Dust collector site identification system and control method thereof

Abstract

The invention discloses a dust collector site identification system, which comprises a laser probe used for emitting light towards a working ground; the photoresistor module comprises a photoresistor and a fixed resistor which are connected in series, and the photoresistor is used for receiving light emitted by the laser probe and reflected by the working ground so as to detect the light reflection characteristic of the working ground; the piezoelectric sensor is arranged at the bottom of a ground brush of the dust collector, and the piezoelectric sensor is used for detecting the contact pressure with the working ground; and the single chip microcomputer is used for generating a working ground identification result according to the voltage value shared by the photoresistor and the pulse signal fed back by the piezoelectric sensor, and adjusting the suction force of a main motor of the dust collector and the rotating speed of a ground brush motor according to the identification result. The invention further discloses a control method of the dust collector site recognition system. Compared with the prior art, the problems that an existing ground material recognition scheme of a dust collector is limited in recognition capacity, and the adjustment of the dust collection capacity according to different work sites is limited are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of vacuum cleaners, and in particular to a vacuum cleaner site recognition system and a control method thereof. Background Art

[0002] The main issues that need to be considered during the operation of the vacuum cleaner include energy consumption, vacuuming effect, wear and tear, etc. The variety of vacuum cleaner working sites makes it difficult for vacuum cleaners to meet the needs of different working environments by adopting a single working mode.

[0003] On tiled floors, if the vacuum cleaner's main motor has low suction power and the floor brush motor has low speed, the vacuuming effect will be affected. If the vacuum cleaner's main motor has high suction power and the floor brush motor has high speed, the energy consumption will be high. At the same time, the high speed of the floor brush motor may also blow dirt away.

[0004] When working on carpets, since dirt is hidden deep, it is necessary to increase the suction power of the main motor to clean the dust. When working on sisal carpets, since sisal carpets are woven, the hemp rope is thicker and harder. If the speed of the vacuum cleaner floor brush motor is high, the friction between the vacuum cleaner floor brush and the sisal carpet will increase, which will cause double wear of the floor brush and the sisal carpet. Therefore, the speed of the floor brush motor should be appropriately reduced while increasing the suction power of the main motor.

[0005] Existing vacuum cleaners use ultrasonic and other identification solutions to distinguish the ground into two states: floor (tile) and carpet, but cannot further distinguish the type of carpet.

[0006] Therefore, the working modes of current vacuum cleaners are usually set to two modes: floor (tile) mode and carpet mode. The recognition and adjustment capabilities for different work sites are limited, and the suction power of the main motor and the speed of the floor brush motor cannot be adjusted accordingly according to different work sites. Summary of the invention

[0007] The purpose of the present invention is to provide a vacuum cleaner site recognition system and a control method thereof, so as to solve the problem that the existing ground material recognition scheme of the vacuum cleaner has limited recognition ability and limited dust collection ability adjusted according to different working sites.

[0008] In order to achieve the above object, on the one hand, the present invention provides a vacuum cleaner site identification system, comprising:

[0009] A laser probe for emitting light toward a working surface;

[0010] A photoresistor module, which includes a photoresistor and a fixed resistor connected in series, and the photoresistor is used to receive the light emitted by the laser probe and reflected by the working ground, so as to detect the reflection characteristics of the working ground to the light;

[0011] A piezoelectric sensor is disposed at the bottom of the floor brush of the vacuum cleaner, and is used to detect the contact pressure with the working floor;

[0012] The single chip microcomputer is used to generate a working ground recognition result according to the voltage value shared by the photoresistor and the pulse signal fed back by the piezoelectric sensor, and adjust the suction force of the main motor of the vacuum cleaner and the speed of the floor brush motor according to the recognition result.

[0013] On the other hand, the present invention further discloses a control method of the vacuum cleaner site identification system as described above, comprising the following steps:

[0014] S1. Preliminary identification: The laser probe emits light toward the working ground, the photoresistor receives the light reflected by the working ground, and the single-chip microcomputer detects whether the voltage shared on the photoresistor is lower than the set threshold, and obtains the preliminary identification result of the working ground;

[0015] S2, secondary identification: The single chip microcomputer obtains the secondary identification result of the working ground according to the pulse signal fed back by the piezoelectric sensor;

[0016] S3, control adjustment: based on the preliminary recognition results and the secondary recognition results, the single chip microcomputer controls the suction power of the main motor of the vacuum cleaner and the speed of the floor brush motor according to a predetermined strategy.

