Control method, device and equipment for heat pump water heating equipment and storage medium

Abstract

The invention belongs to the technical field of electric appliances, and particularly relates to a control method, device and equipment of heat pump water heating equipment and a storage medium, and the control method comprises the steps that a plurality of control schemes used for controlling the operation frequency of a compressor are obtained according to the initial water temperature in a water tank, the actual environment temperature and the preset target heating temperature, each control scheme is composed of theoretical heating duration, theoretical power consumption and a plurality of target frequency values corresponding to different water temperatures in the water tank; the control scheme with the theoretical heating duration smaller than or equal to the preset duration and the minimum theoretical power consumption serves as a target control scheme; and the compressor is controlled to operate according to the target control scheme, the heating time can be controlled according to the requirements of the user, the energy-saving effect of the heat pump hot water equipment can be effectively improved, and therefore the user experience is effectively improved.

Description

Technical Field

[0001] This application belongs to the technical field of electrical appliances, and particularly relates to a control method, device, equipment and storage medium for a heat pump water heater device. Background Art

[0002] A heat pump water heater device utilizes a refrigerant to absorb low-grade heat energy in the environment, and transfers this part of the heat energy to the water in the water tank through a heat exchanger in the heat pump cycle to produce hot water. Compared with an electric water heater and a gas water heater, it can effectively reduce energy consumption and is favored by more and more families.

[0003] A heat pump water heater device generally includes a heat exchanger, a water tank and a heat pump main unit. The heat pump main unit is connected to the water tank through the heat exchanger. The refrigerant flows in the heat exchanger and exchanges heat with the water in the water tank to produce hot water.

[0004] Currently, the operating frequency of the compressor of a heat pump water heater device is generally a fixed value preset in advance. However, the ambient temperature where the heat pump water heater device is located, the inlet water temperature in the water tank, and the target heating temperature set by the user will change. Operating at the preset operating frequency all the time not only cannot effectively reduce energy consumption, but also cannot enable the user to control the heating time of the heat pump water heater device according to the water usage demand, affecting the user experience. Summary of the Invention

[0005] This application provides a control method, device, equipment and storage medium for a heat pump water heater device to solve the problem that the existing heat pump water heater device can neither effectively reduce energy consumption nor control the heating time according to the user's water usage demand, affecting the user experience.

[0006] The first aspect of this application provides a control method for a heat pump water heater device, including: obtaining a plurality of control schemes for controlling the operating frequency of the compressor according to the initial water temperature in the water tank, the actual ambient temperature and the preset target heating temperature, where each of the control schemes consists of a theoretical heating duration, a theoretical power consumption and a plurality of target frequency values corresponding to different water temperatures in the water tank;

[0007] Taking the control scheme with the theoretical heating duration less than or equal to the preset duration and the minimum theoretical power consumption as the target control scheme;

[0008] Controlling the compressor to operate according to the target control scheme.

[0009] In a possible design, the obtaining a plurality of control schemes for controlling the compressor frequency according to the initial water temperature, the actual ambient temperature and the preset target heating temperature includes:

[0010] Matching a corresponding target water temperature range from a plurality of preset continuous water temperature ranges according to the initial water temperature and the target heating temperature;

[0011] According to the actual ambient temperature, match a target first correspondence and a target second correspondence from a plurality of preset first correspondences between the frequency values and heating durations of each of the target water temperature ranges and a plurality of second correspondences between the frequency values and power consumption of the compressors;

[0012] According to the target first correspondence and the target second correspondence, obtain an intermediate heating duration and intermediate power consumption corresponding to each of the target frequency values;

[0013] Obtain a plurality of the control schemes. Each of the target water temperature ranges provides a target frequency value for the control scheme. Stack the intermediate heating durations corresponding to each of the target frequency values in the control scheme as the theoretical heating duration, and stack the intermediate power consumptions corresponding to each of the target frequency values in the control scheme as the theoretical power consumption.

[0014] In a possible design, before obtaining the plurality of control schemes, it further includes:

[0015] If the initial water temperature or the target heating temperature is a non-boundary value in the target water temperature range, determine an actual heating temperature range corresponding to the target water temperature range according to the non-boundary value;

[0016] Use the proportion of the actual heating temperature range in the target water temperature range as a proportionality coefficient;

[0017] Update the intermediate heating duration corresponding to the target water temperature range according to the product of the intermediate heating duration and the proportionality coefficient;

[0018] Update the intermediate power consumption corresponding to the target water temperature range according to the product of the intermediate power consumption and the proportionality coefficient.

[0019] In a possible design, before matching the target first correspondence and the target second correspondence, it further includes:

[0020] Match a target ambient temperature range from a plurality of preset consecutive ambient temperature ranges according to the actual ambient temperature;

[0021] Match the target first correspondence and the target second correspondence according to the target ambient temperature range.

[0022] In a possible design, the establishment of the first correspondence and the second correspondence includes:

[0023] In each of the ambient temperature ranges, the compressor is operated at the test frequency value, and the water temperature is heated from the lower limit temperature of each water temperature range to the upper limit temperature of the water temperature range, to obtain the test operation duration and the test power consumption, where each water temperature range corresponds to a plurality of the test frequency values;

[0024] Based on the test frequency value, the corresponding test operation duration, and the test power consumption, the first corresponding relationship and the second corresponding relationship corresponding to each water temperature range within the ambient temperature range are obtained.

