A platform door multi-parameter isolation monitoring method and system

Abstract

The present application relates to the technical field of intelligent operation and maintenance of rail transit platform door, and provides a platform door multi-parameter isolation monitoring method and system, which comprises: lossless acquisition and processing of multiple different dimension signals of the platform door; transmission of the multiple different dimension signals after acquisition and processing, uploading to an edge computing terminal; analysis and processing of the uploaded multiple different dimension signals by the edge computing terminal, acquisition of the key state of the corresponding equipment, realization of equipment health degree evaluation and early fault diagnosis and early warning. The present application realizes lossless acquisition and processing of multiple different dimension signals of the platform door, analysis and processing of the multiple different dimension signals, acquisition of the key state of the corresponding equipment, realization of equipment health degree evaluation and early fault diagnosis and early warning, and can realize multi-parameter, real-time and isolated data acquisition and intelligent analysis without affecting the operation of the existing equipment.

Description

Technical Field

[0001] This invention relates to the field of intelligent operation and maintenance technology for rail transit platform screen doors, and more specifically, to a multi-parameter isolation monitoring method and system for platform screen doors. Background Technology

[0002] Statistics show that platform screen door malfunctions account for 15.7% of all rail transit malfunctions, with 42.3% of these malfunctions caused by untimely monitoring. Problems with the existing monitoring system have severely hampered the efficiency and safety of rail transit platform screen door operation and maintenance.

[0003] Currently, the monitoring of platform screen doors in rail transit mainly relies on manual inspections or fixed sensors, which presents the following significant problems.

[0004] 1. Complex installation and high modification costs: Existing monitoring equipment usually requires power outage modification of the platform screen door system, involving cable cutting, interface rewiring, etc., which not only affects the normal operation of the platform screen door, but also increases the modification cost and time.

[0005] 2. Limited data and insufficient monitoring dimensions: Existing monitoring systems can usually only collect a single parameter (such as current or displacement), which cannot fully reflect the operating status of the platform screen doors.

[0006] 3. Inability to perform real-time analysis and delayed response: Traditional monitoring systems mostly use data storage and analysis methods, which lack real-time analysis capabilities, have long fault response times, and are difficult to meet the safety operation requirements of rail transit.

[0007] 4. Significant impact on existing systems: The installation of existing monitoring equipment often requires modifications to the original system, which may damage the original system's functions and affect the safe operation of the platform screen doors.

[0008] 5. Inability to adapt to multiple manufacturers and models of platform screen doors: Due to the inconsistent DCU interface standards of different manufacturers' platform screen doors, the system deployment cost is high and the cycle is long.

[0009] Therefore, it is necessary to develop a multi-parameter isolation monitoring method and system for platform screen doors that can achieve multi-parameter, real-time, isolated data acquisition and intelligent analysis without affecting the operation of existing equipment. This method is based on non-destructive access and edge computing. Summary of the Invention

[0010] To address the problems existing in the background technology, the present invention provides a multi-parameter isolation monitoring method and system for platform screen doors, the specific technical solution of which is as follows: A method for multi-parameter isolation monitoring of platform screen doors, comprising the following steps: Lossless acquisition and processing of signals from multiple dimensions of the platform screen door; The collected and processed signals from multiple dimensions are transmitted and uploaded to the edge computing terminal. By analyzing and processing multiple signals from different dimensions uploaded through edge computing terminals, the key status of the corresponding devices can be obtained, enabling device health assessment and early fault diagnosis and warning.

[0011] The aforementioned multi-parameter isolation monitoring method for platform screen doors acquires and processes signals from multiple dimensions of the platform screen door without damage, and analyzes and processes these signals to obtain the key status of the corresponding equipment. This enables equipment health assessment and early fault diagnosis and warning. It can achieve multi-parameter, real-time, and isolated data acquisition and intelligent analysis without affecting the operation of existing equipment. It is particularly suitable for urban rail transit platform screen door systems, and can perform comprehensive status monitoring of key components such as motors, electromagnetic locks, and belts of the platform screen door, providing technical support for equipment health assessment and predictive maintenance.

[0012] Preferably, the specific method for lossless acquisition and processing of multiple signals from different dimensions of the platform screen door includes the following steps: The platform screen door uses a dedicated adapter cable to collect signals from multiple dimensions without loss, and uses optical isolation devices to isolate the signals to ensure that the original system is not interfered with during the signal acquisition process. Among them, the optocoupler isolation device is based on the optocoupler isolation transfer function, which is constructed by compensating for the inherent nonlinear characteristics of the optocoupler and for high-frequency interference compensation to suppress transient noise caused by the strong electromagnetic environment of rail transit, to isolate and transmit signals.

