Dual-mode adaptive speed control method based on single hall sensor and oral care device

Abstract

The application discloses a kind of dual-mode adaptive speed regulation control methods based on single hall sensor, comprising the following steps: S1: by single full polarity absolute value linear hall sensor in equipment main body real-time acquisition brush head docking end magnetic field intensity analog voltage signal;S2: the magnetic field intensity analog voltage signal collected with preset threshold is compared by main control module, determine empty magnetic field, low magnetic field, medium magnetic field, high magnetic field state;S3: according to the magnetic field grading determination result, automatically match corresponding working mode and corresponding rotating speed;S4: main control module controls dual-mode drive module action, realizes the working mode quick response and automatic switching within 0.5s~1s;Also disclosed is a kind of oral care equipment to realize dual-mode adaptive speed regulation control method.The application is matched with brush head docking end different specifications magnet by single hall sensor, completes four kinds of brush head accurate grading identification, realizes high-frequency sweep vibration, multi-gear rotary dual-mode intelligent switching.

Description

Technical Field

[0001] This invention relates to the field of dental equipment, and more particularly to a dual-mode adaptive speed control method and dental care equipment based on a single Hall sensor. Background Technology

[0002] Electric toothbrushes, as mainstream intelligent oral care devices, are widely used in daily oral cleaning and professional oral care scenarios. However, conventional electric toothbrushes on the market generally suffer from many shortcomings, such as low levels of intelligence, cumbersome operation procedures, and poor adaptability to various working conditions. After changing to brush heads with different functions, users often need to manually switch the device's working speed by pressing a button. This can easily lead to mismatches between the device's speed, working mode, and brush head functions, resulting in a series of problems such as splashing of oral care products, insufficient oral cleaning power, and incomplete removal of stubborn stains. This is particularly unfriendly to users with weaker operating skills, such as the elderly and children, and presents a high barrier to entry for users.

[0003] Although there are existing applications of permanent magnets combined with Hall effect sensors (such as CN106153105A, published on November 23, 2016, a device and method for detecting brushing force, frequency and distance; and CN104619212A, published on May 13, 2015, a resonant-driven electric toothbrush with pressure sensing capability using a Hall effect sensor), the sensing logic of these products is only a simple judgment of the presence or absence of a magnetic field. They can only achieve simple recognition and output a fixed speed / frequency, with a single functional design, and cannot adjust the working conditions according to the differences in brush head functions. At the same time, most existing toothbrushes with brush head recognition functions use multi-sensor arrays, which are complex in structure, expensive, and susceptible to interference from external magnetic fields; and traditional products are mostly single sweeping vibration mode or single rotation mode, unable to achieve intelligent switching between the two modes, making it difficult to meet the needs of refined oral care.

[0004] Traditional 360° rotating brush heads are less effective at cleaning between teeth, and the fixed rotation speed cannot meet the specific work requirements of different brush heads such as oral care, daily cleaning, and deep stain removal, ultimately resulting in a significant reduction in the cleaning, dental care, and medication treatment effects. Summary of the Invention

[0005] To overcome the above-mentioned shortcomings, the present invention aims to address the deficiencies of existing technologies, such as complex sensing schemes, poor recognition stability, single working mode, inability to adapt the speed to the brush head function as needed, and the fact that traditional Hall effect sensors and magnets can only achieve fixed working condition outputs. The invention provides a dual-mode oral care device based on a single Hall sensor and its adaptive speed control method.

[0006] To achieve the above objectives, the technical solution adopted by this invention is: a dual-mode adaptive speed control method based on a single Hall sensor, comprising the following steps:

[0007] S1: The magnetic field strength analog voltage signal at the brush head docking end is collected in real time by a single all-polarity absolute linear Hall sensor inside the main body of the device;

[0008] S2: The main control module compares the collected magnetic field strength analog voltage signal with the preset threshold and classifies it into an empty magnetic field, a low magnetic field, a medium magnetic field, and a high magnetic field state.

[0009] S3: Based on the magnetic field classification result, the corresponding working mode and dedicated rotation speed are automatically matched to achieve adaptive adaptation between working conditions and brush head functions. The high-frequency sweeping mode and the rotation mode operate mutually exclusively.

[0010] The empty magnetic field corresponds to a high-frequency sweeping vibration mode; it is used to compensate for the weak cleaning ability of the 360-degree rotating structure between teeth, and to achieve deep cleaning of the gaps between teeth.