[0025] In one possible design, after obtaining a plurality of the control schemes, it further includes: calculating the preset duration according to the specified heating capacity.

[0026] In one possible design, before calculating the preset duration according to the specified heating capacity, it further includes: calculating the specified heating capacity according to a preset heating duration limit.

[0027] In one possible design, the calculation equation of the preset duration is:

[0028]

[0029] where C p is the specific heat of water at the average inlet and outlet water temperature; V is the water tank capacity of the heat pump water heating device; T2 is the outlet water temperature of the water tank; T1 is the inlet water temperature of the water tank; Q is the specified heating capacity; Q 余量 % is the preset heating capacity margin.

[0030] In one possible design, controlling the compressor to operate according to the target control scheme includes:

[0031] During the operation of the compressor, obtaining the real-time water temperature in the water tank;

[0032] Determining the target frequency value corresponding to the real-time water temperature in the target control scheme;

[0033] Controlling the compressor to operate according to the target frequency value.

[0034] The second aspect of the present application provides a heat pump water heating device, including:

[0035] An acquisition module, configured to acquire the initial water temperature of the water tank and the actual ambient temperature;

[0036] A determination module, configured to obtain a plurality of control schemes for controlling the operation frequency of the compressor according to the initial water temperature, the actual ambient temperature, and a preset target heating temperature; and using the control scheme with a theoretical heating duration less than or equal to the preset duration and the minimum theoretical power consumption as the target control scheme;

[0037] A control module for controlling the operation of the compressor according to the target control scheme.

[0038] A third aspect of the present application provides a heat pump water heater, including a compressor and a water tank, further including a water tank temperature sensor, an ambient temperature sensor, a processor, and a memory;

[0039] Wherein, the processor, the memory, the ambient temperature sensor, and the water tank temperature sensor are interconnected by a circuit;

[0040] The water tank temperature sensor is used to obtain the initial water temperature in the water tank;

[0041] The ambient temperature sensor is used to obtain the actual ambient temperature;

[0042] The memory stores computer-executable instructions;

[0043] The processor executes the computer-executable instructions stored in the memory to implement the control method of the heat pump water heater as described in the first aspect.

[0044] A fourth aspect of the present application provides a computer-readable storage medium, in which computer-executable instructions are stored, and when the computer-executable instructions are executed, they are used to implement the control method of the heat pump water heater as described in the first aspect.

[0045] The control method, device, equipment, and storage medium of the heat pump water heater provided by the present application, during the operation of the heat pump water heater, obtain multiple control schemes for controlling the operating frequency of the compressor through the initial water temperature in the water tank, the actual ambient temperature, and the preset target heating temperature, and use the control scheme with a theoretical heating duration less than or equal to the preset duration and the minimum theoretical power consumption as the target control scheme to control the operation of the compressor, so that the heat pump water heater can heat the water in the water tank from the initial water temperature to the target heating temperature within the preset duration, thereby making the waiting time for the user to use hot water controllable, better meeting the user's water use requirements, and while meeting the user's water use time requirements, being able to select the control scheme with the lowest power consumption to effectively reduce energy consumption and achieve a better energy-saving effect, jointly improving the user experience from two aspects. Description of the Drawings

[0046] The drawings here are incorporated into the specification and form a part of this specification, showing the embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application.

[0047] Figure 1 Schematic flow of the control method of the heat pump water heater provided by the embodiments of the present application Figure 1 ;

[0048] Figure 2 A flowchart showing a method for obtaining a control solution provided by an embodiment of the present application;

[0049] Figure 3 A flowchart showing a method for establishing a first correspondence and a second correspondence provided by an embodiment of the present application;

[0050] Figure 4 A flowchart showing a control method for a heat pump water heater provided by an embodiment of the present application Figure 2 ;

[0051] Figure 5 A schematic structural diagram of a heat pump water heater provided by an embodiment of the present application.

[0052] Through the above-mentioned drawings, specific embodiments of the present application have been shown, and more detailed descriptions will be given later. These drawings and textual descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. Detailed Embodiments

[0053] To make the objectives, technical solutions, and advantages of the present application clearer, the technical solutions in the present application will be clearly and completely described below with reference to the drawings in the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the protection scope of the present application.

[0054] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and do not necessarily need to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments of the present invention described herein can be implemented in an order different from those illustrated or described herein, for example.

[0055] In the embodiments of the present application, words such as "exemplary" or "for example" are used to represent examples, illustrations, or explanations. Any embodiment or design solution described as "exemplary" or "for example" in the present application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Rather, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific manner.

[0056] Coefficient of performance: It refers to the ratio of the energy consumption to the utility of a heat pump water heater, that is, the ratio of the heat output of the heat pump water heater to the power consumption for heating of the heat pump water heater.

[0057] Heating capacity: It refers to the heat provided to the water to be heated per unit time when the heat pump water heater operates under the nominal working conditions and specified conditions.

