Heat pump water heater control method, device and system and water heater

Abstract

The invention discloses a heat pump water heater control method, device and system and a water heater, and belongs to the field of heat pump water heaters. The control method is applied to the static heating type heat pump water heater, and when the heat pump water heater operates stably, the outdoor environment temperature and the condensation temperature are obtained; based on the operation mode of the heat-pump water heater, the theoretical water temperature of the upper portion of a water tank of the heat-pump water heater is determined according to the outdoor environment temperature and the condensation temperature, and finally the heat-pump water heater is controlled based on the theoretical water temperature. According to the scheme, a sensor does not need to be arranged on the upper portion of the water tank of the heat pump water heater, the temperature can be obtained only according to the outdoor environment temperature and the condensation temperature, in the production design stage, the assembly workload of the water tank temperature sensing bulb can be reduced, production and product material cost is reduced, production time is shortened, and production efficiency is improved; and various fault problems caused by the influence of the water tank temperature sensing bulb assembly can be avoided after sale.

Description

Technical Field

[0001] The present application relates to the technical field of heat pump water heaters, and in particular, to a heat pump water heater control method, device, system and water heater. Background Art

[0002] In a static heating heat pump water heater, in order to realize various functions of the unit control, it is usually necessary to collect physical state parameters such as the water temperature of the water tank and the exhaust pressure of the refrigerant system. Among them, in terms of collecting the water temperature of the water tank, a thermistor wired temperature sensing package is usually used as the temperature sensor of the water tank to realize the monitoring and transmission of the water temperature of the water tank.

[0003] However, installing a temperature sensor in the water tank requires additional assembly work, which increases time and material costs. In addition, the temperature sensor installed in the water tank often fails, making after-sales maintenance very inconvenient. Summary of the invention

[0004] In order to overcome the deficiencies of the prior art, the present application provides a heat pump water heater control method, device, system and water heater to solve the problem that setting a temperature sensor in a water tank requires additional assembly work, increases time cost and material cost, and in addition, the temperature sensor set in the water tank often fails, making after-sales maintenance very inconvenient.

[0005] The technical solution adopted by this application to solve its technical problem is:

[0006] In a first aspect, a heat pump water heater control method is provided, which is applied to a static heating heat pump water heater, and the method comprises:

[0007] When the heat pump water heater is running stably, obtain the outdoor ambient temperature and condensing temperature;

[0008] Based on the operation mode of the heat pump water heater, determining the theoretical water temperature of the upper part of the water tank of the heat pump water heater according to the outdoor ambient temperature and the condensing temperature;

[0009] The heat pump water heater is controlled based on the theoretical water temperature.

[0010] Further, the determining of the theoretical water temperature at the upper part of the water tank of the heat pump water heater based on the operation mode of the heat pump water heater and the outdoor ambient temperature and the condensing temperature comprises:

[0011] When the heat pump water heater is not in defrosting mode, obtaining a first water temperature based on the outdoor ambient temperature at a current moment and the condensing temperature at a current moment;

[0012] The first water temperature is used as the theoretical water temperature of the upper part of the water tank of the heat pump water heater.

[0013] Further, obtaining the first water temperature based on the outdoor ambient temperature at the current moment and the condensation temperature at the current moment includes:

[0014] The first water temperature is obtained by using a pre-fitted formula, the outdoor ambient temperature at the current moment and the condensation temperature at the current moment.

[0015] Furthermore, the formula is as follows:

[0016] The first water temperature=the first fitting coefficient*the outdoor ambient temperature at the current moment*the condensation temperature at the current moment+the second fitting coefficient*the outdoor ambient temperature at the current moment+the third fitting coefficient*the condensation temperature at the current moment+the fourth fitting coefficient.

[0017] Further, the determining of the theoretical water temperature at the upper part of the water tank of the heat pump water heater based on the operation mode of the heat pump water heater and the outdoor ambient temperature and the condensing temperature comprises:

[0018] When the heat pump water heater is in defrost mode, the outdoor environment temperature at a historical moment and the condensation temperature at a historical moment are obtained to obtain a second water temperature, wherein the historical moment is a moment of a preset time before entering the defrost mode;

[0019] The second water temperature is used as the theoretical water temperature of the upper part of the water tank of the heat pump water heater.