[0011] The low magnetic field preferably corresponds to a first preset ultra-low speed rotation mode of 80-150 r / min;

[0012] The medium magnetic field is preferably corresponding to the second preset medium-speed rotation mode of 400–600 r / min, and is paired with a cleaning brush head; while ensuring sufficient cleaning power, it reduces damage to the gums and tooth enamel.

[0013] The high magnetic field is preferably corresponding to the third preset high-speed rotation mode of 2000–2500 r / min, which is used for deep cleaning of tooth surfaces, interdental spaces, and deep tooth sockets;

[0014] S4: The main control module controls the sweeping drive unit and rotation drive unit of the dual-mode drive module to perform corresponding actions, realizing rapid response and automatic switching of working modes within 0.5s to 1s.

[0015] Preferably, the vibration frequency of the high-frequency sweeping mode matches the combined working condition of high-frequency vibration and reciprocating oscillation. High frequency refers to 20,000 to 40,000 times per minute. When the Hall sensor detects a non-empty magnetic field state, it automatically shields the sweeping mode and only enables the rotation mode, so as to realize the mutual exclusion operation of the high-frequency sweeping mode and the rotation mode.

[0016] Preferably, the rotation speed of the first preset ultra-low speed rotation mode corresponding to the low magnetic field is preferably 80-150 r / min, and it is paired with a brush head slow-release chamber structure;

[0017] It can be used with anti-allergy slow-release care brush heads to achieve gentle gum care and splash-free medication treatment.

[0018] Preferably, the rotation speed of the second preset medium-speed rotation mode corresponding to the medium magnetic field is 400-600 r / min; this is the optimal working condition for daily oral cleaning, with strong cleaning power and low damage to the gums and enamel, balancing daily cleaning efficiency and tooth protection effect.

[0019] Preferably, the rotation speed of the third preset high-speed rotation mode corresponding to the high magnetic field is 2000-2500 r / min, which is suitable for deep stain removal brush heads and meets the needs of tooth surface cleaning and polishing.

[0020] Preferably, the main control module has a built-in ADC sampling circuit and a hysteresis comparison algorithm processing unit. It samples the magnetic field signal with a period of 10ms. After the signal amplitude is determined to be stable multiple times, the working mode and speed switching are triggered. The recognition accuracy is not less than 98%, and the anti-interference capability is far superior to conventional Hall recognition schemes.

[0021] Preferably, the main body of the device is equipped with a manual override button, which allows users to make personalized fine adjustments to the speed within ±10% of the automatically matched speed range.

[0022] An oral care device for implementing the above-mentioned dual-mode adaptive speed control method based on a single Hall sensor includes:

[0023] The main body of the device integrates a main control module, a power supply module, and a dual-mode drive module. The dual-mode drive module includes a sweeping drive unit and a rotation drive unit. A Hall sensor is installed on the brush head connector of the main body of the device. The Hall sensor is an all-polarity absolute value linear Hall sensor.

[0024] There are four types of replaceable brush head assemblies. Among them, the third type of replaceable brush head assembly has a low-intensity permanent magnet, a medium-intensity permanent magnet, and a high-intensity permanent magnet at the interface with the main body of the device. The other type of replaceable brush head assembly does not have a permanent magnet at the interface with the main body of the device. The four types of replaceable toothbrush head assemblies correspond to four magnetic field recognition states.

[0025] Preferably, the sensing center of the Hall sensor coincides with the central axis of the cylindrical permanent magnet on the brush head;

[0026] The permanent magnet is cylindrical and axially magnetized, with magnetic lines of force passing perpendicularly through the sensing surface of the Hall sensor, forming a single-point axial precision magnetic field detection structure. This eliminates recognition interference caused by assembly deviations.

[0027] Preferably, the permanent magnet is a neodymium iron boron magnet.

[0028] Preferably, the dual-mode drive module adopts a coaxial dual-rotor motor structure, or a combination structure of an independent vibration motor and an independent rotary motor. The high-frequency sweeping drive unit and the rotary drive unit are independently controlled by the main control module through an independent control circuit of a MOS transistor.

