A method for monitoring platen status based on Hall effect

Abstract

The present invention relates to the technical field of platen state monitoring, and specifically to a platen state monitoring method based on the Hall effect, the method comprising: collecting monitoring data sequences; obtaining time-frequency response data sequences of each Hall sensor; obtaining each response data set; obtaining interference response values ​​of each response data set; and then constructing interference response data sequences of each Hall sensor; calculating response interference difference values ​​of each Hall sensor; and then calculating response gain parameters of each Hall sensor; and then obtaining response values ​​of array Hall sensors to platen state monitoring at each acquisition moment; and obtaining state monitoring thresholds, and then monitoring the state of the platen. The present invention reduces the influence of environmental magnetic field interference on the monitoring response of the array Hall sensor, and improves the accuracy of platen state monitoring based on the Hall effect.

Description

Technical Field

[0001] The invention relates to the technical field of platen state monitoring, and in particular to a platen state monitoring method based on the Hall effect. Background Art

[0002] With the rapid development of computer, network communication and database technology, the automation level of substations has flourished, greatly improving the efficiency and safety of power grid operation. Relay protection is an important part of substation automation system. The function of the relay protection outlet hard pressure plate is to start the circuit breaker tripping and other protection functions. It is the functional dividing point and status monitoring blind spot between the protection device and the primary equipment control circuit. Inaccurate pressure plate status detection may lead to frequent errors in pressure plate status verification, and also reduce the efficiency of accident fault handling.

[0003] Nowadays, the main methods for monitoring the pressure plate status in the power system are single-point Hall sensor monitoring method and array Hall sensor monitoring method. Among them, array Hall sensor monitoring has the advantages of wide coverage and high accuracy of pressure plate status monitoring compared to single-point Hall sensor monitoring. However, in the process of using array Hall sensors to monitor the pressure plate status, due to the increase in the number of sensors, while obtaining richer magnetic field data, the magnetic field in the surrounding environment has different degrees of interference with the magnetic field signals of the Hall sensors in the array. Therefore, when the magnetic field signals of all Hall sensors in the array are integrated to monitor the pressure plate status, the interference of the received magnetic field signals of different Hall sensors is quite different, resulting in large errors in the analysis of the pressure plate status using array Hall sensors, and the pressure plate status monitoring effect is generally low. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a platen state monitoring method based on the Hall effect to solve the existing problems.

[0005] A platen state monitoring method based on the Hall effect of the present invention adopts the following technical solution:

[0006] An embodiment of the present invention provides a platen state monitoring method based on the Hall effect, the method comprising the following steps:

[0007] Collecting a monitoring data sequence of each Hall sensor during the platen status monitoring process, wherein the monitoring data sequence is composed of magnetic field intensity values ​​collected by the Hall sensor;

[0008] Based on the extreme value distribution in the time-frequency of the monitoring data sequence, the time-frequency response data sequence of each Hall sensor is obtained; based on the amplitude change of the time-frequency response data sequence, each response data set is obtained;

[0009] Based on the fluctuation of the frequency of the data in the response data set and the similarity of the amplitude of the data between the response data sets, the interference response value of each response data set is obtained;

[0010] Constructing interference response data sequences of each Hall sensor based on the interference response values; obtaining response interference difference values ​​of each Hall sensor based on similarities between the interference response data sequences;

[0011] The response gain parameter of each Hall sensor is obtained based on the proportion of the response interference difference value in the overall level; the response value of the array Hall sensor to the pressure plate state monitoring at each acquisition time is obtained based on the response gain parameter and the magnetic field strength value;

[0012] The state monitoring threshold is obtained based on the difference between the maximum values ​​of the magnetic field strength when the pressure plate is in the closed state and the open state, and the state of the pressure plate is monitored based on the relationship between the response value and the state monitoring threshold.

[0013] Furthermore, the method for acquiring the time-frequency response data sequence is:

[0014] Use the time-frequency analysis method to obtain the time-frequency curve of the monitoring data sequence of each Hall sensor;

[0015] The maximum point of each time-frequency curve is obtained, and the horizontal coordinates corresponding to the maximum point are sorted in ascending order of time to obtain each time-frequency response data sequence.

