Frequency control method of compressor, controller, heat pump water chiller-heater unit and medium

Abstract

The embodiment of the invention provides a frequency control method of a compressor, a controller, a heat pump water chiller-heater unit and a medium, and the frequency control method of the compressor is applied to the heat pump water chiller-heater unit. Firstly, the communication state between an outdoor unit and a hydraulic module is obtained; then, when the outdoor unit and the hydraulic module have communication faults, communication abnormal time and state parameters of a compressor are obtained; and then, the operation frequency of the compressor is controlled according to the communication abnormal time and the state parameters. According to the embodiment of the invention, the operation frequency of the compressor can be adjusted according to the communication abnormal time and the state parameters of the compressor before the outdoor unit stops operating the compressor without confirming the communication fault, so that the operation frequency of the compressor is prevented from being too high or the compressor is controlled to reduce the frequency slowly; therefore, the problem that the evaporation temperature of the system is too low is reduced, and then the risk of icing crack leakage in the water-fluorine heat exchanger can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of air conditioning, and particularly relates to a frequency control method for a compressor, a controller, a heat pump cold and hot water unit, and a medium. Background Art

[0002] In the related art, a heat pump cold and hot water unit usually includes an outdoor unit and a hydraulic module. The two communicate with each other to achieve information interaction and control their respective loads. When the hydraulic module and the outdoor unit cannot communicate for a long time, the system will maintain the current state according to the latest information detected currently until it is confirmed that the communication fault detection time is satisfied, and the unit communication fault is determined before performing a shutdown process.

[0003] In the existing technical solution, if the outdoor compressor is running at a high frequency during the refrigeration operation of the heat pump cold and hot water unit, and at this time the entire water circulation system has an abnormality resulting in a small water flow, the compressor frequency needs to be reduced. However, due to the sudden communication abnormality between the hydraulic module and the outdoor unit and the inability to transmit information in time, the compressor cannot reduce its frequency and still runs at a high frequency, which may cause the system evaporation temperature to be too low and the water side of the water-fluorine heat exchanger to freeze, thus leading to the risk of leakage of the water-fluorine heat exchanger. Summary of the Invention

[0004] The present application aims to at least solve one of the technical problems existing in the prior art. For this purpose, the present application provides a frequency control method for a compressor, a controller, a heat pump cold and hot water unit, and a medium, aiming to reduce the risk of leakage of the water-fluorine heat exchanger in the case of communication abnormality between the hydraulic module and the outdoor unit.

[0005] In a first aspect, an embodiment of the present application provides a frequency control method for a compressor, which is applied to a heat pump cold and hot water unit. The heat pump cold and hot water unit includes an outdoor unit and a hydraulic module, and the outdoor unit and the hydraulic module are communicatively connected. The hydraulic module is used to supply the water heated by the outdoor unit to an indoor heat exchange device. The frequency control method includes:

[0006] Obtain the communication state between the outdoor unit and the hydraulic module;

[0007] When there is a communication fault between the outdoor unit and the hydraulic module, obtain the communication abnormal time and the state parameters of the compressor;

[0008] Control the operating frequency of the compressor according to the communication abnormal time and the state parameters.

[0009] According to some embodiments of the present application, the state parameters include the current operating frequency. The controlling the operating frequency of the compressor according to the communication abnormal time and the state parameters includes:

[0010] When the communication abnormal time is greater than a first preset time, control the operating frequency of the compressor according to the current operating frequency and the preset frequency.

[0011] According to some embodiments of the present application, adjusting the operating frequency of the compressor according to the current operating frequency and the preset frequency includes one of the following:

[0012] When the current operating frequency is greater than the preset frequency, use the preset frequency as the operating frequency of the compressor;

[0013] When the current operating frequency is less than or equal to the preset frequency, correct the current operating frequency according to a preset first correction value to reduce the operating frequency of the compressor.

[0014] According to some embodiments of the present application, the state parameter includes a first exhaust parameter change value; controlling the operating frequency of the compressor according to the communication abnormal time and the state parameter further includes:

[0015] When the communication abnormal time is greater than a second preset time, control the operating frequency of the compressor according to the first exhaust parameter change value and a first preset change threshold, where the second preset time is greater than the first preset time.

[0016] According to some embodiments of the present application, controlling the operating frequency of the compressor according to the first exhaust parameter change value and the first preset change threshold includes one of the following:

[0017] When the first exhaust parameter change value is greater than the first preset change threshold, correct the operating frequency of the compressor according to a preset second correction value to reduce the operating frequency of the compressor;

[0018] When the first exhaust parameter change value is less than or equal to the first preset change threshold, keep the operating frequency of the compressor unchanged.

[0019] According to some embodiments of the present application, the first exhaust parameter change value is obtained through the following steps:

[0020] When the communication abnormal time reaches the first preset time, obtain the first exhaust parameter of the compressor;

[0021] When the communication abnormal time reaches the second preset time, obtain the second exhaust parameter of the compressor;

[0022] Take the difference between the second exhaust parameter and the first exhaust parameter as the first exhaust parameter change value.

[0023] According to some embodiments of the present application, the state parameter further includes a second exhaust parameter change value; and the controlling the operating frequency of the compressor according to the communication abnormal time and the state parameter further includes:

[0024] When the communication abnormal time is greater than a third preset time, controlling the operating frequency of the compressor according to the second exhaust parameter change value and a second preset change threshold, wherein the third preset time is greater than the second preset time.

[0025] According to some embodiments of the present application, the controlling the operating frequency of the compressor according to the second exhaust parameter change value and the second preset change threshold includes one of the following:

[0026] When the second exhaust parameter change value is greater than the second preset change threshold, controlling the compressor to stop operating;

[0027] When the second exhaust parameter change value is less than or equal to the second preset change threshold, reducing the operating frequency of the compressor to a preset minimum allowable operating frequency.

[0028] According to some embodiments of the present application, after reducing the operating frequency of the compressor to the preset minimum allowable operating frequency, the frequency control method further includes one of the following:

[0029] When the communication abnormal time is greater than a preset communication fault detection time, controlling the compressor to stop operating;

[0030] When the communication abnormal time is less than or equal to the preset communication fault detection time, keeping the operating frequency of the compressor unchanged.

[0031] According to some embodiments of the present application, the second exhaust parameter change value is obtained through the following steps:

[0032] When the communication abnormal time reaches the second preset time, obtaining the second exhaust parameter of the compressor;

[0033] When the communication abnormal time reaches the third preset time, obtaining the third exhaust parameter of the compressor;

[0034] Taking the difference between the third exhaust parameter and the second exhaust parameter as the second exhaust parameter change value.

