Filter screen life detection circuit, filter screen life detection device and floor cleaning robot

Abstract

The application belongs to the technical field of sweeping robots, and provides a filter screen life detection circuit, a filter screen life detection device and a sweeping robot, wherein the micro dust detection circuit is arranged in the air duct, the micro dust concentration in the air duct is detected through the micro dust detection circuit, a micro dust detection signal is generated, and a filter screen replacement signal is generated by the main control circuit in the case that the voltage of the micro dust detection signal is greater than a first preset threshold, so that the user knows that the filter screen of the sweeping robot reaches the service life, the filter screen life is judged by judging the micro dust concentration in the air duct, the replacement of the filter screen is reduced, the cost is saved, and the user who forgets to replace the filter screen can be timely notified to replace a new filter screen.

Description

Technical Field

[0001] This application belongs to the field of sweeping robot technology, and particularly relates to a filter life detection circuit, a filter life detection device, and a sweeping robot. Background Technology

[0002] Robotic vacuum cleaners are increasingly becoming a part of home life, and their level of intelligence is also increasing. However, the lifespan of the dustbin filter in robotic vacuum cleaners is usually based on the reference value provided by the manufacturer, and the lifespan will vary depending on the user's application scenario.

[0003] Currently, in order to improve the user experience, manufacturers of robotic vacuum cleaners often provide a relatively low reference value. Therefore, users need to frequently purchase new filters, significantly increasing operating costs. At the same time, some users are unaware that filters need to be replaced and continue using the dustbin, which greatly reduces the filter's effectiveness, causing dust to be blown into the air and polluting the environment. Summary of the Invention

[0004] To address the aforementioned technical problems, this application provides a filter life detection circuit, a filter life detection device, and a sweeping robot, aiming to solve the problem that the current filter life is set to a fixed reference value, which prevents the filter from being flexibly replaced according to the specific application conditions of the sweeping robot.

[0005] The first aspect of this application provides a filter life detection circuit, which is used to detect the life of a filter. The filter is disposed at one end of an air duct. The filter life detection circuit includes:

[0006] A dust detection circuit is installed inside the air duct to detect the dust concentration inside the air duct and generate a dust detection signal.

[0007] The main control circuit is connected to the dust detection circuit and is used to receive the dust detection signal and generate a filter replacement signal when the voltage of the dust detection signal is greater than a first preset threshold.

[0008] In some embodiments, the main control circuit is further configured to determine the lifetime detection signal based on the micro-dust detection signal and a preset lifetime relationship table;

[0009] The filter life detection circuit also includes:

[0010] The display circuit, connected to the main control circuit, is used to display the lifespan of the filter based on the lifespan detection signal.

[0011] In some embodiments, the main control circuit is further configured to generate an early warning control signal when the voltage of the dust detection signal is greater than a second preset threshold.

[0012] The filter life detection circuit also includes:

[0013] An early warning circuit, connected to the main control circuit, is used to issue an early warning signal based on the early warning control signal.

[0014] In some embodiments, the air duct has a "Y" shaped structure;

[0015] The dust detection circuit includes a first dust sensor and a second dust sensor, which are respectively located in two branches of the air duct. The first dust sensor generates a first dust detection signal, and the second dust sensor generates a second dust detection signal. The main control circuit generates the filter replacement signal based on the first dust detection signal and the second dust detection signal.

[0016] In some embodiments, the main control circuit generates the filter replacement signal when the voltage of the first dust detection signal or the second dust detection signal is greater than a first preset threshold.

[0017] In some embodiments, a fan is provided at the other end of the air duct, and the fan is connected to the main control circuit; the main control circuit is also used to control the dust detection circuit to start when the fan starts, and to detect the dust concentration in the air duct.

[0018] In some embodiments, the main control circuit is further configured to continuously receive the dust detection signal during a first preset time period after the fan starts, obtain a dust concentration curve based on the dust detection signal, and generate a filter replacement signal based on the dust detection signal.

[0019] In some embodiments, the main control circuit is further configured to determine the cumulative time value of the dust concentration being greater than the preset dust concentration threshold based on the dust concentration curve, and generate the filter replacement signal when the ratio of the cumulative time value to the first preset time period is greater than the preset ratio.

[0020] A second aspect of this application provides a filter life detection device, which includes a filter life detection circuit as described in any of the preceding claims.

