Essential oil atomization control system and method based on intelligent hair removal instrument

Abstract

The invention discloses an essential oil atomization control system and method based on an intelligent depilation instrument, and relates to the technical field of intelligent control of depilation instruments, the essential oil atomization control system comprises a data acquisition module, a slope calculation module, a threshold judgment module, a frequency modulation control module and an opening adjustment module; the method comprises the following steps: acquiring time sequence data of atomization air pressure, essential oil flow and skin surface temperature of an unhairing instrument, and performing phase-locked phase-sensitive detection demodulation on the atomization air pressure and the essential oil flow to obtain a mutual angle of position between the atomization air pressure and the essential oil flow; according to the method, time sequence data of the atomization air pressure, the essential oil flow and the skin surface temperature of the hair removal instrument are collected according to a fixed sampling period, phase-locked phase sensitive detection demodulation is carried out on the atomization air pressure and the essential oil flow to obtain a mutual position angle, and the phase incidence relation between the skin temperature and the atomization air pressure and the phase incidence relation between the skin temperature and the essential oil flow are successfully quantified; and core phase parameters are provided for subsequent accurate control.

Description

Technical Field

[0001] This invention relates to the field of intelligent control technology for hair removal instruments, and in particular to an essential oil atomization control system and method for intelligent hair removal instruments. Background Technology

[0002] Hair removal devices are widely used in personal care, beauty, and body treatments. Their core function is to remove body hair through physical or optical methods. To enhance the user experience and skin protection, they are often equipped with an essential oil atomization function, delivering atomized essential oils to the skin surface to achieve auxiliary effects such as moisturizing, soothing, and repairing. These applications require a high degree of adaptability to the essential oil atomization process, necessitating dynamic adjustment of atomization parameters based on skin temperature changes to avoid excessive atomization leading to oily skin or insufficient atomization causing dryness and stinging.

[0003] During the operation of a hair removal device, the skin surface temperature undergoes dynamic changes due to factors such as differences in skin condition, fluctuations in ambient temperature, and variations in hair removal energy output. This disrupts the original stable phase correlation between atomized air pressure and essential oil flow rate, creating a temperature-triggered atomization jump zone. At this point, the absolute value of the rate of change of the relative angle with temperature increases significantly, and the system's sensitivity to temperature disturbances increases dramatically. If not controlled in time, the essential oil atomization volume will rapidly deviate from the suitable range, thus affecting the hair removal experience and skin protection effect.

[0004] Existing technologies mostly employ atomization control methods based on fixed parameters or simple temperature deviation feedback adjustment, failing to quantify the relationship between temperature and mutual azimuth angle changes, and unable to identify states where the temperature's influence on mutual azimuth angle suddenly increases. When the system enters this state, the abrupt change in mutual azimuth angle causes nonlinear fluctuations in atomization volume. Traditional control methods still adjust parameters using fixed coefficients or simple proportions, leading to problems such as decreased atomization adaptability and increased risk of skin irritation due to insufficient or excessive adjustment. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies, such as the lack of quantification of the correlation between temperature and mutual angular changes, the inability to identify atomization transition zones, and the resulting misalignment leading to unstable essential oil atomization and a decline in user experience. Therefore, this invention proposes an essential oil atomization control system and method based on an intelligent hair removal device.

[0006] To address the problems existing in the prior art, the present invention adopts the following technical solution: An essential oil atomization control system for an intelligent hair removal instrument includes a data acquisition module, a slope calculation module, a threshold determination module, a frequency modulation control module, and an opening adjustment module.

[0007] Preferably, the process involves collecting time-series data on the atomized air pressure, essential oil flow rate, and skin surface temperature of the hair removal device, and performing phase-locked loop (PLL) phase-sensitive detection demodulation on the atomized air pressure and essential oil flow rate to obtain their relative positions. This includes: collecting time-series data on the atomized air pressure, essential oil flow rate, and skin surface temperature of the hair removal device at a fixed sampling period; multiplying the product signal of the atomized air pressure and essential oil flow rate by the cosine and sine terms corresponding to the atomization drive angular frequency of the hair removal device, respectively, to obtain cosine product signals and sine product signals; performing PLL phase-sensitive detection demodulation on the cosine product signals and sine product signals within a set PLL integration window to obtain the discrete integral values ​​of the in-phase and quadrature components; and calculating the discrete integral values ​​of the in-phase and quadrature components using the arctangent function to obtain the relative positions of the atomized air pressure and essential oil flow rate.

