Fault detection method for temperature sensing bulb of air energy water heater, air energy water heater and medium

Abstract

The invention provides a fault detection method for a temperature sensing bulb of an air energy water heater, the air energy water heater and a medium. According to the method, under the condition that it is detected that the shutdown duration of a compressor in the air energy water heater meets the preset duration, the temperature values collected by a plurality of temperature sensing bulbs in the air energy water heater are obtained, the temperature values are sequenced, and the maximum temperature value and the minimum temperature value are obtained through screening; and determining the temperature sensing bulb with the temperature offset fault by carrying out abnormity judgment on the maximum temperature value and the minimum temperature value. According to the invention, the system can identify the temperature deviation fault of the temperature sensing bulb in a non-operation state, early warning is carried out in time, the fault temperature sensing bulb is positioned, and the technical effect of improving the reliability and maintenance efficiency of the system is achieved.

Description

Technical Field

[0001] This disclosure relates to the technical field of controlling household appliances, and in particular to a fault detection method for the temperature sensing element of an air source water heater, an air source water heater, and a medium. Background Technology

[0002] Air source heat pump water heaters are worry-free, all-weather, energy-saving, and environmentally friendly hot water devices. Their operation relies on multiple temperature sensors (i.e., temperature sensors) to monitor the temperature of key system components in real time. During actual operation, these temperature sensors may experience problems such as open circuits, short circuits, temperature deviations, poor contact, or aging failure, leading to system misjudgments or abnormal operation, affecting hot water supply efficiency and equipment safety.

[0003] Currently, existing technologies generally employ real-time monitoring of the temperature sensor during system operation. For example, if the temperature sensor temperature is detected to be extremely low, the resistance is assumed to be infinite, indicating an open circuit; if the temperature sensor temperature is detected to be extremely high, the resistance is assumed to be zero, indicating a short circuit. However, there is a lack of methods for fault detection of the temperature sensor when the compressor is stopped. Summary of the Invention

[0004] To overcome the problems existing in related technologies, this disclosure provides a fault detection method for the temperature sensing bulb of an air source water heater, an air source water heater, and a medium.

[0005] According to a first aspect of this disclosure, a fault detection method for temperature sensors in an air source water heater is provided, comprising: in response to detecting that the downtime of the compressor in the air source water heater meets a preset time, acquiring temperature values ​​collected by multiple temperature sensors in the air source water heater respectively; sorting the multiple temperature values ​​and filtering to obtain the maximum temperature value and the minimum temperature value; and determining the temperature sensor that has experienced a temperature deviation fault by performing anomaly determination on the maximum temperature value and the minimum temperature value.

[0006] In some embodiments, determining the temperature sensor that has experienced a temperature deviation fault by performing anomaly determination on the maximum and minimum temperature values ​​includes: An anomaly is determined for the maximum temperature value. If the first anomaly determination condition is met, it is determined that the temperature sensor corresponding to the maximum temperature value has a temperature deviation fault. Anomaly is determined for the minimum temperature value. If the second anomaly determination condition is met, it is determined that the temperature sensor corresponding to the minimum temperature value has a temperature deviation fault.

[0007] In some embodiments, determining that the temperature sensor corresponding to the maximum temperature value has a temperature offset fault if the first anomaly determination condition is met includes: if the difference between the maximum temperature value and the second temperature value is greater than a first threshold, and the difference between the second temperature value and the minimum temperature value is less than a second threshold, then determining that the temperature sensor corresponding to the maximum temperature value has a temperature offset fault; the second temperature value is the temperature value adjacent to the maximum temperature value in the sorting result.

[0008] In some embodiments, determining that the temperature sensor corresponding to the minimum temperature value has a temperature offset fault if the second anomaly determination condition is met includes: if the difference between the third temperature value and the minimum temperature value is greater than a first threshold, and the difference between the maximum temperature value and the third temperature value is less than a second threshold, then determining that the temperature sensor corresponding to the minimum temperature value has a temperature offset fault; the third temperature value is the temperature value adjacent to the minimum temperature value in the sorting result.

