Electric dental chair water shortage early warning method and system

Abstract

The invention relates to the technical field of data processing, in particular to an electric dental chair water shortage early warning method and system. The method comprises the steps that pressure data and flow data at each moment are collected, and the water storage capacity monitored by a flowmeter at the current moment and the water storage capacity monitored by a water pressure sensor at the current moment are obtained; according to the flow data and the pressure data in each historical use period, the precision of a flow meter and a sensor is obtained, and the real water storage capacity at the current moment is obtained based on the precision and the water storage capacity monitored by the flow meter and the water pressure sensor; according to the real water storage capacity, the water level sensitivity degree at the current moment is obtained; according to the water level sensitivity degree, the monitoring times increased between the current moment and the next moment are obtained, then the real water storage capacity of each newly-added monitoring moment is obtained, and water shortage early warning is carried out, the monitoring times are adaptively increased according to the water level sensitivity degree, and the delay risk of water shortage early warning is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of data processing, and in particular to a water shortage early warning method and system for an electric dental chair. Background Art

[0002] Electric dental chairs, as an indispensable piece of equipment in modern dental practice, are widely used in various dental procedures, improving treatment efficiency and providing patients with a more comfortable treatment experience. Designed with convenience and operational flexibility in mind, electric dental chairs are typically equipped with multiple features, including a water reservoir and a fluid circulation system. These systems provide the necessary water for oral irrigation, cooling, and other operations during treatment. However, as the equipment is used over time, the water in the reservoir gradually depletes. If not replenished promptly, water shortages may occur. Water shortages not only affect the normal operation of the equipment but can also cause malfunctions in the fluid circulation system, impacting the continuity and smooth progress of dental treatment. In more serious cases, water shortages can damage the equipment, interrupt treatment, cause inconvenience to patients, and even affect treatment effectiveness and the doctor's work progress. Therefore, to prevent equipment damage or treatment interruptions caused by water shortages, an efficient water shortage warning method is urgently needed. An ideal warning system should be able to monitor the water level in the reservoir and issue an alert before the water level becomes too low, thereby ensuring normal equipment operation and safeguarding the patient's treatment progress.

[0003] The accuracy of the equipment directly affects the accuracy of the collected data. If the flow meter or water pressure sensor is not accurate enough, the collected flow data or pressure data may deviate from the actual value, resulting in incorrect water storage calculations, affecting subsequent decisions and operations. In addition, the fixed setting of the frequency interval of data collection may result in the failure to issue early warnings when the water storage is low, thereby posing a risk of delay. Summary of the Invention

[0004] In order to solve the technical problems that insufficient accuracy of the equipment may lead to erroneous water storage calculation and the fixed setting of the frequency interval of data collection may lead to the risk of delayed warning when the water storage level is low, the present invention provides a water shortage warning method and system for an electric dental chair.

[0005] In a first aspect, the present invention provides a method for warning of water shortage in an electric dental chair, which adopts the following technical solution: A method for warning of water shortage in an electric dental chair, comprising the steps of: Collect pressure data and flow data at each moment, and obtain the water storage volume monitored by the flow meter and the water storage volume monitored by the water pressure sensor at the current moment; Obtain a water consumption data sequence for each historical usage cycle of the water storage device; segment the water consumption data sequence for each historical usage cycle to obtain a water consumption data segment for each historical usage cycle; obtain the flow rate dispersion of each water consumption data segment in all historical usage cycles based on the difference in flow rate data corresponding to the same water consumption data segment in all historical usage cycles; obtain the accuracy of the flow meter based on the flow rate dispersion; obtain each pressure data and its corresponding water storage capacity in each historical usage cycle of the water storage device; obtain the accuracy of the water pressure sensor based on the difference between the pressure data corresponding to the same water storage capacity in different historical usage cycles; Based on the accuracy of the flow meter and the water pressure sensor, the water storage capacity monitored by the flow meter and the water storage capacity monitored by the water pressure sensor at the current moment are weighted to obtain the actual water storage capacity at the current moment; based on the actual water storage capacity, the water level sensitivity and fit at the current moment are obtained; based on the water level sensitivity and fit, the increased number of monitoring times between the current moment and the next moment is obtained, and the actual water storage capacity at each newly added monitoring moment is obtained to issue a water shortage warning.