[0008] Preferably, the calculation of the temperature-sensitive response slope based on the mutual angular change and the skin surface temperature change includes: traversing the sampling period sequence in reverse chronological order, selecting the first sampling period that satisfies the condition that the absolute value of the skin surface temperature difference with the current sampling period is not less than a preset temperature threshold; setting the mutual angular change of the previous sampling period as the baseline phase; using the skin surface temperature difference and mutual angular change difference between the current sampling period and the selected sampling period as the skin surface temperature change and mutual angular change, respectively; and obtaining the current temperature-sensitive response slope based on the ratio of the mutual angular change to the skin surface temperature change.

[0009] Preferably, the minimum significant response threshold is calculated based on the phase resolution and temperature resolution of the hair removal instrument sensor, including: reading the phase resolution and temperature resolution of the hair removal instrument sensor; and using the ratio of the phase resolution to the temperature resolution as the minimum significant response threshold.

[0010] Preferably, the temperature-sensitive response slope and the minimum significant response threshold are analyzed to obtain the temperature-controlled atomization transition zone state, including: determining whether the current temperature-sensitive response slope is not less than the minimum significant response threshold to obtain a first determination result; determining whether the sign of the current temperature-sensitive response slope is consistent with that of the temperature-sensitive response slope in the previous sampling period to obtain a second determination result; if the first determination result is that the current temperature-sensitive response slope is not less than the minimum significant response threshold, and the second determination result is that the sign has changed, then it is determined that the temperature-controlled atomization transition zone state has been entered; otherwise, it is determined that the temperature-controlled atomization transition zone state has not been entered.

[0011] Preferably, the atomization driving angular frequency of the hair removal instrument is tuned according to the temperature-controlled atomization transition zone state to obtain an updated atomization driving angular frequency, including: if the temperature-controlled atomization transition zone state has not been entered, the current atomization driving angular frequency is directly used as the updated atomization driving angular frequency; if the temperature-controlled atomization transition zone state has been entered, the adjustment frequency is obtained according to the minimum step value of the atomization driving angular frequency; the temperature-sensitive response slope of the hair removal instrument at the adjusted frequency is calculated; the current temperature-sensitive response slope is compared with the temperature-sensitive response slope corresponding to the adjusted frequency, and the atomization driving angular frequency is updated in the direction of reducing the absolute value of the current temperature-sensitive response slope.

[0012] Preferably, adjusting the essential oil delivery opening of the hair removal device based on the updated atomization drive angular frequency includes: obtaining the adjustment opening based on the minimum step value of the essential oil delivery opening of the hair removal device at the updated atomization drive angular frequency; calculating the mutual angle between the atomization pressure and the essential oil flow rate of the hair removal device at the adjusted opening; comparing the mutual angle corresponding to the adjusted opening with the baseline phase, and updating the essential oil delivery opening in the direction of reducing the absolute value of the difference between the mutual angle and the baseline phase.

[0013] To address the aforementioned problems, this invention also provides a method for controlling the atomization of essential oils in an intelligent hair removal device. The method includes: S1, collecting time-series data of the atomization pressure, essential oil flow rate, and skin surface temperature of the hair removal device; performing phase-locked loop (PLL) demodulation on the atomization pressure and essential oil flow rate to obtain their relative positions; S2, calculating the temperature-sensitive response slope based on the change in relative positions and the change in skin surface temperature; S3, calculating the minimum significant response threshold based on the phase resolution and temperature resolution of the hair removal device's sensors; and performing a judgment analysis on the temperature-sensitive response slope and the minimum significant response threshold to obtain the temperature-controlled atomization transition zone state; S4, adjusting the atomization driving angular frequency of the hair removal device according to the temperature-controlled atomization transition zone state to obtain an updated atomization driving angular frequency; and S5, adjusting the essential oil delivery opening of the hair removal device based on the updated atomization driving angular frequency.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention collects time-series data of atomized air pressure, essential oil flow rate, and skin surface temperature from a hair removal instrument at a fixed sampling period, and performs phase-locked phase-sensitive detection demodulation on the atomized air pressure and essential oil flow rate to obtain their relative positions. This successfully quantifies the phase correlation between skin temperature, atomized air pressure, and essential oil flow rate, providing core phase parameters for subsequent precise control. It avoids blind control caused by a lack of phase quantification basis and solves the problem of precise atomization control based on phase correlation from the basic data level.

