Platform door safety circuit detection system and method

Abstract

The invention relates to the technical field of rail transit platform door safety circuit detection, in particular to a platform door safety circuit detection system and method. Each platform door corresponds to a data acquisition and processing control panel, a dynamic input interface circuit, a data acquisition module and a data processing module are integrated on the data acquisition and processing control panel, the dynamic input interface circuit comprises a photoelectric coupler O1 and a photoelectric coupler O2, and an input stage of the photoelectric coupler O1 is connected with an output stage of the photoelectric coupler O2 in series. And the data acquisition and processing control panel periodically sends a pulse sequence to the input stage of the photoelectric coupler O2, receives a signal fed back by the photoelectric coupler O1, and judges the validity of the input signal by checking the integrity and reversibility of the pulse sequence. Through signal bidirectional verification and fault safety guiding design, the problems that in platform door safety circuit detection, contacts adhere, signal distortion cannot be recognized and the like are solved, and the reliability of a platform door safety circuit is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of rail transit platform door safety circuit detection, and in particular to a platform door safety circuit detection system and method. Background Art

[0002] In rail transit systems, platform doors are crucial for passenger safety and train operation, and the reliability of their safety circuits is crucial. These circuits monitor various platform door states, such as whether they are open, closed, or locked. A fault in these circuits could prevent the platform doors from opening and closing properly, potentially impacting train safety.

[0003] At present, the signal transmission of the safety interlock circuit in the rail transit platform door system generally adopts level signal or pulse signal. Figure 4 , pulse signal see Figure 5 The basic principle is similar, differing only in the duration of the high-level signal. Once at the PSC cabinet, a safety relay receives the signal and outputs it to the upstream and downstream terminals. However, existing solutions have the following drawbacks: The safety relay contacts are prone to sticking, resulting in a continuous safety circuit and an inability to accurately reflect the platform door status; and traditional open-loop signal detection methods cannot effectively identify signal distortion or circuit faults, posing a safety hazard. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: In order to overcome the above technical problems, the present invention provides a platform door safety circuit detection system and method, which ensures the reliability of the platform door safety circuit through signal bidirectional verification and fault safety guidance design, can accurately and quickly detect platform door safety circuit failures, and can effectively analyze and manage the detection data to improve the safety and reliability of platform door operation.

[0005] The present invention solves its technical problems by adopting a technical solution: a platform door safety circuit detection system, wherein each platform door corresponds to a data acquisition and processing control board, the data acquisition and processing control board integrating a dynamic input interface circuit, a data acquisition module, and a data processing module. The dynamic input interface circuit adopts a closed-loop pulse detection structure and includes a photocoupler O1 and a photocoupler O2 connected in series. The input stage of the photocoupler O1 is connected in series with the output stage of the photocoupler O2, and the input stage of the photocoupler O2 is controlled by the output port of the data acquisition and processing control board. The output port of the photocoupler O1 is connected to the input port of the data acquisition and processing control board. The data acquisition module includes multiple sensors for real-time acquisition of electrical parameters of the safety circuit and transmits the acquired data to the data processing module. The data processing module receives data from the data acquisition module and pre-processes the data. The data acquisition and processing control board periodically sends a pulse sequence to the input stage of the photocoupler O2, and the data acquisition and processing control board receives the signal fed back by the photocoupler O1. The data acquisition and processing control board contains a CPU, which verifies the integrity and reversibility of the pulse sequence and determines the validity of the input signal.

[0006] The electrical parameters collected in real time by the data acquisition module include voltage and current.

[0007] The pre-processing includes filtering, amplification and digitization.

[0008] The data collected by the data collection module is transmitted to the data processing module via wired communication.

[0009] A platform door safety circuit detection method includes the following steps:

[0010] Each platform door is provided with a corresponding data acquisition and processing control board, which integrates a dynamic input interface circuit, a data acquisition module and a data processing module;

[0011] A closed-loop pulse detection structure is used to implement a dynamic input interface circuit, and the dynamic input interface circuit includes a photocoupler O1 and a photocoupler O2. The input stage of the photocoupler O1 is connected in series with the output stage of the photocoupler O2. The input stage of the photocoupler O2 is controlled on and off by the output port of the data acquisition and processing control board. The output port of the photocoupler O1 is connected to the input port of the data acquisition and processing control board.

