Control method of heat pump water heater and heat pump water heater

Abstract

The invention provides a control method of a heat pump water heater and the heat pump water heater. The control method relates to the technical field of heat pumps. The control method comprises the steps that the actual temperature rise rate of the heat pump water heater in the current environment and the target temperature rise rate of the heat pump water heater are obtained; determining a target operation frequency based on the actual temperature rise rate and the target temperature rise rate; and based on the target operation frequency, a compressor in the heat pump water heater is controlled to operate. The control method can ensure that the heating capacity of the heat pump water heater adapts to the environment change so as to meet the water demand of a user.

Description

Technical Field

[0001] This application relates to the field of heat pump technology, and more specifically, to a control method for a heat pump water heater and a heat pump water heater in the field of heat pump technology. Background Technology

[0002] Traditional heat pump water heaters typically use a heat pump unit to continuously heat the water in the tank, maintaining a high water temperature for user use. However, the heat storage capacity of the water tank is affected by the surrounding environment, which can limit the hot water temperature and fail to meet the user's water needs, thus impacting the user experience.

[0003] Therefore, ensuring that the heating capacity of heat pump water heaters adapts to environmental changes in order to meet users' water needs is an urgent problem to be solved. Summary of the Invention

[0004] This application provides a control method for a heat pump water heater and a heat pump water heater. The control method can ensure that the heating capacity of the heat pump water heater adapts to environmental changes to meet the user's water demand.

[0005] Firstly, a control method for a heat pump water heater is provided, the control method comprising: Obtain the actual temperature rise rate of the heat pump water heater under the current environment and the target temperature rise rate of the heat pump water heater; The target operating frequency is determined based on the actual temperature rise rate and the target temperature rise rate. The compressor in the heat pump water heater is controlled based on the target operating frequency.

[0006] In the above technical solution, the actual and target temperature rise rates of the heat pump water heater under the current environment are monitored. Based on these rates, the target operating frequency of the compressor in the heat pump water heater is determined, and the compressor is controlled to operate at the target frequency. Compared to existing technologies where the compressor operates at a fixed rated frequency, this solution adjusts the compressor's operating frequency based on the temperature rise rate under the current environment. This ensures that the heating capacity of the heat pump water heater matches the temperature rise requirements of the current environment, thereby meeting the user's hot water needs.

[0007] In conjunction with the first aspect, in some possible implementations, the target operating frequency is determined based on the actual temperature rise rate and the target temperature rise rate, including: The compressor's operating mode is determined based on the actual temperature rise rate and the target temperature rise rate. The target operating frequency is determined based on the compressor's operating mode.

[0008] In the above technical solution, the compressor's operating mode is first determined based on the actual temperature rise rate and the target temperature rise rate. Then, based on the compressor's operating mode, the specific target operating frequency is determined. By adopting a hierarchical control strategy of first determining the operating mode and then determining the target frequency, the compressor's frequency regulation becomes more targeted, improving the efficiency of determining the compressor's target operating frequency under different operating conditions.

[0009] Combining the first aspect and the above implementation methods, in some possible implementation methods, the compressor's operating mode is determined based on the actual temperature rise rate and the target temperature rise rate, including: When the actual temperature rise rate is greater than or equal to the target temperature rise rate, the compressor's operating mode is determined to be the first operating mode. In the first operating mode, the compressor operates at a fixed frequency. When the actual temperature rise rate is less than the target temperature rise rate, the compressor's operating mode is determined to be the second operating mode, which refers to the mode in which the compressor undergoes frequency compensation.

[0010] In the above technical solution, when the actual temperature rise rate is greater than or equal to the target temperature rise rate, the compressor's operating mode is determined to be the first operating mode, instructing the compressor to operate at a fixed frequency; when the actual temperature rise rate is less than the target temperature rise rate, the compressor's operating mode is determined to be the second operating mode, to compensate for the compressor's frequency. Based on the relationship between the actual and target temperature rise rates, distinguishing between the fixed-frequency first operating mode and the frequency-compensated second operating mode ensures stable operation and energy savings when heating capacity is sufficient, while also proactively compensating when capacity is insufficient, thus guaranteeing efficient hot water supply.

[0011] Combining the first aspect and the above implementation methods, in some possible implementation methods, the target operating frequency is determined based on the compressor's operating mode, including: When the compressor is in the first operating mode, the first preset frequency is set as the target operating frequency; When the compressor is in the second operating mode, the target operating frequency is determined based on the actual temperature rise rate.

[0012] In the above technical solution, a corresponding preset frequency is matched for different operating modes. In the first operating mode, a fixed first preset frequency is used to ensure the operational stability of the heat pump water heater; in the second operating mode, the target operating frequency of the compressor is dynamically adjusted according to the actual temperature rise rate, so that the adjustment of the operating frequency is more in line with the actual temperature rise requirements, improving the accuracy of the target operating frequency, and thus improving the precision of the heating process.

[0013] Combining the first aspect and the above implementation methods, in some possible implementation methods, the target operating frequency is determined based on the actual temperature rise rate, including: When the actual temperature rise rate is greater than or equal to the first rate threshold, the second preset frequency is determined as the target operating frequency; When the actual temperature rise rate is less than the first rate threshold and greater than or equal to the second rate threshold, the third preset frequency is determined as the target operating frequency. When the actual temperature rise rate is less than the second rate threshold, the fourth preset frequency is determined as the target operating frequency; Among them, the first rate threshold is less than the target temperature rise rate, and the second rate threshold is less than the first rate threshold; the target operating frequencies, from smallest to largest, are the first preset frequency, the second preset frequency, the third preset frequency, and the fourth preset frequency.

[0014] In the above technical solution, when the actual temperature rise rate is greater than or equal to the first rate threshold, the target operating frequency is determined as the second preset frequency; when the actual temperature rise rate is between the first and second rate thresholds, the target operating frequency is determined as the third preset frequency; and when the actual temperature rise rate is less than the second rate threshold, the target operating frequency is determined as the fourth preset frequency. By setting multiple rate thresholds and corresponding preset frequencies, graded frequency compensation in the second operating mode is achieved. Specifically, the closer the temperature rise rate is to the target temperature rise rate, the smaller the frequency adjustment range, thereby efficiently reducing the gap between the actual and target temperature rise rates and improving the adaptability of the compressor's operating frequency to different environments.

[0015] In combination with the first aspect and the above implementation methods, in some possible implementations, the control method further includes: Obtain the water tank temperature and ambient temperature of the heat pump water heater under the current environment; The target temperature rise rate is determined based on the water tank temperature and the ambient temperature. Among them, the target temperature rise rate is negatively correlated with the water tank temperature, and positively correlated with the ambient temperature.

[0016] In the above technical solution, the target temperature rise rate is dynamically determined by combining the water tank temperature and the ambient temperature of the heat pump water heater under the current environment. The higher the water tank temperature, the lower the target temperature rise rate, and the higher the ambient temperature, the higher the target temperature rise rate. This ensures that the target temperature rise rate can reflect the heating demand of the current environment and improves the accuracy of the target temperature rise rate. Furthermore, when determining the target operating frequency of the compressor by combining the target temperature rise rate and the actual temperature rise rate, the accuracy of the target operating frequency can be further improved to ensure that the operation of the compressor can meet the heating demand of the current environment.

[0017] In combination with the first aspect and the above implementation methods, in some possible implementations, the control method further includes: After the heat pump water heater is turned on, determine the target difference between the exhaust temperature of the heat pump water heater and the water tank temperature; Obtaining the actual temperature rise rate of the heat pump water heater under the current environment and the target temperature rise rate of the heat pump water heater includes: When the target difference is greater than or equal to the preset difference threshold, the actual temperature rise rate of the heat pump water heater in the current environment and the target temperature rise rate of the heat pump water heater are obtained.