[0009] In some embodiments, determining that the temperature sensor corresponding to the maximum temperature value has a temperature deviation fault if the first anomaly determination condition is met includes: If the first anomaly determination condition is met, timing begins; if the timing duration is equal to the first duration, and the first anomaly determination condition is still met, then it is determined that the temperature sensor corresponding to the maximum temperature value has a temperature deviation fault. The step of determining that the temperature sensor corresponding to the minimum temperature value has a temperature deviation fault if the second anomaly determination condition is met includes: starting a timer when the second anomaly determination condition is detected; and determining that the temperature sensor corresponding to the minimum temperature value has a temperature deviation fault if the second anomaly determination condition is still met when the timer duration is equal to the second duration.

[0010] In some embodiments, the temperature sensing element includes an inhalation temperature sensing element, an exhaust temperature sensing element, a pipe temperature sensing element, and / or an ambient temperature sensing element.

[0011] In some embodiments, the temperature sensor further includes a water tank temperature sensor; the method further includes: in response to detecting that the shutdown duration of the compressor meets a preset duration, acquiring a first water temperature value collected by the water tank temperature sensor; if the difference between the first water temperature value and the second water temperature value is greater than a first threshold, determining that the water tank temperature sensor has a temperature deviation fault, wherein the second water temperature value is the water temperature value in the water tank before the compressor stops.

[0012] In some embodiments, the method further includes: determining a preset duration based on the current ambient temperature and historical operating data of the compressor.

[0013] In some embodiments, the method further includes: stopping the anomaly determination in response to detecting that the compressor has started.

[0014] According to a second aspect of this disclosure, a fault detection device for the temperature sensor of an air source water heater is provided, comprising: The detection unit is used to acquire the temperature values ​​collected by multiple temperature sensors in the air source water heater when the shutdown time of the compressor in the air source water heater meets the preset time. The sorting unit is used to sort multiple temperature values ​​and filter to obtain the maximum and minimum temperature values; The judgment unit is used to determine the temperature sensor that has experienced a temperature deviation fault by performing anomaly judgment on the maximum and minimum temperature values.

[0015] According to a third aspect of this disclosure, a storage medium is provided having a computer program stored thereon, which, when executed by a processor, implements the steps of any of the methods described above.

[0016] According to a fourth aspect of this disclosure, an air source water heater is provided, including a processor, a memory, and a computer program stored in the memory that can run on the processor, wherein the processor executes the program to implement the steps of any of the methods described above.

[0017] The technical solution provided in this disclosure can include the following beneficial effects: when the compressor shutdown time in the air source water heater meets a preset time, the temperature values ​​collected by multiple temperature sensors in the air source water heater are acquired, and the multiple temperature values ​​are sorted and filtered to obtain the maximum and minimum temperature values; by performing anomaly judgment on the maximum and minimum temperature values, the temperature sensor that has experienced a temperature deviation fault is identified. This disclosure enables the system to identify temperature deviation faults in temperature sensors during non-operational states, provide timely warnings, and locate the faulty temperature sensor, thereby improving system reliability and maintenance efficiency.

[0018] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the technical solutions of this disclosure.

[0020] Figure 1 This is a structural diagram of an air source water heater according to an exemplary embodiment of this disclosure.

[0021] Figure 2 This is a flowchart illustrating a fault detection method for the temperature sensing element of an air source water heater according to an exemplary embodiment of this disclosure.

[0022] Figure 3 This is a flowchart illustrating a fault detection process for configuring four types of temperature sensors according to an exemplary embodiment of this disclosure.

