted to the third speed gear, and then runs at a medium speed for a period of time, for example, k, where k includes multiple first preset intervals, so that the indoor motor runs from the second target time t(j) to the third target time, and the third target time is recorded as t(j+2k).

[0086] At this time, the controller 71 detects the first operating parameter and the second operating parameter at the third target time t(j+2k). If the indoor heat exchange temperature difference detected at the third target time t(j+2k) (for example, ΔTin(j+2k)) is less than or equal to the first preset indoor heat exchange temperature difference ΔTin1, that is, ΔTin(j+2k) △Tin1, and the exhaust inner ring temperature difference detected at the third target time t(j+2k) (for example, recorded as D_Tin(j+2k)) is greater than or equal to the second preset exhaust inner ring temperature difference D_Tin2, that is, D_Tin(j+2k) D_Tin2; the whole machine current Ih(j+2k) detected at the third target time t(j+2k) is greater than or equal to the second preset whole machine current Ih2, i.e. Ih(j+2k) Ih2; and the outdoor heat exchange temperature difference △Tout(j+2k) detected at the third target time t(j+2k) is greater than the second preset outdoor heat exchange temperature difference △Tout2, ie △Tout(j+2k) △Tout2.

[0087] When the first operating parameter and the second operating parameter meet the above conditions, it can be determined that the target coil branch has a welding blockage fault, that is, it is determined that the target coil branch is suspected of being welded and blocked, and the controller 71 controls the speed of the indoor motor to adjust from the second speed to the third speed gear, that is, to increase the speed of the indoor motor from a low speed to a medium speed. This can avoid the misjudgment caused by directly determining that the target coil branch has a welding blockage fault after determining that the target coil branch has a welding blockage fault at a medium speed. By adjusting the speed gear of the indoor motor to further perform welding blockage fault judgment, the accuracy of target coil branch welding blockage fault detection can be improved.

[0088] In one embodiment of the present invention, after the speed of the indoor motor is controlled to be adjusted from the third speed gear to the first speed gear, the controller 71 is configured to: control the compressor to operate from the third target time to the fourth target time at a first preset interval, and then detect the first operating parameter and the second operating parameter; if the indoor heat exchange temperature difference at the fourth target time is less than or equal to the first preset indoor heat exchange temperature difference, and the exhaust inner ring temperature difference, the whole machine current and the outdoor heat exchange temperature difference detected at the fourth target time are respectively greater than or equal to the third preset exhaust inner ring temperature difference, the third preset whole machine current and the third preset outdoor heat exchange temperature difference, then it is determined that there is a welding blockage fault in the target coil branch.

[0089] For example, the third preset exhaust inner ring temperature difference is recorded as D_Tin3, the third preset whole machine current is recorded as Ih3, and the third preset outdoor heat exchange temperature difference is recorded as ΔTout3.

[0090] In an embodiment, the controller 71 controls the medium speed gear of the indoor motor to be adjusted to the first speed gear, and then runs at a high speed for a period of time, for example, k, where k includes multiple first preset intervals, so that the indoor motor runs from the third target time t(j+2k) to the fourth target time, and the fourth target time is recorded as t(j+3k).

[0091] At this time, the controller 71 detects the first operating parameter and the second operating parameter at the fourth target time t(j+3k). If the indoor heat exchange temperature difference detected at the fourth target time t(j+23k) (for example, ΔTin(j+3k)) is less than or equal to the first preset indoor heat exchange temperature difference ΔTin1, that is, ΔTin(j+3k) △Tin1, and the exhaust inner ring temperature difference detected at the fourth target time t(j+3k) (for example, recorded as D_Tin(j+3k)) is greater than or equal to the third preset exhaust inner ring temperature difference D_Tin3, that is, D_Tin(j+3k) D_Tin3; the whole machine current Ih(j+3k) detected at the fourth target time t(j+3k) is greater than or equal to the third preset whole machine current Ih32, ie Ih(j+3k) Ih3; and the outdoor heat exchange temperature difference △Tout(j+3k) detected at the fourth target time t(j+3k) is greater than the third preset outdoor heat exchange temperature difference △Tout3, ie △Tout(j+3k) △Tout3.

[0092] When the first operating parameter and the second operating parameter meet the above conditions, it can be determined that the target coil branch has a welding blockage fault. In this way, by repeatedly judging that the target coil branch has a welding blockage fault and continuously adjusting the speed of the indoor motor to repeatedly verify that the target coil branch does have a welding blockage fault, it is possible to avoid misjudgment of welding blockage fault detection and improve the accuracy of welding blockage fault detection.

[0093] In one embodiment of the present invention, after reading the welding plugging fault information, the controller 71 is also configured to: when the whole machine current is greater than or equal to the fourth preset whole machine current, and / or the exhaust inner ring temperature difference is greater than or equal to the fourth preset exhaust inner ring temperature difference, the speed gear of the motor in the control room is adjusted from the stop state to the second speed gear used to characterize the low speed.

[0094] The fourth preset whole machine current is recorded as Ih4, and the fourth preset exhaust inner ring temperature difference is recorded as D_Tin4.

[0095] In an embodiment, when there is welding blockage fault information in the memory, the controller 71 reads the welding blockage fault information and controls the air conditioner 10 to start the anti-cold wind control and control the compressor to start. Since the indoor motor is in a stopped state at this time, the speed gear of the indoor motor will be adjusted according to the whole machine current Ih and / or the exhaust inner ring temperature D_Tin.

[0096] Specifically, when the whole machine current Ih is greater than or equal to the fourth preset whole machine current Ih4, that is, Ih Ih4, and / or the exhaust inner ring temperature difference D_Tin is greater than or equal to the fourth preset exhaust inner ring temperature difference D_Tin4, that is, D_Tin D_Tin4, when at least one of these two conditions is met, the speed gear of the indoor motor is controlled to be adjusted from the stop state to the second speed gear, that is, the speed of the indoor motor is increased from stop to low speed, so as to optimize the operating efficiency and performance of the air conditioner 10, and at the same time ensure that the user can still feel the appropriate temperature in the case of a welding blockage fault, avoid direct blowing of cold wind, and improve the user experience.

[0097] In one embodiment of the present invention, after the speed gear of the motor in the control room is adjusted from a stopped state to a second speed gear for characterizing a low speed, the controller 71 is configured as follows: when the whole machine current is greater than or equal to the fifth preset whole machine current, and / or the exhaust inner ring temperature difference is greater than or equal to the fifth preset exhaust inner ring temperature difference, the speed of the motor in the control room is adjusted from the second speed gear to the third speed gear for characterizing a medium speed.