[0035] According to some embodiments of the present application, the first exhaust parameter change value and / or the second exhaust parameter change value includes one of the following: exhaust temperature change value, exhaust pressure change value.

[0036] In a second aspect, an embodiment of the present application further provides a controller, including: a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor runs the computer program, it executes the frequency control method of the compressor as described in the first aspect above.

[0037] In a third aspect, an embodiment of the present application provides a heat pump cold and hot water unit, including the controller as described in the second aspect above.

[0038] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium storing computer-executable instructions for executing the frequency control method of the compressor as described in the first aspect above.

[0039] According to the technical solution of the embodiment of the present application, there are at least the following beneficial effects: First, the embodiment of the present application will obtain the communication status between the outdoor unit and the hydraulic module; then, when there is a communication failure between the outdoor unit and the hydraulic module, the embodiment of the present application will obtain the communication abnormal time and the state parameters of the compressor; then, the embodiment of the present application will control the operating frequency of the compressor according to the communication abnormal time and the state parameters. The embodiment of the present application can adjust the operating frequency of the compressor according to the length of the communication abnormal time and the magnitude of the compressor state parameters before the outdoor unit confirms the communication failure and stops running the compressor, avoiding the operating frequency of the compressor being too high or controlling the compressor to slow down the frequency, thereby reducing the problem of too low system evaporation temperature, and further reducing the risk of ice cracking and leakage inside the water-fluorine heat exchanger.

[0040] The additional aspects and advantages of the present application will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present application. Description of the Drawings

[0041] The drawings are used to provide a further understanding of the technical solution of the present application, and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present application, and do not constitute a limitation to the technical solution of the present application.

[0042] Figure 1 It is a schematic structural diagram of a heat pump cold and hot water unit provided by an embodiment of the present application;

[0043] Figure 2 It is a flowchart of the frequency control method of the compressor provided by an embodiment of the present application;

[0044] Figure 3 It is a flowchart of the frequency control method of the compressor provided by another embodiment of the present application;

[0045] Figure 4 It is a flowchart of the frequency control method of the compressor provided by another embodiment of the present application;

[0046] Figure 5 is a flowchart of a frequency control method for a compressor provided by another embodiment of the present application;

[0047] Figure 6 is a flowchart of a frequency control method for a compressor provided by another embodiment of the present application;

[0048] Figure 7 is a flowchart of a frequency control method for a compressor provided by another embodiment of the present application;

[0049] Figure 8 is a flowchart of a frequency control method for a compressor provided by another embodiment of the present application;

[0050] Figure 9 is a flowchart of a frequency control method for a compressor provided by another embodiment of the present application;

[0051] Figure 10 is a flowchart of a frequency control method for a compressor provided by another embodiment of the present application;

[0052] Figure 11 is a flowchart of a frequency control method for a compressor provided by another embodiment of the present application;

[0053] Figure 12 is the overall flowchart of a frequency control method for a compressor provided by an embodiment of the present application;

[0054] Figure 13 is a schematic diagram of a controller for executing a frequency control method for a compressor provided by an embodiment of the present application. Detailed Description of the Embodiment

[0055] The embodiments of the present application will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present application and should not be construed as a limitation to the present application.

[0056] In the description of the present application, it should be understood that for the orientation description, such as the orientation or positional relationship indicated by up, down, front, back, left, right, etc., is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0057] In the description of the present application, the meaning of "several" is one or more, the meaning of "multiple" is more than two, and understandings such as "greater than", "less than", "exceeding", etc. do not include the corresponding number, while understandings such as "above", "below", "within", etc. include the corresponding number. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0058] In the description of the present application, unless otherwise clearly defined, terms such as "set", "installed", "connected", etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present application in combination with the specific content of the technical solution.

[0059] In some cases, a heat pump chiller usually includes an outdoor unit and a hydraulic module, and the two achieve information interaction through communication connection and control their respective loads. When the hydraulic module and the outdoor unit cannot communicate for a long time, the system will maintain the current state of operation according to the latest information obtained by current detection until it is confirmed that the communication fault detection time is met, and the unit communication fault is determined before performing a shutdown process.

[0060] In the existing technical solution, during the refrigeration operation of a heat pump chiller, if the outdoor compressor is operating at a high frequency, and at this time, the entire water circulation system has an abnormality resulting in a small water flow, it is necessary to reduce the compressor frequency. However, due to a sudden communication abnormality between the hydraulic module and the outdoor unit, information cannot be transmitted in a timely manner, and the compressor cannot reduce its frequency and still operates at a high frequency, which may cause the evaporation temperature of the system to be too low and the water side of the water-fluorine heat exchanger to freeze, thereby leading to the risk of leakage of the water-fluorine heat exchanger.

[0061] Based on the above situation, the embodiments of the present application propose a frequency control method for a compressor, a controller, a heat pump chiller, and a medium, aiming to reduce the risk of leakage of the water-fluorine heat exchanger in the case of communication abnormality between the hydraulic module and the outdoor unit.

[0062] The following further elaborates on each embodiment of the heat pump chiller of the present application with reference to the accompanying drawings.

[0063] As Figure 1 shown, Figure 1 is a schematic structural diagram of a heat pump chiller provided by an embodiment of the present application.

[0064] In one embodiment, the heat pump chiller of the embodiments of the present application includes, but is not limited to, an outdoor unit 100 and a hydraulic module 200. Among them, the hydraulic module 200 and the outdoor unit 100 are communicatively connected, and the hydraulic module 200 is used to supply the water heat-exchanged by the outdoor unit 100 to the indoor heat exchange equipment.

[0065] In addition, in one embodiment, information exchange can be carried out between the outdoor unit 100 and the hydraulic module 200, and linkage control can also be carried out. For example, the hydraulic module 200 can obtain parameters such as the water flow rate, inlet water temperature, or outlet water temperature of its inlet and outlet water, and send the above parameters to the outdoor unit 100. Then, the outdoor unit 100 can control the frequency of the compressor 110 based on the received parameters, such as increasing the frequency, decreasing the frequency, or maintaining the frequency unchanged.

[0066] It should be noted that regarding the above-mentioned outdoor unit 100 and hydraulic module 200, the two can be integrated into a single device, or they can be set separately. The embodiment of the present application does not specifically limit the structural manner between the outdoor unit 100 and the hydraulic module 200.