[0023] Figure 4 This is a flowchart illustrating a fault detection process using three types of temperature sensors according to an exemplary embodiment of this disclosure. Detailed Implementation

[0024] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0025] The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The singular forms “a,” “the,” and “the” as used in this disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0026] Related technologies typically employ real-time monitoring of the temperature sensing bulb's status during system operation and determine whether a malfunction has occurred based on the monitoring results. However, this approach has the following drawbacks: 1. There is a lack of an effective detection mechanism for the status of the temperature sensor when the compressor is not running; 2. It is susceptible to transient anomalies, leading to a high rate of misjudgment; 3. Issues such as temperature deviation and poor contact cannot be identified. For example, the actual temperature of the ambient temperature sensor is 5℃, but the temperature detected by the ambient temperature sensor is 50℃, which indicates a temperature deviation.

[0027] Therefore, there is an urgent need for a method to automatically detect temperature sensor faults when the compressor is stopped, in order to improve the stability of system operation and maintenance efficiency.

[0028] In view of this, this disclosure provides a fault detection method for temperature sensors in an air source water heater. When the compressor shutdown time in the air source water heater meets a preset duration, the method acquires temperature values ​​collected by multiple temperature sensors in the air source water heater, sorts these values, and filters to obtain the maximum and minimum temperature values. By performing anomaly detection on the maximum and minimum temperature values, the method identifies the temperature sensor experiencing a temperature deviation fault. This disclosure enables the system to identify temperature deviations in temperature sensors during non-operational states, providing timely warnings and locating faulty temperature sensors, thereby improving system reliability and maintenance efficiency.

[0029] The following embodiments will illustrate the implementation process of this disclosure in conjunction with the accompanying drawings.

[0030] Figure 1 This is a structural diagram of an air source water heater according to an exemplary embodiment of this disclosure, as shown below. Figure 1 As shown, an air source water heater includes a water tank and an outdoor unit. The water tank and the outdoor unit can be integrated into a single unit to form an integrated air source water heater; or they can be separate units, i.e., a split-type air source water heater.

[0031] Air source heat pump water heaters consist of major components such as a compressor, condenser, throttling device, evaporator, fan, and controller. In addition, air source heat pump water heaters also include detection devices, specifically including intake temperature sensors, exhaust temperature sensors, pipe temperature sensors, and ambient temperature sensors. It should be noted that some models do not include an intake temperature sensor.

[0032] See Figure 1 The suction temperature sensor, located on the compressor suction pipe, is used to detect the suction temperature. The ambient temperature sensor, located on the air inlet side of the evaporator, is used to detect the ambient temperature. The pipe temperature sensor, located at the evaporator inlet, is used to detect the pipe temperature. The exhaust temperature sensor, located on the compressor exhaust pipe, is used to detect the exhaust temperature. .

[0033] Figure 2 This is a flowchart illustrating a fault detection method for the temperature sensor of an air source water heater according to an exemplary embodiment of this disclosure, as shown below. Figure 2 As shown, the fault detection method for the temperature sensing element of the air source water heater includes the following steps 201 to 203.

[0034] In step 201, in response to detecting that the shutdown time of the compressor in the air source water heater meets the preset time, the temperature values ​​collected by multiple temperature sensors in the air source water heater are obtained respectively.

[0035] In this embodiment, the shutdown time of the unit compressor is longer than the preset time. In this case, begin checking if the temperature sensing bulb is malfunctioning. >0, in h. Example. The value of can be 4.

[0036] In this embodiment, the preset duration can be determined based on the current ambient temperature and the compressor's historical operating data. In other words, the system dynamically adjusts the trigger detection time after the compressor stops based on the current ambient temperature and the compressor's historical operating data. For example, extending the detection delay in low-temperature environments improves system adaptability. Simultaneously, temperature change rate analysis is introduced, combined with the current temperature ranking results, to further determine whether there is a trend shift in the temperature sensor, thereby improving the accuracy of fault diagnosis.

