Fault detection method and device for air conditioner electric heating device and intelligent air conditioner

Abstract

The present application relates to the field of smart home appliance technology and discloses a fault detection method for an air conditioner electric heating device. The fault detection method for an air conditioner electric heating device comprises: in an electric heating mode, obtaining a first operating current of the air conditioner in a first detection cycle, and a second operating current of the air conditioner in a second detection cycle, wherein the first detection cycle is adjacent to the second detection cycle; obtaining a first current difference between the first operating current and the second operating current; and determining that the air conditioner electric heating device has a fault when the first current difference is greater than or equal to a first preset current for a duration greater than or equal to a fault determination duration. By adopting the fault detection method for an air conditioner electric heating device, no additional hardware is added during the fault detection process of the electric heating device, thereby reducing the fault detection cost of the electric heating device and thereby reducing the production cost of the air conditioner. The present application also discloses a fault detection device for an air conditioner electric heating device and a smart air conditioner.

Description

Technical Field

[0001] The present application relates to the technical field of smart home appliances, for example, to a fault detection method and device for an air-conditioning electric heating device and a smart air-conditioner. Background Art

[0002] Currently, air conditioners are often equipped with electric heaters, such as semiconductor heaters with a positive temperature coefficient (PTC), to enhance heating efficiency. These heaters have corresponding temperature protectors, which offer two protective measures: a temperature switch, which shuts off the heater if the temperature is too high and reenergizes it if the temperature is not too high; and a current fuse, which blows if the current flowing through the heater is too high, necessitating replacement.

[0003] During the heating process of the electric heating device in the air conditioner, due to usage conditions or product performance defects, the current fuse burns out (the air conditioner is operating normally at this time), making the electric heating device unable to continue heating. Because the electric heating device does not have the function of feedback signals to the controller of the air conditioner, after the current fuse blows, there is no prompt reminder or fault display, which reduces the user experience.

[0004] In this regard, some existing technologies have been improved. The current of the electric heater is detected by a current detection device. When the switch selection operation of the electric heating device is to turn on heating, if the detected current of the electric heater is less than the turn-on reference current value, a damage prompt is issued during heating, thereby completing the fault detection function of the electric heating device, so that the user can know the working status of the electric heating device in a timely manner.

[0005] During the implementation of the embodiments of the present application, it was found that at least the following problems exist in the related art:

[0006] A current detection unit is provided on the electrical control panel of existing air conditioners to detect the current of the air conditioner product and to adjust the operating frequency to current limit or perform shutdown protection based on the current level. However, this current detection unit does not have the function of detecting the current of the electric heating device. In order to detect the current of the electric heating device, an additional current detection unit needs to be provided, which increases the production cost of the air conditioner. Summary of the Invention

[0007] In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not an extensive review, nor is it intended to identify key / critical elements or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

[0008] The embodiments of the present application provide a fault detection method and device for an electric heating device of an air conditioner, and an intelligent air conditioner, so as to reduce the hardware cost of the fault detection function of the electric heating device and reduce the production cost of the air conditioner.

[0009] In some embodiments, a fault detection method for an air conditioner electric heating device includes: in an electric heating mode, obtaining a first working current of the air conditioner in a first detection cycle, and a second working current of the air conditioner in a second detection cycle, wherein the first detection cycle is adjacent to the second detection cycle, and the second detection cycle is located after the first detection cycle; obtaining a first current difference between the first working current and the second working current; and determining that a fault has occurred in the air conditioner electric heating device when the first current difference is greater than or equal to a first preset current and the duration is greater than or equal to the fault judgment duration.

[0010] Optionally, the first preset current is determined by: obtaining the second indoor fan speed of the air conditioner in the second detection period; obtaining a current coefficient corresponding to the second indoor fan speed; wherein the current coefficient is positively correlated with the second indoor fan speed; determining the first preset current based on the first product of the nominal current of the electric heating device and the current coefficient; wherein the first preset current is positively correlated with the first product.

[0011] Optionally, obtaining the current coefficient corresponding to the second indoor fan speed includes: obtaining the first indoor fan speed of the air conditioner in the first detection period; obtaining a first current coefficient corresponding to the first indoor fan speed and a second current coefficient corresponding to the second indoor fan speed based on the correspondence between the speed and the coefficient; and determining the difference between the coefficient of the second current coefficient and the first current coefficient and the sum of the coefficients of the second current coefficient as the current coefficient.

[0012] Optionally, determining the first preset current based on the first product of the nominal current of the electric heating device and the current coefficient includes: obtaining a first compressor frequency of the air conditioner in the first detection cycle and a second compressor frequency in the second detection cycle; determining a frequency correction current based on a frequency difference between the first compressor frequency and the second compressor frequency; and determining the sum of the frequency correction current and the first product as the first preset current.

[0013] Optionally, determining the frequency correction current based on the frequency difference between the first compressor frequency and the second compressor frequency includes: obtaining the rated current and rated frequency of the air conditioner compressor; obtaining the ratio of the frequency difference to the rated frequency; determining the frequency correction current based on a second product of the rated current and the ratio; wherein the frequency correction current is positively correlated with the rated current, and the frequency correction current is positively correlated with the ratio.

