Oral irrigator and control method and control device thereof

Abstract

The invention discloses a water pick and a control method and device thereof, and relates to the technical field of oral cavity cleaning. The oral irrigator control method comprises the steps that when an oral irrigator works in a battery power supply mode, the battery voltage of the oral irrigator is obtained, the working current of a water pump motor of the oral irrigator is obtained, and the output water pressure of the oral irrigator is determined based on the working current; under the condition that the battery voltage is smaller than the first preset voltage and larger than the second preset voltage, the duty ratio of a driving signal of the water pump motor is increased; when the output water pressure is smaller than the first preset water pressure and larger than the second preset water pressure, the duty ratio of a driving signal of the water pump motor is increased; and controlling the oral irrigator to stop working under the condition that the battery voltage is smaller than the second preset voltage and / or the output water pressure is smaller than the second preset water pressure. The invention aims to avoid the situation of insufficient output water pressure caused by insufficient electric quantity of a battery of the oral irrigator, so that the working stability of the oral irrigator is improved.

Description

Technical Field

[0001] This application relates to the technical field of oral hygiene, and more particularly to a water flosser and its control method and control device. Background Technology

[0002] During the use of oral irrigators powered by replaceable or rechargeable batteries, the battery voltage gradually decreases as the battery power is continuously depleted. Since the water pump motor of the oral irrigator is directly driven by the battery voltage, the voltage drop will cause the motor speed to slow down, resulting in unstable or reduced water pressure. Insufficient water pressure may appear even before the battery is completely depleted, making it difficult for users to maintain a consistent cleaning effect, especially in achieving the ideal rinsing intensity in deep oral areas.

[0003] To prevent damage to internal components from forced operation under low voltage, traditional water flossers often automatically shut down before the voltage drops to a safe threshold. This further shortens the effective working time after a single charge, reducing the continuity and satisfaction of the user experience. Therefore, traditional water flossers suffer from poor operational stability when using rechargeable batteries. Summary of the Invention

[0004] The main purpose of this application is to provide a water flosser and its control method and control device, which aims to improve the working stability of the water flosser.

[0005] To achieve the above objectives, this application proposes a method for controlling a water flosser. The water flosser includes a housing, a battery, a nozzle, a water pump, and a water pump motor. The nozzle is disposed within the housing and is detachable from the housing. The water pump and water pump motor are disposed within the housing, and the water pump motor is connected to the water pump drive. The battery is disposed within the housing and is used to power the water flosser. The inlet of the water pump is connected to a water source, and the outlet of the water pump is connected to the nozzle. The method for controlling the water flosser includes: When the water flosser is working and powered by a battery, the battery voltage of the water flosser is obtained, the operating current of the water pump motor of the water flosser is obtained, and the output water pressure of the water flosser is determined based on the operating current. Obtain the model information of the nozzle installed on the housing, and determine the first preset water pressure corresponding to the current state based on the model information and the rinsing mode of the water flosser. The first preset water pressure represents the highest water pressure reference in the target water pressure range corresponding to the current model information and the rinsing mode. When the battery voltage is less than the first preset voltage but greater than the second preset voltage, the duty cycle of the water pump motor drive signal is increased. When the output water pressure is less than the first preset water pressure but greater than the second preset water pressure, the duty cycle of the pump motor drive signal is increased. If the battery voltage is not greater than the second preset voltage and / or the output water pressure is not greater than the second preset water pressure, the oral irrigator shall be controlled to stop working.

[0006] In the aforementioned oral irrigator control method, when the oral irrigator operates in battery-powered mode, the battery voltage and the operating current of the water pump motor are acquired. Based on the operating current, the actual output water pressure is determined. Furthermore, considering the model information of the currently installed nozzle and the user-selected rinsing mode, a suitable target water pressure benchmark (i.e., the first preset water pressure) is set. On this basis, when the battery voltage is detected to drop between the first and second preset voltages, or when the actual output water pressure falls between the first and second preset water pressures, the duty cycle of the water pump motor drive signal is increased to ensure that the output water pressure does not decrease when the battery power drops, thus providing greater stability. Once the battery voltage drops below the second preset voltage or the output water pressure drops below the second preset water pressure, the system stops to prevent ineffective spraying or hardware damage. Thus, this method improves the operational stability of the oral irrigator under battery power.

[0007] In one embodiment, the nozzle has a first sensing identifier, and the housing is provided with an identification module that cooperates with the first sensing identifier; the step of obtaining the model information of the nozzle installed in the housing, and determining the first preset water pressure corresponding to the current state based on the model information and the rinsing mode of the water flosser includes: When the nozzle is installed in the housing, the identification module reads the coded information carried by the first sensing identifier and parses the nozzle model information based on the coded information; Based on the model information and the current rinsing mode of the water flosser, a target water pressure range corresponding to the model information and the current rinsing mode of the water flosser is retrieved from a preset lookup table, and the lower limit of the target water pressure range is used as the first preset water pressure.

[0008] In one embodiment, the water flosser's rinsing modes include a high-pulse mode and a low-pulse mode, and the nozzle model includes at least one of a standard nozzle, an orthodontic nozzle, and a periodontal pocket nozzle; the step of retrieving a target water pressure range corresponding to the model information and the current rinsing mode of the water flosser from a preset lookup table according to the model information and the current rinsing mode of the water flosser, and using the lower limit of the target water pressure range as the first preset water pressure includes: When the nozzle is a standard nozzle and the current flushing mode is high-pulse mode, the corresponding target water pressure range is selected as 60–90 psi, and 60 psi is used as the first preset water pressure; and / or, When the nozzle is a standard nozzle and the current flushing mode is low-pulse mode, the corresponding target water pressure range is selected as 40–60 psi, and 40 psi is used as the first preset water pressure; and / or, When the nozzle is an orthogonal nozzle and the current flushing mode is high-pulse mode, the corresponding target water pressure range is selected as 50–80 psi, and 50 psi is used as the first preset water pressure; and / or, When the nozzle is an orthogonal nozzle and the current flushing mode is low-pulse mode, the corresponding target water pressure range is selected as 30–50 psi, and 30 psi is used as the first preset water pressure; and / or, When the nozzle is a periodontal bag nozzle and the current flushing mode is high-pulse mode, the corresponding target water pressure range is selected as 30–60 psi, and 30 psi is used as the first preset water pressure; and / or, When the nozzle is a periodontal bag nozzle and the current flushing mode is low pulse mode, the corresponding target water pressure range is selected as 20–40 psi, and 20 psi is used as the first preset water pressure.