[0012] The data acquisition module collects the electrical parameters of the safety circuit in real time through multiple sensors, and transmits the collected data to the data processing module;

[0013] The data processing module receives the data from the data acquisition module and pre-processes the data;

[0014] The data acquisition and processing control board periodically sends a pulse sequence to the input stage of the photoelectric coupler O2, and receives the signal fed back by the photoelectric coupler O1. The data acquisition and processing control board has a CPU, which determines the validity of the input signal by checking the integrity and reversibility of the pulse sequence.

[0015] When the external input signal is high, the data acquisition and processing control board sends a pulse sequence, the photoelectric coupler O2 is turned on, causing the photoelectric coupler O1 to be turned on synchronously, and the signal fed back to the data acquisition and processing control board is the reverse pulse sequence of the pulse sequence sent by the data acquisition and processing control board;

[0016] If the external input signal is at a low level or the pulse sequence is abnormal, the signal fed back to the data acquisition and processing control board will be at a stable level of 0 or 1, triggering a fault alarm.

[0017] If the external input signal is low level or the pulse sequence is abnormal, it is judged as a fault and leads to a safe state.

[0018] Two independent CPUs are used to verify the input signal. When the verification results of the two CPUs are consistent, the signal is judged to be normal; if the verification results of the two CPUs are inconsistent, it is judged to be a fault and leads to a safe state.

[0019] A fault diagnosis algorithm based on a combination of rules and models is used to verify the external input signal.

[0020] In the fault diagnosis algorithm, first, an electrical model of the safety circuit is established. Based on the collected electrical parameters of the safety circuit, the electrical model is used to predict the parameter range under normal conditions. During operation, the real-time collected data is compared with the predicted values of the electrical model and the fault rules to diagnose the type and location of the fault. When the feedback signal is at a stable level and the duration exceeds a certain threshold, it is determined to be a line circuit breaker fault. When the error rate of the pulse sequence exceeds the set ratio, it is determined to be a signal distortion fault.

[0021] The beneficial effects of the present invention are as follows: a platform door safety circuit detection system and method of the present invention, through signal bidirectional verification and fault safety guidance design, can detect the status of the platform door safety circuit in real time and accurately, quickly locate the fault point, and simultaneously analyze and store the detection data without the occurrence of contact sticking and other phenomena, effectively solving the problems of contact sticking, signal distortion and unrecognizable problems existing in the existing platform door safety circuit detection, ensuring the reliability of the platform door safety circuit, and having the following advantages:

[0022] Real-time and accurate detection: By installing sensors at the safety circuit nodes of each door, various electrical parameters can be collected in real time, the status of the safety circuit can be accurately judged, and potential faults can be discovered in a timely manner.

[0023] Fast fault location: Using advanced fault diagnosis algorithms, it can quickly locate the fault point, reduce troubleshooting time, and improve maintenance efficiency.

[0024] Effective data analysis: It can analyze and store detection data. By mining historical data, it can summarize fault patterns and provide a scientific basis for the maintenance and optimization of platform doors.

[0025] Convenient remote monitoring: Supports remote monitoring and operation, so staff can understand the operation status of the platform door safety circuit anytime and anywhere and deal with faults in a timely manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below with reference to the accompanying drawings and examples.

[0027] Figure 1 It is a system block diagram of the platform door safety circuit detection system of the present invention.

[0028] Figure 2 It is a safety circuit architecture diagram of the platform door safety circuit detection system of the present invention.

[0029] Figure 3 It is a structural diagram of the dynamic input interface circuit in the platform door safety circuit detection system of the present invention.

[0030] Figure 4 It is a schematic diagram of the level signal commonly used in signal transmission of safety interlock circuits.