[0017] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0018] 1. In the present invention, a group of laser probes, photoresistor components and piezoelectric sensors are used in combination to realize the recognition of various vacuum cleaner work sites such as tile floors, sisal carpets and non-sisal carpets, and the suction force of the main motor and the speed of the floor brush motor are adjusted accordingly, breaking through the limitation that the existing recognition method cannot further subdivide the carpet types. Based on the recognition results, a corresponding control strategy is adopted, which can effectively avoid excessive friction causing excessive wear between the sisal carpet and the vacuum cleaner floor brush.

[0019] 2. In the present invention, the laser emission angle is extremely small, and the light beam can be highly concentrated and directed. Therefore, using laser as a light source can overcome the disadvantage of light beam dispersion, and the discrimination degree is high in the process of identifying whether the floor is a carpet. In addition, isolation measures are taken for the laser probe and the photoresistor assembly to prevent the photoresistor from being disturbed by ambient light.

[0020] 3. In the present invention, the detection results of the photoresistor sensor are filtered and anti-vibration processed, which can eliminate bad values ​​caused by vibration during the operation of the vacuum cleaner and effectively avoid misjudgment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 The system architecture diagram of a vacuum cleaner site identification system.

[0023] Figure 2 The main program flow chart of a control method of a vacuum cleaner site identification system.

[0024] Figure 3 The present invention is a flow chart of anti-vibration filtering for a control method of a vacuum cleaner site identification system. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Example 1

[0028] See also Figure 1-2 In one aspect, the present invention provides a vacuum cleaner site identification system, comprising:

[0029] A laser probe for emitting light toward a working surface;

[0030] A photoresistor module, comprising a photoresistor and a fixed resistor connected in series, wherein the photoresistor is used to receive light emitted by the laser probe and reflected by the working ground, so as to detect the reflective characteristics of the working ground to the light;

[0031] A piezoelectric sensor is disposed at the bottom of the floor brush of the vacuum cleaner, and the piezoelectric sensor is used to detect the contact pressure with the working floor;

[0032] The single chip microcomputer is used to generate a working ground recognition result according to the voltage value shared by the photoresistor and the pulse signal fed back by the piezoelectric sensor, and adjust the suction force of the main motor of the vacuum cleaner and the speed of the floor brush motor according to the recognition result.

[0033] The site recognition system uses a set of laser probes and photoresistor components, and a piezoelectric sensor to identify the ground state, and can distinguish the ground into three states: tile floor, sisal carpet, and non-sisal carpet. And in order to avoid misjudgment in the recognition process, corresponding hardware measures to prevent ambient light interference and software measures to eliminate vibration bad values ​​are taken. On the basis of accurate recognition of the ground, the main motor suction and floor brush motor speed are automatically adjusted by comprehensively considering energy consumption, cleaning effect, and protection of the roller brush and the ground, so as to automatically adopt corresponding control strategies based on the recognition results of the ground, which can effectively avoid excessive wear between the sisal carpet and the vacuum cleaner floor brush due to excessive friction.

[0034] The laser emission angle is extremely small, and the light beam can be highly concentrated and directed. Therefore, using laser as a light source can overcome the disadvantage of light beam dispersion and have a high degree of distinction in the process of identifying whether the floor is a carpet. In addition, isolation measures are taken for the laser probe and photoresistor components to prevent the photoresistor from being disturbed by ambient light.

[0035] On the other hand, the present invention further discloses a control method of the vacuum cleaner site identification system as described above, comprising the following steps:

[0036] S1. Preliminary identification: The laser probe emits light toward the working ground, the photoresistor receives the light reflected by the working ground, and the single-chip microcomputer detects whether the voltage shared on the photoresistor is lower than the set threshold, and obtains the preliminary identification result of the working ground;

[0037] S2, secondary identification: The single chip microcomputer obtains the secondary identification result of the working ground according to the pulse signal fed back by the piezoelectric sensor;

[0038] S3, control adjustment: based on the preliminary recognition results and the secondary recognition results, the single chip microcomputer controls the suction power of the main motor of the vacuum cleaner and the speed of the floor brush motor according to a predetermined strategy.

[0039] In step S1, the single chip microcomputer detects that the voltage shared by the photoresistor is lower than the set threshold, and the identification result is a tile floor; detects that the voltage shared by the photoresistor is higher than the set threshold, and the identification result is a carpet.

[0040] In step S2, the single chip microcomputer detects the periodic pulse signal fed back by the piezoelectric sensor, and the identification result is sisal carpet; if the periodic pulse signal is not detected, the identification result is non-sisal carpet.

[0041] In step S3, the preliminary recognition result of the working floor is a tile floor, and the single-chip microcomputer controls the main motor and the floor brush motor of the vacuum cleaner to maintain the reference speed; the secondary recognition result of the floor is a non-sisal carpet, and with reference to the reference speeds of the main motor and the floor brush motor, the single-chip microcomputer controls the main motor of the vacuum cleaner to increase the speed and the floor brush motor to maintain the speed; the secondary recognition result of the floor is a sisal carpet, and with reference to the reference speeds of the main motor and the floor brush motor, the single-chip microcomputer controls the main motor of the vacuum cleaner to increase the speed and the floor brush motor to reduce the speed.

