Control method and device of air energy heat pump water heater

Abstract

The application discloses a control method and device of an air energy heat pump water heater, and the method comprises the following steps: obtaining the enabling state of a temperature sensor; determining the equivalent water temperature and the equivalent water temperature detection state of a balance water tank based on the enabling state of the temperature sensor; determining the equivalent actual outlet water temperature of the balance water tank based on the enabling state of the temperature sensor, the equivalent water temperature and the equivalent water temperature detection state of the balance water tank; obtaining the set temperature of a terminal heating device, and performing start-stop control on an outdoor unit based on the equivalent actual outlet water temperature of the balance water tank and the set temperature. When the equivalent water temperature detection state of the balance water tank fails, the equivalent actual outlet water temperature of the balance water tank can still be calculated, and the equivalent actual outlet water temperature of the balance water tank can be used as a key parameter of the constant terminal device heating demand, so that the system can still work normally when the key temperature sensor fails, the use demand of the user is ensured, and the user experience is improved.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and more specifically, to a control method and device for an air source heat pump water heater. Background Technology

[0002] Air source heat pump water heaters typically include an air conditioner, water module, underfloor heating, and heat exchange fins. With the increasing popularity of air source heat pump water heaters, more and more users are using them as the primary heating system for their homes. To ensure a stable outlet water temperature, a balancing tank is usually installed between the hot water outlet of the water module and the heating equipment. The actual outlet water temperature of the balancing tank better reflects the actual inlet water temperature of the terminal heating equipment, allowing for the allocation of heating demand to each terminal heating device based on the balancing tank's actual outlet water temperature. However, in actual use, malfunctions of critical temperature sensors in air source heat pump water heaters can easily lead to system failure. For example, a malfunctioning sensor in the balancing tank may prevent the detection of the actual outlet water temperature, thus hindering the accurate allocation of heating demand to the terminal heating equipment, failing to meet users' emergency needs, and reducing the user experience. Summary of the Invention

[0003] To address the aforementioned issues, this invention provides a control method and device for an air-source heat pump water heater. This method uses the equivalent actual outlet water temperature of the balance tank as a key parameter for the heating demand of the constant-quantity terminal equipment, ensuring the system can still operate normally even when the critical temperature sensor malfunctions, thus guaranteeing the user's needs and improving the user experience.

[0004] According to an embodiment of the present invention, a control method for an air source heat pump water heater is provided. The air source heat pump water heater includes an outdoor unit, multiple terminal heating devices, and a balancing water tank. The balancing water tank is disposed between the outdoor unit and the terminal heating devices. A temperature sensor is installed in the balancing water tank. The control method for the air source heat pump water heater includes: Obtain the enable state of the temperature sensor; wherein, the enable state includes an enabled state and an disabled state; The equivalent water temperature and equivalent water temperature detection status of the balance tank are determined based on the enabled state of the temperature sensor; wherein, the equivalent water temperature detection status includes a fault state and a normal state. The equivalent actual outlet water temperature of the balance water tank is determined based on the enabled state of the temperature sensor, the equivalent water temperature of the balance water tank, and the equivalent water temperature detection state. The set temperature of the terminal heating equipment is obtained, and the outdoor unit is controlled to start and stop based on the equivalent actual outlet water temperature of the balance water tank and the set temperature.

[0005] By adopting the above technical solution, a temperature sensor is installed in the balance water tank. The equivalent water temperature and equivalent water temperature detection status of the balance water tank are determined based on the enable status of the temperature sensor. The equivalent actual outlet water temperature of the balance water tank is then determined based on the enable status of the temperature sensor, the equivalent water temperature of the balance water tank, and the equivalent water temperature detection status. Even when the equivalent water temperature detection status of the balance water tank malfunctions, the equivalent actual outlet water temperature of the balance water tank can still be calculated. Therefore, the equivalent actual outlet water temperature of the balance water tank can be used as a key parameter for the heating demand of the constant quantity terminal equipment. This ensures that the system can still operate normally when the key temperature sensor malfunctions, guaranteeing the user's needs and improving the user experience.

[0006] Preferably, a first temperature sensor is provided at the upper part of the balancing water tank, and a second temperature sensor is provided at the lower part of the balancing water tank. The step of determining the equivalent water temperature of the balancing water tank and the equivalent water temperature detection status based on the enabling state of the temperature sensor includes: When the first temperature sensor is enabled and the second temperature sensor is disabled, the first water temperature detected by the first temperature sensor is taken as the equivalent water temperature of the balance tank, and the current state of the first temperature sensor is taken as the equivalent water temperature detection state; wherein, the current state includes fault state and normal state. When the first temperature sensor is in the disabled state and the second temperature sensor is in the enabled state, the second water temperature detected by the second temperature sensor is taken as the equivalent water temperature of the balance tank, and the current state of the second temperature sensor is taken as the equivalent water temperature detection state. When both the first temperature sensor and the second temperature sensor are in the enabled state, the current state of the first temperature sensor and the second temperature sensor is obtained, and the equivalent water temperature and equivalent water temperature detection status of the balance water tank are determined based on the current state of the first temperature sensor and the second temperature sensor.

[0007] By adopting the above technical solution, the equivalent temperature of the balance tank is determined according to the enabling state of the temperature sensor, realizing the flexible configuration of the temperature sensor in the balance tank, thereby quickly and accurately detecting the equivalent temperature of the balance tank, and improving the convenience and flexibility of equivalent temperature detection of the balance tank.

