A method for detecting abnormal installation of a wall-mounted drum washing machine and the washing machine itself.

Abstract

This invention relates to a method for detecting installation abnormalities in a wall-mounted drum washing machine and the washing machine itself. In the detection method, the washing machine determines whether it has detached from the wall based on changes in reflected light signals received by a photoelectric sensor. The photoelectric sensor emits light along the axial and / or radial direction of the washing machine drum towards a reflective object and receives the reflected light. This invention, based on existing optical detection methods, further incorporates instantaneous judgment of the washing machine's detachment status to prevent obstructions in the surrounding environment from mistakenly triggering optical signals and causing the washing machine to unexpectedly stop.

Description

Technical Field

[0001] This invention belongs to the field of washing machine technology, specifically, it relates to a method for detecting abnormal installation of a wall-mounted drum washing machine and the washing machine itself. Background Technology

[0002] Compared to floor-mounted washing machines, wall-mounted drum washing machines have advantages such as taking up less space, being easy to operate, being suitable for single people, and saving resources.

[0003] Wall-mounted drum washing machines need to be installed on the wall, but improper installation or prolonged vibration may cause the washing machine to detach from the wall. Therefore, real-time monitoring of the washing machine's status is necessary. Current detection methods include using optical sensors or emitting lasers and determining whether the wall-mounted washing machine has detached based on the reflected signals.

[0004] However, due to the special nature of optical sensors and light propagation, when there are obstacles between the sensor and the wall, ceiling, or floor for a short period of time, such as the user's body, a pet running through the light range, or an object placed there, the change in the light signal may falsely trigger a power-off command, causing inconvenience to the use of the wall-mounted washing machine.

[0005] In view of this, the present invention is hereby proposed. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a method for detecting abnormal installation of a wall-mounted drum washing machine. The washing machine compares the changes in optical signals acquired in real time with the optical signal change patterns determined by the detachment experiment, judges whether the changes in optical signals conform to the detachment characteristics based on the comparison results, and controls the power supply status of the washing machine accordingly.

[0007] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows:

[0008] The first objective of this invention is to provide a method for detecting abnormal installation of a wall-mounted drum washing machine. The washing machine determines whether it has detached from the wall based on changes in the reflected light signal received by a photoelectric sensor. The photoelectric sensor emits light along the axial and / or radial direction of the drum of the washing machine towards the reflector and receives the reflected light.

[0009] In the above-mentioned scheme, due to gravity, the wall-mounted washing machine always falls towards the ground when it detaches from the wall. Therefore, the reflected signal of the optical sensor that emits light radially in an approximately vertical direction along the drum will change significantly during this process, allowing the washing machine to detect the detachment. However, because the detachment process is strongly influenced by gravity and tends to fall vertically downwards, if the optical sensor emits light radially in an approximately horizontal direction along the drum, even if the top of the washing machine flips downwards and detaches, the distance between the radially horizontal light and the wall remains unchanged. Therefore, under this setting, the change in the reflected light signal may be insufficient to determine the detachment. In view of this, the present invention adjusts the light emission direction of the optical sensor to be along the drum axis. This allows for rapid detection of changes in the reflected light signal when the machine leaves the wall, and can also be combined with the signal of the vertically reflected light to determine the detachment.

[0010] According to the above-mentioned method for detecting installation abnormalities, the washing machine obtains the change coefficient of the reflected light signal of the photoelectric sensor per unit time and determines whether the washing machine has fallen off the wall it is installed on; or, the washing machine obtains the change coefficient of the reflected light signal of the photoelectric sensor per unit time and compares it with a set coefficient, and determines whether the washing machine has fallen off the wall it is installed on based on the similarity between the change coefficient and the set coefficient.

[0011] In the above solutions, under certain optical sensor settings, the intensity of the reflected light signal can be directly used to determine whether the washing machine has detached from the wall, even if foreign objects obstruct the reflected light. However, under other optical sensor settings, when an obstacle appears within the light emission range, the change in the reflected signal follows the same trend as the light reflection signal when the washing machine detaches. In this case, the change in signal intensity alone cannot determine whether the washing machine is actually detached; therefore, it is necessary to compare the signal change with the set conditions for judgment.

