Control method for heat recovery system, control apparatus, and computer-readable storage medium

Abstract

The present application discloses a control method for a heat recovery system, a control apparatus, an air conditioner, and a computer-readable storage medium. The control method comprises: acquiring an outdoor temperature, a target frequency of a compressor, and a measured temperature of an electrically-controlled heating element (S100); on the basis of the outdoor temperature and the target frequency, determining an initial gear of a fan (S200); and, on the basis of the initial gear and the measured temperature, adjusting the gear of the fan (S300).

Description

Control methods, control devices, and computer-readable storage media for heat recovery systems

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese Patent Application No. 202411045925.8, filed on July 31, 2024, entitled "Control Method, Control Device and Computer-Readable Storage Medium for Heat Recovery System", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of control technology for heat recovery systems, and in particular to a control method, control device, air conditioner, and computer-readable storage medium for a heat recovery system. Background Technology

[0004] A heat recovery air conditioner is an air conditioner that can simultaneously meet the needs of conventional hot water production and air conditioning cooling / heating. If the cooling and hot water production demands are matched, the system can enter a full heat recovery mode. In this mode, the water tank acts as the condenser, the indoor unit acts as the evaporator, and the outdoor unit condenser does not participate in heat exchange.

[0005] Most existing air conditioning systems control the fan based on the condenser condensing temperature. However, in the total heat recovery mode, the refrigerant does not need to flow through the outdoor unit condenser. At this time, the fan control is unrelated to the condensing temperature. Inappropriate fan control can easily lead to a shortened motor life, higher overall energy consumption, and the risk of burnout due to insufficient heat dissipation of the electronic control system. Summary of the Invention

[0006] The embodiments of this application provide a control method, control device, air conditioner, and computer-readable storage medium for a heat recovery system. This enables more intelligent control of the fan when the heat recovery system is in full heat recovery mode. It can not only prevent the temperature of the electronic control module from getting too high, thus improving the safety of the electronic control module and extending the service life of the fan, but also save energy.

[0007] An embodiment of the first aspect of this application provides a control method for a heat recovery system, the heat recovery system including a compressor, a fan, and electrically controlled heating components, the control method including:

[0008] The outdoor temperature, the target frequency of the compressor, and the detection temperature of the electronically controlled heating element are obtained.

[0009] The initial speed of the fan is determined based on the outdoor temperature and the target frequency; and

[0010] The fan speed is adjusted according to the initial speed and the detected temperature.

[0011] The control method for the heat recovery system according to the first aspect of this application has at least the following beneficial effects: In the process of controlling the heat recovery system, the outdoor temperature, the target frequency of the compressor, and the detection temperature of the electronically controlled heating element are first obtained; then, the initial speed of the fan can be determined according to the outdoor temperature and the target frequency of the compressor; finally, the speed of the fan can be adjusted according to the initial speed of the fan and the detection temperature of the electronically controlled heating element, so as to realize the control of the fan speed. This enables the heat recovery system to achieve intelligent adjustment of the fan in the full heat recovery mode, which can not only effectively prevent the temperature of the electronic control module from becoming too high, improve the safety of the electronic control module, extend the service life of the fan, but also save energy.

[0012] In some embodiments, determining the initial speed of the fan based on the outdoor temperature and the target frequency includes:

[0013] Temperature range information is determined based on the outdoor temperature and a preset temperature range; and frequency range information is determined based on the target frequency and a preset frequency range; and

[0014] The initial gear is determined based on the temperature range information and the frequency range information.

[0015] In some embodiments, the process of adjusting the fan speed based on the initial speed and the detected temperature includes:

[0016] If the initial speed is not zero, the speed of the fan is adjusted according to the detected temperature every time a first preset time threshold is reached; and

[0017] When the initial gear is zero, the gear of the fan is adjusted according to the detected temperature every second preset time threshold.

[0018] Wherein, the second preset time threshold is less than the first preset time threshold.

[0019] In some embodiments, the process of adjusting the fan speed based on the detected temperature includes:

[0020] The detected temperature is compared with the preset safe temperature to obtain comparison information; and

[0021] The speed of the fan is adjusted based on the comparison information.

[0022] The preset safe temperature is obtained based on the outdoor temperature.

[0023] In some embodiments, the process of adjusting the speed of the fan based on the comparison information includes:

[0024] If the detected temperature is not greater than the difference between the preset safe temperature and the first preset adjustment value, the fan speed is reduced by the first preset speed.