[0008] Preferably, the air source heat pump water heater further includes a water module, which is disposed between the outdoor unit and the balance tank. The step of determining the equivalent water temperature of the balance tank and the equivalent water temperature detection status based on the current states of the first temperature sensor and the second temperature sensor includes: When both the first temperature sensor and the second temperature sensor are in a fault state, the first water temperature detected by the first temperature sensor is taken as the equivalent water temperature of the balance tank, and the equivalent water temperature detection state is determined to be a fault state. When the current state of the first temperature sensor is normal and the current state of the second temperature sensor is faulty, the current state of the return water temperature sensor of the water module is obtained. If the current state of the return water temperature sensor is faulty, the first water temperature is taken as the equivalent water temperature of the balance tank, and the equivalent water temperature detection state is determined to be normal. If the current state of the return water temperature sensor is normal, the average value of the first water temperature and the return water temperature detected by the return water temperature sensor is taken as the equivalent water temperature of the balance tank, and the equivalent water temperature detection state is determined to be normal. When the current state of the first temperature sensor is faulty and the current state of the second temperature sensor is normal, the current state of the return water temperature sensor of the water module is obtained. If the current state of the return water temperature sensor is faulty, the second water temperature is used as the equivalent water temperature of the balance tank, and the equivalent water temperature detection state is determined to be normal. If the current state of the return water temperature sensor is normal, the average value of the second water temperature and the return water temperature is used as the equivalent water temperature of the balance tank, and the equivalent water temperature detection state is determined to be normal. When both the first temperature sensor and the second temperature sensor are in a normal state, the average value of the first water temperature and the second water temperature is taken as the equivalent water temperature of the balance tank, and the equivalent water temperature detection state is determined to be normal.

[0009] By adopting the above technical solution, it is possible to determine whether the first temperature sensor and the second temperature sensor are in a faulty state. When the temperature sensor fails, the temperature detection value that best matches the balance tank is selected as the equivalent water temperature of the balance tank. Even when the critical temperature sensor of the balance tank fails, the equivalent temperature of the balance tank can still be estimated, so that the unit can still work normally, ensuring the user's emergency use needs to the greatest extent and reducing user inconvenience caused by untimely temperature sensor maintenance.

[0010] Preferably, the step of determining the equivalent actual outlet water temperature of the balance water tank based on the enabled state of the temperature sensor, the equivalent water temperature of the balance water tank, and the equivalent water temperature detection state includes: When both the first temperature sensor and the second temperature sensor are in an inactive state, the outlet water temperature detected by the outlet water temperature sensor of the water module is taken as the equivalent actual outlet water temperature. When the first temperature sensor or the second temperature sensor is enabled, determine whether to enter the winter antifreeze mode. If so, determine whether the equivalent water temperature detection status of the balance water tank is faulty. When the equivalent water temperature detection status of the balance water tank is in a fault state, and the current status of the return water temperature sensor is in a fault state, the outlet water temperature detected by the outlet water temperature sensor of the water module is taken as the equivalent actual outlet water temperature. When the equivalent water temperature detection status of the balance water tank is in a fault state and the current status of the return water temperature sensor is in a normal state, the return water temperature detected by the return water temperature sensor of the water module is taken as the equivalent actual outlet water temperature. When the equivalent water temperature detection status of the balance water tank is normal, the equivalent water temperature of the balance water tank is taken as the equivalent actual outlet water temperature.

[0011] By adopting the above technical solution, the equivalent actual outlet temperature of the balance water tank is determined based on the equivalent water temperature detection status of the balance water tank and the current status of the return water temperature sensor. The estimated equivalent actual outlet temperature of the balance water tank is obtained by the temperature sensor based on the normal detection status, which improves the detection accuracy of the equivalent actual outlet temperature of the balance water tank, thereby improving the reliability of the heat demand allocation of the terminal heating equipment.

[0012] Preferably, the control method for the air source heat pump water heater further includes: When the winter antifreeze mode is not entered, if the equivalent water temperature detection status of the balance water tank is in a fault state, the return water temperature detected by the return water temperature sensor of the water module will be used as the equivalent actual outlet water temperature. If the equivalent water temperature detection status of the balance water tank is normal, the equivalent water temperature of the balance water tank shall be used as the equivalent actual outlet water temperature.

[0013] By adopting the above technical solution, the terminal heating equipment includes underfloor heating, and an underfloor heating water pump, a control valve, and an underfloor heating inlet water temperature sensor are installed on the water inlet pipe between the underfloor heating system and the balance water tank. The control method of the air source heat pump water heater further includes: When only the underfloor heating is turned on and the underfloor heating inlet water temperature sensor is enabled, the underfloor heating water pump is turned on and the underfloor heating inlet water temperature detected by the underfloor heating inlet water temperature sensor is obtained. The operating mode of the control valve is switched based on the inlet water temperature and the set temperature of the underfloor heating system; wherein, the operating mode of the control valve includes a mixing mode and a heating mode.

[0014] Preferably, when the underfloor heating mode is turned on, the operating mode of the control valve is switched according to the inlet water temperature and the set temperature of the underfloor heating system to adjust the water temperature entering the underfloor heating system, ensuring that the underfloor heating water temperature meets the user's heating needs and improving the user experience.

[0015] By adopting the above technical solution, a return water pipe is also connected between the underfloor heating system and the balance water tank. The step of switching the operating mode of the control valve based on the inlet water temperature and the set temperature of the underfloor heating system includes: When the inlet water temperature of the underfloor heating system is greater than the first preset temperature, the control valve is switched to the mixing mode so that the low-temperature water in the return water pipe enters the inlet water pipe; wherein, the first preset temperature is the sum of the underfloor heating system set temperature and the underfloor heating system start-up hysteresis temperature. When the inlet water temperature of the underfloor heating system is greater than or equal to the second preset temperature and less than or equal to the first preset temperature, the control valve is controlled to periodically switch between the mixing mode and the heating mode; wherein, the second preset temperature is the sum of the underfloor heating set temperature and the underfloor heating shutdown hysteresis temperature; When the temperature of the inlet water for the underfloor heating is lower than the second preset temperature, the control valve is switched to the heating mode so that the hot water in the inlet pipe enters the underfloor heating pipe.

[0016] Preferably, the control valve is switched according to the relationship between the inlet water temperature and the set temperature of the underfloor heating system to increase or decrease the inlet water temperature, so that the inlet water temperature is kept near the set temperature of the underfloor heating system, thereby meeting the user's underfloor heating needs and improving the user's comfort.

[0017] Preferably, the terminal heating equipment includes underfloor heating, an indoor unit, and heat exchange fins; the step of controlling the start-up and shutdown of the outdoor unit based on the equivalent actual outlet water temperature of the balance water tank and the set temperature includes: When the equivalent actual outlet water temperature of the balance water tank is lower than the set temperature, the outdoor unit and the water module are controlled to start running in order to increase the equivalent actual outlet water temperature of the balance water tank. When the equivalent actual outlet water temperature of the balance water tank is greater than the set temperature, the outdoor unit and the water module are controlled to stop operating in order to reduce the equivalent actual outlet water temperature of the balance water tank.