[0009] In one embodiment, increasing the duty cycle of the water pump motor drive signal when the battery voltage is less than a first preset voltage and greater than a second preset voltage includes: When the battery voltage is less than a first preset voltage but greater than a second preset voltage, a first target duty cycle corresponding to the battery voltage is determined based on a first difference between the battery voltage and the first preset voltage or a second difference between the battery voltage and the second preset voltage. The duty cycle of the drive signal output to the water pump motor is increased according to the first target duty cycle; wherein the first target duty cycle is positively correlated with the first difference, or the first target duty cycle is negatively correlated with the second difference.

[0010] In one embodiment, increasing the duty cycle of the pump motor drive signal when the output water pressure is less than the first preset water pressure but greater than the second preset water pressure includes: When the output water pressure is less than the first preset water pressure but greater than the second preset water pressure, a second target duty cycle corresponding to the output water pressure is determined based on a third difference between the output water pressure and the first preset water pressure or a fourth difference between the output water pressure and the second preset water pressure. The duty cycle of the drive signal output to the water pump motor is increased according to the second target duty cycle; wherein the second target duty cycle is positively correlated with the third difference, or the second target duty cycle is negatively correlated with the fourth difference.

[0011] In one embodiment, the oral irrigator control method further includes: When the battery voltage is less than the first preset voltage and greater than the second preset voltage, and the output water pressure is less than the first preset water pressure and greater than the second preset water pressure, a second target duty cycle corresponding to the output water pressure is determined based on a third difference between the output water pressure and the first preset water pressure or a fourth difference between the output water pressure and the second preset water pressure. The duty cycle of the drive signal output to the water pump motor is increased according to the second target duty cycle; wherein the second target duty cycle is positively correlated with the third difference, or the second target duty cycle is negatively correlated with the fourth difference.

[0012] In one embodiment, the power supply circuit of the water pump motor of the oral irrigator includes a current sampling module. The step of acquiring the operating current of the water pump motor of the oral irrigator and determining the output water pressure of the oral irrigator based on the operating current includes: The power supply current of the water pump motor is collected through the current sampling module; The supply current is filtered and / or converted from analog to digital to obtain the operating current value; The aforementioned operating current value is used as the operating current of the water pump motor. Based on a preset first lookup table, the operating current is converted into the corresponding output water pressure; wherein, the operating current and the output water pressure are positively correlated.

[0013] This application also provides a method for controlling a water flosser. The water flosser includes a housing, a battery, a nozzle, a water pump, and a water pump motor. The nozzle is disposed in the housing and is detachable from the housing. The water pump and water pump motor are disposed inside the housing. The water pump motor is connected to the water pump drive. The battery is disposed in the housing and is used to power the water flosser. The water pump inlet is used to connect to a water source, and the water pump outlet is connected to the nozzle. The method for controlling the water flosser includes: When the water flosser is operating in battery-powered mode, the operating current of the water pump motor of the water flosser is obtained, and the output water pressure of the water flosser is determined based on the operating current. Obtain the model information of the nozzle installed on the housing, and determine the first preset water pressure corresponding to the current state based on the model information and the rinsing mode of the water flosser. The first preset water pressure represents the highest water pressure reference in the target water pressure range corresponding to the current model information and the rinsing mode. When the output water pressure is less than the first preset water pressure but greater than the second preset water pressure, the duty cycle of the pump motor drive signal is increased. If the output water pressure is not greater than the second preset water pressure, the oral irrigator is controlled to stop working.

[0014] In the aforementioned oral irrigator control method, when the oral irrigator operates in battery-powered mode, the operating current of the water pump motor is acquired, and the actual output water pressure is determined based on the operating current. Furthermore, considering the model information of the currently installed nozzle and the user-selected rinsing mode, a suitable target water pressure benchmark (i.e., the first preset water pressure) is set. Based on this, when the actual output water pressure falls between the first and second preset water pressures, the duty cycle of the water pump motor drive signal is increased to ensure that the output water pressure does not decrease even when the battery power drops, thus providing greater stability. Once the output water pressure drops below the second preset water pressure, the machine immediately stops to prevent ineffective spraying or hardware damage. In this way, the method improves the operational stability of the oral irrigator under battery power.

[0015] This application also provides a control device configured to implement the oral irrigator control method as described above.

[0016] This application also provides a dental flosser, which includes a removable battery and a control device as described above. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A flowchart of the first embodiment of the oral irrigator provided in this application; Figure 2 A flowchart of a second embodiment of the oral irrigator provided in this application; Figure 3 A flowchart of the third embodiment of the oral irrigator provided in this application; Figure 4 A flowchart of the fourth embodiment of the oral irrigator provided in this application; Figure 5 A flowchart of the fifth embodiment of the oral irrigator provided in this application; Figure 6 A flowchart of the sixth embodiment of the oral irrigator provided in this application; Figure 7 A flowchart of the seventh embodiment of the oral irrigator provided in this application; Figure 8 A flowchart of the eighth embodiment of the oral irrigator provided in this application.

[0020] The purpose, features, and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0022] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0023] It should be noted that step designations such as S100 and S200 are used in this document for the purpose of more clearly and concisely describing the corresponding content, and do not constitute a substantial limitation on the order. In specific implementation, those skilled in the art may execute S200 first and then S100, etc., but these should all be within the protection scope of this application.

[0024] During the use of oral irrigators powered by replaceable or rechargeable batteries, the battery voltage gradually decreases as the battery power is continuously depleted. Since the water pump motor of the oral irrigator is directly driven by the battery voltage, the voltage drop will cause the motor speed to slow down, resulting in unstable or reduced water pressure. Insufficient water pressure may appear even before the battery is completely depleted, making it difficult for users to maintain a consistent cleaning effect, especially in achieving the ideal rinsing intensity in deep oral areas.

[0025] To avoid damaging internal components by forcing operation under low voltage, traditional water flossers often automatically shut down before the voltage drops to a safe threshold. This further shortens the effective working time after a single charge, reducing the continuity and satisfaction of the user experience. Therefore, traditional water flossers, when using rechargeable batteries, suffer from poor operational stability.

[0026] In response, this application proposes a method for controlling a water flosser. In one embodiment, such as... Figure 1 As shown, the oral irrigator control method includes steps S100 to S500.

[0027] In this embodiment, the water flosser includes a housing, a battery, a nozzle, a water pump, and a water pump motor. The nozzle is disposed within the housing and is detachable from it. The water pump and water pump motor are housed within the housing, with the water pump motor connected to the water pump drive. The battery is located within the housing and powers the water flosser. The water pump's inlet is connected to a water source, and its outlet is connected to the nozzle. The housing has a battery compartment for a rechargeable battery, allowing the water flosser to operate solely on the rechargeable battery power—the aforementioned battery-powered mode. The housing has a mounting position for the nozzle, which can be of various types and is not limited here. Different nozzle types have different water flow rates. The water pump draws water from an external water source (such as an internal water tank or external water pipe), pressurizes it, and delivers it to the nozzle. The water pump motor is installed within the housing and directly connected to the water pump (e.g., via a shaft coupling or gear drive) to drive the water pump. The motor's speed and output torque directly affect the water pump's flow rate and water pressure.