[0058] At present, the operating frequency of the compressor of the heat pump water heater is generally a preset fixed value. However, the ambient temperature of the heat pump water heater and the target heating temperature set by the user and other conditions will change. If it always operates at the preset operating frequency, the following problems are likely to occur:

[0059] 1. The heating duration for heating the water to the target heating temperature cannot be controlled. If the user urgently needs water, there may be a situation where there is no hot water available in a short time, and it cannot flexibly adapt to the user's water usage requirements;

[0060] 2. If the user is not in a hurry to use water and the compressor also operates at a high frequency, it will cause waste of energy and it is difficult to improve the energy-saving effect of the heat pump water heater.

[0061] In order to avoid the above problems, from the perspective of meeting the user's usage requirements, on the one hand, the heating duration of the heat pump water heater can be adjusted according to the user's needs, and on the other hand, while meeting the user's requirements for heating time, the energy consumption can be minimized as much as possible to improve the energy-saving effect of the heat pump water heater, so that the operation of the heat pump water heater is more in line with the user's needs and the user experience is greatly improved.

[0062] The following uses specific embodiments to elaborate in detail on the technical solution of this application and how the technical solution of this application solves the above technical problems. These specific embodiments below can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of this application will be described below in conjunction with the accompanying drawings.

[0063] Please refer to Figure 1 As shown, this embodiment provides a control method for a heat pump water heater, which is mainly used for heat pump water heaters with a water storage function, such as heat pump water heaters, heat pump heaters, etc. Among them, the heat pump water heater to which the control method of this embodiment is applicable generally includes components such as a compressor, an evaporator, a heat exchanger, and a container for storing hot water. For the convenience of understanding, the container for storing hot water in the heat pump water heater in this embodiment is named a water tank. When the heat pump water heater operates, the refrigerant circulates between the compressor, the evaporator, and the heat exchanger, and after the refrigerant reaches the heat exchanger, it will exchange heat with the water in the water tank to heat the water. Among them, the control method includes:

[0064] S101. Obtain multiple control schemes for controlling the operating frequency of the compressor according to the initial water temperature, the actual ambient temperature, and the preset target heating temperature;

[0065] Specifically, the initial water temperature of the water tank can be obtained at least in the following ways:

[0066] First, install a temperature sensor on the water inlet side of the water tank, and use the water temperature detected by the water inlet side temperature sensor as the initial water temperature of the water tank.

[0067] Second, install a temperature sensor at each of the water inlet and outlet of the water tank, and use the average value of the water temperatures detected by the two sensors as the initial water temperature of the water tank.

[0068] Of course, the ambient temperature can directly connect to the network to obtain the local ambient temperature, or a dedicated temperature sensor can be installed to detect the ambient temperature corresponding to the location where the heat pump water heater is located.

[0069] Among them, each control scheme includes the theoretical heating duration and the theoretical power consumption, as well as multiple target frequency values corresponding to different water temperatures of the water tank. That is, each control scheme consists of multiple target frequency values, and different target frequency values are switched accordingly according to the change of the water temperature in the water tank. The theoretical heating duration is the total duration finally required for the compressor to heat the water in the water tank from the initial water temperature to the target heating temperature according to this control scheme, and the theoretical power consumption is the total power consumption finally required for the compressor to heat the water in the water tank from the initial water temperature to the target heating temperature according to this control scheme.

[0070] S102. Use the control scheme with a theoretical heating duration less than or equal to the preset duration and the minimum theoretical power consumption as the target control scheme;

[0071] Specifically, the preset duration represents the longest time that can be spent to heat the water in the water tank from the initial water temperature to the target heating temperature this time. By screening the control scheme with the preset duration, it can be ensured that the obtained target control scheme meets the user's demand for the usage time.

[0072] The power consumption and the energy efficiency ratio are negatively correlated. The higher the power consumption, the lower the energy efficiency ratio. Selecting the control scheme with the minimum power consumption as the target control scheme can maximize the energy efficiency ratio of the heat pump water heater.

[0073] S103. Control the compressor to operate according to the target control scheme.

[0074] Specifically, taking the heating time as one of the screening conditions of the control scheme, when the compressor heats according to the control scheme that meets the conditions, the water can be heated to the target heating temperature within the preset duration to match the user's demand for hot water and improve the user experience.

[0075] And using the control scheme with the minimum theoretical power consumption as the target control scheme can select the control scheme with the highest energy efficiency ratio from the control schemes that meet the previous condition, so that the compressor can operate according to the most energy-saving frequency value.

[0076] In this embodiment, first, multiple control schemes for controlling the operating frequency of the compressor are generated based on the initial water temperature of the water tank, the actual ambient temperature, and the preset target heating temperature. Then, all the schemes that meet the preset duration requirement are selected from the control schemes. When the compressor operates according to the selected control scheme, it can heat the water in the water tank from the initial water temperature to the target heating temperature within the time limited by the preset duration, so as to ensure the normal water use of users. On this basis, the control scheme with the smallest power consumption is selected as the target control scheme. When the compressor operates according to the target control scheme, the energy efficiency is the highest, thereby effectively reducing the energy consumption of the heat pump water heater and improving the user experience in multiple aspects.