[0021] A third aspect of this application provides a sweeping robot, including: a filter, an air duct, a fan, and a filter life detection circuit as described in any of the above embodiments, wherein the filter and the fan are respectively disposed at both ends of the air duct, and the micro-dust detection circuit is disposed inside the air duct.

[0022] The beneficial effects of this application embodiment are as follows: The dust detection circuit is located inside the air duct. The dust detection circuit detects the dust concentration in the air duct and generates a dust detection signal. When the voltage of the dust detection signal is greater than a first preset threshold, the main control circuit generates a filter replacement signal, so that the user knows that the filter of the sweeper has reached the end of its service life. By judging the dust concentration in the air duct, the life of the filter can be judged, reducing the need for filter replacement and saving costs. At the same time, it can promptly notify users who have forgotten to replace the filter to replace it with a new one. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the filter life detection circuit provided in an embodiment of this application. Figure 1 ;

[0024] Figure 2 This is a schematic diagram of the filter life detection circuit provided in an embodiment of this application. Figure 2 ;

[0025] Figure 3 This is a schematic diagram of the filter life detection circuit provided in an embodiment of this application. Figure 3 ;

[0026] Figure 4 This is a schematic diagram of the filter life detection circuit provided in an embodiment of this application. Figure 4 ;

[0027] Figure 5 This is a schematic diagram of the filter life detection circuit provided in an embodiment of this application. Figure 5 . Detailed Implementation

[0028] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0029] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0030] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "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 application 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 limitations on this application.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means one or more, unless otherwise explicitly specified.

[0032] Currently, in order to improve the user experience, manufacturers of robotic vacuum cleaners often provide a relatively low reference value. Therefore, users need to frequently purchase new filters, significantly increasing operating costs. At the same time, some users are unaware that filters need to be replaced and continue using the dustbin, which greatly reduces the filter's effectiveness, causing dust to be blown into the air and polluting the environment.

[0033] To address the aforementioned technical problems, this application provides a filter life detection circuit. This circuit is used to detect the lifespan of a filter. (See attached image.) Figure 1 As shown, the filter life detection circuit includes a dust detection circuit 210 and a main control circuit 220. The dust detection circuit 210 is used to detect the dust concentration in the air duct 130 and generate a dust detection signal. The main control circuit 220 is connected to the dust detection circuit 210 and is used to receive the dust detection signal and generate a filter replacement signal when the voltage of the dust detection signal is greater than a first preset threshold.

[0034] In this embodiment, see Figure 2As shown, the dust detection circuit 210 is located inside the air duct 130, the filter 110 is located at one end of the air duct 130, and the fan 120 is located at the other end of the air duct 130. During the sweeping process, the fan 120 sucks the garbage into the dust box, and the filter 110 intercepts the garbage in the dust box. The filter 110 of the sweeping robot is used to filter out the dust sucked into the sweeping robot, which is then carried into the air again, causing secondary air pollution. After the filter 110 is washed multiple times, the filtration effect will inevitably decrease. In this embodiment, the dust detection circuit 210 pre-installed in the air duct 130 measures the dust concentration in the air duct 130 and obtains the corresponding dust detection signal. The main control circuit 220 reads the voltage of the dust detection signal through the signal line. When the voltage of the dust detection signal is greater than a first preset threshold, it is determined that the filter 110 has reached its life value, thereby generating a filter replacement signal to promptly notify the user to replace the filter.

[0035] In some embodiments, filter 110 may be a HEPA filter.

[0036] In some embodiments, the main control circuit 220 may include a comparison circuit, which is used to compare the voltage value of the dust detection signal with the first preset threshold, and output a high-level filter replacement signal when the voltage of the dust detection signal is greater than the first preset threshold.

[0037] In some embodiments, the dust detection circuit 210 can be composed of a dust sensor. Particles and molecules scatter light when irradiated, and simultaneously absorb some of the energy of the irradiated light. In the dust sensor, when a beam of parallel monochromatic light is incident on the particle field being measured, it will be affected by scattering and absorption around the particles, resulting in attenuation of the light intensity. Thus, the relative attenuation rate of the incident light passing through the measured concentration field can be calculated, and the magnitude of the relative attenuation rate essentially linearly reflects the relative concentration of dust in the measured field. The magnitude of the light intensity is directly proportional to the strength of the electrical signal converted from photoelectric signal; the relative attenuation rate can be obtained by measuring the electrical signal.