[0028] In this embodiment, step S100 involves obtaining the battery voltage of the water flosser and the operating current of the water pump motor of the water flosser when the water flosser is working and powered by the battery, and determining the output water pressure of the water flosser based on the operating current.

[0029] In this embodiment, step S200 involves obtaining the model information of the nozzle installed on the housing, and determining the first preset water pressure corresponding to the current state based on the model information and the rinsing mode of the water flosser.

[0030] In this embodiment, step S300 involves increasing the duty cycle of the water pump motor drive signal when the battery voltage is less than the first preset voltage but greater than the second preset voltage.

[0031] In this embodiment, step S400 involves increasing the duty cycle of the pump motor drive signal when the output water pressure is less than the first preset water pressure but greater than the second preset water pressure.

[0032] In this embodiment, in step S500, if the battery voltage is not greater than the second preset voltage and / or the output water pressure is not greater than the second preset water pressure, the water flosser is controlled to stop working.

[0033] The first preset water pressure represents the highest water pressure reference in the target water pressure range corresponding to the current model information and the working flushing mode.

[0034] In this application, determining the output water pressure of the water flosser based on the operating current refers to the process of deriving the actual water pressure state from the operating current value of the water pump motor. This can be achieved using a pre-calibrated current-water pressure function, such as using an algorithm built into the control device to calculate the water pressure in real time based on the motor's characteristic parameters. This function can be obtained through experimental calibration. Optionally, a polynomial fitting model can be established based on current and water pressure data under different load conditions. Furthermore, increasing the duty cycle of the water pump motor's drive signal can employ a fixed-step increment strategy. For example, when voltage or water pressure conditions are met, the duty cycle is increased by a preset percentage each time. As one implementation method, the target duty cycle value can be directly obtained by querying a pre-stored step-wise rule table, where the rule table is dynamically updated based on historical operating data, thereby avoiding nonlinear calculations relying on voltage or water pressure differences. This also avoids sudden changes in water pressure that could affect the user experience. The nozzle model information mentioned here is used to identify the physical structural characteristics of the currently installed nozzle, such as standard nozzles, orthodontic nozzles, and periodontal pocket nozzles. Different nozzle models will produce different water flow resistance and jet characteristics under the same driving conditions. The flushing mode represents the working level or function type selected by the user, such as high pulse mode and low pulse mode. Different modes correspond to different target water pressure ranges and pulsation frequencies.

[0035] This embodiment simultaneously acquires battery voltage and water pump motor operating current, and determines the output water pressure based on the operating current, thus realizing the detection of the actual working state of the water flosser and overcoming the limitations of traditional methods that rely solely on battery voltage to determine water pressure. More importantly, the system also introduces the identification of nozzle model information and rinsing mode. Different nozzle models have different flow channel structures and nozzle orifice diameters, directly affecting water flow resistance and jet characteristics; different rinsing modes correspond to different target water pressure ranges. Therefore, during startup or operation, the water flosser reads the model information of the currently installed nozzle and, combined with the user-selected rinsing mode, dynamically determines a first preset water pressure matching the current operating conditions. This first preset water pressure is the maximum value of the target water pressure range, representing the minimum effective water pressure benchmark that needs to be maintained under this nozzle and mode combination. Based on this, the system adjusts the duty cycle of the water pump motor drive signal according to the battery voltage or output water pressure: on the one hand, it actively compensates for the motor speed reduction caused by the voltage drop before the battery voltage drops to a lower level (second preset voltage) to ensure that the output water pressure does not decrease; on the other hand, it directly responds to actual output water pressure changes to ensure stable cleaning results. When any parameter approaches a critical value, operation terminates to protect internal components. This effectively extends the effective working time per charge in battery-powered mode and improves the stability and consistency of the output water pressure.

[0036] In one feasible implementation, when the water flosser operates in battery-powered mode, it first acquires the model information of the currently installed nozzle and the user-selected rinsing mode, and accordingly retrieves the corresponding first preset water pressure from the pre-stored parameter library; simultaneously, it acquires the battery voltage and the operating current of the water pump motor in real time, and converts the operating current into the actual output water pressure. When the battery voltage is detected to be between the first preset voltage (e.g., 3.5V) and the second preset voltage (e.g., 3.0V), the control module automatically increases the duty cycle of the water pump motor drive signal to compensate for the speed loss caused by the voltage drop; similarly, if the actual output water pressure is between the first preset water pressure (e.g., 60psi) and the second preset water pressure (e.g., 40psi), the system will also increase the duty cycle to directly perform closed-loop regulation of the water pressure, ensuring that the rinsing effect is not disturbed.

[0037] For example, when the battery voltage drops to 3.2V (less than 3.5V and greater than 3.0V) during the operation of the water flosser, the control device can calculate the target duty cycle based on the voltage deviation and adjust the drive signal. Simultaneously, if the actual water pressure calculated from the operating current is 50 psi (less than 60 psi and greater than 40 psi), the system will further adjust the duty cycle by combining the water pressure deviation, achieving synergistic compensation in both voltage and water pressure dimensions, thereby more accurately maintaining the target rinsing intensity. Furthermore, if the battery voltage drops below the second preset voltage (e.g., 2.8V) or the output water pressure is lower than the second preset water pressure (e.g., 35 psi), regardless of the current nozzle model or rinsing mode, the water flosser will immediately stop working to prevent continued operation in a state of severely insufficient performance or near-depleted power, avoiding motor overload, pump dry running, or damage to electronic components, thus ensuring the lifespan and safety of the water flosser.

[0038] It should be noted that the first and second preset voltages can be fixed, or values ​​set at the factory for the battery model when the water flosser is manufactured. Alternatively, the first and second preset voltages can be determined by identifying the battery's performance; this is not limited here.

[0039] Of course, the first preset water pressure is greater than the second preset water pressure, and the first preset voltage is greater than the second preset voltage. The specific values ​​of each are not limited here, but depend on the actual application requirements.

[0040] Optionally, the second preset water pressure can be determined based on the working mode or the model of the nozzle, or it can be a fixed protection threshold set, which is not limited here.

[0041] Therefore, this oral irrigator control method obtains the battery voltage and water pump motor operating current, and combines the model information of the currently installed nozzle with the flushing mode selected by the user to determine the first preset water pressure under the corresponding working conditions; determines the actual output water pressure based on the operating current, and increases the duty cycle of the water pump motor drive signal when the battery voltage and / or output water pressure are attenuating to compensate for the drop in output water pressure caused by the decrease in battery power, so as to maintain a stable and effective flushing intensity and maintain the stability of the oral irrigator.

[0042] In one embodiment, the nozzle has a first sensing identifier, and the housing is provided with an identification module that cooperates with the first sensing identifier.