[0077] Among them, generating multiple control schemes for controlling the compressor frequency based on the initial water temperature, the actual ambient temperature, and the preset target heating temperature can be completed at least in the following two ways:

[0078] First, the heating water temperature range of the heat pump water heater is divided into multiple water temperature segments in advance, and different ambient temperatures are corresponding to each water temperature segment. Multiple target frequency values, as well as the power consumption and heating duration corresponding to the target frequency values, are preset. Here, the power consumption refers to the power consumption when the compressor operates according to the target frequency value and heats the water in the water tank from the lower limit temperature of the water temperature segment to the upper limit temperature. Here, the heating duration refers to the operating duration when the compressor operates according to the target frequency value and heats the water in the water tank from the lower limit temperature of the water temperature segment to the upper limit temperature.

[0079] After obtaining the initial water temperature and the target heating temperature, the current water temperature range to be heated can be matched with the preset water temperature segments to determine the corresponding water temperature segment. Then, the target frequency values that meet the requirements are selected according to the actual ambient temperature, and a frequency combination is formed by randomly selecting a target frequency value from each water temperature segment. The corresponding theoretical power consumption and theoretical heating duration are calculated to form a control scheme. By traversing all the target frequency values that meet the requirements, multiple control schemes can be generated.

[0080] Second, please refer to Figure 2 As shown, the following steps are included:

[0081] S201. For the heating water temperature range of the heat pump water heater, multiple continuous water temperature intervals are preset;

[0082] Specifically, the heating water temperature range of the heat pump water heater is the water temperature range composed of the lower limit temperature of the water tank inlet and the upper limit temperature of the water tank outlet. When dividing the water temperature intervals, they can be divided according to any temperature interval.

[0083] Exemplarily, the water temperature range is divided at the same water temperature interval. Specifically, the heating water temperature range is evenly divided into multiple water temperature intervals with the same difference between the upper limit temperature and the lower limit temperature. Of course, at this time, the water temperature interval should not be too large to better match the operating frequency of the compressor and reduce energy consumption.

[0084] Exemplarily, the water temperature range is divided at multiple different water temperature intervals. Specifically, among all the water temperature intervals, there are at least two water temperature intervals with different differences between the upper limit temperature and the lower limit temperature. Of course, at this time, the differences between the upper and lower temperatures and the lower limit temperature of different water temperature intervals can be determined according to the heating characteristics of the current water temperature interval to better match the operating frequency of the compressor and reduce energy consumption.

[0085] S202. Corresponding to the ambient temperature and the water temperature interval, preset the first correspondence between the frequency value of the compressor and the heating duration, and the second correspondence between the frequency value of the compressor and the power consumption;

[0086] Specifically, corresponding to different ambient temperatures, preset the corresponding first correspondence and second correspondence for each water temperature interval, that is, in each water temperature interval, there are multiple first correspondences and second correspondences corresponding to different ambient temperatures.

[0087] Among them, the heating duration in the first correspondence represents the time required to heat the water in the water tank from the lower limit temperature of a water temperature interval to the upper limit temperature when the compressor operates at the corresponding frequency value, and the power consumption in the second correspondence represents the power required to heat the water in the water tank from the lower limit temperature of a water temperature interval to the upper limit temperature.

[0088] The ambient temperature here can include all ambient temperatures at which the heat pump water heater is allowed to operate.

[0089] Of course, the ambient temperature here can also refer to the ambient temperature range. Specifically, the entire ambient temperature range at which all heat pump water heaters are allowed to operate can be divided into multiple continuous ambient temperature ranges, and each ambient temperature range is the ambient temperature mentioned here.

[0090] When the difference in ambient temperature is small, its impact on the energy efficiency ratio of the heat pump water heater is small. Therefore, multiple ambient temperature ranges can be preset, and for each ambient temperature range, determine the corresponding first correspondence and second correspondence for each water temperature interval to reduce the data processing volume and improve the response speed.

[0091] S203. Match the initial water temperature and the target heating temperature in multiple water temperature intervals to obtain the target water temperature interval;

[0092] S204. Determine the target first correspondence and the target second correspondence corresponding to each target water temperature range according to the actual ambient temperature;

[0093] S205. Determine the intermediate heating duration and the intermediate power consumption corresponding to all the target frequency values within each target water temperature range;

[0094] Specifically, each water temperature range has multiple target frequency values. As long as the target frequency values are substituted into the corresponding first correspondence, the corresponding intermediate heating duration can be obtained. Substituting the target frequency values into the corresponding second correspondence, the corresponding intermediate power consumption can be obtained.

[0095] Among them, the target frequency values can be determined at least in the following ways:

[0096] First, all the frequency values within the operating range of the compressor are used as the target frequency values for each water temperature range.

[0097] Second, some common frequency values of the compressor are selected as the target frequency values.

[0098] Third, all the frequency values within the common frequency range of the compressor are used as the target frequency values.

[0099] S206. Obtain multiple control schemes according to the target water temperature range.