[0042] According to the recognition results, the corresponding control strategy is automatically adjusted by software in the single chip microcomputer. The floor brush motor is used to control the rotation of the roller brush, and the main motor adjusts the vacuum suction of the vacuum cleaner through the speed.

[0043] Therefore, taking the tile floor as a reference benchmark, when the vacuum cleaner brush works on non-sisal carpets (wool, chemical fiber), the vacuum cleaner main motor increases the speed to vacuum, increase the suction force, and improve the cleaning effect, and the roller brush does not need to reduce the speed; when working on sisal carpets, the vacuum cleaner main motor increases the speed to vacuum, and at the same time the floor brush motor reduces the speed to avoid excessive friction causing excessive wear between the sisal carpet and the floor brush.

[0044] Working principle: The photoresistor and the fixed resistor constitute a photoresistor module, which is powered by the microcontroller power supply. The laser probe and the photoresistor module are used to detect the reflection characteristics of the ground to light. The laser probe is used as a light source to generate laser. The surface of the tile floor is smooth, which can be considered as mirror reflection. Most of the light is reflected to the photoresistor, resulting in a significant decrease in the resistance of the photoresistor; the surface of the carpet is rough, which diffusely reflects the light. The light energy that can be reflected to the photoresistor is limited, and the resistance of the photoresistor will not drop significantly.

[0045] When the resistance of the photoresistor decreases, the voltage it shares will also decrease. By detecting the voltage value shared on the photoresistor, it can be identified whether the floor is carpeted. When the floor is a tile floor, the voltage shared on the photoresistor will be lower than the set threshold, and when the floor is a carpet, the voltage shared on the photoresistor will be higher than the set threshold.

[0046] Piezoelectric sensors have good high-frequency response and are not suitable for measuring static physical quantities. Piezoelectric sensors can be used to detect whether the working floor is a sisal carpet. The detection principle is: due to the support of the floor brush, on the smooth working floor of the tile floor, the piezoelectric sensor will not touch the ground and there will be no signal output; on the chemical fiber pile carpet or wool carpet, the piezoelectric sensor is in continuous contact with the chemical fiber pile or wool, and its force change is limited. Even if an electrical signal is generated, it is very weak; the sisal carpet adopts a weaving process, and the hemp rope is thicker and harder. After weaving, there are obvious alternating concave and convex parts on the surface of the carpet. When the vacuum cleaner runs to the surface of the sisal carpet, when the piezoelectric sensor passes over the raised part of the carpet, the piezoelectric sensor contacts the carpet and is subjected to pressure. When the piezoelectric sensor passes over the concave part of the carpet, the piezoelectric sensor does not contact the carpet and is not subjected to pressure.

[0047] Therefore, on the sisal carpet, the pressure on the piezoelectric sensor changes periodically, thus generating a periodic pulse signal.

[0048] Example 2

[0049] This embodiment further makes the following improved technical solutions on the basis of the above embodiments: the laser probe and the photoresistor are both arranged in a semi-enclosed shell, the side walls and the top wall of the semi-enclosed shell are made of opaque material, and the bottom of the semi-enclosed shell is provided with an opening facing the working ground.

[0050] Laser is used as the light source because the laser emission angle is extremely small, and the light beam can be highly concentrated and directed, which can overcome the disadvantage of light beam dispersion. If LED spotlights or ordinary infrared rays are used as the light source, the light beam itself is relatively dispersed, and further disperses after being reflected by the ground, resulting in little difference in the reflected light illumination detected by the photoresistor on the ground in different states, and the discrimination is not high enough, which can easily lead to misjudgment.

[0051] At the same time, the laser probe and the photoresistor are arranged in a semi-enclosed shell surrounded by opaque material. The semi-enclosed shell only leaves the bottom open and faces the ground to achieve isolation from ambient light and ensure that the photoresistor is not exposed to external light.

[0052] In addition, a semi-enclosed shell is arranged on the side of the vacuum cleaner floor brush, which is convenient for disassembly, assembly and maintenance of the laser recognition module composed of the laser probe and the photoresistor.

[0053] Example 3

[0054] See attached Figure 3 Based on the above embodiments, this embodiment further provides the following improved technical solutions: In step S1, the single chip microcomputer performs filtering and anti-vibration processing on the detection result of the photoresistor.