[0020] Furthermore, it also includes:

[0021] If the difference between the target parameter at the current moment and the target parameter at the previous moment is less than the preset difference, it is determined that the heat pump water heater is operating stably;

[0022] If the difference between the target parameter at the current moment and the target parameter at the previous moment is greater than or equal to the preset difference, it is determined that the heat pump water heater is operating unstably;

[0023] The target parameter includes any one of the following:

[0024] Exhaust pressure, condensing temperature, high pressure, exhaust temperature.

[0025] Furthermore, it also includes:

[0026] Obtaining the exhaust pressure of the heat pump water heater;

[0027] The condensing temperature is determined based on the exhaust pressure.

[0028] In a second aspect, a heat pump water heater control device is provided, which is applied to a static heating heat pump water heater, and the device comprises:

[0029] A parameter acquisition module, used to obtain the outdoor ambient temperature and condensing temperature when the heat pump water heater is running stably;

[0030] A water temperature determination module, for determining a theoretical water temperature at an upper portion of a water tank of the heat pump water heater according to an operation mode of the heat pump water heater, the outdoor ambient temperature and a condensing temperature;

[0031] The water heater control module is used to control the heat pump water heater based on the theoretical water temperature.

[0032] In a third aspect, a heat pump water heater control system is provided, comprising:

[0033] at least one processor and at least one memory;

[0034] The memory stores executable instructions of the processor;

[0035] The processor is configured to execute the above-mentioned heat pump water heater control method.

[0036] In a fourth aspect, a water heater is provided, applying the above-mentioned heat pump water heater control method.

[0037] Beneficial effects:

[0038] The technical solution of the present application provides a heat pump water heater control method, device, system and water heater. The control method is applied to a static heating heat pump water heater. When the heat pump water heater is running stably, the outdoor ambient temperature and the condensing temperature are obtained; then, based on the operation mode of the heat pump water heater, the theoretical water temperature of the upper part of the water tank of the heat pump water heater is determined according to the outdoor ambient temperature and the condensing temperature, and finally the heat pump water heater is controlled based on the theoretical water temperature. In the present application solution, the heat pump water heater does not need to be provided with a sensor on the upper part of the water tank, but only needs to obtain the temperature according to the outdoor ambient temperature and the condensing temperature. In the production design stage, the assembly workload of the water tank temperature sensor package can be reduced, the production and product material costs can be reduced, the production hours can be reduced, and the production efficiency can be improved. In after-sales service, various failure problems caused by the influence of the water tank temperature sensor package assembly can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0040] Figure 1 is a flow chart of a heat pump water heater control method provided in an embodiment of the present application;

[0041] Figure 2 is a flow chart of a specific heat pump water heater control method provided in an embodiment of the present application;

[0042] Figure 3 It is a schematic diagram of the structure of a heat pump water heater control device provided in an embodiment of the present application;

[0043] Figure 4 It is a schematic diagram of the structure of a heat pump water heater control system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme of the present application is described in detail below in conjunction with the accompanying drawings and embodiments. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other implementation methods obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present application.

[0045] The static heating heat pump water heater includes a heat pump unit (i.e., compressor, evaporator, expansion valve, condenser and related components) and a water tank. The condenser is arranged inside or outside the water tank, and the water in the water tank is heated by the condenser. That is, the water does not circulate in the water tank during heating.

[0046] It should be noted that the opposite of the static heating type heat pump water heater is the circulating heating type condenser, which circulates and heats all the water (dynamic heating method); that is, the water is circulated through a water pump, etc., and heat is exchanged with the condenser at a certain point. Since a water tank is generally not set up and the water temperature of each section in the circulation loop is quite different, it is not suitable for the present application scheme.

[0047] Reference Figure 1 The present application embodiment provides a heat pump water heater control method, which is applied to a static heating heat pump water heater, and the method includes:

[0048] S11: when the heat pump water heater is running stably, obtaining the outdoor ambient temperature and the condensing temperature;

[0049] In one embodiment, the condensing temperature is measured by a temperature sensor, and in another embodiment, the condensing temperature is determined according to the exhaust pressure or the high pressure pressure.