[0031] Figure 5 This is a pulse signal diagram commonly used in signal transmission of safety interlock circuits. DETAILED DESCRIPTION

[0032] The present invention will now be described in further detail with reference to the accompanying drawings, which are simplified schematic diagrams that illustrate the basic structure of the present invention in a schematic manner.

[0033] Rail transit platform doors are generally equipped with multiple platform doors. Figure 2 In the example, there are 24 platform doors in total in the system, and for a clearer illustration, the middle doors 2# to 22# are omitted in the figure. In the platform door safety circuit detection system of the present invention, each platform door has a corresponding data acquisition and processing control board, such as Figure 1 As shown, the data acquisition and processing control board integrates dynamic input interface circuit, data acquisition module and data processing module. When the normally open point of a single platform door is closed, Figure 2The switch in the middle is the normally open point. The dynamic input interface circuit on the data acquisition and processing control board sends a pulse signal to the monitoring system. The dynamic input interface circuit of each platform door can achieve real-time detection and transmit the status of each platform door to the monitoring system via CAN communication. The monitoring system enables remote monitoring and operation, allowing staff to understand the operating status of the platform door anytime and anywhere and promptly address any faults.

[0034] like Figure 3 As shown, the dynamic input interface circuit adopts a closed-loop pulse detection structure, and the dynamic input interface circuit includes a photocoupler O1 and a photocoupler O2 connected in series, and the input stage of the photocoupler O1 is connected in series with the output stage of the photocoupler O2, and the input stage of the photocoupler O2 is controlled by the output port of the data acquisition and processing control board; the output port of the photocoupler O1 is connected to the input port of the data acquisition and processing control board. Figure 3 In the figure, R1, R2, R3, R4 and R5 are resistors, C1, C2 and C3 are capacitors, L is an inductor, VD1 and VD2 are diodes, and V is a voltage source. In order to reduce glitches and spikes in the collected input signal, the external input signal input between the signal input terminals Signal+ and Signal- is filtered, noise-reduced and conditioned before entering the acquisition and processing control board. Figure 3 The processor interface is the interface of the data acquisition and processing control board.

[0035] The data acquisition module includes multiple sensors for real-time acquisition of the safety circuit's electrical parameters. The collected data is then transmitted to the data processing module, which receives and pre-processes the data from the data acquisition module. The data acquisition and processing control board periodically sends pulse sequences, such as 101010, to the input stage of photoelectric coupler O2. The data acquisition and processing control board receives feedback signals from photoelectric coupler O1. The data acquisition and processing control board contains a CPU, which verifies the integrity and reversibility of the pulse sequence and determines the validity of the input signal. Photoelectric couplers O1 and O2 are connected in series to achieve electrical isolation between the input signal and the data acquisition and processing control board. The output stage of photoelectric coupler O2 is directly connected to the input stage of photoelectric coupler O1, forming a closed-loop feedback path.

[0036] The electrical parameters collected by the data acquisition module in real time include voltage and current, such as Figure 2 As shown, it is realized by voltage detection circuit and current detection circuit respectively.

[0037] The pre-processing includes filtering, amplification and digitization.

[0038] The data collected by the data collection module is transmitted to the data processing module via wired communication.

[0039] A platform door safety circuit detection method includes the following steps:

[0040] A closed-loop pulse detection structure is used to implement a dynamic input interface circuit, and the dynamic input interface circuit includes a photocoupler O1 and a photocoupler O2. The input stage of the photocoupler O1 is connected in series with the output stage of the photocoupler O2. The input stage of the photocoupler O2 is controlled on and off by the output port of the data acquisition and processing control board. The output port of the photocoupler O1 is connected to the input port of the data acquisition and processing control board.