[0006] The innovation of the present invention lies in that according to the water level sensitivity at the current moment, the increased number of monitoring times between the current moment and the next moment is adaptively obtained. By solving the monitoring frequency, the risk of delay caused by the system's inability to issue an early warning in time when the water storage capacity is low is solved. Furthermore, according to the actual water storage capacity of the water reservoir, the water level sensitivity at the current moment is obtained, which can accurately reflect the current water level sensitivity of the water reservoir; further, according to the pressure data and flow data, the water storage capacity monitored by the flow meter and water pressure sensor at the current moment is obtained, and the real-time water storage capacity of the water reservoir is evaluated in multiple dimensions to avoid the errors or limitations of single sensor data; and the data of the flow meter and water pressure sensor in the historical use cycle of the water reservoir are analyzed to evaluate the accuracy of the flow meter and water pressure sensor, and the water storage capacity monitored by the flow meter and water pressure sensor at the current moment are weighted and summed to obtain a more realistic water storage capacity.

[0007] Preferably, the step of obtaining a water consumption data sequence in each historical usage cycle of the water storage device includes: A complete cycle in history from a full water state to a water shortage state of the water storage tank is recorded as a historical usage cycle of the water storage tank, and each flow data in each historical usage cycle is obtained; the sum of the flow data before each flow data in each historical usage cycle is used as each water consumption data in each historical usage cycle, forming a water consumption data sequence for each historical usage cycle.

[0008] Preferably, obtaining the water consumption data segment for each historical usage cycle includes: A segmentation parameter k is preset. For any water consumption data sequence of a historical usage period, the result value of rounding up the last water consumption data in the water consumption data sequence of the historical usage period is recorded as a; if a is an even number, the water consumption data sequence of the historical usage period is uniformly divided into a / k water consumption data segments; if a is an odd number, the water consumption data sequence of the historical usage period is uniformly divided into (a+1) / k water consumption data segments.

[0009] Preferably, the step of obtaining the flow dispersion degree of each water consumption data segment in all historical periods includes: ; Where, Represents the flow dispersion degree of the i-th water consumption data segment in all historical usage cycles; Represents the number of historical usage cycles; represents the average flow rate of the i-th water consumption data segment in the j-th historical usage cycle; represents the mean of the average flow rate of the i-th water consumption data segment in all historical usage cycles; || represents the absolute value symbol; norm() represents the normalization function.

[0010] Preferably, obtaining the accuracy of the water pressure sensor includes: Obtain the pressure dispersion degree of each pressure data set; ; Where, Represents the accuracy of the water pressure sensor; Represents the number of pressure data sets; Represents the pressure dispersion degree of the c-th pressure data set; Represents the mean of the pressure dispersion of all pressure data sets; exp() represents the exponential function with a natural constant as the base; || represents the absolute value symbol.

[0011] This facilitates the subsequent weighting of the water storage capacity monitored by the water pressure sensor at the current moment according to the accuracy of the water pressure sensor.

[0012] Preferably, obtaining the pressure dispersion degree of each pressure data set includes: The number of representative water storage capacities, T, is preset. In each historical usage cycle, T identical water storage values ​​are obtained from the water storage data as the representative water storage capacity. Several pressure data of any representative water storage capacity in all historical usage cycles are taken as a pressure data set to obtain all pressure data sets. The mean of the difference between all pairwise pressure data in each pressure data set is recorded as the pressure dispersion degree of each pressure data set.

[0013] Preferably, obtaining the actual water storage capacity at the current moment includes: ; Where, Represents the actual water storage at the current moment; Represents the accuracy of the water pressure sensor; Represents the accuracy of the flow meter; Represents the water storage capacity monitored by the flow meter at the current moment; Represents the water storage capacity monitored by the water pressure sensor at the current moment.

[0014] By weighting the water storage data from the flow meter and water pressure sensor, a comprehensive and more accurate current water storage capacity can be obtained.

[0015] Preferably, obtaining the water level sensitivity and fit at the current moment includes: ; Where, Represents the water level sensitivity at the current moment; Represents the actual water storage at the current moment; The actual water storage capacity at a moment before the current moment; The water level sensitivity of the N moments before the current moment and the current moment are used to form a water level sensitivity sequence. The water level sensitivity sequence is linearly fitted using the least squares method to obtain the fitting degree at the current moment.

