Control method and equipment of heat pump water heater, medium and program product

Abstract

The invention belongs to the technical field of intelligent household appliances, and particularly relates to a control method and device of a heat pump water heater, a medium and a program product. In the shutdown state of the heat pump water heater, the environment temperature and the water temperature of the heat pump water heater are detected, and when the water temperature is smaller than or equal to a water temperature threshold value in a heat pump starting condition, the heat pump is started; the method comprises the following steps: under the condition that the heat pump is started and the environment temperature is greater than or equal to the lowest environment temperature threshold value in the heat pump starting conditions, judging whether environment temperature detection abnormity exists in a first duration before the current moment or not, under the condition that the environment temperature detection abnormity exists, controlling a fan of the heat pump water heater to start, and after the fan runs for a second duration, controlling the fan of the heat pump water heater to start; the environment temperature and the water temperature are detected again, and if the environment temperature and the water temperature meet the heat pump starting condition, a compressor of the heat pump water heater is started; by means of the method, the accuracy of environment temperature detection is improved, misjudgment and wrong starting of the compressor caused by the fact that the sensor is interfered by internal high temperature are avoided, and therefore the reliability of control over the heat pump water heater is enhanced.

Description

Technical Field

[0001] The present application relates to the field of smart home appliance technology, and in particular to a control method, device, medium and program product for a heat pump water heater. Background Art

[0002] A heat pump water heater is a highly efficient and energy-saving hot water supply device that absorbs heat energy from the air and uses a compressor and refrigerant circulation system to transfer the heat energy to the water in the water tank, thereby heating the water temperature.

[0003] In the existing technology, the heat pump water heater uses a built-in sensor to detect the ambient temperature and the water temperature in the water tank in real time. Once it is detected that the ambient temperature is within a preset temperature range and the water temperature in the water tank is lower than the target temperature set by the user minus a preset difference threshold, the control system will automatically issue a command to control the compressor of the heat pump water heater to start running.

[0004] However, the ambient temperature sensor of the integrated heat pump water heater is placed inside the machine cover. After the machine is shut down, the high water temperature in the water tank will transfer heat to the outside through the inner tank. At the same time, the high exhaust temperature of the compressor will also transfer heat to the inside of the cover. This makes the ambient temperature detected by the ambient temperature sensor higher than the actual ambient temperature, which in turn causes deviations in the machine ambient temperature detection, making it impossible for the control system to accurately determine the start-up timing of the compressor, resulting in insufficient control reliability of the heat pump water heater. Summary of the Invention

[0005] The embodiments of the present application provide a control method, device, medium, and program product for a heat pump water heater, so as to solve the problem of insufficient control reliability of the heat pump water heater.

[0006] In a first aspect, an embodiment of the present application provides a control method for a heat pump water heater, comprising:

[0007] In a shutdown state of the heat pump water heater, detecting the ambient temperature and the water temperature of the heat pump water heater, and if the water temperature is less than or equal to the water temperature threshold in the heat pump startup condition, and the ambient temperature is greater than or equal to the minimum ambient temperature threshold in the heat pump startup condition, determining whether there is an ambient temperature detection abnormality within a first time period before the current moment;

[0008] In the event of an abnormality in ambient temperature detection, the fan of the heat pump water heater is controlled to start, and after the fan has run for a second period of time, the ambient temperature and the water temperature are detected again. If the ambient temperature and the water temperature meet the heat pump start-up conditions, the compressor of the heat pump water heater is started. When the fan is started, it is used to dissipate heat for the heat pump water heater.

[0009] As an optional implementation manner, determining whether there is an abnormality in ambient temperature detection within a first period of time before the current moment includes:

[0010] Determine an amount of change in ambient temperature detected within a first time period before a current moment;

[0011] When the ambient temperature change is greater than or equal to a preset threshold, determining that an ambient temperature detection abnormality exists;

[0012] When the amount of change in the ambient temperature is less than the preset threshold, it is determined that there is no abnormality in the ambient temperature detection.

[0013] As an optional implementation manner, determining the amount of change in ambient temperature within a first period before the current moment includes:

[0014] The difference between the maximum value and the minimum value of the ambient temperature within a first time period before the current moment is determined as the ambient temperature variation.

[0015] As an optional implementation manner, after detecting the ambient temperature and the water temperature again, the method further includes:

[0016] If the ambient temperature and the water temperature do not meet the heat pump startup condition, the fan is turned off and the heat pump water heater is controlled to remain in a shutdown state.

[0017] As an optional implementation, it also includes:

[0018] In the case that there is no abnormality in the ambient temperature detection and the ambient temperature is between the minimum ambient temperature threshold and the maximum ambient temperature threshold, the compressor of the heat pump water heater is started.

[0019] As an optional implementation manner, after detecting the ambient temperature and the water temperature of the heat pump water heater, the method further includes:

[0020] If the ambient temperature is between the minimum ambient temperature threshold and the maximum ambient temperature threshold, and the water temperature is less than or equal to the water temperature threshold, then it is determined that the ambient temperature and the water temperature meet the heat pump start-up condition, and the water temperature threshold is the user-set temperature minus a preset threshold;

[0021] If the ambient temperature is not between the minimum ambient temperature threshold and the maximum ambient temperature threshold, or the water temperature is higher than the water temperature threshold, it is determined that the ambient temperature and the water temperature do not meet the heat pump startup condition.

[0022] As an optional implementation manner, before starting the compressor of the heat pump water heater, the method further includes:

[0023] Controlling the electronic expansion valve of the heat pump water heater to reset;

[0024] The opening degree of the electronic expansion valve is determined according to the ambient temperature, the water temperature and the user-set temperature, and the electronic expansion valve is controlled to open to the opening degree.