[0098] The fifth preset whole machine current is recorded as Ih5, and the fifth preset exhaust inner ring temperature difference is recorded as D_Tin5.

[0099] In an embodiment, after the controller 71 controls the speed gear of the indoor motor to increase from a stopped state to a low speed, it will also obtain the whole machine current Ih and the exhaust inner ring temperature D_Tin of the air conditioner 10, and adjust the speed gear of the indoor motor according to the whole machine current Ih and / or the exhaust inner ring temperature D_Tin.

[0100] Specifically, when the whole machine current Ih is greater than or equal to the fifth preset whole machine current Ih5, that is, Ih Ih5, and / or the exhaust inner ring temperature difference D_Tin is greater than or equal to the fifth preset exhaust inner ring temperature difference D_Tin5, that is, D_Tin D_Tin5, when at least one of these two conditions is met, the controller 71 will respond immediately and adjust the speed gear of the indoor motor from the current low speed to the medium speed, so as to optimize the operating efficiency of the air conditioner 10 and the comfort of the indoor environment.

[0101] In one embodiment of the present invention, after the speed gear of the motor in the control room is adjusted from the second speed gear to the third speed gear for representing a medium speed, the controller 71 is configured as follows: when the whole machine current is greater than or equal to the sixth preset whole machine current, and / or the exhaust inner ring temperature difference is greater than or equal to the sixth preset exhaust inner ring temperature difference, the speed of the motor in the control room is adjusted from the third speed gear to the first speed gear.

[0102] The sixth preset whole machine current is recorded as Ih6, and the sixth preset exhaust inner ring temperature difference is recorded as D_Tin6.

[0103] In an embodiment, after the controller 71 controls the speed gear of the indoor motor to increase from low speed to medium speed, it will also obtain the whole machine current Ih and the exhaust inner ring temperature D_Tin of the air conditioner 10, and adjust the speed gear of the indoor motor according to the whole machine current Ih and / or the exhaust inner ring temperature D_Tin.

[0104] Specifically, when the whole machine current Ih is greater than or equal to the sixth preset whole machine current Ih6, that is, Ih Ih6, and / or the exhaust inner ring temperature difference D_Tin is greater than or equal to the sixth preset exhaust inner ring temperature difference D_Tin6, that is, D_Tin D_Tin6, when at least one of these two conditions is met, the controller 71 will respond immediately and adjust the speed gear of the indoor motor from the current medium speed to the high speed, so as to optimize the operating efficiency of the air conditioner 10 and the comfort of the indoor environment.

[0105] In one embodiment of the present invention, when controlling the speed of the indoor motor based on the compressor operating frequency, outdoor ambient temperature and exhaust inner ring temperature difference to perform anti-cold wind control, the controller 71 is configured to: after controlling the indoor motor to operate according to the current set speed, obtain the compressor operating frequency, outdoor ambient temperature and exhaust inner ring temperature difference; when the compressor operating frequency is greater than the first operating frequency, and the outdoor ambient temperature is less than the first preset temperature, and the exhaust inner ring temperature difference is less than the seventh preset exhaust inner ring temperature difference, control the indoor motor to reduce the first preset speed from the current set speed, and continue to run for the second preset time until the minimum speed threshold for anti-cold wind operation is reached.

[0106] For example, the operating frequency of the compressor is recorded as F, the first operating frequency is recorded as F1, the first preset temperature is recorded as Tout1, the seventh preset exhaust inner ring temperature difference is recorded as D_Tin7, the first preset speed is recorded as △R, the second preset time is recorded as t2, and the minimum speed threshold is recorded as R_min.

[0107] In the embodiment, in the heating startup phase, in order to prevent the air conditioner 10 from blowing out cold air due to the low temperature of the indoor coil, which makes the user feel uncomfortable, the anti-cold wind control will be performed in the heating startup phase, such as Figure 4 As shown in the figure, the speed gear of the indoor motor will increase step by step as the indoor coil temperature rises until it reaches the first speed gear (i.e. high speed). This is the normal operating mode. However, if the target coil branch circuit is blocked by welding, such as Figure 5 As shown, the indoor coil temperature detected by the indoor coil temperature sensor on the target coil branch will be close to or only slightly higher than the indoor ambient temperature, causing the indoor motor speed to increase slowly or even fail to reach the first speed gear. This is because the welding blockage restricts the flow of refrigerant in the target coil branch, affecting the heat transfer.

[0108] After entering the heating operation stage, in order to prevent the indoor heat exchanger from frosting and causing the indoor coil temperature to be too low under low-temperature conditions, and the air conditioner 10 blowing cold air to cause discomfort to users, the controller 71 will also perform anti-cold air control. For example, Figure 6 as shown, at this time, the speed gear of the indoor motor will gradually decrease as the indoor coil temperature drops until the lowest speed threshold is reached. Similarly, as Figure 7 shown, if a welding blockage fault occurs in the target coil branch, the indoor coil temperature will remain at a level close to the indoor ambient temperature, resulting in the indoor motor continuously running at the lowest speed threshold and unable to make adjustments according to actual needs.

[0109] In addition, the indoor coil temperature is also affected by the outdoor frosting thickness and the indoor ambient temperature. As Figure 8 shown, as the outdoor frosting thickness increases, the exhaust temperature begins to gradually decrease after reaching the peak value, and the indoor coil temperature also shows a downward trend. Especially in the later stage of frosting, this downward trend will accelerate. At the same time, as Figure 9 shown, the increase in the indoor ambient temperature will also cause the indoor ambient temperature to rise.

[0110] In a specific embodiment, based on the above laws and phenomena, if it is determined that there is a welding blockage fault in the target coil branch and anti-cold air control is performed, if the currently set speed by the user is a high speed, the indoor motor will be controlled to run at a high speed to meet the comfort requirements of the user; if the currently set speed by the user is not a high wind speed, such as a low speed or a medium speed, etc., the controller 71 will control the indoor motor to run at a low speed or a medium speed. At the same time, the controller 71 will continuously detect the compressor operating frequency F of the air conditioner 10, the outdoor ambient temperature Tout, and the exhaust inner ring temperature difference D_Tin. When the compressor operating frequency F is greater than the first operating frequency F1, that is, F > F1, and the outdoor ambient temperature Tout is less than the first preset temperature Tout1, that is, Tout < Tout1, and the exhaust inner ring temperature difference D_Tin is less than the seventh preset exhaust inner ring temperature difference D_Tin7, that is, D_Tin < D_Tin7, the controller 71 will gradually reduce the speed of the indoor motor, reduce the first preset speed △R from the current set speed, and continuously run for t2 minutes at the new speed. This process will be repeated until the speed of the indoor motor drops to the lowest speed threshold R_min for anti-cold air operation. This can ensure that cold air is not directly blown at users while dynamically adjusting the speed of the indoor motor according to real-time operating parameters and user needs to achieve the best comfort.