[0016] This facilitates the subsequent adaptive acquisition of the increased number of monitoring times between the current moment and the next moment based on the water level sensitivity at the current moment.

[0017] Preferably, the step of obtaining the increased number of monitoring times between the current moment and the next moment, and obtaining the actual water storage capacity at each newly added monitoring moment, and performing water shortage warning includes: The water level sensitivity threshold T2 and the fitting threshold T3 are preset. If the water level sensitivity at the current moment is greater than or equal to T2, and the fitting degree at the current moment is greater than or equal to T3, then the water tank at the current moment belongs to the high-sensitivity water level; , Represents the number of monitoring times increased between the current moment and the next moment; Represents the water level sensitivity at the current moment; The pre-set warning threshold T1 is used to obtain the actual water storage capacity at each newly added monitoring moment. If the actual water storage capacity at any newly added monitoring moment is less than or equal to the warning threshold T1, the system will issue a water shortage warning.

[0018] Avoid delayed warning of water shortage in the system.

[0019] In a second aspect, the present invention provides a water shortage warning system for an electric dental chair, which adopts the following technical solutions: A water shortage warning system for an electric dental chair comprises a processor and a memory, wherein the memory stores computer program instructions. When the computer program instructions are executed by the processor, the above-mentioned water shortage warning method for an electric dental chair is implemented.

[0020] By adopting the above technical solution, the above-mentioned electric dental chair water shortage warning method is generated into a computer program and stored in a memory to be loaded and executed by a processor, thereby making a terminal device based on the memory and the processor for easy use.

[0021] The present invention has the following technical effects: the present invention first obtains the water storage capacity monitored by the flow meter and water pressure sensor at the current moment based on the pressure data and flow data, and can evaluate the real-time water storage capacity of the water tank in multiple dimensions, avoid the errors or limitations of single sensor data, and provide more accurate monitoring results; then analyzes the data of the flow meter and water pressure sensor in the historical use cycle of the water tank, evaluates the accuracy of the flow meter and water pressure sensor, and takes a weighted sum of the water storage capacity monitored by the flow meter and water pressure sensor at the current moment to obtain a more realistic water storage capacity; then, based on the realistic water storage capacity, obtains the water level sensitivity at the current moment, and then adaptively obtains the increased number of monitoring times between the current moment and the next moment, which solves the risk of delay caused by the system's inability to issue an early warning in time when the water storage capacity is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a flow chart of a method for warning water shortage of an electric dental chair according to an embodiment of the present invention. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, but not all of the embodiments.

[0024] The embodiment of the present invention discloses a method for warning water shortage of an electric dental chair, referring to Figure 1 , including steps S1 to S4: S1: Collect pressure data and flow data at each moment.

[0025] In an embodiment of the present invention, a collection frequency of 1 minute / time is preset, a water pressure sensor is installed at the bottom of the electric dental chair water reservoir, and a flow meter is installed on the water outlet pipe of the electric dental chair water reservoir. During the use of the electric dental chair, pressure data and flow data are collected at each moment.

[0026] S2: Obtain the water storage capacity monitored by the flow meter at the current moment and the water storage capacity monitored by the water pressure sensor at the current moment, obtain the accuracy of the flow meter and the accuracy of the water pressure sensor based on the flow data and pressure data in each historical usage cycle, and take the weighted sum of the water storage capacity monitored by the flow meter at the current moment and the water storage capacity monitored by the water pressure sensor at the current moment based on the said accuracy to obtain the actual water storage capacity at the current moment.

[0027] It should be noted that the data collected using a single sensor (water pressure sensor / flow meter) is not reliable enough. Therefore, in order to ensure the accuracy of the water storage calculation, the present invention combines the data collected by the water pressure sensor and the flow meter to reduce the error caused by a single sensor. The flow data at each moment is known, that is, the water consumption at each moment, because the water storage at the current moment is the capacity of the electric toothbrush chair water reservoir minus the flow data of all moments before the current moment; then, based on the known water pressure and water level conversion formula and the pressure data at the current moment, the water level at the current moment is calculated, and then the water storage monitored by the water pressure sensor at the current moment is obtained.