[0018] By adopting the above technical solution, the opening and closing of the outdoor unit and water module are controlled according to the relationship between the equivalent actual outlet temperature of the balance water tank and the set temperature of the terminal heating equipment. This realizes the control of the water temperature heat exchange rate of the unit according to the heating demand of the terminal heating equipment, and improves the reliability of the unit's heating control.

[0019] According to an embodiment of the present invention, another aspect provides a control device for an air source heat pump water heater. The air source heat pump water heater includes an outdoor unit, multiple terminal heating devices, and a balancing water tank. The balancing water tank is disposed between the outdoor unit and the terminal heating devices. A temperature sensor is disposed in the balancing water tank. The control device for the air source heat pump water heater includes: An acquisition module is used to acquire the enable state of the temperature sensor; wherein, the enable state includes an enabled state and an disabled state; The first determining module is used to determine the equivalent water temperature and equivalent water temperature detection status of the balance water tank based on the enabling state of the temperature sensor; wherein, the equivalent water temperature detection status includes a fault state and a normal state. The second determining module is used to determine the equivalent actual outlet water temperature of the balance water tank based on the enabling state of the temperature sensor, the equivalent water temperature of the balance water tank, and the equivalent water temperature detection state. The control module is used to obtain the set temperature of the terminal heating equipment and control the start and stop of the outdoor unit based on the equivalent actual outlet water temperature of the balance water tank and the set temperature.

[0020] According to an embodiment of the present invention, another aspect provides an air source heat pump water heater, including: an outdoor unit, a water module, multiple terminal heating devices, a balance water tank and a controller, wherein the balance water tank is disposed between the outdoor unit and the terminal heating devices, the water module is disposed between the outdoor unit and the balance water tank, and a temperature sensor is disposed in the balance water tank; The controller includes a computer-readable storage medium storing a computer program, which is read and executed by the processor to implement the method as described in any of the first aspects.

[0021] The present invention has the following beneficial effects: By setting a temperature sensor in the balanced water tank, the equivalent water temperature and equivalent water temperature detection status of the balanced water tank are determined according to the enabling state of the temperature sensor. The equivalent actual outlet water temperature of the balanced water tank is determined according to the enabling state of the temperature sensor, the equivalent water temperature of the balanced water tank, and the equivalent water temperature detection status. Even when the equivalent water temperature detection status of the balanced water tank fails, the equivalent actual outlet water temperature of the balanced water tank can still be calculated. Thus, the equivalent actual outlet water temperature of the balanced water tank can be used as a key parameter for the heating demand of constant quantity terminal equipment, so that the system can still work normally when the key temperature sensor fails, ensuring the user's usage needs and improving the user experience. Attached Figure Description

[0022] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0023] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0024] Figure 1 This invention provides a schematic diagram of the structure of an air source heat pump water heater; Figure 2 A flowchart of a control method for an air source heat pump water heater provided by the present invention; Figure 3 This invention provides a schematic diagram of water circulation under a mixed-water mode for underfloor heating. Figure 4 This invention provides a schematic diagram of water circulation under a floor heating mode. Figure 5 This invention provides a schematic diagram of the control device structure for an air source heat pump water heater. Detailed Implementation

[0025] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0027] This embodiment provides an air source heat pump water heater, see below. Figure 1The diagram shows the structure of an air source heat pump water heater. The air source heat pump water heater includes: an outdoor unit 11, a water module 12, multiple terminal heating devices, a balance water tank 13, and a controller (not shown in the figure). The balance water tank 13 is located between the outdoor unit 11 and the terminal heating devices. The water module 12 is located between the outdoor unit 11 and the balance water tank 13. A temperature sensor is installed in the balance water tank 13.

[0028] The water module 12 is used to exchange heat between the water in the unit pipeline and the refrigerant entering the water module 12 from the outdoor unit 11 to raise the water temperature. The heated water enters the outlet pipeline through the main outlet valve 121 of the water module 12, and then enters each terminal heating device after passing through the balance water tank 13.

[0029] like Figure 1 As shown, Figure 1 The dark gray pipe in the image is the water outlet pipe of water module 12 (that is, the water inlet pipe of each terminal heating device). Figure 1 The light gray pipe in the middle is the return water pipe of the water module, that is, the return water after heat dissipation in each terminal heating equipment. The water in the return water pipe enters the water module after passing through the return water main valve 122 of the water module 12 to exchange heat with the refrigerant and absorb the heat of the refrigerant.

[0030] like Figure 1 As shown, a circulating water pump P1 is installed in the water module 12 to ensure sufficient water circulation in the pipes. A drain valve 123 is also installed on the outlet pipe of the water module 12, and a water supply valve 124 is installed on the return pipe. Taking the installation of two temperature sensors in the balance water tank as an example, the upper part of the balance water tank 13 is equipped with a first temperature sensor BT1, and the lower part is equipped with a second temperature sensor BT2.

[0031] The aforementioned terminal heating equipment includes an indoor unit 14, heat exchange fins 15, and underfloor heating 16. The air source heat pump water heater provided in this embodiment may also include a hot water tank 17. The water in the hot water tank 17 can be heated by solar panels, and can also enter the water module 12 to exchange heat with the refrigerant and store the user's domestic water.

[0032] like Figure 1 As shown, an external circulation pump P2 is installed on the connecting pipe of the hot water tank 17, and a floor heating water pump P3, a control valve MV2, and a floor heating inlet water temperature sensor FLH are installed on the inlet pipe between the floor heating system and the balance water tank.

[0033] This embodiment provides a control method for an air source heat pump water heater. This method can be applied to the air source heat pump water heater provided in the above embodiment, see below. Figure 2 The flowchart shown is a control method for an air source heat pump water heater. This method mainly includes the following steps S202 to S208: Step S202: Obtain the enable state of the temperature sensor; The enabled state of the temperature sensor includes an enabled state and an disabled state, that is, whether the temperature detection value of the temperature sensor will be used during the control process. The temperature sensor can detect the water temperature in the balance tank in both the enabled and disabled states.