[0100] Specifically, the water temperature range between the initial water temperature and the target heating temperature is divided into multiple target water temperature ranges. As long as one target frequency value is selected from each target water temperature range to form a frequency combination, the compressor frequency control strategy for heating the water in the water tank from the initial water temperature to the target heating temperature can be determined. On the basis of the frequency combination, the intermediate heating durations corresponding to each target frequency value in the frequency combination are accumulated to obtain the theoretical heating duration, and all the intermediate power consumptions are accumulated to obtain the theoretical power consumption, then a control scheme can be obtained. As long as all the target frequency values of each target water temperature range are traversed, multiple control schemes can be obtained.

[0101] Such a setting method can reduce the difficulty of obtaining the intermediate power consumption and the intermediate heating duration corresponding to the target frequency values, and can generate more control schemes, enabling a better selection of the appropriate target control scheme and improving the energy-saving effect.

[0102] In some possible implementation manners, shielding frequencies can also be preset for some special water temperature ranges. When determining the target frequency values corresponding to each water temperature range, the corresponding shielding frequencies can be directly avoided.

[0103] Specifically, for some special temperatures, there are some frequency values that cannot be used by the compressor, otherwise it will cause frequency resonance, increase the operating noise, or exceed the high-pressure limit, affecting the service life of the compressor.

[0104] In this embodiment, for the water temperature ranges with these special temperatures, the relevant frequency values are set as blocked frequencies, which can avoid the above problems, improve the service life of the compressor, reduce the operating noise of the compressor, and thus effectively improve the user experience.

[0105] Please refer to Figure 3 As shown, the establishment of the first correspondence and the second correspondence includes the following steps:

[0106] S301. Divide the allowable operating ambient temperature range of the heat pump water heater into multiple continuous ambient temperature ranges;

[0107] Divide the heating water temperature range formed by the lowest allowable water tank inlet temperature and the highest allowable water outlet temperature of the heat pump water heater into multiple continuous water temperature ranges;

[0108] Set multiple test frequency values within the operable frequency range of the compressor;

[0109] S302. For each ambient temperature range, make the compressor operate according to the test frequency value, heat the water temperature from the lower limit temperature to the upper limit temperature of each water temperature range, and obtain the test operation duration and test power consumption;

[0110] Specifically, under the same test conditions, and keeping the ambient temperature during the test within the same ambient temperature range, make the compressor operate according to the test frequency value within each water temperature range, and measure the test power consumption and test operation duration corresponding to all test frequency values in each water temperature range.

[0111] S303. Fit the first correspondence and the second correspondence corresponding to each water temperature range within each ambient temperature range through the test frequency value, test operation duration, and test power consumption.

[0112] Specifically, the methods for fitting the first correspondence and the second correspondence corresponding to each water temperature range within each ambient temperature range through the test frequency value, test operation duration, and test power consumption include at least the following:

[0113] First, fit the test frequency value and test operation duration through polynomial interpolation to obtain an equation representing the relationship between the frequency value and the heating duration as the first correspondence. Fit the test frequency value and test power consumption through polynomial interpolation to obtain an equation representing the relationship between the frequency value and the power consumption as the second correspondence.

[0114] Exemplarily, the first correspondence is: H = ax2 + bx + c;

[0115] The second corresponding relationship is: E = a`x 2 + b`x + c`;

[0116] Wherein, x represents the frequency value of the compressor operation, H represents the heating duration, and E represents the power consumption.

[0117] Of course, the above two equations are only examples. When actually fitting, the number of iterations can be determined according to the fitting situation.

[0118] Second, use the test frequency value and the test operation duration as samples to train a random forest model to obtain the first corresponding relationship for predicting the heating duration based on the frequency value, and use the test frequency value and the test power consumption as samples to train a random forest model to obtain the second corresponding relationship for predicting the power consumption based on the frequency value.

[0119] Third, use the test frequency value, the test operation duration, and the test power consumption as samples to train a neural network model to obtain the first corresponding relationship between the frequency value and the heating duration and the second corresponding relationship between the frequency value and the power consumption.

[0120] Of course, other algorithm models can also be used to predict the heating duration and the power consumption through the frequency value. The above several are only examples for illustration and are not limitations on determining the first corresponding relationship and the second corresponding relationship.

[0121] During the operation of the heat pump water heater, sometimes it may occur that the initial water temperature and the target heating temperature are not the boundary values of their corresponding target water temperature ranges. At this time, the intermediate power consumption and the intermediate heating duration corresponding to the target water temperature range can be corrected to make the intermediate power consumption and the intermediate heating duration corresponding to the target frequency value more matched with the actual situation.

[0122] That is, the corrected power consumption and the corrected heating duration corrected according to the initial water temperature and the target heating temperature can be used to replace the original intermediate power consumption and the original intermediate heating duration.

[0123] The specific correction method is as follows:

[0124] Judge whether the initial water temperature and the target heating temperature are non-boundary values of their corresponding target water temperature ranges;

[0125] If not, directly generate a control scheme according to the original intermediate heating duration and the original intermediate power consumption corresponding to the target water temperature range.