[0018] In the above technical solution, after the heat pump water heater is turned on, the target difference between the exhaust temperature and the water tank temperature is calculated. Ensuring that the target difference reaches a preset threshold, the actual temperature rise rate and the target temperature rise rate of the heat pump water heater are acquired, triggering frequency control of the compressor. By using the target difference between the exhaust temperature and the water tank temperature as the condition for triggering temperature rise rate control, precise adjustment is only initiated when the system has established a stable exhaust superheat. This avoids interference from unsteady-state data during initial startup, improving control reliability and adjustment accuracy.

[0019] In combination with the first aspect and the above implementation methods, in some possible implementations, the control method further includes: During the process of controlling the operation of the compressor in the heat pump water heater, the current temperature rise rate and the current target temperature rise rate of the heat pump water heater are obtained at a preset time period. The heat pump water heater is controlled based on the current temperature rise rate and the current target temperature rise rate.

[0020] In the above technical solution, during the operation of the compressor, the current temperature rise rate and the current target temperature rise rate of the heat pump water heater are continuously monitored at a preset time period and the heat pump water heater is controlled accordingly. This can respond in real time to temperature rise fluctuations caused by changes in the environment or load, ensuring that the heating capacity is always adapted to the heating needs of different environmental conditions.

[0021] Combining the first aspect and the above implementation methods, in some possible implementation methods, the heat pump water heater is controlled based on the current temperature rise rate and the current target temperature rise rate, including: When the current temperature rise rate is greater than or equal to the current target temperature rise rate, control the compressor to run at the first preset frequency; When the current temperature rise rate is less than the current target temperature rise rate, and the target number of cycles is less than or equal to the preset number of cycles, the compressor is controlled to run at the target operating frequency corresponding to the current temperature rise rate. When the current temperature rise rate is less than the current target temperature rise rate and the target number of cycles is greater than the preset number of cycles, the electric auxiliary heating device in the heat pump water heater is turned on. The target cycle number refers to the cumulative number of cycles during which a preset duration period is used to detect that the current temperature rise rate is less than the current target temperature rise rate.

[0022] In the above technical solution, the heat pump water heater is controlled according to the relationship between the current temperature rise rate and the current target temperature rise rate. If the current temperature rise rate has reached the current target temperature rise rate, the compressor can be controlled to operate at a lower first preset frequency to avoid unnecessary compressor output and energy waste. By linking the cycle counting with the electric auxiliary heating device, the problem of long-term temperature rise not meeting the target is solved. This avoids the limitations of relying solely on compressor regulation and can activate the electric auxiliary heating when necessary to ensure hot water supply and meet the user's water demand. At the same time, the counting threshold prevents the abuse of the electric auxiliary heating device and avoids excessive energy consumption.

[0023] Secondly, a control device for a heat pump water heater is provided, the control device comprising: The acquisition module is used to acquire the actual temperature rise rate of the heat pump water heater under the current environment and the target temperature rise rate of the heat pump water heater. The processing module is used to determine the target operating frequency based on the actual temperature rise rate and the target temperature rise rate; and to control the operation of the compressor in the heat pump water heater based on the target operating frequency.

[0024] In conjunction with the second aspect, in some possible implementations, the processing module is also used to determine the compressor's operating mode based on the actual temperature rise rate and the target temperature rise rate; and to determine the target operating frequency based on the compressor's operating mode.

[0025] In conjunction with the second aspect and the above implementation methods, in some possible implementation methods, the processing module is further configured to determine the compressor's operating mode as a first operating mode when the actual temperature rise rate is greater than or equal to the target temperature rise rate, in which the compressor operates at a fixed frequency; and to determine the compressor's operating mode as a second operating mode when the actual temperature rise rate is less than the target temperature rise rate, in which the second operating mode refers to a mode for which the compressor undergoes frequency compensation.

[0026] In combination with the second aspect and the above implementation methods, in some possible implementation methods, the processing module is further configured to determine the first preset frequency as the target operating frequency when the compressor is in the first operating mode; and to determine the target operating frequency based on the actual temperature rise rate when the compressor is in the second operating mode.

[0027] In conjunction with the second aspect and the above implementation methods, in some possible implementation methods, the processing module is further configured to determine the second preset frequency as the target operating frequency when the actual temperature rise rate is greater than or equal to the first rate threshold; determine the third preset frequency as the target operating frequency when the actual temperature rise rate is less than the first rate threshold but greater than or equal to the second rate threshold; and determine the fourth preset frequency as the target operating frequency when the actual temperature rise rate is less than the second rate threshold. Wherein, the first rate threshold is less than the target temperature rise rate, and the second rate threshold is less than the first rate threshold; the target operating frequencies, in ascending order, are the first preset frequency, the second preset frequency, the third preset frequency, and the fourth preset frequency.

[0028] In combination with the second aspect and the above implementation methods, in some possible implementation methods, the acquisition module is further used to acquire the water tank temperature and ambient temperature of the heat pump water heater in the current environment; the processing module is further used to determine the target temperature rise rate based on the water tank temperature and the ambient temperature; wherein the target temperature rise rate is negatively correlated with the water tank temperature and positively correlated with the ambient temperature.

[0029] In combination with the second aspect and the above implementation methods, in some possible implementation methods, the processing module is further used to determine the target difference between the exhaust temperature of the heat pump water heater and the water tank temperature after the heat pump water heater is turned on; the acquisition module is further used to acquire the actual temperature rise rate of the heat pump water heater in the current environment and the target temperature rise rate of the heat pump water heater when the target difference is greater than or equal to a preset difference threshold.

[0030] In conjunction with the second aspect and the above implementation methods, in some possible implementation methods, the processing module is also used to acquire the current temperature rise rate and the current target temperature rise rate of the heat pump water heater at a preset time period during the process of controlling the operation of the compressor in the heat pump water heater; and to control the heat pump water heater based on the current temperature rise rate and the current target temperature rise rate.

[0031] In conjunction with the second aspect and the above implementation methods, in some possible implementation methods, the processing module is further configured to: control the compressor to operate at a first preset frequency when the current temperature rise rate is greater than or equal to the current target temperature rise rate; control the compressor to operate at a target operating frequency corresponding to the current temperature rise rate when the current temperature rise rate is less than the current target temperature rise rate and the target number of cycles is less than or equal to the preset number of cycles; and control the electric auxiliary heating device in the heat pump water heater to turn on when the current temperature rise rate is less than the current target temperature rise rate and the target number of cycles is greater than the preset number of cycles; wherein, the target number of cycles refers to the cumulative number of cycles for a preset duration period during which the current temperature rise rate is less than the current target temperature rise rate.

[0032] Thirdly, a heat pump water heater is provided, including a memory and a processor. The memory is used to store executable program code, and the processor is used to call and run the executable program code from the memory, causing the heat pump water heater to perform the methods in the first aspect or any possible implementation thereof.

[0033] Fourthly, a computer program product is provided, comprising: computer program code, which, when run on a computer, causes the computer to perform the methods described in the first aspect or any possible implementation thereof.

[0034] Fifthly, a computer-readable storage medium is provided that stores computer program code, which, when executed on a computer, causes the computer to perform the methods described in the first aspect or any possible implementation thereof. Attached Figure Description

[0035] Figure 1 This is a system architecture diagram of a heat pump water heater provided in an embodiment of this application; Figure 2 This is a schematic flowchart of a control method for a heat pump water heater provided in an embodiment of this application; Figure 3 This is a schematic diagram of a temperature rise rate range provided in an embodiment of this application; Figure 4 This is a schematic flowchart of another control method for a heat pump water heater provided in an embodiment of this application; Figure 5 This is a schematic diagram of the structure of a control device for a heat pump water heater provided in an embodiment of this application; Figure 6 This is a schematic diagram of the structure of a heat pump water heater provided in an embodiment of this application. Detailed Implementation

[0036] The technical solutions in this application will be clearly and thoroughly described below with reference to the accompanying drawings. In the description of the embodiments of this application, unless otherwise stated, " / " means "or," for example, A / B can mean A or B. "And / or" in the text is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, in the description of the embodiments of this application, "multiple" refers to two or more than two.