[0067] It can be understood that the communication method between the outdoor unit 100 and the hydraulic module 200 can be a wired communication method, such as power line carrier communication, etc.; it can also be a wireless communication method, such as WIFI communication or Bluetooth communication, etc. The embodiment of the present application does not specifically limit the communication method between the outdoor unit 100 and the hydraulic module 200.

[0068] In addition, in one embodiment, as Figure 1 shown, the outdoor unit 100 includes, but is not limited to, a compressor 110, a first heat exchanger 120, and a second heat exchanger 130. Among them, the compressor 110, the first heat exchanger 120, and the second heat exchanger 130 are connected through a refrigerant pipeline.

[0069] For Figure 1 the heat pump cold and hot water unit shown, when the heat pump cold and hot water unit is in the cooling mode, the first heat exchanger 120 serves as an evaporator, and the second heat exchanger 130 serves as a condenser; when the heat pump cold and hot water unit is in the heating mode, the first heat exchanger 120 serves as a condenser, and the second heat exchanger 130 serves as an evaporator.

[0070] It should be noted that regarding the above-mentioned first heat exchanger 120, it can specifically be a water-fluorine heat exchanger. Among them, the water-fluorine heat exchanger includes, but is not limited to, a first heat exchange coil and a second heat exchange coil. In addition, the second heat exchanger 130 includes, but is not limited to, a third heat exchange coil; the compressor 110, the first heat exchange coil, and the third heat exchange coil together form a circulation loop with fluorine as the refrigerant; the second heat exchange coil is connected to the indoor heat exchange device through the hydraulic module 200, and the second heat exchange coil, the hydraulic module 200, and the indoor heat exchange device together form another circulation loop with water as the refrigerant. Among them, the first heat exchange coil and the second heat exchange coil in the water-fluorine heat exchanger are not connected, and heat exchange can be carried out between the first heat exchange coil and the second heat exchange coil.

[0071] Specifically, when the heat pump cold and hot water unit is in the refrigeration mode, the first heat exchanger 120 acts as an evaporator. Since the fluorine refrigerant in the first heat exchange coil absorbs the heat from the water in the second heat exchange coil under the evaporation effect, the temperature of the water in the second heat exchange coil will drop and become cold water. Then, the hydraulic module 200 will supply the cold water to the indoor heat exchange equipment, so as to cool the indoor environment through the indoor heat exchange equipment.

[0072] In addition, when the heat pump cold and hot water unit is in the heating mode, the first heat exchanger 120 acts as a condenser. Since the fluorine refrigerant in the first heat exchange coil releases heat under the condensation effect and transfers the heat to the water in the second heat exchange coil, the temperature of the water in the second heat exchange coil will rise and become hot water. Then, the hydraulic module 200 will supply the hot water to the indoor heat exchange equipment, so as to heat the indoor environment through the indoor heat exchange equipment.

[0073] In one embodiment, as Figure 1 shown, the outdoor unit 100 further includes but is not limited to a four-way valve 140. The four-way valve 140 is provided with four ports. The first port is used to connect to the exhaust port of the compressor 110, the second port is used to connect to the first heat exchanger 120, the third port is used to connect to the second heat exchanger 130, and the third port is used to connect to the suction port of the compressor 110.

[0074] Specifically, the outdoor unit 100 can control the flow direction of the refrigerant by controlling the connection relationship of the four ports in the four-way valve 140, so as to change the heat exchange mode of the heat pump cold and hot water unit.

[0075] Among them, when the first port and the second port of the four-way valve 140 are connected, and the third port and the fourth port are connected, the heat pump cold and hot water unit is in the heating mode at this time. The refrigerant flow direction in the heating mode can be as shown by the solid arrows at the position of the outdoor unit 100 in Figure 1 . Specifically, the refrigerant from the exhaust port of the compressor 110 will pass through the four-way valve 140, the first heat exchanger 120 and the second heat exchanger 130 in sequence, and then return to the suction port of the compressor 110 through the four-way valve 140.

[0076] In addition, when the first port and the third port of the four-way valve 140 are connected, and the second port and the fourth port are connected, the heat pump cold and hot water unit is in the refrigeration mode at this time. The refrigerant flow direction in the refrigeration mode can be as shown by the dotted arrows at the position of the outdoor unit 100 in Figure 1 . Specifically, the refrigerant from the exhaust port of the compressor 110 will pass through the four-way valve 140, the second heat exchanger 130 and the first heat exchanger 120 in sequence, and then return to the suction port of the compressor 110 through the four-way valve 140.

[0077] In one embodiment, as Figure 1 shown, the outdoor unit 100 further includes, but is not limited to, a throttling component 150, wherein the throttling component 150 is disposed between the first heat exchanger 120 and the second heat exchanger 130.

[0078] It can be understood that regarding the above-mentioned throttling component 150, it can be an electronic expansion valve or a capillary tube. The embodiments of the present application do not specifically limit the type of the throttling component 150.

[0079] In one embodiment, for the second heat exchange coil of the water-fluorine heat exchanger, it is connected to the hydraulic module 200 and is connected to the indoor heat exchange device through the hydraulic module 200. Specifically, the hydraulic module 200 includes, but is not limited to, a water supply pipeline and a water return pipeline. The second heat exchange coil is connected to the water inlet of the indoor heat exchange device through the water supply pipeline, and is connected to the water outlet of the indoor heat exchange device through the water return pipeline. A water pump may also be provided on the water supply pipeline and / or the water return pipeline for supplying water to the indoor heat exchange device.

[0080] In addition, it can be understood that regarding the number of the above-mentioned indoor heat exchange devices, it can be two, three, or more. The embodiments of the present application do not specifically limit the number of the indoor heat exchange devices.

[0081] In addition, it should be noted that regarding the installation positions of the above-mentioned indoor heat exchange devices, multiple indoor heat exchange devices can be installed in the same spatial area. For example, multiple indoor heat exchange devices can be installed in a room at the same time, or multiple indoor heat exchange devices can be installed in a living room at the same time; in addition, multiple indoor heat exchange devices can also be installed in different spatial areas. For example, a part of the indoor heat exchange devices are installed in a room, and another part of the indoor heat exchange devices are installed in a living room, or a part of the indoor heat exchange devices are installed in the first room, and another part of the indoor heat exchange devices are installed in the second room. Regarding the installation positions of the above-mentioned indoor heat exchange devices, the embodiments of the present application do not specifically limit this.

[0082] In addition, it should be noted that regarding the installation positions of the indoor heat exchange devices in the spatial area, the embodiments of the present application can install the indoor heat exchange devices at the ceiling position of the room, or can install the indoor heat exchange devices at the floor position of the room, or can reasonably allocate the installation positions of the indoor heat exchange devices according to actual usage needs. The embodiments of the present application do not specifically limit this.