[0013] Preferably, the specific method for acquiring and processing multiple signals from different dimensions of the platform screen door further includes the following steps: Ensure that all signal acquisition channels are triggered synchronously by the same clock source to achieve time alignment.

[0014] Preferably, the specific method to ensure that all signal acquisition channels are synchronously triggered by the same clock source includes the following steps: Obtain the reference time base, the instantaneous frequency change rate of each channel signal, and the actual sampling time of each acquisition channel; The frequency change sensitivity term is obtained based on the instantaneous frequency change rate of each channel signal to give higher compensation weight to high-frequency changing signals; The hardware synchronization error term is obtained based on the reference time base and the actual sampling time to constrain the absolute deviation between the sampling time of each channel and the reference clock. A clock drift compensation function is constructed based on the frequency change sensitivity term and the hardware synchronization error term. The total synchronization error is obtained based on the clock drift compensation function, and all signal acquisition channels are synchronously triggered based on the total synchronization error.

[0015] Preferably, the specific method for obtaining the key status of the corresponding device includes the following steps: The three-phase current of the motor is processed to obtain the Q-axis current component and the D-axis current component, and the theoretical torque of the motor is obtained based on the Q-axis current component and the D-axis current component. The theoretical and measured speeds of the motor are obtained. The speed error is obtained based on the theoretical and measured speeds. The theoretical torque of the motor is compensated based on the speed error, and the instantaneous torque of the motor output shaft is obtained.

[0016] Preferably, the specific method for achieving equipment health assessment and early fault diagnosis and warning includes the following steps: Obtain the motor rotation angle, motor angular acceleration, and moment of inertia. Based on the motor angular acceleration and moment of inertia, obtain the acceleration term to reflect the dynamic load. Then, perform directional friction compensation on the acceleration term based on the motor rotation angle to construct a rigid body dynamics model. Harmonic features of the three-phase current of the motor are extracted, and the rigid body dynamics model is compensated based on the extracted current harmonic features to obtain the equivalent tension of the motor belt. The motor belt slippage is then determined based on the equivalent tension of the motor belt.

[0017] A platform screen door multi-parameter isolation monitoring system is provided to implement the aforementioned platform screen door multi-parameter isolation monitoring method, comprising: The signal acquisition layer is used to acquire and process signals from multiple dimensions of the platform screen door. The signal transmission layer is used to transmit multiple signals of different dimensions after acquisition and processing, and upload them to the edge computing terminal; The application layer is used to analyze and process multiple signals from different dimensions uploaded through edge computing terminals, obtain the key status of the corresponding devices, and realize device health assessment and early fault diagnosis and warning.

[0018] Preferably, the signal acquisition layer includes: A dedicated adapter cable is used to collect signals from multiple dimensions of the platform screen door without loss. Optical isolation devices are used to isolate signals to ensure that the original system is not interfered with during signal acquisition; Among them, the optocoupler isolation device is based on the optocoupler isolation transfer function, which is constructed by compensating for the inherent nonlinear characteristics of the optocoupler and for high-frequency interference compensation to suppress transient noise caused by the strong electromagnetic environment of rail transit, to isolate and transmit signals.

[0019] Preferably, the platform screen door multi-parameter isolation monitoring system further includes a clock synchronization module, which ensures that all signal acquisition channels are synchronously triggered by the same clock source to achieve time alignment.

[0020] Preferably, the clock synchronization module includes: The clock parameter acquisition unit is used to acquire the reference time base, the instantaneous frequency change rate of each channel signal, and the actual sampling time of each acquisition channel; The change-sensitive term acquisition unit is used to acquire frequency change-sensitive terms for assigning higher compensation weights to high-frequency changing signals based on the instantaneous frequency change rate of each channel signal. The synchronization error term acquisition unit is used to acquire the hardware synchronization error term, which is used to constrain the absolute deviation between the sampling time of each channel and the reference clock, based on the reference time base and the actual sampling time. The total synchronization error acquisition unit is used to construct a clock drift compensation function based on the frequency change sensitivity term and the hardware synchronization error term, obtain the total synchronization error based on the clock drift compensation function, and synchronously trigger all signal acquisition channels based on the total synchronization error. Attached Figure Description

[0021] The invention will be further understood from the following description taken in conjunction with the accompanying drawings. The components in the drawings are not necessarily drawn to scale, but rather the emphasis is on illustrating the principles of the embodiments. In different views, the same reference numerals designate corresponding parts.