[0016] Further, the method for obtaining the response data set is:

[0017] The first-order difference sequence of each time-frequency response data sequence is obtained, the median of the first-order difference sequence is used as the division threshold, the elements corresponding to the first-order differences greater than the division threshold in the time-frequency response data sequence are used as the division time points, the time-frequency curve is divided according to the division time points, and the sets of each data on the divided time-frequency curve are used as each response data set.

[0018] Furthermore, the formula of the interference response value is: ; In the formula, Indicates The disturbance response value of the response data set; and Respectively represent and The coefficient of variation of the frequency values ​​of all data points in the response data set; Indicates and The Jaccard coefficient between the amplitudes of all data points in a response data set; Indicates the number of response data sets, For the A response data set.

[0019] Furthermore, the interference response data sequence is a sequence composed of interference response values ​​of all response data sets of each Hall sensor.

[0020] Furthermore, the formula of the response interference difference value is: ;in, Indicates The response interference difference value of each Hall sensor; and Respectively represent and The interference response data sequence of the Hall sensor, express and The distance between Indicates the number of Hall sensors, For the A Hall sensor.

[0021] Further, the method for obtaining the response gain parameter is:

[0022] The sum of the response interference difference values ​​of all the Hall sensors is calculated, and the ratio of the response interference difference value of each Hall sensor to the sum is calculated as the response gain parameter of each Hall sensor.

[0023] Further, the method for obtaining the response value is:

[0024] For each acquisition moment, the product of the magnetic field strength value of each Hall sensor and the response gain parameter is calculated, and the sum of the products of all Hall sensors is used as the response value of the array Hall sensor to the pressure plate state monitoring at each acquisition moment.

[0025] Furthermore, the method for obtaining the state monitoring threshold is:

[0026] For all acquisition moments when the pressure plate is in the closed and open states during the pressure plate status monitoring process, the minimum and maximum values ​​of the magnetic field strength are obtained, the ratio of the difference between the minimum and maximum values ​​and the number 2 is calculated, and the sum of the maximum value and the ratio result is used as the status monitoring threshold.

[0027] Further, the monitoring of the state of the pressing plate based on the relationship between the response value and the state monitoring threshold value includes:

[0028] If the calculated response value of the array Hall sensor to the pressure plate state monitoring is greater than the state monitoring threshold, it means that the pressure plate is in a closed state; if the calculated response value of the array Hall sensor to the pressure plate state monitoring is less than or equal to the state monitoring threshold, it means that the pressure plate is in an open state.

[0029] The present invention has at least the following beneficial effects:

[0030] The present invention proposes a pressure plate state monitoring method based on the Hall effect. Considering that in the process of using an array type Hall sensor to monitor the pressure plate state, the Hall sensor is affected by the environmental magnetic field, resulting in large differences in the state monitoring response, which in turn affects the accuracy of the pressure plate state monitoring using the array type Hall sensor.

[0031] In response to the above problems, the present invention collects the magnetic field strength value during the pressure plate status monitoring process through Hall sensors, and obtains the interference response value during the pressure plate status monitoring process according to the time-frequency response characteristics of the magnetic field changes of each Hall sensor during the monitoring process. The beneficial effect lies in combining the relative disorder characteristics of the response in different time periods during the pressure plate monitoring process to accurately analyze the time-frequency response differences of each Hall sensor affected by the environmental magnetic field.

[0032] Based on the response difference of each Hall sensor, the relative response characteristics between different Hall sensors are analyzed, wherein the time-frequency response characteristics of each Hall sensor are divided into the same data for other Hall sensors for comparative analysis of relative response characteristics. The beneficial effect is that the response characteristics of each Hall sensor affected by the environmental magnetic field are comprehensively analyzed, and the degree to which the relative response differences of the Hall sensor for pressure plate state monitoring are interfered by the environmental magnetic field is accurately analyzed, the influence of the environmental magnetic field interference on the monitoring response of the array Hall sensor is reduced, and the accuracy of pressure plate state monitoring based on the Hall effect is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions and advantages in the embodiments of the present invention or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 A flow chart of a platen state monitoring method based on the Hall effect provided by the present invention;

[0035] Figure 2 A schematic diagram of platen status monitoring provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0036] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following is a detailed description of the specific implementation method, structure, characteristics and effects of a platen state monitoring method based on the Hall effect proposed by the present invention in combination with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures or characteristics in one or more embodiments may be combined in any suitable form.