[0041] The data acquisition module collects the electrical parameters of the safety circuit in real time through multiple sensors, and transmits the collected data to the data processing module;

[0042] The data processing module receives the data from the data acquisition module and pre-processes the data;

[0043] The data acquisition and processing control board periodically sends a pulse sequence, such as 101010, to the input stage of the photoelectric coupler O2. The data acquisition and processing control board receives the signal fed back by the photoelectric coupler O1. The data acquisition and processing control board has a CPU inside. The CPU determines the validity of the input signal by checking the integrity and reversibility of the pulse sequence.

[0044] When the external input signal input between the signal input terminals Signal+ and Signal- is at a high level, the data acquisition and processing control board sends a pulse sequence, the photoelectric coupler O2 is turned on, and the photoelectric coupler O1 is turned on synchronously. The signal fed back to the data acquisition and processing control board is the reverse pulse sequence of the pulse sequence sent by the data acquisition and processing control board. If the pulse sequence periodically sent by the data acquisition and processing control board is 101010, the reverse pulse sequence is 010101.

[0045] If the external input signal input between the signal input terminals Signal+ and Signal- is at a low level or has an abnormal pulse sequence, the abnormal pulse sequence is detected as not being a reverse pulse sequence, and the signal fed back to the data acquisition and processing control board is at a stable level of 0 or 1, triggering a fault alarm, for example, triggering a fault handling program.

[0046] The system of the present invention supports the detection of external input signals input between the signal input terminals Signal+ and Signal-, which are 50-2000ms pulse signals or long-time high and low level signals.

[0047] The CPU verifies whether the input code is distorted. If a stable level or abnormal pulse sequence is detected, it is determined to be a fault and directed to a safe state, such as prohibiting door opening, to ensure the safety of passengers and train operation.

[0048] Two independent CPUs verify input signals. If the verification results are consistent, the signal is considered normal. If they are inconsistent, a fault is detected and the system is directed to a safe state. In circuit design, fail-safe logic gates can be used to ensure fail-safe operation at the hardware level. Logic gates are a safety circuit for fail-safe operation within the dual-CPU redundancy mechanism and can be implemented using a safety relay's forced-off mode.

[0049] A fault diagnosis algorithm based on a combination of rules and models is used to verify the external input signal.

[0050] In the fault diagnosis algorithm, an electrical model of the safety circuit is first established. Based on the collected electrical parameters of the safety circuit, the electrical model is used to predict the parameter range under normal conditions. The data acquisition and processing control board uses the voltage detection circuit and the current detection circuit to collect the voltage and current signals of the safety circuit of the platform door in real time. Through pre-processing algorithms such as filtering, noise reduction, and outlier removal, the electrical parameters are monitored during each door opening and closing process. After multiple frequency and full-operation door opening and closing tests, the system has accumulated electrical data covering normal operation, critical conditions, and fault scenarios. Based on this data, a machine learning algorithm is used to construct a mathematical model of the door's electrical characteristics, accurately simulating the changing patterns of key parameters in the safety circuit, such as contact pull-in time, contact resistance, voltage, and current dynamic characteristics.

[0051] During operation, the real-time collected data is compared with the electrical model prediction value and fault rules to diagnose the fault type and location. When the feedback signal is at a stable level and the duration exceeds a certain threshold, it is determined to be a line circuit breaker fault. The threshold is summarized based on the fault rules to optimize the false alarm rate and missed alarm rate. When the error rate of the pulse sequence exceeds the set ratio, it is determined to be a signal distortion fault.

[0052] In order to conduct effective data analysis, an expert database was established and, based on the long-term accumulated experience in field fault handling, the corresponding relationships between various faults and voltage and current were obtained. Real-time operation data and historical fault data were used to summarize fault patterns through data screening and feature value extraction.

[0053] With the above-described preferred embodiments of the present invention as a guide, and with reference to the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the contents of the specification and must be determined according to the scope of the claims.