[0022] Figure 1 This is a schematic diagram of the overall process of a multi-parameter isolation monitoring method for platform screen doors according to an embodiment of the present invention; Figure 2 This is a flowchart illustrating a specific method for ensuring that all signal acquisition channels are synchronously triggered by the same clock source in one embodiment of the present invention; Figure 3 This is a flowchart illustrating a specific method for obtaining the key states of a corresponding device according to an embodiment of the present invention; Figure 4 This is a flowchart illustrating a specific method for achieving equipment health assessment and early fault diagnosis and warning in one embodiment of the present invention. Figure 5 This is a schematic diagram of the overall structure of a platform screen door multi-parameter isolation monitoring system according to an embodiment of the present invention: Figure 6 This is a schematic diagram of a DC 110V to 24V circuit in one embodiment of the present invention; Figure 7 This is a schematic diagram of a DC 24V to 12V circuit in one embodiment of the present invention; Figure 8 This is a schematic diagram of a DC 24V to 5V circuit in one embodiment of the present invention; Figure 9 This is a schematic diagram of a DC 5V to 3.3V circuit in one embodiment of the present invention; Figure 10 This is a circuit diagram of the main control MCU in one embodiment of the present invention; Figure 11 This is a circuit diagram of a current acquisition circuit in one embodiment of the present invention; Figure 12 This is a circuit diagram of a motor Hall signal acquisition circuit in one embodiment of the present invention; Figure 13 This is a circuit diagram of the DCU IO signal acquisition circuit in one embodiment of the present invention; Figure 14 This is a circuit diagram of a sensor data acquisition circuit in one embodiment of the present invention; Figure 15 This is a circuit diagram of a data reporting circuit in one embodiment of the present invention. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to its embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the scope of protection of the invention.

[0024] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0025] Unless otherwise defined, 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 pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0026] In this invention, "first" and "second" do not represent a specific quantity or order, but are merely used to distinguish names.

[0027] like Figure 1 As shown, an embodiment of the present invention provides a multi-parameter isolation monitoring method for platform screen doors, comprising the following steps: S1 performs lossless acquisition and processing of signals from multiple dimensions of the platform screen door.

[0028] This embodiment provides a non-destructive access solution for the DCU (Door Control Unit) interface. It connects to the existing DCU motor, electromagnetic lock, I / O input wiring harness plugs on the platform via a dedicated adapter cable. Data acquisition is performed using an isolated signal acquisition circuit (such as the HCPL-7840 optocoupler isolation device), without affecting the original equipment function. This achieves monitoring without changing the original system, interfering with the original equipment, or increasing additional costs, thus solving the industry pain point that traditional monitoring equipment requires power outage modification and affects the normal operation of the platform door.

[0029] For analog quantities such as motor three-phase current and electromagnetic lock current, a unified circuit topology of "isolation operational amplifier + ADC sampling + programmable gain conditioning" is adopted; for digital quantities such as Hall pulses and IO status, a unified design of "high-speed optocoupler isolation + Schmitt trigger shaping" is adopted.

[0030] As a preferred technical solution, the specific method for non-destructive acquisition and processing of multiple signals from different dimensions of platform screen doors includes the following steps: non-destructive acquisition of multiple signals from different dimensions of platform screen doors is performed through a dedicated adapter cable, and signal isolation is performed using an optocoupler isolation device to ensure that the signal acquisition process does not interfere with the original system; wherein, the optocoupler isolation device is based on the optocoupler isolation transfer function constructed by compensating for the inherent nonlinear characteristics of optocouplers and for high-frequency interference compensation to suppress transient noise caused by the strong electromagnetic environment of rail transit, for signal isolation and transmission.

[0031] For example, the optical isolation transfer function is expressed as ;in, These represent the nonlinear saturation compensation term and the high-frequency interference compensation term, respectively. This represents the input current of the optocoupler, and K is the dynamic linear gain. These represent the nonlinear saturation coefficient and the high-frequency interference compensation coefficient, respectively. This represents the rate of change of input current, which reflects transient noise caused by electromagnetic interference.

[0032] Specifically, the dynamic linear gain can be adjusted in real time by the programmable gain conditioning circuit (PGA204), the nonlinear saturation coefficient is determined by the temperature characteristics of the optocoupler CTR (current transfer ratio), and the high-frequency interference compensation coefficient is realized by the RC differentiating circuit.

[0033] In the nonlinear saturation compensation term, when the optocoupler input current → 0, the overall structure exhibits a small-signal linear region, degenerating into a nonlinear state. When the input current of the optocoupler approaches ±∞, the output voltage of the optocoupler... This enables saturation region limiting protection. Therefore, the nonlinear saturation compensation term accurately describes the S-shaped transmission curve of the HCPL-7840, solving the distortion problem of the traditional linear model in the high and low current regions.