[0083] In addition, it should be noted that regarding the device types of the above-mentioned indoor heat exchange devices, they can be air handling unit terminals formed by matching with fan coils, or can be radiant terminals formed by matching with radiant panels, such as radiant panels on the ceiling or floor heating on the floor, or can be other types of terminal devices. The embodiments of the present application do not specifically limit this.

[0084] Based on the hardware structures of the heat pump chillers of the above various embodiments, the following are respectively presented various embodiments of the frequency control method of the compressor of the present application.

[0085] As Figure 2 shown, Figure 2 is a flowchart of the frequency control method of the compressor provided by an embodiment of the present application; this frequency control method can be applied to the heat pump chiller of the above embodiment, and can include but is not limited to step S210, step S220, and step S230.

[0086] Step S210: Obtain the communication status between the outdoor unit and the hydraulic module;

[0087] Step S220: When there is a communication fault between the outdoor unit and the hydraulic module, obtain the communication abnormal time and the state parameters of the compressor;

[0088] Step S230: Control the operating frequency of the compressor according to the communication abnormal time and the state parameters.

[0089] In one embodiment, first, the embodiment of the present application will detect the communication status between the hydraulic module and the outdoor unit. Among them, the communication status can include the normal communication status or the communication fault status; then, if it is detected that there is a communication fault between the hydraulic module and the outdoor unit, then at this time the outdoor unit may not be able to receive data such as the water flow rate or water temperature of the hydraulic module, so the outdoor unit cannot change its own operating state in a timely manner according to the data of the hydraulic module, which may cause the risk of leakage of the water-fluorine heat exchanger mentioned above; in this regard, the embodiment of the present application will time the communication abnormal time, that is, time the communication abnormal duration, and at the same time will also obtain the state parameters of the compressor; finally, the embodiment of the present application will adjust the operating frequency of the compressor based on the length of the communication abnormal time and the magnitude of the compressor state parameters, so as to reduce the risk of leakage of the water-fluorine heat exchanger caused by the compressor continuing to operate at a high frequency.

[0090] In addition, in one embodiment, if it is detected that the communication between the hydraulic module and the outdoor unit is normal, then at this time the outdoor unit can receive data such as the water flow rate or water temperature of the hydraulic module, and at this time the compressor will maintain the current frequency operation. Or, the compressor will adjust its own operating frequency based on the original control logic and the data feedback by the hydraulic module.

[0091] It should be noted that regarding the type of the above state parameters of the compressor, it can be the operating frequency of the compressor, or the exhaust parameters of the compressor, such as the exhaust temperature or exhaust pressure, or other parameters. The embodiment of the present application does not make a specific limitation on the type of the above state parameters of the compressor.

[0092] It should be noted that the embodiments of the present application can adjust the operating frequency of the compressor according to the length of the communication anomaly time and the magnitude of the compressor state parameters before the outdoor unit fails to confirm a communication fault and stops operating the compressor, avoiding the operating frequency of the compressor from being too high or controlling the compressor to slowly reduce the frequency, thereby reducing the problem of too low system evaporation temperature, and further being able to reduce the risk of ice formation, cracking, and leakage inside the water-fluorine heat exchanger.

[0093] In addition, as Figure 3 shown, Figure 3 is a flowchart of a method for controlling the frequency of a compressor provided by another embodiment of the present application; regarding controlling the operating frequency of the compressor according to the communication anomaly time and the state parameters in step S230 above, it may include but is not limited to step S310 and step S320.

[0094] Step S310: Determine that the communication anomaly time is greater than a first preset time;

[0095] Step S320: Control the operating frequency of the compressor according to the current operating frequency and the preset frequency.

[0096] In one embodiment, if a communication fault is detected between the hydraulic module and the outdoor unit, the embodiments of the present application will measure the communication anomaly time; then, when the communication anomaly time is greater than the first preset time, the embodiments of the present application will obtain the current operating frequency of the compressor, compare the current operating frequency with the preset frequency to obtain a comparison result, and finally control the operating frequency of the compressor according to the comparison result, avoiding the operating frequency of the compressor from being too high or controlling the compressor to slowly reduce the frequency, thereby reducing the problem of too low system evaporation temperature, and further being able to reduce the risk of ice formation, cracking, and leakage inside the water-fluorine heat exchanger.

[0097] It can be understood that regarding the above-mentioned first preset time, its duration can be preset or obtained through experiments, and the embodiments of the present application do not specifically limit the duration of the first preset time.

[0098] In addition, it can be understood that regarding the above-mentioned preset frequency, its value can be preset or obtained through experiments, and the embodiments of the present application do not specifically limit the value of the preset frequency.

[0099] In addition, as Figure 4 shown, Figure 4 is a flowchart of a method for controlling the frequency of a compressor provided by another embodiment of the present application; regarding controlling the operating frequency of the compressor according to the current operating frequency and the preset frequency in step S320 above, it may include but is not limited to step S410 and step S420.

[0100] Step S410: When the current operating frequency of the compressor is greater than the preset frequency, use the preset frequency as the operating frequency of the compressor;

[0101] Step S420: When the current operating frequency of the compressor is less than or equal to the preset frequency, correct the current operating frequency according to a preset first correction value to reduce the operating frequency of the compressor.

[0102] In an embodiment, when the communication abnormal time is greater than the first preset time, the present application embodiment will compare the current operating frequency and the preset frequency to obtain a comparison result. If the current operating frequency of the compressor is greater than the preset frequency, it indicates that the current operating frequency of the compressor is relatively high. At this time, it is necessary to reduce the current operating frequency of the compressor. For example, reduce the current operating frequency of the compressor to the preset frequency; in addition, if the current operating frequency of the compressor is less than or equal to the preset frequency, in order to avoid the risk of internal icing and leakage of the water-fluorine heat exchanger caused by the reduction of the water flow rate of the hydraulic module, the present application embodiment will appropriately reduce the current operating frequency of the compressor. For example, obtain the preset first correction value and use this first correction value to correct the current operating frequency, so as to obtain the target frequency after frequency reduction.

[0103] It should be noted that regarding the type of the above-mentioned first correction value, it can be a proportional value. For example, when the proportional value is 80%, the operating frequency of the compressor can be reduced to 80% of the original; it can also be an amplitude value. For example, when the proportional value is -100 Hz, the operating frequency of the compressor can be reduced by 100 Hz. It can also be other types of parameters. The present application embodiment does not specifically limit the type of the first correction value.