[0038] In some embodiments, the main control circuit 220 is further configured to determine the lifetime detection signal based on the dust detection signal and a preset lifetime relationship table. See also Figure 3 As shown, the filter life detection circuit also includes a display circuit 230, which is connected to the main control circuit 220. The display circuit 230 is used to display the life of the filter 110 according to the life detection signal.

[0039] In this embodiment, a preset lifespan relationship table can be established between the dust detection signal and the filter lifespan. That is, the voltage value of each dust detection signal corresponds to the lifespan value of a filter. The main control circuit 220 obtains the voltage value of the dust detection signal and looks up the corresponding filter lifespan value from the preset lifespan relationship table based on the voltage value. The display circuit 230 displays the filter lifespan value, which can provide users with a visual filter lifespan reminder signal, so that users can know the usage status of the filter 110 at any time.

[0040] In some embodiments, the main control circuit 220 is further configured to generate a warning control signal when the voltage of the dust detection signal is greater than a second preset threshold. See also Figure 4 As shown, the filter life detection circuit also includes an early warning circuit 240, which is connected to the main control circuit 220. The early warning circuit 240 is used to issue an early warning signal based on the early warning control signal.

[0041] In this embodiment, the dust detection circuit 210 is pre-installed in the air duct 130 to measure the dust concentration in the air duct 130 and obtain the corresponding dust detection signal. The main control circuit 220 reads the voltage of the dust detection signal through the signal line. When the voltage of the dust detection signal is greater than the second preset threshold, it is determined that the lifespan of the filter 110 is close to its lifespan value, thereby generating an early warning signal to promptly notify the user to prepare to replace the filter. This provides the user with time to purchase a new filter and avoids the situation where the filter reaches its lifespan value but the user has not prepared a spare filter.

[0042] In some embodiments, see Figure 5 As shown, the air duct 130 has a "Y" shaped structure; the dust detection circuit 210 includes a first dust sensor 211 and a second dust sensor 212. The first dust sensor 211 and the second dust sensor 212 are respectively set in two branches of the air duct 130. The first dust sensor 211 generates a first dust detection signal, and the second dust sensor 212 generates a second dust detection signal. The main control circuit 220 generates a filter replacement signal based on the first dust detection signal and the second dust detection signal.

[0043] In this embodiment, during operation, the fan 120 generates varying wind speeds (strong, medium, or weak) to adapt to different working conditions. However, the dust sensor in the dust detection circuit 210 may fail to detect the dust concentration within the duct 130 in a timely manner under strong winds. For example, when the wind is strong, dust particles in the duct 130 may be quickly discharged through it before the dust sensor in the dust detection circuit 210 detects them, leading to dust being blown into the air and polluting the environment. In this embodiment, the duct 130 is configured as a "Y"-shaped structure with two branch channels. One channel houses the fan 120, while the other branch channel closes the outlet. Both branch channels are equipped with dust sensors. The first dust sensor 211 and the second dust sensor 212 are respectively installed in two branches of the air duct 130. The first dust sensor 211 generates a first dust detection signal, and the second dust sensor 212 generates a second dust detection signal. The main control circuit 220 generates a filter replacement signal based on the first dust detection signal and the second dust detection signal. That is, if the pressure of any one of the dust detection signals is greater than the first preset threshold, it is determined that the filter 110 has reached its life value, thereby generating a filter replacement signal and promptly notifying the user to replace the filter.

[0044] In some embodiments, the main control circuit 220 generates a filter replacement signal when the voltage of the first dust detection signal or the second dust detection signal is greater than a first preset threshold.

[0045] In this embodiment, the first dust sensor 211 and the second dust sensor 212 are pre-installed in two branch channels of the air duct 130, respectively. The first dust sensor 211 and the second dust sensor 212 measure the dust concentration in the two branches of the air duct 130 to obtain corresponding dust detection signals. The first dust sensor 211 is located at the center of the airflow, while the second dust sensor 212 is located in a stationary space, which helps to detect the dust concentration in different parts of the air duct 130. The main control circuit 220 reads the voltage of the dust detection signals output by the first dust sensor 211 and the second dust sensor 212 through the signal line. If the voltage of the first dust detection signal or the second dust detection signal is greater than a first preset threshold, it determines that the filter 110 has reached its lifespan, thereby generating a filter replacement signal to promptly notify the user to replace the filter.