[0025] In a second aspect, an embodiment of the present application provides a control device for a heat pump water heater, comprising:

[0026] A detection module, used for detecting the ambient temperature and the water temperature of the heat pump water heater when the heat pump water heater is in a stopped state;

[0027] a judgment module, configured to judge whether there is an abnormality in the detection of the ambient temperature within a first period of time before the current moment, when the water temperature is less than or equal to the water temperature threshold in the heat pump starting condition and the ambient temperature is greater than or equal to the minimum ambient temperature threshold in the heat pump starting condition;

[0028] A control module, configured to control the fan of the heat pump water heater to start when an abnormality in the ambient temperature is detected;

[0029] The detection module is further configured to detect the ambient temperature and the water temperature again after the fan has been running for a second period of time;

[0030] The control module is further configured to start the compressor of the heat pump water heater if the ambient temperature and the water temperature meet the heat pump start-up conditions, and to dissipate heat from the heat pump water heater when the fan is started.

[0031] As an optional implementation, the control device of the heat pump water heater further includes: a determination module;

[0032] The determining module is used to determine the amount of change in the ambient temperature detected within a first time period before the current moment;

[0033] The determining module is further configured to determine that an abnormality in the ambient temperature detection exists when the ambient temperature change is greater than or equal to a preset threshold;

[0034] The determining module is further configured to determine that there is no abnormality in the ambient temperature detection when the ambient temperature change is less than the preset threshold.

[0035] As an optional implementation manner, the determining module is further configured to determine the difference between the maximum value and the minimum value of the ambient temperature within a first time period before the current moment as the ambient temperature variation.

[0036] As an optional implementation, the control module is further configured to turn off the fan and control the heat pump water heater to remain in a shutdown state if the ambient temperature and the water temperature do not meet the heat pump startup conditions.

[0037] As an optional implementation, the control module is further configured to start the compressor of the heat pump water heater when there is no abnormality in the ambient temperature detection and the ambient temperature is between the minimum ambient temperature threshold and the maximum ambient temperature threshold.

[0038] As an optional implementation manner, the determining module is further configured to determine that the ambient temperature and the water temperature meet the heat pump startup condition if the ambient temperature is between the minimum ambient temperature threshold and the maximum ambient temperature threshold, and the water temperature is less than or equal to the water temperature threshold, where the water temperature threshold is the user-set temperature minus a preset threshold;

[0039] The determination module is further configured to determine that the ambient temperature and the water temperature do not satisfy the heat pump startup condition if the ambient temperature is not between the minimum ambient temperature threshold and the maximum ambient temperature threshold, or if the water temperature is higher than the water temperature threshold.

[0040] As an optional implementation, the control module is further used to control the electronic expansion valve of the heat pump water heater to reset;

[0041] The determining module is further configured to determine the opening of the electronic expansion valve according to the ambient temperature, the water temperature, and the user-set temperature;

[0042] The control module is further configured to control the electronic expansion valve to open to the opening degree.

[0043] In a third aspect, an embodiment of the present application provides a control device for a heat pump water heater, comprising: a sensor, a receiver, a transmitter, a memory, and a processor;

[0044] Sensors for detecting ambient temperature and water temperature;

[0045] A receiver, for receiving instructions and data;

[0046] Transmitter, used to send instructions and data;

[0047] The memory stores computer-executable instructions;

[0048] The processor executes the computer-executable instructions stored in the memory, so that the processor executes the above first aspect and / or various possible implementations of the first aspect.

[0049] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, in which computer-executable instructions are stored. When the computer-executable instructions are executed by a processor, they are used to implement the above first aspect and / or various possible implementations of the first aspect.

[0050] In a fifth aspect, an embodiment of the present application provides a computer program product, including a computer program, which, when executed by a processor, implements the above first aspect and / or various possible implementation methods of the first aspect.

[0051] The control method of the heat pump water heater provided in the present application detects the ambient temperature and the water temperature of the heat pump water heater when the heat pump water heater is in the shutdown state. When the water temperature is less than or equal to the water temperature threshold in the heat pump start-up condition, and the ambient temperature is greater than or equal to the minimum ambient temperature threshold in the heat pump start-up condition, it is determined whether there is an ambient temperature detection abnormality within a first period of time before the current moment. When there is an ambient temperature detection abnormality, the fan of the heat pump water heater is controlled to start, and after the fan has run for a second period of time, the ambient temperature and water temperature are detected again. If the ambient temperature and water temperature meet the heat pump start-up condition, the compressor of the heat pump water heater is started, and the fan is started to dissipate heat for the heat pump water heater. This method improves the accuracy of ambient temperature detection, avoids misjudgment and incorrect start-up of the compressor due to internal high temperature interference of the sensor, thereby enhancing the reliability of heat pump water heater control. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0053] Figure 1 A flow chart of a control method for a heat pump water heater provided in this application;

[0054] Figure 2 A schematic diagram of the structure of the control device of the heat pump water heater provided in this application;

[0055] Figure 3 This is a schematic diagram of the structure of the control device of the heat pump water heater provided in this application.

[0056] The above drawings illustrate specific embodiments of the present application, which will be described in more detail below. These drawings and the textual description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0057] To make the objectives, technical solutions, and advantages of this application more clear, the technical solutions in this application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0058] Heat pump water heaters are highly efficient and energy-efficient hot water supply devices widely used in homes and commercial spaces. They heat water by absorbing heat from the air and transferring it to the water in a tank through a compressor and refrigerant circulation system.