[0037] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as implying or suggesting relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0038] To meet users' demand for hot water, a heat pump water heater was developed, which heats cold water and outputs hot water for users. Figure 1 This is a system architecture diagram of a heat pump water heater provided in an embodiment of this application. For example... Figure 1 As shown, the heat pump water heater 100, also known as an air source heat pump water heater, has core system components including a compressor 101, a condenser 102, a throttling device 103, and an evaporator 104.

[0039] Compressor 101 is used to compress low-temperature, low-pressure gaseous refrigerant into high-temperature, high-pressure gaseous refrigerant, providing the energy basis for subsequent heat release. Common types include scroll and rotary compressors, which are key components for the heating efficiency of heat pumps.

[0040] The condenser 102 can be a heat exchanger or a water tank heat exchange coil, etc. The high-temperature, high-pressure gaseous refrigerant releases heat at the condenser 102, which is transferred to the cold water in the water tank, raising the water temperature. Simultaneously, the refrigerant itself is condensed into a high-pressure liquid. For split-type heat pumps, the condenser is often a coaxial or shell-and-tube heat exchanger, separately arranged from the water storage tank; for integrated heat pumps, the condenser is directly coiled inside the water storage tank, resulting in higher heat exchange efficiency.

[0041] The throttling device 103 may include an expansion valve or a capillary tube, etc., to throttle and reduce pressure, changing the high-pressure liquid refrigerant into a low-temperature, low-pressure gas-liquid mixture, preparing the refrigerant for heat absorption in the evaporator. Among them, the capillary tube has a simple structure and low cost, and is mostly used in small household heat pumps; the electronic expansion valve can precisely adjust the refrigerant flow rate, adapting to different operating conditions, and is mostly used in variable frequency heat pumps or commercial heat pumps.

[0042] Evaporator 104, also known as an air-side heat exchanger, allows a low-temperature, low-pressure gas-liquid mixture of refrigerant to absorb heat from the outside air, completely vaporizing into a low-temperature, low-pressure gaseous refrigerant, which then re-enters the compressor to complete the cycle. Evaporators are typically equipped with finned structures to increase the contact area with air and improve heat absorption efficiency.

[0043] During the use of a heat pump water heater, its heating capacity is affected by factors such as the surrounding environment and its own parameters. For example, the lower the ambient temperature, the lower the heating capacity of the heat pump water heater; conversely, the higher the ambient temperature, the higher the heating capacity. When the heating capacity of the heat pump water heater is low, it cannot meet the user's needs. Furthermore, current technologies typically use an electric auxiliary heating device to assist in water heating; however, because the electric auxiliary heating device generates additional energy consumption during operation, the overall energy efficiency of the unit is relatively low.

[0044] In view of the problems existing in the prior art, this application proposes a control method and a heat pump water heater. The control method obtains the actual temperature rise rate of the heat pump water heater in the current environment and the target temperature rise rate that the heat pump water heater needs to achieve; combines the actual temperature rise rate and the target temperature rise rate to determine the target operating frequency; and then controls the compressor in the heat pump water heater according to the target operating frequency, so that the heat pump water heater can adapt to the current environment to meet the user's water demand.

[0045] Meanwhile, compared to the existing technology that directly turns on the electric auxiliary heating device, this solution combines the temperature rise rate to control the compressor, which can avoid the problem of reduced unit energy efficiency caused by directly turning on the electric auxiliary heating device.

[0046] The following is combined with Figures 2 to 4 The control method for the heat pump water heater provided in the embodiments of this application will be described in detail.

[0047] Figure 2 This is a schematic flowchart illustrating a control method for a heat pump water heater provided in an embodiment of this application. It should be understood that this control method can be applied to a heat pump water heater; or, to a processor in a heat pump water heater; or, to a chip integrated into the processor of a heat pump water heater.

[0048] For example, such as Figure 2 As shown, the control method 200 includes: S201, obtain the actual temperature rise rate of the heat pump water heater under the current environment and the target temperature rise rate of the heat pump water heater.

[0049] The target temperature rise rate refers to the rate at which the heat pump water heater needs to achieve the desired temperature increase under the current environment. This target rate can be a pre-set ideal increase in the water tank temperature per unit time. When the heat pump water heater's temperature rise rate is at the target rate, it can meet the heating requirements under the current environment.

[0050] For example, the operating conditions of a heat pump water heater vary under different environmental conditions. This operating condition can be reflected by the temperature rise rate of the heat pump water heater, i.e., the temperature increase rate. During the operation of the heat pump water heater, the actual temperature rise rate of the water in the tank under the current environment and the target temperature rise rate that needs to be achieved under the current environment can be obtained.

[0051] For example, the actual rate of temperature rise can indicate the rate of temperature increase per unit time, which can be set to 1 minute, 10 minutes, etc.

[0052] In one implementation, the process of determining the target rate of temperature rise of the heat pump water heater under the current environment may include: Obtain the water tank temperature and ambient temperature of the heat pump water heater under the current environment; The target temperature rise rate is determined based on the water tank temperature and the ambient temperature. The target temperature rise rate is negatively correlated with the water tank temperature and positively correlated with the ambient temperature. The water tank temperature can be represented by T5, and the ambient temperature can be represented by T4.

[0053] For example, the water tank temperature can be collected by a water tank temperature sensor installed in the water tank of the heat pump water heater, and the ambient temperature can be collected by an ambient temperature sensor installed in the environment where the heat pump water heater is located.

[0054] For example, the heating demand of a heat pump water heater varies when the water tank temperature and the ambient temperature are different. Therefore, the target temperature rise rate that needs to be achieved can be determined based on the water tank temperature and the ambient temperature under the current environment.

[0055] For example, when the water tank temperature is low, the water temperature needs to be raised quickly to meet the user's water demand, so a high target temperature rise rate is set; when the water tank temperature is high, a low target temperature rise rate can be set to avoid the compressor operating beyond its limits; that is, the target temperature rise rate is negatively correlated with the water tank temperature. When the ambient temperature is high, the air heat source is sufficient, the evaporator has high heat absorption efficiency, and the compressor has a high energy efficiency ratio when running at high power; therefore, the target temperature rise rate is high at this time. When the ambient temperature of the heat pump water heater is low, the air heat source is scarce, the evaporator is prone to frosting, and if the compressor is forced to run at high power, it will lead to a significant drop in the energy efficiency ratio, a surge in energy consumption, and even triggering high-pressure protection shutdown; in this case, a low target temperature rise rate is set to allow the compressor to run smoothly at low power; that is, the target temperature rise rate is positively correlated with the ambient temperature.

[0056] For example, the mapping relationship between water tank temperature, ambient temperature and target temperature rise rate can be seen in Table 1 below.

[0057] Table 1

[0058] In Table 1 above, T4 represents the ambient temperature and T5 represents the water tank temperature. The target temperature rise rate is negatively correlated with the water tank temperature and positively correlated with the ambient temperature. That is, the target temperature rise rate decreases sequentially from left to right and from top to bottom.

[0059] In this embodiment, the target temperature rise rate is dynamically determined by combining the water tank temperature and ambient temperature of the heat pump water heater under the current environment. The higher the water tank temperature, the lower the target temperature rise rate; the higher the ambient temperature, the higher the target temperature rise rate. This ensures that the target temperature rise rate can reflect the heating demand of the current environment, improving the accuracy of the target temperature rise rate. Furthermore, when determining the target operating frequency of the compressor by combining the target temperature rise rate and the actual temperature rise rate, the accuracy of the target operating frequency can be further improved, ensuring that the compressor operation can meet the heating demand of the current environment.