[0015] 2. This invention calculates the temperature-sensitive response slope by measuring the change in mutual angular position and the change in skin surface temperature. At the same time, it determines the minimum significant response threshold based on the phase resolution and temperature resolution of the hair removal instrument sensor. By comparing the temperature-sensitive response slope with this threshold and analyzing the sign of the temperature-sensitive response slope, it achieves accurate identification of the temperature-controlled atomization transition zone. This avoids the situation where the atomization volume deviation increases and the skin becomes uncomfortable after the system enters a state where the temperature affects the mutual angular position suddenly.

[0016] 3. This invention adjusts the atomization drive angular frequency of the hair removal instrument by controlling the temperature-controlled atomization transition zone state, and adjusts the essential oil delivery opening by the minimum step value based on the updated atomization drive angular frequency, forming a dynamically adapted closed-loop control logic. This effectively solves the problem of atomization instability caused by insufficient or excessive adjustment, and improves the adaptability of essential oil atomization to skin condition and the safety of use. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 A functional block diagram of an essential oil atomization control system for an intelligent hair removal instrument provided in an embodiment of the present invention; Figure 2 This is a flowchart illustrating an essential oil atomization control method for an intelligent hair removal instrument according to an embodiment of the present invention. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0019] Example: This example provides an essential oil atomization control system based on an intelligent hair removal device. See [link to example]. Figure 1 Specifically, it includes: a data acquisition module, used to collect time series data of the atomized air pressure, essential oil flow rate and skin surface temperature of the hair removal instrument, and to perform phase-locked phase-sensitive detection demodulation on the atomized air pressure and essential oil flow rate to obtain the mutual position angle of the atomized air pressure and essential oil flow rate; In an embodiment of the present invention, time-series data of the atomized air pressure, essential oil flow rate and skin surface temperature of the hair removal instrument are collected, and phase-locked phase-sensitive detection demodulation is performed on the atomized air pressure and essential oil flow rate to obtain the mutual azimuth angle between the atomized air pressure and essential oil flow rate. This includes: collecting time-series data of the atomized air pressure, essential oil flow rate and skin surface temperature of the hair removal instrument at a fixed sampling period. The product signal of atomized air pressure and essential oil flow rate is multiplied by the cosine and sine terms corresponding to the atomization drive angular frequency of the hair removal instrument, respectively, to obtain the cosine product signal and the sine product signal. Specifically, the atomizing air pressure of a hair removal device refers to the gas pressure used to drive the atomization of essential oils. Its magnitude directly affects the fineness of the atomized particles and the spray distance. High pressure corresponds to fine particles sprayed over short distances, while low pressure corresponds to coarse particles sprayed over long distances. The essential oil flow rate refers to the volume of essential oil delivered to the atomizing device per unit time. Its magnitude determines the amount of atomization and needs to be matched with the skin's needs to avoid waste or insufficiency. The skin surface temperature is the real-time temperature state of the skin in the hair removal area and is a key indicator reflecting the skin's tolerance and needs. Its changes are closely related to the atomizing air pressure and essential oil flow rate.

[0020] Specifically, a fixed sampling period is first set, which is determined based on the operating characteristics and control precision requirements of the hair removal instrument. A pressure sensor, an essential oil pipeline flow sensor, and a contact temperature sensor installed at the atomization outlet of the hair removal instrument are used to synchronously collect atomization pressure, essential oil flow, and skin surface temperature, respectively. After converting the detection signals of each sensor into digital signals, they are stored sequentially according to the sampling period to form atomization pressure time series data, essential oil flow time series data, and skin surface temperature time series data, so as to ensure the consistency of data collection time.

[0021] Specifically, the pressure value at a specific sampling moment is extracted from the atomized pressure time series data, and the flow rate value at the same sampling moment is extracted from the essential oil flow rate time series data. The product of the two is calculated to obtain the product signal of the atomized pressure and essential oil flow rate at that sampling moment. The atomization drive angular frequency of the hair removal instrument at the same moment is obtained. Based on the drive angular frequency and the corresponding sampling moment, the cosine and sine terms corresponding to the drive angular frequency at that moment are calculated. The product signal is multiplied by the cosine and sine terms at the same moment, respectively, to obtain a continuous cosine product signal sequence and a sine product signal sequence, thus achieving preliminary separation of the fundamental frequency component related to the system drive frequency in the product signal.