[0043] In this embodiment, as Figure 2 As shown, step S200 may specifically include steps S210 and S220.

[0044] In step S210, when the nozzle is installed on the housing, the identification module reads the coding information carried by the first sensing identifier and parses the nozzle model information based on the coding information.

[0045] In step S220, based on the model information and the current rinsing mode of the water flosser, a target water pressure range corresponding to the model information and the current rinsing mode of the water flosser is retrieved from a preset lookup table, and the lower limit of the target water pressure range is used as the first preset water pressure.

[0046] Optionally, the water flosser is equipped with a mode selection module, such as a display screen, knob, or button. When the user operates the selection module, they can switch between multiple rinsing modes. The control device detects the change in the mode signal and then retrieves the corresponding first preset water pressure parameter from the memory.

[0047] In this embodiment, the nozzle is equipped with a first sensing identifier, which can be a non-contact or contact electronic identifier such as an RFID tag, magnetic code array, resistive identification chip, or optical identification code, used to uniquely identify the nozzle model. An identification module, such as a card reader, Hall sensor array, or photoelectric reading device, is integrated inside the housing at a corresponding location, capable of reading the coded information carried by the identifier when the nozzle is installed. By parsing the code, the system can accurately determine the specific type of nozzle currently installed, such as a standard nozzle, orthodontic nozzle, or periodontal pocket nozzle, and, combined with the user-selected rinsing mode, retrieve the matching target water pressure range from a pre-stored lookup table.

[0048] Understandably, this achieves intelligent adaptation between nozzle type and rinsing needs: different nozzles have significant impacts on the water pressure-flow relationship due to structural differences. If a fixed water pressure control is uniformly adopted, some nozzles may result in weak rinsing or excessive water flow. By automatically identifying the nozzle model and dynamically setting the first preset water pressure (i.e., the lower limit of the target water pressure range) in conjunction with the rinsing mode, cleaning efficiency can be maximized while ensuring safety. At the same time, this identification mechanism provides a precise benchmark reference for subsequent closed-loop adjustment based on actual water pressure (such as duty cycle adjustment in step S400), avoiding insufficient compensation or over-driving caused by misjudging the target water pressure, thereby improving energy efficiency, extending battery life, and enhancing the consistency and safety of the user experience.

[0049] In one embodiment, the water flosser includes a high-pulse mode and a low-pulse mode, and the nozzle type includes at least one of a standard nozzle, an orthodontic nozzle, and a periodontal pocket nozzle. The high-pulse mode refers to a high-pressure operating state for cleaning deep oral regions, which can be achieved by using a water pump motor operating at a higher speed to provide sufficient rinsing intensity to remove stubborn stains. The low-pulse mode refers to a low-pressure operating state for cleaning sensitive gingival areas, which can be achieved by using a water pump motor operating at a lower speed to avoid causing discomfort to sensitive tissues.

[0050] In this embodiment, step S220 involves retrieving a target water pressure range corresponding to the model information and the current rinsing mode of the water flosser from a preset lookup table based on the model information and the current rinsing mode of the water flosser, and using the lower limit of the target water pressure range as the first preset water pressure. Specifically, this may include steps S221 to S226.

[0051] In this embodiment, in step S221, when the nozzle is a standard nozzle and the current flushing mode is high pulse mode, the corresponding target water pressure range is retrieved as 60–90 psi, and 60 psi is used as the first preset water pressure.

[0052] In this embodiment, in step S222, when the nozzle is a standard nozzle and the current flushing mode is low pulse mode, the corresponding target water pressure range is retrieved as 40–60 psi, and 40 psi is used as the first preset water pressure.

[0053] In this embodiment, in step S223, when the nozzle is an orthogonal nozzle and the current rinsing mode is high pulse mode, the corresponding target water pressure range is selected as 50–80 psi, and 50 psi is used as the first preset water pressure.

[0054] In this embodiment, in step S224, when the nozzle is an orthogonal nozzle and the current flushing mode is low pulse mode, the corresponding target water pressure range is selected as 30–50 psi, and 30 psi is used as the first preset water pressure.

[0055] In this embodiment, in step S225, when the nozzle is a periodontal bag nozzle and the current flushing mode is high pulse mode, the corresponding target water pressure range is selected as 30–60 psi, and 30 psi is used as the first preset water pressure.

[0056] In this embodiment, in step S226, when the nozzle is a periodontal bag nozzle and the current flushing mode is low pulse mode, the corresponding target water pressure range is selected as 20–40 psi, and 20 psi is used as the first preset water pressure.

[0057] This embodiment combines the rinsing modes of the oral irrigator with the nozzle type to construct a target water pressure adaptation mechanism based on actual usage scenarios: the high-pulse mode provides strong rinsing force with a higher motor speed, suitable for removing deep or stubborn stains; the low-pulse mode outputs a gentle water flow with a lower speed, specifically designed for sensitive gum areas. After identifying the model of the currently installed nozzle, the system accurately retrieves the corresponding target water pressure range from a preset lookup table based on the user's selected rinsing mode, and uses its lower limit as the first preset water pressure. For example, the standard nozzle is set to 60 psi in high-pulse mode, while the periodontal pocket nozzle only requires 20 psi in low-pulse mode. In this way, the matching relationship between the fluid characteristics of different nozzles and clinical cleaning needs is fully considered, ensuring that just the right rinsing intensity is provided in various usage scenarios, avoiding discomfort caused by excessive water pressure, and preventing the cleaning effect from being affected by excessively low water pressure, thereby achieving personalized, safe and efficient oral care.

[0058] Of course, the type of nozzle and the rinsing mode of the water flosser can also include other types, which are not specifically limited here. Different preset water pressures can be set for different nozzle types and different rinsing modes.

[0059] Through the above solution, this application ensures that the water pressure control logic can immediately adapt to the water pressure requirements of the new mode after switching cleaning modes and nozzle models. This effectively prevents the normal water pressure state from being misjudged as abnormal, thus triggering unnecessary duty cycle adjustments or premature shutdown. As a result, the continuous stability of water pressure output is maintained, and the consistency of cleaning effect in different sensitive areas is improved.

[0060] In one embodiment, such as Figure 3 As shown, in step S300, when the battery voltage is less than the first preset voltage but greater than the second preset voltage, the duty cycle of the water pump motor drive signal is increased, which may specifically include steps S310 and S320.

[0061] In this embodiment, step S310 involves determining a first target duty cycle corresponding to the battery voltage based on a first difference between the battery voltage and the first preset voltage or a second difference between the battery voltage and the second preset voltage when the battery voltage is less than a first preset voltage and greater than a second preset voltage.

[0062] In this embodiment, step S320 involves increasing the duty cycle of the drive signal output to the water pump motor according to the first target duty cycle.