[0060] In one implementation, after the heat pump water heater is turned on, a target difference between the exhaust temperature of the heat pump water heater and the water tank temperature is determined. The process of obtaining the actual temperature rise rate of a heat pump water heater under the current environment and the target temperature rise rate of the heat pump water heater may include: When the target difference is greater than or equal to the preset difference threshold, the actual temperature rise rate of the heat pump water heater in the current environment and the target temperature rise rate of the heat pump water heater are obtained.

[0061] The exhaust temperature refers to the temperature of the high-temperature, high-pressure refrigerant gas discharged from the compressor, which can be represented by Tp.

[0062] For example, after the heat pump water heater is turned on, the exhaust temperature and water tank temperature of the heat pump water heater are acquired, and a target difference between the exhaust temperature and the water tank temperature is determined. The target difference is the difference obtained by subtracting the water tank temperature from the exhaust temperature. The target difference reflects the establishment of the exhaust superheat of the heat pump water heater. When the target difference is greater than or equal to a preset difference threshold (e.g., 15°C), the exhaust superheat of the heat pump system is established, and the refrigerant at the evaporator outlet is in a superheated gaseous state. If the exhaust superheat is not established, the refrigerant may not be completely vaporized. When the liquid refrigerant enters the compressor, it will impact the compressor cylinder due to its inability to be compressed, causing damage to components such as valve plates and pistons. If the exhaust superheat is not established, the condenser inlet is in a two-phase state with a low enthalpy value. The system's heating capacity will be lower than after the exhaust superheat is established. At this time, the calculated temperature rise rate cannot reflect the unit's true heating capacity. Adjusting the compressor power based on this data will lead to control logic chaos. Therefore, once the exhaust superheat is established and the system's heating capacity is stable, the actual temperature rise rate of the heat pump water heater under the current environment and the target temperature rise rate of the heat pump water heater can be obtained.

[0063] For example, when exhaust superheat is not established, that is, when the target difference is less than the preset difference threshold, the opening of the throttling device or the compressor frequency in the heat pump water heater can be adjusted to make the target difference reach the preset difference threshold, thus completing the establishment of exhaust superheat and ensuring that the heat pump water heater is in a stable operating state.

[0064] For example, to avoid the possibility that prolonged failure to establish exhaust superheat might disrupt subsequent control of the heat pump water heater and thus fail to meet the user's water demand, a preset duration (e.g., 30 minutes) can be set for the operation time of the heat pump water heater. If exhaust superheat has not been established by the preset duration, the actual temperature rise rate of the heat pump water heater in the current environment and the target temperature rise rate of the heat pump water heater will continue to be acquired to ensure the normal control process of the heat pump water heater.

[0065] In this embodiment, after the heat pump water heater is turned on, the target difference between the exhaust temperature and the water tank temperature is calculated. Ensuring the target difference reaches a preset threshold, the actual temperature rise rate and the target temperature rise rate of the heat pump water heater are acquired, triggering frequency control of the compressor. By using the target difference between the exhaust temperature and the water tank temperature as the condition for triggering temperature rise rate control, precise adjustment is only initiated when the system has established a stable exhaust superheat. This avoids interference from unsteady-state data during initial startup, improving control reliability and adjustment accuracy.

[0066] In one implementation, a defrosting operation may be triggered during the operation of the heat pump water heater. If a defrosting operation is triggered, the current data calculation is canceled. After a preset time (e.g., 3 minutes) has elapsed since the defrosting operation was terminated, the actual and target temperature rise rates are recalculated to prioritize meeting the defrosting needs of the heat pump water heater and prevent the heating capacity of the heat pump water heater from being affected by frost buildup.

[0067] S202, based on the actual temperature rise rate and the target temperature rise rate, determine the target operating frequency.

[0068] For example, after obtaining the actual temperature rise rate and the target temperature rise rate of the heat pump water heater in the current environment, the target operating frequency of the compressor in the heat pump water heater is determined by combining the actual temperature rise rate and the target temperature rise rate.

[0069] In one implementation, the process of determining the target operating frequency based on the actual temperature rise rate and the target temperature rise rate may specifically include: The compressor's operating mode is determined based on the actual temperature rise rate and the target temperature rise rate. The target operating frequency is determined based on the compressor's operating mode.

[0070] For example, the relationship between the actual temperature rise rate and the target temperature rise rate can reflect the degree of matching between the heating demand and heating capacity of the heat pump water heater. Combining the two can determine the current adjustment mode of the compressor, i.e., the operating mode. First, based on the actual temperature rise rate and the target temperature rise rate of the heat pump water heater, the operating mode of the compressor is determined, and then the target operating frequency of the compressor is further determined based on the operating mode.

[0071] In this embodiment, the compressor's operating mode is first determined based on the actual temperature rise rate and the target temperature rise rate. Then, based on the compressor's operating mode, the specific target operating frequency is determined. By employing a hierarchical control strategy that determines the operating mode first and then the target frequency, the compressor's frequency adjustment becomes more targeted, improving the efficiency of determining the compressor's target operating frequency under different operating conditions.

[0072] In one implementation, the process of determining the compressor's operating mode based on the actual temperature rise rate and the target temperature rise rate may specifically include: When the actual temperature rise rate is greater than or equal to the target temperature rise rate, the compressor's operating mode is determined to be the first operating mode. In the first operating mode, the compressor operates at a fixed frequency. When the actual temperature rise rate is less than the target temperature rise rate, the compressor's operating mode is determined to be the second operating mode, which refers to the mode in which the compressor undergoes frequency compensation.

[0073] For example, different operating modes can be pre-configured for the compressor, which may include a first operating mode and a second operating mode. The first operating mode may also be called the normal operating mode, and the second operating mode may also be called the capacity compensation mode.

[0074] For example, the mapping relationship between the actual temperature rise rate, the target temperature rise rate, and the operating mode is pre-defined. When the actual temperature rise rate of the heat pump water heater is greater than or equal to the target temperature rise rate, it indicates that the heating capacity of the heat pump water heater has reached the expected effect under the current environment. At this time, the compressor's operating mode can be determined as the first operating mode, so that the compressor operates at a fixed frequency.

[0075] For example, when the actual temperature rise rate of the heat pump water heater is less than the target temperature rise rate, it indicates that the heat pump water heater has not achieved the expected heating effect under the current environment. In this case, the compressor's operating mode is determined to be the second operating mode to compensate for the compressor's frequency, thereby enabling the heat pump water heater to achieve the expected effect. That is, the compressor's operating frequency in the second operating mode is higher than that in the first operating mode.

[0076] In this embodiment, when the actual temperature rise rate is greater than or equal to the target temperature rise rate, the compressor's operating mode is determined to be a first operating mode, instructing the compressor to operate at a fixed frequency; when the actual temperature rise rate is less than the target temperature rise rate, the compressor's operating mode is determined to be a second operating mode, to compensate for the compressor's frequency. Based on the relationship between the actual and target temperature rise rates, distinguishing between the fixed-frequency first operating mode and the frequency-compensated second operating mode ensures stable operation and energy savings when heating capacity is sufficient, while also proactively compensating when capacity is insufficient, thus guaranteeing efficient hot water supply.

[0077] In one implementation, the process of determining the target operating frequency based on the compressor's operating mode may specifically include: When the compressor is in the first operating mode, the first preset frequency is set as the target operating frequency; When the compressor is in the second operating mode, the target operating frequency is determined based on the actual temperature rise rate.

[0078] For example, when the compressor's operating mode is determined to be the first operating mode, the first preset frequency can be set as the compressor's target operating frequency. For instance, for a household heat pump water heater, the first preset frequency can be set to 50Hz, etc.

[0079] For example, when the actual temperature rise rate of a heat pump water heater is different, the gap between the compressor's current heating capacity and the expected heating capacity will be different, and correspondingly, the degree of frequency compensation required for the compressor will differ. That is, when the compressor's operating mode is determined to be the second operating mode, the target operating rate of the compressor is further determined by combining the actual temperature rise rate.