[0059] Conventional heat pump water heaters typically feature built-in sensors that monitor the ambient temperature and the water temperature inside the water tank in real time. When the ambient temperature is detected to be within a preset optimum range and the water temperature inside the water tank is below the user-set target temperature minus a preset threshold, the control system automatically activates the compressor to maintain a stable hot water supply and energy savings.

[0060] However, in integrated heat pump water heater designs, the ambient temperature sensor is typically installed inside the machine's housing. When the unit is shut down, the hot water stored in the water tank dissipates heat through the inner tank. Simultaneously, the hot exhaust gas generated by the compressor during operation also conducts heat into the housing, causing the internal temperature to rise. This causes the ambient temperature measured by the ambient temperature sensor to be higher than the actual external ambient temperature, causing the control system to misjudge the ambient temperature, affecting the compressor's startup decision and resulting in insufficient reliability in the heat pump water heater's control.

[0061] In response to the above problems, the control method of the heat pump water heater provided by the present application, when the heat pump water heater is in the shutdown state, first detects whether the water temperature and the ambient temperature meet the conditions that the water temperature is less than or equal to the water temperature threshold in the heat pump startup condition, and the ambient temperature is greater than or equal to the minimum ambient temperature threshold in the heat pump startup condition; if they meet the conditions, then further determine whether there is abnormal fluctuation in ambient temperature detection within a period of time before the current moment to identify temperature detection deviations that may be caused by internal heat accumulation; when it is confirmed that there is an abnormal ambient temperature detection, first start the fan for forced heat dissipation, and reduce the impact of the internal temperature of the housing on the sensor through a certain period of air cooling; after the fan operation ends, detect the ambient temperature and water temperature again. If the startup conditions are still met, it is determined that the external environment actually meets the startup conditions, and then start the compressor. This method improves the accuracy of ambient temperature detection, avoids misjudgment and incorrect startup of the compressor caused by internal high temperature interference on the sensor, thereby enhancing the reliability of heat pump water heater control.

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

[0063] Figure 1 This is a flow chart of the control method of the heat pump water heater provided in this application. The execution subject of this embodiment is, for example, a control system. Figure 1 As shown, the method includes:

[0064] S101: When the heat pump water heater is in shutdown state, the ambient temperature and the water temperature of the heat pump water heater are detected. When the water temperature is less than or equal to the water temperature threshold in the heat pump start-up condition, and the ambient temperature is greater than or equal to the minimum ambient temperature threshold in the heat pump start-up condition, determine whether there is an ambient temperature detection abnormality within the first time period before the current moment.

[0065] In the operational control logic of heat pump water heaters, monitoring ambient and water temperatures during shutdown is crucial for ensuring efficient and safe operation. Heat pump water heaters typically enter shutdown mode under specific conditions, such as when the water temperature in the tank reaches the set point or when no heating request is made by the user. However, during shutdown, the control system must continuously monitor the ambient temperature and the water temperature inside the tank. Once the ambient temperature and the current water temperature meet certain conditions, the heat pump may be ready to restart heating.

[0066] If the ambient temperature is detected to be at the minimum ambient temperature threshold at which the heat pump can operate effectively, and the water temperature in the water tank has dropped below the preset starting temperature (i.e., the water temperature threshold), the heat pump will enter the trial operation stage.

[0067] If the water temperature is less than or equal to the water temperature threshold in the heat pump startup conditions, and the ambient temperature is greater than or equal to the minimum ambient temperature threshold in the heat pump startup conditions, the control system must further analyze the changes in the ambient temperature detection value within a certain period of time before the current moment (i.e., the first period) to determine whether there is an ambient temperature detection anomaly. The purpose of this judgment is to prevent the heat pump from erroneously starting due to inconsistencies between the ambient temperature measurement value and the actual temperature, or non-sustained temperature changes within a short period of time (such as measurement errors, temporary interference, etc.).

[0068] S102: In the event of an abnormality in the ambient temperature detection, the fan of the heat pump water heater is controlled to start, and after the fan has run for a second period of time, the ambient temperature and water temperature are detected again. If the ambient temperature and water temperature meet the heat pump start-up conditions, the compressor of the heat pump water heater is started. When the fan is started, it is used to dissipate heat from the heat pump water heater.

[0069] In an integrated heat pump water heater, when the control system detects an abnormality in the current ambient temperature, it's usually because the ambient temperature sensor, located inside the machine's housing, is affected by the high temperature conducted from the water tank and residual heat in the compressor exhaust area after the unit shuts down, causing the local ambient temperature of the sensor to exceed the actual external temperature. This heat accumulation distorts the data collected by the sensor, affecting the heat pump system's understanding of the actual ambient conditions and potentially leading to erroneous startup control behavior.

[0070] If the water temperature is less than or equal to the water temperature threshold in the heat pump startup conditions, and the ambient temperature is greater than or equal to the minimum ambient temperature threshold in the heat pump startup conditions, but there is an ambient temperature abnormality, the compressor will not be started immediately. Instead, the fan will be started and run for a period of time (i.e., the second duration). The fan operation can effectively disturb the air flow inside the housing, accelerate heat dissipation, and reduce the temperature in the sensor area, bringing it closer to the actual ambient temperature.

[0071] After the fan has run for the second period of time, the control system detects the ambient temperature and water temperature again. If the ambient temperature measured at this time meets the heat pump start-up conditions, it is determined that the premise for starting the compressor safely and efficiently is met. The control system will then officially start the compressor and put the heat pump into heating operation.