Claims

1. A platform door safety circuit detection system, characterized in that: Each platform door corresponds to a data acquisition and processing control board, which integrates a dynamic input interface circuit, a data acquisition module and a data processing module; The dynamic input interface circuit adopts a closed-loop pulse detection structure and includes a photocoupler O1 and a photocoupler O2 connected in series. The input stage of the photocoupler O1 is connected in series with the output stage of the photocoupler O2. The input stage of the photocoupler O2 is controlled on and off by the output port of the data acquisition and processing control board. The output port of the photocoupler O1 is connected to the input port of the data acquisition and processing control board. The data acquisition module includes multiple sensors for real-time acquisition of electrical parameters of the safety circuit, and the collected data is transmitted to the data processing module; The data processing module is used to receive data from the data acquisition module and pre-process the data; The data acquisition and processing control board periodically sends a pulse sequence to the input stage of the photoelectric coupler O2, and receives the signal fed back by the photoelectric coupler O1. The data acquisition and processing control board has a CPU that is used to verify the integrity and reversibility of the pulse sequence and determine the validity of the input signal.

2. The platform door safety circuit detection system according to claim 1, characterized in that: The electrical parameters collected in real time by the data acquisition module include voltage and current.

3. The platform door safety circuit detection system according to claim 1, characterized in that: The pre-processing includes filtering, amplification and digitization.

4. The platform door safety circuit detection system according to claim 1, characterized in that: The data collected by the data collection module is transmitted to the data processing module via wired communication.

5. A platform door safety circuit detection method, characterized in that: The following steps are involved: Each platform door is provided with a corresponding data acquisition and processing control board, which integrates a dynamic input interface circuit, a data acquisition module and a data processing module; A closed-loop pulse detection structure is used to implement a dynamic input interface circuit, and the dynamic input interface circuit includes a photocoupler O1 and a photocoupler O2. The input stage of the photocoupler O1 is connected in series with the output stage of the photocoupler O2. The input stage of the photocoupler O2 is controlled on and off by the output port of the data acquisition and processing control board. The output port of the photocoupler O1 is connected to the input port of the data acquisition and processing control board. The data acquisition module collects the electrical parameters of the safety circuit in real time through multiple sensors, and transmits the collected data to the data processing module; The data processing module receives the data from the data acquisition module and pre-processes the data; The data acquisition and processing control board periodically sends a pulse sequence to the input stage of the photoelectric coupler O2, and receives the signal fed back by the photoelectric coupler O1. The data acquisition and processing control board has a CPU, which determines the validity of the input signal by checking the integrity and reversibility of the pulse sequence.

6. The platform door safety circuit detection method according to claim 5, characterized in that: When the external input signal is high, the data acquisition and processing control board sends a pulse sequence, the photoelectric coupler O2 is turned on, causing the photoelectric coupler O1 to be turned on synchronously, and the signal fed back to the data acquisition and processing control board is the reverse pulse sequence of the pulse sequence sent by the data acquisition and processing control board; If the external input signal is at a low level or the pulse sequence is abnormal, the signal fed back to the data acquisition and processing control board will be at a stable level of 0 or 1, triggering a fault alarm.

7. The platform door safety circuit detection method according to claim 6, characterized in that: If the external input signal is low level or the pulse sequence is abnormal, it is judged as a fault and leads to a safe state.

8. The platform door safety circuit detection method according to claim 5, characterized in that: Two independent CPUs are used to verify the input signal. When the verification results of the two CPUs are consistent, the signal is judged to be normal; if the verification results of the two CPUs are inconsistent, it is judged to be a fault and leads to a safe state.

9. The platform door safety circuit detection method according to claim 5, characterized in that: A fault diagnosis algorithm based on a combination of rules and models is used to verify the external input signal.

10. The platform door safety circuit detection method according to claim 9, characterized in that: In the fault diagnosis algorithm, first, an electrical model of the safety circuit is established. Based on the collected electrical parameters of the safety circuit, the electrical model is used to predict the parameter range under normal conditions. During operation, the real-time collected data is compared with the predicted values of the electrical model and the fault rules to diagnose the type and location of the fault. When the feedback signal is at a stable level and the duration exceeds a certain threshold, it is determined to be a line circuit breaker fault. When the error rate of the pulse sequence exceeds the set ratio, it is determined to be a signal distortion fault.

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