[0029] Preferably, the device body is equipped with a manual override button on the outside, which allows for personalized fine-tuning within the automatically matched speed range of ±10%. This ensures that the sweeping mode and the rotation mode operate independently and mutually exclusively, without any conflict in operating conditions.

[0030] Preferably, a brush head assembly is mounted on the brush head release chamber structure, the brush head release chamber is a flexible cavity, and has a through hole leading to the brush head assembly.

[0031] The beneficial effects of the dual-mode adaptive speed control method based on a single Hall sensor and the oral care device of this invention are:

[0032] Firstly, this application uses only a single omnipolar, linear output Hall sensor to acquire the magnetic field information of the brush head docking end in real time and output the corresponding Hall output voltage signal. This signal is linearly related to the magnetic induction intensity and serves as the basic data for identification.

[0033] Secondly, the main control module compares the Hall output voltage with the preset threshold and classifies it into four states: empty magnetic field, low magnetic field, medium magnetic field, and high magnetic field.

[0034] Third, it automatically matches and drives two mutually exclusive working modes (sweeping mode and rotation mode) according to the magnetic field state, and achieves rapid mode switching within 0.5 s to 1 s; the rotation speed range corresponding to each magnetic field state is as follows: empty magnetic field - high frequency sweeping (20,000–40,000 times / min), low magnetic field - 80–150 r / min (ultra-low speed rotation), medium magnetic field - 400–600 r / min (medium speed rotation), high magnetic field - 2000–2500 r / min (high speed rotation);

[0035] Fourth, the main control module achieves corresponding actions through the vibration drive unit and rotation drive unit of the dual-mode drive module, and completes rapid mode response and switching within 0.5 s to 1 s. The high-frequency sweep vibration mode will be automatically shielded when a non-empty magnetic field is detected, and only the rotation mode will be activated to ensure that the two modes are mutually exclusive;

[0036] Fifth, hysteresis determination mechanism: The main control module has a built-in ADC sampling circuit that periodically samples the magnetic field signal with a sampling period of 10 ms. After the signal amplitude is determined to be stable after multiple consecutive determinations, the switching is triggered. Independent on and off thresholds are set for different magnetic field states to form a hysteresis range, which improves the switching stability and suppresses jitter.

[0037] Sixth, this application features a manual overdrive button, allowing for ±10% speed fine-tuning within the automatically matched speed range, ensuring users' personalized needs for specific scenarios.

[0038] Seventh, the replaceable brush head assembly has permanent magnets of different intensities (low, medium, and high) at the docking end, as well as a brush head assembly without a permanent magnet; the Hall sensor is aligned with the center line of the brush head magnet, and a cylindrical, axially magnetized permanent magnet is used to achieve single-point axial detection to reduce the impact of assembly tolerances on recognition; neodymium iron boron magnets are preferred as permanent magnet materials to improve magnetic field strength and recognition robustness; the dual-mode drive module can adopt a coaxial dual-rotor motor structure, or a combination structure of an independent vibration motor and an independent rotary motor, and the drive unit is independently controlled by a MOSFET to achieve on / off switching;

[0039] Eighth, this application also includes a durable, flexible brush head slow-release chamber structure, which facilitates the loading of medications, gels, liquids, etc., to achieve the synergistic function of medication and device in corresponding nursing scenarios. Attached Figure Description

[0040] Figure 1 This is a flowchart of the dual-mode adaptive speed control method based on a single Hall sensor in this embodiment;

[0041] Figure 2 This is a simplified control flowchart of the control module of the oral care device in this embodiment;

[0042] Figure 3 This is a structural diagram of the oral care device in this embodiment;

[0043] Figure 4 For daily cleaning of non-magnetic brush heads using vibration;

[0044] Figure 5 This is a non-magnetic, vibrating, simple care brush head.

[0045] Figure 6 For use with a non-magnetic, vibrating, slow-release chamber care brush head;

[0046] Figure 7 For daily rotating cleaning of medium-magnetic components;

[0047] Figure 8 It features a low-magnetic, rotating, easy-care brush head.

[0048] Figure 9 The brush head is designed for low-magnetic rotating slow-release chamber care;

[0049] Figure 10 High-magnetic rotating tooth surface polishing brush head;

[0050] Figure 11 High-magnetic rotating interdental polishing brush head;

[0051] Figure 12 It is a high-magnetic rotating tooth socket polishing brush head.