[0050] It should be noted that the stable operation of the heat pump water heater in this application refers to normal and stable operation. It can be understood that it is necessary to control the heat pump water heater only under normal circumstances, and only directly send an alarm when it is abnormal, such as lighting a red light, emitting a buzzer, and displaying a preset fault code on the display panel, or sending a message through WeChat, SMS, APP, etc. In addition, the purpose of limiting stable operation is to allow the heat pump water heater to operate normally, but there will be a problem of condensing temperature fluctuations during the startup phase. At this time, the theoretical water temperature at the top of the water tank obtained based on the outdoor ambient temperature and the condensing temperature is inaccurate. The judgment of whether the heat pump water heater is operating stably is determined based on parameters such as exhaust pressure. Specifically:

[0051] If the difference between the target parameter at the current moment and the target parameter at the previous moment is less than the preset difference, it is determined that the heat pump water heater is operating stably;

[0052] If the difference between the target parameter at the current moment and the target parameter at the previous moment is greater than or equal to the preset difference, it is determined that the heat pump water heater is operating unstably;

[0053] The target parameter includes any one of the following:

[0054] Exhaust pressure, condensing temperature, high pressure, exhaust temperature.

[0055] S12: Based on the operation mode of the heat pump water heater, determine the theoretical water temperature of the upper part of the water tank of the heat pump water heater according to the outdoor ambient temperature and the condensation temperature.

[0056] In one embodiment, the determining of the theoretical water temperature at the upper portion of the water tank of the heat pump water heater based on the operating mode of the heat pump water heater and the outdoor ambient temperature and the condensing temperature comprises:

[0057] When the heat pump water heater is not in defrost mode, a first water temperature is obtained based on the outdoor ambient temperature at the current moment and the condensation temperature at the current moment; the first water temperature is used as the theoretical water temperature of the upper part of the water tank of the heat pump water heater. Because when the heat pump water heater is not in defrost mode, the first water temperature obtained based on the outdoor ambient temperature at the current moment and the condensation temperature at the current moment can accurately represent the theoretical water temperature of the upper part of the water tank, so the first water temperature is directly used as the theoretical water temperature of the upper part of the water tank.

[0058] As a preferred implementation of the embodiment of the present application, obtaining the first water temperature based on the outdoor ambient temperature at the current moment and the condensation temperature at the current moment includes:

[0059] The first water temperature is obtained by using the formula obtained by pre-fitting, the outdoor ambient temperature at the current moment and the condensing temperature at the current moment. The formula is fitted based on the data measured in advance, that is, by pre-measuring the upper temperature of the water tank at different outdoor ambient temperatures and different condensing temperatures. Then, parameter fitting is performed with the theoretical water temperature as the dependent variable, and the outdoor ambient temperature and condensing temperature as the independent variables, and the fitted formula is used as the formula of the heat pump water heater. In fact, the same formula can be used for the same model. If you want to be precise, you can test each heat pump water heater.

[0060] Exemplarily, the formula is as follows:

[0061] First water temperature = first fitting coefficient * current outdoor ambient temperature * current condensing temperature + second fitting coefficient * current outdoor ambient temperature + third fitting coefficient * current condensing temperature + fourth fitting coefficient. Among them, the first fitting coefficient, the second fitting coefficient, the third fitting coefficient and the fourth fitting coefficient are the data obtained by fitting. It can be understood that the formulas obtained by different models may only have four different fitting coefficients, or the entire formula may be different.

[0062] During defrosting, the theoretical water temperature at the top of the water tank cannot be accurately represented due to the change in condensation temperature, so the theoretical water temperature cannot be determined by a fitting formula. Therefore, a default value can be directly set (different at different outdoor ambient temperatures). Alternatively, the theoretical water temperature before defrosting is used as the current theoretical water temperature. Specifically, when the heat pump water heater is in defrosting mode, the outdoor ambient temperature at a historical moment and the condensation temperature at a historical moment are obtained to obtain a second water temperature, where the historical moment is a moment of a preset time before entering the defrosting mode; the second water temperature is used as the theoretical water temperature at the top of the water tank of the heat pump water heater.