[0046] In some embodiments, a fan 120 is provided at the other end of the air duct 130, and the fan 120 is connected to the main control circuit 220. The main control circuit 220 is also used to control the dust detection circuit 210 to start when the fan 120 starts, and to control the dust detection circuit 210 to detect the dust concentration in the air duct 130.

[0047] In this embodiment, when the fan 120 is not started, the main control circuit 220 controls the dust detection circuit 210 to be in a dormant state, which can save energy consumption of the dust detection circuit 210. When the fan 120 is started, the main control circuit 220 controls the dust detection circuit 210 to start and controls the dust detection circuit 210 to detect the dust concentration in the air duct 130.

[0048] In some embodiments, the main control circuit 220 is also used to continuously receive dust detection signals during a first preset time period after the fan 120 is started, obtain a dust concentration curve based on the dust detection signals, and generate a filter replacement signal based on the dust concentration curve.

[0049] In this embodiment, when the fan 120 starts, the main control circuit 220 controls the dust detection circuit 210 to start and controls the dust detection circuit 210 to detect the dust concentration in the air duct 130 in real time. During the first preset time period after the fan 120 starts, the dust detection circuit 210 continuously generates dust detection signals. The main control circuit 220 obtains a dust concentration curve based on the dust detection signals and generates a filter replacement signal based on the dust concentration curve.

[0050] In some embodiments, if the dust detection circuit 210 includes a first dust sensor 211 and a second dust sensor 212, and the first dust sensor 211 and the second dust sensor 212 are respectively disposed in two branches of the air duct 130, during a first preset time period after the fan 120 is started, the first dust sensor 211 continuously generates a first dust detection signal, and the second dust sensor 212 continuously generates a second dust detection signal. The main control circuit 220 obtains a first dust concentration curve based on the first dust detection signal, and the main control circuit 220 obtains a second dust concentration curve based on the second dust detection signal. The main control circuit 220 generates a filter replacement signal based on the first dust concentration curve and the second dust concentration curve.

[0051] In some embodiments, the main control circuit 220 is further configured to determine the cumulative time value of the dust concentration being greater than the preset dust concentration threshold based on the dust concentration curve, and generate a filter replacement signal when the ratio of the cumulative time value to the first preset time period is greater than the preset ratio.

[0052] In some embodiments, the preset ratio is at least 0.5, that is, when the cumulative value of the time when the dust concentration is greater than the preset dust concentration threshold and the ratio of the first preset time period are at least greater than 0.5, a filter replacement signal is generated to remind the user to replace the filter.

[0053] In this embodiment, the main control circuit 220 calculates the cumulative time value of the dust concentration curve where the dust concentration is greater than a preset dust concentration threshold, and generates a filter replacement signal when the ratio of the cumulative time value to a first preset time period is greater than a preset ratio. For example, if the preset ratio is 60%, generating a filter replacement signal when the ratio of the cumulative time value of the dust concentration greater than the preset dust concentration threshold to the first preset time period is greater than 60% indicates that the cumulative time value of the dust concentration greater than the preset dust concentration threshold within the first preset time period has exceeded 60% of the entire test time period, indicating that the filter has failed and reached its lifespan. This avoids errors caused by high dust concentration in the air duct 130 within a short period of time.

[0054] In some embodiments, if the dust detection circuit 210 includes a first dust sensor 211 and a second dust sensor 212, and the first dust sensor 211 and the second dust sensor 212 are respectively disposed in two branches of the air duct 130, during a first preset time period after the fan 120 is started, the first dust sensor 211 continuously generates a first dust detection signal, and the second dust sensor 212 continuously generates a second dust detection signal. The main control circuit 220 obtains a first dust concentration curve based on the first dust detection signal, and the main control circuit 220 obtains a second dust concentration curve based on the second dust detection signal. The main control circuit 220 calculates the cumulative time value for which the dust concentration in the first dust concentration curve is greater than a preset dust concentration threshold, and generates a filter replacement signal when the ratio of the cumulative time value to the first preset time period is greater than a preset ratio; or the main control circuit 220 calculates the cumulative time value for which the dust concentration in the second dust concentration curve is greater than a preset dust concentration threshold, and generates a filter replacement signal when the ratio of the cumulative time value to the first preset time period is greater than a preset ratio.