[0012] According to the above-mentioned method for detecting installation abnormalities, the similarity is obtained by fitting a variation coefficient and a set coefficient. When the error between the similarity and the set similarity is less than a certain range, the washing machine determines that a detachment has occurred and cuts off the power. Preferably, the certain range increases with the increase of the washing machine's load capacity.

[0013] According to the above-mentioned method for detecting installation abnormalities, the set coefficient is derived from several drop tests of drum washing machines with different load ranges. Before running, the washing machine detects the current load range and calls up the corresponding set coefficient for calculating the similarity.

[0014] In the above scheme, the set coefficient can be obtained based on the summary of empirical values. Generally, a washing machine drop experiment is used to simulate the real situation of the drop. During the drop process, the change value and rate of change of the light signal intensity can form an approximate data curve. This data curve can be used as the set coefficient and compared with the signal change actually detected by the optical sensor. In addition, since the drop trajectory is affected when the washing machine load is different, this invention simulates the drop scenario when the washing machine load is within different ranges, and obtains the set coefficient corresponding to different loads. The fitting includes subtracting or dividing the change coefficient and the set coefficient to obtain the similarity. Other fitting methods commonly used in the field can also be used. When the set similarity is calculated by division, it is generally based on 100%. When the set similarity is calculated by subtraction, it is based on the test value of the set coefficient in the simulated drop experiment.

[0015] According to the above-mentioned method for detecting installation abnormalities, when the reflective object is located above the washing machine, the photoelectric sensor emits and receives reflected light vertically upward along the radial direction of the drum. The washing machine only obtains the change coefficient of the reflected light signal of the photoelectric sensor per unit time. When the change coefficient becomes smaller, it is determined that the washing machine has fallen off the wall and the power is cut off. Preferably, the reflective object is the ceiling of the room.

[0016] In the above solution, when an obstacle appears above the washing machine, the reflected light signal intensity will increase because the obstacle is necessarily lower than the room ceiling. Since the washing machine tends to fall downwards due to gravity, the intensity of light reflected from vertically upward-emitted beams decreases regardless of the fall condition. Therefore, once the washing machine detects a decrease in the coefficient of change, it can immediately determine that a fall has occurred. The washing machine provided by this invention can also issue an alarm or prompt message when it detects a fall to remind the user to handle the incident. The module that issues the alarm or prompt message is powered by a built-in power supply, ensuring that this process is not affected by a mains power outage.

[0017] According to the above-mentioned method for detecting installation abnormalities, when the reflective object is located below the washing machine, the photoelectric sensor emits and receives reflected light vertically downward along the radial direction of the drum. The washing machine obtains the change coefficient of the reflected light signal of the photoelectric sensor per unit time, compares it with the set coefficient to obtain the similarity, and determines whether the washing machine has fallen off the wall from its installation. Preferably, the reflective object is the room floor.

[0018] In the above scheme, when an obstacle appears below the washing machine, the signal intensity of the reflected light will increase because the obstacle is necessarily higher than the room floor. Since the washing machine tends to fall downwards due to gravity, the reflected light signal intensity will also increase regardless of the fall condition. To avoid unexpected shutdowns caused by confusion between these two scenarios of increased reflected light signal intensity, this invention introduces a set coefficient obtained from simulated fall experiments. When an obstacle below the washing machine blocks the emitted light from the optical sensor, the signal intensity received by the optical sensor increases within a short unit time (the unit time in this invention can be selected from a short time interval measured in milliseconds), but its intensity value is significantly higher than the light signal feedback intensity immediately after the fall occurs in the fall experiment. At this point, it can be determined that the washing machine has not actually fallen, but rather that an obstacle has blocked the light, causing the signal change.

[0019] According to the above-mentioned method for detecting installation abnormalities, when the reflective object is the washing machine mounted on the wall, the photoelectric sensor emits and receives reflected light along the drum axis towards the mounting wall. The washing machine obtains the change coefficient of the reflected light signal of the photoelectric sensor per unit time, compares it with the set coefficient to obtain the similarity, and determines whether the washing machine has fallen off the mounting wall.

[0020] In the above scheme, the setting of emitting light along the roller axis and emitting light vertically downwards have similar characteristics when detachment occurs, and both need to be compared with the set coefficient to determine whether detachment has actually occurred.

