Anomaly detection method and device of electric appliance, electric appliance and storage medium

Abstract

The invention discloses an electric appliance anomaly detection method and device, an electric appliance and a storage medium, and the method comprises the steps: obtaining the working current and working voltage of a working load in the electric appliance under the condition that the electric appliance is in a running state; based on the working current and the working voltage, determining the power consumption of the working load in a specified time period; determining a fault type of the workload based on the power consumption and a preset first mapping relation; the first mapping relationship represents a corresponding relationship between different power consumptions and different fault types. When the electric appliance is in the running state, the fault type of the working load can be determined by acquiring the related parameters of the working load, early troubleshooting of the fault load in the electric appliance is realized, the maintenance difficulty of the electric appliance is reduced, and the maintenance cost is saved.

Description

Technical Field

[0001] The present application relates to the technical field of electrical equipment, and more specifically, to an abnormality detection method and device for an electrical appliance, an electrical appliance, and a storage medium. Background Art

[0002] In daily use of electrical appliances, users or maintenance personnel often check the specific problems of the faulty load only when the load (e.g., motor or sensor) in the electrical appliance fails and the electrical appliance cannot function properly. In this case, the load often has a serious fault, making it more difficult to repair the electrical appliance.

[0003] Therefore, it is best for R&D personnel to troubleshoot possible load faults in the early stages of a fault. Summary of the invention

[0004] Embodiments of the present application provide an abnormality detection method and device for an electrical appliance, an electrical appliance, and a storage medium.

[0005] In a first aspect, some embodiments of the present application provide a method for detecting an abnormality of an electrical appliance, the method comprising: when the electrical appliance is in operation, obtaining a working current and a working voltage of a workload in the electrical appliance; determining the power consumption of the workload in a specified time period based on the working current and the working voltage; determining a fault type of the workload based on the power consumption and a preset first mapping relationship; the first mapping relationship characterizing the correspondence between different power consumptions and different fault types.

[0006] In a second aspect, some embodiments of the present application further provide an abnormality detection device for an electrical appliance, the device comprising an acquisition module, a first determination module, and a second determination module. The acquisition module is used to acquire the working current and working voltage of the workload in the electrical appliance when the electrical appliance is in operation. The first determination module is used to determine the power consumption of the workload in a specified time period based on the working current and the working voltage. The second determination module is used to determine the fault type of the workload based on the power consumption and a preset first mapping relationship; the first mapping relationship characterizes the correspondence between different power consumptions and different fault types.

[0007] In a third aspect, some embodiments of the present application further provide an electrical appliance, the electrical appliance comprising one or more processors, a memory, and one or more applications, wherein the one or more applications are stored in the memory and configured to be executed by the one or more processors, and the one or more applications are configured to execute the above-mentioned anomaly detection method.

[0008] In a fourth aspect, some embodiments of the present application further provide a computer-readable storage medium, in which computer program instructions are stored. The computer program instructions can be called by a processor to execute the above-mentioned anomaly detection method.

[0009] In a fifth aspect, some embodiments of the present application also provide a computer program product, which implements the above-mentioned anomaly detection method when executed.

[0010] The present application provides an abnormality detection method, device, appliance and storage medium for an electrical appliance. When the electrical appliance is in operation, the method determines the power consumption of the workload in a specified time period by obtaining the working current and working voltage of the workload in the electrical appliance, and then determines the fault type of the workload based on the power consumption and a preset first mapping relationship. Since the power consumption of the workload can reflect the current working state of the workload to a certain extent, for example, when the power consumption is too large, it indicates that the workload may have a fault, and the possible fault type of the workload can be determined through the first mapping relationship.

[0011] Therefore, when the appliance is in operation, the present application can determine the fault type of the workload by obtaining relevant parameters of the workload, thereby achieving early detection of faulty loads in the appliance, thereby reducing the difficulty of repairing the appliance and saving repair costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0013] Figure 1 It is a schematic diagram of the structure of an electrical appliance provided in an embodiment of the present application.

[0014] Figure 2 It is a schematic diagram of the working process of the mobile air purifier provided in the embodiment of the present application.

[0015] Figure 3 It is a flowchart of an abnormality detection method for an electrical appliance provided in the first embodiment of the present application.

[0016] Figure 4 It is a flowchart of an abnormality detection method for an electrical appliance provided in the second embodiment of the present application.

[0017] Figure 5 It is a flowchart of an abnormality detection method for an electrical appliance provided in the third embodiment of the present application.

[0018] Figure 6 It is a schematic diagram of the working current change trend of the workload provided in an embodiment of the present application.

[0019] Figure 7 It is a schematic diagram of the rotation speed variation trend of the workload provided in an embodiment of the present application.

[0020] Figure 8 It is a flowchart of an abnormality detection method for an electrical appliance provided in the fourth embodiment of the present application.

[0021] Fig. 9 It is a module block diagram of the control device of the electrical appliance provided in the embodiment of the present application.

[0022] Fig.10 This is a module block diagram of the electrical appliance provided in an embodiment of the present application.

[0023] Fig.11 It is a module block diagram of the computer-readable storage medium provided in an embodiment of the present application. DETAILED DESCRIPTION

[0024] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0025] In order to enable those skilled in the art to better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application.

[0026] The present application provides an abnormality detection method, device, appliance and storage medium for an electrical appliance. When the electrical appliance is in operation, the method determines the power consumption of the workload in a specified time period by obtaining the working current and working voltage of the workload in the electrical appliance, and then determines the fault type of the workload based on the power consumption and a preset first mapping relationship. Since the power consumption of the workload can reflect the current working state of the workload to a certain extent, when the power consumption is too large, it indicates that the workload may have a fault, and then the possible fault type of the workload can be determined through the first mapping relationship.

[0027] Therefore, when the appliance is in operation, the present application can determine the fault type of the workload by obtaining relevant parameters of the workload, thereby achieving early detection of faulty loads in the appliance, thereby reducing the difficulty of repairing the appliance and saving repair costs.