[0080] In this embodiment, a corresponding preset frequency is matched for different operating modes. In the first operating mode, a fixed first preset frequency is used to ensure the operational stability of the heat pump water heater; in the second operating mode, the target operating frequency of the compressor is dynamically adjusted according to the actual temperature rise rate, so that the adjustment of the operating frequency is more in line with the actual temperature rise requirements, improving the accuracy of the target operating frequency, and thus improving the precision of the heating process.

[0081] In one implementation, the process of determining the target operating frequency based on the actual temperature rise rate may specifically include: When the actual temperature rise rate is greater than or equal to the first rate threshold, the second preset frequency is determined as the target operating frequency; When the actual temperature rise rate is less than the first rate threshold and greater than or equal to the second rate threshold, the third preset frequency is determined as the target operating frequency. When the actual temperature rise rate is less than the second rate threshold, the fourth preset frequency is determined as the target operating frequency; Among them, the first rate threshold is less than the target temperature rise rate, and the second rate threshold is less than the first rate threshold; the target operating frequencies, from smallest to largest, are the first preset frequency, the second preset frequency, the third preset frequency, and the fourth preset frequency.

[0082] For example, a first rate threshold (e.g., 0.8℃ / min) and a second rate threshold (e.g., 0) are preset for the temperature rise rate. When the actual temperature rise rate is greater than or equal to the first rate threshold, it falls within a higher temperature rise rate range. In this case, a second preset frequency, slightly higher than the first preset frequency, can be determined as the target operating frequency to meet the current demand for a lower temperature rise rate. When the actual temperature rise rate is between the first and second rate thresholds, a third preset frequency can be determined as the target operating frequency. When the actual temperature rise rate is less than the second rate threshold, a fourth preset frequency can be determined as the target operating frequency. In summary, the lower the actual temperature rise rate of the heat pump water heater, the higher the determined target operating frequency; conversely, the higher the actual temperature rise rate of the heat pump water heater, the lower the determined target operating frequency.

[0083] It should be noted that the setting of the first, second, third, and fourth preset frequencies also needs to be combined with the minimum and maximum frequencies of the heat pump water heater's compressor, as well as safety parameters such as system exhaust pressure and return gas pressure, to avoid the determined frequencies causing the compressor to fail to operate or to operate beyond its limits.

[0084] In one implementation, a first rate threshold can be determined based on the target temperature rise rate of the heat pump water heater in the current environment.

[0085] For example, when the target temperature rise rate is At that time, the first rate threshold can be determined. The value of X can range from 0.2 to 0.8.

[0086] For example, Figure 3 This is a schematic diagram illustrating a temperature rise rate range provided in an embodiment of this application. For example... Figure 3 As shown, Used to indicate the actual temperature rise rate of a heat pump water heater. For the target temperature rise rate, The first rate threshold is set to 0, and the second rate threshold is set to 0; when the actual temperature rise rate is greater than or equal to... When the actual temperature rise rate is within the specified range, the capacity compensation control is exited, and the compressor's operating mode is set to the first operating mode. At this time, the compressor's operating frequency is the first preset frequency. to When the actual temperature rise rate is within the range of 0 to 100°C, the compressor's operating frequency is determined to be the second preset frequency, which is greater than the first preset frequency; when the actual temperature rise rate is between 0 and 100°C... When the actual temperature rise rate is less than 0, the compressor operating frequency is determined to be the third preset frequency, which is greater than the second preset frequency; when the actual temperature rise rate is less than 0, the compressor operating frequency is determined to be the fourth preset frequency, which is greater than the third preset frequency.

[0087] Optionally, the first preset frequency, the second preset frequency, the third preset frequency, and the fourth preset frequency can be pre-calibrated frequency values. For example, the first preset frequency is A, the second preset frequency is B, the third preset frequency is C, and the fourth preset frequency is D. Alternatively, the second preset frequency, the third preset frequency, and the fourth preset frequency can be determined based on the first preset frequency and a preset adjustment amount. For example, if the first preset frequency is A, then the second preset frequency is A+△1, the third preset frequency is A+△2, and the fourth preset frequency is A+△3, where △1>△2>△3.

[0088] It should be noted that the above operating frequencies are described as examples. The specific operating frequency setting needs to be set in combination with parameters such as the model and specifications of the heat pump water heater, ambient temperature, water tank temperature, and heating demand. This application embodiment does not specifically limit the above values.

[0089] In this embodiment, when the actual temperature rise rate is greater than or equal to a first rate threshold, the target operating frequency is determined as a second preset frequency; when the actual temperature rise rate is between the first and second rate thresholds, the target operating frequency is determined as a third preset frequency; and when the actual temperature rise rate is less than the second rate threshold, the target operating frequency is determined as a fourth preset frequency. By setting multiple rate thresholds and corresponding preset frequencies, graded frequency compensation in the second operating mode is achieved. Specifically, the closer the temperature rise rate is to the target temperature rise rate, the smaller the frequency adjustment range, thereby efficiently reducing the gap between the actual and target temperature rise rates and improving the adaptability of the compressor's operating frequency to different environments.

[0090] S203 controls the operation of the compressor in the heat pump water heater based on the target operating frequency.

[0091] For example, after determining the target operating frequency by combining the target temperature rise rate and the actual temperature rise rate of the heat pump water heater, the compressor in the heat pump water heater can be controlled according to the target operating frequency so that the compressor operates at the currently determined target operating frequency, thereby meeting the heating demand under the current environment.

[0092] For example, the compressor is controlled to operate at a target operating frequency until the actual temperature rise rate of the heat pump water heater in the current environment reaches the corresponding target temperature rise rate.

[0093] In one implementation, during the operation of the compressor in the heat pump water heater, the current temperature rise rate and the current target temperature rise rate of the heat pump water heater are acquired at a preset time interval. The heat pump water heater is controlled based on the current temperature rise rate and the current target temperature rise rate.

[0094] For example, during the process of controlling the compressor to operate at the target operating frequency, the temperature rise rate of the heat pump water heater may change as the compressor operates. In order to ensure that the compressor can operate smoothly and that the operating frequency is in line with the current environmental conditions, during the operation of the compressor, the current temperature rise rate and the current target temperature rise rate of the heat pump water heater are acquired at preset time intervals, and the heat pump water heater is controlled accordingly by combining the current temperature rise rate and the current target temperature rise rate.

[0095] For example, the preset duration period is set to 10 minutes. Every 10 minutes when the compressor runs, the current temperature rise rate (indicating the actual temperature rise rate at the current moment) and the current target temperature rise rate of the heat pump water heater are acquired as the data collected for each duration period. Then, the heat pump water heater is controlled accordingly by combining the current temperature rise rate and the current target temperature rise rate collected from one or more duration periods.

[0096] In this embodiment of the application, during the operation of the compressor, the current temperature rise rate and the current target temperature rise rate of the heat pump water heater are continuously monitored at a preset time period and the heat pump water heater is controlled accordingly. This can respond in real time to temperature rise fluctuations caused by changes in the environment or load, ensuring that the heating capacity is always adapted to the heating needs of different environmental conditions.

[0097] In one implementation, the process of controlling the heat pump water heater based on the current temperature rise rate and the current target temperature rise rate may specifically include: When the current temperature rise rate is greater than or equal to the current target temperature rise rate, control the compressor to run at the first preset frequency; When the current temperature rise rate is less than the current target temperature rise rate, and the target number of cycles is less than or equal to the preset number of cycles, the compressor is controlled to run at the target operating frequency corresponding to the current temperature rise rate. When the current temperature rise rate is less than the current target temperature rise rate and the target number of cycles is greater than the preset number of cycles, the electric auxiliary heating device in the heat pump water heater is turned on. The target cycle number refers to the cumulative number of cycles during which a preset duration period is used to detect that the current temperature rise rate is less than the current target temperature rise rate.