[0052] In the attached image:

[0053] 1. Power supply module; 2. Main control module; 3. Replaceable brush head assembly; 4. Hall sensor; 5. ADC sampling circuit; 6. Hysteresis comparison algorithm processing unit; 7. Dual-mode drive module; 8. Independent control circuit for MOSFETs; 9. Permanent magnet; 10. Main body of the device; 11. Manual overdrive button. Detailed Implementation

[0054] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention.

[0055] See Figure 1 As shown, this embodiment discloses a dual-mode adaptive speed control method based on a single Hall sensor, including the following steps:

[0056] S1: The analog voltage signal of the magnetic field strength at the brush head docking end is collected in real time by a single all-polarity absolute linear Hall sensor 4 inside the main body 10. The characteristic of the Hall sensor 4 is that its output voltage is proportional to the magnetic induction intensity, thereby linearly converting the magnetic field strength of the permanent magnet 9 built into different brush heads into a continuously changing analog voltage value, providing an accurate data basis for subsequent magnetic field classification.

[0057] S2: The main control module 2 compares the collected magnetic field strength analog voltage signal with the preset threshold and classifies it into four magnetic field states: empty magnetic field, low magnetic field, medium magnetic field, and high magnetic field.

[0058] S3: Based on the magnetic field classification result, the corresponding working mode and exclusive rotation speed are automatically matched to achieve adaptive matching between working conditions and brush head functions. The high-frequency sweeping mode and the rotation mode operate mutually exclusively.

[0059] An empty magnetic field corresponds to a high-frequency sweeping vibration mode, corresponding to Figure 4 , Figure 5 , Figure 6 Brush head;

[0060] The low magnetic field corresponds to the first preset ultra-low speed rotation mode of 80-150 r / min. Figure 8 , Figure 9 Brush head;

[0061] The medium magnetic field corresponds to the second preset medium-speed rotation mode of 400–600 r / min. Figure 7 Brush head;

[0062] The high magnetic field corresponds to the third preset high-speed rotation mode of 2000–2500 r / min. Figure 10 , Figure 11 , Figure 12 Brush head.

[0063] S4: The main control module 2 controls the sweeping drive unit and the rotation drive unit of the dual-mode drive module to perform corresponding actions, realizing rapid response and automatic switching of working modes within 0.5s to 1s.

[0064] Among them, the vibration frequency of the high-frequency sweeping mode is matched with the combined working conditions of high-frequency vibration and reciprocating oscillation. High frequency refers to 20,000 to 40,000 times / minute. When the Hall sensor 4 detects a non-empty magnetic field state, it automatically shields the sweeping mode and only enables the rotation mode, so as to realize the mutual exclusion operation of the high-frequency sweeping mode and the rotation mode.

[0065] Furthermore, the main control module 2 incorporates an ADC sampling circuit 5 and a hysteresis comparison algorithm processing unit. It samples the magnetic field signal at 10ms intervals, and triggers the switching of operating mode and speed only after the signal amplitude has stabilized after multiple consecutive checks. This hysteresis comparison algorithm establishes a stable "hysteresis range" by setting different on and off thresholds for each magnetic field state determination. When the magnetic field strength fluctuates near the critical point between two modes due to assembly tolerances or slight jitter, this algorithm effectively prevents frequent jumps (i.e., "jitter") between the two operating modes, ensuring the stability and uniqueness of mode switching, thereby significantly improving the user experience. For example: "Set the on threshold to V_on, the off threshold to V_off, and V_on > V_off."

[0066] The main body of the device 10 is equipped with a manual override button 11, which allows users to make personalized fine adjustments to the speed within ±10% of the automatically matched speed range.

[0067] like Figure 2 , Figure 3 As shown, this embodiment also discloses an oral care device for implementing the above-mentioned dual-mode adaptive speed control method based on a single Hall sensor, comprising:

[0068] The main body 10 of the device integrates a main control module, a power supply module and a dual-mode drive module. The dual-mode drive module includes a sweeping drive unit and a rotation drive unit. A Hall sensor 4 is installed on the brush head connector of the main body 10. The Hall sensor 4 is an all-polarity absolute value linear Hall sensor 4.