[0028] In order to facilitate the detailed description of the present application, the application environment of the present application embodiment is first introduced in conjunction with the accompanying drawings. Figure 1 The present application embodiment provides an electrical appliance 100, which refers to a device that works by electric energy. Specifically, the electrical appliance 100 may be a movable robot, such as a mobile air purifier, a sweeping robot, or a food delivery robot, or may be other household appliances with built-in batteries, such as a portable fan, which is not specifically limited in the present embodiment. The following description takes the electrical appliance 100 as a mobile air purifier as an example.

[0029] The mobile air purifier may include a controller 10 and a workload 20, which are electrically connected to process acquired signals or data and generate corresponding control instructions to control the workload 20 to work. Specifically, the controller 10 may be a control circuit or a control chip.

[0030] The workload 20 is an execution device in the mobile air purifier, which is used to realize different equipment functions. Among them, the workload 20 may include a motor load 210 and a fan load 230. The motor load 210 can be connected to the wheel 12 of the mobile air purifier in a transmission manner, and is used to drive the wheel 12 to rotate when the mobile air purifier is in the traveling stage. Specifically, the motor load 210 can be electrically connected to the controller 10, and the controller 10 can store the working parameters of the motor load 210 (for example, motor speed, operating time, etc.). The motor load 210 enables the mobile air purifier to move according to a preset purification path under the control of the controller 10. Specifically, the motor load 210 can be a stepper motor, a stepper motor, a brushless motor, etc., which is not specifically limited in this embodiment.

[0031] The fan load 230 is used to purify the air in the space where the mobile air purifier is located when the mobile air purifier is in the purification stage. Specifically, the fan load 230 can draw air from the air inlet 14 into the interior of the mobile air purifier, and then adsorb foreign matter such as dust in the air through the internal fan filter (not shown in the figure), and discharge the purified air through the air outlet 16. Similarly, the fan load 230 can be electrically connected to the controller 10, and the controller 10 can store the working parameters of the fan load 230 (for example, fan wind speed, purification time, etc.), and the fan load 230 purifies the air in the space under the control of the controller 10. Specifically, the fan load 230 can be an axial flow fan, a centrifugal fan, etc., which is not specifically limited in this embodiment.

[0032] See also Figure 2 , Figure 2 A schematic diagram of the working process of a mobile air purifier provided by the present embodiment is shown, wherein a purification path may be pre-set in the controller 10, and the purification path may include multiple purification points (for example, purification point A, purification point B, purification point N, etc.), and the controller 10 needs to control the mobile air purifier to move between different purification points. At this time, the mobile air purifier is in the traveling stage, and the motor load 210 is in the working state. When the mobile air purifier moves to the purification point, the controller 10 controls the mobile air purifier to enter the purification stage, and the fan load 230 is in the working state. When the mobile air purifier completes the purification path, it will return to the charging pile, and the mobile air purifier is in the charging stage.

[0033] In this embodiment, the mobile air purifier may further include a sensor module 30, and the sensor module 30 is used to obtain working parameters of the mobile air purifier in an operating state or environmental parameters of a space where the mobile air purifier is located.

[0034] In some possible embodiments, the sensor module 30 may include a current sensor and a voltage sensor, which are respectively connected between the controller 10 and the workload 20, the current sensor is used to obtain the working current of the workload 20, and the voltage sensor is used to obtain the working voltage of the workload 20. Specifically, the current sensor may be a shunt, an electromagnetic current transformer, an electronic current transformer, etc., and the voltage sensor may be a voltage transformer, a Hall voltage sensor, an optical fiber voltage sensor, etc.

[0035] In some other possible embodiments, the sensor module 30 may also include an air quality sensor, which is connected to the controller 10 and is used to detect the concentration of pollutants (e.g., formaldehyde, PM2.5, etc.) in the space where the mobile air purifier is located. The controller 10 may control the working mode of the fan load 230 based on the above pollutant concentration. Specifically, the air quality sensor may be an electrochemical gas sensor, a mass gas sensor, etc., and this embodiment does not limit the specific implementation of the sensor module 30.

[0036] See also Figure 3 , which shows a method for detecting abnormality of an electrical appliance provided by the first embodiment of the present application. Specifically, the method may include the following steps.

[0037] Step S310, when the electrical appliance is in operation, obtaining the operating current and the operating voltage of the load in the electrical appliance.

[0038] In this embodiment, the controller can obtain the working current and working voltage of the workload in the electrical appliance at preset time intervals when the electrical appliance is in operation. The preset time may be a default value in the controller, wherein the preset time may be greater than or equal to 1s and less than or equal to 10min, for example, the preset time may be 30s, 1min, 5min, etc. The preset time may also be adjusted by the R&D personnel based on the actual working conditions of the electrical appliance, and this embodiment does not specifically limit this.

[0039] In some possible embodiments, the electrical appliance includes multiple working stages during operation, and different working stages correspond to different workloads.

[0040] As an implementation method, the controller can first determine the current working stage of the appliance, and then obtain the working current and working voltage of the workload corresponding to the working stage. Taking the appliance as a mobile air purifier as an example, the working stage of the mobile air purifier may include a traveling stage and a purification stage. The controller can determine the current working stage by querying the working stage flag of the mobile air purifier, and then obtain the working current and working voltage of the workload corresponding to the working stage. Exemplarily, the working stage flag can be a binary character. If the value of the binary character is 0, the controller determines that the mobile air purifier is in the traveling stage, and then obtains the working current and working voltage of the motor load; if the value of the binary character is 1, the controller determines that the mobile air purifier is in the purification stage, and then obtains the working current and working voltage of the fan load.

[0041] As another implementation, the controller can directly obtain the working status of multiple workloads, and if the working status is on, the working current and working voltage of the workload are obtained. Also, taking the electrical appliance as a mobile air purifier as an example, the controller can determine the workload that is currently in the on state by querying the corresponding working status flags of the motor load and the fan load, and then obtain the working current and working voltage of the workload. Exemplarily, the working status flag can be a binary character. If the value of the binary character is 0, the controller determines that the corresponding workload is in the off state; if the value of the binary character is 1, the controller determines that the corresponding workload is in the on state.

[0042] Step S320, determining the power consumption of the workload in a specified time period based on the operating current and the operating voltage.

[0043] In this embodiment, the power consumption of the workload in the specified time period can be calculated based on the working current, the working voltage and the duration corresponding to the specified time period. Specifically, the calculation formula of the power consumption is as follows.