[0034] In the high-frequency interference compensation term, when the input current change rate is >104 A / s (i.e., EMI pulse), this term outputs a reverse compensation voltage. Therefore, this high-frequency interference compensation term is mainly used to suppress transient noise caused by strong electromagnetic environments in rail transit (such as trains entering stations).

[0035] The optocoupler isolation transfer function can be embedded in the firmware of the main control MCU STM32F103RCT6, with a sampling period of 100μs per channel, and outputs the compensated optocoupler output voltage in real time. Provided for edge computing layer analysis.

[0036] S2 transmits the collected and processed signals from multiple dimensions to the edge computing terminal.

[0037] As a preferred technical solution, the specific method for collecting and processing signals from multiple dimensions of the platform screen door also includes the following steps: ensuring that all signal acquisition channels are synchronously triggered by the same clock source to achieve time alignment.

[0038] All channels are synchronously triggered by the same clock source to achieve microsecond-level time alignment of signals across analog and digital domains, enabling safe, synchronous, and high-fidelity acquisition of high-voltage and low-voltage, analog and digital signals.

[0039] Here, the Modbus RTU communication protocol can be used to realize multi-device data acquisition and transmission via the 485 bus. Combined with edge computing, data compression and filtering can be performed to reduce the amount of data transmitted and improve data transmission efficiency and reliability. It is suitable for the communication needs of the complex electromagnetic environment of the platform door.

[0040] S3 analyzes and processes multiple signals from different dimensions uploaded through an edge computing terminal to obtain the key status of the corresponding devices, thereby enabling device health assessment and early fault diagnosis and warning.

[0041] Specifically, edge computing terminals utilize synchronously collected multi-parameter data (current, position, I / O, etc.) to run a model that integrates physical mechanisms and data-driven processes in real time locally. This model then reverse-engineers (reconstructs) key states that cannot be directly measured, such as instantaneous motor torque, electromagnetic lock armature displacement, and belt equivalent tension. When the monitored values ​​deviate from the reconstructed model, the source of the anomaly can be quickly located.

[0042] In addition, edge computing terminals can also be used to dynamically generate and update threshold ranges based on statistical process control (SPC) according to the historical normal operation data of the device, so as to abandon fixed alarm thresholds and enable the system to have adaptive learning capabilities.

[0043] In this way, the monitoring dimension can be extended from "directly measurable parameters" to "indirect critical states", realizing equipment health assessment and early fault warning, improving the accuracy of fault identification, breaking through the limitation of traditional monitoring that "only measures but does not diagnose", and realizing the leap from "data monitoring" to "state diagnosis". Through historical data comparison, fault trend prediction can also be realized, and early warning can be given.

[0044] The described multi-parameter isolated monitoring method for platform screen doors non-destructively acquires and processes signals from multiple dimensions of the platform screen door, and analyzes these signals to obtain the key status of the corresponding equipment. This enables equipment health assessment and early fault diagnosis and warning. It achieves multi-parameter, real-time, and isolated data acquisition and intelligent analysis without affecting the operation of existing equipment. It is particularly suitable for urban rail transit platform screen door systems, enabling comprehensive status monitoring of key components such as motors, electromagnetic locks, and belts, providing technical support for equipment health assessment and predictive maintenance. In one embodiment, such as Figure 2 As shown, the specific method to ensure that all signal acquisition channels are synchronously triggered by the same clock source includes the following steps: S21, Obtain the reference time base Instantaneous frequency change rate of each channel signal and the actual sampling time of each acquisition channel .

[0045] S22, obtain the frequency change sensitive term for assigning higher compensation weight to high-frequency changing signals based on the instantaneous frequency change rate of each channel signal. .

[0046] S23, Based on the reference time base and the actual sampling time, obtain the hardware synchronization error term used to constrain the absolute deviation between the sampling time of each channel and the reference clock. .

[0047] S24. Construct a clock drift compensation function based on the frequency change sensitivity term and the hardware synchronization error term, obtain the total synchronization error based on the clock drift compensation function, and synchronously trigger all signal acquisition channels based on the total synchronization error.

[0048] For example, the clock drift compensation function is expressed as: .in, This represents the total synchronization error, i.e., the time deviation that needs to be compensated. k is the acquisition channel index. These represent the channel weighting coefficient and the instantaneous frequency of the channel k signal, respectively, with the current signal having a greater weight than the state signal. This represents the hardware synchronization penalty factor, which is generally between 0.05 and 0.2, with higher values ​​used for low stability.