[0028] In the embodiment of the present invention, the sum of the flow data at all times before the current moment is recorded as the water consumption data at the current moment; the water storage capacity monitored by the flow meter at the current moment is obtained by subtracting the water consumption data at the current moment from the capacity of the electric toothbrush chair water reservoir; According to the pressure data at the current moment, the water level height at the current moment is obtained; the water level height at the current moment is multiplied by the bottom area of ​​the electric toothbrush chair water reservoir to obtain the water storage capacity monitored by the water pressure sensor at the current moment; it should be noted that obtaining the water level height at the current moment according to the conversion formula between water pressure and water level height is an existing technology, and in the embodiments of the present invention, it will not be described in detail.

[0029] It should be noted that the accuracy of the equipment directly affects the accuracy of the data. If the equipment accuracy is insufficient, the recorded flow data or pressure data may deviate from the actual value, resulting in incorrect water storage calculation, affecting subsequent decision-making and operations. Therefore, the present invention needs to evaluate the accuracy of the flow meter and the accuracy of the water pressure sensor, and then perform weighted summation of the water storage capacity monitored by the flow meter at the current moment and the water storage capacity monitored by the water pressure sensor at the current moment according to the accuracy of the flow meter and the accuracy of the water pressure sensor to obtain the actual water storage capacity at the current moment.

[0030] It should be further explained that the usage cycle of the electric dental chair represents the entire process of the electric dental chair water reservoir going from a full water state to a water-deficient state. Therefore, the present invention evaluates the accuracy of the flow meter and the water pressure sensor by combining the data of the current flow meter and the water pressure sensor in each historical usage cycle.

[0031] It should be further explained that in each historical usage cycle, the flow meter collects flow data at different times. It is known that the sum of all flow data before a certain moment is the water consumption data at each moment. The flow data is matched with the water consumption data. It is known that as the water consumption in the water storage tank continues to increase during the water use process, the water level continues to decrease, and the water pressure will gradually decrease, which will cause the flow rate of the flow meter to gradually become smaller. Therefore, the flow data will decrease as the water consumption continues to increase in a water use cycle. Therefore, the present invention segments the water consumption data sequence of each historical usage cycle. If the values ​​of the flow data segments corresponding to the same water consumption data segment of all historical usage cycles are more similar, the accuracy of the flow meter will be better.

[0032] In the embodiment of the present invention, the process of obtaining the accuracy of the flow meter is as follows: The complete cycle of the electric dental chair water reservoir from full water state to water shortage in the history is recorded as the historical use cycle of the water reservoir, and each flow data in each historical use cycle is obtained. The sum of the flow data before each flow data in each historical usage cycle is used as each water consumption data in each historical usage cycle to form a water consumption data sequence for each historical usage cycle; it should be noted that each flow data in each historical usage cycle corresponds to one water consumption data.

[0033] A segmentation parameter k=4 liters is preset. In other embodiments, the implementer may preset the value of k according to specific implementation conditions. For any water consumption data sequence of a historical usage period, the result of rounding up the last water consumption data in the water consumption data sequence of the historical usage period is recorded as a. If a is an even number, the water consumption data sequence of the historical usage period is uniformly divided into a / k water consumption data segments; if a is an odd number, the water consumption data sequence of the historical usage period is uniformly divided into (a+1) / k water consumption data segments. Among them, the length of each water consumption data segment is the same, but the amount of water consumption data contained is not necessarily different; for example, if the water consumption data sequence of any historical usage period is: 1, 1.5, 1.7, 2.5, 2.9, 3.1, 3.9, 4.5, 5.4; then the water consumption data sequence of the historical usage period is evenly divided into three water consumption data segments; the first water consumption data segment includes 1, 1.5, 1, 7; the second water consumption data segment includes 2.5, 2.9, 3.1, 3.9; the third water consumption data segment includes 4.5, 5.4.