[0025] If the detected temperature is greater than the difference between the preset safe temperature and the first preset adjustment value, but not greater than the preset safe temperature, the fan speed is reduced by a second preset speed; and

[0026] If the detected temperature is greater than the preset safe temperature but not greater than the sum of the preset safe temperature and the first preset adjustment value, the fan speed remains unchanged.

[0027] In some embodiments, the process of adjusting the speed of the fan based on the comparison information includes:

[0028] If the detected temperature is greater than the sum of the preset safe temperature and the first preset adjustment value, but not greater than the sum of the preset safe temperature and the second preset adjustment value, the fan speed is increased by the first preset speed; and

[0029] If the detected temperature is less than the sum of the preset safe temperature and the second preset adjustment value, the fan speed is adjusted to the maximum preset speed.

[0030] In some embodiments, after determining the initial speed of the fan based on the outdoor temperature and the target frequency, the control method further includes:

[0031] The fan is controlled to operate at the initial speed within a third preset time threshold.

[0032] An embodiment of the second aspect of this application provides a control device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the control method of the heat recovery system as described above.

[0033] A third aspect of this application provides an air conditioner that includes the control device described above.

[0034] A fourth aspect of this application provides a computer-readable storage medium storing computer-executable instructions for performing the control method of the heat recovery system described above.

[0035] Other features and advantages of this application will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the application. The objectives and other advantages of this application may be realized and obtained by means of the structures particularly pointed out in the description, claims and drawings. Attached Figure Description

[0036] Figure 1 is a schematic diagram of the system structure of the heat recovery system provided in an embodiment of this application;

[0037] Figure 2 is a flowchart of a control method applied to a heat recovery system provided in an embodiment of this application;

[0038] Figure 3 is a flowchart of a method for determining the initial speed of a fan according to an embodiment of this application;

[0039] Figure 4 is a flowchart of a method for adjusting the speed of a fan according to an embodiment of this application;

[0040] Figure 5 is a flowchart of a specific method for adjusting the speed of a fan according to an embodiment of this application;

[0041] Figure 6 is a flowchart of a method for adjusting the speed of a fan based on comparison information according to an embodiment of this application;

[0042] Figure 7 is a flowchart of a method for adjusting the speed of a fan based on comparison information according to another embodiment of this application;

[0043] Figure 8 is a flowchart of a control method applied to a heat recovery system according to another embodiment of this application;

[0044] Figure 9 is a schematic diagram of determining a preset safe temperature based on outdoor temperature according to an embodiment of this application;

[0045] Figure 10 is a schematic diagram of the structure of the control device provided in an embodiment of this application.

[0046] Reference numerals: Indoor heat exchanger 100, Outdoor heat exchanger 200, Water tank 300, Compressor 400, Four-way valve 500, Main electronic expansion valve 600, Sub-electronic expansion valve 700, First electronic expansion valve 800. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various implementations. Simultaneously, the steps or actions described in the method description can be rearranged or adjusted in a manner readily apparent to those skilled in the art. Therefore, the various orders in the specification and drawings are merely for the clear description of a particular embodiment and do not imply a mandatory order, unless otherwise stated that a particular order must be followed.

[0048] In the description of this application, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0049] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0050] It should be noted that the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0051] A heat recovery air conditioner is an air conditioner that can simultaneously meet the needs of conventional hot water production and air conditioning / heating. It can operate in scenarios where each component runs independently or simultaneously, and in the simultaneous operation scenario, it can operate in partial heat recovery and full heat recovery modes. When cooling and hot water production are activated simultaneously, if the cooling and hot water demands match, the heat recovery air conditioner can enter full heat recovery mode. In this mode, the water tank acts as the condenser, and the indoor unit acts as the evaporator. The outdoor unit condenser does not participate in heat exchange, and the refrigerant does not need to flow through it. In this mode, the fan control is unrelated to the condensing temperature but is related to the heat dissipation of the electronic control module. However, current fan control systems do not consider the heat dissipation of the electronic control module, leading to a shortened motor life and higher overall energy consumption.

[0052] Based on this, embodiments of this application provide a control method, control device, air conditioner, and computer-readable storage medium for a heat recovery system, which enables more intelligent control of the fan when the heat recovery system is in full heat recovery mode, not only preventing the electrical control module from overheating, but also saving energy.