[0055] To address the aforementioned technical problems, this application also provides a filter life detection device, which includes a filter life detection circuit as described in any of the preceding claims.

[0056] To address the aforementioned technical problems, this application also provides a sweeping robot, comprising: a filter, an air duct, a fan, and a filter life detection circuit as described in any of the above embodiments, wherein the filter and the fan are respectively disposed at both ends of the air duct, and the micro-dust detection circuit is disposed within the air duct.

[0057] The beneficial effects of this application embodiment are as follows: The dust detection circuit is located inside the air duct. The dust detection circuit detects the dust concentration in the air duct and generates a dust detection signal. When the voltage of the dust detection signal is greater than a first preset threshold, the main control circuit generates a filter replacement signal, so that the user knows that the filter of the sweeper has reached the end of its service life. By judging the dust concentration in the air duct, the life of the filter can be judged, reducing the need for filter replacement and saving costs. At the same time, it can promptly notify users who have forgotten to replace the filter to replace it with a new one.

[0058] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0059] Furthermore, the specific names of each functional unit and module are merely for ease of differentiation and are not intended to limit the scope of protection of this application. The specific working processes of the units and modules in the above system can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0060] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0061] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0062] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A filter life detection circuit, characterized in that, The filter life detection circuit is used to detect the life of the filter. The filter is disposed at one end of the air duct. The filter life detection circuit includes: A dust detection circuit is installed inside the air duct to detect the dust concentration inside the air duct and generate a dust detection signal. The main control circuit is connected to the dust detection circuit and is used to receive the dust detection signal and generate a filter replacement signal when the voltage of the dust detection signal is greater than a first preset threshold. The air duct has a "Y" shaped structure. The dust detection circuit includes a first dust sensor and a second dust sensor. The first dust sensor and the second dust sensor are respectively set in two branches of the air duct. The first dust sensor generates a first dust detection signal, and the second dust sensor generates a second dust detection signal. When the voltage of the first dust detection signal or the second dust detection signal is greater than a first preset threshold, the main control circuit determines that the filter has reached its life value, and then generates a filter replacement signal. The "Y"-shaped structure has two branch channels, one of which is used to install the fan, and the other branch channel closes the outlet.

2. The filter life detection circuit as described in claim 1, characterized in that, The main control circuit is also used to determine the lifetime detection signal based on the micro-dust detection signal and the preset lifetime relationship table; The filter life detection circuit also includes: The display circuit, connected to the main control circuit, is used to display the lifespan of the filter based on the lifespan detection signal.

3. The filter life detection circuit as described in claim 1, characterized in that, The main control circuit is also used to generate an early warning control signal when the voltage of the dust detection signal is greater than a second preset threshold. The filter life detection circuit also includes: An early warning circuit, connected to the main control circuit, is used to issue an early warning signal based on the early warning control signal.

4. The filter life detection circuit as described in claim 1, characterized in that, A fan is provided at the other end of the air duct, and the fan is connected to the main control circuit. The main control circuit is also used to control the dust detection circuit to start when the fan starts, and to detect the dust concentration in the air duct.

5. The filter life detection circuit as described in claim 4, characterized in that, The main control circuit is also used to continuously receive the dust detection signal during the first preset time period after the fan starts, obtain the dust concentration curve based on the dust detection signal, and generate a filter replacement signal based on the dust detection signal.

6. The filter life detection circuit as described in claim 5, characterized in that, The main control circuit is also used to determine the cumulative time value of the dust concentration being greater than the preset dust concentration threshold based on the dust concentration curve, and to generate the filter replacement signal when the ratio of the cumulative time value to the first preset time period is greater than the preset ratio.

7. A filter life detection device, characterized in that, The filter life detection device includes the filter life detection circuit as described in any one of claims 1-6.

8. A robotic vacuum cleaner, characterized in that, include: The filter screen, the air duct, the fan, and the filter screen life detection circuit as described in any one of claims 1-6, wherein the filter screen and the fan are respectively disposed at both ends of the air duct, and the micro-dust detection circuit is disposed inside the air duct.

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