[0049] Specifically, signals such as the three-phase current and Hall pulses of the platform screen door motor require strict time alignment, but in reality, there are issues such as hardware delay differences (inconsistent ADC conversion times), dynamic changes in signal frequency, and clock source drift. Among the frequency change sensitive items, the channel weight coefficient is positively correlated with the signal bandwidth, which can assign higher compensation weight to high-frequency changing signals. For example, when the motor current changes abruptly, the channel weight coefficient automatically increases, improving the synchronization accuracy during the motor startup phase.

[0050] In the hardware synchronization error term, the hardware synchronization penalty factor is determined by clock stability. It can be dynamically adjusted in the STM32 interrupt service routine to constrain the absolute deviation between the sampling time of each channel and the reference clock, so as to eliminate the fixed delay difference caused by PCB routing.

[0051] The channel weighting coefficient can be set by injecting a step current signal and setting the corresponding weight value according to the channel response speed.

[0052] In summary, by enabling the clock drift compensation function to run in real time within the STM32 interrupt at a frequency of 10kHz, time synchronization compensation can be ensured before state reconstruction at the edge computing layer, providing a high-precision data foundation for calculating key parameters such as motor torque and belt tension.

[0053] In one embodiment, such as Figure 3 As shown, the specific method for obtaining the key status of the corresponding device includes the following steps: S31 processes the three-phase current of the motor to obtain the Q-axis current component. and D-axis current component The theoretical torque of the motor is obtained based on the Q-axis current component and the D-axis current component. .

[0054] S32, obtain the theoretical speed of the motor. and measured speed The speed error is obtained based on the theoretical speed and the measured speed. The theoretical torque of the motor is compensated based on the speed error to obtain the instantaneous torque of the motor output shaft.

[0055] For example, the instantaneous torque of the motor output shaft Where P is the number of pole pairs of the motor, typically 4-8 pairs. These represent the d-axis flux linkage (direct-axis flux) and q-axis flux linkage (quadrature-axis flux), respectively. The d-axis flux linkage reflects the magnetic field strength of the permanent magnet and can be estimated in real time using an LSTM network. The q-axis flux linkage reflects the electromagnetic field interaction strength and can also be estimated in real time using an LSTM network. The Q-axis current component determines the magnitude of the electromagnetic torque, and the D-axis current component controls the magnetic field strength of the motor. This represents the adaptive observer gain, used to dynamically compensate for model errors.

[0056] The accuracy of the motor's theoretical torque depends on Accuracy, and It is subject to temperature / aging drift and ignores mechanical losses (bearing friction, belt slippage), which has certain limitations. By compensating for the theoretical torque of the motor through speed error, deviations in the physical model can be dynamically corrected.

[0057] Preferably, the adaptive observer gain is adaptively adjusted according to the rotational speed error. The larger the rotational speed error, the closer the adaptive observer gain is to 0.9 for strong compensation; the smaller the rotational speed error, the closer the adaptive observer gain is to 0.5 for weak compensation. For example, .

[0058] When the instantaneous torque of the motor output shaft is less than the preset torque threshold, belt slippage can be detected and a belt slippage warning can be triggered.

[0059] Thus, based on the instantaneous torque function model of the motor output shaft, torque monitoring errors can be reduced, providing core data support for the accuracy of subsequent electromagnetic lock displacement reconstruction and belt life prediction.

[0060] In one embodiment, such as Figure 4 As shown, the specific methods for achieving equipment health assessment and early fault diagnosis and warning include the following steps: S33, obtain the motor rotation angle Angular acceleration of motor and moment of inertia Acceleration terms reflecting dynamic loads are obtained based on the motor's angular acceleration and moment of inertia. Furthermore, directional friction compensation is applied to the acceleration term based on the motor rotation angle to construct a rigid body dynamics model. .

[0061] S34, for the three-phase current of the motor Harmonic features are extracted, and the rigid body dynamics model is compensated based on the extracted current harmonic features. The equivalent tension of the motor belt is obtained, and the slippage of the motor belt is determined based on the equivalent tension of the motor belt.

[0062] For example, the equivalent tension of the motor belt Where r represents the radius of the pulley. This represents the Coulomb friction coefficient, which reflects the wear condition of the bearing. This is a sign function used to resolve friction differences in the start and stop directions. This is the harmonic compensation coefficient, used to adjust the belt slippage sensitivity. This can be understood as the three-phase current of the motor. Current harmonic extraction is performed to extract belt slippage characteristics.

[0063] Generally speaking, rigid body dynamics model Assuming the belt has no elastic deformation, it cannot detect microscopic slippage, which has certain limitations. For a healthy belt, the motor current harmonics are mainly of the 5th and 7th orders; when the belt slips, the 3rd harmonic suddenly increases. Therefore, Its function is to capture micro-slippage and localized damage to the belt through the characteristics of current harmonics.