[0053] The following explanation is based on the accompanying diagram:

[0054] Referring to Figure 1, an embodiment of this application provides a heat recovery system, which includes multiple indoor heat exchange devices 100, an outdoor heat exchange device 200, a valve assembly, a compressor 400, a four-way valve 500, and a water tank 300. The compressor 400 is connected to the water tank 300 through the four-way valve 500, the water tank 300 is connected to the multiple indoor heat exchange devices 100 through the valve assembly, the multiple indoor heat exchange devices 100 are connected to the four-way valve 500, the water tank 300 is also connected to the outdoor heat exchange device 200 through the valve assembly, and the outdoor heat exchange device 200 is connected to the four-way valve 500. The valve assembly includes a main electronic expansion valve 600 and multiple sub-electronic expansion valves 700. The water tank 300 is connected to the outdoor heat exchange equipment 200 through the main electronic expansion valve 600, and the water tank 300 is also connected to each indoor heat exchange equipment 100 through the sub-electronic expansion valves 700. When the heat recovery system is in full heat recovery mode, the refrigerant is compressed by the compressor 400 and enters the water tank 300 through the four-way valve 500 for heat exchange and condensation, thereby heating the water in the water tank 300. Since the sub-electronic expansion valves 700 in the valve assembly are in the open state and the main electronic expansion valve 600 is in the closed state, the condensed refrigerant enters each indoor heat exchange equipment 100 through the sub-electronic expansion valves 700 for evaporation to form gaseous refrigerant, and finally re-enters the compressor 400 through the four-way valve 500, forming a cycle. Since the main electronic expansion valve 600 is closed, the condensed refrigerant will not enter the outdoor heat exchanger 200 through the main electronic expansion valve 600. At this time, the water tank 300 acts as a condensing component, cooling the high-temperature refrigerant while heating, thus achieving heat recovery and improving energy utilization efficiency, thereby enhancing the energy efficiency of the heat recovery system. In this mode, the main electronic expansion valve 600 is closed, the refrigerant does not flow through the outdoor heat exchanger 200, and the outdoor heat exchanger 200 does not need to participate in heat exchange. Under such circumstances, the fan speed is irrelevant to the heat exchange efficiency of the indoor heat exchanger 100. At this time, the fan control is irrelevant to the condensing temperature. What needs to be adjusted by the fan is no longer the heat exchange effect of the outdoor heat exchanger 200, but the electrically controlled heating components. In the embodiments of this application, the indoor heat exchanger 100 can be an evaporator, the outdoor heat exchanger 200 can be a condenser, and a fan is also provided at the location of the condenser.

[0055] It is worth noting that the heat recovery system may include multiple indoor heat exchange devices 100, and each indoor heat exchange device 100 is equipped with a sub-electronic expansion valve 700 at its refrigerant inlet. The sub-electronic expansion valve 700 can control the refrigerant flow rate input to the corresponding indoor heat exchange device 100. The refrigerant outlet of the water tank 300 can also be connected to each sub-electronic expansion valve 700 and the main electronic expansion valve 600 through a first electronic expansion valve 800. By controlling the first electronic expansion valve 800, the refrigerant flow rate input to each sub-electronic expansion valve 700 can be controlled.

[0056] Secondly, embodiments of this application provide a control method for a heat recovery system, which is applied to the heat recovery system described in the above embodiments, for example, to the heat recovery system shown in FIG1. ​​Referring to FIG2, the control method may include, but is not limited to, steps S100, S200 and S300.

[0057] Step S100: Obtain the outdoor temperature, the target frequency of the compressor, and the detection temperature of the electronically controlled heating components;

[0058] Step S200: Determine the initial speed of the fan based on the outdoor temperature and target frequency;

[0059] Step S300: Adjust the fan speed according to the initial speed and the detected temperature.