[0063] In this embodiment, the first target duty cycle is positively correlated with the first difference, or negatively correlated with the second difference. In this embodiment, the first target duty cycle and the first difference exhibit a non-linear positive correlation, or a non-linear negative correlation. Of course, in other embodiments, a linear positive or linear negative correlation may also be present; this is not limited here, as long as it ensures that the first target duty cycle increases as the battery voltage decreases within the corresponding range.

[0064] The first difference refers to the difference between the battery voltage and the first preset voltage, and the second difference refers to the difference between the battery voltage and the second preset voltage. Both differences can be implemented using a digital calculation unit or an analog differential circuit, with the aim of accurately quantifying the voltage drop. The first target duty cycle can be understood as the target duty cycle value of the water pump motor drive signal, which can be obtained through a lookup table or function calculation method, with the aim of dynamically setting the compensation amount based on the voltage state. Nonlinear positive correlation means that the first target duty cycle increases with the increase of the first difference, but the rate of change is not constant; nonlinear negative correlation means that the first target duty cycle increases with the decrease of the second difference, but the rate of change is not constant. These can be implemented using exponential functions, polynomial functions, etc., with the aim of adapting to the nonlinear response characteristics of the water pump motor system and avoiding abrupt compensation changes caused by linear relationships.

[0065] In one feasible implementation, by dynamically calculating a first target duty cycle based on the voltage difference when the battery voltage is between a first preset voltage and a second preset voltage, and adjusting the drive signal according to a nonlinear relationship, adaptive matching between the duty cycle and the voltage state is achieved. When the battery voltage is close to the first preset voltage, the first difference is small, and the increase in the first target duty cycle is small, preventing overcompensation from causing a sudden rise in water pressure; when the battery voltage is close to the second preset voltage, the second difference is small, and the increase in the first target duty cycle is large, ensuring sufficient compensation to maintain water pressure output. This nonlinear dynamic adjustment mechanism based on the difference closely links the duty cycle change with the degree of voltage attenuation, effectively smoothing the water pressure attenuation process and avoiding water pressure fluctuations caused by fixed increments or linear adjustments.

[0066] It can be explained that when the battery voltage drops from full charge (e.g., 4.2V) to 3.3V, the increase in duty cycle required to maintain the same water pressure tends to accelerate (e.g., 4.2V corresponds to a 90% duty cycle; 3.6V to 95%; 3.3V to 99%), exhibiting a convex function characteristic. That is, the lower the voltage, the greater the increase in duty cycle required per unit voltage drop. If linear compensation is used, in the low voltage region, even reaching 100% duty cycle may be insufficient to maintain water pressure, leading to control failure; nonlinearity can more smoothly approximate the physical limits.

[0067] Through the above solution, this application effectively avoids the problem of insufficient or excessive water pressure compensation, ensures the stability of the output water pressure in battery-powered mode, and thus improves the consistency of the oral irrigator's effect in the oral cleaning process.

[0068] In one embodiment, such as Figure 4 As shown, in step S400, when the output water pressure is less than the first preset water pressure but greater than the second preset water pressure, the duty cycle of the drive signal of the water pump motor is increased, which may specifically include steps S410 and S420.

[0069] In this embodiment, in step S410, when the output water pressure is less than the first preset water pressure but greater than the second preset water pressure, a second target duty cycle corresponding to the output water pressure is determined based on a third difference between the output water pressure and the first preset water pressure or a fourth difference between the output water pressure and the second preset water pressure.

[0070] In this embodiment, step S420 involves increasing the duty cycle of the drive signal output to the water pump motor according to the second target duty cycle.

[0071] The second target duty cycle is positively correlated with the third difference, or negatively correlated with the fourth difference. In this embodiment, the second target duty cycle exhibits a non-linear positive correlation with the third difference, or a non-linear negative correlation with the fourth difference. Of course, in other embodiments, a linear positive or linear negative correlation may also be present; this is not limited here, as long as it ensures that the second target duty cycle increases as the output water pressure decreases within the corresponding range.

[0072] The third difference refers to the numerical difference between the output water pressure and the first preset water pressure. This can be achieved using real-time calculated difference data, aiming to accurately quantify the degree to which the water pressure deviates from the first preset water pressure. The fourth difference refers to the numerical difference between the output water pressure and the second preset water pressure. This can also be achieved using real-time calculated difference data, aiming to accurately quantify the degree to which the water pressure deviates from the second preset water pressure. The second target duty cycle refers to the duty cycle setting value dynamically generated based on the water pressure difference. This can be achieved through calculation using a preset function or by looking up a table, aiming to provide an appropriate motor drive intensity based on the actual water pressure conditions. Nonlinear correlation refers to the nonlinear functional relationship between the second target duty cycle and the third or fourth difference. This can be achieved using exponential, logarithmic, or piecewise functions, aiming to match the nonlinear response characteristics of the pump system in different water pressure ranges.

[0073] When the output water pressure is between the first and second preset water pressures, the second target duty cycle is dynamically calculated based on the third or fourth difference. Since the second target duty cycle and the third difference are non-linearly positively correlated, when the water pressure approaches the first preset water pressure (the absolute value of the third difference is less than the absolute value of the fourth difference), the increase in the target duty cycle decreases accordingly, avoiding over-adjustment caused by small water pressure fluctuations. Conversely, since the second target duty cycle and the fourth difference are non-linearly negatively correlated, when the water pressure approaches the second preset water pressure (the absolute value of the fourth difference is less than the absolute value of the third difference), the target duty cycle increases significantly, ensuring a rapid increase in water pressure under critical conditions. By adjusting the drive signal according to the determined second target duty cycle, the system achieves precise matching between the degree of water pressure deviation and the duty cycle adjustment amplitude, dynamically optimizing the drive strength of the water pump motor according to the water pressure state and effectively suppressing water pressure fluctuations.

[0074] In one feasible implementation, in the control module of the water flosser, when the output water pressure is detected to be less than the first preset water pressure and greater than the second preset water pressure, the microcontroller calculates the third difference between the output water pressure and the first preset water pressure in real time, and determines the second target duty cycle according to a preset nonlinear function (such as an exponential function); subsequently, the microcontroller adjusts the duty cycle of the PWM signal to the target value, thereby increasing the driving strength of the water pump motor.

[0075] In a water flosser, the relationship between output water pressure and motor speed is not linear. The output water pressure is roughly proportional to the square of the flow rate, while the flow rate is nonlinearly related to the motor speed. Furthermore, the motor's efficiency decreases under low voltage or high load conditions, and changes in back electromotive force further exacerbate the nonlinearity between input power and output water pressure. Therefore, if linear compensation is used, it can easily lead to over-compensation (overshooting, strong impact) when the water pressure deviation is small, while insufficient compensation (slow response, weak rinsing) when the deviation is large.