[0021] According to the above-mentioned method for detecting installation abnormalities, the variation coefficient includes the average intensity of the reflected light signal per unit time, and the set coefficient is obtained by averaging the average intensity of the reflected light signal per unit time in multiple drum washing machine drop tests; preferably, the variation coefficient also includes the intensity change rate of the reflected light signal per unit time, and the set coefficient is obtained by averaging the intensity change rate of the reflected light signal per unit time in multiple drum washing machine drop tests.

[0022] In the above scheme, the variation coefficient and the set coefficient can be the average value of the reflected light signal intensity, or the rate of change of the reflected light signal intensity can be incorporated into the judgment system to supplement the shortcomings of the average intensity value. For example, when there is an obstacle blocking the emitted light from the optical sensor under the washing machine, the position of the obstacle is similar to the position when the washing machine just fell off, which will cause the average intensity values ​​of the two to be close per unit time. In this case, it is necessary to further judge the rate of change of the intensity of the two. Since the obstacle is placed for a long time or passes by the path of the emitted light for a short time, the rate of change of the intensity of its reflected light differs from the actual fall situation. By comparing the two, it is possible to more accurately determine whether the washing machine has actually fallen off.

[0023] According to the above-mentioned method for detecting installation abnormalities, when the reflective material is selected from the room floor and / or the wall where the washing machine is installed, both the variation coefficient and the set coefficient include the average intensity and intensity change rate of the reflected light signal per unit time.

[0024] According to the above-mentioned method for detecting installation abnormalities, when the average strength and the rate of change of strength are used as the judgment criteria, the similarity between the two and the set coefficient needs to be calculated separately, and the similarity conditions must be met simultaneously to determine that detachment has occurred; among them, the average strength has a higher weight in the judgment criteria.

[0025] The second objective of this invention is to provide a wall-mounted drum washing machine, wherein the washing machine is equipped with a photoelectric sensor that emits light along the radial and / or axial direction of the drum and receives reflected light. The photoelectric sensor is disposed on the outer periphery of the washing machine body along the circumference of the drum. The washing machine determines whether to cut off the power supply based on the change in the reflected light signal received by the photoelectric sensor.

[0026] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0027] 1. In the detection method provided by the present invention, the washing machine compares the changes in optical signals acquired in real time with the optical signal change patterns determined by the detachment experiment, judges whether the changes in optical signals conform to the detachment characteristics based on the comparison results, and controls the power supply status of the washing machine accordingly; thus avoiding the situation where the reflected light signal is affected by obstacles in the environment and falsely triggers a power outage.

[0028] 2. The detection method provided by the present invention can use the coefficient of variation of similarity and the set coefficient as a single average value of reflected light signal intensity, or it can incorporate the rate of change of reflected light signal intensity into the judgment system to supplement the shortcomings of the average value of intensity, making the detection method more accurate;

[0029] 3. The wall-mounted drum washing machine provided by the present invention is equipped with a photoelectric sensor that emits light along the radial and / or axial direction of the drum and receives reflected light, which can improve the washing machine's sensitivity to detecting the detachment state.

[0030] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0031] The accompanying drawings, as part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention, but do not constitute an undue limitation of the invention. Obviously, the drawings described below are merely some embodiments, and those skilled in the art can obtain other drawings based on these drawings without creative effort. In the drawings:

[0032] Figure 1This is a schematic diagram of the installation position of the photoelectric sensor of the wall-mounted drum washing machine in Embodiment 1 of the present invention;

[0033] Figure 2 This is a flowchart of the wall-mounted drum washing machine installation abnormality detection method in Embodiment 1 of the present invention;

[0034] Figure 3 This is a schematic diagram of the installation position of the photoelectric sensor in the wall-mounted drum washing machine in Embodiment 2 of the present invention;

[0035] Figure 4 This is a schematic diagram of the installation position of the photoelectric sensor of the wall-mounted drum washing machine in Embodiment 3 of the present invention;

[0036] Figure 5 This is a schematic diagram of the installation position of the photoelectric sensor of the wall-mounted drum washing machine in Embodiment 4 of the present invention;

[0037] Figure 6 This is a flowchart of the wall-mounted drum washing machine installation abnormality detection method in embodiments 2 to 4 of the present invention.