[0037] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

[0038] A specific scheme of a platen state monitoring method based on the Hall effect provided by the present invention is described in detail below with reference to the accompanying drawings.

[0039] An embodiment of the present invention provides a platen status monitoring method based on the Hall effect. Specifically, the following platen status monitoring method based on the Hall effect is provided. Figure 1 , the method comprises the following steps:

[0040] Step S1, collecting monitoring data sequences of each Hall sensor in the process of monitoring the state of the pressure plate, wherein the monitoring data sequence is composed of magnetic field intensity values ​​collected by the Hall sensor.

[0041] The state of the pressure plate is monitored and analyzed by using an array of Hall sensors. Specifically, in this embodiment, the Hall sensors are evenly arranged on the pressure plate. Hall sensors, The size is 8; it should be noted that in other embodiments, the implementer can select the number and arrangement of sensors according to the size and shape of the pressure plate in the actual monitoring scene. Figure 2 As shown, h represents an array Hall sensor, 1, 2, 3... They respectively represent Hall sensors, which are used to collect data on magnetic field changes during the state change of pressure plate b, transmit the data collected by h to the pressure plate state collector c for state analysis, and transmit the analysis results to the pressure plate controller d to complete the monitoring of the pressure plate state.

[0042] The arranged Hall sensors collect the magnetic field strength value at each collection moment in the process of monitoring the pressure plate status, and the sequence composed of the magnetic field strength values ​​collected by each Hall sensor in ascending order of collection time is used as the monitoring data sequence of each Hall sensor in the process of monitoring the pressure plate status. Each monitoring data sequence represents the response data of the Hall sensor to the monitoring process of the pressure plate status up to the current collection time.

[0043] At this point, the monitoring data during the platen status monitoring process has been obtained.

[0044] Step S2, based on the extreme value distribution in the time-frequency of the monitoring data sequence, obtain the time-frequency response data sequence of each Hall sensor; based on the amplitude change of the time-frequency response data sequence, obtain each response data set; based on the volatility of the frequency of the data in the response data set and the similarity of the amplitude of the data between the response data sets, obtain the interference response value of each response data set; based on the interference response value, construct the interference response data sequence of each Hall sensor; based on the similarity between the interference response data sequences, obtain the response interference difference value of each Hall sensor; based on the proportion of the response interference difference value in the overall level, obtain the response gain parameter of each Hall sensor.

[0045] Normally, during the pressure plate status monitoring process, when the pressure plate is closed, the magnetic field generated by the current passing through is strong and has a stable direction, and the magnetic field strength value is high and the direction remains relatively stable; when the pressure plate is disconnected, the current path is cut off, the magnetic field strength is significantly reduced, and the direction may change due to other factors such as surrounding electromagnetic interference; however, during the pressure plate monitoring process, the locations of the interference sources that interfere with the magnetic field in the environment are randomly distributed, and at the same time, the pressure plate state changes due to differences in the response of different Hall sensors to the magnetic field changes. Therefore, when using an array Hall sensor for pressure plate status monitoring, different Hall sensors in the array may have different responses due to interference, resulting in deviations in the response to changes in the pressure plate state.