[0060] According to the control method provided in this embodiment of the invention, the outdoor ambient temperature can be detected by a temperature sensor installed on the outdoor heat exchange equipment. The user can set the frequency of the compressor in the heat recovery system through a control terminal. This setting can be done before shipment or according to actual needs, thereby obtaining the target frequency of the compressor. The temperature of the electrically controlled heating components can also be obtained by detecting the temperature. In the process of controlling the fan, the fan first needs to be initialized so that it can operate at its initial speed. The initial speed of the fan can be determined based on the outdoor temperature and the target frequency; the higher the outdoor temperature and the higher the target frequency, the higher the initial speed of the fan and the faster its rotation speed. Finally, the fan speed can be adjusted based on the initial speed determined during fan initialization and the detected temperature of the electrically controlled heating components. Through the above technical solution, the heat recovery system operates in a full heat recovery mode, enabling intelligent adjustment of the fan in the outdoor heat exchange equipment. This not only effectively prevents the temperature of the electrically controlled heating components from becoming too high but also achieves energy-saving and environmental protection requirements.

[0061] It's important to note that compressor speed refers to the number of times the compressor rotates per minute, measured in revolutions per minute (rpm). Frequency refers to the number of cycles per second, measured in Hertz (Hz). In three-phase power supplies, the frequency is typically 50Hz or 60Hz. Domestic variable frequency compressors generally operate between 20-120Hz. The rated frequency of an AC variable frequency compressor is 90Hz; operating above this frequency can easily lead to motor burnout. 50Hz is simply a more stable operating frequency. The compressor's frequency variation is primarily directly related to the voltage.

[0062] It is worth noting that electrically controlled heating components can include Intelligent Power Modules (IPMs), Insulated Gate Bipolar Transistors (IGBTs), and bridge rectifier modules. Among them, IPMs utilize IGBTs as power switching devices, possessing the advantages of high current density, low saturation voltage, and high voltage resistance of high-power transistors, as well as the advantages of high input impedance, high switching frequency, and low drive power of field-effect transistors. IPMs integrate logic, control, detection, and protection circuits, making them easy to use. This not only reduces system size and development time but also significantly enhances system reliability, aligning with the current development trend of power devices—modularization, composite design, and power integrated circuits—and leading to their increasingly widespread application in power electronics. The built-in drive and protection circuits of IPMs simplify and improve the reliability of the system hardware, shortening system development time and enhancing self-protection capabilities under fault conditions. Compared to ordinary IGBT modules, IPMs offer further improvements in system performance and reliability. IGBT modules are composite, fully controllable, voltage-driven power semiconductor devices composed of bipolar junction transistors (BJTs) and insulated-gate field-effect transistors (IGFETs). They combine the advantages of high input impedance of IGFETs and low on-state voltage drop of BJTs. BJTs have low saturation voltage drop and high current density, but require relatively large drive current. IGBTs have very low drive power and fast switching speed, but high on-state voltage drop and low current density. Bridge rectifier modules can convert AC to DC. They consist of four diodes, more precisely two anti-parallel diodes and two forward-parallel diodes. This design allows AC to be fully rectified and output as DC when passing through the bridge rectifier.

[0063] It should be noted that the formula for calculating the fan speed in the embodiments of this application can be: actual fan speed / set maximum fan speed * maximum number of speeds N; the set maximum fan speed and the total number of speeds are both parameter values ​​and can be set according to the actual situation. For example, if the maximum speed is 1000 rpm and the maximum fan speed is 10, then the corresponding X value is a positive integer between [0, 10], and the corresponding fan speed is 0, 100, 200, ..., 1000 rpm.

[0064] Referring to Figure 3, the process of determining the initial speed of the fan based on the outdoor temperature and the target frequency may include, but is not limited to, steps S210 and S220.

[0065] Step S210: Determine temperature range information based on outdoor temperature and preset temperature range; and determine frequency range information based on target frequency and preset frequency range.

[0066] Step S220: Determine the initial gear based on the temperature range information and frequency range information.

[0067] According to the control method provided in this embodiment of the invention, in the process of determining the initial speed of the fan based on the outdoor temperature detected by the outdoor temperature sensor and the target frequency of the compressor in the heat recovery system, the outdoor temperature is first compared with a preset temperature division interval to determine which interval the current outdoor temperature falls within, so as to obtain the corresponding temperature interval information; the target frequency of the compressor is also compared with a preset frequency division interval to determine which interval the current target frequency falls within, so as to obtain the corresponding frequency interval information; finally, the initial speed of the fan can be determined based on the temperature interval information and frequency interval information obtained above, so that the fan can operate at the initial speed.