[0069] The first structure is a coaxial dual-rotor motor structure. This structure integrates rotation and sweeping functions into a single motor, which includes a shared stator and two independently controllable rotors. One rotor (rotating rotor) is connected to the central spindle of the motor and drives the brush head to rotate 360°; the other rotor (sweeping rotor) is connected to a hollow shaft fitted outside the spindle and drives the brush head to oscillate at high frequency. The brush head connector is coupled to both the spindle and the hollow shaft. The main control module 2 selectively energizes one of the rotors through the independent control circuit 8 via a MOSFET, thereby achieving mode switching and mutual exclusion.

[0070] The second structure is a combination of an independent vibration motor and an independent rotary motor. This structure uses two physically separate motors. One is a standard rotary motor, whose output shaft is directly or via a transmission mechanism connected to the brush head connector, responsible for providing rotational power. The other is a vibration motor (such as an eccentric wheel motor), which is fixed inside the main body 10 of the device through an elastic suspension structure, and the vibration force it generates is directly transmitted to the brush head connector. The main control module 2 switches between rotation mode and sweeping mode by independently controlling the start and stop of the two motors.

[0071] There are four types of replaceable brush head assemblies 3. Three types of replaceable brush head assemblies 3 are equipped with corresponding low-strength permanent magnets 9, medium-strength permanent magnets 9, and high-strength permanent magnets 9 at their docking ends with the main body of the device 10. The other type of replaceable brush head assembly 3 is not equipped with permanent magnets 9 at its docking end with the main body of the device 10. The four types of replaceable toothbrush head assemblies 12 correspond to four magnetic field recognition states.

[0072] In this embodiment, the sensing center of the Hall sensor 4 coincides with the central axis (i.e., the center line) of the cylindrical permanent magnet on the brush head;

[0073] The permanent magnet 9 is cylindrical and is axially magnetized. The magnetic lines of force pass perpendicularly through the sensing surface of the Hall sensor 4, forming a single-point axial precision magnetic field detection structure.

[0074] Among them, permanent magnet 9 is a neodymium iron boron magnet. This embodiment uses neodymium iron boron magnets, which have high magnetic field strength and large magnetic field gradient. When used with a Hall sensor, it will not be falsely triggered by interference. If a weak ferrite magnet is used, even slight external electromagnetic interference will cause the Hall sensor signal to fluctuate erratically.

[0075] The dual-mode drive module adopts a coaxial dual-rotor motor structure. The high-frequency sweeping drive unit and the rotary drive unit are independently controlled by the main control module through the independent control circuit of MOS transistor 8.

[0076] In addition, a manual override button 11 is provided on the outside of the main body 10, which can make fine adjustments of ±10% within the automatically matched speed range. Among them, the brush head slow release chamber structure is equipped with a brush head assembly. The brush head slow release chamber is a flexible cavity and has a through hole leading to the brush head assembly.

[0077] The brush head assembly in this embodiment includes:

[0078] like Figure 4 The daily sweeping and vibration cleaning brush head shown (full bristles, 20,000-40,000 times / minute), such as... Figure 5 The sweeping and vibrating simple care brush head shown (with two fewer bristles in the middle, 20,000-40,000 times / minute), as... Figure 6 The shown is a vibrating belt slow-release chamber care brush head (with 8 micropores, 20,000-40,000 vibrations / minute), such as... Figure 7 The daily rotating cleaning brush head shown (full-length bristles, available in soft and hard versions, 400-600 rpm) is as follows: Figure 8 The rotating simple care brush head shown (no bristles in the middle, 80-150 rpm) is as follows: Figure 9 The rotating slow-release chamber care brush head shown (with 3 micropores, 80-150 r / min) is as follows: Figure 10 The rotary tooth polishing brush head shown (2000-2500 r / min) is as follows: Figure 11 The rotary interdental polishing brush head shown (2000-2500 r / min) and as shown Figure 12 Rotary dental socket polishing brush head (2000-2500r / min).

[0079] The following are four specific examples of application implementations:

[0080] Application Example 1: Non-magnetic Vibrating Brush Head

[0081] Users install a vibrating brush head without built-in magnets. Figure 4 The brush head and handle are inserted into the motor spindle. When the Hall sensor detects an empty magnetic field, the main control module automatically activates the high-frequency sweeping vibration mode and simultaneously cuts off the power to the rotary motor. This mode specifically compensates for the weakness of the 360° rotating structure in cleaning between teeth, achieving deep cleaning. In addition to using the daily non-magnetic sweeping vibration cleaning brush head, this mode can also be combined with the non-magnetic sweeping vibration simple care brush head and the non-magnetic sweeping vibration slow-release care brush head. The non-magnetic sweeping vibration simple care brush head can hold ointment or gel medications, while the non-magnetic sweeping vibration slow-release care brush head can hold liquid, ointment, or gel medications, which can be used for tooth sensitivity repair.