[0037] When the unit compressor is shut down for a longer period than the preset time, starting the detection helps the system identify temperature deviations of the temperature sensor in a non-operating state, avoiding misjudgments caused by large temperature deviations of different temperature sensors during unit operation.

[0038] In this embodiment, the multiple temperature sensors may include an intake temperature sensor, an exhaust temperature sensor, a pipe temperature sensor, and / or an ambient temperature sensor.

[0039] In step 202, multiple temperature values ​​are sorted and filtered to obtain the maximum and minimum temperature values.

[0040] In step 203, the temperature sensor that has experienced a temperature deviation fault is identified by performing anomaly determination on the maximum and minimum temperature values.

[0041] In one implementation, the arithmetic mean T of the temperature values ​​collected by all the temperature sensors can be calculated. avg Given the sample standard deviation σ, a confidence interval coefficient k based on the standard deviation is set. The range of normal values ​​is calculated based on the arithmetic mean and the sample standard deviation, i.e., [T]. avg - kσ,T avg + kσ], determine whether the maximum and minimum temperature values ​​exceed this range. If T max >T avg If + kσ, then the temperature sensor corresponding to the maximum temperature value is determined to have a positive offset fault; if T min <T avg If -kσ is found, then the temperature sensor corresponding to the minimum temperature value is determined to have a negative offset fault.

[0042] In this embodiment of the disclosure, a temperature sensor offset fault can also be identified by setting specific temperature difference value combinations. Specifically, the step of determining the temperature sensor with a temperature offset fault by performing anomaly determination on the maximum and minimum temperature values ​​can include: performing anomaly determination on the maximum temperature value; if a first anomaly determination condition is met, then determining that the temperature sensor corresponding to the maximum temperature value has a temperature offset fault; performing anomaly determination on the minimum temperature value; if a second anomaly determination condition is met, then determining that the temperature sensor corresponding to the minimum temperature value has a temperature offset fault.

[0043] In this embodiment, determining that the temperature sensor corresponding to the maximum temperature value has a temperature offset fault if the first anomaly determination condition is met may include: if the difference between the maximum temperature value and the second temperature value is greater than a first threshold, and the difference between the second temperature value and the minimum temperature value is less than a second threshold, then determining that the temperature sensor corresponding to the maximum temperature value has a temperature offset fault; the second temperature value is the temperature value adjacent to the maximum temperature value in the sorting result.

[0044] In this embodiment, determining that the temperature sensor corresponding to the minimum temperature value has a temperature offset fault if the second anomaly determination condition is met may include: if the difference between the third temperature value and the minimum temperature value is greater than a first threshold, and the difference between the maximum temperature value and the third temperature value is less than a second threshold, then determining that the temperature sensor corresponding to the minimum temperature value has a temperature offset fault; the third temperature value is the temperature value adjacent to the minimum temperature value in the sorting result.

[0045] Figure 3 This is a flowchart illustrating a fault detection process using four types of temperature sensors according to an exemplary embodiment of this disclosure. Figure 3 As shown, for air source water heaters equipped with at least an intake temperature sensor, an exhaust temperature sensor, a pipe temperature sensor, and an ambient temperature sensor, the intake temperature is compared in real time. Exhaust temperature Ambient temperature Pipe temperature The four temperature values ​​are sorted as follows: Tx1≥Tx2≥Tx3≥Tx4. This method facilitates the rapid identification of temperature sensors with temperature deviations.

[0046] If Tx1 > Tx2 + m and Tx2 < Tx4 + n, then the temperature sensor with a temperature value equal to Tx1 is determined to have a temperature offset fault, that is, the temperature sensor corresponding to the maximum temperature value has a temperature offset fault.

[0047] If Tx4+m<Tx3 and Tx1<Tx3+n, then the temperature sensor with a temperature value equal to Tx4 is determined to have a temperature offset fault, that is, the temperature sensor corresponding to the minimum temperature value has a temperature offset fault. If none of the above conditions are met, the system is considered fault-free and returns to normal operation.