[0076] The above solution can dynamically adjust the duty cycle according to the degree of water pressure deviation, avoiding the oscillation risk caused by fixed increments, maintaining a stable flushing intensity when the battery voltage fluctuates or the external resistance changes, extending the effective working time of a single charge and improving the user experience.

[0077] In one embodiment, such as Figure 5 As shown, the oral irrigator control method further includes steps S610 and S620.

[0078] In this embodiment, in step S610, when the battery voltage is less than the first preset voltage and greater than the second preset voltage, and the output water pressure is less than the first preset water pressure and greater than the second preset water pressure, a second target duty cycle corresponding to the output water pressure is determined based on a third difference between the output water pressure and the first preset water pressure or a fourth difference between the output water pressure and the second preset water pressure.

[0079] In this embodiment, step S620 involves increasing the duty cycle of the drive signal output to the water pump motor according to the second target duty cycle.

[0080] The second target duty cycle is positively correlated with the third difference, or negatively correlated with the fourth difference. In this embodiment, the second target duty cycle exhibits a non-linear positive correlation with the third difference, or a non-linear negative correlation with the fourth difference. Of course, in other embodiments, a linear positive or linear negative correlation may also be present; this is not limited here, as long as it ensures that the second target duty cycle increases as the output water pressure decreases within the corresponding range.

[0081] This application's solution determines the target duty cycle independently based solely on the deviation of the output water pressure when both battery voltage and output water pressure are within the intermediate range, thus avoiding the superposition effect of voltage and water pressure adjustment strategies. When the system detects that the battery voltage is between the first and second preset voltages and the output water pressure is between the first and second preset water pressures, it directly calculates the second target duty cycle based on the third or fourth difference, ensuring that the duty cycle adjustment is fully focused on the actual water pressure requirement. The positive correlation between the second target duty cycle and the third difference ensures a smooth adjustment when the water pressure approaches the upper threshold to prevent sudden increases in water pressure; while the negative correlation with the fourth difference triggers a significant increase in duty cycle when the water pressure approaches the lower threshold, quickly compensating for water pressure attenuation. Through this solution, the conflict in duty cycle adjustment when both battery voltage and output water pressure are within the intermediate range is effectively eliminated, achieving precise coordination of water pressure control. This ensures that a stable flushing intensity is maintained even under the combined effects of decreased battery power supply and changes in external resistance, avoiding water pressure fluctuations or response lag caused by over-adjustment.

[0082] Understandably, output water pressure is a direct indicator of the user's actual experience and rinsing effect, while battery voltage is only an indirect factor affecting water pressure. By prioritizing the response to water pressure feedback to adjust the duty cycle, the target rinsing performance can be maintained more precisely, avoiding overdrive or water pressure overshoot caused by simply compensating for voltage, thus improving the working stability of the oral irrigator.

[0083] In one embodiment, such as Figure 6 As shown, step S100 involves obtaining the operating current of the water pump motor of the oral irrigator and determining the output water pressure of the oral irrigator based on the operating current. Specifically, this may include steps S110 and S120.

[0084] In this embodiment, step S110 involves obtaining the operating current of the water pump motor of the oral irrigator.

[0085] In this embodiment, step S120 involves converting the working current into the corresponding output water pressure based on a preset first lookup table.

[0086] The operating current is positively correlated with the output water pressure.

[0087] The acquisition of the operating current of the water pump motor in the water flosser refers to the real-time capture of the motor's electrical parameters during operation. This can be achieved using measuring elements such as Hall effect sensors, current transformers, or isolated current detection chips. The purpose is to avoid additional interference to the motor's power supply circuit while ensuring high-precision acquisition of the current signal. The preset first lookup table refers to a pre-established database mapping the operating current to the output water pressure. This can be implemented using a multi-dimensional lookup table stored in the non-volatile memory of the embedded system. The positive correlation between operating current and output water pressure reflects the physical law that the current value increases synchronously with the increase in motor load. This aligns with the fundamental principle in fluid mechanics that increased resistance leads to increased motor torque demand. Its purpose is to provide clear logical constraints for the construction of the lookup table and avoid directional ambiguity during the conversion process.

[0088] The above embodiments can be used when the water flosser is operating normally, without nozzle or flow channel blockage. Under this condition, the water flow resistance is mainly determined by the set setting and water supply characteristics. There is a stable and repeatable correspondence between the motor current and the output water pressure. Therefore, the actual water pressure can be accurately calculated by using a preset first lookup table, and duty cycle compensation can be performed accordingly to effectively maintain the consistency of rinsing performance. However, when the water flosser is blocked (such as when the nozzle is blocked by foreign objects or the inlet filter is blocked), the water flow channel is obstructed, and the pressure in the pump chamber rises abnormally, but the actual output water pressure drops or even approaches zero. At this time, although the motor's operating current increases significantly due to the surge in load, this current can no longer accurately reflect the effective output water pressure through the original lookup table. If the duty cycle is increased according to the conventional logic, it will lead to motor overload, increased temperature rise, and even damage to the pump body or battery. Therefore, in one embodiment, when an abnormal increase in operating current is detected, it is determined to be a blockage fault, and the step of increasing the duty cycle of the drive signal is not executed.

[0089] In one embodiment, such as Figure 7 As shown, the power supply circuit of the water pump motor of the oral irrigator has a current sampling module. Step S110 obtains the operating current of the water pump motor of the oral irrigator, which may specifically include steps S111 to S113.

[0090] In this embodiment, step S111 involves collecting the power supply current of the water pump motor through the current sampling module.

[0091] In this embodiment, step S112 involves filtering and / or converting the power supply current to an analog-to-digital converter to obtain the operating current value.

[0092] In this embodiment, step S113 involves using the operating current value as the operating current of the water pump motor.

[0093] The current sampling module refers to the hardware component installed in the power supply circuit for direct current detection. It can be implemented using a Hall effect sensor or a shunt resistor, aiming to avoid the inherent errors of indirect parameter inference and ensure the authenticity and real-time nature of the data source. The current sampling module can be understood as the specific execution unit of the current sampling module, which may include a signal conditioning circuit or a dedicated current detection chip. Its purpose is to capture the raw current signal in real time and avoid the risk of signal distortion caused by circuit fluctuations. Filtering and analog-to-digital conversion refer to noise suppression and digital processing of the acquired signal. This can be achieved by using a low-pass filter in conjunction with an analog-to-digital converter. Its purpose is to specifically suppress high-frequency noise and transient interference, while converting the analog signal into a digital signal suitable for the control system, thereby improving the purity and processability of the signal.