[0014] Optionally, the fault detection method for the electric heating device of an air conditioner also includes: when the duration that the first current difference is greater than or equal to the first preset current is less than the fault judgment duration, obtaining the third working current of the air conditioner in the third detection cycle and the fourth working current in the fourth detection cycle; wherein the third detection cycle and the fourth detection cycle are adjacent, the fourth detection cycle is after the third detection cycle, and the third detection cycle is after the second detection cycle; obtaining the second current difference between the fourth working current and the third working current; if the second current difference is greater than or equal to the second preset current, determining that the electric heating device is working normally; wherein the second preset current is greater than or equal to the first preset current.

[0015] Optionally, the fault detection method for the air-conditioning electric heating device also includes: determining that an abnormality occurs in the electric heating device when the duration of the first current difference being greater than or equal to the first preset current is greater than or equal to the abnormality judgment time; wherein the abnormality judgment time is less than the fault judgment time.

[0016] Optionally, the fault detection device of the air conditioner electric heating device includes a first acquisition module, a second acquisition module and a first determination module; the first acquisition module is configured to obtain the first working current of the air conditioner in the first detection cycle and the second working current of the air conditioner in the second detection cycle in the electric heating mode, the first detection cycle is adjacent to the second detection cycle, and the second detection cycle is located after the first detection cycle; the second acquisition module is configured to obtain the first current difference between the first working current and the second working current; the first determination module is configured to determine that the electric heating device of the air conditioner has a fault when the duration of the first current difference being greater than or equal to the first preset current is greater than or equal to the fault judgment time.

[0017] In some embodiments, a fault detection device for an air-conditioning electric heating device includes a processor and a memory storing program instructions, wherein the processor is configured to execute the fault detection method for the air-conditioning electric heating device provided in the aforementioned embodiment when executing the program instructions.

[0018] In some embodiments, the smart air conditioner includes the fault detection device of the air conditioner electric heating device provided in the aforementioned embodiments.

[0019] The fault detection method and device for an air conditioner electric heating device and the intelligent air conditioner provided in the embodiments of the present application can achieve the following technical effects:

[0020] The first working current of the air conditioner in the first detection cycle and the second working current in the second detection cycle can both be obtained through the air conditioner's built-in current detection unit. If the first current difference between the first working current and the second working current is greater than or equal to the first preset current, it means that the electric heating device has stopped heating. At this time, there are two possibilities: one is that the temperature protection switch of the temperature protector is disconnected, and the temperature protection switch has an automatic recovery function; the other is that the current fuse of the temperature protector is blown. In this case, if the first current difference is greater than or equal to the first preset current for a duration greater than or equal to the fault judgment duration, it can be determined that the electric heating device has a fault. In the above-mentioned fault detection process of the electric heating device, no additional hardware (such as a detection unit for detecting the current of the electric heating device) is added, which can reduce the fault detection cost of the electric heating device, thereby reducing the production cost of the air conditioner.

[0021] The above general description and the following description are exemplary and explanatory only and are not intended to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] One or more embodiments are exemplarily described by corresponding drawings. These exemplary descriptions and drawings do not limit the embodiments. Elements with the same reference numerals in the drawings are considered similar elements, and wherein:

[0023] Figure 1 Schematic diagram of an electric control device for an air conditioner provided in an embodiment of the present application;

[0024] Figure 2 This is a flow chart of a fault detection method for an air-conditioning electric heating device provided in an embodiment of the present application;

[0025] Figure 3 This is a flow chart of a fault detection method for an air-conditioning electric heating device provided in an embodiment of the present application;

[0026] Figure 4 This is a flow chart of a fault detection method for an air-conditioning electric heating device provided in an embodiment of the present application;

[0027] Figure 5 This is a schematic diagram of a fault detection device for an air-conditioning electric heating device provided in an embodiment of the present application;

[0028] Figure 6Schematic diagram of a fault detection device for an air-conditioning electric heating device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0029] In order to be able to understand the features and technical contents of the embodiments of the present application in more detail, the implementation of the embodiments of the present application is described in detail below with reference to the accompanying drawings. The accompanying drawings are for reference only and are not used to limit the embodiments of the present application. In the following technical description, for the sake of convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0030] In the description and claims of the embodiments of the present application and the accompanying drawings, the terms "first," "second," and the like are used to distinguish similar objects and are not necessarily used to describe a particular order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate for the purposes of describing the embodiments of the present application. In addition, the terms "including," "having," and any variations thereof are intended to cover non-exclusive inclusions.

[0031] Unless otherwise stated, the term "plurality" means more than two.

[0032] In the embodiments of the present application, the character " / " indicates that the preceding and following objects are in an "or" relationship. For example, A / B means: A or B.

[0033] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0034] Figure 1 This is a schematic diagram of an electronic control device for an air conditioner provided in an embodiment of the present application. The air conditioner in this embodiment specifically refers to an air conditioner with an electric heating device. During the heating process, the condenser of the air conditioner has a heating function, and the electric heating device of the air conditioner also has a heating function. The electric heating device here can be a PTC semiconductor heating device.