[0068] For example, as shown in the table below:

[0069] It is worth noting that, as shown in the table above, the higher the target frequency of the compressor, the higher the initial speed of the fan, and the faster the fan speed; the higher the outdoor temperature, the higher the initial speed of the fan, and the faster the fan speed. For the compressor's target frequency, X_11≤X_12≤X_13≤X_14≤X_15; for the outdoor temperature, X_11≤X_21≤X_31≤X_41≤X_51≤X_61≤X_71. For example, if the compressor's target frequency is 50Hz and the current outdoor temperature is 18℃, since 50Hz falls within the range [40, 60) and 18℃ falls within the range 12<T4≤20, the table indicates that the fan's initial speed is X_33. Therefore, the fan can be controlled to operate at speed X_33 initially.

[0070] Referring to Figure 4, the process of controlling and adjusting the fan speed according to the initial speed and the detected temperature may include, but is not limited to, steps S310 and S320.

[0071] Step S310: If the initial gear is not zero, adjust the gear of the fan according to the detected temperature every time the first preset time threshold is reached.

[0072] In step S320, when the initial gear is zero, the gear of the fan is adjusted according to the detected temperature every second preset time threshold.

[0073] According to the control method provided in this embodiment of the invention, when the initial gear is determined to be non-zero, the fan gear can be controlled and adjusted based on the detected temperature of the electrically controlled heating element each time a first preset time threshold is reached; when the initial gear is determined to be zero, the fan gear can be controlled and adjusted based on the detected temperature of the electrically controlled heating element each time a second preset time threshold is reached. The second preset time threshold is smaller than the first preset time threshold, and the shorter cycle is to prevent a sudden temperature spike in the electrically controlled heating element when the fan is stopped.

[0074] For example, the second preset time threshold is 20 seconds and the first preset time threshold is 40 seconds. When the initial gear is 2, the fan speed can be adjusted every 40 seconds based on the detected temperature obtained from the electronically controlled heating element. When the initial gear is 0, the fan is in a stopped state, and the fan speed can be adjusted every 20 seconds based on the detected temperature obtained from the electronically controlled heating element. The shortened cycle can effectively prevent the temperature of the electronically controlled heating element from soaring, thus improving safety.

[0075] Referring to Figure 5, the process of adjusting the fan speed according to the detected temperature may include, but is not limited to, steps S311 and S312.

[0076] Step S311: Compare the detected temperature with the preset safe temperature to obtain comparison information;

[0077] Step S312: Adjust the fan speed according to the comparison information.

[0078] According to the control method provided in the embodiments of the present invention, in the process of controlling and adjusting the fan speed based on the detected temperature, a safe temperature can be set first according to actual needs. Then, the detected temperature is compared with the preset safe temperature to determine the difference between the detected temperature and the preset safe temperature, thereby obtaining comparison information. Finally, the fan speed of the heat recovery system can be adjusted based on the comparison information, thereby realizing the adjustment and control of the fan speed.

[0079] It is worth noting that the preset safe temperature can be determined based on prior testing. Setting the preset safe temperature allows the subsequent fan speed control to be based on the detected temperature of the electronically controlled heating components, effectively preventing the electronically controlled heating components from overheating. Furthermore, it can reduce the fan speed when the temperature is relatively low, thereby achieving the requirements of energy saving and environmental protection.

[0080] It is worth noting that the preset safe temperature can be determined by the outdoor temperature; for example, the outdoor temperature is divided into different temperature ranges, and for each temperature range, there is a corresponding preset safe temperature, so the corresponding preset safe temperature can be determined based on the outdoor temperature.

[0081] Referring to Figure 6, the process of controlling the fan speed based on the comparison information may include, but is not limited to, steps S3121, S3122, and S3123.

[0082] Step S3121: If the detected temperature is not greater than the difference between the preset safe temperature and the first preset adjustment value, reduce the fan speed to the first preset speed.

[0083] Step S3122: If the detected temperature is greater than the difference between the preset safe temperature and the first preset adjustment value, but not greater than the preset safe temperature, reduce the fan speed to the second preset speed.

[0084] Step S3123: If the detected temperature is greater than the preset safe temperature but not greater than the sum of the preset safe temperature and the first preset adjustment value, the fan speed is kept unchanged.