[0034] The average of the flow data corresponding to the water consumption data in each water consumption data segment of each historical usage period is recorded as the average flow of each water consumption data segment of each historical usage period; Get the flow dispersion of each water consumption data segment in all historical usage cycles: ; Where, Represents the flow dispersion degree of the i-th water consumption data segment in all historical usage cycles; Represents the number of historical usage cycles; represents the average flow rate of the i-th water consumption data segment in the j-th historical usage cycle; represents the mean of the average flow rate of the i-th water consumption data segment in all historical usage cycles; || represents the absolute value symbol; norm() represents the normalization function; The smaller the value of , the more similar the average flow rate of the i-th water consumption data segment in all historical usage cycles is. The smaller the flow rate dispersion of the i-th water consumption data segment in all historical usage cycles is, the higher the accuracy of the flow meter is.

[0035] The reciprocal of the mean of the flow dispersion of all water consumption data segments in all historical usage cycles is taken as the accuracy of the flow meter.

[0036] It should be noted that in each historical usage cycle, the water pressure sensor collects pressure data at different times, and each pressure data corresponds to its water storage capacity. Since the water pressure sensor installed at the bottom of the water tank will show a reading when there is water in the water tank, the obtained pressure data is not affected by whether the electric dental chair is in use, that is, the larger the pressure data is, the larger the water storage capacity data is. Therefore, the present invention uses the difference between several pressure data corresponding to the same water storage capacity in different historical usage cycles to represent the accuracy of the water pressure sensor. The smaller the difference, the better the accuracy of the water pressure sensor.

[0037] In an embodiment of the present invention, each pressure data and its corresponding water storage capacity in each historical usage cycle of the water storage device are obtained; the number of representative water storage capacities T=5 is preset. In other embodiments, the implementer may preset the value of T according to the specific implementation method, and in each historical usage cycle, T identical water storage capacity values ​​are obtained from the water storage capacity data as representative water storage capacities; if the number of identical water storage capacities in the historical usage cycle is less than T, the existing identical water storage capacity values ​​can be obtained as representative water storage capacities.

[0038] Take any number of pressure data representing the water storage capacity in all historical usage cycles as a pressure data set to obtain all pressure data sets; record the mean of the difference between all two pressure data in each pressure data set as the pressure dispersion degree of each pressure data set; It should be noted that the smaller the value of the pressure dispersion, the higher the accuracy of the water pressure sensor.

[0039] Get the accuracy of the water pressure sensor: ; Where, Represents the accuracy of the water pressure sensor; Represents the number of pressure data sets; Represents the pressure dispersion degree of the c-th pressure data set; Represents the mean of the pressure dispersion of all pressure data sets; exp() represents the exponential function with a natural constant as the base; || represents the absolute value symbol; The smaller the value, the smaller the difference between all pressure data sets corresponding to the water storage capacity in the historical usage cycle, which means that the accuracy of the sensor is higher.

[0040] In this embodiment of the present invention, the actual water storage capacity at the current moment is obtained: ; Where, Represents the actual water storage at the current moment; Represents the accuracy of the water pressure sensor; Represents the accuracy of the flow meter; Represents the water storage capacity monitored by the flow meter at the current moment; Represents the water storage capacity monitored by the water pressure sensor at the current moment.

[0041] S3: According to the actual water storage capacity at the current moment, obtain the water level sensitivity at the current moment, and according to the water level sensitivity at the current moment, obtain the increased number of monitoring times between the current moment and the next moment.

[0042] It should be noted that when the actual water storage at the current moment is less than the warning threshold, a water shortage warning can be issued. Otherwise, it is analyzed whether the water level at the current moment is a sensitive water level. If the actual water storage at the current moment is smaller and the change in water storage at the current moment compared to the previous moment is larger, it means that the water level at the current moment is more sensitive. And for a truly highly sensitive water level, the water level sensitivity will become greater with time. Therefore, if the water level sensitivity of all moments before the current moment meets this feature, it means that the water level at the current moment is more likely to be a sensitive water level.

[0043] In the embodiment of the present invention, the preset warning threshold T1=1000ml, if the actual water storage volume at the current moment is less than or equal to the warning threshold T1, the system issues a water shortage warning; If the actual water storage at the current moment is greater than the warning threshold T1, obtain the water level sensitivity at the current moment: ; Where, Represents the water level sensitivity at the current moment; Represents the actual water storage at the current moment; The actual water storage capacity at a moment before the current moment; The smaller the value is, the less the actual water storage capacity is at the current moment. The larger the value of is, the greater the change in water storage capacity at the current moment compared to the previous moment. The smaller the value of The larger the value is, the greater the water level sensitivity is at the current moment.