[0035] Combine Figure 1 As shown, the air conditioner includes a controller 11 , an electric heating device 12 , a temperature protector 13 , a current detection unit 14 and a prompt unit 15 .

[0036] The current detection unit 14 here refers to a current detection unit commonly used in conventional air conditioners, and has the function of detecting the total current of the air conditioner.

[0037] The prompt unit 15 here refers to a unit with a prompt function, for example, a display panel and / or a speaker provided on an air conditioner indoor unit, or a display panel and / or a speaker on a control panel communicatively connected to the air conditioner.

[0038] The controller 11 is in communication connection with the electric heating device 12 . When a condition for entering the electric heating mode is met, the controller 11 causes the electric heating device 12 to enter the electric heating mode.

[0039] The electric heating device 12 is connected to the temperature protector 13. The temperature sensing element of the temperature protection switch in the temperature protector 13 (for example, a temperature sensing element composed of a bimetallic strip) can be deformed at the temperature of the electric heating device 12. When the temperature of the electric heating device 12 is too high, the temperature protector 13 switches the electric heating device 12 from a powered-on state to a powered-off state. For example, the temperature protector 13 sends a control signal to the relay that energizes the electric heating device 12, so that the relay that energizes the electric heating device 12 switches from an on state to an off state; when the current passing through the electric heating device 12 is too large, the current fuse provided in the temperature protector 13 will be blown to ensure the power safety of the electric heating device 12.

[0040] The controller 11 can obtain the working current of the air conditioner through the current detection unit 14, and judge the status of the electric heating device 12 based on the working current of the air conditioner: the temperature protection switch is activated (resettable) or the current fuse is blown, and after determining that the current fuse is blown, the prompt unit prompts the user in the form of sound / light, so that the user can understand the specific situation of the electric heating device 12 (or temperature protector 13) in time and arrange maintenance in time.

[0041] Those skilled in the art know that the current passing through the electric heating device 12 is closely related to its fault state. Based on this consensus, the most common practice is to directly detect the current passing through the electric heating device 12; in the present application, the air conditioner's own current detection unit 14 is used to detect the air conditioner's working current, so as to determine the fault state of the electric heating device 12. There is no need to set up an independent current detection unit to detect the current passing through the electric heating device 12, which reduces the hardware cost of the fault detection function and reduces the production cost of the air conditioner.

[0042] Figure 2 This is a flow chart of a method for detecting a fault in an air conditioner electric heating device, provided in an embodiment of the present application. This method can be executed by an air conditioner controller, a control panel communicatively connected to the air conditioner, or a server communicatively connected to the air conditioner.

[0043] Combine Figure 2 As shown, the fault detection method of the electric heating device of the air conditioner includes:

[0044] S201 . In an electric heating mode, obtaining a first operating current of an air conditioner in a first detection cycle and a second operating current of the air conditioner in a second detection cycle.

[0045] The heating operation mode of the air conditioner can include cooling mode and heating mode, and the heating mode includes electric heating mode and conventional condenser heating mode. In the electric heating mode, the electric heating device and condenser of the air conditioner heat the indoor air at the same time.

[0046] When the indoor temperature is not too low, for example, the indoor temperature is greater than the set lower limit ambient temperature, the air conditioner operates in conventional condenser heating mode, and the air conditioner heats the indoor air through the condenser; when the indoor temperature is too low, for example, the indoor temperature is lower than the set lower limit ambient temperature, the air conditioner operates in electric heating mode, and the air conditioner heats the indoor air through the condenser and the electric heating device.

[0047] Alternatively, a user instruction may be received, and the conventional condenser heating mode or the electric heating mode may be entered in response to the user instruction.

[0048] The first detection period and the second detection period have the same duration. For example, the first detection period and the second detection period can both be 1s, 2s, 3s, 4s, 5s, 6s, 7s, 8s or 9s.

[0049] The first detection period is adjacent to the second detection period, and the second detection period is located after the first detection period. Taking a detection period of 3 seconds as an example, the time relationship between the first detection period and the second detection period is illustrated as follows: the first detection period is 0 seconds to 3 seconds, and the second detection period is 3 seconds to 6 seconds. If the first detection period includes the 3-second moment, the second detection period does not include the 3-second moment; if the first detection period does not include the 3-second moment, the second detection period includes the 3-second moment.

[0050] In each detection cycle, the operating current of the air conditioner may be detected once, or the operating current of the air conditioner may be detected multiple times, and the average of the multiple operating currents may be calculated. For example, in the first detection cycle, the operating current of the air conditioner may be detected once and determined as the first operating current; alternatively, the operating current of the air conditioner may be detected multiple times, and the average of the multiple operating currents may be determined as the first operating current. In the second detection cycle, the operating current of the air conditioner may be detected once and determined as the second operating current; alternatively, the operating current of the air conditioner may be detected multiple times, and the average of the multiple operating currents may be determined as the second operating current.

[0051] Through the above method, the first operating current of the air conditioner in the first detection period and the second operating current of the air conditioner in the second detection period can be obtained.

[0052] S202: Obtain a first current difference between the first operating current and the second operating current.

[0053] The first current difference can be obtained by subtracting the second operating current from the first operating current. The first current difference can be used to indicate the amount by which the second operating current is reduced relative to the first operating current.