[0046] In view of the above problems, in the process of using array-type Hall sensors to monitor the state of the pressure plate, this embodiment obtains the response data of each Hall sensor to the change of the pressure plate state, and then compares and analyzes the differences in the response changes of different Hall sensors to the environmental magnetic field interference, and based on the comparative analysis results, the pressure plate state response data obtained by the array-type Hall sensor is fused and analyzed to obtain accurate pressure plate state monitoring results. The specific calculation and analysis process is as follows:

[0047] When the pressure plate state changes, the pressure plate current also changes accordingly, causing the magnetic field strength around the pressure plate to change as well. However, the change in magnetic field strength is only analyzed by obtaining data through a single Hall sensor, and the influence of environmental interference on the response state of the Hall sensor cannot be avoided, thus affecting the analysis of the pressure plate state characteristics. Therefore, for the monitoring data sequence corresponding to each Hall sensor in the pressure plate state monitoring process, the monitoring data sequence is used as input, and short-time Fourier transform is used to obtain the time-frequency curve of the monitoring data sequence, wherein the horizontal axis of the time-frequency curve is time, and the vertical axis is frequency. The value of the data point on the curve represents the amplitude at the corresponding time and frequency. Short-time Fourier transform is a technology well known to those skilled in the art and will not be described in detail.

[0048] If the state of the pressure plate changes during the pressure plate monitoring process and is seriously affected by the interference of the environmental magnetic field, the response change of the magnetic field intensity value collected by the Hall sensor will be more complex, that is, the frequency response change in a short period of time will be more disordered. Based on the above analysis, the extreme point on the time-frequency curve corresponding to the monitoring data sequence is obtained, and the maximum point of the time-frequency curve is the maximum point of the ordinate value. The values ​​of the abscissa corresponding to all the maximum points are arranged in ascending time order as the time-frequency response data sequence in the pressure plate state monitoring process, and the first-order difference sequence of the time-frequency response data sequence is obtained. The median of the first-order difference sequence is used as the division threshold of the frequency response of the pressure plate state monitoring, and the value corresponding to the element in the first-order difference sequence greater than the division threshold in the time-frequency response data sequence of the pressure plate state monitoring is used as the division time point. All data on the time-frequency curve are divided according to all the division time points, and each group of data in the division result is used as a response data set of the pressure plate state monitoring process. The data corresponding to each segmentation time point is divided into a set of data points with the smallest horizontal coordinate among its adjacent data points, and the time range of each response data set is determined by the minimum and maximum values ​​of the horizontal coordinates of all the data in the set.

[0049] Furthermore, the Jaccard coefficient between each response data set and the amplitude data of all data points in each other response data set is calculated. The larger the Jaccard coefficient is, the smaller the difference in the amplitude change of the platen state monitoring interference at different times is; the coefficient of variation of the frequency values ​​of all data points in each response data set is calculated. The larger the coefficient of variation, the more significant the short-term response disorder characteristics of the platen state monitoring interference; the interference response value of each response data set is calculated based on the relative difference between the amplitude and frequency response of each response data set in a short period of time , the specific calculation formula is: ;in, Indicates The disturbance response value of the response data set; and Respectively represent and The coefficient of variation of the frequency values ​​of all data points in the response data set; Indicates and The Jaccard coefficient between the amplitudes of all data points in a response data set; Indicates the number of response data sets, For the A response data set.

[0050] It should be noted that the larger the calculated interference response value is, the more significant the response to the environmental magnetic field interference when the pressure plate state changes during the pressure plate monitoring process; conversely, the more subtle the response to the environmental magnetic field interference is.

[0051] Further, the sequence composed of the interference response values ​​of all response data sets of the monitoring data sequence of each Hall sensor is used as the interference response data sequence of each Hall sensor in the process of platen state monitoring. ; The interference response data sequence reflects the degree of difference in the response of the Hall sensor to the environmental magnetic field during the pressure plate state monitoring process.

[0052] By performing the relative difference analysis of the time-frequency response of the magnetic field intensity value collected by each Hall sensor in the process of platen status monitoring in a short period of time, the interference response data sequence of each Hall sensor in the process of platen status monitoring is obtained.

[0053] Furthermore, the response characteristics of each Hall sensor are divided in the same way based on the frequency response characteristics of the current Hall sensor. Therefore, if the time-frequency response change characteristics of the current Hall sensor affected by environmental noise are significantly different from those of other Hall sensors, the greater the response difference of the current Hall sensor affected by environmental magnetic field interference.