[0085] According to the control method provided in this embodiment of the invention, when the detected temperature of the electrically controlled heating element is less than or equal to the difference between a preset safe temperature and a first preset adjustment value, the fan speed needs to be reduced, causing the fan speed to decrease to a first preset level. When the detected temperature of the electrically controlled heating element is greater than the difference between the preset safe temperature and the first preset adjustment value, but less than or equal to the preset safe temperature, the fan speed needs to be reduced, causing the fan speed to decrease to a second preset level. When the detected temperature of the electrically controlled heating element is greater than the preset safe temperature, but less than or equal to the sum of the preset safe temperature and the first preset adjustment value, the fan speed can be kept constant, thus keeping the fan speed unchanged. Through the above control processing, the fan speed can be adjusted according to the actual cooling needs, effectively achieving energy-saving and environmental protection requirements.

[0086] Referring to Figure 7, the process of controlling the fan speed based on the comparison information may include, but is not limited to, steps S3124 and S3125.

[0087] Step S3124: If the detected temperature is greater than the sum of the preset safe temperature and the first preset adjustment value, but not greater than the sum of the preset safe temperature and the second preset adjustment value, increase the fan speed by the first preset speed.

[0088] Step S3125: If the detected temperature is less than the sum of the preset safe temperature and the second preset adjustment value, adjust the fan speed to the maximum preset speed.

[0089] According to the control method provided in this embodiment of the invention, when the detected temperature of the electrically controlled heating element is greater than the sum of the preset safe temperature and the first preset adjustment value, and less than or equal to the sum of the preset safe temperature and the second preset adjustment value, it is necessary to increase the speed of the fan and raise the fan speed to the first preset level. When the sum of the preset safe temperature and the second preset adjustment value is greater than the detected temperature of the electrically controlled heating element, the fan speed can be adjusted to the fastest state and the fan speed can be adjusted to the maximum preset level, thereby accelerating heat dissipation, effectively preventing the electrically controlled heating element from overheating, improving safety, and protecting the electrically controlled heating element.

[0090] Referring to Figure 8, after step S200 is completed, steps S410 and S420 may also be performed.

[0091] Step S410: Determine the initial speed of the fan;

[0092] Step S420: Control the fan to run at the initial speed within the third preset time threshold.

[0093] According to the control method provided in the embodiments of the present invention, after determining the initial gear of the fan, the fan can be made to run at the determined initial gear for a third preset time threshold to realize the initial control process of the fan. For example, the third preset time threshold is 2 minutes. After determining that the initial gear of the fan is 5, the fan can be made to run at gear 5 for 2 minutes to realize the initial control process of the fan.

[0094] To more clearly illustrate the process of controlling the fan speed based on comparison information, a specific implementation method is described below. This is done during the temperature regulation control of the IPM module.

[0095] After initialization, if the windshield X ≠ 0, the external fan is adjusted every t2 time (parameter, for example, t2 = 40s). If the windshield X = 0, the external fan is adjusted every t2 time (parameter, for example, t2 = 20s). The shorter cycle is to prevent the sudden rise of the electronic control temperature when the fan is in the stop state. Adjustment method: the current fan gear X = the original gear X + the changed gear △X.

[0096] Among them, the changed gear △X is controlled according to the following table:

[0097] IPM_Temp is the actual temperature detected by the IPM module in real time, and IPM_TempS is the set safety temperature of the IPM module.

[0098] Referring to Figure 9, IPM_TempS takes different values according to different T4 temperature ranges (the higher the T4 temperature, the higher the set safety temperature of the IPM module). Determine the set safety temperature of the IPM module according to the temperature range shown in Figure 9, and setting the dead zone can well prevent the back-and-forth fluctuation in different intervals caused by the T4 detection deviation. Among them, T4 is the outdoor temperature.

[0099] The value range of the windshield X is [0, N1], N1 is the maximum gear allowed to operate, and N1 ≤ the maximum number of gears N.

[0100] The value of N1 is related to the T4 temperature. The higher the T4, the larger N1. For example: (1) If T4 > 45, then N1 takes 10; (2) If 38 < T4 ≤ 45, then N1 takes 9; (3) If T4 ≤ 38°C, then N1 takes 8. Among them, T4 is the outdoor temperature.

[0101] Exemplarily, IPM_TempS is 40°C and IPM_Temp is 33°C. At this time, IPM_Temp ≤ IPM_TempS - 5. Therefore, the gear of the fan needs to be reduced by 2 gears, and then the IPM module is detected continuously. The updated IPM_Temp is compared with IPM_TempS continuously, so as to continue to control and adjust the gear of the fan.