[0094] This embodiment directly captures the power supply current of the water pump motor by integrating a current sampling module into the power supply circuit. Then, a filtering stage effectively eliminates circuit noise and external interference. The analog signal is then stably converted into a digital signal via analog-to-digital conversion. Finally, the processed operating current value is used as input to determine the output water pressure, thus forming a complete current measurement link. Because the coordinated processing of filtering and analog-to-digital conversion ensures the stability and resolution of the operating current value, this link provides a reliable data foundation for water pressure determination based on the operating current, enabling the control strategy to accurately respond to actual water pressure changes.

[0095] Optionally, the current sampling module can be specifically a current detection circuit consisting of a shunt resistor and an operational amplifier; the filtering process can use a low-pass filter composed of resistors and capacitors to suppress high-frequency noise; and the analog-to-digital conversion uses the microcontroller's built-in analog-to-digital converter to convert the filtered analog signal into a digital value.

[0096] This application also provides a method for controlling a water flosser, in one embodiment, such as... Figure 8 As shown, the oral irrigator control method includes steps S910 to S940.

[0097] In this embodiment, the water flosser includes a housing, a battery, a nozzle, a water pump, and a water pump motor. The nozzle is disposed in the housing and can be detached from the housing. The water pump and water pump motor are disposed inside the housing. The water pump motor is connected to the water pump drive. The battery is disposed in the housing and is used to power the water flosser. The water inlet of the water pump is used to connect to a water source, and the water outlet of the water pump is connected to the nozzle.

[0098] In this embodiment, step S910 involves obtaining the operating current of the water pump motor of the water flosser when the water flosser is operating in battery-powered mode, and determining the output water pressure of the water flosser based on the operating current.

[0099] In this embodiment, step S920 involves obtaining the model information of the nozzle installed on the housing, and determining the first preset water pressure corresponding to the current state based on the model information and the rinsing mode of the water flosser.

[0100] In this embodiment, step S930 involves increasing the duty cycle of the pump motor drive signal when the output water pressure is less than the first preset water pressure but greater than the second preset water pressure.

[0101] In this embodiment, step S940 involves controlling the oral irrigator to stop working when the output water pressure is not greater than the second preset water pressure.

[0102] The reason why this embodiment does not need to directly monitor the battery voltage is because it adopts a closed-loop strategy with the actual output water pressure as the final control target. Regardless of the battery level, as long as the motor can still drive the water pump to generate effective water flow, its operating current will accurately reflect the current load status, and the actual output water pressure can be accurately deduced through the pre-calibrated current-water pressure mapping relationship.

[0103] When the water flosser operates in battery-powered mode, it obtains the operating current of the water pump motor and accurately calculates the current actual output water pressure based on a pre-calibrated current-water pressure mapping relationship. At the same time, by identifying the model information of the detachable nozzle and combining it with the user-selected rinsing mode, it dynamically determines the first preset water pressure that matches the current usage scenario, which is the minimum effective water pressure benchmark that needs to be maintained under this condition. When the actual output water pressure is detected to be lower than this benchmark but has not yet fallen to the failure threshold (i.e., higher than the second preset water pressure), the duty cycle of the water pump motor drive signal is increased to enhance the driving capability and compensate for the water pressure attenuation caused by the decrease in battery power. Once the output water pressure drops below the second preset water pressure, the machine is immediately stopped to prevent ineffective spraying or equipment damage.

[0104] The above embodiments can be used when the water flosser is operating normally, without nozzle or flow channel blockage. Under this condition, the water flow resistance is mainly determined by the set setting and water supply characteristics. There is a stable and repeatable correspondence between the motor current and the output water pressure. Therefore, the actual water pressure can be accurately calculated by using a preset first lookup table, and duty cycle compensation can be performed accordingly to effectively maintain the consistency of rinsing performance. However, when the water flosser is blocked (such as when the nozzle is blocked by foreign objects or the inlet filter is blocked), the water flow channel is obstructed, and the pressure in the pump chamber rises abnormally, but the actual output water pressure drops or even approaches zero. At this time, although the motor's operating current increases significantly due to the surge in load, this current can no longer accurately reflect the effective output water pressure through the original lookup table. If the duty cycle is increased according to the conventional logic, it will lead to motor overload, increased temperature rise, and even damage to the pump body or battery. Therefore, in one embodiment, when an abnormal increase in operating current is detected, it is determined to be a blockage fault, and the step of increasing the duty cycle of the drive signal is not executed.

[0105] This application also provides a control device configured to implement the oral irrigator control method as described above.

[0106] It should be noted that since the control device can implement the vehicle control methods described in all the embodiments above, the control device has at least all the beneficial effects that the vehicle control methods described above can bring, which will not be repeated here.

[0107] This application also provides a dental flosser, which includes a removable battery and a control device as described above.

[0108] It should be noted that since the vehicle includes the aforementioned control device, which can implement the vehicle control method described in all the embodiments above, the vehicle has at least all the beneficial effects that the vehicle control method and control device described above can bring, which will not be repeated here.

[0109] To address the issues of unstable water pressure and premature shutdown caused by voltage drops in traditional water flossers during battery operation, this invention combines a technology that determines the output water pressure based on the pump motor's operating current with a dynamic adjustment mechanism that uses dual thresholds for both battery voltage and output water pressure. This overcomes the limitations of relying solely on voltage monitoring, which cannot accurately reflect the actual water pressure status. It achieves precise compensation for water pressure during battery voltage drops, avoids premature shutdown caused by a single voltage threshold trigger, effectively extends the effective working time per charge, and maintains the stability of the rinsing intensity.

[0110] In this embodiment, the water flosser includes a housing, a battery, a nozzle, a water pump, and a water pump motor. The nozzle is disposed in the housing and can be detached from the housing. The water pump and water pump motor are disposed inside the housing. The water pump motor is connected to the water pump drive. The battery is disposed in the housing and is used to power the water flosser. The water inlet of the water pump is used to connect to a water source, and the water outlet of the water pump is connected to the nozzle.

[0111] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not 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 or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no technical conflict, the various technical features mentioned in the various embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A method of controlling a waterpik, the method comprising: The oral irrigator comprises a casing, a battery, a nozzle, a water pump and a water pump motor, the nozzle is arranged on the casing and can be detached from the casing, the water pump and the water pump motor are arranged in the casing, the water pump motor is in driving connection with the water pump, the battery is arranged in the casing and is used for supplying power to the oral irrigator, a water inlet end of the water pump is used for connecting to a water source, and a water outlet end of the water pump is connected to the nozzle; the oral irrigator control method comprises: When the oral irrigator is working and is powered by the battery, the battery voltage of the oral irrigator is acquired, the working current of the water pump motor of the oral irrigator is acquired, and the output water pressure of the oral irrigator is determined based on the working current; The model information of the nozzle installed on the casing is acquired, and based on the model information and the working irrigation mode of the oral irrigator, a first preset water pressure corresponding to the current state is determined, wherein the first preset water pressure represents the highest water pressure reference in a target water pressure interval corresponding to the current model information and the working irrigation mode; When the battery voltage is less than a first preset voltage and greater than a second preset voltage, the duty cycle of the driving signal of the water pump motor is increased; When the output water pressure is less than the first preset water pressure and greater than the second preset water pressure, the duty cycle of the driving signal of the water pump motor is increased; When the battery voltage is not greater than the second preset voltage and / or the output water pressure is not greater than the second preset water pressure, the oral irrigator is controlled to stop working.