[0072] This control logic effectively avoids misjudgment problems caused by design limitations of sensor location, improves the accuracy and stability of the control system's judgment, ensures the reliable operation of the heat pump water heater in different usage environments, and also helps to extend equipment life and improve overall energy efficiency.

[0073] The control method of the heat pump water heater provided in the embodiment of the present application detects the ambient temperature and the water temperature of the heat pump water heater when the heat pump water heater is in the shutdown state. When the water temperature is less than or equal to the water temperature threshold in the heat pump start-up condition, and the ambient temperature is greater than or equal to the minimum ambient temperature threshold in the heat pump start-up condition, it is determined whether there is an ambient temperature detection abnormality within a first period of time before the current moment. When there is an ambient temperature detection abnormality, the fan of the heat pump water heater is controlled to start, and after the fan has run for a second period of time, the ambient temperature and water temperature are detected again. If the ambient temperature and water temperature meet the heat pump start-up condition, the compressor of the heat pump water heater is started, and the fan is started to dissipate heat for the heat pump water heater. This method improves the accuracy of ambient temperature detection, avoids misjudgment and incorrect start-up of the compressor due to internal high temperature interference of the sensor, thereby enhancing the reliability of heat pump water heater control.

[0074] As an optional implementation, a specific method for determining whether there is an abnormality in ambient temperature detection within a first period before the current moment includes:

[0075] Determine an amount of change in ambient temperature detected within a first time period before a current moment;

[0076] When the ambient temperature change is greater than or equal to a preset threshold, determining that there is an ambient temperature detection abnormality;

[0077] When the amount of change in the ambient temperature is less than the preset threshold, it is determined that there is no abnormality in the ambient temperature detection.

[0078] This process determines whether a heat pump water heater's ambient temperature detection is abnormal within a specific time period (the first time period before the current moment). The process calculates the change in ambient temperature during this time period and compares it with a preset threshold to determine whether the ambient temperature detection status is normal. The ambient temperature here is measured by a temperature sensor, but due to the sensor's location and internal heat generation, the measured value may deviate from the actual ambient temperature.

[0079] Because the ambient temperature sensor is located inside the machine's housing, after the equipment shuts down, it will be affected by the high temperature conducted from the water tank's inner liner and the residual heat in the compressor exhaust area, causing the local ambient temperature of the sensor to be higher than the actual external ambient temperature. This causes the measured ambient temperature to fluctuate significantly due to these external factors within the first period of time, while the actual ambient temperature typically does not change much within the same period of time. Without making such a judgment, controlling the operation of the heat pump water heater based on distorted measurement data may cause problems such as false starts and frequent starts and stops, which not only affects the operating efficiency and stability of the equipment, but also shortens the equipment life and increases energy consumption. Therefore, by calculating the ambient temperature change and comparing it with the preset threshold, abnormal ambient temperature detection can be accurately identified to ensure the normal operation of the heat pump water heater.

[0080] As an optional implementation, a specific method for determining the amount of change in ambient temperature within a first period before the current moment includes:

[0081] The difference between the maximum value and the minimum value of the ambient temperature within a first time period before the current moment is determined as the ambient temperature variation.

[0082] During the operation of the heat pump water heater, determining the change in ambient temperature within the first time period before the current moment refers to: the difference between the maximum and minimum values that the ambient temperature can reach within the specific time period of the first time period before the current moment.

[0083] Because the operating efficiency and startup timing of heat pump water heaters are closely related to ambient temperature, and the ambient temperature sensor is affected by its installation location and internal heat, the measured ambient temperature may deviate from the actual value. By calculating the ambient temperature change, we can more accurately grasp the dynamic changes in ambient temperature. If the change is too large, it may indicate that the sensor is interfering, resulting in distorted measurement data. If the heat pump operation is controlled directly based on this data without judgment, it may cause problems such as false starts and frequent starts and stops, affecting the performance and life of the equipment.

[0084] Taking an integrated heat pump water heater as an example, assuming that the preset first duration is 1 hour and the preset threshold is set to 10°C, after the heat pump water heater is shut down, the ambient temperature is continuously measured by the ambient temperature sensor located inside the machine cover, and the temperature data within 1 hour before the current moment is recorded. It is calculated that the maximum value of the measured ambient temperature within this hour is 40°C and the minimum value is 28°C. The difference between the two is 12°C. Since 12°C is greater than the preset threshold of 10°C, it can be determined that there is an abnormality in the ambient temperature detection within 1 hour before the current moment. This is because the sensor is affected by the high temperature conducted by the water tank and Residual heat interference in the compressor exhaust area causes the measured ambient temperature to change too much, while the actual ambient temperature usually does not change that much within this hour; if in another hour, the maximum measured ambient temperature is 30°C and the minimum is 24°C, and the ambient temperature change is 6°C, which is less than the preset threshold of 10°C, then it can be determined that there is no ambient temperature detection abnormality within this hour. By calculating the ambient temperature change and comparing it with the preset threshold, ambient temperature detection abnormalities can be effectively identified, avoiding problems such as false startup and frequent start-stop of the heat pump water heater due to distorted measurement data, and ensuring its normal operation.

[0085] As an optional implementation, after detecting the ambient temperature and the water temperature again, the method further includes:

[0086] If the ambient temperature and water temperature do not meet the heat pump startup conditions, the fan will be turned off and the heat pump water heater will be controlled to remain in the shutdown state.

[0087] After completing the retest of the ambient temperature and water temperature, if the test results show that both the ambient temperature and the water temperature do not meet the heat pump start-up conditions, the heat pump system will perform subsequent actions, namely turning off the fan and keeping the heat pump water heater in the shutdown state.