[0044] ΔW=U*I*ΔT.

[0045] Wherein, ΔW is the power consumption of the workload in the specified time period, U is the working voltage, I is the working current, and ΔT is the duration corresponding to the specified time period. Wherein, the duration corresponding to the specified time period may be a default value in the controller, wherein the duration corresponding to the specified time period may be greater than or equal to 1s and less than or equal to 10min, for example, the preset duration may be 1s, 10s, 1min, etc. The duration corresponding to the specified time period may also be adjusted by the R&D personnel based on the actual working conditions of the electrical appliance, and this embodiment does not specifically limit this.

[0046] In other embodiments, the working current and working voltage of the workload may include multiple sampling values ​​in a specified time period, respectively. Taking the current as an example, the working current may include multiple current sampling values ​​in a specified time period, and the controller may determine the average of the multiple current sampling values ​​as the working current, thereby avoiding errors in the power consumption calculation when the current is unstable, and improving the accuracy of subsequent fault type judgment. Similarly, the controller may determine the average of multiple voltage sampling values ​​as the working voltage, thereby avoiding errors in the power consumption calculation when the voltage is unstable.

[0047] Step S330: determining the fault type of the workload based on the power consumption and a preset first mapping relationship.

[0048] In this embodiment, the first mapping relationship represents the correspondence between different power consumptions and different fault types. The first mapping relationship may be a mapping table, which may be obtained by summarizing the power consumption data collected by R&D personnel when the appliance is in different fault conditions. The controller may determine the fault type of the workload by searching the above mapping table based on the currently collected power consumption data. It is not difficult to understand here that in some possible scenarios, if the controller cannot determine the fault type of the workload by searching the mapping table, it means that the workload is in a normal working state.

[0049] The present application provides an abnormality detection method for an electrical appliance. When the electrical appliance is in operation, the method determines the power consumption of the workload in a specified time period by obtaining the working current and working voltage of the workload in the electrical appliance, and then determines the fault type of the workload based on the power consumption and a preset first mapping relationship. Since the power consumption of the workload can reflect the current working state of the workload to a certain extent, when the power consumption is too large, it indicates that the workload may have a fault, and then the possible fault type of the workload can be determined through the first mapping relationship.

[0050] Therefore, when the appliance is in operation, the present application can determine the fault type of the workload by obtaining relevant parameters of the workload, thereby achieving early detection of faulty loads in the appliance, thereby reducing the difficulty of repairing the appliance and saving repair costs.

[0051] See also Figure 4 , which shows an abnormality detection method for an electrical appliance provided in the second embodiment of the present application. In this embodiment, the working load of the electrical appliance may include a motor load and / or a fan load. Specifically, the method may include the following steps.

[0052] Step S410, when the electrical appliance is in operation, obtaining the operating current and the operating voltage of the load in the electrical appliance.

[0053] Step S420, determining the power consumption of the workload in a specified time period based on the operating current and the operating voltage.

[0054] The specific implementation of step S410 and step S420 can refer to the relevant introduction in the above-mentioned step S310 and step S320, which will not be repeated here.

[0055] Step S430: determining the fault type of the workload based on the power consumption and a preset first mapping relationship.

[0056] In some possible embodiments, the workload may include a motor load, the first mapping relationship may include a first fault type mapping table, and step S430 may include step S4300.

[0057] Step S4300: determining the fault type of the motor load based on the power consumption and the first fault type mapping table.

[0058] In this embodiment, the fault type may include motor failure and electrical load. Among them, "electrical load" means that other sundries are placed on the body of the electrical appliance, which increases the weight of the electrical appliance itself, thereby increasing the power consumption of the motor load during operation. "Motor failure" can be a mechanical failure (for example, wheel failure, bearing overheating, friction between the stator and the rotor, etc.), or an electrical failure (for example, short circuit of the stator and rotor windings, short circuit of the wiring, etc.). The above faults will also cause the power consumption of the motor load to increase during operation. This embodiment does not limit the specific cause of the motor failure.

[0059] Specifically, when the controller determines that the working stage of the electrical appliance is the traveling stage or that the motor load is in the on state, the controller determines the fault type of the motor load based on the power consumption and the first fault type mapping table. The first fault type mapping table can be obtained by summarizing the power consumption data collected by the R&D personnel when the motor load is in different fault conditions. The controller can determine the fault type of the motor load by searching the above-mentioned first fault type mapping table.

[0060] As an implementation manner, the first fault type mapping table represents the correspondence between different first power consumption intervals and different fault types of the motor load, and step S4300 may include step S4301 and step S4305.

[0061] Step S4301, determining a first power consumption interval in which the power consumption lies.

[0062] In this embodiment, the first power consumption interval may include a first interval and a second interval. The first interval may include one or more sub-intervals, or include one or more discrete values. Similarly, the second interval may also include one or more sub-intervals, or include one or more discrete values. This embodiment does not limit the specific interval ranges of the first interval and the second interval.

[0063] In some possible embodiments, the actual value of power consumption when the appliance is loaded is greater than the actual value when the motor fails, so the lower limit of the second interval is greater than or equal to the upper limit of the first interval. Please refer to Table 1, which schematically provides a first fault type mapping table.

[0064] Table-1

[0065] First power consumption range / kWh [0.2，0.5) [0.5，0.8) Motor load fault types Motor failure Electrical load

[0066] Among them, the first interval is [0.2, 0.5), and the second interval is [0.5, 0.8). The controller determines the first power consumption interval where the power consumption is located by obtaining the specific interval ranges of the first interval and the second interval. It is not difficult to understand here that in some possible scenarios, the power consumption may neither belong to the first interval nor to the second interval, which means that the motor load is in normal working condition.

[0067] Step S4303: when the first power consumption interval is the first interval, determining that the fault type of the motor load is a motor fault.

[0068] Step S4305: when the first power consumption interval is the second interval, determining that the fault type of the motor load is electrical appliance load.

[0069] In this embodiment, the controller determines that the fault type of the motor load is a motor fault when the first power consumption interval is the first interval; and determines that the fault type of the motor load is an electrical appliance load when the first power consumption interval is the second interval.