[0102] Through the above technical solutions, the initial operating windshield of the fan is quickly determined by the frequency and the T4 temperature, reducing the subsequent adjustment process of the fan; through the temperature adjustment of the IPM module, when the temperature of the IPM module is high, the rotation speed is quickly increased to prevent the device from being damaged due to excessive module temperature. When the temperature of the IPM module is low, the rotation speed of the fan is quickly reduced to reduce the power consumption of the system in the full heat recovery mode and improve the operating energy efficiency of the system.

[0103] Referring to FIG10, an embodiment of this application also provides a control device 1000, including a memory 1200, a processor 1100, and a computer program stored in the memory 1200 and executable on the processor 1100. When the processor 1100 executes the computer program, it implements the control method of the heat recovery system as described in the above embodiment.

[0104] Furthermore, embodiments of this application also provide an air conditioner, which includes the control device described above.

[0105] Furthermore, embodiments of this application also provide a computer-readable storage medium storing computer-executable instructions for executing the control method of the heat recovery system described above.

[0106] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate; that is, they may be located in one place or distributed across multiple network nodes. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0107] Those skilled in the art will understand that all or some of the steps and systems in the methods disclosed above can be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components can be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which can include computer-readable storage media (or non-transitory media) and communication media (or transient media). As is known to those skilled in the art, the term computer-readable storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer-readable storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disc (DVD) or other optical disc storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and is accessible to a computer. Furthermore, as is known to those skilled in the art, communication media typically contain computer-readable instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.

[0108] The above is a detailed description of the preferred embodiments of this application. However, this application is not limited to the above embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of this application. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A control method for a heat recovery system, wherein, The heat recovery system includes a compressor, a fan, and electrically controlled heating components, and the control method includes: The outdoor temperature, the target frequency of the compressor, and the detection temperature of the electronically controlled heating element are obtained. The initial speed of the fan is determined based on the outdoor temperature and the target frequency; and The fan speed is adjusted according to the initial speed and the detected temperature.

2. The control method according to claim 1, wherein, Determining the initial speed of the fan based on the outdoor temperature and the target frequency includes: Temperature range information is determined based on the outdoor temperature and a preset temperature range; and frequency range information is determined based on the target frequency and a preset frequency range; and The initial gear is determined based on the temperature range information and the frequency range information.

3. The control method according to claim 1 or 2, wherein, The process of adjusting the fan speed based on the initial speed and the detected temperature includes: If the initial speed is not zero, the speed of the fan is adjusted according to the detected temperature every time a first preset time threshold is reached; and When the initial gear is zero, the gear of the fan is adjusted according to the detected temperature every second preset time threshold. Wherein, the second preset time threshold is less than the first preset time threshold.

4. The control method according to claim 3, wherein, The process of adjusting the fan speed based on the detected temperature includes: The detected temperature is compared with the preset safe temperature to obtain comparison information; and The speed of the fan is adjusted based on the comparison information. The preset safe temperature is obtained based on the outdoor temperature.

5. The control method according to claim 4, wherein, The step of adjusting the speed of the fan based on the comparison information includes: If the detected temperature is not greater than the difference between the preset safe temperature and the first preset adjustment value, the fan speed is reduced by the first preset speed. If the detected temperature is greater than the difference between the preset safe temperature and the first preset adjustment value, but not greater than the preset safe temperature, the fan speed is reduced by a second preset speed; and If the detected temperature is greater than the preset safe temperature but not greater than the sum of the preset safe temperature and the first preset adjustment value, the fan speed remains unchanged.

6. The control method according to claim 4 or 5, wherein, The step of adjusting the speed of the fan based on the comparison information includes: If the detected temperature is greater than the sum of the preset safe temperature and the first preset adjustment value, but not greater than the sum of the preset safe temperature and the second preset adjustment value, the fan speed is increased by the first preset speed; and If the detected temperature is less than the sum of the preset safe temperature and the second preset adjustment value, the fan speed is adjusted to the maximum preset speed.

7. The control method according to any one of claims 1 to 6, wherein, After determining the initial speed of the fan based on the outdoor temperature and the target frequency, the control method further includes: The fan is controlled to operate at the initial speed within a third preset time threshold.

8. A control device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement a control method for a heat recovery system as claimed in any one of claims 1 to 7.

9. An air conditioner comprising the control device of claim 8.

10. A computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are configured to perform a control method for a heat recovery system as claimed in any one of claims 1 to 7.

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