[0054] S203: When the duration during which the first current difference is greater than or equal to the first preset current is greater than or equal to the fault determination time, determine that the electric heating device of the air conditioner is faulty.

[0055] If a positive value is obtained by subtracting the second operating current from the first operating current to obtain a first current difference, the total current of the air conditioner is decreasing. Furthermore, if the first current difference is greater than a first preset current, the decrease in the total current of the air conditioner corresponds to the current decrease when the electric heating device switches from an energized state to an off state. If the duration for which the first current difference is greater than or equal to the first preset current is greater than or equal to the fault determination time, this indicates that the temperature protection switch in the temperature protector corresponding to the electric heating device has not been restored. This condition is classified as a blown current fuse, and a fault is determined in the electric heating device of the air conditioner.

[0056] The first working current of the air conditioner in the first detection cycle and the second working current in the second detection cycle can both be obtained through the air conditioner's built-in current detection unit. If the first current difference between the first working current and the second working current is greater than or equal to the first preset current, it means that the electric heating device has stopped heating. At this time, there are two possibilities: one is that the temperature protection switch of the temperature protector is disconnected, and the temperature protection switch has an automatic recovery function; the other is that the current fuse of the temperature protector is blown. In this case, if the first current difference is greater than or equal to the first preset current for a duration greater than or equal to the fault judgment duration, it can be determined that the electric heating device has a fault. In the above-mentioned fault detection process of the electric heating device, no additional hardware (such as a detection unit for detecting the current of the electric heating device) is added, which can reduce the fault detection cost of the electric heating device, thereby reducing the production cost of the air conditioner.

[0057] The first preset current in the above embodiment is described in detail below:

[0058] The first preset current may represent a current reduction amount after the electric heating device is switched from a power-on state to a power-off state.

[0059] The nominal current of the electric heating device may be determined as the first preset current. Alternatively, the quotient of the nominal power of the electric heating device and the nominal current may be determined as the first preset current.

[0060] Furthermore, the first preset current can be determined in the following manner: obtaining the second indoor fan speed of the air conditioner in the second detection cycle; obtaining the current coefficient corresponding to the second indoor fan speed, wherein the current coefficient is positively correlated with the second indoor fan speed; determining the first preset current based on the first product of the nominal current of the electric heating device and the current coefficient; wherein the first preset current is positively correlated with the first product.

[0061] The indoor fan speed corresponds to the air output speed of the air conditioner's indoor unit. The air conditioner's air output speed can include five settings: strong, high, medium, low, and silent. The indoor fan speed corresponding to the strong setting is greater than the indoor fan speed corresponding to the high setting, the indoor fan speed corresponding to the high setting is greater than the indoor fan speed corresponding to the low setting, and the indoor fan speed corresponding to the low setting is greater than the indoor fan speed corresponding to the silent setting. Furthermore, the corresponding relationship between indoor wind speed and current coefficient is shown in Table 1.

[0062] Table 1 Corresponding relationship between indoor wind speed and current coefficient

[0063]

[0064]

[0065] As shown in Table 1, the current coefficient corresponding to the strong wind speed setting is a1, the current coefficient corresponding to the high wind speed setting is a2, the current coefficient corresponding to the medium wind speed setting is a3, the current coefficient corresponding to the low wind speed setting is a4, and the current coefficient corresponding to the silent wind speed setting is a5. Furthermore, reference values for the current coefficients a1, a2, a3, a4, and a5 are further provided. Of course, in a specific implementation, different reference values from those in Table 1 may be assigned to the current coefficients a1, a2, a3, a4, and a5, as long as a1>a2>a3>a4>a5 are ensured.

[0066] By using the corresponding relationship shown in Table 1, the current coefficient corresponding to the second indoor fan speed can be obtained.

[0067] The aforementioned determination of the first preset current based on the first product of the nominal current of the electric heating device and the current coefficient may be implemented as follows: the first preset current is determined as the first product of the nominal current of the electric heating device and the current coefficient.

[0068] The first preset current determined in the above manner is related to the operating state of the air conditioner (the second indoor fan speed in the second detection cycle), so that the first preset current is positively correlated with the second fan speed, which is in line with the actual application scenario of high wind speed, fast heat dissipation of the electric heating device, and high heating power of the electric heating device. It can more accurately reflect the current reduction caused by the electric heating device switching from the power-on state to the power-off state, and thus more accurately determine the fault state of the electric heating device.

[0069] When the first indoor fan speed in the first detection period is not much different from the second indoor fan speed in the second detection period, for example, the absolute value of the speed difference between the first indoor fan speed and the second indoor fan speed is less than or equal to the preset speed, the first preset current can be obtained in the above manner.

[0070] Furthermore, the first preset fan speed can be determined in the following manner: obtain the first indoor fan speed of the air conditioner in the first detection period; obtain the second indoor fan speed of the air conditioner in the second detection period; according to the correspondence between the speed and the coefficient, obtain the first current coefficient corresponding to the first indoor fan speed, and the second current coefficient corresponding to the second indoor fan speed; determine the difference between the coefficient of the second current coefficient and the first current coefficient and the sum of the coefficients of the second current coefficient as the current coefficient.