[0022] Within the set phase-locked integration window, the cosine product signal and the sine product signal are demodulated by phase-locked phase-sensitive detection to obtain the discrete integral values ​​of the in-phase component and the quadrature component. The discrete integral values ​​of the in-phase and quadrature components are calculated by using the arctangent function to obtain the mutual azimuth angle between the atomizing pressure and the essential oil flow rate. Specifically, based on the noise suppression requirements and signal response speed requirements of the hair removal instrument system, the duration of the phase-locked integration window is set. For example, for conventional home hair removal instruments, the duration of the phase-locked integration window is set to 3 signal cycles. This effectively suppresses high-frequency noise through multi-cycle superposition and ensures that the phase measurement can reflect skin temperature fluctuations in a timely manner.

[0023] The phase-locked integration window length is the ratio of the phase-locked integration window duration to the fixed sampling period, and must cover at least one signal period corresponding to the driving angular frequency. For each phase-locked integration window, the cosine product signal and the sine product signal are accumulated separately. The accumulated value is multiplied by 2 and the ratio of the window length to obtain the discrete integral values ​​of the in-phase component and the quadrature component, respectively, thereby improving the signal-to-noise ratio.

[0024] Specifically, the discrete integral value of the in-phase component is used as the real part input of the arctangent function, and the discrete integral value of the quadrature component is used as the imaginary part input. The four-quadrant arctangent function is called for calculation, and the calculation result is mapped to the phase value range of 0 to 2π to obtain the mutual position angle between the atomizing gas pressure and the essential oil flow rate in the current phase-locked integration window. This mutual position angle can truly reflect the phase correlation between the two, providing core parameters for subsequent precise control.

[0025] The slope calculation module is used to calculate the temperature-sensitive response slope based on the change in mutual azimuth angle and the change in skin surface temperature. In an embodiment of the present invention, the temperature-sensitive response slope is calculated based on the mutual angular change and the skin surface temperature change, including: traversing the sampling period sequence in reverse time order and selecting the first sampling period that satisfies that the absolute value of the skin surface temperature difference with the current sampling period is not less than a preset temperature threshold. Set the relative position angle of the previous sampling period as the baseline phase; Specifically, the skin surface temperature value corresponding to the current sampling period is extracted. Starting from the previous sampling period, the historical sampling period sequence is traversed in reverse chronological order. The absolute value of the difference between the current temperature and the historical temperature is calculated and compared with a preset temperature threshold. The preset temperature threshold is based on the temperature resolution of the hair removal instrument's temperature sensor and is set to a value no lower than the temperature resolution, which both filters out measurement noise interference and ensures the effective capture of temperature changes. When a historical sampling period that meets the conditions is encountered for the first time, the traversal stops and it is determined as the target sampling period. The relative azimuth angles of the previous sampling period are extracted as the baseline phase to ensure that the baseline phase comes from the stable phase before the temperature change.

[0026] The difference in skin surface temperature and the difference in azimuth angle between the current sampling period and the selected sampling period are used as the changes in skin surface temperature and the changes in azimuth angle. The current temperature-sensitive response slope is obtained by the ratio of the change in mutual angular position to the change in skin surface temperature. Specifically, the temperature and relative angle values ​​of the current sampling period and the selected sampling period are extracted separately. The difference between the two is calculated as the change in skin surface temperature and the change in relative angle. The change in relative angle is divided by the change in skin surface temperature to obtain the current temperature-sensitive response slope. This slope quantitatively reflects the rate at which the relative angle between the atomized gas pressure and the essential oil flow changes with skin temperature under the current state. A larger absolute value indicates that a unit temperature change will cause a significant change in the relative angle, and the system is more sensitive to skin temperature fluctuations. A smaller absolute value indicates that the temperature change has a weaker impact on the relative angle, providing a quantitative basis for subsequent judgment and adjustment.