[0038] In the diagram: 1—Photoelectric sensor, 2—Wall-mounted drum washing machine, 3—Drum, 4—Room ceiling, 5—Mounted wall, 6—Room floor.

[0039] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the invention in any way, but rather to illustrate the concept of the invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0041] In the description of this invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0042] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0043] like Figures 1-6 As shown, this invention provides a method for detecting abnormal installation of a wall-mounted drum washing machine. The washing machine compares real-time acquired changes in optical signals with optical signal change patterns determined through a detachment experiment. Based on the comparison results, it determines whether the changes in the optical signals conform to detachment characteristics and controls the power supply status of the washing machine accordingly. The washing machine provided by this invention can also issue an alarm or prompt message when detachment is detected to remind the user to handle the incident. The module issuing the alarm or prompt message is powered by a built-in power supply, ensuring that this process is not affected by a main power outage.

[0044] Example 1

[0045] In this embodiment, a method for detecting abnormal installation of a wall-mounted drum washing machine is provided. The washing machine determines whether it has detached from the wall based on changes in the reflected light signal received by a photoelectric sensor. The photoelectric sensor emits light along the axial and / or radial direction of the drum of the washing machine toward the reflector and receives the reflected light.

[0046] In this embodiment, due to gravity, the wall-mounted washing machine always falls towards the ground when it detaches from the wall. Therefore, the reflected signal from the optical sensor emitting light radially in an approximately vertical direction along the drum changes significantly during this process, allowing the washing machine to detect the detachment. However, because the detachment process is strongly influenced by gravity and tends to fall vertically downwards, if the optical sensor emits light radially in an approximately horizontal direction along the drum, even if the washing machine flips downwards, the distance between the radially horizontal light and the wall remains unchanged. Therefore, under this setting, the change in the reflected light signal may be insufficient to determine the detachment. In view of this, the present invention adjusts the light emission direction of the optical sensor to be along the drum axis. This allows for rapid detection of changes in the reflected light signal when the machine leaves the wall, and can also be combined with the signal of vertically reflected light to determine the detachment status.

[0047] In this embodiment, the washing machine obtains the change coefficient of the reflected light signal of the photoelectric sensor per unit time and determines whether the washing machine has fallen off the wall it is installed on.

[0048] In this embodiment, under certain specific optical sensor settings, the washing machine can be directly determined from the changes in the intensity of the reflected light signal to determine whether it has fallen off the wall. Even if there are foreign objects blocking the reflected light, it will not affect the determination process.

[0049] In this embodiment, the similarity is obtained by fitting the variation coefficient and the set coefficient. When the error between the similarity and the set similarity is less than a certain range, the washing machine determines that a detachment has occurred and cuts off the power. Preferably, the certain range increases with the increase of the washing machine's load capacity.

[0050] In this embodiment, the set coefficient is derived from several drop tests of the drum washing machine with different load ranges. Before running, the washing machine detects the current load range and calls the corresponding set coefficient to calculate the similarity.

[0051] In this embodiment, the set coefficient can be obtained based on empirical values. Generally, a washing machine drop experiment is used to simulate the actual drop situation. During the drop, the change value and rate of change of the light signal intensity can form a rough data curve. This data curve can be used as the set coefficient and compared with the signal change actually detected by the optical sensor. Furthermore, since the drop trajectory is affected by different washing machine loads, this invention simulates drop scenarios when the washing machine load is within different ranges, obtaining set coefficients corresponding to different loads. The fitting includes subtracting or dividing the change coefficient and the set coefficient to obtain the similarity, or other commonly used fitting methods in the art can be used. When calculating the set similarity using division, 100% is generally used as the benchmark; when calculating using subtraction, the test value of the set coefficient in the simulated drop experiment is used as the benchmark.

[0052] In this embodiment, the reflector is located above the washing machine. The photoelectric sensor emits and receives reflected light vertically upward along the radial direction of the drum. The washing machine only obtains the change coefficient of the reflected light signal of the photoelectric sensor per unit time. When the change coefficient becomes smaller, it determines that the washing machine has fallen off the wall and cuts off the power. Preferably, the reflector is the ceiling of the room 4.