[0111] Among them, the first operating frequency F1 is greater than 60Hz, that is, F1>60Hz, the seventh preset exhaust inner ring temperature difference D_Tin7 is less than 60℃, that is, D_Tin7<60℃. The specific values of the first operating frequency and the seventh preset exhaust inner ring temperature difference vary depending on the platform; the outdoor ambient temperature Tout is less than or equal to -1℃, that is, Tout -1°C may represent a temperature threshold at which frost may form on the outdoor heat exchanger.

[0112] In one embodiment of the present invention, when performing waste heat blowing control based on the speed and running time of the indoor motor, the controller 71 is configured as follows: when the waste heat blowing control condition is met, the indoor motor is controlled to adjust from the first speed gear to the second speed gear and run continuously for a third preset time, and then the indoor motor is controlled to stop running, wherein the waste heat blowing control condition includes: receiving a shutdown command and / or the compressor stops running.

[0113] The third preset time is, for example, recorded as t1.

[0114] In this embodiment, when a welding blockage fault is determined for a target coil branch, the indoor coil temperature corresponding to that target branch will no longer be used as a reference factor for indoor motor speed control. At this point, if the controller 71 receives a shutdown command from the user, or if the preset compressor stop temperature is reached, causing the compressor to stop operating (i.e., the compressor operating frequency is 0 Hz, indicating that the compressor has completely stopped), the controller 71 will adjust the speed gear of the indoor motor from a first speed gear to a second speed gear, i.e., control the indoor motor to reduce its speed from a high speed to a low speed, and operate at the low speed for t1 seconds. After the compressor stops operating, the low speed of the indoor motor will be used to dissipate residual heat in the indoor coil, thereby improving user comfort and avoiding problems caused by residual heat accumulation. After t1 seconds of residual heat blowing, the indoor motor will stop, completing the residual heat blowing control. This ensures that after the welding blockage fault is detected for the target coil branch, the air conditioner 10 can be shut down safely and efficiently while maintaining the comfort of the indoor environment as much as possible.

[0115] In one embodiment of the present invention, after determining that a welding blockage fault exists in the branch where the indoor coil temperature sensor is located, the controller 71 is configured to control the air conditioner 10 to stop performing refrigerant leakage fault determination in the heating mode.

[0116] In the embodiment, in order to ensure the normal operation of the refrigeration system of the air conditioner 10, multiple conditions are usually considered to determine whether there is a refrigerant leakage fault. One important judgment condition is: when the real-time operating frequency of the compressor exceeds 60Hz, if the real-time detected indoor heat exchange temperature difference △Tin is less than 10°C, and the real-time detected exhaust superheat DSH is greater than 60°C, it may indicate that there is a refrigerant leakage fault. However, if Figure 10 As shown in Figure 1, when the target coil branch is blocked by welding, the indoor coil temperature Tc will be approximately equal to the indoor ambient temperature Tin, which will make the indoor heat exchange temperature difference △Tin very small, usually less than 10℃. Figure 11 As shown, due to the obstruction of refrigerant circulation caused by the welding blockage, the exhaust temperature Td may rise abnormally, while the indoor coil temperature Tc cannot effectively rise due to the welding blockage. As a result, the exhaust superheat DSH will become very large, usually exceeding 60°C. In this case, if the operating frequency of the compressor is higher than 60Hz, the controller 71 may mistakenly determine that the welding blockage is a refrigerant leakage fault. However, in reality, once it can be confirmed that the target coil branch has a welding blockage fault, it means that the refrigerant in the refrigeration system has not leaked or the leakage is very small. Therefore, after detecting that the target coil branch has a welding blockage fault, in order to avoid misjudgment, the controller 71 will stop determining the refrigerant leakage fault in the heating mode.

[0117] In one embodiment of the present invention, before the air conditioner 10 starts heating operation, the controller 71 is configured to: determine whether the indoor coil temperature sensor is faulty; if so, report the fault, and control the speed of the indoor motor based on the compressor operating frequency, outdoor ambient temperature and exhaust inner ring temperature difference to perform cold wind prevention control, and / or based on the speed and operating time of the indoor motor to perform waste heat blowing control; if not, execute the steps of reading welding blockage fault information or obtaining welding blockage fault information.

[0118] In this embodiment, before the air conditioner 10 starts heating, the controller 71 first checks the operating status of the indoor coil temperature sensor. If a fault is detected in the indoor coil temperature sensor, such as an open circuit or short circuit, the air conditioner 10 will be unable to accurately obtain the indoor coil temperature. Once the indoor coil temperature sensor fault is determined, the controller 71 sends fault information to the cloud to report the fault. Simultaneously, the controller 71 adjusts the speed of the indoor motor based on the compressor operating frequency, the outdoor ambient temperature, and the exhaust inner ring temperature difference to implement cold air prevention control to prevent cold air from blowing directly towards the user, and / or implements residual heat blowing control based on the indoor motor speed and operating time to ensure a stable and comfortable indoor ambient temperature.

[0119] If the indoor coil temperature sensor is working properly and no fault occurs, the controller 71 will continue to execute its preset process, that is, read the welding fault information or obtain the welding fault information, so as to monitor and respond to possible welding faults during the heating operation to ensure the smooth and safe operation of the heating process.

[0120] In one embodiment of the present invention, the indoor coil temperature sensor includes one or more indoor coil temperature sensors. When there are multiple indoor coil temperature sensors, the multiple indoor coil temperature sensors are disposed on multiple coil branches of the indoor heat exchanger in a one-to-one correspondence.

[0121] In the embodiment, the design of the indoor coil temperature sensor takes into account the complexity of the indoor heat exchanger and the uneven temperature distribution, and therefore adopts a configuration including one or more indoor coil temperature sensors. When there are multiple indoor coil temperature sensors, these indoor coil temperature sensors are all set in a one-to-one correspondence on different coil branches of the indoor heat exchanger. This layout enables the controller 71 to more accurately and comprehensively monitor the temperature changes of each coil branch in the indoor heat exchanger, thereby providing more accurate temperature data, providing a solid foundation for the intelligent control and optimized operation of the air conditioner 10. In this way, not only is the accuracy of temperature measurement improved, but it also helps to promptly detect and respond to potential welding blockage faults, ensuring the efficient and stable operation of the air conditioner 10.