[0063] S13: Controlling the heat pump water heater based on the theoretical water temperature.

[0064] In traditional static heating heat pump water heaters, the cold water inlet is generally located at the bottom of the water tank. Therefore, when the user uses water, the changes in the lower part of the water tank will be very drastic. Therefore, in traditional static heating heat pump water heaters, a sensor is generally provided at the top and bottom of the water tank respectively, and the control of the heat pump water heater is determined by the temperatures of the two sensors. The specific control method has not been improved in this application and will not be given as an example here.

[0065] In the embodiment of the present application, the theoretical water temperature determined according to the outdoor ambient temperature and the condensation temperature can only be used as the theoretical water temperature of the upper part. In one embodiment, the acquisition of the lower temperature is calculated according to the cold water inlet amount. Specifically, when the user does not inlet water, the temperature difference between the upper and lower parts is basically fixed, so a lower theoretical water temperature can be obtained according to the theoretical water temperature of the upper part, and then the lower temperature is obtained by combining the cold water inlet amount and the cold water temperature (the more cold water inlet amount, the greater the difference between the lower theoretical water temperature and the lower temperature; the lower the cold water temperature, the greater the difference between the lower theoretical water temperature and the lower temperature). The cold water inlet amount is calculated according to the valve opening and opening time of the cold water inlet circuit, and the cold water temperature is measured by a temperature sensor (such as a temperature sensing package) set in the cold water inlet circuit. In some water heaters, a temperature sensor is set in the cold water inlet circuit, so no additional setting is required. Even if the water heater does not set a temperature sensor in the cold water inlet circuit, according to the scheme of this embodiment, only one temperature sensor needs to be installed, and it does not need to be installed in the water tank.

[0066] In another embodiment, the lower temperature is directly obtained in a conventional manner, that is, a temperature sensor is arranged at the lower part of the water tank. Compared with the prior art, only one temperature sensor needs to be installed, and the lower temperature which changes frequently can be directly obtained without calculation.

[0067] The heat pump water heater control method provided in the embodiment of the present application obtains the outdoor ambient temperature and the condensing temperature when the heat pump water heater is running stably; then, based on the operation mode of the heat pump water heater, the theoretical water temperature of the upper part of the water tank of the heat pump water heater is determined according to the outdoor ambient temperature and the condensing temperature, and finally the heat pump water heater is controlled based on the theoretical water temperature. In the present application scheme, the heat pump water heater does not need to be provided with a sensor on the upper part of the water tank, and only needs to obtain it according to the outdoor ambient temperature and the condensing temperature. In the production design stage, it can reduce the assembly workload of the water tank temperature sensing package, reduce the production and product material costs, reduce the production hours and improve the production efficiency, and avoid various failure problems caused by the influence of the water tank temperature sensing package components in after-sales.

[0068] In order to further illustrate the present application scheme, Figure 2 As shown, a specific heat pump water heater control method is provided:

[0069] The water temperature in the upper part of the water tank corresponding to different ambient temperatures and condensing temperatures under typical working conditions is shown in Table 1.

[0070] Table 1

[0071]

[0072]

[0073] Among them, according to the data in the water temperature table of the middle and upper part of the water tank corresponding to different ambient temperatures and condensing temperatures under typical working conditions, the water temperature T3 of the middle and upper part of the water tank is taken as the dependent variable, and the ambient temperature T1 and the condensing temperature T2 are taken as the independent variables. The polynomial T3=a*T1*T2+b*T2+c*T1+d is fitted to obtain the water temperature of the middle and upper part of the water tank:

[0074] T3 = 0.0032*T1*T2+1.1723*T2-0.2725*T1-13.979. The water temperature control algorithm flow of the middle and upper part of the water tank mainly includes steps S101 to S108.

[0075] The specific implementation is as follows:

[0076] When the unit is started, it enters step S101, and the pressure sensor of the heat pump unit monitors the exhaust pressure Pc once every 5 seconds, and the ambient temperature sensor monitors the ambient temperature once every 5 seconds.