[0088] Heat pump water heaters require suitable ambient and water temperatures to start. Forcing them to start when these temperatures are below standard will not only prevent efficient heating, but may also damage the unit. For example, starting a heat pump when the ambient temperature is too low can damage the compressor due to excessive load. Starting a heat pump when the water temperature is too high or too low can also affect the heat pump's heating efficiency and lifespan. Turning off the fan and keeping it in a stopped state effectively prevents the unit from operating under inappropriate conditions, reducing unnecessary energy consumption and wear, and ensuring the stability and safety of the heat pump water heater.

[0089] During actual operation, after retesting the ambient and water temperatures, the control system automatically compares and analyzes the test data with the preset heat pump startup conditions. If the ambient temperature is higher than the maximum temperature threshold required for startup, or the water temperature is higher than the set startup range, the control system will determine that the ambient and water temperatures do not meet the startup conditions. At this point, the control system will send a shutdown command to the fan, causing it to stop operating. At the same time, the control system will maintain the heat pump water heater in a shutdown state and will not send startup signals to key components such as the compressor. This ensures that the equipment does not operate in an unsuitable environment, and will wait until the ambient and water temperatures reach the appropriate conditions before re-judging and re-operating.

[0090] As an optional implementation, the method further includes: starting the compressor of the heat pump water heater when there is no abnormality in the ambient temperature detection and the ambient temperature is between the minimum ambient temperature threshold and the maximum ambient temperature threshold.

[0091] During heat pump water heater operation, ambient temperature accuracy is crucial for the stable startup and efficient operation of the control system. When the control system detects and determines that there are no ambient temperature anomalies, it enters the preparation phase for compressor startup. This means that, during the first period preceding the current moment, by calculating the ambient temperature change and comparing it with a preset threshold, no measurement distortion due to sensor interference has been detected. At this point, the control system can conclude that the current ambient temperature data accurately reflects the external environment, providing a reliable basis for safe compressor startup.

[0092] After confirming that there is no abnormality in the ambient temperature detection, since the time interval between the water temperature detection time and the judgment that there is no abnormality in this ambient temperature detection is extremely short, it can be reasonably inferred that the water temperature status has not changed significantly in this short period of time. Therefore, there is no need to detect the water temperature separately again, but directly determine whether the ambient temperature and water temperature both meet the starting conditions; if the ambient temperature and water temperature both meet the starting conditions, the control system will immediately send a start command to the compressor. As the core driving component of the heat pump water heater, the compressor will activate the entire refrigeration cycle system when it is started, prompting the heat pump system to efficiently absorb heat from the surrounding environment, and accurately transfer the heat to the water in the water tank through circulation, so as to gradually increase the water temperature and ultimately achieve the purpose of providing hot water to users.

[0093] As an optional implementation, after detecting the ambient temperature and the water temperature of the heat pump water heater, the method further includes:

[0094] If the ambient temperature is between the minimum ambient temperature threshold and the maximum ambient temperature threshold, and the water temperature is less than or equal to the water temperature threshold, it is determined that the ambient temperature and the water temperature meet the heat pump start-up conditions, and the water temperature threshold is the user-set temperature minus the preset threshold;

[0095] If the ambient temperature is not between the minimum ambient temperature threshold and the maximum ambient temperature threshold, or the water temperature is higher than the water temperature threshold, it is determined that the ambient temperature and the water temperature do not meet the heat pump start-up condition.

[0096] In the operational control logic of heat pump water heaters, ambient temperature and water temperature are key factors in determining whether the compressor can start. When the system detects and analyzes these temperatures, it follows specific rules for determining startup conditions. Both temperatures must meet specific requirements to confirm that the heat pump is properly started.

[0097] A heat pump system can only operate stably and efficiently when the ambient temperature falls within the preset range. For example, in extremely low temperatures, the heat pump's heating efficiency will drop significantly, and it may even fail to function properly. In extremely high temperatures, however, internal components may be damaged, shortening the lifespan of the system. Therefore, maintaining an ambient temperature within the preset range is essential for ensuring stable and efficient heat pump operation.

[0098] The water temperature must be lower than the user-set temperature minus the preset threshold, which is also a necessary condition for the heat pump to start. The user-set temperature represents the temperature value that the user expects the water in the water tank to reach, while the preset threshold is a buffer value set to take into account factors such as time delays and temperature fluctuations during the heat pump heating process. When the actual water temperature is lower than this calculated value, it means that the water in the water tank has not yet reached the temperature required by the user, and there is a certain gap between it and the target temperature, and further heating is required through the operation of the heat pump. If the water temperature is close to or reaches the user-set temperature, starting the heat pump at this time is not only meaningless, but may also cause energy waste and frequent starting and stopping of the equipment, affecting the service life and operational stability of the equipment.

[0099] When the ambient temperature is within the preset range and the water temperature is lower than the user-set temperature minus the preset threshold, the control system determines that both the ambient and water temperatures meet the heat pump startup requirements. The control system then sends a startup command to the compressor and other related components, causing the heat pump water heater to begin operating. It absorbs heat from the environment and transfers it to the water in the tank, gradually raising the water temperature to meet the user's hot water needs. This dual-condition startup control method effectively improves the heat pump water heater's operating efficiency, stability, and energy efficiency, providing users with a more reliable and comfortable hot water experience.