[0027] The threshold determination module is used to calculate the minimum significant response threshold based on the phase resolution and temperature resolution of the hair removal instrument sensor, and to determine and analyze the temperature-sensitive response slope and the minimum significant response threshold to obtain the temperature-controlled atomization jump zone state. In an embodiment of the present invention, the minimum significant response threshold is calculated based on the phase resolution and temperature resolution of the hair removal instrument sensor, and the temperature-sensitive response slope and the minimum significant response threshold are judged and analyzed to obtain the temperature-controlled atomization jump band state, including: reading the phase resolution and temperature resolution of the hair removal instrument sensor. The ratio of phase resolution to temperature resolution is used as the minimum significant response threshold. Specifically, obtain the technical parameters of the phase sensor and temperature sensor configured in the hair removal device. Phase resolution refers to the smallest change in relative angular position that the sensor can distinguish, and temperature resolution refers to the smallest change in temperature that the sensor can distinguish. These parameters can be obtained from the sensor's manufacturer's technical manual. Dividing the phase resolution by the temperature resolution yields the minimum significant response threshold. This threshold reflects the minimum rate at which the relative angular position changes with temperature can be effectively identified under the current sensor accuracy, ensuring that only significant changes are considered to be caused by actual changes in the system's state.

[0028] Determine whether the current temperature-sensitive response slope is not less than the minimum significant response threshold to obtain the first determination result; Determine whether the sign of the current temperature-sensitive response slope is consistent with that of the temperature-sensitive response slope in the previous sampling period to obtain the second determination result; If the first determination result is that the current temperature-sensitive response slope is not less than the minimum significant response threshold, and the second determination result is that the sign has changed, then it is determined that the temperature-controlled atomization jump zone state has been entered; otherwise, it is determined that the temperature-controlled atomization jump zone state has not been entered. Specifically, the absolute value of the current temperature-sensitive response slope is compared with the minimum significant response threshold. If it is not less than the threshold, the first judgment result is "yes," indicating that the slope change has actual physical significance; if it is less than the threshold, it is "no." The temperature-sensitive response slope of the previous sampling period is extracted, and the signs of the two are compared. If they are different, the second judgment result is "yes," indicating that the trend of change has reversed.

[0029] Specifically, if both the first and second determinations are true, the system is determined to have entered the temperature control atomization transition zone, requiring targeted parameter adjustments; otherwise, it is determined not to have entered this zone, and no special adjustments are needed. This combined determination accurately identifies special system states, providing a clear basis for switching control strategies.

[0030] The frequency modulation control module is used to adjust the atomization drive angular frequency of the hair removal instrument according to the temperature control atomization jump zone state, so as to obtain the updated atomization drive angular frequency. In an embodiment of the present invention, the atomization driving angular frequency of the hair removal instrument is tuned according to the state of the temperature-controlled atomization transition zone to obtain an updated atomization driving angular frequency, including: if the temperature-controlled atomization transition zone state is not entered, the current atomization driving angular frequency is directly used as the updated atomization driving angular frequency. If the temperature-controlled atomization transition zone has been entered, the adjustment frequency is obtained based on the minimum step value of the atomization drive angular frequency. Calculate the temperature-sensitive response slope of the hair removal instrument at the adjusted frequency; The current temperature-sensitive response slope is compared with the temperature-sensitive response slope corresponding to the adjustment frequency, and the atomization drive angular frequency is updated in the direction that reduces the absolute value of the current temperature-sensitive response slope. Specifically, before entering the transition zone, the current atomization drive angular frequency remains unchanged. Once entered, the minimum step value of the atomization drive angular frequency is obtained, and the current frequency is calculated by adding or subtracting the minimum step value to obtain two adjustment frequencies. The hair removal instrument is controlled to run at each adjustment frequency for no less than one phase-locked integration window duration, data is collected, and the corresponding temperature-sensitive response slope is calculated.

[0031] Specifically, the current slope is compared with the absolute value of the slope at each adjustment frequency, and the adjustment frequency that reduces the absolute value of the slope is selected as the updated atomization drive angular frequency, so that the system returns to a state where the phase and temperature correlation characteristics are stable.

[0032] The opening adjustment module is used to adjust the opening of the essential oil delivery of the hair removal device based on the updated atomization drive angular frequency; In an embodiment of the present invention, adjusting the essential oil delivery opening of the hair removal device based on the updated atomization drive angular frequency includes: obtaining the adjustment opening based on the minimum step value of the essential oil delivery opening of the hair removal device under the updated atomization drive angular frequency. Calculate the relative angle between the atomizing air pressure and the essential oil flow rate of the hair removal instrument under the adjusted opening; Specifically, the essential oil delivery opening is a quantitative parameter that measures the degree of opening of the essential oil delivery valve in a hair removal device. It reflects the proportion of essential oil flow through the valve per unit time. The phase correlation between atomizing pressure and essential oil flow can be optimized by adjusting the opening.