[0077] Then, the process enters step S102 to calculate the latest exhaust pressure Pc monitored and the P*c monitored the last time. When the absolute value of the difference between the two is ≥ 2 kPa, the process re-enters step S102 for cyclic calculation.

[0078] When the absolute value of the difference between the two is less than 2 kPa, the process proceeds to step S103 to calculate the corresponding saturation temperature, ie, the condensation temperature T2, according to the most recently monitored exhaust pressure Pc.

[0079] Then enter step S104, according to the latest monitored ambient temperature T1, condensation temperature T2, according to the formula T3 = 0.0032 * T1 * T2 + 1.1723 * T2 - 0.2725 * T1 - 13.979, calculate the upper temperature T3 of the water tank.

[0080] In step S105, it is determined whether the unit has entered the defrosting process. If the unit is not in the defrosting process, it enters step S107, outputs the latest calculated water temperature value T3 in the upper part of the water tank, and uses this value to enter the control logic for the rest of normal operation.

[0081] When the unit enters the defrost process, the upper water temperature value T3* of the water tank calculated 30 seconds before entering the defrost process is used to replace T3 during the defrost process, and then enters step S108 to determine again whether the unit exits the defrost process. When the unit does not exit the defrost process, it enters step S107 again. When the unit exits the defrost process, it enters step S101 and loops into the algorithm process.

[0082] In the calculation process of the above algorithm, the calculated value of the water temperature in the upper part of the water tank is rounded to the nearest integer.

[0083] The specific heat pump water heater control method provided by the embodiment of the present application, in a static heating heat pump water heater, uses the exhaust pressure to calculate the condensation temperature, and then uses the condensation temperature to indirectly calculate the upper temperature of the water tank, thereby replacing the middle and upper temperature sensing package of the water tank; under different ambient temperatures T1, the middle and upper temperature T3 of the water tank at different condensation temperatures T2 is T3 = a*T1*T2+b*T2+c*T1+d; during the defrosting process of the unit, stop calculating the middle and upper temperature T3 of the water tank, and use the calculated value T3* of the middle and upper temperature of the water tank 30s before defrosting instead. In the production design stage, it can reduce the assembly workload of the water tank temperature sensing package, reduce the production and product material costs, reduce production hours and improve production efficiency, and avoid various failure problems caused by the influence of the water tank temperature sensing package assembly in after-sales.

[0084] Based on the same inventive concept, Figure 3 As shown, the present application also provides a heat pump water heater control device 30, which is applied to a static heating heat pump water heater. The heat pump water heater control device 30 includes:

[0085] The parameter acquisition module 31 is used to obtain the outdoor ambient temperature and the condensing temperature when the heat pump water heater is running stably;

[0086] Preferably, if the difference between the target parameter at the current moment and the target parameter at the previous moment is less than a preset difference, it is determined that the heat pump water heater is operating stably;

[0087] If the difference between the target parameter at the current moment and the target parameter at the previous moment is greater than or equal to the preset difference, it is determined that the heat pump water heater is operating unstably;

[0088] The target parameter includes any one of the following:

[0089] Exhaust pressure, condensing temperature, high pressure, exhaust temperature.

[0090] Additionally, it includes:

[0091] Obtaining the exhaust pressure of the heat pump water heater;

[0092] The condensing temperature is determined based on the exhaust pressure.

[0093] A water temperature determination module 32, for determining a theoretical water temperature at an upper portion of a water tank of the heat pump water heater according to the outdoor ambient temperature and the condensation temperature based on an operation mode of the heat pump water heater;

[0094] In some embodiments, the determining of the theoretical water temperature at the upper portion of the water tank of the heat pump water heater based on the operating mode of the heat pump water heater and according to the outdoor ambient temperature and the condensing temperature includes:

[0095] When the heat pump water heater is not in defrosting mode, obtaining a first water temperature based on the outdoor ambient temperature at a current moment and the condensing temperature at a current moment;

[0096] The first water temperature is used as the theoretical water temperature of the upper part of the water tank of the heat pump water heater.