[0053] In this embodiment, when an obstacle appears above the washing machine, the signal intensity of the reflected light will increase because the obstacle is necessarily lower than the room ceiling 4. Since the washing machine tends to fall downwards due to gravity, the intensity of the reflected light signal will decrease regardless of the falling condition. Therefore, once the washing machine detects a decrease in the coefficient of change, it can immediately determine that a falling situation has occurred.

[0054] In this embodiment, the variation coefficient includes the average intensity of the reflected light signal per unit time, and the set coefficient is obtained by averaging the average intensity of the reflected light signal per unit time in multiple drum washing machine drop tests.

[0055] According to the above-mentioned method for detecting installation abnormalities, when the reflective material is selected from the room floor and / or the wall where the washing machine is installed, both the variation coefficient and the set coefficient include the average intensity and intensity change rate of the reflected light signal per unit time.

[0056] According to the above-mentioned method for detecting installation abnormalities, when the average strength and the rate of change of strength are used as the judgment criteria, the similarity between the two and the set coefficient needs to be calculated separately, and the similarity conditions must be met simultaneously to determine that detachment has occurred; among them, the average strength has a higher weight in the judgment criteria.

[0057] Example 2

[0058] This embodiment is a further improvement based on Embodiment 1. The difference between this embodiment and Embodiment 1 is as follows:

[0059] In this embodiment, the washing machine obtains the change coefficient of the reflected light signal of the photoelectric sensor per unit time and compares it with the set coefficient. Based on the similarity between the change coefficient and the set coefficient, it is determined whether the washing machine has fallen off the wall from its installation.

[0060] In this embodiment, under the setting mode of a specific optical sensor, when an obstacle appears within the light emission range, the change pattern of its reflection signal is similar to the pattern of the light reflection signal when the washing machine is detached. At this time, it is not possible to determine whether the washing machine is in a real detachment state based solely on the change in signal strength. Therefore, it is necessary to compare its signal change with the setting conditions to make a judgment.

[0061] In this embodiment, the reflector is located below the washing machine. The photoelectric sensor emits and receives reflected light vertically downward along the radial direction of the drum. The washing machine obtains the change coefficient of the reflected light signal of the photoelectric sensor per unit time, compares it with the set coefficient to obtain the similarity, and determines whether the washing machine has fallen off the wall from its installation. Preferably, the reflector is the room floor.

[0062] In this embodiment, when an obstacle appears below the washing machine, the signal intensity of the reflected light will increase because the obstacle is necessarily higher than the room floor. Since the washing machine tends to fall downwards due to gravity, the reflected light signal intensity will also increase regardless of the fall condition. To avoid unexpected shutdowns caused by confusion between these two scenarios of increased reflected light signal intensity, this embodiment introduces a set coefficient obtained from a simulated fall experiment. When an obstacle below the washing machine blocks the emitted light from the optical sensor, the signal intensity received by the optical sensor increases within a short unit time (in this embodiment, the unit time can be selected from a short time interval measured in milliseconds). However, its intensity value is significantly higher than the light signal feedback intensity immediately after the fall occurs in the fall experiment. At this point, it can be determined that the washing machine has not actually fallen, but rather that an obstacle has blocked the light, causing the signal change.

[0063] In this embodiment, the variation coefficient includes the average intensity of the reflected light signal per unit time and the intensity change rate. The set coefficient is obtained by averaging the average intensity of the reflected light signal per unit time and the intensity change rate in multiple drum washing machine drop tests.

[0064] In this embodiment, the variation coefficient and the set coefficient can be the average value of the reflected light signal intensity, or the rate of change of the reflected light signal intensity can be incorporated into the judgment system to supplement the inadequacy of the average intensity value. For example, when there is an obstacle blocking the emitted light from the optical sensor under the washing machine, the position of the obstacle is similar to the position when the washing machine just fell off, which will cause the average intensity values ​​of the two to be close per unit time. In this case, it is necessary to further judge the rate of change of the intensity of the two. Since the obstacle is placed for a long time or passes by the path of the emitted light for a short time, the rate of change of the intensity of its reflected light differs from the actual fall situation. By comparing the two, it is possible to more accurately determine whether the washing machine has actually fallen off.

[0065] In this embodiment, when the reflective material is selected from the room floor 6, both the variation coefficient and the set coefficient include the average intensity and intensity change rate of the reflected light signal per unit time.