[0126] If so, for the initial water temperature, the water temperature range between the initial water temperature and the upper limit temperature of the target water temperature range is used as the actual heating temperature range; for the target heating temperature, the water temperature range between the lower limit temperature of the target water temperature range and the target heating temperature is used as the actual heating temperature range.

[0127] Take the ratio of the actual heating temperature range within the corresponding target temperature range of the entire target water temperature range as the proportionality coefficient:

[0128] Proportionality coefficient = actual heating temperature range / target temperature range;

[0129] Record the original intermediate heating duration corresponding to the target frequency value in the target water temperature range as the first intermediate heating duration, and record the original corresponding intermediate power consumption in the target water temperature range as the first intermediate power consumption;

[0130] After correction, the obtained corrected heating duration is the product of the proportionality coefficient and the first intermediate heating duration, and the corrected power consumption is the product of the proportionality coefficient and the first intermediate power consumption.

[0131] Finally, update the first heating duration with the corrected heating duration, and update the first intermediate power consumption with the corrected power consumption.

[0132] After the intermediate heating duration and intermediate power consumption corresponding to the initial water temperature and the target heating water temperature in the target water temperature range are both corrected, generate a control scheme.

[0133] After obtaining the control scheme, the control scheme can be screened once through a preset duration. Among them, the preset duration includes at least the following two sources:

[0134] First, calculate the preset duration according to the specified heating capacity that meets the minimum heating capacity requirement of the heat pump water heater.

[0135] At this time, the preset duration can be calculated according to the specified heating capacity, where the specified heating capacity can be the nominal heating capacity of the heat pump water heater or the heating capacity set in advance according to the actual use environment.

[0136] During the actual use of the heat pump water heater, it is easy to cause some additional energy losses due to external environmental factors, resulting in the actual water temperature not reaching the target heating temperature after the theoretical heating duration of the heat pump water heater. In this regard, this embodiment adopts the following method to ensure that when the operation time of the heat pump water heater is within the user's expected time range, the water temperature in the water tank can reach the target heating temperature:

[0137]

[0138] Among them, C pc is the specific heat capacity of water at the average inlet and outlet temperature; V is the tank capacity of the heat pump water heater; T2 is the outlet temperature of the tank; T1 is the inlet temperature of the tank; Q is the specified heating capacity; Q 余量 % is the preset heating capacity margin.

[0139] The heating capacity margin is the additional heating capacity added in addition to the specified heating capacity to cope with the possible losses during the operation of the heat pump water heater through the heating capacity margin.

[0140] Of course, it can be understood that the heating capacity margin can be determined through multiple tests or directly preset according to experience.

[0141] Second, determine the preset duration according to the heating duration limit set by the user himself.

[0142] This method can better meet the actual usage needs of users.

[0143] Exemplarily, the user can input a heating duration limit by himself, calculate the specified heating capacity from the heating duration limit, and then calculate the preset duration. The specific calculation method is as follows:

[0144] The first step is to calculate the specified heating capacity:

[0145]

[0146] Where H here represents the heating duration limit input by the user.

[0147] The second step is to calculate the preset duration:

[0148]

[0149] Exemplarily, the preset duration can be multiple heating duration limits directly preset when the device leaves the factory. Each time the user uses it, he can directly select one heating duration limit from them as the preset duration.

[0150] On the basis of the above embodiments, controlling the compressor to operate according to the target control scheme may include at least the following two methods:

[0151] First, during the operation of the compressor, obtain the real-time water temperature in the tank and control the operation of the compressor according to the target frequency value corresponding to the real-time water temperature.

[0152] Second, in the control scheme, multiple target frequency values are arranged in the order of gradually increasing water temperature in the corresponding target water temperature range. During the operation of the compressor, record the operation duration of the compressor and match it with the theoretical heating duration of each water temperature range. After reaching the intermediate heating duration corresponding to the current target frequency value, control the compressor to jump to the next target frequency value for operation, and continuously cycle until the compressor traverses all target frequency values.

[0153] Please refer to Figure 4 As shown, this embodiment is combined on the basis of the above embodiment to further illustrate the control method of the heat pump water heater of the present application. The control method includes the following steps:

[0154] S401. Obtain the initial water temperature, actual ambient temperature, and target heating temperature in the water tank;

[0155] S402. Match the corresponding target water temperature range from a continuous plurality of water temperature ranges according to the initial water temperature and the target heating temperature;

[0156] S403. Match a target ambient temperature range from a plurality of continuous ambient temperature ranges according to the actual ambient temperature;

[0157] S404. Match the target first correspondence and target second correspondence corresponding to each target water temperature range according to the target ambient temperature range;

[0158] S405. Obtain multiple target frequency values corresponding to each target water temperature range, as well as the intermediate heating duration and intermediate power consumption corresponding to each target frequency value;

[0159] S405. Determine whether the initial water temperature and the heating water temperature are non-boundary values of the corresponding target water temperature range. If so, jump to step S406; if not, jump to step S407.