[0097] Wherein, obtaining the first water temperature based on the outdoor ambient temperature at the current moment and the condensation temperature at the current moment includes:

[0098] The first water temperature is obtained by using a pre-fitted formula, the outdoor ambient temperature at the current moment and the condensation temperature at the current moment.

[0099] Preferably, the formula is as follows:

[0100] The first water temperature=the first fitting coefficient*the outdoor ambient temperature at the current moment*the condensation temperature at the current moment+the second fitting coefficient*the outdoor ambient temperature at the current moment+the third fitting coefficient*the condensation temperature at the current moment+the fourth fitting coefficient.

[0101] In some other embodiments, the determining of the theoretical water temperature at the upper portion of the water tank of the heat pump water heater based on the operating mode of the heat pump water heater and according to the outdoor ambient temperature and the condensing temperature includes:

[0102] When the heat pump water heater is in defrost mode, the outdoor environment temperature at a historical moment and the condensation temperature at a historical moment are obtained to obtain a second water temperature, wherein the historical moment is a moment of a preset time before entering the defrost mode;

[0103] The second water temperature is used as the theoretical water temperature of the upper part of the water tank of the heat pump water heater.

[0104] The water heater control module 33 is used to control the heat pump water heater based on the theoretical water temperature.

[0105] The heat pump water heater control device provided in the embodiment of the present application obtains the outdoor ambient temperature and the condensing temperature when the heat pump water heater is running stably; then, based on the operation mode of the heat pump water heater, the theoretical water temperature of the upper part of the water tank of the heat pump water heater is determined according to the outdoor ambient temperature and the condensing temperature, and finally the heat pump water heater is controlled based on the theoretical water temperature. In the present application scheme, the heat pump water heater does not need to be provided with a sensor on the upper part of the water tank, and only needs to obtain it according to the outdoor ambient temperature and the condensing temperature. In the production design stage, it can reduce the assembly workload of the water tank temperature sensing package, reduce the production and product material costs, reduce the production hours and improve the production efficiency, and avoid various failure problems caused by the influence of the water tank temperature sensing package components in after-sales.

[0106] Based on the same inventive concept, Figure 4As shown, the present application also provides a heat pump water heater control system 40, including:

[0107] at least one processor 41 and at least one memory 42;

[0108] The memory stores executable instructions of the processor;

[0109] The processor is configured to execute the heat pump water heater control method provided in the above embodiment.

[0110] The heat pump water heater control system provided by the embodiment of the present application stores the executable instructions of the processor in the memory. When the executable instructions are executed, the processor can obtain the outdoor ambient temperature and the condensing temperature when the heat pump water heater is running stably; then, based on the operation mode of the heat pump water heater, the theoretical water temperature of the upper part of the water tank of the heat pump water heater is determined according to the outdoor ambient temperature and the condensing temperature, and finally the heat pump water heater is controlled based on the theoretical water temperature. In the present application scheme, the heat pump water heater does not need to set a sensor on the upper part of the water tank, but only needs to obtain it according to the outdoor ambient temperature and the condensing temperature. In the production design stage, it can reduce the assembly workload of the water tank temperature sensing package, reduce the production and product material costs, reduce the production hours and improve the production efficiency. In after-sales, it can avoid various failure problems caused by the influence of the water tank temperature sensing package assembly.

[0111] Based on the same inventive concept, the present application also provides a water heater, which uses the heat pump water heater control method provided in the above embodiment.

[0112] The water heater provided in the embodiment of the present application can obtain the outdoor ambient temperature and the condensing temperature when the heat pump water heater is running stably by applying the heat pump water heater control method provided in the above embodiment; then, based on the operation mode of the heat pump water heater, the theoretical water temperature of the upper part of the water tank of the heat pump water heater is determined according to the outdoor ambient temperature and the condensing temperature, and finally the heat pump water heater is controlled based on the theoretical water temperature. In the scheme of the present application, the heat pump water heater does not need to be provided with a sensor on the upper part of the water tank, but only needs to be obtained according to the outdoor ambient temperature and the condensing temperature. In the production design stage, the assembly workload of the water tank temperature sensing package can be reduced, the production and product material costs can be reduced, the production hours can be reduced, and the production efficiency can be improved. In after-sales service, various fault problems caused by the influence of the water tank temperature sensing package assembly can be avoided.