[0098] For example, during the process of detecting the current temperature rise rate and the current target temperature rise rate of the heat pump water heater at preset time intervals, if the detected current temperature rise rate is greater than or equal to the current target temperature rise rate, it indicates that the heat pump water heater has achieved the expected effect, and the compressor can be controlled to operate at a first preset frequency. Specifically, if the compressor is currently in the first operating mode, it will continue to operate at its current operating frequency (i.e., the first preset frequency); if the compressor is currently in the second operating mode, its operating mode will be switched from the second operating mode to the first operating mode, that is, the compressor will be instructed to operate at the first preset frequency. The first preset frequency is less than the target operating frequency in the second operating mode.

[0099] For example, during the process of detecting the current temperature rise rate and the current target temperature rise rate of the heat pump water heater at preset time intervals, if the detected current temperature rise rate is less than the current target temperature rise rate, the target cycle count is incremented by 1. When the target cycle count is less than or equal to the preset cycle count (e.g., 3 cycles), the target operating frequency of the compressor is determined based on the current temperature rise rate of the heat pump water heater, and the compressor's operating frequency is dynamically adjusted to meet the current heating demand. When the target cycle count is greater than the preset cycle count, it indicates that adjusting the compressor frequency alone is insufficient to meet the heating demand under the current environment, and the electric auxiliary heating device in the heat pump water heater can be activated.

[0100] In one implementation, the heat pump water heater is equipped with a counter program that increments the counter value by 1 when the current temperature rise rate is less than the current target temperature rise rate, in order to accumulate the target number of cycles in which the current temperature rise rate is less than the current target temperature rise rate.

[0101] Optionally, when the electric auxiliary heating device is turned on, the compressor can continue to run at its current operating frequency, or the compressor can be controlled to run at a first preset frequency, or the compressor can be controlled to stop running. In this embodiment of the application, in order to improve the heating efficiency of the heat pump water heater and avoid low energy efficiency, it is preferable to control the compressor to run at a lower first preset frequency while controlling the electric auxiliary heating device to be turned on.

[0102] In this embodiment, the heat pump water heater is controlled according to the relationship between the current temperature rise rate and the current target temperature rise rate. If the current temperature rise rate has reached the current target temperature rise rate, the compressor can be controlled to operate at a lower first preset frequency to avoid unnecessary compressor output and energy waste. By linking the cycle counting with the electric auxiliary heating device, the problem of long-term temperature rise not meeting the target is solved. This avoids the limitations of relying solely on compressor regulation and can activate the electric auxiliary heating when necessary to ensure hot water supply and meet the user's water demand. At the same time, the counting threshold prevents the abuse of the electric auxiliary heating device and avoids excessive energy consumption.

[0103] In summary, this embodiment monitors the actual and target temperature rise rates of the heat pump water heater under the current environment; and based on these rates, determines the target operating frequency of the compressor in the heat pump water heater, controlling the compressor to operate at the target frequency. Compared to the prior art where the compressor operates at a fixed rated frequency, this solution adjusts the compressor's operating frequency based on the temperature rise rate under the current environment, ensuring that the heat pump water heater's heating capacity matches the temperature rise requirements of the current environment, thereby meeting the user's hot water needs.

[0104] Figure 4 This is a schematic flowchart illustrating another control method for a heat pump water heater provided in an embodiment of this application. It should be understood that this control method can be applied to a heat pump water heater; or, to a processor in a heat pump water heater; or, to a chip integrated into the processor of a heat pump water heater.

[0105] For example, such as Figure 4 As shown, the control method 300 includes: S301, in response to the start-up command of the heat pump water heater, obtains the exhaust temperature, water tank temperature and ambient temperature of the heat pump water heater under the current environment.

[0106] For example, after receiving the start command of the heat pump water heater, the exhaust temperature, water tank temperature and ambient temperature of the heat pump water heater under the current environment are monitored in real time.

[0107] S302 controls the target operating time of the heat pump water heater based on the exhaust temperature and water tank temperature.

[0108] The target duration is less than the preset duration, for example, 30 minutes.

[0109] For example, the exhaust superheat of the heat pump water heater is monitored based on the exhaust temperature and water tank temperature to determine whether exhaust superheat has been established. After the heat pump water heater is turned on, the target operating time is controlled until the target difference between the exhaust temperature and the water tank temperature is greater than or equal to a preset difference threshold (e.g., 15°C).

[0110] For example, if the target difference between the exhaust temperature and the water tank temperature can be greater than or equal to the preset difference threshold within a preset time period, then S303 can be executed at this moment; if the target difference between the exhaust temperature and the water tank temperature is continuously less than the preset difference threshold within a preset time period, then S303 is executed when the running time reaches the preset time period.

[0111] For example, during the operation of a heat pump water heater, the frequency of the compressor or the opening of the throttling device is adjusted to establish exhaust superheat, so that the target difference between the exhaust temperature and the water tank temperature reaches a preset difference threshold.

[0112] S303 determines the target temperature rise rate based on the water tank temperature and the ambient temperature, and determines the actual temperature rise rate based on the water tank temperature.

[0113] For example, after controlling the target operating time of the heat pump water heater, the target temperature rise rate that the heat pump water heater needs to achieve in the current environment is determined by combining the current water tank temperature and ambient temperature, and the actual temperature rise rate is determined based on the water tank temperature.

[0114] For example, the actual rate of temperature rise can indicate the rate at which the water in the tank of a heat pump water heater rises in temperature over a period of time (e.g., 10 minutes).

[0115] Optionally, the process for determining the target temperature rise rate can be found above. Figure 2 The relevant description of S201 in the present application will not be repeated here.

[0116] S304, determine whether the actual temperature rise rate is greater than or equal to the target temperature rise rate. If yes, proceed to S305; otherwise, proceed to S306.

[0117] For example, after determining the target temperature rise rate and the actual temperature rise rate, it is determined whether the actual temperature rise rate is greater than or equal to the target temperature rise rate.

[0118] S305 controls the compressor of the heat pump water heater to operate in the first operating mode, and the operating frequency of the compressor in the first operating mode is the first preset frequency.

[0119] For example, if the actual temperature rise rate is greater than or equal to the target temperature rise rate, it indicates that the heating capacity of the heat pump water heater has reached the expected effect. Then, the compressor in the heat pump water heater is controlled to operate in the first operating mode, that is, the target operating frequency of the compressor is determined to be a fixed first preset frequency.

[0120] S306 indicates that the second operating mode of the heat pump water heater has been activated. The second operating mode refers to the mode in which the compressor undergoes frequency compensation.

[0121] For example, if the actual temperature rise rate is less than the target temperature rise rate, the heating capacity of the heat pump water heater will not achieve the expected effect, which will affect the user's normal water use. In this case, the second operating mode of the heat pump water heater can be turned on to compensate the compressor frequency.

[0122] S307, when the actual temperature rise rate is greater than or equal to the first rate threshold, controls the compressor to operate at a second preset frequency, which is greater than the first preset frequency.

[0123] For example, when the second operating mode is activated, when the actual temperature rise rate is greater than or equal to the first rate threshold, that is, when the actual temperature rise rate is within the range between the target temperature rise rate and the first rate threshold, the compressor is controlled to operate at a second preset frequency, which is greater than the first preset frequency in the first operating mode.

[0124] Optionally, the second preset frequency can be a pre-set value or it can be determined based on the first preset frequency. For example, the second preset frequency can be obtained by adding a first adjustment amount to the first preset frequency.

[0125] S308, when the actual temperature rise rate is less than the first rate threshold and greater than or equal to the second rate threshold, controls the compressor to operate at a third preset frequency, which is greater than the second preset frequency.

[0126] For example, when the second operating mode is activated, if the actual temperature rise rate is within the range between the first rate threshold and the second rate threshold, the compressor is controlled to operate at a third preset frequency, which is greater than the second preset frequency.