[0034] Step S204: Determine the equivalent water temperature and equivalent water temperature detection status of the balance tank based on the enable state of the temperature sensor; The equivalent water temperature detection status mentioned above includes fault status and normal status; the equivalent water temperature detection status is related to the current status of the temperature sensor in the balance tank. The balance tank can contain one or more temperature sensors. When a temperature sensor in the balance tank has an open circuit or short circuit problem, that temperature sensor is determined to be in a fault state.

[0035] When there is a temperature sensor in the balance tank that is not in a faulty state (i.e., in a normal state), the equivalent water temperature of the balance tank can be detected normally, and the equivalent water temperature detection status of the balance tank can be determined as normal. The equivalent water temperature of the balance tank can be determined based on the water temperature detected by the temperature sensor in normal state.

[0036] Step S206: Determine the equivalent actual outlet water temperature of the balance tank based on the enabled state of the temperature sensor, the equivalent water temperature of the balance tank, and the equivalent water temperature detection state. When the temperature sensor is enabled, the equivalent actual outlet water temperature of the balance water tank is determined based on the equivalent water temperature of the balance water tank and the equivalent water temperature detection status. This equivalent actual outlet water temperature can reflect the inlet water temperature of each terminal heating device, thereby constantly measuring the heating demand of the terminal heating device.

[0037] When the temperature sensor is disabled, the equivalent actual outlet water temperature of the balance tank needs to be determined based on the water temperature detected by other temperature sensors, such as the inlet or outlet water temperature of the water module.

[0038] Step S208: Obtain the set temperature of the terminal heating equipment, and control the start-up and shutdown of the terminal heating equipment based on the equivalent actual outlet water temperature of the balance water tank and the set temperature.

[0039] The aforementioned terminal heating equipment may include indoor units of air conditioners, heat exchange fins (i.e., radiators), and underfloor heating. The aforementioned set temperature may be the water temperature required by each terminal heating device to achieve indoor heating, and the set temperatures of each terminal heating device may be the same or different. Since the equivalent actual outlet temperature of the aforementioned balance water tank is approximately the actual water temperature entering the indoor unit and heat exchange fins, the relationship between the equivalent actual outlet temperature and the set temperature of the indoor unit and heat exchange fins is determined. When the equivalent actual outlet temperature is lower than the set temperature, that is, the water temperature entering the terminal heating equipment is too low and does not meet the heating demand, it is necessary to increase the equivalent actual outlet temperature of the balance water tank and control the outdoor unit to start operating, so as to increase the heat exchange rate of the water in the system and increase the equivalent actual outlet temperature of the balance water tank.

[0040] In one specific implementation, the aforementioned terminal heating equipment includes underfloor heating, an indoor unit, and heat exchange fins; when the equivalent actual outlet water temperature of the balancing water tank is lower than the set temperature, the outdoor unit and water module are controlled to start operation to increase the equivalent actual outlet water temperature of the balancing water tank; when the equivalent actual outlet water temperature of the balancing water tank is higher than the set temperature, the outdoor unit and water module are controlled to stop operation to decrease the equivalent actual outlet water temperature of the balancing water tank.

[0041] By controlling the opening and closing of the outdoor unit and water module based on the relationship between the equivalent actual outlet water temperature of the balance water tank and the set temperature of the terminal heating equipment, the unit's water temperature heat exchange rate is controlled according to the heating demand of the terminal heating equipment, thereby improving the reliability of the unit's heating control.

[0042] The control method for the air source heat pump water heater provided in this embodiment, by setting a temperature sensor in the balance water tank, determines the equivalent water temperature and equivalent water temperature detection status of the balance water tank based on the enabling state of the temperature sensor, and determines the equivalent actual outlet water temperature of the balance water tank based on the enabling state of the temperature sensor, the equivalent water temperature of the balance water tank, and the equivalent water temperature detection status. Even when the equivalent water temperature detection status of the balance water tank fails, the equivalent actual outlet water temperature of the balance water tank can still be calculated. Thus, the equivalent actual outlet water temperature of the balance water tank can be used as a key parameter for the heating demand of the constant quantity terminal equipment, enabling the system to continue to work normally even when the key temperature sensor fails, ensuring the user's needs and improving the user experience.

[0043] In one embodiment, a first temperature sensor BT1 is provided at the upper part of the balance tank, and a second temperature sensor BT2 is provided at the lower part of the balance tank. This embodiment provides an implementation method for determining the equivalent water temperature of the balance tank and the equivalent water temperature detection status based on the enabled state of the temperature sensors. The specific steps are as follows: Step (1): When the first temperature sensor is enabled and the second temperature sensor is disabled, the first water temperature detected by the first temperature sensor is taken as the equivalent water temperature of the balance tank, and the current state of the first temperature sensor is taken as the equivalent water temperature detection state. The first temperature sensor can detect the water temperature at the top of the balancing tank, and the second temperature sensor can detect the water temperature at the bottom of the balancing tank. The enable status of both the first and second temperature sensors can be set by the user, i.e., whether to use the temperature values ​​detected by these sensors for subsequent control.

[0044] The equivalent water temperature TWT_BT of the aforementioned balance tank can also be called the combined water temperature of the balance tank (i.e., the combined water temperature of the upper and lower parts of the balance tank). When the first temperature sensor is enabled and the second temperature sensor is disabled, the first water temperature TWT_BT1 detected by the first temperature sensor is assigned to the equivalent water temperature of the balance tank, that is, TWT_BT = TWT_BT1. The current state of the first temperature sensor is the equivalent water temperature detection state of the balance tank. This current state includes fault states (including open circuit and short circuit) and normal states.

[0045] Step (2): When the first temperature sensor is disabled and the second temperature sensor is enabled, the second water temperature detected by the second temperature sensor is taken as the equivalent water temperature of the balance tank, and the current state of the second temperature sensor is taken as the equivalent water temperature detection state. When the first temperature sensor is disabled and the second temperature sensor is enabled, since the first temperature sensor is disabled, the second water temperature TWT_BT2 detected by the second temperature sensor is assigned to the equivalent water temperature of the balance tank, that is, TWT_BT = TWT_BT2. The current state of the second temperature sensor is the equivalent water temperature detection state of the balance tank.