[0122] In summary, for example, the speed gear of the indoor motor is set to 3 gears (i.e., R3, R2, R1), where R3 represents the first speed gear and R3=1000rpm, R2 represents the third speed gear and R2=900rpm, R1 represents the second speed gear and R1=800rpm, the first preset indoor heat exchange temperature difference △Tin1=5°C, the first preset exhaust inner ring temperature difference D_Tin1=11°C, the first preset whole machine current Ih1=3A, and the first preset outdoor heat exchange temperature difference △Tout1=2°C.

[0123] The second preset exhaust inner ring temperature difference D_Tin2 = 15°C, the second preset whole machine current Ih2 = 3.4A, and the second preset outdoor heat exchange temperature difference ΔTout2 = 3°C.

[0124] The third preset exhaust inner ring temperature difference D_Tin3 = 20°C, the third preset whole machine current Ih2 = 4A, the third preset outdoor heat exchange temperature difference △Tout2 = 4°C, the first preset interval is 10s, the detection period is k and k = 6, the first operating frequency F1 = 70Hz, the seventh preset exhaust inner ring temperature difference D_Tin7 = 50°C, and the first preset temperature Tout1 = -2°C.

[0125] The fourth preset whole machine current Ih4=3A, the fifth preset whole machine current Ih5=3.4A, and the sixth preset whole machine current Ih2=4A.

[0126] The first preset speed ΔR=20 rpm, the minimum speed threshold R_min=R1, the third preset time is 60s, and the second preset time t2=2min.

[0127] When the memory does not have the rewrite function, when the air conditioner 10 is turned on for heating operation, the user sets the temperature to 23° C., the controller 71 controls the compressor to start, controls the indoor motor to stop, and turns on the cold wind prevention control.

[0128] The controller 71 starts to continuously detect the first operating parameter and the second operating parameter of the air conditioner 10, and detects that the indoor ambient temperature Tin(0) of the compressor at the first moment t0 is 15°C and the indoor coil temperature Tc(0) is 15°C.

[0129] At an interval of 10s, that is, after the first preset interval, the indoor ambient temperature Tin(1) is detected and calculated to be 15°C, the indoor coil temperature Tc(1) is 15°C, the exhaust temperature Td(1) is 2°C, the outdoor ambient temperature Tout(1) is 2°C, the outdoor coil temperature Te(1) is 2°C, the indoor heat exchange temperature difference △Tin(1) is 0°C, the exhaust inner ring temperature difference D_Tin(1) is -13°C, the outdoor heat exchange temperature difference △Tout(1) is 0°C, and the whole machine current Ih(1) is 1.2A.

[0130] At an interval of 20s, that is, after the second first preset interval, the detected and calculated indoor ambient temperature Tin(2) = 15°C, indoor coil temperature Tc(2) = 15°C, exhaust temperature Td(2) = 5°C, outdoor ambient temperature Tout(2) = 2°C, outdoor coil temperature Te(2) = 1°C, indoor heat exchange temperature difference △Tin(2) = 0°C, exhaust inner ring temperature difference D_Tin(2) = -10°C, outdoor heat exchange temperature difference △Tout(2) = 1°C, and total machine current Ih(2) = 1.6A.

[0131] At an interval of 30s, that is, after the third first preset interval, the indoor ambient temperature Tin(3) = 15°C, the indoor coil temperature Tc(3) = 15°C, the exhaust temperature Td(3) = 15°C, the outdoor ambient temperature Tout(3) = 2°C, the outdoor coil temperature Te(3) = -1°C, the indoor heat exchange temperature difference △Tin(3) = 0°C, the exhaust inner ring temperature difference D_Tin(3) = 0°C, the outdoor heat exchange temperature difference △Tout(3) = 3°C, and the whole machine current Ih(3) = 2.4A are detected and calculated.

[0132] At an interval of 60s, that is, after the sixth first preset interval, which can also be understood as after one detection cycle, the indoor ambient temperature Tin(6) = 15°C, the indoor coil temperature Tc(6) = 16°C, the exhaust temperature Td(6) = 30°C, the outdoor ambient temperature Tout(6) = 2°C, the outdoor coil temperature Te(6) = -4°C, the indoor heat exchange temperature difference △Tin(6) = 1°C, the exhaust inner ring temperature difference D_Tin(6) = 15°C, the outdoor heat exchange temperature difference △Tout(6) = 6°C, and the whole machine current Ih(6) = 4.4A are detected and calculated.

[0133] When the operating parameters detected at 60s are used as the operating parameters detected at the first target moment, that is, when j=6, the indoor heat exchange temperature difference △Tin(6) at the first target moment is less than the first preset indoor heat exchange temperature difference △Tin1, that is, △Tin(6)=0.5℃<△Tin1=5℃ at this time, and the exhaust inner ring temperature difference D_Tin(6) at the first target moment is greater than the first preset exhaust inner ring temperature difference D_Tin1, that is, D_Tin(6)=15℃>D_Tin1=10℃, and the first target moment is less than the first preset exhaust inner ring temperature difference D_Tin1. The whole machine current Ih(6) at the target moment is greater than the first preset whole machine current Ih1, that is, Ih(6)=4.4A>Ih1=3A, and the outdoor heat exchange temperature difference ΔTout(6) at the first target moment is greater than the first preset outdoor heat exchange temperature difference ΔTou1, that is, ΔTout(6)=6℃>ΔTou1=2℃. At this time, it can be preliminarily determined that there is a welding blockage fault in the target coil branch, that is, it is suspected that there is a welding blockage fault in the target coil branch, and the controller 71 controls the indoor motor to increase the speed from the stopped state to the low speed operation.

[0134] After the indoor motor runs at a low speed for a period of time, that is, it runs again for 60 seconds, the compressor starts 120 seconds later (or two detection cycles). It is detected that the indoor heat exchange temperature difference △Tin(12) at the second target moment is less than the first preset indoor heat exchange temperature difference △Tin1, that is, △Tin(12)=1℃<△Tin1=5℃, and the exhaust inner ring temperature difference D_Tin(12) at the second target moment is greater than the first preset exhaust inner ring temperature difference D_Tin1, that is, D_Tin(12)=25℃>D_Tin1=10℃ , and the whole machine current Ih(12) at the second target moment is greater than the first preset whole machine current Ih1, that is, Ih(12)=5.4A>Ih1=3A, and the outdoor heat exchange temperature difference △Tout(12) at the second target moment is greater than the first preset outdoor heat exchange temperature difference △Tou1, that is, △Tout(12)=1℃>△Tou1=2℃. At this time, it is further determined that there is a welding blockage fault in the target coil branch. It is also suspected that there is a welding blockage fault in the target coil branch. The controller 71 controls the indoor motor to increase the speed from low to medium.