[0070] In the subsequent process, when the controller determines the specific fault type of the motor load, it can generate corresponding fault alarm information and send the information to a mobile terminal (for example, a smart phone, tablet computer, etc.) that is connected to the electrical appliance to remind the user to repair the motor load in time to ensure the service life of the appliance.

[0071] In some possible embodiments, the controller may further include step A100 and step A200 before executing step S4300.

[0072] Step A100, obtaining the attitude angle of the electrical appliance.

[0073] In this embodiment, the attitude angle of the electrical appliance is used to characterize the angle information between the electrical appliance and the horizontal plane. Specifically, the attitude angle may include information such as the pitch angle, the roll angle, and the heading angle. As an implementation method, a gyroscope (e.g., a two-degree-of-freedom gyroscope, a three-degree-of-freedom gyroscope, etc.) may be configured inside the electrical appliance, and the gyroscope is electrically connected to the controller, and the controller can obtain the attitude angle of the electrical appliance through the gyroscope.

[0074] Step A200, when the attitude angle is less than or equal to the specified attitude angle, executing the step of determining the fault type of the motor load based on the power consumption and the first fault type mapping table.

[0075] In this embodiment, the specified attitude angle may be a default value in the controller, wherein the specified attitude angle may be greater than or equal to 0 degrees and less than or equal to 5 degrees, for example, the specified attitude angle may be 1 degree, 3 degrees, etc. The specified attitude angle may also be adjusted by the R&D personnel based on the actual working conditions of the electrical appliance, and this embodiment does not specifically limit this.

[0076] When the controller determines that the attitude angle is less than or equal to the specified attitude angle, it means that the appliance is traveling on a stable ground, and the influence of uneven ground or traveling on an uphill road on power consumption can be eliminated. In this case, the controller executes step S4300.

[0077] When the controller determines that the attitude angle is greater than the specified attitude angle, it means that the appliance is traveling on uneven ground or is going uphill. In this case, the excessive power consumption of the motor load may be caused by external road conditions. The controller does not execute step S4300, thereby reducing the probability of misjudging the motor load failure and ensuring the normal operation of the appliance.

[0078] In some other possible embodiments, the workload may include a wind turbine load, the first mapping relationship may include a second fault type mapping table, and step S430 may include step S4320.

[0079] Step S4320: Determine the fault type of the fan load based on the power consumption and the second fault type mapping table.

[0080] In this embodiment, the fault types include dust accumulation on the fan filter and sensor failure. Among them, "dust accumulation on the fan filter" will cause the air inlet to be blocked, which will increase the resistance of the air inlet, and increase the power consumption of the fan load when it is working. "Sensor failure" may be a problem with the air quality sensor itself, or it may be that the air quality sensor is not calibrated well, resulting in the air quality sensor being unable to accurately obtain air quality parameters, causing the fan load to be continuously in a working state, and the power consumption of the fan load when it is working increases.

[0081] Specifically, when the controller determines that the working stage of the output appliance is the purification stage or that the output fan load is in the on state, the controller determines the fault type of the fan load based on the power consumption and the second fault type mapping table. The second fault type mapping table can be obtained by summarizing the power consumption data collected by the R&D personnel when the fan load is in different fault conditions. The controller can determine the fault type of the output fan load by searching the above second fault type mapping table.

[0082] As an implementation manner, the second fault type mapping table represents the correspondence between different second power consumption intervals and different fault types of the fan load, and step S4320 may include step S4321 and step S4325.

[0083] Step S4321, determining the second power consumption interval in which the power consumption lies.

[0084] In this embodiment, the second power consumption interval may include a third interval and a fourth interval. The third interval may include one or more sub-intervals, or include one or more discrete values. Similarly, the fourth interval may also include one or more sub-intervals, or include one or more discrete values. This embodiment does not limit the specific interval ranges of the third interval and the fourth interval.

[0085] In some possible embodiments, the actual value of power consumption when the fan filter is dusty is greater than the actual value when the sensor fails, so the lower limit of the third interval is greater than or equal to the upper limit of the fourth interval. Please refer to Table 2, which schematically provides a second fault type mapping table.

[0086] Table-2

[0087] Second power consumption range / kWh [0.6，0.9) [0.3，0.6) Fault types of fan loads Dust accumulation on fan filter Sensor failure

[0088] Among them, the third interval is [0.6, 0.9), and the fourth interval is [0.3, 0.6). The controller determines the second power consumption interval where the power consumption is located by obtaining the specific interval ranges of the third interval and the fourth interval. It is not difficult to understand here that in some possible scenarios, the power consumption may not belong to the third interval or the fourth interval, which means that the fan load is in a normal working state.

[0089] Step S4323, when the second power consumption interval is the third interval, determining that the fault type of the fan load is dust accumulation on the fan filter.

[0090] Step S4324: when the second power consumption interval is the fourth interval, determining that the fault type of the fan load is a sensor fault.

[0091] In this embodiment, when the second power consumption interval is the third interval, the controller determines that the fault type of the fan load is dust accumulation on the fan filter; when the second power consumption interval is the fourth interval, the controller determines that the fault type of the fan load is a sensor fault.

[0092] In the subsequent process, when the controller determines the specific fault type of the fan load, it can generate corresponding fault alarm information and send the information to a mobile terminal (for example, a smart phone, tablet computer, etc.) that is connected to the appliance to remind the user to repair the fan load in time to ensure the service life of the appliance.

[0093] The present application provides a method for detecting an abnormality of an electrical appliance. The method describes how to determine the fault type of the motor load and the fault type of the fan load when the working load of the electrical appliance includes a motor load and / or a fan load, thereby achieving early detection of faulty loads in the electrical appliance, thereby reducing the difficulty of repairing the electrical appliance and saving repair costs.

[0094] See also Figure 5 , which shows a method for detecting abnormality of an electrical appliance provided by the third embodiment of the present application. Specifically, the method may include the following steps.

[0095] Step S510, when the electrical appliance is in operation, obtaining the operating current and the operating voltage of the load in the electrical appliance.