[0046] In one implementation, when both the first and second temperature sensors are disabled, TWT_BT = TWT_BT1 is set, and the current state of the first temperature sensor is used as the equivalent water temperature detection state of the balance tank. Since both the first and second temperature sensors are disabled, the equivalent water temperature of the balance tank obtained here is not used subsequently.

[0047] Step (3): When both the first temperature sensor and the second temperature sensor are enabled, obtain the current state of the first temperature sensor and the second temperature sensor, and determine the equivalent water temperature and equivalent water temperature detection state of the balance tank based on the current state of the first temperature sensor and the second temperature sensor.

[0048] When both the first and second temperature sensors are enabled, the equivalent water temperature and its detection status in the balance tank need to be determined based on their respective fault states. By determining the equivalent temperature of the balance tank based on the enable status of the temperature sensors, flexible configuration of temperature sensors within the balance tank is achieved, enabling rapid and accurate detection of the equivalent temperature and improving the convenience and flexibility of equivalent temperature detection.

[0049] In one specific implementation, when both the first temperature sensor and the second temperature sensor are in a fault state, the first water temperature detected by the first temperature sensor is taken as the equivalent water temperature of the balance tank, and the equivalent water temperature detection state is determined to be a fault state. When both the first and second temperature sensors are in a fault state, TWT_BT = TWT_BT1. The current state of the first temperature sensor is taken as the equivalent water temperature detection state of the balance tank, that is, the equivalent water temperature detection state of the balance tank is a fault state, so as to prompt the user to carry out maintenance in time.

[0050] When the current state of the first temperature sensor is normal and the current state of the second temperature sensor is faulty, the current state of the return water temperature sensor of the water module is obtained. If the current state of the return water temperature sensor is faulty, the first water temperature is used as the equivalent water temperature of the balance tank, and the equivalent water temperature detection state is determined to be normal. If the current state of the return water temperature sensor is normal, the average value of the first water temperature and the return water temperature TWI detected by the return water temperature sensor is used as the equivalent water temperature of the balance tank, and the equivalent water temperature detection state is determined to be normal. The aforementioned return water temperature sensor is installed at the inlet of the return water pipe of the water module. If the first temperature sensor is in a normal state, the second temperature sensor is in a fault state, and the return water temperature sensor is in a fault state, TWT_BT = TWT_BT1. The current state of the first temperature sensor is taken as the equivalent water temperature detection state of the balance tank, that is, the equivalent water temperature detection state of the balance tank is in a normal state.

[0051] If the first temperature sensor is in normal condition, the second temperature sensor is in fault condition, and the return water temperature sensor is in normal condition, then TWT_BT = (TWT_BT1 + TWI) / 2, and the equivalent water temperature detection status is determined to be normal.

[0052] When the current state of the first temperature sensor is faulty and the current state of the second temperature sensor is normal, the current state of the return water temperature sensor of the water module is obtained. If the current state of the return water temperature sensor is faulty, the second water temperature is used as the equivalent water temperature of the balance tank, and the equivalent water temperature detection state is determined to be normal. If the current state of the return water temperature sensor is normal, the average value of the second water temperature and the return water temperature is used as the equivalent water temperature of the balance tank, and the equivalent water temperature detection state is determined to be normal. If the current state of the first temperature sensor is faulty, the current state of the second temperature sensor is normal, and the return water temperature sensor is faulty, TWT_BT = TWT_BT2. The current state of the second temperature sensor is taken as the equivalent water temperature detection state of the balance tank, that is, the equivalent water temperature detection state of the balance tank is normal.

[0053] If the current state of the first temperature sensor is faulty, the current state of the second temperature sensor is normal, and the return water temperature sensor is normal, then TWT_BT = (TWT_BT2 + TWI) / 2, and the equivalent water temperature detection state is determined to be normal.

[0054] When both the first and second temperature sensors are in normal condition, the average value of the first and second water temperatures is taken as the equivalent water temperature of the balance tank, and the equivalent water temperature detection status is determined to be normal.

[0055] If both the first and second temperature sensors are in normal condition, TWT_BT = (TWT_BT1 + TWT_BT2) / 2, and the equivalent water temperature detection status is determined to be normal.

[0056] By determining whether the first and second temperature sensors are faulty, and selecting the temperature detection value that best matches the balance tank as the equivalent water temperature when the temperature sensor fails, the equivalent temperature of the balance tank can still be estimated even when the critical temperature sensor of the balance tank fails. This allows the unit to continue to operate normally, maximizing the guarantee of users' emergency use needs and reducing user inconvenience caused by untimely temperature sensor repairs.

[0057] In one embodiment, this embodiment provides an implementation method for determining the equivalent actual outlet water temperature of the balance water tank based on the enabled state of a temperature sensor, the equivalent water temperature of the balance water tank, and the equivalent water temperature detection state. The specific steps are as follows: Step 1): When both the first and second temperature sensors are in an inactive state, the outlet water temperature detected by the outlet water temperature sensor of the water module is taken as the equivalent actual outlet water temperature. If neither the first nor the second temperature sensor is activated, the water temperature detected by the first nor the second temperature sensor will not be used. A water temperature sensor is installed at the outlet of the water module. Since the hot water outlet of the water module is connected to the inlet of the balance tank, the outlet water temperature of the water module is close to the temperature of the balance tank. This allows the equivalent actual outlet water temperature of the balance tank to be equal to the outlet water temperature detected by the water module's outlet water temperature sensor.

[0058] Step 2): When the first temperature sensor or the second temperature sensor is enabled, determine whether to enter the winter antifreeze mode. If so, determine whether the equivalent water temperature detection status of the balance tank is faulty. If both the first and second temperature sensors are enabled, determine whether to enter the winter anti-freeze mode. When the unit is shut down and the outdoor ambient temperature is lower than the preset temperature, there is a risk of pipe freezing, and the winter anti-freeze mode is entered.