[0082] Application Example 2: Low-Magnetic Anti-Allergy Care Brush Head

[0083] The user installs the slow-release care brush head with a built-in low-intensity permanent magnet. Two protruding locking points at the bottom of the brush handle are inserted into the two slots on the main body. After fully inserting, rotate the brush head in the opposite direction to ensure the central axis of the permanent magnet at the bottom of the handle passes perpendicularly through the Hall sensor sensing surface on the main body's circuit board. The sensor on the main body detects a low magnetic field, and the main control module automatically activates the rotation mode, locking the speed within the 80-150 rpm range. This low-speed operation (80-150 rpm) combined with the slow-release chamber design ensures even application of medication without splashing, gently protecting gums and suitable for allergy-related care scenarios.

[0084] This mode is mainly used for low-magnetic rotating simple care brush heads and low-magnetic rotating slow-release care brush heads. The low-magnetic rotating simple care brush head can hold ointments or gels; the low-magnetic rotating slow-release care brush head can hold liquid, ointment, or gel medications, which can be used for tooth sensitivity repair.

[0085] Application Example 3: Zhongci Daily Cleaning Brush Head

[0086] When the user installs the medium magnetic brush head, following the same installation method as in Example 2, the system recognizes it as a medium magnetic field and automatically matches a medium rotation speed of 400-600 rpm. 400-600 rpm is the optimal speed for daily cleaning brush heads, providing outstanding cleaning power while reducing wear and damage to gums and tooth enamel, balancing cleaning efficiency and user comfort, making it suitable for daily use.

[0087] Application Example 4: High Magnetic Depth Stain Removal Brush Head

[0088] When the user installs the high-magnetic brush head, following the same installation method as in Example 2, the system recognizes it as a high magnetic field and automatically matches a high-speed rotation of 2000-2500 rpm. 2000-2500 rpm is the optimal speed setting for cleaning brush heads on tooth surfaces, between teeth, and in tooth sockets, providing powerful mechanical friction to remove stubborn stains.

[0089] Compared to existing commercially available Hall sensor and magnet combinations that can only fix the rotation speed or only output frequency, this embodiment utilizes magnetic field strength graded identification and a single Hall sensor combined with a dual working mode mutually exclusive switching mode to combine high-frequency sweeping vibration and 360° rotation functions, making up for the shortcomings of rotating brush heads in cleaning between teeth, and the functional coverage is far greater than that of traditional products.

[0090] The working conditions and brush head functions in this embodiment are deeply matched, abandoning the one-size-fits-all fixed speed design. The optimal speed is customized for each of the four types of brush heads: 80-150r / min ultra-low speed for drug care and splash prevention, 400-600r / min medium speed for daily cleaning and dental care, 2000-2500r / min high speed for deep stain removal, and high-frequency vibration for cleaning between teeth. Each speed and each mode is specifically optimized for the corresponding usage scenario, greatly improving the usage effect.

[0091] This embodiment uses only a single all-polarity absolute linear Hall sensor to replace the existing mainstream multi-sensor array, which reduces the complexity of component structure and assembly process, lowers costs, and, in conjunction with a centrally aligned mounting structure and a hysteresis comparison algorithm processing unit, provides strong resistance to magnetic field interference and assembly deviation, and ensures stable and reliable identification.

[0092] In this embodiment, after replacing the replaceable brush head assembly, the system automatically completes recognition, mode switching, and speed adjustment without requiring manual button operation by the user, making it suitable for use by various groups such as the elderly and children.

[0093] This embodiment features four working modes and corresponding speeds, integrating functions for interdental cleaning, daily brushing, anti-allergy medication care, and removal of stubborn stains. The ultra-low speed design meets the requirements of medical-grade oral care, significantly enhancing the product's practicality and market competitiveness.