[0160] S406. Determine the proportionality coefficient, and update the intermediate heating duration of the target water temperature range corresponding to the non-boundary value by multiplying the intermediate heating duration by the proportionality coefficient, and update the intermediate power consumption of the target water temperature range corresponding to the non-boundary value by multiplying the intermediate power consumption by the proportionality coefficient;

[0161] S407. Obtain multiple control schemes, and determine the theoretical heating duration and theoretical power consumption corresponding to each control scheme;

[0162] S408. Use the control scheme with the theoretical heating duration less than or equal to the preset duration and the minimum theoretical power consumption as the target control scheme;

[0163] S409. Control the compressor to operate according to the target control scheme.

[0164] Of course, it can be understood that this embodiment is merely a combination for the convenience of understanding and is not a limitation on the possible technical solutions of this application.

[0165] Please refer to Figure 5 As shown, the embodiment of the present application further provides a control device 500 for a heat pump water heater, which includes an acquisition module 510, a determination module 520, and a control module 530.

[0166] Among them, the acquisition module 510 is used to acquire the initial water temperature of the water tank and the actual ambient temperature. The determination module 520 is used to obtain multiple control schemes for controlling the operating frequency of the compressor according to the initial water temperature, the actual ambient temperature, and a preset target heating temperature; and use the control scheme with a theoretical heating duration less than or equal to the preset duration and the minimum theoretical power consumption as the target control scheme. The control module 530 is used to control the compressor to operate according to the target control scheme.

[0167] In some possible implementation manners, the determination module 520 is further used to match a corresponding target water temperature range from a preset multiple continuous water temperature ranges according to the initial water temperature and the target heating temperature; and match a target first correspondence and a target second correspondence from a first correspondence between multiple frequency values of the compressor and the heating duration and a second correspondence between multiple frequency values of the compressor and the power consumption preset for each target water temperature range according to the actual ambient temperature. The determination module 520 is further used to obtain an intermediate heating duration and an intermediate power consumption corresponding to each target frequency value according to the target first correspondence and the target second correspondence. The determination module 520 is further used to obtain multiple control schemes. Each target water temperature range provides a target frequency value for the control scheme. The intermediate heating durations corresponding to each target frequency value in the control scheme are superimposed as the theoretical heating duration, and the intermediate power consumptions corresponding to each target frequency value in the control scheme are superimposed as the theoretical power consumption.

[0168] In some possible implementation manners, when the initial water temperature or the target heating temperature is a non-boundary value in the target water temperature range, the determination module 520 is further used to use the proportion of the temperature range from the non-boundary value to the upper limit temperature of the target water temperature range in the entire target water temperature range as a proportionality coefficient; and update the intermediate heating duration corresponding to the target water temperature range by multiplying the intermediate heating duration by the proportionality coefficient; update the intermediate power consumption corresponding to the target water temperature range by multiplying the intermediate power consumption by the proportionality coefficient.

[0169] In some possible implementation manners, the acquisition module 510 is further used to acquire a heating duration limit value, and the determination module 520 is further used to calculate a specified heat output according to the heating duration limit value and calculate a preset duration according to the specified heat output.

[0170] Of course, it can be understood that the control device of the heat pump water heater in this embodiment is used to implement the control method of the above heat pump water heater, and its specific control logic is the same as that in the above embodiment, which will not be elaborated here.

[0171] An embodiment of the present application further provides a heat pump water heater, which includes a compressor, a water tank, a water tank temperature sensor, an ambient temperature sensor, a processor, and a memory.

[0172] Of course, it also includes components such as an evaporator, a heat exchanger, and an expansion valve that are connected to the compressor through pipelines. During the operation of the compressor, the refrigerant circulates among the compressor, the evaporator, the heat exchanger, and the expansion valve, and when the refrigerant enters the heat exchanger, it can exchange heat with the water in the water tank to heat the water.

[0173] The processor, the memory, the ambient temperature sensor, and the water tank temperature sensor are interconnected through circuits. The water tank temperature sensor is used to obtain the water temperature in the water tank, the ambient temperature sensor is used to obtain the actual ambient temperature, the memory stores computer-executable instructions, and the processor executes the computer-executable instructions stored in the memory to implement the control method of the heat pump water heater in the above embodiment.

[0174] Among them, the memory is used to store computer-executable instructions, and the processor executes the computer-executable instructions stored in the memory to implement the optimization method of the compressor frequency in the above embodiment.

[0175] Among them, the memory may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk memory.

[0176] The processor may be a central processing unit (CPU for short), or an application specific integrated circuit (ASIC for short), or one or more integrated circuits configured to implement the embodiments of the present application.

[0177] An embodiment of the present application further provides a computer-readable storage medium, which may include various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disc. The computer-readable storage medium stores computer-executable instructions, and when the computer-executable instructions are executed by the processor, they are used to implement the control method of the heat pump water heater in the above embodiment.

[0178] So far, the technical solutions of the present application have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, those skilled in the art can easily understand that the protection scope of the present application is obviously not limited to these specific embodiments. The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of the present application.