[0059] When the equivalent water temperature detection status of the balance water tank is in a fault state, and the current status of the return water temperature sensor is in a fault state, the outlet water temperature detected by the outlet water temperature sensor of the water module is taken as the equivalent actual outlet water temperature. When the equivalent water temperature detection status of the balance water tank is in a fault state and the current status of the return water temperature sensor is in a normal state, the return water temperature detected by the return water temperature sensor of the water module is taken as the equivalent actual outlet water temperature. When the equivalent water temperature detection status of the balance tank is normal, the equivalent water temperature of the balance tank is taken as the equivalent actual outlet water temperature.

[0060] The equivalent actual outlet temperature of the balance water tank is determined by the equivalent water temperature detection status of the balance water tank and the current status of the return water temperature sensor. The estimated equivalent actual outlet temperature of the balance water tank is obtained by the temperature sensor based on the normal detection status, which improves the detection accuracy of the equivalent actual outlet temperature of the balance water tank, thereby improving the reliability of the heat demand distribution of the terminal heating equipment.

[0061] Step 3): When the winter antifreeze mode is not entered, if the equivalent water temperature detection status of the balance water tank is in a fault state, the return water temperature detected by the return water temperature sensor of the water module will be used as the equivalent actual outlet water temperature; if the equivalent water temperature detection status of the balance water tank is in a normal state, the equivalent water temperature of the balance water tank will be used as the equivalent actual outlet water temperature.

[0062] When the unit is turned on or off, and the outdoor ambient temperature is higher than the preset temperature, there is no risk of pipe freezing, confirming that the winter anti-freeze mode has not been entered. The equivalent water temperature closest to the overall water temperature of the balance tank is determined based on the equivalent water temperature detection status, improving the accuracy of the detection of the equivalent actual outlet water temperature of the balance tank.

[0063] Considering the high inertia of water in the unit, the circulating water pump needs to be started during the water temperature acquisition process to ensure that the water in the unit is fully circulated and that there is no stagnant water or insufficient mixing of water in each terminal area, so as to improve the accuracy of the water temperature detection by the temperature sensor.

[0064] In one embodiment, the method provided in this embodiment further includes: When only the underfloor heating is turned on, and the underfloor heating inlet water temperature sensor is enabled, the underfloor heating water pump is turned on to obtain the underfloor heating inlet water temperature detected by the underfloor heating inlet water temperature sensor; the operating mode of the control valve is switched based on the underfloor heating inlet water temperature and the underfloor heating set temperature; the operating modes of the control valve include mixing mode and heating mode.

[0065] When controlling the on / off state of the terminal heating equipment, if only the underfloor heating mode is activated, the underfloor heating water pump is turned on, and the control valve at the inlet of the underfloor heating pipes is controlled according to the inlet water temperature and the set temperature, so that the underfloor heating system switches to the corresponding operating mode. By switching the operating mode of the control valve according to the inlet water temperature and the set temperature when the underfloor heating mode is activated, the water temperature entering the underfloor heating system is regulated to ensure that the underfloor heating water temperature meets the user's heating needs, thus improving the user experience.

[0066] In one implementation, the control valve at the inlet of the underfloor heating pipe is closed when the underfloor heating mode is turned off, or when the underfloor heating mode is turned on and the underfloor heating inlet water temperature sensor is in an inactive state.

[0067] In one embodiment, this embodiment provides a specific implementation method for the operation mode of the control valve based on the inlet water temperature and the set temperature of the underfloor heating system: When the inlet water temperature of the underfloor heating system is higher than the first preset temperature, the control valve switches to the mixing mode to allow the low-temperature water in the return water pipe to enter the inlet water pipe. The first preset temperature is the sum of the underfloor heating set temperature and the underfloor heating start-up hysteresis temperature (which can range from 1 to 3 degrees Celsius). When the inlet water temperature of the underfloor heating is greater than or equal to the second preset temperature and less than or equal to the first preset temperature, the control valve is periodically switched between mixing mode and heating mode; wherein, the second preset temperature is the sum of the underfloor heating set temperature and the underfloor heating shutdown hysteresis temperature (the value range can be 1~3 degrees); When the temperature of the inlet water for the underfloor heating is lower than the second preset temperature, the control valve switches to heating mode so that the hot water in the inlet pipe enters the underfloor heating pipe.

[0068] When the inlet water temperature for underfloor heating is higher than the first preset temperature, i.e., the inlet water temperature is too high, it is necessary to lower the inlet water temperature. See below. Figure 3The diagram shown illustrates the water circulation in the underfloor heating mixing mode. The water entering the underfloor heating system circulates with the water in the return pipe. Since the water in the return pipe cools down after dissipating heat in the underfloor heating pipes, mixing the water in the return pipes with the water in the underfloor heating inlet pipes can lower the underfloor heating inlet water temperature, bringing it closer to the set temperature of the underfloor heating system.

[0069] When the inlet water temperature of the underfloor heating system is greater than or equal to the second preset temperature and less than or equal to the first preset temperature, the inlet water temperature of the underfloor heating system is moderate. In order to maintain this inlet water temperature, the control valve of the underfloor heating system is switched to the mixing mode and runs for a first preset time (the value range can be 1~3 minutes, preferably 3 minutes). Then, the control valve of the underfloor heating system is switched to the heating mode and runs for a second preset time (the value range can be 1~3 minutes, preferably 3 minutes), and this cycle is repeated. The first preset time and the second preset time can be equal or different.

[0070] When the inlet water temperature for underfloor heating is lower than the second preset temperature, i.e., the inlet water temperature is too low, it is necessary to raise the inlet water temperature. See below. Figure 4 The diagram shown illustrates the water circulation in the underfloor heating mode. By inputting heated water into the underfloor heating pipes, the water temperature can be increased, bringing it closer to the set temperature of the underfloor heating system.

[0071] By switching control valves according to the relationship between the inlet water temperature and the set temperature of the underfloor heating system, the inlet water temperature can be increased or decreased to keep it close to the set temperature, thereby meeting the user's underfloor heating needs and improving user comfort.