[0096] In this embodiment, the controller can first pre-judge the relevant parameters of the workload, and when it is determined that the above relevant parameters are abnormal, the power consumption of the workload is calculated by the working current and working voltage. After a large amount of experimental data, the R&D personnel found that when the workload is abnormal, the working current of the workload will be too large, and the actual speed of the workload will be too small. Specifically, the working current change trend of the workload can be referred to Figure 6 ,exist Figure 6 In FIG. 6 , the solid line 61 is a curve showing the change of the working current over time, and the dotted line 63 is a straight line representing the target current. Figure 6 It is not difficult to find that when the workload is abnormal, the working current of the workload will exceed the target current after a period of time. The actual speed change trend of the workload can be found in Figure 7 ,exist Figure 7 In FIG. 7 , the solid line 72 is a curve showing the actual speed changing with time, and the dotted line 74 is a straight line representing the target speed. Figure 7 It is not difficult to find that when there is an abnormality in the workload, the actual speed of the workload cannot reach the target speed.

[0097] Therefore, the controller can first determine whether the workload is abnormal based on the workload's operating current and / or actual speed, and then calculate the corresponding power consumption when an abnormality exists, so as to save the controller's computing resources and improve the controller's efficiency in detecting abnormalities. Specifically, in some possible embodiments, step S510 may include step S5100 and step S5120.

[0098] Step S5100, when the electrical appliance is in operation, obtaining the operating current of the workload in the electrical appliance.

[0099] The specific implementation of step S5100 can refer to the relevant introduction in the above step S310, which will not be repeated here.

[0100] Step S5120, when the working current is greater than the target current, obtaining the working voltage of the working load in the electrical appliance.

[0101] In this embodiment, the controller obtains the working voltage of the workload in the electrical appliance when the working current is greater than the target current. The target current refers to the rated current that the workload can reach during normal operation. The target current can be a default value in the controller or can be adjusted by the R&D personnel based on the actual working conditions of the electrical appliance. This embodiment does not specifically limit this. When the working current is less than or equal to the target current, the controller does not execute subsequent steps.

[0102] In some other possible embodiments, step S510 may include step S5140 and step S5160.

[0103] Step S5140: When the electrical appliance is in operation, a first rotation speed of the workload in the electrical appliance is obtained.

[0104] In this embodiment, when the appliance is in operation, the controller obtains the first speed of the workload in the appliance at specified time intervals. The specified time may be a default value in the controller, wherein the specified time may be greater than or equal to 1s and less than or equal to 10min, for example, the specified time may be 30s, 1min, 5min, and so on. The specified time may also be adjusted by the R&D personnel based on the actual working conditions of the appliance, and this embodiment does not specifically limit this. It is not difficult to understand here that when the workload is a motor load, the first speed is the actual speed of the motor load; when the workload is a fan load, the first speed is the actual speed of the fan load.

[0105] Step S5160, when the first rotation speed is less than the target rotation speed, the operating current and the operating voltage of the working load in the electrical appliance are obtained.

[0106] In this embodiment, the controller obtains the working current and working voltage of the workload in the electrical appliance when the first speed is less than the target speed. The target speed refers to the theoretical speed that the workload can reach during normal operation. The target speed can be a default value in the controller or can be adjusted by the R&D personnel based on the actual working conditions of the electrical appliance. This embodiment does not specifically limit this. When the first speed is greater than the target speed, the controller does not execute subsequent steps.

[0107] In some other possible embodiments, the controller can obtain the working current and the first speed of the workload in the appliance when the appliance is in operation, and obtain the working voltage of the workload in the appliance when the working current is greater than the target current and the first speed is less than the target speed.

[0108] The controller in this embodiment can first determine in advance whether there is an abnormality in the workload based on the working current and / or actual speed of the workload, and then calculate the corresponding power consumption when there is an abnormality in the working current and / or actual speed, so as to save the computing resources of the controller and improve the efficiency of the controller in abnormality detection.

[0109] Step S520: determining the power consumption of the workload in a specified time period based on the operating current and the operating voltage.

[0110] The specific implementation of step S520 can refer to the relevant introduction in the above step S320, which will not be repeated here.

[0111] Step S530: determining the fault type of the workload based on the power consumption and a preset first mapping relationship.

[0112] In this embodiment, the controller first determines the corresponding power consumption threshold based on the working parameters of the electrical appliance in the current working stage, and then determines the specific fault type of the workload based on the first mapping relationship when the workload is determined to be in an abnormal state based on the power consumption threshold, thereby saving the computing resources of the controller and improving the efficiency of the controller in detecting abnormalities. Specifically, step S530 may include step S5300 and step S5340.

[0113] Step S5300, obtaining the working parameters of the electrical appliance in the current working stage.

[0114] In this embodiment, the working parameters are used to describe the status of the appliance during the current operation, and the working parameters corresponding to different working stages are different. Taking the appliance as a mobile air purifier as an example, the working stages of the mobile air purifier may include a traveling stage and a purification stage. When the current working stage is the traveling stage, the corresponding working parameters may include the driving distance, driving speed, driving time, etc. When the current working stage is the purification stage, the corresponding working parameters may include the purification time, fan speed, ambient air quality, etc.

[0115] As an implementation method, the controller may first determine the current working stage of the appliance, and then obtain the working parameters corresponding to the working stage. Specifically, the implementation method of the controller determining the current working stage can refer to the relevant introduction in step S310, which will not be repeated here.

[0116] Step S5320: determining a power consumption threshold based on the working parameter and a preset third mapping relationship.

[0117] In this embodiment, the third mapping relationship represents the correspondence between different operating parameters and different power consumption thresholds, and the power consumption threshold represents the normal value of power consumption under the corresponding operating parameters. Exemplarily, when the operating parameters include driving distance, driving speed and driving duration, the third mapping relationship can represent the power consumption thresholds corresponding to different driving distances, different driving speeds and different driving durations. The third mapping relationship can be summarized by the R&D personnel from the power consumption data collected when the appliance is in different operating parameters. Specifically, the third mapping relationship is a mapping table, a mapping function, etc., and this embodiment does not make specific limitations on this. It is not difficult to understand here that the third mapping relationship can represent the power consumption threshold corresponding to a single operating parameter (for example, driving duration), or it can be the power consumption threshold corresponding to multiple operating parameters, so that the determined power consumption threshold is more accurate and reasonable.