[0104] It can be understood that regarding the magnitude of the above-mentioned first correction value, it can be 80%, or 70%, or -100 Hz, or -50 Hz, or other values. The present application embodiment does not specifically limit the numerical magnitude of the first correction value.

[0105] In addition, as Figure 5 shown, Figure 5 is a flowchart of a compressor frequency control method provided by another embodiment of the present application; regarding the control of the operating frequency of the compressor according to the communication abnormal time and the status parameter in the above-mentioned step S230, it may include but is not limited to step S510 and step S520.

[0106] Step S510: Determine that the communication abnormal time is greater than the second preset time;

[0107] Step S520: Control the operating frequency of the compressor according to the first exhaust parameter change value and the first preset change threshold, where the second preset time is greater than the first preset time.

[0108] In one embodiment, when the communication abnormal time exceeds the first preset time and the communication has not returned to normal when reaching the second preset time, and when the communication abnormal time is greater than the second preset time, the embodiment of the present application will obtain the first exhaust parameter change value of the compressor, compare the first exhaust parameter change value with the first preset change threshold to obtain a comparison result, and finally control the operating frequency of the compressor according to the comparison result, so as to avoid the operating frequency of the compressor being too high or control the compressor to slowly reduce the frequency, thereby reducing the problem of too low system evaporation temperature, and further reducing the risk of ice formation and leakage inside the water-fluorine heat exchanger.

[0109] It can be understood that regarding the above-mentioned second preset time, its duration can be preset or obtained through experiments. The embodiment of the present application does not specifically limit the duration of the second preset time.

[0110] In addition, it can be understood that the above-mentioned second preset time should be greater than the above-mentioned first preset time.

[0111] It should be noted that regarding the type of the above-mentioned first exhaust parameter change value, it can be the exhaust temperature change value of the compressor or the exhaust pressure change value of the compressor. The embodiment of the present application does not specifically limit the type of the first exhaust parameter change value.

[0112] In addition, it can be understood that regarding the above-mentioned first preset change threshold, its duration can be preset or obtained through experiments. The embodiment of the present application does not specifically limit the numerical value of the first preset change threshold.

[0113] In addition, as Figure 6 shown, Figure 6 is a flowchart of a compressor frequency control method provided by another embodiment of the present application; regarding the control of the operating frequency of the compressor according to the first exhaust parameter change value and the first preset change threshold in the above step S520, it may include but is not limited to step S610 and step S620.

[0114] Step S610: When the first exhaust parameter change value is greater than the first preset change threshold, correct the operating frequency of the compressor according to a preset second correction value to reduce the operating frequency of the compressor;

[0115] Step S620: When the first exhaust parameter change value is less than or equal to the first preset change threshold, keep the operating frequency of the compressor unchanged.

[0116] In one embodiment, when the communication anomaly time is greater than the second preset time, the embodiment of the present application will compare the first exhaust parameter change value with the first preset change threshold to obtain a comparison result. If the first exhaust parameter change value is greater than the first preset change threshold, it indicates that the exhaust parameter of the compressor has changed significantly during the previous time period. To avoid the risk of internal icing and leakage in the water-fluorine heat exchanger caused by the decrease in the water flow rate of the hydraulic module, the embodiment of the present application will appropriately reduce the current operating frequency of the compressor. For example, obtain a preset second correction value and use this second correction value to correct the current operating frequency, so as to obtain the target frequency after frequency reduction. Additionally, if the first exhaust parameter change value is less than or equal to the first preset change threshold, it indicates that the exhaust parameter of the compressor has changed slightly during the previous time period. At this time, it is not necessary to reduce the current operating frequency of the compressor. For example, the operating frequency of the compressor can be controlled to remain unchanged.

[0117] It should be noted that regarding the type of the above-mentioned second correction value, it can be a proportional value. For example, when the proportional value is 80%, the operating frequency of the compressor can be reduced to 80% of the original; it can also be an amplitude value. For example, when the proportional value is -100 Hz, the operating frequency of the compressor can be reduced by 100 Hz. It can also be other types of parameters. The embodiment of the present application does not specifically limit the type of the second correction value.

[0118] It can be understood that regarding the magnitude of the above-mentioned second correction value, it can be 80%, or 70%, or -100 Hz, or -50 Hz, or other values. The embodiment of the present application does not specifically limit the numerical magnitude of the second correction value.

[0119] Additionally, it can be understood that the second correction value can be equal to the first correction value or not equal to the first correction value. The embodiment of the present application does not specifically limit the magnitude relationship between the first correction value and the second correction value.

[0120] Additionally, as Figure 7 shown, Figure 7 is a flowchart of the frequency control method of the compressor provided by another embodiment of the present application; regarding the acquisition process of the above-mentioned first exhaust parameter change value, it can include but is not limited to step S710, step S720, and step S730.

[0121] Step S710: When the communication anomaly time reaches the first preset time, obtain the first exhaust parameter of the compressor;

[0122] Step S720: When the communication anomaly time reaches the second preset time, obtain the second exhaust parameter of the compressor;

[0123] Step S730: Use the difference between the second exhaust parameter and the first exhaust parameter as the change value of the first exhaust parameter.

[0124] In one embodiment, the embodiment of the present application can obtain the first exhaust parameter at the first preset time, and obtain the second exhaust parameter at the second preset time, and calculate the difference between the second exhaust parameter and the first exhaust parameter. Then this difference is the change value of the first exhaust parameter during the period from the first preset time to the second preset time.

[0125] In addition, as Figure 8 shown, Figure 8 is a flowchart of a frequency control method for a compressor provided by another embodiment of the present application; regarding controlling the operating frequency of the compressor according to the communication abnormal time and the status parameter in the above step S230, it may include but is not limited to step S810 and step S820.

[0126] Step S810: Determine that the communication abnormal time is greater than the third preset time;

[0127] Step S820: Control the operating frequency of the compressor according to the change value of the second exhaust parameter and the second preset change threshold, where the third preset time is greater than the second preset time.

[0128] In one embodiment, when the communication abnormal time exceeds the second preset time and the communication has not returned to normal when reaching the third preset time, when the communication abnormal time is greater than the third preset time, the embodiment of the present application will obtain the change value of the second exhaust parameter of the compressor, compare this change value of the second exhaust parameter with the second preset change threshold to obtain a comparison result, and finally control the operating frequency of the compressor according to this comparison result, avoiding the operating frequency of the compressor from being too high or controlling the compressor to slowly reduce the frequency, thereby reducing the problem of too low system evaporation temperature, and further being able to reduce the risk of ice formation and leakage inside the water-fluorine heat exchanger.