[0072] The control method for the air source heat pump water heater provided in this embodiment improves user convenience and comfort through flexible configuration of water temperature sensors; through temperature sensor acquisition algorithms, the unit can still work normally even after the water temperature sensor in an important location fails, maximizing the guarantee of users' emergency use needs and reducing user inconvenience caused by untimely maintenance.

[0073] Corresponding to the control method for the air source heat pump water heater provided in the above embodiments, this invention provides a control device for an air source heat pump water heater. This device can be applied to the air source heat pump water heater provided in the above embodiments, see below. Figure 5 The diagram shows the control device structure of an air source heat pump water heater. This device includes the following modules: The acquisition module 51 is used to acquire the enable state of the temperature sensor; wherein the enable state includes an enabled state and an disabled state. The first determining module 52 is used to determine the equivalent water temperature and equivalent water temperature detection status of the balance tank based on the enabling state of the temperature sensor; wherein, the equivalent water temperature detection status includes fault status and normal status. The second determining module 53 is used to determine the equivalent actual outlet water temperature of the balance water tank based on the enabling state of the temperature sensor, the equivalent water temperature of the balance water tank, and the equivalent water temperature detection state. The control module 54 is used to obtain the set temperature of the terminal heating equipment and control the start and stop of the outdoor unit based on the equivalent actual outlet water temperature of the balance water tank and the set temperature.

[0074] The control device for the air source heat pump water heater provided in this embodiment, by installing a temperature sensor in the balance water tank, determines the equivalent water temperature and equivalent water temperature detection status of the balance water tank based on the enabling state of the temperature sensor, and determines the equivalent actual outlet water temperature of the balance water tank based on the enabling state of the temperature sensor, the equivalent water temperature of the balance water tank, and the equivalent water temperature detection status. Even when the equivalent water temperature detection status of the balance water tank malfunctions, the equivalent actual outlet water temperature of the balance water tank can still be calculated. Thus, the equivalent actual outlet water temperature of the balance water tank can be used as a key parameter for the heating demand of the constant quantity terminal equipment, enabling the system to continue to work normally even when the key temperature sensor malfunctions, ensuring the user's needs and improving the user experience.

[0075] Corresponding to the control method of the air source heat pump water heater provided in the above embodiments, this embodiment provides an air source heat pump water heater, which includes a computer-readable storage medium storing a computer program and a processor. The computer program is read and run by the processor to implement the control method of the air source heat pump water heater provided in the above embodiments.

[0076] This embodiment also provides a computer-readable storage medium storing a computer program. When executed by a processor, this computer program implements the various processes of the control method embodiment for the air-source heat pump water heater described above, and achieves the same technical effect. To avoid repetition, it will not be described again here. The computer-readable storage medium may be a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, etc.

[0077] Of course, those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by computer-controlled devices. The program can be stored in a computer-readable storage medium. When the program is executed, it can include the processes of the above method embodiments. The storage medium can be a memory, a disk, an optical disk, etc.

[0078] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

[0079] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. Regarding the control method and air source heat pump water heater disclosed in the embodiments, since they correspond to the control method, the description is relatively simple; relevant parts can be found in the method section. The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0080] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A control method for an air source heat pump water heater, characterized in that, The air source heat pump water heater includes an outdoor unit, multiple terminal heating devices, a water module, and a balancing water tank. The balancing water tank is located between the outdoor unit and the terminal heating devices. A temperature sensor is installed in the balancing water tank; a first temperature sensor is located at the top of the balancing water tank, and a second temperature sensor is located at the bottom of the balancing water tank. The water module is located between the outdoor unit and the balancing water tank, and a return water temperature sensor is located at the inlet of the return water pipe of the water module. The control method of the air source heat pump water heater includes: Obtain the enable state of the temperature sensor; wherein, the enable state includes an enabled state and an disabled state; The equivalent water temperature and equivalent water temperature detection status of the balance tank are determined based on the enabled state of the temperature sensor; wherein, the equivalent water temperature detection status includes a fault state and a normal state. The equivalent actual outlet water temperature of the balance water tank is determined based on the enabled state of the temperature sensor, the equivalent water temperature of the balance water tank, and the equivalent water temperature detection state. The set temperature of the terminal heating equipment is obtained, and the outdoor unit is controlled to start and stop based on the equivalent actual outlet water temperature of the balance water tank and the set temperature. The step of determining the equivalent actual outlet water temperature of the balance water tank based on the enabled state of the temperature sensor, the equivalent water temperature of the balance water tank, and the equivalent water temperature detection state includes: When both the first temperature sensor and the second temperature sensor are in an inactive state, the outlet water temperature detected by the outlet water temperature sensor of the water module is taken as the equivalent actual outlet water temperature. When the first temperature sensor or the second temperature sensor is enabled, determine whether to enter the winter antifreeze mode. If so, determine whether the equivalent water temperature detection status of the balance water tank is faulty: when the equivalent water temperature detection status of the balance water tank is faulty and the current status of the return water temperature sensor is faulty, use the outlet water temperature detected by the outlet water temperature sensor of the water module as the equivalent actual outlet water temperature; when the equivalent water temperature detection status of the balance water tank is faulty and the current status of the return water temperature sensor is normal, use the return water temperature detected by the return water temperature sensor of the water module as the equivalent actual outlet water temperature; when the equivalent water temperature detection status of the balance water tank is normal, use the equivalent water temperature of the balance water tank as the equivalent actual outlet water temperature. When the winter antifreeze mode is not activated, if the equivalent water temperature detection status of the balance water tank is faulty, the return water temperature detected by the return water temperature sensor of the water module will be used as the equivalent actual outlet water temperature; if the equivalent water temperature detection status of the balance water tank is normal, the equivalent water temperature of the balance water tank will be used as the equivalent actual outlet water temperature.