[0054] Specifically, the response interference difference value of each Hall sensor is calculated according to the interference response data sequence of different Hall sensors. , the specific calculation relationship is as follows: ;in, Indicates The response interference difference value of each Hall sensor; and Respectively represent and The interference response data sequence of the Hall sensor, express and The distance between them, this embodiment uses DTW distance as the distance measurement method, and the implementer can select other measurement methods according to the actual situation; Indicates the number of Hall sensors, For the A Hall sensor.

[0055] It should be noted that, based on the comparative analysis of the monitoring data based on the time-frequency response characteristics of each Hall sensor, the greater the possibility that the relative response difference of the current Hall sensor to the pressure plate status monitoring is interfered by the environmental magnetic field, the larger the calculated response interference difference value is, and the more likely a monitoring error is; conversely, the smaller the response interference difference value is, the smaller the possibility of a monitoring error is.

[0056] Furthermore, the response gain parameter corresponding to each Hall sensor in the process of platen state monitoring is obtained according to the response interference difference value of each Hall sensor. The response gain parameter reflects the difference in the response state of each Hall sensor affected by the environmental magnetic field during the platen status monitoring process. The specific calculation relationship is: ;in, Indicates The response gain parameter corresponding to each Hall sensor is: and Respectively represent and The response interference difference value of each Hall sensor; Indicates the number of Hall sensors; the larger the calculated response gain parameter is, the greater the difference in the response state of the Hall sensor when it is disturbed by the environmental magnetic field during the platen status monitoring process.

[0057] Step S3, based on the response gain parameter and the magnetic field strength value, obtain the response value of the array Hall sensor to the pressure plate state monitoring at each acquisition moment; obtain the state monitoring threshold based on the difference between the maximum values ​​of the magnetic field strength when the pressure plate is in the closed and open states, and monitor the state of the pressure plate based on the relationship between the response value and the state monitoring threshold.

[0058] Since the magnetic field strength changes greatly when the pressure plate is closed or open during the process of monitoring the pressure plate status using the Hall response, the closed or open state of the pressure plate can usually be determined based on the magnetic field strength. However, due to the magnetic field interference of environmental interference sources during the data acquisition process, differences in the response states of different Hall sensors will occur when using an array Hall sensor monitoring method.

[0059] Furthermore, in this embodiment, by analyzing the relative differences in the time domain responses of different Hall sensors during the monitoring process, the corresponding response gain parameters of each Hall sensor are obtained, and then the response value of the array Hall sensor to the pressure plate state monitoring is obtained through the response gain parameters. The specific calculation relationship is: ;in, Indicates the response value of the array Hall sensor to the pressure plate state monitoring at each acquisition moment; and Respectively represent The response gain parameters corresponding to each Hall sensor and the magnetic field strength value at each acquisition moment, Indicates the number of Hall sensors.

[0060] Furthermore, set the platen status monitoring threshold ,in The acquisition process is: obtain the minimum value of the magnetic field strength value at all acquisition moments when the pressure plate is in the closed and open states respectively and maximum value , then the calculation method of the state monitoring threshold is: It should be noted that the magnetic field strength value when the pressure plate is closed is greater than the magnetic field strength value when it is disconnected, that is, Therefore, if the calculated response value of the array Hall sensor to the pressure plate state monitoring is greater than the state monitoring threshold , it means that the pressure plate is in a closed state; if the calculated response value of the array Hall sensor to the pressure plate state monitoring is less than or equal to the state monitoring threshold , it means the pressure plate is in disconnected state.

[0061] It should be noted that the sequence of the above embodiments of the present invention is only for description and does not represent the advantages and disadvantages of the embodiments. The above is a description of a specific embodiment of the present invention. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0062] The various embodiments of the present invention are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments.

[0063] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit it. Modifications to the technical solutions described in the aforementioned embodiments, or equivalent replacement of some of the technical features therein, do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention.