[0135] After the indoor motor runs at a medium speed for 60 seconds, that is, 180 seconds after the compressor starts (or three detection cycles), the indoor heat exchange temperature difference △Tin(18) detected at the third target time is less than the first preset indoor heat exchange temperature difference △Tin1, that is, △Tin(18)=2℃<△Tin1=5℃, and the exhaust inner ring temperature difference D_Tin(18) detected at the third target time is greater than the second preset exhaust inner ring temperature difference D_Tin2, that is, D_Tin(18)=30℃>D_Tin2= 15℃, the whole machine current Ih(18) at the third target moment is greater than the second preset whole machine current Ih2, that is, Ih(18)=6.4A>Ih2=3.4A, and the outdoor heat exchange temperature difference △Tout(18) is greater than the second preset outdoor heat exchange temperature difference △Tou2, that is, △Tout(18)=6℃>△Tou2=3℃, it is determined that the target coil branch has a welding blockage fault, and it is also suspected that the target coil branch has a welding blockage fault. At this time, the controller 71 controls the indoor motor to increase the speed from medium to high.

[0136] When the compressor runs from the third target time to the fourth target time at the first preset interval (i.e., 10s), that is, 240s after the compressor starts (or four detection cycles), the indoor heat exchange temperature difference △Tin(24) at the fourth target time is less than the first preset indoor heat exchange temperature difference △Tin1, that is, △Tin(24)=2℃<△Tin1=5℃, the exhaust inner ring temperature difference D_Tin(24) at the fourth target time is greater than the third preset exhaust inner ring temperature difference D_Tin3, that is, D_Tin(24)=38℃>D_Tin3=20℃, the whole machine current Ih(24) at the fourth target time is greater than the third preset whole machine current Ih3, that is, Ih(24)=6.4A>Ih3=4A, △Tout(24)=6℃>△Tou3=4℃, then it is determined that the target coil branch has a welding blockage fault.

[0137] When the memory has a data rewrite function, each time the air conditioner starts heating, it first reads information about whether the target coil branch is blocked by welding. If a welding blockage is present, the air conditioner initiates cold air control during startup. Upon receiving a heating command, the compressor starts first, and the indoor motor stops first. 60 seconds after the compressor starts, if the detected total current Ih is greater than or equal to a fourth preset total current Ih4 (i.e., Ih = 3.4A ≥ Ih4 = 3A), the indoor motor is increased from a stopped state to a low speed. 180 seconds after the compressor starts, if the detected total current Ih is greater than or equal to a fifth preset total current Ih5 (i.e., Ih = 5.4A ≥ Ih2 = 3.4A), the indoor motor is increased from a low speed to a medium speed. 240 seconds after the compressor starts, if the real-time detected total current Ih is equal to or equal to a sixth preset total current Ih6 (i.e., Ih = 6.4A ≥ Ih6 = 4A), the indoor motor is increased from a medium speed to a high speed.

[0138] After reading or acquiring welding plug fault information and the cold wind prevention start phase ends, the cold wind prevention operation phase begins. After several detection cycles, the real-time detected compressor operating frequency F is greater than the first operating frequency F1, i.e., F = 95 Hz > F1 = 70 Hz, the real-time detected exhaust inner ring temperature difference D_Tin is less than the seventh preset inner ring temperature difference D_Tin7, i.e., D_Tin = 40°C < D_Tin7 = 50°C, and the real-time detected outdoor ambient temperature Tout is less than the first preset temperature Tout1, i.e., Tout = -10°C < Tout1 = -2°C. At this time, the indoor motor speed is controlled to decrease from the first speed gear R3 to the first preset speed ΔR, and the speed is now 980 rpm.

[0139] After the second preset time t2, that is, 2 minutes, is continuously run, if the above conditions are still met, the indoor motor speed continues to decrease by the first preset speed △R=20rpm, and the speed is now 960rpm, until the minimum speed threshold is reached.

[0140] If the temperature-reaching shutdown condition is met and the compressor stops running, the indoor motor is controlled to run at a low speed, and after running for a third preset time of 60s, the indoor motor is controlled to stop.

[0141] At this time, it has been determined that there is a welding blockage fault in the target coil branch, so the refrigerant leakage fault protection in the heating mode is invalid, and the refrigerant leakage fault judgment in the heating mode will no longer be performed.

[0142] According to the air conditioner 10 of an embodiment of the present invention, after the controller 71 controls the air conditioner 10 to start heating operation, it starts the cold wind prevention control, and continuously obtains the first operating parameter of the air conditioner at a first preset interval, calculates the second operating parameter based on the first operating parameter, and then gradually determines whether the target coil branch has a welding blockage fault based on the first operating parameter and the second operating parameter. When it is determined based on the operating parameters that the target coil branch has a welding blockage fault, the controller 71 will gradually adjust the speed gear of the indoor motor until the speed gear of the indoor motor is adjusted from the stop state to the first speed gear. If it is still determined that the target coil branch has a welding blockage fault, it is determined that the target coil branch has a welding blockage fault. In this way, by repeatedly determining that the target coil branch has a welding blockage fault and continuously adjusting the speed of the indoor motor, it is verified multiple times that the target coil branch does have a welding blockage fault, which can avoid misjudgment of welding blockage fault detection and improve the accuracy of welding blockage fault detection.

[0143] The welding blockage fault information is then stored in the memory, and the characteristics of the memory can determine whether the welding blockage fault information can be directly read the next time the heating is started. If the current memory has an overwrite function, the welding blockage fault information can be directly read the next time the heating is turned on, saving fault detection time. If the overwrite function is not available, the welding blockage fault information is re-acquired based on the above steps after the heating is turned on. After determining that the target coil branch has a welding blockage fault, the speed of the indoor motor will be dynamically adjusted based on the compressor frequency, the outdoor ambient temperature, and the exhaust inner ring temperature difference to perform cold wind prevention control to ensure that the indoor temperature will not suddenly drop due to the welding blockage fault, causing the user to feel uncomfortable, and / or, the waste heat blowing control is performed according to the speed and running time of the indoor motor to further utilize the waste heat inside the system to improve heating efficiency, reduce energy waste, and ensure user comfort, while also ensuring that the air conditioner 10 can operate normally and enhance user experience.

[0144] Reference below Figure 12 A method for controlling an air conditioner according to an embodiment of the present invention is described.

[0145] like Figure 12 As shown, the air conditioner control method according to the embodiment of the present invention at least includes steps S1 to S4.