[0071] The above-mentioned first indoor fan speed may be an indoor fan speed detected in the first detection period, or it may be the average value of multiple indoor fan speeds detected in the first detection period; the above-mentioned second indoor fan speed may be an indoor fan speed detected in the second detection period, or it may be the average value of multiple indoor fan speeds detected in the second detection period.

[0072] The correspondence between the speeds and the coefficients described above can also refer to the correspondence shown in Table 1. By determining the current coefficient in the above manner, even when there is a large difference between the first indoor fan speed and the second indoor fan speed, for example, when the speed difference between the first indoor fan speed and the second indoor fan speed is greater than the preset speed, a more accurate first preset current can be obtained that is more consistent with actual conditions, thereby more accurately determining a fault condition of the electric heating device.

[0073] In the above embodiment, the actual operating state of the air conditioner (such as the first indoor fan speed and the second indoor fan speed) is fully combined to obtain a relatively accurate first preset current, thereby more accurately determining the fault state of the electric heating device.

[0074] In addition, in order to obtain a more accurate first preset current, the following method can also be used:

[0075] Obtain a second indoor fan speed of the air conditioner in a second detection cycle; obtain a current coefficient corresponding to the second indoor fan speed, wherein the current coefficient is positively correlated with the second indoor fan speed; obtain a first product of a nominal current of the electric heating device and the current coefficient; obtain a first compressor frequency of the air conditioner in the first detection cycle, and a second compressor frequency in the second detection cycle; determine a frequency correction current based on a frequency difference between the first compressor frequency and the second compressor frequency; and determine the sum of the frequency correction current and the first product as a first preset current.

[0076] The above-mentioned first compressor frequency can be a compressor frequency detected in the first detection period, or it can be the average value of multiple compressor frequencies detected in the first detection period; the above-mentioned second compressor frequency can be a compressor frequency detected in the second detection period, or it can be the average value of multiple compressor frequencies detected in the second detection period.

[0077] By making further correction to the current (first product) determined based on the fan speed using the change in the compressor frequency, a more accurate first preset current can be obtained, thereby more accurately determining the fault state of the electric heating device.

[0078] Optionally, the frequency correction current is determined based on the frequency difference between the first compressor frequency and the second compressor frequency, including: obtaining the rated current and rated frequency of the air conditioner compressor; obtaining the ratio of the frequency difference to the rated frequency; determining the frequency correction current based on the second product of the rated current and the ratio; wherein the frequency correction current is positively correlated with the rated current, and the frequency correction current is positively correlated with the ratio.

[0079] For example, the second product of the rated current and the ratio can be determined as the frequency correction current. In this way, the frequency correction current can be obtained, and the first preset current can be further obtained to determine the fault state of the electric heating device.

[0080] Figure 3 This is a flow chart of a method for detecting a fault in an air conditioner electric heating device, provided in an embodiment of the present application. This method can be executed by an air conditioner controller, a control panel communicatively connected to the air conditioner, or a server communicatively connected to the air conditioner.

[0081] Combine Figure 3 As shown, the fault detection method of the electric heating device of the air conditioner includes:

[0082] S301 : In an electric heating mode, obtaining a first operating current of an air conditioner in a first detection cycle and a second operating current of the air conditioner in a second detection cycle.

[0083] The first detection period is adjacent to the second detection period, and the second detection period is located after the first detection period.

[0084] S302: Obtain a first current difference between the first operating current and the second operating current.

[0085] The first current difference may be obtained by subtracting the second operating current from the first operating current.

[0086] S303. When the duration during which the first current difference is greater than or equal to the first preset current is less than the fault determination duration, obtain a third operating current of the air conditioner in a third detection cycle and a fourth operating current in a fourth detection cycle.

[0087] The third detection cycle and the fourth detection cycle are adjacent to each other, the fourth detection cycle is after the third detection cycle, and the third detection cycle is after the second detection cycle.

[0088] S304: Obtain a second current difference between the fourth operating current and the third operating current.

[0089] The second current difference may be obtained by subtracting the third operating current from the fourth operating current.

[0090] S305: If the second current difference is greater than or equal to the second preset current, it is determined that the electric heating device is operating normally; wherein the second preset current is greater than or equal to the first preset current.

[0091] The third current difference between the second preset current and the first preset current can be inversely correlated with the indoor temperature detected during the fourth detection cycle. The higher the indoor temperature, the smaller the third current difference; the lower the indoor temperature, the larger the third current difference. When using a PTC semiconductor electric heating device, the higher the indoor temperature, the smaller the temperature drop of the electric heating device. At the same time, the greater the resistance of the electric heating device, the smaller the current increase after the temperature drop of the electric heating device; the lower the indoor temperature, the greater the temperature drop of the electric heating device. At the same time, the smaller the resistance of the electric heating device, the larger the current increase after the temperature drop of the electric heating device. In this way, the technical solution of inverse correlation between the third current difference and the indoor temperature detected during the fourth detection cycle is more consistent with the situation of using a PTC semiconductor electric heating device, and can more accurately distinguish whether the decrease and then increase of the operating current of the air conditioner indicates that the current fuse has blown, or whether it indicates that the temperature protection switch has been activated.