[0055] Specifically, in step S1, the single chip microcomputer reads the voltage values ​​shared on the photoresistor n times in sequence during the sampling process and sorts them according to the voltage values, removes the first n1 sampling values ​​with larger values, and averages the remaining n2 sampling values, n>n1>n2, to obtain the sampling result.

[0056] For example, during the sampling process of the single-chip microcomputer, the voltage values ​​shared on the photoresistor are read 10 times in sequence and sorted, and then the 7 larger sampling values ​​are eliminated and the 3 smaller sampling values ​​are retained to calculate the average.

[0057] Alternatively, during the sampling process of the single chip microcomputer, the shared voltage values ​​on the photoresistor are read 10 times in sequence and sorted, and then the 6 larger sampling values ​​are eliminated and the smaller 4 sampling values ​​are retained to calculate the average.

[0058] Filtering and anti-vibration processing are performed on the detection results of the photoresistor sensor to eliminate bad values ​​caused by vibration during the operation of the vacuum cleaner and effectively avoid misjudgment.

[0059] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A vacuum cleaner site identification system, characterized in that: include: A laser probe for emitting light toward a working surface; A photoresistor module, comprising a photoresistor and a fixed resistor connected in series, wherein the photoresistor is used to receive light emitted by the laser probe and reflected by the working ground, so as to detect the reflective characteristics of the working ground to the light; A piezoelectric sensor is disposed at the bottom of the floor brush of the vacuum cleaner, and the piezoelectric sensor is used to detect the contact pressure with the working floor; The single chip microcomputer is used to generate a working ground recognition result according to the voltage value shared by the photoresistor and the pulse signal fed back by the piezoelectric sensor, and adjust the suction force of the main motor of the vacuum cleaner and the speed of the floor brush motor according to the recognition result.

2. A vacuum cleaner site identification system according to claim 1, characterized in that: The laser probe and the photoresistor are both arranged in a semi-enclosed shell, the side walls and the top wall of the semi-enclosed shell are made of opaque material, and the bottom of the semi-enclosed shell is provided with an opening facing the working ground.

3. A vacuum cleaner site identification system according to claim 3, characterized in that: The semi-enclosed shell is arranged on the side of the floor brush of the vacuum cleaner.

4. A control method for a vacuum cleaner site identification system according to any one of claims 1 to 3, characterized in that: The following steps are involved: S1. Preliminary identification: The laser probe emits light toward the working ground, the photoresistor receives the light reflected by the working ground, and the single-chip microcomputer detects whether the voltage shared on the photoresistor is lower than the set threshold, and obtains the preliminary identification result of the working ground; S2, secondary identification: The single chip microcomputer obtains the secondary identification result of the working ground according to the pulse signal fed back by the piezoelectric sensor; S3, control adjustment: based on the preliminary recognition results and the secondary recognition results, the single chip microcomputer controls the suction power of the main motor of the vacuum cleaner and the speed of the floor brush motor according to a predetermined strategy.

5. The control method of the vacuum cleaner site recognition system according to claim 4, characterized in that: In step S1, the single chip microcomputer detects that the voltage shared by the photoresistor is lower than the set threshold, and the identification result is a tile floor; detects that the voltage shared by the photoresistor is higher than the set threshold, and the identification result is a carpet.

6. The control method of the vacuum cleaner site recognition system according to claim 4, characterized in that: In step S1, the single chip microcomputer performs filtering and anti-vibration processing on the detection result of the photoresistor.

7. The control method of the vacuum cleaner site recognition system according to claim 6, characterized in that: In step S1, the single chip microcomputer reads the voltage values ​​shared on the photoresistor n times in sequence during the sampling process and sorts them according to the voltage values, removes the first n1 sampling values ​​with larger values, and averages the remaining n2 sampling values, n>n1>n2, to obtain the sampling result.

8. The control method of the vacuum cleaner site recognition system according to claim 4, characterized in that: In step S2, the single chip microcomputer detects the periodic pulse signal fed back by the piezoelectric sensor, and the identification result is a sisal carpet; if the periodic pulse signal is not detected, the identification result is a non-sisal carpet.

9. The control method of the vacuum cleaner site recognition system according to claim 4, characterized in that: In step S3, the preliminary recognition result of the working floor is a tile floor, and the single-chip microcomputer controls the main motor and the floor brush motor of the vacuum cleaner to maintain a reference speed; the secondary recognition result of the floor is a non-sisal carpet, and with reference to the reference speeds of the main motor and the floor brush motor, the single-chip microcomputer controls the main motor of the vacuum cleaner to increase the speed and the floor brush motor to maintain the speed; the secondary recognition result of the floor is a sisal carpet, and with reference to the reference speeds of the main motor and the floor brush motor, the single-chip microcomputer controls the main motor of the vacuum cleaner to increase the speed and the floor brush motor to reduce the speed.

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