[0094] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A dual-mode adaptive speed control method based on a single Hall sensor, characterized in that, Includes the following steps: S1: The magnetic field strength analog voltage signal at the brush head docking end is collected in real time by a single all-polarity absolute linear Hall sensor (4) inside the main body (10); S2: The main control module (2) compares the collected magnetic field strength analog voltage signal with the preset threshold and classifies it into four magnetic field states: empty magnetic field, low magnetic field, medium magnetic field, and high magnetic field. S3: Based on the magnetic field classification result, the corresponding working mode and dedicated rotation speed are automatically matched to achieve adaptive adaptation between working conditions and brush head functions. The high-frequency sweeping mode and the rotation mode operate mutually exclusively. The empty magnetic field corresponds to a high-frequency sweeping vibration mode; The low magnetic field corresponds to the first preset ultra-low speed rotation mode; The medium magnetic field corresponds to the second preset medium-speed rotation mode; The high magnetic field corresponds to a third preset high-speed rotation mode; S4: The main control module (2) controls the sweeping drive unit and the rotation drive unit of the dual-mode drive module (7) to perform corresponding actions, so as to realize the rapid response and automatic switching of the working mode within 0.5s to 1s.

2. The dual-mode adaptive speed control method based on a single Hall sensor according to claim 1, characterized in that: The vibration frequency of the high-frequency sweeping mode is matched with the combined working condition of high-frequency vibration and reciprocating oscillation. When the Hall sensor (4) detects a non-empty magnetic field state, it automatically shields the sweeping mode and only enables the rotation mode, so as to realize the mutual exclusion operation of the high-frequency sweeping mode and the rotation mode.

3. The method according to claim 1, characterized in that: The low magnetic field corresponds to the first preset ultra-low speed rotation mode, preferably 80-150 r / min; the medium magnetic field corresponds to the second preset medium speed rotation mode, preferably 400-600 r / min; and the high magnetic field corresponds to the third preset high speed rotation mode, preferably 2000-2500 r / min.

4. The dual-mode adaptive speed control method based on a single Hall sensor according to claim 1, characterized in that: The main control module (2) has a built-in ADC sampling circuit (5) and a hysteresis comparison algorithm processing unit (6). It samples the magnetic field signal with a period of 10ms. After the signal amplitude is determined to be stable multiple times, it triggers the switching of working mode and speed.

5. The dual-mode adaptive speed control method based on a single Hall sensor according to claim 1, characterized in that: The main body of the device (10) is equipped with a manual override button (11), which allows users to make personalized fine adjustments of the speed within the automatically matched speed range by ±10%.

6. An oral care device for implementing the method of any one of claims 1 to 5, characterized in that... :include: The main body of the device (10) integrates a main control module (2), a power supply module (1) and a dual-mode drive module (7). The dual-mode drive module (7) includes a sweeping drive unit and a rotation drive unit. A Hall sensor (4) is installed on the brush head connector of the main body of the device (10). The Hall sensor (4) is an all-polarity absolute value linear Hall sensor (4). There are four types of replaceable brush head assemblies (3). Among them, the three types of replaceable brush head assemblies (3) are provided with corresponding low-strength permanent magnets (9), medium-strength permanent magnets (9), and high-strength permanent magnets (9) at the docking end with the device body (10). The other type of replaceable brush head assembly (3) is not provided with permanent magnets (9) at the docking end with the device body (10). The four types of replaceable toothbrush head assemblies (3) correspond to four magnetic field recognition states respectively.

7. The oral care device according to claim 8, characterized in that: The sensing center of the Hall sensor (4) coincides with the center line of the cylindrical permanent magnet on the brush head; The permanent magnet (9) is cylindrical and axially magnetized. The magnetic lines of force pass perpendicularly through the sensing surface of the Hall sensor (4) to form a single-point axial precision magnetic field detection structure.

8. The oral care device according to claim 8, characterized in that: The permanent magnet (9) is a neodymium iron boron magnet.

9. The oral care device according to claim 8, characterized in that: The dual-mode drive module (7) adopts a coaxial dual rotor motor structure or a combination structure of independent vibration motor and independent rotation motor. The high-frequency sweeping drive unit and the rotation drive unit are independently controlled by the main control module (2) through the independent control circuit (8) of the MOS tube.

10. The oral care device according to claim 8, characterized in that: The device body (10) is equipped with a manual overdrive button (11) on the outside, which can make a fine adjustment of ±10% within the automatically matched speed range.

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