[0146] Step S1 : when the air conditioner is turned on for heating operation, it is determined whether welding blockage fault information is stored in the memory.

[0147] Step S2: If yes, read the welding blockage fault information; if no, determine whether the target coil branch has a welding blockage fault.

[0148] Step S3: If it exists, obtain the welding blockage fault information and store the welding blockage fault information in the memory.

[0149] Step S4, after reading or obtaining the welding blockage fault information, the speed of the indoor motor is controlled based on the compressor operating frequency, the outdoor ambient temperature and the exhaust inner ring temperature difference to perform cold wind prevention control, and / or based on the speed and operating time of the indoor motor to perform waste heat blowing control.

[0150] Among them, the process of obtaining welding blockage fault information includes: controlling the air conditioner to start the anti-cold wind control, and continuously detecting the first operating parameter of the air conditioner at a first preset interval, and determining the second operating parameter based on the first operating parameter, wherein the first operating parameter includes: indoor ambient temperature, indoor coil temperature, exhaust temperature, outdoor ambient temperature, outdoor coil temperature and whole machine current; according to the first operating parameter and the second operating parameter, gradually judging whether the target coil branch has a welding blockage fault, if it is determined that the target coil branch has a welding blockage fault, then gradually adjusting the speed gear of the indoor motor, wherein the second operating parameter includes: indoor heat exchange temperature difference, exhaust superheat, outdoor heat exchange temperature difference and exhaust inner ring temperature difference; until the speed gear of the indoor motor is gradually adjusted from the stopped state to the first speed gear used to characterize high speed, if it is still determined that the target coil branch has a welding blockage fault, then determining that the target coil branch has a welding blockage fault, and generating welding blockage fault information.

[0151] In one embodiment of the present invention, when gradually judging whether a target coil branch has a welding blockage fault based on a first operating parameter and a second operating parameter, and if it is judged that a welding blockage fault exists in the target coil branch, gradually adjusting the speed gear of the indoor motor includes: controlling the compressor to operate from a first moment to a first target moment at a first preset interval, and then detecting the first operating parameter and the second operating parameter; if all indoor heat exchange temperature differences from the first moment to the first target moment are less than or equal to the first preset indoor heat exchange temperature difference, and the exhaust inner ring temperature difference and the outdoor heat exchange temperature difference both show an increasing trend, and the exhaust inner ring temperature difference, the whole machine current and the outdoor heat exchange temperature difference detected at the first target moment are respectively greater than or equal to the first preset exhaust inner ring temperature difference, the first preset whole machine current and the first preset outdoor heat exchange temperature difference, then it is preliminarily judged that a welding blockage fault exists in the target coil branch, and the speed of the indoor motor is controlled to be adjusted from a stopped state to a second speed gear for characterizing a low speed.

[0152] In one embodiment of the present invention, after controlling the speed of the indoor motor to adjust from a stopped state to a second speed gear for characterizing a low speed, it includes: controlling the compressor to operate from a first target moment to a second target moment at a first preset interval, detecting a first operating parameter and a second operating parameter; if the indoor heat exchange temperature difference detected at the second target moment is less than or equal to the first preset indoor heat exchange temperature difference, and the exhaust inner ring temperature difference, the whole machine current and the outdoor heat exchange temperature difference detected at the second target moment are respectively greater than or equal to the first preset exhaust inner ring temperature difference, the first preset whole machine current and the first preset outdoor heat exchange temperature difference, then it is further determined that there is a welding blockage fault in the target coil branch, and the speed of the indoor motor is controlled to be adjusted from the second speed gear to a third speed gear for characterizing a medium speed.

[0153] In one embodiment of the present invention, after controlling the speed of the indoor motor to be adjusted from the second speed gear to the third speed gear for characterizing a medium speed, it includes: controlling the compressor to operate from the second target time to the third target time at a first preset interval, detecting the first operating parameter and the second operating parameter; if the indoor heat exchange temperature difference detected at the third target time is less than or equal to the first preset indoor heat exchange temperature difference, and the exhaust inner ring temperature difference, the whole machine current and the outdoor heat exchange temperature difference detected at the third target time are respectively greater than or equal to the second preset exhaust inner ring temperature difference, the second preset whole machine current and the second preset outdoor heat exchange temperature difference, then it is determined that there is a welding blockage fault in the target coil branch, and the speed of the indoor motor is controlled to be adjusted from the third speed gear to the first speed gear.

[0154] In one embodiment of the present invention, after controlling the speed of the indoor motor to be adjusted from the third speed gear to the first speed gear, it includes: controlling the compressor to operate from the third target time to the fourth target time at a first preset interval, detecting the first operating parameter and the second operating parameter; if the indoor heat exchange temperature difference at the fourth target time is less than or equal to the first preset indoor heat exchange temperature difference, and the exhaust inner ring temperature difference, the whole machine current and the outdoor heat exchange temperature difference detected at the fourth target time are respectively greater than or equal to the third preset exhaust inner ring temperature difference, the third preset whole machine current and the third preset outdoor heat exchange temperature difference, then it is determined that there is a welding blockage fault in the target coil branch.

[0155] In one embodiment of the present invention, after reading welding blockage fault information or obtaining welding blockage fault information, it includes: when the whole machine current is greater than or equal to the fourth preset whole machine current, and / or the exhaust inner ring temperature difference is greater than or equal to the fourth preset exhaust inner ring temperature difference, the speed gear of the motor in the control room is adjusted from the stop state to the second speed gear used to characterize low speed.

[0156] In one embodiment of the present invention, after the speed gear of the motor in the control room is adjusted from a stopped state to a second speed gear for characterizing a low speed, it includes: when the whole machine current is greater than or equal to a fifth preset whole machine current, and / or the exhaust inner ring temperature difference is greater than or equal to the fifth preset exhaust inner ring temperature difference, the speed of the motor in the control room is adjusted from the second speed gear to a third speed gear for characterizing a medium speed.

[0157] In one embodiment of the present invention, after the speed gear of the motor in the control room is adjusted from the second speed gear to the third speed gear for characterizing a medium speed, it includes: when the whole machine current is greater than or equal to the sixth preset whole machine current, and / or the exhaust inner ring temperature difference is greater than or equal to the sixth preset exhaust inner ring temperature difference, the speed of the motor in the control room is adjusted from the third speed gear to the first speed gear.