[0129] It can be understood that regarding the above-mentioned third preset time, its duration can be preset, or can be obtained through experiments. The embodiment of the present application does not make a specific limitation on the duration of the third preset time.

[0130] In addition, it can be understood that the above-mentioned third preset time should be greater than the above-mentioned second preset time.

[0131] It should be noted that regarding the type of the above-mentioned change value of the second exhaust parameter, it can be the change value of the exhaust temperature of the compressor or the change value of the exhaust pressure of the compressor. The embodiment of the present application does not make a specific limitation on the type of the change value of the second exhaust parameter.

[0132] In addition, it can be understood that regarding the above-mentioned second preset change threshold, its duration can be preset or obtained through experiments. The embodiments of the present application do not specifically limit the numerical value of the second preset change threshold.

[0133] In addition, it can be understood that the second preset change threshold can be equal to the first preset change threshold or not equal to the first preset change threshold. The embodiments of the present application do not specifically limit the magnitude relationship between the first preset change threshold and the second preset change threshold.

[0134] In addition, as Figure 9 shown, Figure 9 is a flowchart of a frequency control method for a compressor provided by another embodiment of the present application; regarding controlling the operating frequency of the compressor according to the second exhaust parameter change value and the second preset change threshold in the above step S820, it may include but is not limited to step S910 and step S920.

[0135] Step S910: When the second exhaust parameter change value is greater than the second preset change threshold, control the compressor to stop operating;

[0136] Step S920: When the second exhaust parameter change value is less than or equal to the second preset change threshold, reduce the operating frequency of the compressor to the preset minimum allowable operating frequency.

[0137] In one embodiment, when the communication abnormal time is greater than the third preset time, the embodiments of the present application will compare the second exhaust parameter change value with the second preset change threshold to obtain a comparison result. If the second exhaust parameter change value is greater than the second preset change threshold, it indicates that the exhaust parameter change of the compressor in the previous time period is relatively large. To avoid the risk of ice cracking and leakage inside the water-fluorine heat exchanger caused by the reduction of the water flow rate of the hydraulic module, and since the communication abnormal time has been relatively long, the embodiments of the present application will control the compressor to stop operating at this time. In addition, if the second exhaust parameter change value is less than or equal to the second preset change threshold, it indicates that the exhaust parameter change of the compressor in the previous time period is relatively small, but since the communication abnormal time has been relatively long, the operating frequency of the compressor will be reduced to the preset minimum allowable operating frequency at this time.

[0138] In addition, as Figure 10 shown, Figure 10 is a flowchart of a frequency control method for a compressor provided by another embodiment of the present application; after performing the above step S920, the frequency control method of the embodiments of the present application may further include but is not limited to step S1010 and step S1020.

[0139] Step S1010: When the communication abnormal time is greater than the preset communication fault detection time, control the compressor to stop operating;

[0140] Step S1020: When the communication abnormal time is less than or equal to the preset communication fault detection time, keep the operating frequency of the compressor unchanged.

[0141] In one embodiment, when the communication abnormal time is greater than the third preset time, if the change value of the second exhaust parameter is less than or equal to the second preset change threshold, the embodiment of the present application will reduce the operating frequency of the compressor to the preset minimum allowable operating frequency. Then, the embodiment of the present application will compare the communication abnormal time with the preset communication fault detection time. If the communication abnormal time is greater than the preset communication fault detection time, when it is confirmed that communication cannot be restored between the outdoor unit and the hydraulic module, in order to avoid the risk of ice cracking and leakage inside the water-fluorine heat exchanger, the embodiment of the present application will control the compressor to stop operating; additionally, if the communication abnormal time is less than or equal to the preset communication fault detection time, control the compressor to continue operating at the minimum allowable operating frequency.

[0142] It can be understood that regarding the above-mentioned communication fault detection time, its duration can be preset or obtained through experiments. The embodiment of the present application does not specifically limit the duration of the communication fault detection time.

[0143] In addition, as Figure 11 shown, Figure 11 is a flowchart of the frequency control method of the compressor provided by another embodiment of the present application; regarding the obtaining process of the above-mentioned change value of the second exhaust parameter, it may include but is not limited to Step S1110, Step S1120, and Step S1130.

[0144] Step S1110: When the communication abnormal time reaches the second preset time, obtain the second exhaust parameter of the compressor;

[0145] Step S1120: When the communication abnormal time reaches the third preset time, obtain the third exhaust parameter of the compressor;

[0146] Step S1130: Take the difference between the third exhaust parameter and the second exhaust parameter as the change value of the second exhaust parameter.

[0147] In one embodiment, the embodiment of the present application can obtain the second exhaust parameter at the second preset time, and obtain the third exhaust parameter at the third preset time, and calculate the difference between the third exhaust parameter and the second exhaust parameter. Then, this difference is the change value of the second exhaust parameter in the time period from the second preset time to the third preset time.

[0148] Based on the compressor frequency control methods of the above various embodiments, the overall embodiments of the compressor frequency control method of the present application are respectively proposed below.

[0149] As Figure 12 shown,Figure 12 It is the overall flowchart of the frequency control method of the compressor provided by an embodiment of the present application; the overall process includes but is not limited to the following steps:

[0150] Step S1210, the compressor starts to run;

[0151] Step S1220, determine whether the communication abnormal time Tfail > preset value T1 is satisfied. If so, execute step S1230; otherwise, execute step S1290;

[0152] Step S1230, determine whether the compressor operating frequency Fr > preset value 2 is satisfied. If so, execute step S1231; otherwise, execute step S1232;

[0153] Step S1231, the compressor target frequency Fb runs according to the preset value 2, and execute step S1240;

[0154] Step S1232, the compressor target frequency Fb is corrected according to the correction value B1, and execute step S1240;

[0155] Step S1240, determine whether the communication abnormal time Tfail > preset value T2 is satisfied. If so, execute step S1250; otherwise, execute step S1290;

[0156] Step S1250, determine whether the exhaust temperature change value is greater than the preset value 3 or the pressure change value is greater than the preset value 4. If so, execute step S1251; otherwise, execute step S1252;

[0157] Step S1251, the compressor target frequency Fb is corrected according to the correction value B1, and execute step S1260;

[0158] Step S1252, maintain the current frequency to run, and execute step S1260;

[0159] Step S1260, determine whether the communication abnormal time Tfail > preset value T3 is satisfied. If so, execute step S1270; otherwise, execute step S1290;

[0160] Step S1270, determine whether the exhaust temperature change value is greater than the preset value 5 or the pressure change value is greater than the preset value 6. If so, execute step S1271; otherwise, execute step S1272;

[0161] Step S1271, the compressor stops running;

[0162] Step S1272, the compressor frequency is reduced to the minimum frequency, and execute step S1280;

[0163] Step S1280: Determine whether the communication exception time Tfail > the communication fault detection time T. If so, execute Step S1271; otherwise, execute Step S1290.