[0092] S306: When the duration during which the first current difference is greater than or equal to the first preset current is greater than or equal to the fault determination time, determine that the electric heating device of the air conditioner is faulty.

[0093] Figure 4 This is a flow chart of a method for detecting a fault in an air conditioner electric heating device, provided in an embodiment of the present application. This method can be executed by an air conditioner controller, a control panel communicatively connected to the air conditioner, or a server communicatively connected to the air conditioner.

[0094] Combine Figure 4 As shown, the fault detection method of the electric heating device of the air conditioner includes:

[0095] S401 . In an electric heating mode, obtaining a first operating current of an air conditioner in a first detection cycle and a second operating current of the air conditioner in a second detection cycle.

[0096] The first detection period is adjacent to the second detection period, and the second detection period is located after the first detection period.

[0097] S402: Obtain a first current difference between the first operating current and the second operating current.

[0098] S403: When the duration of the first current difference being greater than or equal to the first preset current is greater than or equal to the abnormality determination duration, determine that the electric heating device has an abnormality and record the abnormality.

[0099] S404: When the duration during which the first current difference is greater than or equal to the first preset current is greater than or equal to the fault determination time, determine that the electric heating device of the air conditioner is faulty.

[0100] Among them, the fault judgment time is longer than the abnormality judgment time.

[0101] S405: When the duration during which the first current difference is greater than or equal to the first preset current is less than the fault determination duration, clear the recorded abnormal state of the electric heating device.

[0102] Of course, this step can also be replaced by continuously accumulating the number of abnormalities of the electric heating device. After the number of abnormalities is greater than or equal to the set number, it is also determined that the electric heating device has a fault.

[0103] Figure 5 Schematic diagram of a fault detection device for an air conditioner electric heating device provided by an embodiment of the present application. The fault detection device for an air conditioner electric heating device can be implemented in the form of software, hardware, or a combination of software and hardware.

[0104] Combine Figure 5 As shown, the fault detection device for the electric heating device of the air conditioner includes a first obtaining module 51, a second obtaining module 52 and a first determining module 53;

[0105] The first obtaining module 51 is configured to obtain, in the electric heating mode, a first operating current of the air conditioner in a first detection cycle and a second operating current of the air conditioner in a second detection cycle, wherein the first detection cycle is adjacent to the second detection cycle and the second detection cycle is located after the first detection cycle;

[0106] The second obtaining module 52 is configured to obtain a first current difference between the first working current and the second working current;

[0107] The first determining module 53 is configured to determine that the electric heating device of the air conditioner is faulty if the duration during which the first current difference is greater than or equal to the first preset current is greater than or equal to the fault determination duration.

[0108] Optionally, the first preset current is determined by: obtaining the second indoor fan speed of the air conditioner in the second detection cycle; obtaining the current coefficient corresponding to the second indoor fan speed; wherein the current coefficient is positively correlated with the second indoor fan speed; determining the first preset current based on the first product of the nominal current of the electric heating device and the current coefficient; wherein the first preset current is positively correlated with the first product.

[0109] Optionally, obtaining the current coefficient corresponding to the second indoor fan speed includes: obtaining the first indoor fan speed of the air conditioner in the first detection cycle; obtaining a first current coefficient corresponding to the first indoor fan speed and a second current coefficient corresponding to the second indoor fan speed based on the correspondence between the speed and the coefficient; and determining the difference between the coefficient of the second current coefficient and the first current coefficient and the sum of the coefficients of the second current coefficient as the current coefficient.

[0110] Optionally, a first preset current is determined based on a first product of a nominal current of the electric heating device and a current coefficient, including: obtaining a first compressor frequency of the air conditioner in a first detection cycle and a second compressor frequency in a second detection cycle; determining a frequency correction current based on a frequency difference between the first compressor frequency and the second compressor frequency; and determining the sum of the frequency correction current and the first product as the first preset current.

[0111] Optionally, the frequency correction current is determined based on the frequency difference between the first compressor frequency and the second compressor frequency, including: obtaining the rated current and rated frequency of the air conditioner compressor; obtaining the ratio of the frequency difference to the rated frequency; determining the frequency correction current based on the second product of the rated current and the ratio; wherein the frequency correction current is positively correlated with the rated current, and the frequency correction current is positively correlated with the ratio.

[0112] Optionally, the fault detection method of the air-conditioning electric heating device also includes a third acquisition module, a fourth acquisition module and a second determination module; the third acquisition module is configured to obtain the third working current of the air-conditioning in the third detection cycle and the fourth working current in the fourth detection cycle when the duration of the first current difference being greater than or equal to the first preset current is less than the fault judgment duration; wherein the third detection cycle and the fourth detection cycle are adjacent, the fourth detection cycle is after the third detection cycle, and the third detection cycle is after the second detection cycle; the fourth acquisition module is configured to obtain the second current difference between the fourth working current and the third working current; the second determination module is configured to determine that the electric heating device is working normally if the second current difference is greater than or equal to the second preset current; wherein the second preset current is greater than or equal to the first preset current.