Claims

1. A platen state monitoring method based on Hall effect, characterized in that: The method comprises the following steps: Collecting a monitoring data sequence of each Hall sensor during the platen status monitoring process, wherein the monitoring data sequence is composed of magnetic field intensity values ​​collected by the Hall sensor; Based on the extreme value distribution in the time-frequency of the monitoring data sequence, the time-frequency response data sequence of each Hall sensor is obtained; based on the amplitude change of the time-frequency response data sequence, each response data set is obtained; Based on the fluctuation of the frequency of the data in the response data set and the similarity of the amplitude of the data between the response data sets, the interference response value of each response data set is obtained; Constructing interference response data sequences of each Hall sensor based on the interference response values; obtaining response interference difference values ​​of each Hall sensor based on similarities between the interference response data sequences; The response gain parameter of each Hall sensor is obtained based on the proportion of the response interference difference value in the overall level; the response value of the array Hall sensor to the pressure plate state monitoring at each acquisition time is obtained based on the response gain parameter and the magnetic field strength value; Acquire a state monitoring threshold value based on the difference between the maximum values ​​of the magnetic field strength when the pressing plate is in a closed state and an open state, and monitor the state of the pressing plate based on the relationship between the response value and the state monitoring threshold value; The formula for the interference response value is: ; In the formula, Indicates The disturbance response value of the response data set; and Respectively represent and The coefficient of variation of the frequency values ​​of all data points in the response data set; Indicates and The Jaccard coefficient between the amplitudes of all data points in a response data set; Indicates the number of response data sets, For the A response data set; The formula for the response interference difference value is: ;in, Indicates The response interference difference value of each Hall sensor; and Respectively represent and The interference response data sequence of the Hall sensor, express and The distance between Indicates the number of Hall sensors, For the A Hall sensor.

2. A platen state monitoring method based on Hall effect as claimed in claim 1, characterized in that: The method for acquiring the time-frequency response data sequence is: Use the time-frequency analysis method to obtain the time-frequency curve of the monitoring data sequence of each Hall sensor; The maximum point of each time-frequency curve is obtained, and the horizontal coordinates corresponding to the maximum point are sorted in ascending order of time to obtain each time-frequency response data sequence.

3. A platen state monitoring method based on Hall effect as claimed in claim 2, characterized in that: The method for obtaining the response data set is: The first-order difference sequence of each time-frequency response data sequence is obtained, the median of the first-order difference sequence is used as the division threshold, the elements corresponding to the first-order differences greater than the division threshold in the time-frequency response data sequence are used as the division time points, the time-frequency curve is divided according to the division time points, and the sets of each data on the divided time-frequency curve are used as each response data set.

4. A platen state monitoring method based on Hall effect as claimed in claim 1, characterized in that: The interference response data sequence is a sequence composed of interference response values ​​of all response data sets of each Hall sensor.

5. A platen state monitoring method based on Hall effect as claimed in claim 1, characterized in that: The method for obtaining the response gain parameter is: The sum of the response interference difference values ​​of all the Hall sensors is calculated, and the ratio of the response interference difference value of each Hall sensor to the sum is calculated as the response gain parameter of each Hall sensor.

6. A platen state monitoring method based on Hall effect as claimed in claim 1, characterized in that: The method for obtaining the response value is: For each acquisition moment, the product of the magnetic field strength value of each Hall sensor and the response gain parameter is calculated, and the sum of the products of all Hall sensors is used as the response value of the array Hall sensor to the pressure plate state monitoring at each acquisition moment.

7. A platen state monitoring method based on Hall effect as claimed in claim 1, characterized in that: The method for obtaining the state monitoring threshold is: For all acquisition moments when the pressure plate is in the closed and open states during the pressure plate status monitoring process, the minimum and maximum values ​​of the magnetic field strength are obtained, the ratio of the difference between the minimum and maximum values ​​and the number 2 is calculated, and the sum of the maximum value and the ratio result is used as the status monitoring threshold.

8. A platen state monitoring method based on Hall effect as claimed in claim 1, characterized in that: The monitoring of the state of the pressing plate based on the relationship between the response value and the state monitoring threshold value includes: If the calculated response value of the array Hall sensor to the pressure plate state monitoring is greater than the state monitoring threshold, it means that the pressure plate is in a closed state; if the calculated response value of the array Hall sensor to the pressure plate state monitoring is less than or equal to the state monitoring threshold, it means that the pressure plate is in an open state.

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