[0118] Specifically, the controller can determine the corresponding power consumption threshold by querying the pre-stored third mapping relationship based on the acquired working parameters. Therefore, the power consumption threshold in this embodiment is determined based on the working parameters of the appliance during actual operation, so that the determined power consumption threshold is more accurate and reasonable, and conforms to the actual working conditions of the appliance.

[0119] Step S5340: When the power consumption is greater than or equal to the power consumption threshold, determine the fault type of the workload based on the power consumption and a preset first mapping relationship.

[0120] In this embodiment, the controller determines the fault type of the workload based on the power consumption and a preset first mapping relationship when the power consumption is greater than or equal to the power consumption threshold. The controller does not perform subsequent steps when the power consumption is less than the power consumption threshold.

[0121] Since the power consumption threshold in this embodiment refers to the normal value of the power consumption of the appliance under the corresponding working parameters, when the power consumption actually calculated by the controller is less than the power consumption threshold, it means that the appliance is in a normal operating state, and therefore there is no need to perform the subsequent steps of determining the fault type of the workload, thereby saving the computing resources of the controller and improving the efficiency of the controller in detecting abnormalities.

[0122] See also Figure 8 , which shows a method for detecting abnormality of an electrical appliance provided by the fourth embodiment of the present application. Specifically, the method may include the following steps.

[0123] Step S810, when the electrical appliance is in operation, obtaining the operating current and the operating voltage of the load in the electrical appliance.

[0124] In this embodiment, the controller can obtain the working current and working voltage of the workload when the workload is in a stable running state, thereby ensuring the accuracy of sampling the working current and working voltage, and avoiding the influence of external environmental noise on data acquisition when the workload is in an unstable state. Specifically, step S810 can include step S8100 and step S8120.

[0125] Step S8100: When the electrical appliance is in operation, a plurality of second rotational speeds of the workload in the electrical appliance are obtained.

[0126] In this embodiment, when the appliance is in operation, the controller obtains the second speed of the workload in the appliance at set time intervals. The set time may be a default value in the controller, wherein the set time may be greater than or equal to 1s and less than or equal to 1min, for example, the set time may be 10s, 20s, 30s, and so on. The set time may also be adjusted by the R&D personnel based on the actual working conditions of the appliance, and this embodiment does not specifically limit this. It is not difficult to understand here that when the workload is a motor load, the second speed is the actual speed of the motor load; when the workload is a fan load, the second speed is the actual speed of the fan load.

[0127] Step S8120: When the speed difference between any two second speeds among the plurality of second speeds is less than or equal to a specified difference, obtain the working current and the working voltage of the working load in the electrical appliance.

[0128] In this embodiment, the specified difference may be a default value in the controller, wherein the specified difference may be greater than or equal to 0 r / s and less than or equal to 10 r / s, for example, the specified difference may be 3 r / s, 5 r / s, etc. The specified difference may also be adjusted by R&D personnel based on the actual working conditions of the electrical appliance, and this embodiment does not specifically limit this.

[0129] When the controller determines that the speed difference between any two second speeds among the multiple second speeds is less than or equal to the specified difference, it means that the speed of the workload is stable. In this case, the working current and working voltage obtained can accurately reflect the operation of the workload, improving the accuracy of the fault type judgment. On the contrary, when the controller determines that the speed difference between the two second speeds is greater than the specified difference, it means that the workload is in an unstable state. At this time, the step of obtaining the working current and working voltage of the workload in the electrical appliance is not performed, which can avoid the influence of external environmental noise on data acquisition.

[0130] Step S820: determining the power consumption of the workload in a specified time period based on the operating current and the operating voltage.

[0131] In this embodiment, the controller will consider the influence of the actual power of the electrical appliance on the power consumption when calculating the power consumption, thereby making the calculated power consumption more accurate. Specifically, step S820 may include steps S8210 to S8270.

[0132] Step S8210, based on the operating current and the operating voltage, determine the estimated power consumption of the workload in a specified time period.

[0133] In this embodiment, the estimated power consumption of the workload in the specified time period can be calculated based on the working current, the working voltage and the duration corresponding to the specified time period. Specifically, the calculation formula for the estimated power consumption is as follows.

[0134] ΔW1=U*I*ΔT.

[0135] Wherein, ΔW1 is the estimated power consumption of the workload in the specified time period, U is the operating voltage, I is the operating current, and ΔT is the duration corresponding to the specified time period. Wherein, the duration corresponding to the specified time period may be a default value in the controller, wherein the duration corresponding to the specified time period may be greater than or equal to 1s and less than or equal to 10min, for example, the preset duration may be 1s, 10s, 1min, and so on. The duration corresponding to the specified time period may also be adjusted by the R&D personnel based on the actual working conditions of the electrical appliance, and this embodiment does not specifically limit this.

[0136] Step S8230, obtaining the actual power consumption of the appliance.

[0137] In this embodiment, the controller can obtain the actual power of the electrical appliance through an internal battery management system.

[0138] Step S8250: determining a power consumption compensation value based on the actual power consumption and a preset second mapping relationship.

[0139] In this embodiment, the second mapping relationship represents the correspondence between different actual power and different power consumption compensation values. The second mapping relationship may be a mapping table, which may be obtained by summarizing power consumption data collected by R&D personnel when the battery in the electrical appliance is in different conditions, or the mapping table may be calculated by R&D personnel based on the battery state of charge (SOC) curve.

[0140] As an implementation method, the second mapping relationship can reflect the correspondence between different power intervals and different power consumption compensation values. The controller first determines the power interval corresponding to the actual power of the appliance, and then determines the power consumption compensation value corresponding to the power interval through the second mapping relationship.

[0141] Step S8270, determining the power consumption based on the estimated power consumption and the power consumption compensation value.

[0142] In this embodiment, the controller determines the sum of the estimated power consumption and the power consumption compensation value as the power consumption. Specifically, the calculation formula of the power consumption is as follows.

[0143] ΔW=ΔW1+ΔW2.

[0144] Among them, ΔW is the power consumption of the workload in a specified time period, ΔW1 is the estimated power consumption, and ΔW2 is the power consumption compensation value.

[0145] Step S830: determining the fault type of the workload based on the power consumption and a preset first mapping relationship.

[0146] The specific implementation of step S830 can refer to the relevant introduction in the above step S430, which will not be repeated here.