[0127] Optionally, the third preset frequency can be a pre-set value or determined based on the first preset frequency. For example, a second adjustment amount can be added to the first preset frequency to obtain the third preset frequency, where the second adjustment amount is greater than the first adjustment amount.

[0128] S309, when the actual temperature rise rate is less than the second rate threshold, controls the compressor to run at the fourth preset frequency, which is greater than the third preset frequency.

[0129] For example, when the second operating mode is activated, if the actual temperature rise rate is less than the second rate threshold, the compressor is controlled to operate at a fourth preset frequency, which is greater than the third preset frequency.

[0130] Optionally, the fourth preset frequency can be a pre-set value or determined based on the first preset frequency. For example, a third adjustment amount can be added to the first preset frequency to obtain the fourth preset frequency, where the third adjustment amount is greater than the second adjustment amount.

[0131] S310: After a preset running time, determine whether the current actual temperature rise rate is greater than or equal to the target temperature rise rate. If yes, execute S305; otherwise, execute S311.

[0132] For example, during the operation of the compressor, after each preset running time (e.g., 10 minutes), it is determined again whether the actual temperature rise rate at the current moment is greater than or equal to the target temperature rise rate.

[0133] For example, if the actual temperature rise rate is greater than or equal to the target temperature rise rate, the compressor of the heat pump water heater is controlled to operate in the first operating mode, that is, the operating frequency of the compressor is adjusted to the first preset frequency.

[0134] S311: Increment the counter by 1 and determine if the counter value is greater than a preset value. If yes, execute S312; otherwise, execute S306.

[0135] For example, whenever the current actual temperature rise rate is detected to be less than the target temperature rise rate, the control counter is incremented by 1, and the counter value is continuously checked to see if it is greater than a preset value (e.g., 3 times).

[0136] For example, if the counter value is less than or equal to a preset value, the second operating mode of keeping the compressor running will be maintained, and frequency compensation will be performed on the compressor.

[0137] S312 controls the compressor to run at a first preset frequency and turns on the electric auxiliary heating device until the actual temperature rise rate is greater than or equal to the target temperature rise rate.

[0138] For example, if the counter value is detected to be greater than a preset value, the compressor is controlled to run at a first preset frequency, and the electric auxiliary heating device in the heat pump water heater is turned on, indicating that the actual temperature rise rate of the heat pump water heater under the current environment is greater than or equal to the target temperature rise rate.

[0139] In summary, this embodiment combines multi-dimensional data of exhaust temperature, water tank temperature, and ambient temperature. After ensuring the heat pump water heater establishes exhaust superheat, the compressor frequency is adjusted to ensure stable operation. Simultaneously, a precise reference benchmark is set for the target and actual temperature rise rate. Based on the relationship between these two factors, the compressor's operating mode is switched in stages, matching different preset frequencies. This ensures the heating power of the heat pump water heater precisely matches the hot water temperature demand, avoiding energy waste due to excessive power or slow heating due to insufficient power. Furthermore, a counting and prediction mechanism is used to promptly activate the electric auxiliary heating device, preventing long-term temperature rise failures from affecting the user experience. Overall, this solution improves the heating efficiency and energy utilization of the water heater under different operating conditions, ensures smoother system operation, reduces equipment wear, and guarantees the efficiency and stability of the hot water supply for users.

[0140] The above text combined Figures 1 to 4 The control method of the heat pump water heater provided in the embodiments of this application is described in detail below; the following will be combined with Figure 5 and Figure 6 The apparatus embodiments of this application are described in detail below. It should be understood that the apparatus in the embodiments of this application can perform the various methods described in the foregoing embodiments of this application, that is, the specific working processes of the various products described below can be referred to the corresponding processes in the foregoing method embodiments.

[0141] Figure 5 This is a schematic diagram of the structure of a control device for a heat pump water heater provided in an embodiment of this application.

[0142] For example, such as Figure 5 As shown, the control device 400 includes: The acquisition module 401 is used to acquire the actual temperature rise rate of the heat pump water heater under the current environment and the target temperature rise rate of the heat pump water heater. The processing module 402 is used to determine the target operating frequency based on the actual temperature rise rate and the target temperature rise rate; and to control the operation of the compressor in the heat pump water heater based on the target operating frequency.

[0143] In one possible implementation, the processing module 402 is further configured to determine the compressor's operating mode based on the actual temperature rise rate and the target temperature rise rate; and to determine the target operating frequency based on the compressor's operating mode.

[0144] In one possible implementation, the processing module 402 is further configured to determine the compressor's operating mode as a first operating mode when the actual temperature rise rate is greater than or equal to the target temperature rise rate, wherein the compressor operates at a fixed frequency in the first operating mode; and to determine the compressor's operating mode as a second operating mode when the actual temperature rise rate is less than the target temperature rise rate, wherein the second operating mode refers to a mode in which the compressor undergoes frequency compensation.

[0145] In one possible implementation, the processing module 402 is further configured to determine the first preset frequency as the target operating frequency when the compressor is in the first operating mode; and to determine the target operating frequency based on the actual temperature rise rate when the compressor is in the second operating mode.

[0146] In one possible implementation, the processing module 402 is further configured to: determine a second preset frequency as the target operating frequency when the actual temperature rise rate is greater than or equal to a first rate threshold; determine a third preset frequency as the target operating frequency when the actual temperature rise rate is less than the first rate threshold but greater than or equal to the second rate threshold; and determine a fourth preset frequency as the target operating frequency when the actual temperature rise rate is less than the second rate threshold. The first rate threshold is less than the target temperature rise rate, and the second rate threshold is less than the first rate threshold. The target operating frequencies, from smallest to largest, are the first preset frequency, the second preset frequency, the third preset frequency, and the fourth preset frequency.

[0147] In one possible implementation, the acquisition module 401 is further used to acquire the water tank temperature and ambient temperature of the heat pump water heater in the current environment; the processing module 402 is further used to determine the target temperature rise rate based on the water tank temperature and the ambient temperature; wherein the target temperature rise rate is negatively correlated with the water tank temperature and positively correlated with the ambient temperature.

[0148] In one possible implementation, the processing module 402 is further configured to determine the target difference between the exhaust temperature of the heat pump water heater and the water tank temperature after the heat pump water heater is turned on; the acquisition module 401 is further configured to acquire the actual temperature rise rate of the heat pump water heater in the current environment and the target temperature rise rate of the heat pump water heater when the target difference is greater than or equal to a preset difference threshold.

[0149] In one possible implementation, the processing module 402 is further configured to acquire the current temperature rise rate and the current target temperature rise rate of the heat pump water heater at a preset time period during the process of controlling the operation of the compressor in the heat pump water heater; and control the heat pump water heater based on the current temperature rise rate and the current target temperature rise rate.

[0150] In one possible implementation, the processing module 402 is further configured to: control the compressor to operate at a first preset frequency when the current temperature rise rate is greater than or equal to the current target temperature rise rate; control the compressor to operate at a target operating frequency corresponding to the current temperature rise rate when the current temperature rise rate is less than the current target temperature rise rate and the target number of cycles is less than or equal to the preset number of cycles; and control the electric auxiliary heating device in the heat pump water heater to turn on when the current temperature rise rate is less than the current target temperature rise rate and the target number of cycles is greater than the preset number of cycles; wherein, the target number of cycles refers to the cumulative number of cycles for a preset duration period during which the current temperature rise rate is less than the current target temperature rise rate.

[0151] It should be noted that the control device of the aforementioned heat pump water heater is embodied in the form of functional units. The term "module" here can be implemented in software and / or hardware, without specific limitations.

[0152] For example, a "module" can be a software program, a hardware circuit, or a combination of both that implements the above functions. The hardware circuit may include an application-specific integrated circuit (ASIC), electronic circuits, a processor (e.g., a shared processor, a proprietary processor, or a group processor) and memory for executing one or more software or firmware programs, integrated logic circuits, and / or other suitable components that support the described functions.