2. The oral irrigator control method of claim 1, wherein, The nozzle has a first sensing identifier, and the casing is provided with an identification module matched with the first sensing identifier; the acquisition of the model information of the nozzle installed on the casing and the determination of the first preset water pressure corresponding to the current state based on the model information and the working irrigation mode of the oral irrigator comprise: When the nozzle is installed on the casing, the code information carried by the first sensing identifier is read by the identification module, and the model information of the nozzle is parsed based on the code information; According to the model information and the current irrigation mode of the oral irrigator, a target water pressure interval corresponding to the model information and the current irrigation mode of the oral irrigator is called from a preset comparison table, and the lower limit value of the target water pressure interval is taken as the first preset water pressure.

3. The oral irrigator control method of claim 2, wherein, The irrigation mode of the oral irrigator comprises a high pulse mode and a low pulse mode, and the nozzle model comprises at least one of a standard nozzle, an orthodontic nozzle and a periodontal pocket nozzle; the calling of the target water pressure interval corresponding to the model information and the current irrigation mode of the oral irrigator from the preset comparison table according to the model information and the current irrigation mode of the oral irrigator, and the taking of the lower limit value of the target water pressure interval as the first preset water pressure comprise: When the nozzle is a standard nozzle and the current irrigation mode is a high pulse mode, the corresponding target water pressure interval is 60-90 psi, and 60 psi is taken as the first preset water pressure; and / or, When the nozzle is a standard nozzle and the current irrigation mode is a low pulse mode, the corresponding target water pressure interval is 40-60 psi, and 40 psi is taken as the first preset water pressure; and / or, when the jet head is an orthodontic jet head and the current irrigation mode is a high pulse mode, a corresponding target water pressure interval of 50-80 psi is called, and 50 psi is taken as the first preset water pressure; and / or, when the jet head is an orthodontic jet head and the current irrigation mode is a low pulse mode, a corresponding target water pressure interval of 30-50 psi is called, and 30 psi is taken as the first preset water pressure; and / or, when the jet head is a periodontal pocket jet head and the current irrigation mode is a high pulse mode, a corresponding target water pressure interval of 30-60 psi is called, and 30 psi is taken as the first preset water pressure; and / or, when the jet head is a periodontal pocket jet head and the current irrigation mode is a low pulse mode, a corresponding target water pressure interval of 20-40 psi is called, and 20 psi is taken as the first preset water pressure.

4. The oral irrigator control method of any one of claims 1 to 3, wherein, The increasing the duty cycle of the driving signal of the water pump motor in the case that the battery voltage is less than the first preset voltage and greater than the second preset voltage includes: determining a first target duty cycle corresponding to the battery voltage based on a first difference between the battery voltage and the first preset voltage or a second difference between the battery voltage and the second preset voltage in the case that the battery voltage is less than the first preset voltage and greater than the second preset voltage; increasing the duty cycle of the driving signal output to the water pump motor according to the first target duty cycle; wherein the first target duty cycle is positively correlated with the first difference, or the first target duty cycle is negatively correlated with the second difference.

5. The oral irrigator control method of any one of claims 1 to 3, wherein, The increasing the duty cycle of the driving signal of the water pump motor in the case that the output water pressure is less than the first preset water pressure and greater than the second preset water pressure includes: determining a second target duty cycle corresponding to the output water pressure based on a third difference between the output water pressure and the first preset water pressure or a fourth difference between the output water pressure and the second preset water pressure in the case that the output water pressure is less than the first preset water pressure and greater than the second preset water pressure; increasing the duty cycle of the driving signal output to the water pump motor according to the second target duty cycle; wherein the second target duty cycle is positively correlated with the third difference, or the second target duty cycle is negatively correlated with the fourth difference.

6. The oral irrigator control method of any one of claims 1 to 3, wherein, The oral irrigator control method further includes: determining a second target duty cycle corresponding to the output water pressure based on a third difference between the output water pressure and the first preset water pressure or a fourth difference between the output water pressure and the second preset water pressure in the case that the battery voltage is less than the first preset voltage and greater than the second preset voltage, and the output water pressure is less than the first preset water pressure and greater than the second preset water pressure; increasing the duty cycle of the driving signal output to the water pump motor according to the second target duty cycle; wherein the second target duty cycle is positively correlated with the third difference, or the second target duty cycle is negatively correlated with the fourth difference.

7. The oral irrigator control method of any one of claims 1 to 3, wherein, The oral irrigator has a current sampling module in the power supply circuit of the water pump motor, and the obtaining the working current of the water pump motor of the oral irrigator and determining the output water pressure of the oral irrigator based on the working current includes: The current sampling module is used to collect the power supply current of the water pump motor; The power supply current is filtered and / or analog-to-digital converted to obtain a working current value; The working current value is used as the working current of the water pump motor; The working current is converted into a corresponding output water pressure based on a preset first comparison table, wherein the working current and the output water pressure are positively correlated.

8. A method of controlling a waterpik, the method comprising: The oral irrigator comprises a housing, a battery, a nozzle, a water pump and a water pump motor, the nozzle is arranged on the housing and can be detached from the housing, the water pump and the water pump motor are arranged in the housing, the water pump motor is drivingly connected with the water pump, the battery is arranged in the housing and is used to supply power to the oral irrigator, a water inlet end of the water pump is used to access a water source, a water outlet end of the water pump is connected with the nozzle; the oral irrigator control method comprises: When the oral irrigator works in a battery power supply mode, the working current of the water pump motor of the oral irrigator is obtained, and the output water pressure of the oral irrigator is determined based on the working current; The model information of the nozzle installed on the housing is obtained, and based on the model information and the working irrigation mode of the oral irrigator, a first preset water pressure corresponding to the current state is determined, wherein the first preset water pressure represents the highest water pressure reference in a target water pressure interval corresponding to the current model information and the working irrigation mode; When the output water pressure is less than the first preset water pressure and greater than a second preset water pressure, the duty cycle of the driving signal of the water pump motor is increased; When the output water pressure is not greater than the second preset water pressure, the oral irrigator is controlled to stop working.

9. A control device characterized by comprising: The control device is configured to implement the oral irrigator control method of any one of claims 1 to 7, or the oral irrigator control method of claim 8.

10. An oral irrigator characterized by, The oral irrigator comprises a detachable battery and the control device of claim 9. The oral irrigator comprises a detachable battery and the control device of claim 9.

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