[0158] In one embodiment of the present invention, when controlling the speed of the indoor motor based on the compressor operating frequency, outdoor ambient temperature and exhaust inner ring temperature difference to perform anti-cold wind control, it includes: after controlling the indoor motor to operate according to the current set speed, obtaining the compressor operating frequency, outdoor ambient temperature and exhaust inner ring temperature difference, when the compressor operating frequency is greater than the first operating frequency, and the outdoor ambient temperature is less than the first preset temperature, and the exhaust inner ring temperature difference is less than the seventh preset exhaust inner ring temperature difference, controlling the indoor motor to reduce the first preset speed from the current set speed, and continue to run for the second preset time until the minimum speed threshold for anti-cold wind operation is reached.

[0159] In one embodiment of the present invention, when performing waste heat blowing control based on the speed and running time of the indoor motor, it includes: when the waste heat blowing control condition is met, the indoor motor is controlled to adjust from the first speed gear to the second speed gear and continuously run for a third preset time, and then the indoor motor is controlled to stop running, wherein the waste heat blowing control condition includes: receiving a shutdown command and / or the compressor stops running.

[0160] In one embodiment of the present invention, after determining that a welding blockage fault exists in the branch where the indoor coil temperature sensor is located, the method includes: controlling the air conditioner to stop performing refrigerant leakage fault determination in the heating mode.

[0161] In one embodiment of the present invention, before the air conditioner starts heating operation, it includes: determining whether the indoor coil temperature sensor is faulty, and if so, reporting the fault, and controlling the speed of the indoor motor based on the compressor operating frequency, the outdoor ambient temperature and the exhaust inner ring temperature difference to perform cold wind prevention control, and / or based on the speed and operating time of the indoor motor to perform waste heat blowing control; if not, executing the step of reading the welding blockage fault information or obtaining the welding blockage fault information.

[0162] In one embodiment of the present invention, the indoor coil temperature sensor includes one or more indoor coil temperature sensors. When there are multiple indoor coil temperature sensors, the multiple indoor coil temperature sensors are disposed on multiple coil branches of the indoor heat exchanger in a one-to-one correspondence.

[0163] According to the control method of the air conditioner according to the embodiment of the present invention, after the air conditioner is controlled to start heating operation, the cold wind prevention control is started, and the first operating parameter of the air conditioner is continuously obtained at a first preset interval, the second operating parameter is calculated based on the first operating parameter, and then the target coil branch is gradually judged based on the first operating parameter and the second operating parameter. When it is judged based on the operating parameters that the target coil branch has a welding blockage fault, the speed gear of the indoor motor will be gradually adjusted until the speed gear of the indoor motor is adjusted from the stop state to the first speed gear. If it is still judged that the target coil branch has a welding blockage fault, it is determined that the target coil branch has a welding blockage fault. In this way, by judging the target coil branch to have a welding blockage fault multiple times and continuously adjusting the speed of the indoor motor to verify that the target coil branch does have a welding blockage fault multiple times, it is possible to avoid misjudgment of welding blockage fault detection and improve the accuracy of welding blockage fault detection.

[0164] The welding blockage fault information is then stored in the memory, and the characteristics of the memory can determine whether the welding blockage fault information can be directly read the next time the heating is started. If the current memory has an overwrite function, the welding blockage fault information can be directly read the next time the heating is turned on, saving fault detection time. If the overwrite function is not available, the welding blockage fault information is re-acquired based on the above steps after the heating is turned on. After determining that the target coil branch has a welding blockage fault, the speed of the indoor motor will be dynamically adjusted based on the compressor frequency, outdoor ambient temperature, and exhaust inner ring temperature difference to perform anti-cold wind control to ensure that the indoor temperature will not suddenly drop due to the welding blockage fault, causing the user to feel uncomfortable, and / or, the waste heat blowing control is performed according to the speed and running time of the indoor motor to further utilize the waste heat inside the system to improve heating efficiency, reduce energy waste, and ensure user comfort, while also ensuring that the air conditioner can operate normally and enhance user experience.

[0165] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "example," "specific example," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0166] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. An air conditioner, characterized in that: include: A refrigerant circulation loop, wherein the refrigerant undergoes a refrigeration cycle in a loop consisting of a compressor, a condenser, a throttling element, and an evaporator, wherein one of the condenser and the evaporator is an outdoor heat exchanger and the other is an indoor heat exchanger; Indoor temperature sensor, used to detect indoor ambient temperature; Indoor coil temperature sensor, used to detect indoor coil temperature; an exhaust temperature sensor, used to detect the exhaust temperature of the compressor; Outdoor ambient temperature sensor, used to detect outdoor ambient temperature; Outdoor coil temperature sensor, used to detect outdoor coil temperature; A memory, configured to store welding blockage fault information, wherein the welding blockage fault information is used to indicate that a welding blockage fault exists in the target coil branch where the indoor coil temperature sensor is located; A controller configured to: When the air conditioner is turned on for heating operation, determining whether the welding blockage fault information is stored in the memory; If yes, read the welding blockage fault information; if no, determine whether the target coil branch has a welding blockage fault; If so, obtaining the welding blockage fault information and storing the welding blockage fault information in the memory; After reading or obtaining the welding blockage fault information, controlling the speed of the indoor motor based on the compressor operating frequency, the outdoor ambient temperature, and the exhaust inner ring temperature difference to perform cold wind prevention control, and / or performing waste heat blowing control based on the speed and operating time of the indoor motor; The process of obtaining the welding blockage fault information includes: Controlling the air conditioner to start cold wind prevention control, and continuously detecting a first operating parameter of the air conditioner at a first preset interval, and determining a second operating parameter based on the first operating parameter, wherein the first operating parameter includes: the indoor ambient temperature, the indoor coil temperature, the exhaust temperature, the outdoor ambient temperature, the outdoor coil temperature, and the entire machine current; Based on the first operating parameter and the second operating parameter, gradually determining whether the target coil branch has a welding blockage fault, and if it is determined that the target coil branch has a welding blockage fault, gradually adjusting the speed gear of the indoor motor, wherein the second operating parameter includes: indoor heat exchange temperature difference, exhaust superheat, outdoor heat exchange temperature difference, and the exhaust inner ring temperature difference; After the speed gear of the indoor motor is gradually adjusted from the stopped state to the first speed gear for representing a high speed, if it is still determined that the target coil branch has a welding blockage fault, it is determined that the target coil branch has a welding blockage fault and the welding blockage fault information is generated.