[0033] Specifically, after the hair removal instrument stabilizes under the updated drive angular frequency, the minimum step value of the essential oil delivery opening is obtained. The minimum step value for adding or subtracting from the current opening is then calculated to obtain two adjustment openings. The bypass valve is controlled to adjust to each opening and stabilize for at least one phase-locked integration window duration. Data is collected and the corresponding mutual position angles are calculated.

[0034] The mutual azimuth angle corresponding to the adjusted opening is compared with the baseline phase, and the direction of reducing the absolute value of the difference between the mutual azimuth angle and the baseline phase is used to update the essential oil delivery opening; Specifically, the absolute value of the deviation between the mutual azimuth angle and the baseline phase under each adjustment opening is calculated, and the adjustment opening with the smaller deviation is selected as the updated essential oil delivery opening, so that the mutual azimuth angle is closer to the baseline phase, enhancing the stability of the phase relationship and ensuring the adaptability of essential oil atomization to skin condition.

[0035] To address the aforementioned problems, this invention also provides a method for controlling the atomization of essential oils in an intelligent hair removal device. The method includes: S1, collecting time-series data of the atomization pressure, essential oil flow rate, and skin surface temperature of the hair removal device; performing phase-locked loop (PLL) demodulation on the atomization pressure and essential oil flow rate to obtain their relative positions; S2, calculating the temperature-sensitive response slope based on the change in relative positions and the change in skin surface temperature; S3, calculating the minimum significant response threshold based on the phase resolution and temperature resolution of the hair removal device's sensors; and performing a judgment analysis on the temperature-sensitive response slope and the minimum significant response threshold to obtain the temperature-controlled atomization transition zone state; S4, adjusting the atomization driving angular frequency of the hair removal device according to the temperature-controlled atomization transition zone state to obtain an updated atomization driving angular frequency; and S5, adjusting the essential oil delivery opening of the hair removal device based on the updated atomization driving angular frequency.

[0036] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An essential oil atomization control system for an intelligent hair removal instrument, characterized in that, include: The data acquisition module is used to collect time-series data of the atomized air pressure, essential oil flow rate and skin surface temperature of the hair removal instrument. The atomized air pressure and essential oil flow rate are demodulated by phase-locked phase-sensitive detection to obtain the mutual position angle of the atomized air pressure and essential oil flow rate. The slope calculation module is used to calculate the temperature-sensitive response slope based on the change in mutual azimuth angle and the change in skin surface temperature. The threshold determination module is used to calculate the minimum significant response threshold based on the phase resolution and temperature resolution of the hair removal instrument sensor, and to determine and analyze the temperature-sensitive response slope and the minimum significant response threshold to obtain the temperature-controlled atomization jump zone state. The frequency modulation control module is used to adjust the atomization drive angular frequency of the hair removal instrument according to the temperature control atomization jump zone state, so as to obtain the updated atomization drive angular frequency. The opening adjustment module is used to adjust the opening of the essential oil delivery of the hair removal device based on the updated atomization drive angular frequency.

2. The essential oil atomization control system for an intelligent hair removal instrument according to claim 1, characterized in that, Time-series data of atomized gas pressure, essential oil flow rate, and skin surface temperature from the hair removal device were collected. Phase-locked phase-sensitive detection and demodulation were performed on the atomized gas pressure and essential oil flow rate to obtain their relative positions, including: Time series data of atomized air pressure, essential oil flow rate and skin surface temperature of hair removal instrument are collected at a fixed sampling period; the product signal of atomized air pressure and essential oil flow rate is multiplied by the cosine and sine terms corresponding to the atomization drive angular frequency of hair removal instrument, respectively, to obtain the cosine product signal and the sine product signal. Within the set phase-locked integration window, the cosine product signal and the sine product signal are demodulated by phase-locked phase-sensitive detection to obtain the discrete integral values ​​of the in-phase component and the quadrature component. The discrete integral values ​​of the in-phase and quadrature components are calculated by using the arctangent function to obtain the mutual position angle between the atomizing pressure and the essential oil flow rate.