[0100] For example, the preset ambient temperature range is -15℃ to 43℃, the user sets the water tank temperature to 50℃, and the preset threshold is 5℃. When the control system detects that the current ambient temperature is 25℃, which is within the preset temperature range of -15℃ to 43℃, and at the same time detects that the water temperature in the water tank is 42℃, which is lower than the user-set temperature of 50℃ minus the preset threshold of 5℃ (i.e. 45℃), the ambient temperature and water temperature conditions are met at the same time. The control system will determine that the ambient temperature and water temperature meet the heat pump start-up conditions, and then send a start instruction to the compressor and other related components to start the heat pump water heater, absorbing heat from the environment and transferring it to the water in the water tank, gradually raising the water temperature to meet the user's demand for 50℃ hot water. This start-up control method based on the dual conditions of ambient temperature and water temperature can effectively improve the operating efficiency, stability and energy efficiency of the heat pump water heater, bringing users a more reliable and comfortable hot water experience.

[0101] If the ambient temperature is not within the preset temperature range, it means that the current environment is not conducive to the efficient and stable operation of the heat pump system. The preset temperature range is determined after comprehensively considering factors such as heat pump performance, energy efficiency ratio, and equipment safety. When the ambient temperature is too low, it becomes more difficult for the heat pump to absorb heat from the outside world, and the heating efficiency will be significantly reduced. This may cause the compressor to run at high load for a long time, increasing the risk of equipment damage, and may not heat the water temperature to the temperature required by the user; when the ambient temperature is too high, it may affect the heat dissipation effect of the heat pump system, resulting in abnormal pressure in the heat pump system, which is also not conducive to the normal operation and life guarantee of the equipment. Therefore, the deviation of the ambient temperature from the preset range is one of the important factors in determining that the startup conditions are not met.

[0102] When the water temperature is higher than the user-set temperature minus the preset threshold, it means that the water in the water tank has approached or reached the user's desired temperature. The preset threshold is a buffer value set to avoid frequent starting and stopping of the heat pump and to account for factors such as temperature measurement errors. In this case, continuing to start the heat pump will not only fail to effectively raise the water temperature to meet the user's higher needs, but will also result in energy waste. Because the heat pump consumes electricity to operate, continuing to heat the water at this time will not substantially help improve the user's actual usage experience, but will instead increase operating costs and equipment wear. Therefore, water temperatures outside this range are judged to not meet the startup conditions.

[0103] Once the ambient temperature is determined to be outside the preset range, or the water temperature is higher than the user-set temperature minus the preset threshold, the control system will determine that the ambient and water temperatures do not meet the heat pump startup conditions. At this point, the control system will not send startup commands to key components such as the compressor, and the heat pump water heater will remain in a shutdown state, waiting for the ambient and water temperatures to return to the appropriate range before re-evaluating and re-operating, thus ensuring safe, efficient, and energy-saving operation of the heat pump water heater.

[0104] For example, the preset ambient temperature range is -15°C to 35°C, the user sets the water tank temperature to 50°C, and the preset threshold is 5°C; if the control system detects that the current ambient temperature is -20°C, which is lower than the lower limit of the preset temperature range of -15°C, the ambient temperature is not within the preset temperature range, indicating that the current low temperature environment is not conducive to the efficient and stable operation of the heat pump, and the heat pump heating efficiency will be greatly reduced, and the risk of equipment damage may increase, and it may not be able to meet the user's water demand; or the water temperature in the water tank is detected to be 53°C, which is higher than the user-set temperature of 50°C minus the preset threshold of 5°C (i.e. 45°C). The calculated value indicates that the water in the water tank is close to the user's expected temperature. Continuing to start the heat pump will not only make it difficult to effectively increase the water temperature, but will also cause energy waste and equipment wear. Therefore, whether the ambient temperature is not within the preset temperature range or the water temperature is higher than the user-set temperature minus the preset threshold, the control system will determine that the ambient temperature and water temperature do not meet the heat pump start-up conditions, and will not send start-up instructions to key components such as the compressor. The heat pump water heater will remain in a stopped state and wait for the ambient temperature and water temperature to return to the appropriate range before re-judging the operation to ensure the safe, efficient and energy-saving operation of the heat pump water heater.

[0105] As an optional embodiment, before starting the compressor of the heat pump water heater, the method further includes:

[0106] Control the reset of the electronic expansion valve of the heat pump water heater;

[0107] The opening degree of the electronic expansion valve is determined according to the ambient temperature, water temperature and user set temperature, and the electronic expansion valve is controlled to open to the opening degree.

[0108] Before starting the heat pump water heater's compressor, precise control of the electronic expansion valve is a critical step in ensuring stable and efficient operation of the heat pump system. As a crucial component in the heat pump system, the opening of the electronic expansion valve directly affects the refrigerant flow rate and the heat pump system's operating status. Therefore, before starting the compressor, the electronic expansion valve must be reset to its initial, precisely controllable state. This reset eliminates any abnormalities or positional deviations in the electronic expansion valve, ensuring accurate operation according to the control system's instructions and ensuring the proper operation of the heat pump system.

[0109] After the electronic expansion valve is reset, its opening is determined based on three key parameters: ambient temperature, water temperature, and the user-set temperature. The ambient temperature reflects how easily the heat pump system absorbs heat from the outside world, the water temperature indicates the current hot or cold state of the water in the tank, and the user-set temperature represents the user's specific desired hot water temperature. The control system comprehensively considers these three factors, using built-in algorithms and logic to calculate the optimal opening of the electronic expansion valve. For example, when the ambient temperature is low, the opening of the electronic expansion valve may need to be increased to ensure sufficient heat absorption from the heat pump, thereby increasing the refrigerant flow rate. Conversely, when the water temperature approaches the user-set temperature, the opening of the electronic expansion valve may need to be decreased to reduce the refrigerant flow rate to prevent overheating or overshoot. This multi-parameter-based opening determination logic ensures efficient and stable operation of the heat pump system under various operating conditions.