[0048] Where m is the first threshold and n is the second threshold. For example, m can be 20 and n can be 5.

[0049] In the example above, the second temperature value is Tx2 and the third temperature value is Tx3.

[0050] This embodiment analyzes the sorting and difference of four temperature values ​​(intake, exhaust, ambient, and pipe temperature) after the compressor has been shut down for a certain period of time. This enables the system to identify temperature deviations of the temperature sensor in non-operational states, provide timely warnings, and locate faulty temperature sensors, thereby improving system reliability and maintenance efficiency.

[0051] Figure 4 This is a flowchart illustrating a fault detection process using three types of temperature sensors according to an exemplary embodiment of this disclosure, as shown below. Figure 4 As shown, for air source water heaters equipped with at least an exhaust temperature sensor, a pipe temperature sensor, and an ambient temperature sensor, the exhaust temperature is compared in real time. Ambient temperature Pipe temperature The three temperature values ​​are then sorted as follows: Ty1≥Ty2≥Ty3.

[0052] If Ty1 > Ty2 + m and Ty2 < Ty3 + n, then the temperature sensor with a temperature value equal to Ty1 is determined to have a temperature offset fault, that is, the temperature sensor corresponding to the maximum temperature value has a temperature offset fault.

[0053] If Ty3+m<Ty2 and Ty1<Ty2+n, then the temperature sensor with a temperature value equal to Ty3 is determined to have a temperature offset fault, that is, the temperature sensor corresponding to the minimum temperature value has a temperature offset fault. If none of the above conditions are met, the system is considered fault-free and returns to normal operation.

[0054] In the example above, both the second and third temperature values ​​are Ty2.

[0055] In this embodiment, after the system meets the first and / or second anomaly determination conditions, it continuously records temperature data for a period of time. If the abnormal state persists, it is ultimately determined to be a temperature sensor offset fault; otherwise, it is considered as transient interference, thus avoiding misjudgment due to occasional anomalies.

[0056] In other words, the step of determining that the temperature sensor corresponding to the maximum temperature value has a temperature deviation fault if the first abnormality determination condition is met can include: starting a timer when the first abnormality determination condition is detected; and if the first abnormality determination condition is still met when the timer duration is equal to the first duration, then determining that the temperature sensor corresponding to the maximum temperature value has a temperature deviation fault.

[0057] The step of determining that the temperature sensor corresponding to the minimum temperature value has a temperature deviation fault if the second anomaly determination condition is met may include: starting a timer when the second anomaly determination condition is detected; and if the second anomaly determination condition is still met when the timer duration is equal to the second duration, then determining that the temperature sensor corresponding to the minimum temperature value has a temperature deviation fault.

[0058] In this embodiment, the temperature sensing element further includes a water tank temperature sensing element, which is located on the water tank and used to detect the water tank temperature. The method further includes: in response to detecting that the compressor's shutdown duration meets a preset duration, acquiring a first water temperature value collected by the water tank temperature sensor. If the first water temperature value and the second water temperature value If the difference is greater than the first threshold, it is determined that the water tank temperature sensor has a temperature deviation fault. The second water temperature value is the water temperature value in the water tank before the compressor stops.

[0059] Specifically, it can be detected in real time. And compare the water temperature in the tank before the compressor stopped, i.e., the second water temperature value. If detected for 5 consecutive seconds: > If +m is detected, it indicates a temperature deviation fault in the water tank's temperature sensor.

[0060] During the testing process, if a compressor restart is detected, the system will immediately terminate the current self-test process for the temperature sensor to prevent false faults caused by temperature differences in the temperature sensor due to normal system operation. In other words, the fault determination stops upon detecting the compressor restart.

[0061] This embodiment can effectively reduce system development and maintenance costs and improve development efficiency by borrowing existing temperature sensing bag fault codes and adding new fault types without adding new code resources.