3. The essential oil atomization control system for an intelligent hair removal instrument according to claim 2, characterized in that, The slope of the thermosensitive response is calculated based on the change in mutual angular position and the change in skin surface temperature, including: Traverse the sampling period sequence in reverse chronological order and select the first sampling period that satisfies the condition that the absolute value of the skin surface temperature difference with the current sampling period is not less than the preset temperature threshold. Set the relative position angle of the previous sampling period as the baseline phase; The difference in skin surface temperature and the difference in azimuth angle between the current sampling period and the selected sampling period are used as the changes in skin surface temperature and the changes in azimuth angle. The current temperature-sensitive response slope is obtained by the ratio of the change in mutual angular position to the change in skin surface temperature.

4. The essential oil atomization control system for an intelligent hair removal instrument according to claim 3, characterized in that, The minimum significant response threshold is calculated based on the phase resolution and temperature resolution of the hair removal instrument's sensor, including: Read the phase resolution and temperature resolution of the sensor in the hair removal device; The ratio of phase resolution to temperature resolution is used as the minimum significant response threshold.

5. The essential oil atomization control system for an intelligent hair removal instrument according to claim 4, characterized in that, The temperature-sensitive response slope and the minimum significant response threshold are analyzed to determine the temperature-controlled atomization transition zone state, including: Determine whether the current temperature-sensitive response slope is not less than the minimum significant response threshold to obtain the first determination result; determine whether the sign of the current temperature-sensitive response slope is consistent with that of the temperature-sensitive response slope in the previous sampling period to obtain the second determination result. If the first determination result is that the current temperature-sensitive response slope is not less than the minimum significant response threshold, and the second determination result is that the sign changes, then it is determined that it has entered the temperature-controlled atomization transition zone state; otherwise, it is determined that it has not entered the temperature-controlled atomization transition zone state.

6. The essential oil atomization control system for an intelligent hair removal instrument according to claim 5, characterized in that, The atomization drive angular frequency of the hair removal instrument is adjusted according to the temperature control atomization transition zone state to obtain the updated atomization drive angular frequency, including: if the temperature control atomization transition zone state is not entered, the current atomization drive angular frequency is directly used as the updated atomization drive angular frequency. If the temperature-controlled atomization transition zone has been entered, the adjustment frequency is obtained based on the minimum step value of the atomization drive angular frequency; the temperature-sensitive response slope of the hair removal instrument under the adjustment frequency is calculated. The current temperature-sensitive response slope is compared with the temperature-sensitive response slope corresponding to the adjusted frequency, and the atomization drive angular frequency is updated in the direction that reduces the absolute value of the current temperature-sensitive response slope.

7. The essential oil atomization control system for an intelligent hair removal instrument according to claim 6, characterized in that, The oil delivery opening of the hair removal device is adjusted based on the updated atomization drive angular frequency, including: Under the updated atomization drive angular frequency, the adjustment opening is obtained based on the minimum step value of the essential oil delivery opening of the hair removal instrument; the relative angle between the atomization air pressure and the essential oil flow rate of the hair removal instrument under the adjustment opening is calculated. The mutual azimuth angle corresponding to the adjusted opening is compared with the baseline phase, and the direction of reducing the absolute value of the difference between the mutual azimuth angle and the baseline phase is used to update the essential oil delivery opening.

8. A method for controlling the atomization of essential oils in an intelligent hair removal instrument, characterized in that, The method includes: S1. Collect time-series data of atomized air pressure, essential oil flow rate and skin surface temperature of the hair removal instrument, and perform phase-locked phase-sensitive detection demodulation on atomized air pressure and essential oil flow rate to obtain the mutual position angle of atomized air pressure and essential oil flow rate. S2. Calculate the temperature-sensitive response slope based on the mutual angular change and the skin surface temperature change. S3. Calculate the minimum significant response threshold based on the phase resolution and temperature resolution of the hair removal instrument sensor, and analyze the temperature-sensitive response slope and the minimum significant response threshold to obtain the temperature-controlled atomization transition zone state. S4. Adjust the atomization drive angular frequency of the hair removal instrument according to the temperature control atomization jump zone state to obtain the updated atomization drive angular frequency. S5. Adjust the oil delivery opening of the hair removal instrument based on the updated atomization drive angular frequency.

Images