[0147] The present application provides an abnormality detection method for an electrical appliance. When calculating power consumption, the controller takes into account the influence of the actual power consumption of the electrical appliance on the power consumption, thereby making the calculated power consumption more accurate and improving the accuracy of fault type judgment.

[0148] See also Fig. 9 , which shows an abnormality detection device 900 for an electrical appliance provided in an embodiment of the present application, and the device 900 may include an acquisition module 910, a first determination module 920, and a second determination module 930. Among them, the acquisition module 910 is used to obtain the working current and working voltage of the workload in the electrical appliance when the electrical appliance is in operation. The first determination module 920 is used to determine the power consumption of the workload in a specified time period based on the working current and the working voltage. The second determination module 930 is used to determine the fault type of the workload based on the power consumption and a preset first mapping relationship; the first mapping relationship represents the correspondence between different power consumptions and different fault types.

[0149] In some embodiments, the workload includes a motor load, and the first mapping relationship includes a first fault type mapping table. The second determination module 930 is specifically configured to determine the fault type of the motor load based on power consumption and the first fault type mapping table, and the fault types include motor fault and electrical load.

[0150] In some embodiments, the first fault type mapping table represents the correspondence between different first power consumption intervals and different fault types of the motor load. The second determination module 930 is specifically used to determine the first power consumption interval in which the power consumption is located; when the first power consumption interval is the first interval, determine that the fault type of the motor load is a motor fault; when the first power consumption interval is the second interval, determine that the fault type of the motor load is an electrical load.

[0151] In some embodiments, the workload includes fan load, and the first mapping relationship includes a second fault type mapping table. The second determination module 930 is specifically used to determine the fault type of the fan load based on power consumption and the second fault type mapping table, and the fault type includes dust accumulation on the fan filter and sensor failure.

[0152] In some embodiments, the second fault type mapping table represents the correspondence between different second power consumption intervals and different fault types of the fan load. The second determination module 930 is specifically used to determine the second power consumption interval in which the power consumption is located; when the second power consumption interval is the third interval, determine that the fault type of the fan load is dust accumulation on the fan filter; when the second power consumption interval is the fourth interval, determine that the fault type of the fan load is a sensor fault.

[0153] In some embodiments, the first determination module 920 is specifically used to determine the estimated power consumption of the workload in a specified time period based on the working current and the working voltage; obtain the actual power of the electrical appliance; determine the power consumption compensation value based on the actual power and a preset second mapping relationship; the second mapping relationship represents the correspondence between different actual power and different power consumption compensation values; and determine the power consumption based on the estimated power consumption and the power consumption compensation value.

[0154] In some embodiments, the second determination module 930 is specifically used to obtain the working parameters of the electrical appliance in the current working stage; determine the power consumption threshold based on the working parameters and a preset third mapping relationship; the third mapping relationship represents the correspondence between different working parameters and different power consumption thresholds, and the power consumption threshold represents the normal value of the power consumption under the corresponding working parameters; when the power consumption is greater than or equal to the power consumption threshold, determine the fault type of the workload based on the power consumption and the preset first mapping relationship.

[0155] In some embodiments, the acquisition module 910 is specifically used to acquire the working current of the workload in the appliance when the appliance is in operation; and to acquire the working voltage of the workload in the appliance when the working current is greater than the target current.

[0156] In some embodiments, the acquisition module 910 is specifically used to acquire a first rotational speed of the workload in the appliance when the appliance is in operation; and to acquire a working current and a working voltage of the workload in the appliance when the first rotational speed is less than a target rotational speed.

[0157] In some embodiments, the acquisition module 910 is specifically used to acquire multiple second speeds of the workload in the appliance when the appliance is in operation; and to acquire the working current and working voltage of the workload in the appliance when the speed difference between any two second speeds among the multiple second speeds is less than or equal to a specified difference.

[0158] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described devices and modules can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here.

[0159] In several embodiments provided in the present application, the coupling between modules may be electrical, mechanical or other forms of coupling.

[0160] In addition, each functional module in each embodiment of the present application can be integrated into a control module, or each module can exist physically separately, or two or more modules can be integrated into one module. The above integrated modules can be implemented in the form of hardware or software functional modules.

[0161] The present application provides an abnormality detection device for an electrical appliance, which, when the electrical appliance is in operation, determines the power consumption of the workload in a specified time period by acquiring the working current and working voltage of the workload in the electrical appliance, and then determines the fault type of the workload based on the power consumption and a preset first mapping relationship. Since the power consumption of the workload can reflect the current working state of the workload to a certain extent, when the power consumption is too large, it indicates that the workload may have a fault, and then the possible fault type of the workload can be determined through the first mapping relationship.

[0162] Therefore, when the appliance is in operation, the present application can determine the fault type of the workload by obtaining relevant parameters of the workload, thereby achieving early detection of faulty loads in the appliance, thereby reducing the difficulty of repairing the appliance and saving repair costs.

[0163] See also Fig.10 , which shows that the embodiment of the present application also provides an electrical appliance 1000, which includes: one or more processors 1010, a memory 1020, and one or more applications. Among them, the one or more applications are stored in the memory and are configured to be executed by one or more processors, and the one or more applications are configured to execute the above method.

[0164] The processor 1010 may include one or more processing cores. The processor 1010 uses various interfaces and lines to connect various parts of the entire battery management system, and executes various functions and processes data of the battery management system by running or executing instructions, programs, code sets or instruction sets stored in the memory 1020, and calling data stored in the memory 1020. Optionally, the processor 1010 can be implemented in at least one hardware form of digital signal processing (DSP), field programmable gate array (FPGA), and programmable logic array (PLA). The processor 1010 can integrate one or more combinations of a central processing unit 1010 (CPU), a graphics processing unit 1010 (GPU), and a modem. Among them, the CPU mainly processes the operating system, user interface, and application programs; the GPU is responsible for rendering and drawing display content; and the modem is used to process wireless communications. It can be understood that the above-mentioned modem may not be integrated into the processor 1010, but may be implemented separately through a communication chip.