[0110] After determining the opening of the electronic expansion valve, the control system sends the corresponding control instructions to the electronic expansion valve, causing it to open to the calculated opening. This process ensures that the electronic expansion valve opening is adjusted accurately and quickly to meet the operating requirements of the compressor that is about to start. Once the electronic expansion valve is adjusted to the appropriate opening, the compressor can start safely and stably. At this point, the heat pump system enters normal operation. Under the regulation of the electronic expansion valve, the refrigerant circulates through the system at a predetermined flow rate and pressure, absorbing heat from the environment and transferring it to the water in the tank, thereby heating the water. The coordinated coordination of electronic expansion valve opening control and compressor startup fully utilizes the performance of the heat pump system, improves energy efficiency, and provides users with a stable and reliable hot water supply.

[0111] For example, before starting its compressor, the control system will first send an instruction to control the electronic expansion valve to reset, so that the electronic expansion valve returns to the initial, precisely adjustable reference position and eliminates possible state deviations; then, the control system will obtain the current ambient temperature of 8°C (the ambient temperature is low at this time, and it is more difficult for the heat pump to absorb heat from the outside), the water temperature in the water tank is 30°C, and the target water temperature set by the user is 50°C. Through the built-in algorithm, it is calculated that the opening of the electronic expansion valve suitable for the current working conditions is 300 steps (the opening units and calculation methods of different heat pump systems are different). Finally, the control system sends a control signal to the electronic expansion valve to make it accurately open to an opening of 300 steps, preparing for the subsequent stable operation of the compressor and efficient heating of the heat pump system.

[0112] Figure 2 This is a schematic diagram of the structure of the control device of the heat pump water heater provided in this application, such as Figure 2 As shown, the control device 200 of the heat pump water heater provided in this embodiment includes:

[0113] The detection module 201 is used to detect the ambient temperature and the water temperature of the heat pump water heater when the heat pump water heater is in a stopped state;

[0114] The judgment module 202 is configured to determine whether there is an abnormality in the ambient temperature detection within a first period of time before the current moment when the water temperature is less than or equal to the water temperature threshold in the heat pump startup condition and the ambient temperature is greater than or equal to the minimum ambient temperature threshold in the heat pump startup condition;

[0115] The control module 203 is used to control the fan of the heat pump water heater to start when there is an abnormality in the ambient temperature detection;

[0116] The detection module 201 is further configured to detect the ambient temperature and the water temperature again after the fan has been running for a second period of time;

[0117] The control module 203 is further configured to start the compressor of the heat pump water heater if the ambient temperature and the water temperature meet the heat pump start-up conditions, and to dissipate heat from the heat pump water heater when the fan is started.

[0118] As an optional implementation, the control device of the heat pump water heater further includes: a determination module 204;

[0119] A determination module 204 is configured to determine an amount of change in the ambient temperature detected within a first time period before the current moment;

[0120] The determination module 204 is further configured to determine that an abnormality in the ambient temperature detection exists when the ambient temperature change is greater than or equal to a preset threshold;

[0121] The determination module 204 is further configured to determine that there is no abnormality in the ambient temperature detection when the ambient temperature change is less than a preset threshold.

[0122] As an optional implementation, the determination module 204 is further configured to determine the difference between the maximum value and the minimum value of the ambient temperature within a first time period before the current moment as the ambient temperature variation.

[0123] As an optional implementation, the control module 203 is further configured to turn off the fan and control the heat pump water heater to remain in a shutdown state if the ambient temperature and the water temperature do not meet the heat pump startup conditions.

[0124] As an optional implementation, the control module 203 is further configured to start the compressor of the heat pump water heater when there is no abnormality in the ambient temperature detection and the ambient temperature is between the minimum ambient temperature threshold and the maximum ambient temperature threshold.

[0125] As an optional embodiment, the determination module 204 is further configured to determine that the ambient temperature and the water temperature meet the heat pump start-up condition if the ambient temperature is between a minimum ambient temperature threshold and a maximum ambient temperature threshold, and the water temperature is less than or equal to the water temperature threshold, where the water temperature threshold is the user-set temperature minus a preset threshold;

[0126] The determination module 204 is further configured to determine that the ambient temperature and the water temperature do not meet the heat pump startup condition if the ambient temperature is not between the minimum ambient temperature threshold and the maximum ambient temperature threshold, or the water temperature is higher than the water temperature threshold.

[0127] As an optional implementation, the control module 203 is further configured to control the electronic expansion valve of the heat pump water heater to reset;

[0128] The determination module 204 is further configured to determine the opening of the electronic expansion valve according to the ambient temperature, the water temperature, and the user-set temperature;

[0129] The control module 203 is further configured to control the electronic expansion valve to open to a certain opening degree.

[0130] Figure 3 This is a schematic diagram of the structure of the control device of the heat pump water heater provided in this application. Figure 3 As shown, the present application provides a control device for a heat pump water heater. The control device 300 of the heat pump water heater includes: a sensor 301 , a receiver 302 , a transmitter 303 , a processor 304 and a memory 305 .