[0062] The above description is merely a preferred embodiment of one or more embodiments of this disclosure and is not intended to limit the scope of one or more embodiments of this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of one or more embodiments of this disclosure should be included within the scope of protection of one or more embodiments of this disclosure.

Claims

1. A fault detection method for a temperature sensing bulb of an air energy water heater, characterized in that, The method comprises the following steps: in response to detecting that the length of time of the compressor in the air energy water heater meeting a preset length of time, acquiring temperature values collected by multiple temperature sensing bags in the air energy water heater respectively; sorting the multiple temperature values to obtain a maximum temperature value and a minimum temperature value; determining the temperature sensing bag that has a temperature deviation fault by performing abnormality determination on the maximum temperature value and the minimum temperature value.

2. The method of claim 1, wherein, The determination of the temperature sensing bag that has a temperature deviation fault by performing abnormality determination on the maximum temperature value and the minimum temperature value comprises: performing abnormality determination on the maximum temperature value, and if a first abnormality determination condition is met, determining that the temperature sensing bag corresponding to the maximum temperature value has a temperature deviation fault; performing abnormality determination on the minimum temperature value, and if a second abnormality determination condition is met, determining that the temperature sensing bag corresponding to the minimum temperature value has a temperature deviation fault.

3. The method of claim 2, wherein, If the difference between the maximum temperature value and a second temperature value is greater than a first threshold value, and the difference between the second temperature value and the minimum temperature value is less than a second threshold value, it is determined that the temperature sensing bag corresponding to the maximum temperature value has a temperature deviation fault; the second temperature value is a temperature value adjacent to the maximum temperature value in the sorting result. If the difference between a third temperature value and the minimum temperature value is greater than a first threshold value, and the difference between the maximum temperature value and the third temperature value is less than a second threshold value, it is determined that the temperature sensing bag corresponding to the minimum temperature value has a temperature deviation fault; the third temperature value is a temperature value adjacent to the minimum temperature value in the sorting result.

4. The method of claim 2, wherein, If the first abnormality determination condition is met, start timing; if the first abnormality determination condition is still met when the length of time is equal to a first length of time, it is determined that the temperature sensing bag corresponding to the maximum temperature value has a temperature deviation fault.

5. The method of claim 2, wherein, If the second abnormality determination condition is met, start timing; if the second abnormality determination condition is still met when the length of time is equal to a second length of time, it is determined that the temperature sensing bag corresponding to the minimum temperature value has a temperature deviation fault. The temperature sensing bag comprises an air suction temperature sensing bag, an air exhaust temperature sensing bag, a pipe temperature sensing bag and / or an environment temperature sensing bag. The temperature sensing bag further comprises a water tank temperature sensing bag; the method further comprises: in response to detecting that the length of time of the compressor meeting a preset length of time, acquiring a first water temperature value collected by the water tank temperature sensing bag; if the difference between the first water temperature value and a second water temperature value is greater than a first threshold value, it is determined that the water tank temperature sensing bag has a temperature deviation fault; the second water temperature value is the water temperature value in the water tank before the compressor stops.

6. The method of claim 1, wherein, The method further comprises:

7. The method of claim 6, wherein, determining the preset length of time according to the current environment temperature and historical operation data of the compressor. ​ ​ 8. The method according to any one of claims 1-7, characterized in that, ​ ​ 9. The method according to any one of claims 1-7, characterized in that, The method further comprises: stopping the abnormality determination in response to detecting the start of the compressor.

10. A storage medium, characterized by A computer program product having stored thereon the computer program, which program is loadable into the internal memory of the processor and / or executable by the processor and causes the processor to execute the steps of the method according to any one of claims 1 to 9 when the program is executed by the processor.

11. An air energy water heater, characterized by, A computer program product having stored thereon the computer program, which program is loadable into the internal memory of the processor and / or executable by the processor and causes the processor to execute the steps of the method according to any one of claims 1 to 9 when the program is executed by the processor.

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