[0066] In this embodiment, when the average strength and the rate of change of strength are used as the judgment criteria, the similarity between the two and the set coefficient needs to be calculated separately, and the similarity conditions must be met simultaneously to determine that detachment has occurred; among them, the average strength has a higher weight in the judgment criteria.

[0067] Other implementation methods in this embodiment are the same as in Embodiment 1.

[0068] Example 3

[0069] This embodiment is a further improvement based on Embodiment 1. The difference between this embodiment and Embodiment 1 is as follows:

[0070] In this embodiment, the washing machine obtains the change coefficient of the reflected light signal of the photoelectric sensor per unit time and compares it with the set coefficient. Based on the similarity between the change coefficient and the set coefficient, it is determined whether the washing machine has fallen off the wall from its installation.

[0071] In this embodiment, under the setting mode of a specific optical sensor, when an obstacle appears within the light emission range, the change pattern of its reflection signal is similar to the pattern of the light reflection signal when the washing machine is detached. At this time, it is not possible to determine whether the washing machine is in a real detachment state based solely on the change in signal strength. Therefore, it is necessary to compare its signal change with the setting conditions to make a judgment.

[0072] In this embodiment, when the reflector is the wall 5 on which the washing machine is installed, the photoelectric sensor emits and receives reflected light along the drum axis toward the wall 5. The washing machine obtains the change coefficient of the reflected light signal of the photoelectric sensor per unit time, compares it with the set coefficient to obtain the similarity, and determines whether the washing machine has fallen off the wall.

[0073] In this embodiment, the method of emitting light along the roller axis and the method of emitting light vertically downward in embodiment 2 have similar characteristics when detachment occurs. Both require comparison with a set coefficient to determine whether detachment has actually occurred.

[0074] In this embodiment, the variation coefficient includes the average intensity of the reflected light signal per unit time and the intensity change rate. The set coefficient is obtained by averaging the average intensity of the reflected light signal per unit time and the intensity change rate in multiple drum washing machine drop tests.

[0075] In this embodiment, the variation coefficient and the set coefficient can be the average value of the reflected light signal intensity, or the rate of change of the reflected light signal intensity can be incorporated into the judgment system to supplement the inadequacy of the average intensity value. For example, when there is an obstacle blocking the emitted light from the optical sensor under the washing machine, the position of the obstacle is similar to the position when the washing machine just fell off, which will cause the average intensity values ​​of the two to be close per unit time. In this case, it is necessary to further judge the rate of change of the intensity of the two. Since the obstacle is placed for a long time or passes by the path of the emitted light for a short time, the rate of change of the intensity of its reflected light differs from the actual fall situation. By comparing the two, it is possible to more accurately determine whether the washing machine has actually fallen off.

[0076] In this embodiment, when the reflector is selected from the wall 5 where the washing machine is installed, both the variation coefficient and the set coefficient include the average intensity and the rate of change of the reflected light signal per unit time.

[0077] In this embodiment, when the average strength and the rate of change of strength are used as the judgment criteria, the similarity between the two and the set coefficient needs to be calculated separately, and the similarity conditions must be met simultaneously to determine that detachment has occurred; among them, the average strength has a higher weight in the judgment criteria.

[0078] Other implementation methods in this embodiment are the same as in Embodiment 1.

[0079] Example 4

[0080] This embodiment is a further improvement based on Embodiment 3. The difference between this embodiment and Embodiment 3 is as follows:

[0081] In this embodiment, the reflector includes the room floor 6 in addition to the wall 5, that is, the optical sensor is set to emit light vertically downward along the radial direction of the roller and upward along the axial direction of the roller toward the room floor 6.

[0082] Other implementation methods in this embodiment are the same as in Embodiment 3.

[0083] Example 5

[0084] In this embodiment, a wall-mounted drum washing machine 2 is provided. The washing machine is equipped with a photoelectric sensor 1 that emits light radially and / or axially along the drum 3 and receives reflected light. The photoelectric sensor 1 is arranged around the outer periphery of the washing machine body along the drum 3. The washing machine determines whether to cut off the power supply based on the change in the reflected light signal received by the photoelectric sensor.