[0153] Therefore, the units of the various examples described in the embodiments of this application can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0154] Figure 6 This is a schematic diagram of the structure of a heat pump water heater provided in an embodiment of this application.

[0155] For example, such as Figure 6 As shown, the heat pump water heater 100 includes a memory 501 and a processor 502. The memory 501 stores executable program code 503, and the processor 502 is used to call and execute the executable program code 503 to perform a control method for the heat pump water heater.

[0156] Furthermore, this application also protects an apparatus that may include a memory and a processor, wherein the memory stores executable program code, and the processor is used to call and execute the executable program code to perform a control method for a heat pump water heater provided in this application.

[0157] This embodiment can divide the device into functional modules based on the above method example. For example, each module can correspond to a separate function, or two or more functions can be integrated into one processing module. The integrated module can be implemented in hardware. It should be noted that the module division in this embodiment is illustrative and only represents one logical functional division. In actual implementation, there may be other division methods.

[0158] When the functional modules are divided according to their respective functions, the device may also include an acquisition module, a processing module, etc. It should be noted that all relevant content of each step involved in the above method embodiments can be referenced to the functional description of the corresponding functional module, and will not be repeated here.

[0159] It should be understood that the device provided in this embodiment is used to execute the control method of the heat pump water heater described above, and therefore can achieve the same effect as the above implementation method.

[0160] When using an integrated unit, the device may include a processing module and a storage module. Specifically, when the device is applied to a heat pump water heater, the processing module can be used to control and manage the operation of the heat pump water heater. The storage module can be used to support the heat pump water heater in executing relevant program code, etc.

[0161] The processing module may be a processor or a controller, which can implement or execute the various exemplary logic blocks, modules, and circuits described in conjunction with the disclosure of this application. The processor may also be a combination of functions that implement computing capabilities, such as a combination of one or more microprocessors, a combination of digital signal processing (DSP) and a microprocessor, etc., and the storage module may be a memory.

[0162] In addition, the device provided in the embodiments of this application may specifically be a chip, component or module. The chip may include a connected processor and a memory. The memory is used to store instructions. When the processor calls and executes the instructions, the chip can execute the control method of a heat pump water heater provided in the above embodiments.

[0163] This embodiment also provides a computer-readable storage medium storing computer program code. When the computer program code is run on a computer, the computer executes the above-described related method steps to implement the control method for a heat pump water heater provided in the above embodiment.

[0164] The computer-readable storage medium may include, but is not limited to, any type of disk, including floppy disks, optical disks, Digital Video Discs (DVDs), Compact Disc Read-Only Memory (CD-ROMs), microdrives, and magneto-optical disks, read-only memory (ROMs), random access memory (RAMs), erasable programmable read-only memory (EPROMs), electrically erasable programmable read-only memory (EEPROMs), dynamic random access memory (DRAMs), video random access memory (VRAMs), flash memory devices, magnetic cards or optical cards, nanosystems (including molecular memory ICs), or any type of medium or device suitable for storing instructions and / or data.

[0165] This embodiment also provides a computer program product. When the computer program product is run on a computer, it causes the computer to perform the above-mentioned related steps to realize the control method of a heat pump water heater provided in the above embodiment.

[0166] In this embodiment, the device, computer-readable storage medium, computer program product, or chip are all used to execute the corresponding methods provided above. Therefore, the beneficial effects they can achieve can be referred to the beneficial effects in the corresponding methods provided above, and will not be repeated here.

[0167] Through the above description of the embodiments, those skilled in the art will understand that, for the sake of convenience and brevity, only the division of the above functional modules is used as an example. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0168] In the embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another device, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0169] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A control method for a heat pump water heater, characterized in that, The control method includes: Obtain the actual temperature rise rate of the heat pump water heater under the current environment and the target temperature rise rate of the heat pump water heater; The target operating frequency is determined based on the actual temperature rise rate and the target temperature rise rate; The compressor in the heat pump water heater is controlled to operate based on the target operating frequency.

2. The control method according to claim 1, characterized in that, Determining the target operating frequency based on the actual temperature rise rate and the target temperature rise rate includes: The operating mode of the compressor is determined based on the actual temperature rise rate and the target temperature rise rate. The target operating frequency is determined based on the compressor's operating mode.

3. The control method according to claim 2, characterized in that, Determining the compressor's operating mode based on the actual temperature rise rate and the target temperature rise rate includes: When the actual temperature rise rate is greater than or equal to the target temperature rise rate, the compressor is determined to operate in a first operating mode. In the first operating mode, the compressor operates at a fixed frequency. When the actual temperature rise rate is less than the target temperature rise rate, the compressor is determined to operate in a second operating mode, which is a mode for frequency compensation of the compressor.

4. The control method according to claim 2, characterized in that, Determining the target operating frequency based on the compressor's operating mode includes: When the compressor is in the first operating mode, the first preset frequency is determined as the target operating frequency; When the compressor is operating in the second operating mode, the target operating frequency is determined based on the actual temperature rise rate.

5. The control method according to claim 4, characterized in that, Determining the target operating frequency based on the actual temperature rise rate includes: When the actual temperature rise rate is greater than or equal to the first rate threshold, the second preset frequency is determined as the target operating frequency; When the actual temperature rise rate is less than the first rate threshold and greater than or equal to the second rate threshold, the third preset frequency is determined as the target operating frequency. When the actual temperature rise rate is less than the second rate threshold, the fourth preset frequency is determined as the target operating frequency; Wherein, the first rate threshold is less than the target temperature rise rate, and the second rate threshold is less than the first rate threshold; the target operating frequencies, in ascending order, are the first preset frequency, the second preset frequency, the third preset frequency, and the fourth preset frequency.

6. The control method according to any one of claims 1 to 5, characterized in that, The control method further includes: Obtain the water tank temperature and ambient temperature of the heat pump water heater under the current environment; The target temperature rise rate is determined based on the water tank temperature and the ambient temperature. The target temperature rise rate is negatively correlated with the water tank temperature and positively correlated with the ambient temperature.

7. The control method according to any one of claims 1 to 5, characterized in that, The control method further includes: After the heat pump water heater is turned on, determine the target difference between the exhaust temperature of the heat pump water heater and the water tank temperature; The step of obtaining the actual temperature rise rate of the heat pump water heater under the current environment and the target temperature rise rate of the heat pump water heater includes: When the target difference is greater than or equal to a preset difference threshold, the actual temperature rise rate of the heat pump water heater in the current environment and the target temperature rise rate of the heat pump water heater are obtained.

8. The control method according to any one of claims 3 to 5, characterized in that, The control method further includes: During the process of controlling the operation of the compressor in the heat pump water heater, the current temperature rise rate and the current target temperature rise rate of the heat pump water heater are acquired at a preset time interval. The heat pump water heater is controlled based on the current temperature rise rate and the current target temperature rise rate.

9. The control method according to claim 8, characterized in that, The control of the heat pump water heater based on the current temperature rise rate and the current target temperature rise rate includes: When the current temperature rise rate is greater than or equal to the current target temperature rise rate, the compressor is controlled to operate at a first preset frequency; When the current temperature rise rate is less than the current target temperature rise rate, and the target number of cycles is less than or equal to the preset number of cycles, the compressor is controlled to operate at the target operating frequency corresponding to the current temperature rise rate. When the current temperature rise rate is less than the current target temperature rise rate and the target number of cycles is greater than the preset number of cycles, the electric auxiliary heating device in the heat pump water heater is controlled to turn on. The target cycle number refers to the cumulative number of cycles during which the current temperature rise rate is less than the current target temperature rise rate for a preset duration.

10. A heat pump water heater, characterized in that, The heat pump water heater includes: Memory, used to store executable program code; A processor is configured to call and run the executable program code from the memory, causing the heat pump water heater to perform the method as described in any one of claims 1 to 9.

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