[0164] Step S1290: Keep running at the current frequency.

[0165] Specifically, in combination with Figure 1 the shown heat pump chiller, the heat pump chiller realizes information interaction between the outdoor unit and the hydraulic module through a communication circuit, forming a complete control system. When the hydraulic module of the heat pump chiller receives the startup signal, it sends the startup requirement to the outdoor unit. The outdoor unit turns on the compressor according to the current capacity requirement and the ambient temperature. During the operation of the system, if there is an abnormality in the communication circuit device or it is interfered by other signals, it may cause communication abnormalities between the outdoor unit and the hydraulic module. It is preset that when the outdoor unit does not receive information from the hydraulic module for a certain period of time continuously, a communication fault is confirmed. Before the outdoor unit confirms the communication fault, the compressor frequency is adjusted in sections according to the communication exception time, system pressure, and exhaust temperature to slowly reduce the frequency, avoiding too low evaporation temperature of the system and preventing ice cracking and leakage inside the water-fluorine heat exchanger. The specific control method is as follows:

[0166] 1. During the operation of the compressor, when the continuous communication exception time Tfail of the outdoor unit is greater than the preset value T1, if the current compressor operation frequency Fr > the preset value 2, then reduce the compressor target frequency Fb, Fb = the preset value 2; otherwise, the compressor target frequency Fb = Fr * B1, where B1 is the preset value and B1 < 1. At the same time, record the exhaust temperature Tp1 and the pressure value Tpress1 at this time.

[0167] 2. When the continuous communication exception time Tfail of the outdoor unit is greater than the preset value T2, record the exhaust temperature Tp2 and the pressure value Tpress2 at this time: If Tp2 - Tp1 ≥ the preset value 3 or Tpress2 - Tpress1 ≥ the preset value 4, continue to reduce the compressor target frequency Fb, Fb = Fr * B2, where B2 is the preset value and B2 < 1. If the adjusted compressor target frequency Fb ≤ the compressor minimum operation frequency Fmin, then take Fmin as the compressor target frequency Fb, that is, Fb = Fmin; otherwise, the compressor continues to run at the current frequency.

[0168] 3. When the continuous communication abnormal time Tfail of the outdoor unit is greater than the preset value T3, record the exhaust temperature Tp3 and the pressure value Tpress3 at this time: If Tp3 - Tp2 ≥ the preset value 5 or Tpress3 - Tpress2 ≥ the preset value 6, then turn off the compressor to stop running; otherwise, continue to reduce the compressor target frequency Fb, where Fb = Fr * B3, B3 is the preset value, and B3 < 1. If the adjusted compressor target frequency Fb ≤ the compressor minimum operating frequency Fmin, then take Fmin as the compressor target frequency Fb, that is, Fb = Fmin;

[0169] 4. When the continuous communication abnormal time Tfail of the outdoor unit is greater than the communication failure detection time T, turn off the compressor to stop running.

[0170] The embodiments of the present application can achieve that before the outdoor unit stops running the compressor without confirming the communication failure, the compressor frequency is adjusted in segments according to the communication abnormal time, system pressure, and exhaust temperature to slowly reduce the frequency, avoiding too low system evaporation temperature and preventing ice cracking and leakage inside the water-fluorine heat exchanger.

[0171] Based on the compressor frequency control methods of the above respective embodiments, the respective embodiments of the controller, outdoor unit, heat pump cold and hot water unit, and computer-readable storage medium of the present application are respectively proposed below.

[0172] As Figure 13 shown, Figure 13 is a schematic structural diagram of a controller for executing the compressor frequency control method provided by an embodiment of the present application. The controller 300 implemented in the present application includes: a processor 310, a memory 320, and a computer program stored on the memory 320 and executable on the processor 310. Among them, Figure 13 one processor 310 and one memory 320 are taken as examples.

[0173] The processor 310 and the memory 320 can be connected through a bus or other means, Figure 13 taking the connection through a bus as an example.

[0174] The memory 320, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs. In addition, the memory 320 may include high-speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, a flash memory device, or other non-transitory solid-state storage devices. In some embodiments, the memory 320 may optionally include a memory 320 remotely set relative to the processor 310, and these remote memories 320 can be connected to the controller 300 through a network. Examples of the above network include but are not limited to the Internet, enterprise intranet, local area network, mobile communication network, and their combinations.

[0175] Those skilled in the art can understand that Figure 13 the device structure shown in Figure 13 does not constitute a limitation on the controller 300, and it may include more or fewer components than shown in the figure, or combine some components, or have different component arrangements.

[0176] In Figure 13 the controller 300 shown in Figure 13 , the processor 310 can be used to call the control program stored in the memory 320, so as to implement the above-mentioned frequency control method of the compressor. Specifically, the non-transitory software program and instructions required to implement the frequency control method of the compressor in the above-mentioned embodiments are stored in the memory 320, and when executed by the processor 310, the frequency control method of the compressor in the above-mentioned embodiments is executed.

[0177] It should be noted that since the controller 300 of the embodiments of the present application can execute the frequency control method of the compressor in any of the above-mentioned embodiments, therefore, the specific implementation manners and technical effects of the controller 300 of the embodiments of the present application can refer to the specific implementation manners and technical effects of the frequency control method of the compressor in any of the above-mentioned embodiments.

[0178] In addition, an embodiment of the present application further provides an outdoor unit, and the outdoor unit includes the controller of the above-mentioned embodiment.

[0179] It should be noted that since the outdoor unit of the embodiments of the present application includes the controller of the above-mentioned embodiment, and the controller of the above-mentioned embodiment can execute the frequency control method of the compressor in any of the above-mentioned embodiments, therefore, the specific implementation manners and technical effects of the outdoor unit of the embodiments of the present application can refer to the specific implementation manners and technical effects of the frequency control method of the compressor in any of the above-mentioned embodiments.

[0180] In addition, an embodiment of the present application further provides a heat pump cold and hot water unit, and the heat pump cold and hot water unit includes the outdoor unit or the controller of the above-mentioned embodiment.