[0113] It should be noted that, in the description of this application, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of this application, unless otherwise specified, the meaning of "plurality" refers to at least two.

[0114] It can be understood that the same or similar parts of the above embodiments can be referenced to each other, and the contents not described in detail in some embodiments can refer to the same or similar contents in other embodiments.

Claims

1. A heat pump water heater control method, characterized in that: Applied to a static heating heat pump water heater, the method comprises: When the heat pump water heater is running stably, obtain the outdoor ambient temperature and condensing temperature; Based on the operation mode of the heat pump water heater, determining the theoretical water temperature of the upper part of the water tank of the heat pump water heater according to the outdoor ambient temperature and the condensing temperature; The heat pump water heater is controlled based on the theoretical water temperature.

2. The method according to claim 1, characterized in that: The method of determining the theoretical water temperature at the upper portion of the water tank of the heat pump water heater based on the operation mode of the heat pump water heater and according to the outdoor ambient temperature and the condensation temperature comprises: When the heat pump water heater is not in defrosting mode, obtaining a first water temperature based on the outdoor ambient temperature at a current moment and the condensing temperature at a current moment; The first water temperature is used as the theoretical water temperature of the upper part of the water tank of the heat pump water heater.

3. The method according to claim 2, characterized in that: The obtaining of the first water temperature based on the outdoor ambient temperature at the current moment and the condensation temperature at the current moment includes: The first water temperature is obtained by using a pre-fitted formula, the outdoor ambient temperature at the current moment and the condensation temperature at the current moment.

4. The method according to claim 3, characterized in that: The formula is as follows: The first water temperature=the first fitting coefficient*the outdoor ambient temperature at the current moment*the condensation temperature at the current moment+the second fitting coefficient*the outdoor ambient temperature at the current moment+the third fitting coefficient*the condensation temperature at the current moment+the fourth fitting coefficient.

5. The method according to claim 1, characterized in that: The method of determining the theoretical water temperature at the upper portion of the water tank of the heat pump water heater based on the operation mode of the heat pump water heater and according to the outdoor ambient temperature and the condensation temperature comprises: When the heat pump water heater is in defrost mode, the outdoor environment temperature at a historical moment and the condensation temperature at a historical moment are obtained to obtain a second water temperature, wherein the historical moment is a moment of a preset time before entering the defrost mode; The second water temperature is used as the theoretical water temperature of the upper part of the water tank of the heat pump water heater.

6. The method according to claim 1, characterized in that Also includes: If the difference between the target parameter at the current moment and the target parameter at the previous moment is less than the preset difference, it is determined that the heat pump water heater is operating stably; If the difference between the target parameter at the current moment and the target parameter at the previous moment is greater than or equal to the preset difference, it is determined that the heat pump water heater is operating unstably; The target parameter includes any one of the following: Exhaust pressure, condensing temperature, high pressure, exhaust temperature.

7. The method according to claim 1, characterized in that Also includes: Obtaining the exhaust pressure of the heat pump water heater; The condensing temperature is determined based on the exhaust pressure.

8. A heat pump water heater control device, characterized in that: Applied to a static heating heat pump water heater, the device comprises: A parameter acquisition module, used to obtain the outdoor ambient temperature and condensing temperature when the heat pump water heater is running stably; A water temperature determination module, for determining a theoretical water temperature at an upper portion of a water tank of the heat pump water heater according to an operation mode of the heat pump water heater, the outdoor ambient temperature and a condensing temperature; The water heater control module is used to control the heat pump water heater based on the theoretical water temperature.

9. A heat pump water heater control system, characterized in that: include: at least one processor and at least one memory; The memory stores executable instructions of the processor; The processor is configured to execute the method according to any one of claims 1 to 7.

10. A water heater, characterized in that: The method according to any one of claims 1 to 7 is used.

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