[0044] The water level sensitivity of the N moments before the current moment and the current moment are used to form a water level sensitivity sequence. The water level sensitivity sequence is linearly fitted using the least squares method to obtain the fitting degree at the current moment. It should be noted that the greater the fitting degree, the greater the water level sensitivity will be with the increase of time.

[0045] The preset water level sensitivity threshold T2=0.7 and the fit threshold T3=0.75. In other embodiments, the implementer may preset the thresholds according to the specific implementation situation; if the water level sensitivity at the current moment is greater than or equal to T2, and the fit at the current moment is greater than or T3, then the water tank at the current moment is at a highly sensitive water level.

[0046] It should be noted that when the water level of the water tank at the current moment is a sensitive water level, it means that the water surplus is relatively dangerous, then the number of monitoring times needs to be automatically increased in order to more accurately track the status of the water tank and respond to changes. If the water level at the current moment is more sensitive, the greater the number of monitoring times increased between the current moment and the next moment, the more flexible the monitoring frequency can be adjusted according to actual conditions to improve the system's responsiveness and accuracy.

[0047] In this embodiment of the present invention, if the water storage is at a high-sensitivity water level at the current moment, the number of monitoring times increased between the current moment and the next moment is obtained: ; Where, Represents the number of monitoring times increased between the current moment and the next moment; Represents the water level sensitivity at the current moment; The larger the value is, the more sensitive the water level is at the current moment. In this case, more monitoring times need to be added between the current moment and the next moment.

[0048] S4: According to the number of monitoring times added between the current moment and the next moment, the actual water storage capacity at each newly added monitoring moment is obtained to issue a water shortage warning.

[0049] It should be noted that the water storage capacity is monitored by increasing the number of monitoring times between the current moment and the next moment according to the number of monitoring times increased between the current moment and the next moment.

[0050] In an embodiment of the present invention, the actual water storage capacity at each newly added monitoring moment is obtained based on the number of monitoring times added between the current moment and the next moment. If the actual water storage capacity at any newly added monitoring moment is less than or equal to the warning threshold T1, the system issues a water shortage warning; otherwise, the actual water storage capacity at the next moment after the current moment is obtained and analyzed.

[0051] The above are all preferred embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for warning water shortage of an electric dental chair, characterized in that: Including steps: Collect pressure data and flow data at each moment, and obtain the water storage volume monitored by the flow meter and the water storage volume monitored by the water pressure sensor at the current moment; Obtaining a water consumption data sequence in each historical use cycle of the water storage device; segmenting the water consumption data sequence in each historical use cycle to obtain a water consumption data segment for each historical use cycle; Based on the differences in flow data corresponding to the same water consumption data segment in all historical usage cycles, the flow dispersion degree of each water consumption data segment in all historical cycles is obtained; based on the flow dispersion degree, the accuracy of the flow meter is obtained; the pressure data and the corresponding water storage capacity of the water storage device in each historical usage cycle are obtained; based on the differences between the pressure data corresponding to the same water storage capacity in different historical usage cycles, the accuracy of the water pressure sensor is obtained; Based on the accuracy of the flow meter and the water pressure sensor, the water storage capacity monitored by the flow meter and the water storage capacity monitored by the water pressure sensor at the current moment are weighted to obtain the actual water storage capacity at the current moment; According to the actual water storage capacity, the water level sensitivity and fit at the current moment are obtained; according to the water level sensitivity and fit, the increased number of monitoring times between the current moment and the next moment is obtained, and the actual water storage capacity at each newly added monitoring moment is obtained to issue a water shortage warning.

2. The electric dental chair water shortage warning method according to claim 1, characterized in that: The step of obtaining a water consumption data sequence in each historical usage cycle of the water storage device includes: A complete cycle in history from a full water state to a water shortage state of the water storage tank is recorded as a historical usage cycle of the water storage tank, and each flow data in each historical usage cycle is obtained; the sum of the flow data before each flow data in each historical usage cycle is used as each water consumption data in each historical usage cycle, forming a water consumption data sequence for each historical usage cycle.