[0064] Regarding the harmonic compensation coefficient, since the belt elastic modulus decreases at high motor temperatures, it can be adaptively adjusted based on the motor temperature T. For example, To enhance harmonic weighting at high temperatures. This represents the reference value for the harmonic compensation coefficient, which can be set based on experience.

[0065] When the equivalent tension of the motor belt is less than the preset tension threshold, it can be determined that the motor belt is slipping.

[0066] like Figure 5 As shown, an embodiment of the present invention also provides a platform door multi-parameter isolation monitoring system for implementing the platform door multi-parameter isolation monitoring method, which includes a signal acquisition layer, a signal transmission layer and an application layer.

[0067] The signal acquisition layer is used to acquire and process signals from multiple dimensions of the platform screen door; the signal transmission layer is used to transmit the acquired and processed signals from multiple dimensions to the edge computing terminal; the application layer is used to analyze and process the uploaded signals from multiple dimensions through the edge computing terminal, obtain the key status of the corresponding equipment, and realize equipment health assessment and early fault diagnosis and warning.

[0068] Specifically, each layer is connected via clearly defined electrical and communication interfaces, allowing for independent development, testing, and replacement, thus decoupling hardware acquisition from software algorithms. The signal acquisition layer corresponds to... Figure 5 The system comprises a perception layer and a computing layer, a signal transmission layer corresponding to the multi-protocol communication transmission layer, and an application layer including the edge computing terminal. Between the application layer and the transmission layer, an intelligent operation and maintenance unit can be set up to provide optimization suggestions and adaptive early warnings. Alternatively, the intelligent operation and maintenance unit can be integrated into the application layer and configured within the edge computing terminal.

[0069] This invention also provides an isolated independent power supply design, which adopts a multi-level isolated power supply architecture and multiple independent GND system designs. Through the multi-level isolated power supply and multiple independent GND system, complete electrical isolation between power supply, signal and ground is achieved, solving ground loop interference and eliminating signal distortion caused by ground potential difference in traditional systems.

[0070] With a power isolation voltage of up to 2500V, it meets the safety standards for rail transit equipment, enabling the system to maintain high-precision and high-reliability monitoring capabilities even in complex electromagnetic environments. This achieves the key to "non-destructive access" technology, providing a reliable power foundation for non-destructive access to the DCU interface and ensuring that the original equipment functions are not affected.

[0071] The isolated power supply architecture is shown in Table 1, and the detailed design of multiple independent GNDs is shown in Table 2.

[0072] Table 1 Isolated Power Supply Architecture

[0073] Table 2. Independent GND Design Details

[0074] The platform screen door multi-parameter isolation monitoring system described in this embodiment also includes a data acquisition box. The data acquisition box can be made of carbon steel plate with a surface coated with anti-corrosion paint. Its compact design allows for installation using pre-reserved slots on existing gantry crane beams. Thus, through optimized structural design, "plug-and-play" portable monitoring can be achieved, solving the problems of large installation space and complex modification required by traditional monitoring equipment. It is particularly suitable for the temporary and mobile needs of platform screen door maintenance, and can also shorten installation time and improve efficiency.

[0075] like Figures 6-15 As shown, this invention also includes a highly integrated sensor data interface module that supports multiple signal types, including analog voltage / current signals and RS485, providing a unified power supply (24V / 12V / 5V) and interface standard for various sensors. This simplifies the sensor access process, improves system scalability, and avoids the complexity of designing separate interfaces for different sensors. Consequently, sensor deployment time can be shortened, and system expansion costs can be reduced.

[0076] for Figures 6-15 The specific circuit diagrams involved in circuits such as current acquisition circuits, motor Hall signal acquisition circuits, DCU IO signal acquisition circuits, and sensor data acquisition circuits are conventional techniques in this field and will not be described in detail.

[0077] As a preferred technical solution, the signal acquisition layer includes a dedicated adapter cable and an optocoupler isolation device.

[0078] A dedicated adapter cable is used to collect signals from multiple dimensions of the platform screen door without loss of quality. Specifically, the dedicated adapter cable is used to connect to the wiring harness plugs of the DCU motor, electromagnetic lock, I / O input, etc., to achieve "plug and play" lossless access.

[0079] Optical isolation devices are used for signal isolation to ensure that the original system is not interfered with during signal acquisition. Here, optical isolation devices such as HCPL-7840 and HCPL-0631 can be used.

[0080] The acquisition of three-phase motor current and electromagnetic lock current adopts an "isolation operational amplifier + precision sampling + programmable gain conditioning" circuit; the acquisition of Hall pulse and IO status adopts a "high-speed optocoupler isolation + Schmitt trigger shaping" circuit.