[0113] Optionally, the fault detection device of the air-conditioning electric heating device also includes a third determination module, which is configured to determine that an abnormality has occurred in the electric heating device when the duration of the first current difference being greater than or equal to the first preset current is greater than or equal to the abnormality determination time; wherein the abnormality determination time is less than the fault determination time.

[0114] In some embodiments, the fault detection device for an air conditioning electric heating device includes a processor and a memory storing program instructions. The processor is configured to execute the fault detection method for an air conditioning electric heating device provided in the above embodiments when executing the program instructions.

[0115] Figure 6 Schematic diagram of a fault detection device for an air-conditioning electric heating device provided by an embodiment of the present application. Figure 6 As shown, the fault detection device of the air conditioner electric heating device includes:

[0116] The processor 61 and memory 62 may also include a communication interface 63 and a bus 64. The processor 61, communication interface 63, and memory 62 may communicate with each other via the bus 64. The communication interface 63 may be used for information transmission. The processor 61 may invoke the logic instructions in the memory 62 to execute the fault detection method for the electric heating device of the air conditioner provided in the aforementioned embodiment.

[0117] In addition, the logic instructions in the memory 62 can be implemented in the form of software functional units and stored in a computer-readable storage medium when sold or used as an independent product.

[0118] Memory 62, as a computer-readable storage medium, can be used to store software programs and computer-executable programs, such as program instructions / modules corresponding to the methods in the embodiments of the present application. Processor 61 executes the software programs, instructions, and modules stored in memory 62 to perform functional applications and data processing, thereby implementing the methods in the above-mentioned method embodiments.

[0119] The memory 62 may include a program storage area and a data storage area. The program storage area may store an operating system and at least one application required for a function; the data storage area may store data generated based on the use of the terminal device. Furthermore, the memory 62 may include high-speed random access memory and non-volatile memory.

[0120] An embodiment of the present application provides an intelligent air conditioner, comprising the fault detection device for the air conditioner electric heating device provided in the aforementioned embodiment.

[0121] An embodiment of the present application provides a computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are configured to execute the fault detection method for the air-conditioning electric heating device provided in the aforementioned embodiment.

[0122] An embodiment of the present application provides a computer program product, which includes a computer program stored on a computer-readable storage medium. The computer program includes program instructions. When the program instructions are executed by a computer, the computer executes the fault detection method for the air-conditioning electric heating device provided in the aforementioned embodiment.

[0123] The aforementioned computer-readable storage medium may be a transient computer-readable storage medium or a non-transitory computer-readable storage medium.

[0124] The technical solutions of the embodiments of the present application can be embodied in the form of a software product, which is stored in a storage medium and includes one or more instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method of the embodiments of the present application. The aforementioned storage medium can be a non-transitory storage medium, including: a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and other media that can store program code, or a transient storage medium.

[0125] The above description and accompanying drawings sufficiently illustrate the embodiments of the present application to enable those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, process, and other changes. The embodiments represent only possible variations. Unless expressly required, individual components and functions are optional, and the order of operations may vary. Portions and features of some embodiments may be included in or substituted for portions and features of other embodiments. Furthermore, the terms used in this application are intended only to describe the embodiments and are not intended to limit the claims. As used in the embodiments and in the claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. In addition, when used in this application, the terms "comprise" and its variations "comprises" and / or "comprising" refer to the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. In the absence of further limitations, the phrase "comprising a..." does not preclude the presence of other identical elements in the process, method, or apparatus comprising the elements. In this document, each embodiment may focus on the differences from other embodiments, and similar portions between the embodiments may refer to each other. For methods, products, etc. disclosed in the embodiments, if they correspond to the method portion disclosed in the embodiments, the relevant portions may refer to the description of the method portion.

[0126] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented with electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software may depend on the specific application and design constraints of the technical solution. Technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the embodiments of the present application. Technicians can clearly understand that for the convenience and brevity of description, the specific working process of the above-described systems, devices and units can refer to the corresponding process in the aforementioned method embodiment and will not be repeated here.

[0127] In the embodiments disclosed herein, the disclosed methods and products (including but not limited to devices, equipment, etc.) can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of units can be merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between each other shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to implement this embodiment. In addition, the functional units in the embodiments of the present application may be integrated into a processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit.

[0128] The flow charts and block diagrams in the accompanying drawings show the possible architecture, functions and operations of the system, method and computer program product according to the embodiments of the present application. In this regard, each box in the flow chart or block diagram can represent a part of a module, program segment or code, and a part of a module, program segment or code comprises one or more executable instructions for realizing the logical function of the specification. In some alternative implementations, the functions marked in the box can also occur in a sequence different from that marked in the accompanying drawings. For example, two continuous boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, which can depend on the functions involved. Each box in the block diagram and / or flow chart, and the combination of the boxes in the block diagram and / or flow chart can be implemented by a special hardware-based system that performs the function or action of the specification, or can be implemented by a combination of special hardware and computer instructions.