3. The method for warning water shortage of an electric dental chair according to claim 1, characterized in that: The step of obtaining the water consumption data segment for each historical usage cycle includes: A segmentation parameter k is preset. For any water consumption data sequence of a historical usage period, the result value of rounding up the last water consumption data in the water consumption data sequence of the historical usage period is recorded as a; if a is an even number, the water consumption data sequence of the historical usage period is uniformly divided into a / k water consumption data segments; if a is an odd number, the water consumption data sequence of the historical usage period is uniformly divided into (a+1) / k water consumption data segments.

4. The method for warning water shortage of an electric dental chair according to claim 1, characterized in that: The method of obtaining the flow dispersion degree of each water consumption data segment in all historical periods includes: ; Where, Represents the flow dispersion degree of the i-th water consumption data segment in all historical usage cycles; Represents the number of historical usage cycles; represents the average flow rate of the i-th water consumption data segment in the j-th historical usage cycle; represents the mean of the average flow rate of the i-th water consumption data segment in all historical usage cycles; || represents the absolute value symbol; norm() represents the normalization function.

5. The method for warning water shortage of an electric dental chair according to claim 1, characterized in that: The obtaining of the accuracy of the water pressure sensor includes: Obtain the pressure dispersion degree of each pressure data set; ; Where, Represents the accuracy of the water pressure sensor; Represents the number of pressure data sets; Represents the pressure dispersion degree of the c-th pressure data set; Represents the mean of the pressure dispersion of all pressure data sets; exp() represents the exponential function with a natural constant as the base; || represents the absolute value symbol.

6. The method for warning water shortage of an electric dental chair according to claim 5, characterized in that: The obtaining of the pressure discreteness of each pressure data set includes: The number of representative water storage capacities, T, is preset. In each historical usage cycle, T identical water storage values ​​are obtained from the water storage data as the representative water storage capacity. Several pressure data of any representative water storage capacity in all historical usage cycles are taken as a pressure data set to obtain all pressure data sets. The mean of the difference between all pairwise pressure data in each pressure data set is recorded as the pressure dispersion degree of each pressure data set.

7. The method for warning water shortage of an electric dental chair according to claim 1, characterized in that: The obtaining of the actual water storage capacity at the current moment includes: ； Where, Represents the actual water storage at the current moment; Represents the accuracy of the water pressure sensor; Represents the accuracy of the flow meter; Represents the water storage capacity monitored by the flow meter at the current moment; Represents the water storage capacity monitored by the water pressure sensor at the current moment.

8. The method for warning water shortage of an electric dental chair according to claim 1, characterized in that: The acquisition of the water level sensitivity and fit at the current moment includes: ； Where, Represents the water level sensitivity at the current moment; Represents the actual water storage at the current moment; The actual water storage capacity at a moment before the current moment; The water level sensitivity of the N moments before the current moment and the current moment are used to form a water level sensitivity sequence. The water level sensitivity sequence is linearly fitted using the least squares method to obtain the fitting degree at the current moment.

9. The method for warning water shortage of an electric dental chair according to claim 1, characterized in that: The method of obtaining the increased number of monitoring times between the current moment and the next moment, and obtaining the actual water storage capacity at each newly added monitoring moment, and performing water shortage warning includes: The water level sensitivity threshold T2 and the fitting threshold T3 are preset. If the water level sensitivity at the current moment is greater than or equal to T2, and the fitting degree at the current moment is greater than or equal to T3, then the water tank at the current moment belongs to the high-sensitivity water level; , Represents the number of monitoring times increased between the current moment and the next moment; Represents the water level sensitivity at the current moment; The pre-set warning threshold T1 is used to obtain the actual water storage capacity at each newly added monitoring moment. If the actual water storage capacity at any newly added monitoring moment is less than or equal to the warning threshold T1, the system will issue a water shortage warning.

10. An electric dental chair water shortage warning system, characterized in that: include: A processor and a memory, wherein the memory stores computer program instructions, and when the computer program instructions are executed by the processor, an electric dental chair water shortage early warning method according to any one of claims 1 to 9 is implemented.

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