Claims

1. A control method for a heat pump water heater, characterized in that, Including: Obtain multiple control schemes for controlling the operating frequency of the compressor according to the initial water temperature in the water tank, the actual ambient temperature, and a preset target heating temperature, where each of the control schemes consists of a theoretical heating duration, a theoretical power consumption, and multiple target frequency values corresponding to different water temperatures in the water tank; Take the control scheme with the theoretical heating duration less than or equal to a preset duration and the minimum theoretical power consumption as the target control scheme; Control the compressor to operate according to the target control scheme.

2. The control method for a heat pump water heater according to claim 1, characterized in that, The obtaining of multiple control schemes for controlling the compressor frequency according to the initial water temperature, the actual ambient temperature, and the preset target heating temperature includes: Match a corresponding target water temperature range from a preset multiple continuous water temperature ranges according to the initial water temperature and the target heating temperature; Match a target first correspondence and a target second correspondence from a first correspondence between multiple frequency values of the compressor and a heating duration and a second correspondence between multiple frequency values of the compressor and a power consumption preset for each of the target water temperature ranges according to the actual ambient temperature; Obtain an intermediate heating duration and an intermediate power consumption corresponding to each of the target frequency values according to the target first correspondence and the target second correspondence; Obtain multiple control schemes. Each of the target water temperature ranges provides a target frequency value for the control scheme. The intermediate heating durations corresponding to each of the target frequency values in the control scheme are superimposed as the theoretical heating duration, and the intermediate power consumptions corresponding to each of the target frequency values in the control scheme are superimposed as the theoretical power consumption.

3. The control method for a heat pump water heater according to claim 2, characterized in that, Before obtaining multiple control schemes, it further includes: If the initial water temperature or the target heating temperature is a non-boundary value in the target water temperature range, determine an actual heating temperature range corresponding to the target water temperature range according to the non-boundary value; Take the proportion of the actual heating temperature range in the target water temperature range as a proportionality coefficient; Update the intermediate heating duration corresponding to the target water temperature range according to the product of the intermediate heating duration and the proportionality coefficient; Update the intermediate power consumption corresponding to the target water temperature range according to the product of the intermediate power consumption and the proportionality coefficient.

4. The control method for a heat pump water heater according to claim 2, characterized in that, Before matching the target first correspondence and the target second correspondence, it further includes: Match a target ambient temperature range from a preset multiple continuous ambient temperature ranges according to the actual ambient temperature; Match the target first correspondence and the target second correspondence according to the target ambient temperature range.

5. The control method for a heat pump water heater according to claim 4, characterized in that, The establishment of the first correspondence and the second correspondence includes: In each of the ambient temperature ranges, make the compressor operate according to a test frequency value, heat the water temperature from the lower limit temperature of each of the water temperature ranges to the upper limit temperature of the water temperature range, and obtain a test operation duration and a test power consumption, where each of the water temperature ranges corresponds to multiple test frequency values; Based on the test frequency value, the corresponding test running duration, and the test power consumption, the first corresponding relationship and the second corresponding relationship corresponding to each water temperature range within the ambient temperature range are obtained.

6. The control method for a heat pump water heater according to any one of claims 1-5, characterized in that, After obtaining multiple control schemes, it further includes: Calculating the preset duration according to the specified heating capacity.

7. The control method for a heat pump water heater according to claim 6, characterized in that, Before calculating the preset duration according to the specified heating capacity, it further includes: Calculating the specified heating capacity according to the preset heating duration limit.

8. The control method for a heat pump water heater according to claim 6, characterized in that, The calculation equation for the preset duration is: where C p is the specific heat of water at the average inlet and outlet temperatures; V is the water tank capacity of the heat pump water heater; T2 is the outlet water temperature of the water tank; T1 is the inlet water temperature of the water tank; Q is the specified heating capacity; Q margin% is the preset heating capacity margin.

9. The control method of a heat pump water heater according to any one of claims 1 - 5, characterized in that, Controlling the compressor to operate according to the target control scheme includes: During the operation of the compressor, obtaining the real-time water temperature in the water tank; Determining the target frequency value corresponding to the real-time water temperature in the target control scheme; Controlling the compressor to operate according to the target frequency value.

10. A control device of a heat pump water heater, characterized in that, It includes: An acquisition module for acquiring the initial water temperature and the actual ambient temperature in the water tank; A determination module for obtaining multiple control schemes for controlling the operating frequency of the compressor according to the initial water temperature, the actual ambient temperature, and the preset target heating temperature; Taking the control scheme with a theoretical heating duration less than or equal to the preset duration and the minimum theoretical power consumption as the target control scheme; A control module for controlling the compressor to operate according to the target control scheme.

11. A heat pump water heater, comprising a compressor and a water tank, characterized in that, It further includes a water tank temperature sensor, an ambient temperature sensor, a processor, and a memory; Among them, the processor, the memory, the ambient temperature sensor, and the water tank temperature sensor are interconnected through circuits; The water tank temperature sensor is used to acquire the initial water temperature in the water tank; The ambient temperature sensor is used to acquire the actual ambient temperature; The memory stores computer-executable instructions; The processor executes the computer-executable instructions stored in the memory to implement the control method of the heat pump water heater according to any one of claims 1-9.

12. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions, which are used to implement the control method of the heat pump water heater according to any one of claims 1-9 when executed.

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