[0085] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A method for detecting abnormal installation of a wall-mounted drum washing machine, characterized in that, The washing machine determines whether it has detached from the wall it is installing on based on changes in the reflected light signal received by the photoelectric sensor. The photoelectric sensor emits light towards the reflector along the axial and / or radial direction of the washing machine drum and receives the reflected light. The washing machine acquires the change coefficient of the reflected light signal from the photoelectric sensor per unit time and determines whether the washing machine has fallen off the wall from its installation location. Alternatively, the washing machine can acquire the change coefficient of the reflected light signal from the photoelectric sensor per unit time and compare it with a set coefficient. Based on the similarity between the change coefficient and the set coefficient, it can determine whether the washing machine has detached from the wall it is installed on.

2. The method for detecting abnormal installation of a wall-mounted drum washing machine according to claim 1, characterized in that, The similarity is obtained by fitting the variation coefficient and the set coefficient. When the error between the similarity and the set similarity is less than a certain range, the washing machine determines that the detachment has occurred and cuts off the power.

3. The method for detecting abnormal installation of a wall-mounted drum washing machine according to claim 2, characterized in that, The specified range expands as the washing machine's load capacity increases.

4. The method for detecting abnormal installation of a wall-mounted drum washing machine according to claim 3, characterized in that, The set coefficients are derived from several drop tests of drum washing machines with different load ranges. Before running, the washing machine detects the current load range and calls up the corresponding set coefficients to calculate the similarity.

5. The method for detecting abnormal installation of a wall-mounted drum washing machine according to any one of claims 1 to 4, characterized in that, When the reflective object is above the washing machine, the photoelectric sensor emits and receives the reflected light vertically upward along the radial direction of the drum. The washing machine only obtains the change coefficient of the reflected light signal of the photoelectric sensor per unit time. When the change coefficient becomes smaller, it determines that the washing machine has fallen off the wall and cuts off the power.

6. The method for detecting abnormal installation of a wall-mounted drum washing machine according to claim 5, characterized in that, The reflective object is the room ceiling.

7. The method for detecting abnormal installation of a wall-mounted drum washing machine according to any one of claims 1 to 4, characterized in that, When the reflective object is located below the washing machine, the photoelectric sensor emits and receives reflected light vertically downward along the radial direction of the drum. The washing machine obtains the change coefficient of the reflected light signal of the photoelectric sensor per unit time, compares it with the set coefficient to obtain the similarity, and determines whether the washing machine has fallen off the wall from its installation.

8. The method for detecting abnormal installation of a wall-mounted drum washing machine according to claim 7, characterized in that, The reflective object is the room floor.

9. The method for detecting abnormal installation of a wall-mounted drum washing machine according to any one of claims 1 to 4, characterized in that, When the reflector is the washing machine mounted on the wall, the photoelectric sensor emits and receives reflected light along the drum axis towards the mounting wall. The washing machine obtains the change coefficient of the reflected light signal of the photoelectric sensor per unit time, compares it with the set coefficient to obtain the similarity, and determines whether the washing machine has fallen off the mounting wall.

10. The method for detecting abnormal installation of a wall-mounted drum washing machine according to any one of claims 1 to 4, characterized in that, The variation coefficient includes the average intensity of the reflected light signal per unit time, and the set coefficient is obtained by averaging the average intensity of the reflected light signal per unit time in multiple drum washing machine drop tests.

11. The method for detecting abnormal installation of a wall-mounted drum washing machine according to claim 10, characterized in that, The variation coefficient also includes the rate of change of the intensity of the reflected light signal per unit time. The set coefficient is obtained by averaging the rate of change of the intensity of the reflected light signal per unit time in multiple drum washing machine drop tests.

12. The method for detecting abnormal installation of a wall-mounted drum washing machine according to claim 10, characterized in that, When the reflector is selected from the room floor and / or the wall where the washing machine is installed, both the variation coefficient and the setting coefficient include the average intensity and the rate of change of the reflected light signal per unit time.

13. A wall-mounted drum washing machine, characterized in that, The method for detecting abnormal installation of a wall-mounted drum washing machine according to any one of claims 1 to 12 is described above; the washing machine is equipped with a photoelectric sensor that emits light along the radial and / or axial direction of the drum and receives reflected light, the photoelectric sensor being disposed on the outer periphery of the washing machine body along the circumference of the drum, and the washing machine determining whether to cut off the power supply based on the change in the reflected light signal received by the photoelectric sensor.

Images