Claims

1. A method for detecting a fault in an electric heating device of an air conditioner, characterized in that: include: In the electric heating mode, obtaining a first operating current of the air conditioner in a first detection cycle and a second operating current of the air conditioner in a second detection cycle, where the first detection cycle is adjacent to the second detection cycle and the second detection cycle is after the first detection cycle; wherein the first operating current and the second operating current are a total current of the air conditioner; Obtaining a first current difference between the first operating current and the second operating current; When the first current difference is greater than or equal to the first preset current for a duration greater than or equal to the fault determination duration, it is determined that the electric heating device of the air conditioner has a fault; wherein the first preset current is determined by: obtaining a second indoor fan speed of the air conditioner in the second detection period; when the absolute value of the speed difference between the first indoor fan speed and the second indoor fan speed is less than or equal to the preset speed, obtaining a current coefficient corresponding to the second indoor fan speed; wherein the current coefficient is positively correlated with the second indoor fan speed; determining the first preset current based on a first product of the nominal current of the electric heating device and the current coefficient; wherein the first preset current is positively correlated with the first product; Determining the first preset current based on a first product of a nominal current of the electric heating device and the current coefficient includes: obtaining a first compressor frequency of the air conditioner during the first detection period and a second compressor frequency during the second detection period; determining a frequency correction current based on a frequency difference between the first compressor frequency and the second compressor frequency; and determining the sum of the frequency correction current and the first product as the first preset current; The method of determining the frequency correction current based on the frequency difference between the first compressor frequency and the second compressor frequency includes: obtaining the rated current and rated frequency of the air conditioner compressor; obtaining the ratio of the frequency difference to the rated frequency; and determining the frequency correction current based on a second product of the rated current and the ratio; wherein the frequency correction current is positively correlated with the rated current, and the frequency correction current is positively correlated with the ratio.

2. The fault detection method according to claim 1, characterized in that: The obtaining of the current coefficient corresponding to the second indoor fan speed includes: Obtaining a first indoor fan speed of the air conditioner in the first detection cycle; According to the correspondence between the rotation speed and the coefficient, a first current coefficient corresponding to the rotation speed of the first indoor fan and a second current coefficient corresponding to the rotation speed of the second indoor fan are obtained; The current coefficient is determined as the difference between the second current coefficient and the first current coefficient and the sum of the coefficients of the second current coefficient.

3. The fault detection method according to claim 1 or 2, characterized in that: Also includes: When the duration during which the first current difference is greater than or equal to the first preset current is less than the fault determination duration, obtaining a third operating current of the air conditioner in a third detection cycle and a fourth operating current in a fourth detection cycle; wherein the third detection cycle and the fourth detection cycle are adjacent, the fourth detection cycle is after the third detection cycle, and the third detection cycle is after the second detection cycle; Obtaining a second current difference between the fourth operating current and the third operating current; If the second current difference is greater than or equal to a second preset current, it is determined that the electric heating device is operating normally; wherein the second preset current is greater than or equal to the first preset current.

4. The fault detection method according to claim 1 or 2, characterized in that: Also includes: When the first current difference is greater than or equal to the first preset current and the duration is greater than or equal to the abnormality determination duration, it is determined that the electric heating device has an abnormality; The abnormality determination time is shorter than the fault determination time.

5. A fault detection device for an air-conditioning electric heating device, characterized in that: include: A first obtaining module is configured to obtain, in the electric heating mode, a first operating current of the air conditioner in a first detection cycle and a second operating current of the air conditioner in a second detection cycle, wherein the first detection cycle is adjacent to the second detection cycle and the second detection cycle is located after the first detection cycle; wherein the first operating current and the second operating current are a total current of the air conditioner; a second obtaining module, configured to obtain a first current difference between the first operating current and the second operating current; a first determining module configured to determine that a fault occurs in the electric heating device of the air conditioner if the first current difference is greater than or equal to a first preset current for a duration that is greater than or equal to a fault determination duration; The first preset current is determined by: obtaining a second indoor fan speed of the air conditioner during the second detection period; obtaining a current coefficient corresponding to the second indoor fan speed when the absolute value of the speed difference between the first indoor fan speed and the second indoor fan speed is less than or equal to the preset speed; wherein the current coefficient is positively correlated with the second indoor fan speed; and determining the first preset current based on a first product of a nominal current of the electric heating device and the current coefficient; wherein the first preset current is positively correlated with the first product. Determining the first preset current based on a first product of a nominal current of the electric heating device and the current coefficient includes: obtaining a first compressor frequency of the air conditioner during the first detection period and a second compressor frequency during the second detection period; determining a frequency correction current based on a frequency difference between the first compressor frequency and the second compressor frequency; and determining the sum of the frequency correction current and the first product as the first preset current; The method of determining the frequency correction current based on the frequency difference between the first compressor frequency and the second compressor frequency includes: obtaining the rated current and rated frequency of the air conditioner compressor; obtaining the ratio of the frequency difference to the rated frequency; and determining the frequency correction current based on a second product of the rated current and the ratio; wherein the frequency correction current is positively correlated with the rated current, and the frequency correction current is positively correlated with the ratio.

6. A fault detection device for an air conditioner electric heating device, comprising a processor and a memory storing program instructions, characterized in that: The processor is configured to execute the fault detection method for the air-conditioning electric heating device according to any one of claims 1 to 4 when executing the program instructions.

7. A smart air conditioner, characterized in that: The invention comprises a fault detection device for an electric heating device for an air conditioner as claimed in claim 5 or 6.

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