[0081] The application layer includes edge computing terminals, which include, but are not limited to, main control MCU, intelligent operation and maintenance unit, state reconstruction model and adaptive early warning model.

[0082] The main control MCU can be an STM32F103RCT6, used for local real-time data acquisition and preprocessing; the intelligent operation and maintenance unit uses the RK3588 high-performance processor to realize local real-time data analysis and storage; the state reconstruction model adopts a model that integrates physical mechanism and data-driven approach, used for reverse inference of key states that cannot be directly measured; and the adaptive early warning model is used for dynamic generation and updating of threshold intervals based on statistical process control (SPC).

[0083] As a preferred technical solution, the optocoupler isolation device isolates and transmits signals based on an optocoupler isolation transfer function constructed by compensating for the inherent nonlinear characteristics of the optocoupler and for high-frequency interference compensation to suppress transient noise caused by the strong electromagnetic environment of rail transit. The optocoupler isolation transfer function is expressed as follows: ;in, These represent the nonlinear saturation compensation term and the high-frequency interference compensation term, respectively. This represents the input current of the optocoupler, and K is the dynamic linear gain. These represent the nonlinear saturation coefficient and the high-frequency interference compensation coefficient, respectively. This represents the rate of change of the input current.

[0084] The platform screen door multi-parameter isolation monitoring system also includes a clock synchronization module. This module ensures that all signal acquisition channels are triggered synchronously by the same clock source to achieve time alignment. For example, all signal acquisition channels can be triggered uniformly by the timer of an STM32F103RCT6 to achieve microsecond-level time alignment. As a preferred technical solution, the clock synchronization module includes a clock parameter acquisition unit, a change-sensitive item acquisition unit, a synchronization error item acquisition unit, and a total synchronization error acquisition unit.

[0085] The clock parameter acquisition unit is used to acquire the reference time base, the instantaneous frequency change rate of each channel signal, and the actual sampling time of each acquisition channel; the change sensitivity acquisition unit is used to acquire the frequency change sensitivity term for assigning higher compensation weight to high-frequency changing signals based on the instantaneous frequency change rate of each channel signal.

[0086] The synchronization error term acquisition unit is used to acquire the hardware synchronization error term, which is used to constrain the absolute deviation between the sampling time of each channel and the reference clock, based on the reference time base and the actual sampling time. The total synchronization error acquisition unit is used to construct a clock drift compensation function based on the frequency change sensitivity term and the hardware synchronization error term, acquire the total synchronization error based on the clock drift compensation function, and synchronously trigger all signal acquisition channels based on the total synchronization error.

[0087] For example, the clock drift compensation function is expressed as: .in, This represents the total synchronization error.

[0088] In summary, the platform screen door multi-parameter isolation monitoring system acquires and processes signals from multiple dimensions of the platform screen door without loss, and analyzes these signals to obtain the key status of the corresponding equipment. This enables equipment health assessment and early fault diagnosis and warning. It can achieve multi-parameter, real-time, and isolated data acquisition and intelligent analysis without affecting the operation of existing equipment. It is particularly suitable for urban rail transit platform screen door systems, enabling comprehensive status monitoring of key components such as motors, electromagnetic locks, and belts, providing technical support for equipment health assessment and predictive maintenance.

[0089] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0090] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A method for multi-parameter isolation monitoring of platform screen doors, characterized in that, The multi-parameter isolation monitoring method for platform screen doors includes: Lossless acquisition and processing of signals from multiple dimensions of the platform screen door; The collected and processed signals from multiple dimensions are transmitted and uploaded to the edge computing terminal. By analyzing and processing multiple signals from different dimensions uploaded through edge computing terminals, the key status of the corresponding devices can be obtained, enabling device health assessment and early fault diagnosis and warning.

2. The multi-parameter isolation monitoring method for platform screen doors as described in claim 1, characterized in that, The specific method for acquiring and processing signals from multiple dimensions of the platform screen door includes the following steps: The platform screen door uses a dedicated adapter cable to collect signals from multiple dimensions without loss, and uses optical isolation devices to isolate the signals to ensure that the original system is not interfered with during the signal acquisition process. Among them, the optocoupler isolation device is based on the optocoupler isolation transfer function, which is constructed by compensating for the inherent nonlinear characteristics of the optocoupler and for high-frequency interference compensation to suppress transient noise caused by the strong electromagnetic environment of rail transit, to isolate and transmit signals.