[0165] The memory 1020 may include a random access memory 1020 (Random Access Memory, RAM), and may also include a read-only memory 1020 (Read-Only Memory, ROM). The memory 1020 may be used to store instructions, programs, codes, code sets, or instruction sets. The memory 1020 may include a program storage area and a data storage area, wherein the program storage area may store instructions for implementing an operating system, instructions for implementing at least one function (such as a touch function, a sound playback function, an image playback function, etc.), instructions for implementing the various method embodiments described below, etc. The data storage area may also store data created by the electronic device during use (such as a phone book, audio and video data, chat record data), etc.

[0166] See also Fig.11 , Fig.11 It is schematically shown that an embodiment of the present application further provides a computer-readable storage medium 1100, in which computer program instructions 1110 are stored. The computer program instructions 1110 can be called by a processor to execute the method described in the above embodiment.

[0167] The computer-readable storage medium 1100 may be, for example, a flash memory, an electrically erasable programmable read-only memory (EEPROM), an electrically programmable read-only memory (EPROM), a hard disk, or a read-only memory (ROM). Optionally, the computer-readable storage medium includes a non-transitory computer-readable storage medium. The computer-readable storage medium 1100 has a storage space for computer program instructions 1110 for executing any method steps of the above method. These computer program instructions 1110 can be read from one or more computer program products or can be written into one or more computer program products.

[0168] The above are only preferred embodiments of the present application, and are not intended to limit the present application in any form. Although the present application has been disclosed as above with preferred embodiments, it is not intended to limit the present application. Any technical personnel in the field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present application. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A method for detecting abnormality of an electrical appliance, characterized in that: include: When the electrical appliance is in operation, obtaining the working current and working voltage of the working load in the electrical appliance; Determining the power consumption of the workload in a specified time period based on the operating current and the operating voltage; Based on the power consumption and a preset first mapping relationship, the fault type of the workload is determined; the first mapping relationship represents the correspondence between different power consumptions and different fault types.

2. The method according to claim 1, characterized in that The workload includes a motor load, the first mapping relationship includes a first fault type mapping table, and determining the fault type of the workload based on the power consumption and the preset first mapping relationship includes: Based on the power consumption and the first fault type mapping table, the fault type of the motor load is determined, and the fault type includes motor fault and electrical appliance load.

3. The method according to claim 2, characterized in that The first fault type mapping table represents the correspondence between different first power consumption intervals and different fault types of the motor load, and determining the fault type of the motor load based on the power consumption and the first fault type mapping table includes: Determine a first power consumption interval in which the power consumption falls; When the first power consumption interval is the first interval, determining that the fault type of the motor load is the motor fault; When the first power consumption interval is the second interval, it is determined that the fault type of the motor load is the electrical appliance load.

4. The method according to claim 1, characterized in that: The workload includes a fan load, the first mapping relationship includes a second fault type mapping table, and the determining the fault type of the workload based on the power consumption and the preset first mapping relationship includes: Based on the power consumption and the second fault type mapping table, the fault type of the fan load is determined, and the fault type includes dust accumulation on a fan filter and sensor failure.

5. The method according to claim 4, characterized in that The second fault type mapping table represents the correspondence between different second power consumption intervals and different fault types of the fan load, and determining the fault type of the fan load based on the power consumption and the second fault type mapping table includes: Determine a second power consumption interval in which the power consumption falls; When the second power consumption interval is the third interval, determining that the fault type of the fan load is dust accumulation on the fan filter; When the second power consumption interval is the fourth interval, it is determined that the fault type of the fan load is the sensor fault.

6. The method according to any one of claims 1 to 5, characterized in that The determining, based on the operating current and the operating voltage, the power consumption of the workload in a specified time period includes: Determining an estimated power consumption of the workload in a specified time period based on the operating current and the operating voltage; Obtaining actual power consumption of the electrical appliance; Determine the power consumption compensation value based on the actual power and a preset second mapping relationship; the second mapping relationship represents the correspondence between different actual power and different power consumption compensation values; The power consumption is determined based on the estimated power consumption and the power consumption compensation value.

7. The method according to any one of claims 1 to 5, characterized in that The determining the fault type of the workload based on the power consumption and a preset first mapping relationship includes: Obtaining working parameters of the electrical appliance in the current working stage; Based on the working parameters and a preset third mapping relationship, determining a power consumption threshold; the third mapping relationship represents a correspondence between different working parameters and different power consumption thresholds, and the power consumption threshold represents a normal value of power consumption under the corresponding working parameters; When the power consumption is greater than or equal to the power consumption threshold, the fault type of the workload is determined based on the power consumption and a preset first mapping relationship.

8. The method according to any one of claims 1 to 5, characterized in that When the electrical appliance is in operation, obtaining the operating current and the operating voltage of the workload in the electrical appliance includes: When the electrical appliance is in operation, obtaining a working current of a workload in the electrical appliance; when the working current is greater than a target current, obtaining a working voltage of the workload in the electrical appliance; or When the electrical appliance is in operation, a first rotational speed of a workload in the electrical appliance is obtained; when the first rotational speed is less than a target rotational speed, an operating current and an operating voltage of the workload in the electrical appliance are obtained.

9. The method according to any one of claims 1 to 5, characterized in that When the electrical appliance is in operation, obtaining the operating current and the operating voltage of the workload in the electrical appliance includes: When the electrical appliance is in operation, obtaining a plurality of second rotation speeds of a workload in the electrical appliance; When a speed difference between any two second speeds among the plurality of second speeds is less than or equal to a specified difference, an operating current and an operating voltage of a workload in the electrical appliance are obtained.

10. An abnormality detection device for an electrical appliance, characterized in that: include: An acquisition module, used for acquiring a working current and a working voltage of a workload in the electrical appliance when the electrical appliance is in operation; A first determination module, configured to determine the power consumption of the workload in a specified time period based on the working current and the working voltage; The second determination module is used to determine the fault type of the workload based on the power consumption and a preset first mapping relationship; the first mapping relationship represents the correspondence between different power consumptions and different fault types.

11. An electrical appliance, characterized in that: The electrical appliance comprises: one or more processors; Memory; One or more applications, wherein one or more of the applications are stored in the memory and configured to be executed by one or more of the processors, and one or more of the applications are configured to execute the method according to any one of claims 1-9.

12. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer program instructions, and the computer program instructions can be called by a processor to execute the method according to any one of claims 1 to 9.

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