[0181] It should be noted that since the heat pump cold and hot water unit of the embodiments of the present application includes the outdoor unit or the controller of the above-mentioned embodiment, and the outdoor unit of the above-mentioned embodiment includes the controller of the above-mentioned embodiment, and the controller of the above-mentioned embodiment can execute the frequency control method of the compressor in any of the above-mentioned embodiments, therefore, the specific implementation manners and technical effects of the heat pump cold and hot water unit of the embodiments of the present application can refer to the specific implementation manners and technical effects of the frequency control method of the compressor in any of the above-mentioned embodiments.

[0182] In addition, an embodiment of the present application further provides a computer-readable storage medium, and the computer-readable storage medium stores computer-executable instructions for executing the above-mentioned frequency control method of the compressor. Exemplarily, execute the above-describedFigures 2 to 12 The method steps in

[0183] It should be noted that since the computer-readable storage medium of the embodiments of the present application can execute the frequency control method of the compressor in any of the above embodiments, therefore, for the specific implementation manners and technical effects of the computer-readable storage medium of the embodiments of the present application, reference can be made to the specific implementation manners and technical effects of the frequency control method of the compressor in any of the above embodiments.

[0184] Those of ordinary skill in the art can understand that all or some of the steps and systems in the methods disclosed above can be implemented as software, firmware, hardware, and their appropriate combinations. Some physical components or all physical components can be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or can be implemented as hardware, or can be implemented as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which can include a computer storage medium (or non-transitory medium) and a communication medium (or transitory medium). As is well known to those of ordinary skill in the art, the term computer storage medium 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 storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disks (DVDs) or other optical disk storage, magnetic cassettes, tapes, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store the desired information and can be accessed by a computer. In addition, as is well known to those of ordinary skill in the art, communication media typically includes computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transmission mechanism, and can include any information delivery medium.

[0185] The above has specifically described the preferred embodiments of the present application, but the present application is not limited to the above embodiments. Those skilled in the art can also make various equivalent deformations or substitutions without departing from the spirit of the present application, and these equivalent deformations or substitutions are all included within the scope defined by the claims of the present application.

Claims

1. A frequency control method for a compressor, characterized in that, applied to a heat pump chiller, the heat pump chiller includes an outdoor unit and a hydraulic module, the outdoor unit and the hydraulic module are communicatively connected, and the hydraulic module is used to supply the water heat-exchanged by the outdoor unit to the indoor heat exchange equipment; the frequency control method includes: Obtain the communication status between the outdoor unit and the hydraulic module; When there is a communication failure between the outdoor unit and the hydraulic module, obtain the communication abnormal time and the status parameters of the compressor; Control the operating frequency of the compressor according to the communication abnormal time and the status parameters.

2. The frequency control method according to claim 1, characterized in that, the status parameters include the current operating frequency; the controlling the operating frequency of the compressor according to the communication abnormal time and the status parameters includes: When the communication abnormal time is greater than a first preset time, control the operating frequency of the compressor according to the current operating frequency and a preset frequency.

3. The frequency control method according to claim 2, characterized in that, the adjusting the operating frequency of the compressor according to the current operating frequency and the preset frequency includes one of the following: When the current operating frequency is greater than the preset frequency, use the preset frequency as the operating frequency of the compressor; When the current operating frequency is less than or equal to the preset frequency, correct the current operating frequency according to a preset first correction value to reduce the operating frequency of the compressor.

4. The frequency control method according to claim 2, characterized in that, the status parameters include a first exhaust parameter change value; the controlling the operating frequency of the compressor according to the communication abnormal time and the status parameters further includes: When the communication abnormal time is greater than a second preset time, control the operating frequency of the compressor according to the first exhaust parameter change value and a first preset change threshold, wherein the second preset time is greater than the first preset time.

5. The frequency control method according to claim 4, characterized in that, the controlling the operating frequency of the compressor according to the first exhaust parameter change value and the first preset change threshold includes one of the following: When the first exhaust parameter change value is greater than the first preset change threshold, correct the operating frequency of the compressor according to a preset second correction value to reduce the operating frequency of the compressor; When the first exhaust parameter change value is less than or equal to the first preset change threshold, keep the operating frequency of the compressor unchanged.

6. The frequency control method according to claim 4, characterized in that, the first exhaust parameter change value is obtained through the following steps: When the communication abnormal time reaches the first preset time, obtain the first exhaust parameter of the compressor; When the communication abnormal time reaches the second preset time, obtain the second exhaust parameter of the compressor; Take the difference between the second exhaust parameter and the first exhaust parameter as the first exhaust parameter change value.

7. The frequency control method according to claim 4, characterized in that, The state parameter further includes a second exhaust parameter change value; the controlling the operating frequency of the compressor according to the communication abnormal time and the state parameter further includes: When the communication abnormal time is greater than a third preset time, controlling the operating frequency of the compressor according to the second exhaust parameter change value and a second preset change threshold, where the third preset time is greater than the second preset time.

8. The frequency control method according to claim 7, wherein, the controlling the operating frequency of the compressor according to the second exhaust parameter change value and the second preset change threshold includes one of the following: When the second exhaust parameter change value is greater than the second preset change threshold, controlling the compressor to stop operating; When the second exhaust parameter change value is less than or equal to the second preset change threshold, reducing the operating frequency of the compressor to a preset minimum allowable operating frequency.

9. The frequency control method according to claim 8, wherein, after reducing the operating frequency of the compressor to the preset minimum allowable operating frequency, the frequency control method further includes one of the following: When the communication abnormal time is greater than a preset communication fault detection time, controlling the compressor to stop operating; When the communication abnormal time is less than or equal to the preset communication fault detection time, keeping the operating frequency of the compressor unchanged.

10. The frequency control method according to claim 7, wherein, the second exhaust parameter change value is obtained through the following steps: When the communication abnormal time reaches the second preset time, obtaining the second exhaust parameter of the compressor; When the communication abnormal time reaches the third preset time, obtaining the third exhaust parameter of the compressor; Taking the difference between the third exhaust parameter and the second exhaust parameter as the second exhaust parameter change value.

11. The frequency control method according to any one of claims 7 to 10, wherein, the first exhaust parameter change value and / or the second exhaust parameter change value includes one of the following: exhaust temperature change value, exhaust pressure change value.

12. A controller, wherein, it includes: a memory, a processor, and a computer program stored on the memory and executable on the processor, and when the processor runs the computer program, it executes the frequency control method of the compressor according to any one of claims 1 to 11.

13. A heat pump cold and hot water unit, wherein, it includes the controller according to claim 12.

14. A computer-readable storage medium, wherein: it stores computer-executable instructions for executing the frequency control method of the compressor according to any one of claims 1 to 11.

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