3. The multi-parameter isolation monitoring method for platform screen doors as described in claim 2, characterized in that, The specific method for acquiring and processing signals from multiple dimensions of the platform screen door also includes the following steps: Ensure that all signal acquisition channels are triggered synchronously by the same clock source to achieve time alignment.

4. The multi-parameter isolation monitoring method for platform screen doors as described in claim 3, characterized in that, The specific method to ensure that all signal acquisition channels are synchronously triggered by the same clock source includes the following steps: Obtain the reference time base, the instantaneous frequency change rate of each channel signal, and the actual sampling time of each acquisition channel; The frequency change sensitivity term is obtained based on the instantaneous frequency change rate of each channel signal to give higher compensation weight to high-frequency changing signals; The hardware synchronization error term is obtained based on the reference time base and the actual sampling time to constrain the absolute deviation between the sampling time of each channel and the reference clock. A clock drift compensation function is constructed based on the frequency change sensitivity term and the hardware synchronization error term. The total synchronization error is obtained based on the clock drift compensation function, and all signal acquisition channels are synchronously triggered based on the total synchronization error.

5. The multi-parameter isolation monitoring method for platform screen doors as described in claim 4, characterized in that, The specific methods for obtaining the critical status of the corresponding device include the following steps: The three-phase current of the motor is processed to obtain the Q-axis current component and the D-axis current component, and the theoretical torque of the motor is obtained based on the Q-axis current component and the D-axis current component. The theoretical and measured speeds of the motor are obtained. The speed error is obtained based on the theoretical and measured speeds. The theoretical torque of the motor is compensated based on the speed error, and the instantaneous torque of the motor output shaft is obtained.

6. The multi-parameter isolation monitoring method for platform screen doors as described in claim 5, characterized in that, The specific methods for achieving equipment health assessment and early fault diagnosis and warning include the following steps: Obtain the motor rotation angle, motor angular acceleration, and moment of inertia. Based on the motor angular acceleration and moment of inertia, obtain the acceleration term to reflect the dynamic load. Then, perform directional friction compensation on the acceleration term based on the motor rotation angle to construct a rigid body dynamics model. Harmonic features of the three-phase current of the motor are extracted, and the rigid body dynamics model is compensated based on the extracted current harmonic features to obtain the equivalent tension of the motor belt. The motor belt slippage is then determined based on the equivalent tension of the motor belt.

7. A platform screen door multi-parameter isolation monitoring system, used to implement the platform screen door multi-parameter isolation monitoring method as described in any one of claims 1-6, characterized in that, The platform screen door multi-parameter isolation monitoring system includes: The signal acquisition layer is used to acquire and process signals from multiple dimensions of the platform screen door. The signal transmission layer is used to transmit multiple signals of different dimensions after acquisition and processing, and upload them to the edge computing terminal; The application layer is used to analyze and process multiple signals from different dimensions uploaded through edge computing terminals, obtain the key status of the corresponding devices, and realize device health assessment and early fault diagnosis and warning.

8. The platform screen door multi-parameter isolation monitoring system as described in claim 7, characterized in that, The signal acquisition layer includes: A dedicated adapter cable is used to collect signals from multiple dimensions of the platform screen door without loss. Optical isolation devices are used to isolate signals to ensure that the original system is not interfered with during signal acquisition; Among them, the optocoupler isolation device is based on the optocoupler isolation transfer function, which is constructed by compensating for the inherent nonlinear characteristics of the optocoupler and for high-frequency interference compensation to suppress transient noise caused by the strong electromagnetic environment of rail transit, to isolate and transmit signals.

9. The platform screen door multi-parameter isolation monitoring system as described in claim 8, characterized in that, The platform screen door multi-parameter isolation monitoring system also includes a clock synchronization module, which ensures that all signal acquisition channels are triggered synchronously by the same clock source to achieve time alignment.

10. The platform screen door multi-parameter isolation monitoring system as described in claim 9, characterized in that, The clock synchronization module includes: The clock parameter acquisition unit is used to acquire the reference time base, the instantaneous frequency change rate of each channel signal, and the actual sampling time of each acquisition channel. The change-sensitive term acquisition unit is used to acquire frequency change-sensitive terms for assigning higher compensation weights to high-frequency changing signals based on the instantaneous frequency change rate of each channel signal. The synchronization error term acquisition unit is used to acquire the hardware synchronization error term, which is used to constrain the absolute deviation between the sampling time of each channel and the reference clock, based on the reference time base and the actual sampling time. The total synchronization error acquisition unit is used to construct a clock drift compensation function based on the frequency change sensitivity term and the hardware synchronization error term, obtain the total synchronization error based on the clock drift compensation function, and synchronously trigger all signal acquisition channels based on the total synchronization error.

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