[0131] Sensor 301, for detecting ambient temperature and water temperature;

[0132] Receiver 302, for receiving instructions and data;

[0133] Transmitter 303, used to send instructions and data;

[0134] Memory 305, for storing computer-executable instructions;

[0135] The processor 304 is configured to execute the computer-executable instructions stored in the memory 305 to implement the various steps of the control method for the heat pump water heater in the above embodiment. For details, please refer to the relevant description in the above embodiment of the control method for the heat pump water heater.

[0136] Optionally, the memory 305 may be independent or integrated with the processor 304 .

[0137] When the memory 305 is independently provided, the electronic device further includes a bus for connecting the memory 305 and the processor 304 .

[0138] The present application also provides a computer-readable storage medium, in which computer-executable instructions are stored. When a processor executes the computer-executable instructions, a control method for a heat pump water heater as performed by the control device of the heat pump water heater described above is implemented.

[0139] Those skilled in the art will appreciate that all or some of the steps, systems, and functional modules / units in the methods, systems, and devices disclosed above may be implemented as software, firmware, hardware, or any combination thereof. In hardware implementations, the division between functional modules / units described above does not necessarily correspond to the division between physical components; for example, a physical component may have multiple functions, or a function or step may be performed collaboratively by several physical components. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software may be distributed on computer-readable media, which may include computer storage media (or non-transitory media) and communication media (or transient media). As is well known to those skilled in the art, the term computer storage media encompasses both volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information, such as computer-readable instructions, data structures, program modules, or other data. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store the desired information and can be accessed by a computer. In addition, as is well known to those skilled in the art, communication media typically embodies computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0140] So far, the technical solution of the present application has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the scope of protection of the present application is obviously not limited to these specific embodiments. The above embodiments are only used to illustrate the technical solution of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solution to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A control method for a heat pump water heater, characterized in that: include: In a shutdown state of the heat pump water heater, detecting the ambient temperature and the water temperature of the heat pump water heater, and if the water temperature is less than or equal to the water temperature threshold in the heat pump startup condition, and the ambient temperature is greater than or equal to the minimum ambient temperature threshold in the heat pump startup condition, determining whether there is an ambient temperature detection abnormality within a first time period before the current moment; In the event of an abnormality in ambient temperature detection, the fan of the heat pump water heater is controlled to start, and after the fan has run for a second period of time, the ambient temperature and the water temperature are detected again. If the ambient temperature and the water temperature meet the heat pump start-up conditions, the compressor of the heat pump water heater is started. When the fan is started, it is used to dissipate heat for the heat pump water heater.

2. The method according to claim 1, characterized in that The determining whether there is an abnormality in the ambient temperature detection within a first period before the current moment includes: Determine an amount of change in ambient temperature detected within a first time period before a current moment; When the ambient temperature change is greater than or equal to a preset threshold, determining that an ambient temperature detection abnormality exists; When the amount of change in the ambient temperature is less than the preset threshold, it is determined that there is no abnormality in the ambient temperature detection.

3. The method according to claim 2, characterized in that The determining of the change in ambient temperature within a first time period before the current moment includes: The difference between the maximum value and the minimum value of the ambient temperature within a first time period before the current moment is determined as the ambient temperature variation.

4. The method according to any one of claims 1 to 3, characterized in that After detecting the ambient temperature and the water temperature again, the method further includes: If the ambient temperature and the water temperature do not meet the heat pump startup condition, the fan is turned off and the heat pump water heater is controlled to remain in a shutdown state.

5. The method according to any one of claims 1 to 3, characterized in that Also includes: In the case that there is no abnormality in the ambient temperature detection and the ambient temperature is between the minimum ambient temperature threshold and the maximum ambient temperature threshold, the compressor of the heat pump water heater is started.

6. The method according to any one of claims 1 to 3, characterized in that After detecting the ambient temperature and the water temperature of the heat pump water heater, the method further includes: If the ambient temperature is between the minimum ambient temperature threshold and the maximum ambient temperature threshold, and the water temperature is less than or equal to the water temperature threshold, then it is determined that the ambient temperature and the water temperature meet the heat pump start-up condition, and the water temperature threshold is the user-set temperature minus a preset threshold; If the ambient temperature is not between the minimum ambient temperature threshold and the maximum ambient temperature threshold, or the water temperature is higher than the water temperature threshold, it is determined that the ambient temperature and the water temperature do not meet the heat pump startup condition.

7. The method according to any one of claims 1 to 3, characterized in that Before starting the compressor of the heat pump water heater, the method further includes: Controlling the electronic expansion valve of the heat pump water heater to reset; The opening degree of the electronic expansion valve is determined according to the ambient temperature, the water temperature and the user-set temperature, and the electronic expansion valve is controlled to open to the opening degree.

8. A control device for a heat pump water heater, characterized in that: include: A detection module, used for detecting the ambient temperature and the water temperature of the heat pump water heater when the heat pump water heater is in a stopped state; a judgment module, configured to judge whether there is an abnormality in the detection of the ambient temperature within a first time period before the current moment, if the ambient temperature and the water temperature meet the heat pump startup condition; A control module, configured to control the fan of the heat pump water heater to start when an abnormality in the ambient temperature is detected; The detection module is further configured to detect the ambient temperature and the water temperature again after the fan has been running for a second period of time; The control module is further configured to start the compressor of the heat pump water heater if the ambient temperature and the water temperature meet a heat pump start-up condition.

9. A control device for a heat pump water heater, characterized in that: include: Sensors, memory, processors; The sensor is used to detect ambient temperature and water temperature; The memory stores computer-executable instructions; The processor executes the computer-executable instructions stored in the memory, so that the processor performs the method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer-executable instructions, which are used to implement the method according to any one of claims 1 to 7 when executed by a processor.

Images