2. The control method for an air source heat pump water heater as described in claim 1, characterized in that, The step of determining the equivalent water temperature of the balance tank and the equivalent water temperature detection status based on the enabled state of the temperature sensor includes: When the first temperature sensor is enabled and the second temperature sensor is disabled, the first water temperature detected by the first temperature sensor is taken as the equivalent water temperature of the balance tank, and the current state of the first temperature sensor is taken as the equivalent water temperature detection state; wherein, the current state includes fault state and normal state. When the first temperature sensor is in the disabled state and the second temperature sensor is in the enabled state, the second water temperature detected by the second temperature sensor is taken as the equivalent water temperature of the balance tank, and the current state of the second temperature sensor is taken as the equivalent water temperature detection state. When both the first temperature sensor and the second temperature sensor are in the enabled state, the current state of the first temperature sensor and the second temperature sensor is obtained, and the equivalent water temperature and equivalent water temperature detection status of the balance water tank are determined based on the current state of the first temperature sensor and the second temperature sensor.

3. The control method for an air source heat pump water heater as described in claim 2, characterized in that, The step of determining the equivalent water temperature of the balanced water tank and the equivalent water temperature detection status based on the current states of the first temperature sensor and the second temperature sensor includes: When both the first temperature sensor and the second temperature sensor are in a fault state, the first water temperature detected by the first temperature sensor is taken as the equivalent water temperature of the balance tank, and the equivalent water temperature detection state is determined to be a fault state. When the current state of the first temperature sensor is normal and the current state of the second temperature sensor is faulty, the current state of the return water temperature sensor of the water module is obtained. If the current state of the return water temperature sensor is faulty, the first water temperature is taken as the equivalent water temperature of the balance tank, and the equivalent water temperature detection state is determined to be normal. If the current state of the return water temperature sensor is normal, the average value of the first water temperature and the return water temperature detected by the return water temperature sensor is taken as the equivalent water temperature of the balance tank, and the equivalent water temperature detection state is determined to be normal. When the current state of the first temperature sensor is faulty and the current state of the second temperature sensor is normal, the current state of the return water temperature sensor of the water module is obtained. If the current state of the return water temperature sensor is faulty, the second water temperature is used as the equivalent water temperature of the balance tank, and the equivalent water temperature detection state is determined to be normal. If the current state of the return water temperature sensor is normal, the average value of the second water temperature and the return water temperature is used as the equivalent water temperature of the balance tank, and the equivalent water temperature detection state is determined to be normal. When both the first temperature sensor and the second temperature sensor are in a normal state, the average value of the first water temperature and the second water temperature is taken as the equivalent water temperature of the balance tank, and the equivalent water temperature detection state is determined to be normal.

4. The control method for the air source heat pump water heater as described in claim 1, characterized in that, The terminal heating equipment includes underfloor heating. An underfloor heating water pump, a control valve, and an underfloor heating inlet water temperature sensor are installed on the inlet pipe between the underfloor heating system and the balance water tank. The control method for the air source heat pump water heater further includes: When only the underfloor heating is turned on and the underfloor heating inlet water temperature sensor is enabled, the underfloor heating water pump is turned on and the underfloor heating inlet water temperature detected by the underfloor heating inlet water temperature sensor is obtained. The operating mode of the control valve is switched based on the inlet water temperature and the set temperature of the underfloor heating system; wherein, the operating mode of the control valve includes a mixing mode and a heating mode.

5. The control method for an air source heat pump water heater as described in claim 4, characterized in that, A return water pipe is also connected between the underfloor heating system and the balance water tank. The step of switching the operating mode of the control valve based on the inlet water temperature and the set temperature of the underfloor heating system includes: When the inlet water temperature of the underfloor heating system is greater than the first preset temperature, the control valve is switched to the mixing mode so that the low-temperature water in the return water pipe enters the inlet water pipe; wherein, the first preset temperature is the sum of the underfloor heating system set temperature and the underfloor heating system start-up hysteresis temperature. When the inlet water temperature of the underfloor heating system is greater than or equal to the second preset temperature and less than or equal to the first preset temperature, the control valve is controlled to periodically switch between the mixing mode and the heating mode; wherein, the second preset temperature is the sum of the underfloor heating set temperature and the underfloor heating shutdown hysteresis temperature; When the temperature of the inlet water for the underfloor heating is lower than the second preset temperature, the control valve is switched to the heating mode so that the hot water in the inlet pipe enters the underfloor heating pipe.

6. The control method for an air source heat pump water heater as described in claim 3, characterized in that, The terminal heating equipment includes underfloor heating, indoor units, and heat exchange fins; the step of controlling the start-up and shutdown of the outdoor unit based on the equivalent actual outlet water temperature of the balanced water tank and the set temperature includes: When the equivalent actual outlet water temperature of the balance water tank is lower than the set temperature, the outdoor unit and the water module are controlled to start running in order to increase the equivalent actual outlet water temperature of the balance water tank. When the equivalent actual outlet water temperature of the balance water tank is greater than the set temperature, the outdoor unit and the water module are controlled to stop operating in order to reduce the equivalent actual outlet water temperature of the balance water tank.

7. A control device for an air source heat pump water heater, characterized in that, The control method according to any one of claims 1-6 is implemented, wherein the air source heat pump water heater includes an outdoor unit, multiple terminal heating devices, and a balance tank, the balance tank is disposed between the outdoor unit and the terminal heating devices, and a temperature sensor is disposed in the balance tank; the control device of the air source heat pump water heater includes: An acquisition module is used to acquire the enable state of the temperature sensor; wherein, the enable state includes an enabled state and an disabled state; The first determining module is used to determine the equivalent water temperature and equivalent water temperature detection status of the balance water tank based on the enabling state of the temperature sensor; wherein, the equivalent water temperature detection status includes a fault state and a normal state. The second determining module is used to determine the equivalent actual outlet water temperature of the balance water tank based on the enabling state of the temperature sensor, the equivalent water temperature of the balance water tank, and the equivalent water temperature detection state. The control module is used to obtain the set temperature of the terminal heating equipment and control the start and stop of the outdoor unit based on the equivalent actual outlet water temperature of the balance water tank and the set temperature.

8. An air-source heat pump water heater, characterized in that, include: The system includes an outdoor unit, a water module, multiple terminal heating devices, a balance water tank, and a controller. The balance water tank is located between the outdoor unit and the terminal heating devices. The water module is located between the outdoor unit and the balance water tank. A temperature sensor is installed in the balance water tank. The controller includes a computer-readable storage medium storing a computer program and a processor, the computer program being read and executed by the processor to implement the method as described in any one of claims 1-6.

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