2. The air conditioner according to claim 1, characterized in that When determining step by step whether the target coil branch has a welding blockage fault based on the first operating parameter and the second operating parameter, and gradually adjusting the speed gear of the indoor motor if it is determined that the target coil branch has a welding blockage fault, the controller is configured to: After controlling the compressor to operate from a first moment to a first target moment at the first preset interval, detecting the first operating parameter and the second operating parameter; If all indoor heat exchange temperature differences from the first moment to the first target moment are less than or equal to the first preset indoor heat exchange temperature difference, and the exhaust inner ring temperature difference, the outdoor heat exchange temperature difference and the whole machine current all show an increasing trend, and the exhaust inner ring temperature difference, the whole machine current and the outdoor heat exchange temperature difference detected at the first target moment are respectively greater than or equal to the first preset exhaust inner ring temperature difference, the first preset whole machine current and the first preset outdoor heat exchange temperature difference, then it is preliminarily determined that there is a welding blockage fault in the target coil branch, and the speed of the indoor motor is controlled to be adjusted from the stopped state to the second speed gear used to characterize low speed.

3. The air conditioner according to claim 2, characterized in that After controlling the speed of the indoor motor to adjust from a stopped state to a second speed gear representing a low speed, the controller is configured to: After controlling the compressor to operate from the first target time to a second target time at the first preset interval, detecting the first operating parameter and the second operating parameter; If the indoor heat exchange temperature difference detected at the second target time is less than or equal to the first preset indoor heat exchange temperature difference, and the exhaust inner ring temperature difference, the whole machine current and the outdoor heat exchange temperature difference detected at the second target time are respectively greater than or equal to the first preset exhaust inner ring temperature difference, the first preset whole machine current and the first preset outdoor heat exchange temperature difference, it is further determined that there is a welding blockage fault in the target coil branch, and the speed of the indoor motor is controlled to be adjusted from the second speed gear to the third speed gear used to represent a medium speed.

4. The air conditioner according to claim 3, characterized in that After controlling the speed of the indoor motor to adjust from the second speed gear to the third speed gear representing a medium speed, the controller is configured to: After controlling the compressor to operate from the second target time to a third target time at the first preset interval, detecting the first operating parameter and the second operating parameter; If the indoor heat exchange temperature difference detected at the third target time is less than or equal to the first preset indoor heat exchange temperature difference, and the exhaust inner ring temperature difference, the whole machine current and the outdoor heat exchange temperature difference detected at the third target time are respectively greater than or equal to the second preset exhaust inner ring temperature difference, the second preset whole machine current and the second preset outdoor heat exchange temperature difference, then it is determined that there is a welding blockage fault in the target coil branch, and the speed of the indoor motor is controlled to be adjusted from the third speed gear to the first speed gear.

5. The air conditioner according to claim 4, characterized in that After controlling the speed of the indoor motor to adjust from the third speed gear to the first speed gear, the controller is configured to: After controlling the compressor to operate from the third target time to a fourth target time at the first preset interval, detecting the first operating parameter and the second operating parameter; If the indoor heat exchange temperature difference at the fourth target time is less than or equal to the first preset indoor heat exchange temperature difference, and the exhaust inner ring temperature difference, the whole machine current and the outdoor heat exchange temperature difference detected at the fourth target time are respectively greater than or equal to the third preset exhaust inner ring temperature difference, the third preset whole machine current and the third preset outdoor heat exchange temperature difference, then it is determined that there is a welding blockage fault in the target coil branch.

6. The air conditioner according to claim 1, characterized in that After reading or acquiring the welding blockage fault information, the controller is further configured to: When the whole machine current is greater than or equal to the fourth preset whole machine current, and / or the exhaust inner ring temperature difference is greater than or equal to the fourth preset exhaust inner ring temperature difference, the speed gear of the indoor motor is controlled to be adjusted from the stop state to the second speed gear used to represent a low speed.

7. The air conditioner according to claim 6, characterized in that After controlling the speed gear of the indoor motor to adjust from a stopped state to a second speed gear for representing a low speed, the controller is configured to: When the whole machine current is greater than or equal to the fifth preset whole machine current, and / or the exhaust inner ring temperature difference is greater than or equal to the fifth preset exhaust inner ring temperature difference, the speed of the indoor motor is controlled to be adjusted from the second speed gear to the third speed gear used to represent a medium speed.

8. The air conditioner according to claim 7, characterized in that After controlling the speed gear of the indoor motor to be adjusted from the second speed gear to the third speed gear representing a medium speed, the controller is configured to: When the whole machine current is greater than or equal to the sixth preset whole machine current, and / or the exhaust inner ring temperature difference is greater than or equal to the sixth preset exhaust inner ring temperature difference, the speed of the indoor motor is controlled to be adjusted from the third speed gear to the first speed gear.

9. The air conditioner according to claim 1, wherein: When controlling the speed of the indoor motor based on the compressor operating frequency, the outdoor ambient temperature and the exhaust inner ring temperature difference to perform cold wind prevention control, the controller is configured to: After controlling the indoor motor to operate according to the current set speed, the compressor operating frequency, the outdoor ambient temperature and the exhaust inner ring temperature difference are obtained. When the compressor operating frequency is greater than the first operating frequency, and the outdoor ambient temperature is less than the first preset temperature, and the exhaust inner ring temperature difference is less than the seventh preset exhaust inner ring temperature difference, the indoor motor is controlled to reduce the first preset speed from the current set speed, and continue to run for a second preset time until the minimum speed threshold for anti-cold wind operation is reached.

10. The air conditioner according to claim 1, wherein When performing waste heat blowing control based on the speed and running time of the indoor motor, the controller is configured as follows: When the waste heat blowing control condition is met, the indoor motor is controlled to adjust from the first speed gear to the second speed gear and run continuously for a third preset time, and then the indoor motor is controlled to stop running, wherein the waste heat blowing control condition includes: receiving a shutdown command and / or the compressor stopping running.

11. The air conditioner according to claim 1, wherein: After determining that a welding blockage fault exists in the branch where the indoor coil temperature sensor is located, the controller is configured to: The air conditioner is controlled to no longer perform refrigerant leakage fault judgment in the heating mode.

12. The air conditioner according to claim 1, wherein Before the air conditioner starts heating operation, the controller is configured to: determining whether the indoor coil temperature sensor is faulty, and if so, reporting the fault, and controlling the speed of the indoor motor based on the compressor operating frequency, the outdoor ambient temperature, and the exhaust inner ring temperature difference to perform the cold wind prevention control, and / or performing the waste heat blowing control based on the speed of the indoor motor and the operating time; If not, the step of reading the welding blockage fault information or obtaining the welding blockage fault information is performed.

13. The air conditioner according to claim 1, wherein The indoor coil temperature sensor includes one or more. When there are multiple indoor coil temperature sensors, the multiple indoor coil temperature sensors are arranged in a one-to-one correspondence on the multiple coil branches of the indoor heat exchanger.

Images