A universal dcu for a platform door system and an adaptation method thereof

Abstract

The application relates to the technical field of platform door control, and particularly discloses a universal DCU (Door Control Unit) of a platform door system and an adaptation method of the universal DCU in a non-original factory modification scene. The universal DCU provided by the application adopts an architecture design of electrically connecting a universal control board and an interface board in a split type, when non-original factory modification adaptation is performed, a black box analysis method is integrated into a universal analysis early-stage process, the function attribution of control commands and power modules is determined, and through the adaptation mode of cooperation and combination of common characteristics and differentiated characteristics, program flashing and interface board replacement, universal replacement of one control board compatible with DCUs of multiple manufacturers is realized, the available equipment of the original system is maximally reserved, the modification cost and construction difficulty are reduced, the function optimization and subsequent upgrading demand are considered, and the economy and practicability of platform door system modification are improved.

Description

Technical Field

[0001] This invention belongs to the field of platform screen door control technology, specifically relating to a universal DCU for platform screen door systems and its adaptation method. Background Technology

[0002] As the core control unit of the platform screen door system, the DCU directly controls key functions such as motor drive, gate control, door status detection, and communication. Its operational stability is crucial to the operation of the platform screen door system. With the increasing years of operation of domestic rail transit lines, a large number of DCUs are gradually reaching their design life, experiencing performance degradation and frequent failures. Some original equipment manufacturers (OEMs) have even withdrawn from the field or discontinued related spare parts due to market adjustments. The need for DCU upgrades, retrofits, and replacements is becoming increasingly urgent, becoming a core requirement for the renovation of existing rail transit electromechanical systems.

[0003] Currently, there are two main types of retrofit and replacement models for DCUs in the industry, both of which have significant shortcomings and make it difficult to balance cost-effectiveness and practicality: One is the original factory replacement model. Although the modification is easy and does not require adjustment of the system architecture, the original factory monopolizes the technology and supply channels, which drives up the price of spare parts, resulting in high modification costs. Moreover, this model cannot be implemented directly when the original factory withdraws from the market or stops production. It also cannot solve the design defects of the original system or adapt to new operational needs. The second option is a non-original factory full system replacement mode. Although this can break the original factory monopoly, it requires replacing a large number of peripherals and related components that are still in normal operation with the new DCU as the benchmark, resulting in serious waste of resources, significantly increasing procurement and construction costs. At the same time, the construction cycle is long, the linkage debugging is difficult, and it exacerbates the interference with the normal operation of the line. Summary of the Invention

[0004] In response to the defects and problems of the current mainstream DCU retrofit and replacement methods, this invention provides a universal DCU for platform screen door systems and its adaptation method.

[0005] The universal DCU for platform screen door systems provided by this invention includes a detachable, electrically connected universal control board and interface board. The universal control board includes a main control chip, a control command conversion circuit, and several first interactive interfaces. The main control chip is electrically connected to the control command conversion circuit and the first interactive interfaces. The main control chip is used to calculate and issue platform screen door control commands, realize the opening and closing control of the platform screen door through the drive module, and acquire and record the real-time status information of the platform screen door. The control command conversion circuit is used to convert the control commands issued by the main control chip into signals that can be recognized by multi-brand associated components, and to standardize and convert the status signals and control signals fed back by each brand associated component before transmitting them to the main control chip. The interface board includes a second interactive interface, an interface conversion circuit, and an original system peripheral component interface. The second interactive interface is electrically connected to the original system peripheral component interface through the interface conversion circuit. The interface conversion circuit is used to complete the electrical level, drive power, and control logic conversion between the external interface and the control board circuit. The second interactive interface is adapted to connect with the first interactive interface to realize bidirectional transmission of status signals and control signals of the general-purpose control board and interface board.

[0006] The aforementioned platform screen door system general-purpose DCU, the interface board of which also includes an upgrade interface, is used to connect to and control the newly replaced peripheral component when the interface of the original system peripheral component is incompatible with the newly replaced peripheral component; the upgrade interface is electrically connected to the second interactive interface through an interface conversion circuit.

[0007] The aforementioned platform screen door system universal DCU has the same physical installation coordinates and overall layout position for external plugs as the original factory DCU, and the overall assembly and fixing form of the universal DCU is compatible with the original factory's predetermined installation and fixing method.

[0008] The aforementioned platform screen door system general-purpose DCU has several reserved interfaces for each of the first interactive interfaces. The reserved interfaces are initially designed as empty pins, which are used to design corresponding circuits based on the empty pins when additional functions are needed later. The main control chip also has empty pins reserved, and the number of empty pins reserved on the main control chip is not less than the total number of empty pins reserved on all the first interactive interfaces.

[0009] The above-mentioned method for adapting the universal DCU of the platform screen door system to non-original equipment manufacturer (OEM) retrofit scenarios includes the following steps: Step 1: Perform a generalized analysis on the core related components of DCUs from multiple manufacturers, extract the common and differential characteristics of each component, and construct a hierarchical adaptation strategy based on the control board and / or interface board based on the common and differential characteristics. Step 2: Based on the hierarchical adaptation strategy built in Step 1, a matching interface conversion circuit is paired with the general-purpose DCU. The interface conversion circuit is connected to the control command conversion circuit of the general-purpose control board and the interface of the original system peripheral components of the interface board to adapt and connect, so as to achieve compatibility and adaptation control of different brands of original systems and corresponding peripheral components.

[0010] The above adaptation method, step one specifically includes the following steps: S1. Black-box analysis method is used to analyze the external input and output logic, signal interaction timing and electrical linkage logic of DCU of multiple brands. A standardized external behavior logic model is constructed by external signal acquisition and analysis. DCU and directly related functional components are selected as analysis objects. S2. Collect unified samples of the technical parameters, control logic, and interface forms of all analysis objects, extract the basic functional requirements that all manufacturers must implement, as well as the general control logic and standard parameters for implementing these basic functions, and use them as the basis for the common function design of general-purpose control boards. S3. Classify and sort out the differences in adaptation methods, control modes, wiring forms and electrical parameters of all analysis objects, and distinguish the differences that need to be implemented by a general-purpose control board, the differences that need to be implemented by an adapter interface board, and the mixed differences that need to be implemented by both. Based on this, form a differentiated requirement classification result. S4. Based on the commonalities in step S2 and the differences in step S3, construct a hierarchical adaptation strategy based on the control board and the interface board.

[0011] The above-described adaptation method includes functional components such as power control, status feedback, indication control, communication interaction, and safety protection.

[0012] The above adaptation method, the layered adaptation strategy in step one includes: for differences in common functions and control logic, it is achieved by adjusting the control board; For differences in electrical interfaces, an adapter interface board is used to adjust the interface conversion circuit. For mixed differences involving the above situations, a general-purpose control board and an adapter interface board are used in conjunction to achieve the desired results.

[0013] The above adaptation method, in step one, also includes formulating hierarchical iteration rules for future new adaptation requirements, and solidifying the analysis results and iteration rules into a hierarchical adaptation system; the hierarchical iteration rules are as follows: for control logic compatibility requirements, adaptation is achieved through software upgrades; for electrical interface compatibility requirements, adaptation is achieved by replacing or adjusting the interface board; for complex new requirements, adaptation is achieved through collaborative iteration of the control board and the interface board.

[0014] In the above adaptation method, when the newly replaced peripheral component needs to be connected to both the original system peripheral component interface and the upgrade interface at the same time in step two, the two control circuits corresponding to the original system peripheral component interface and the upgrade interface are independent of each other and there is no signal interference. When the newly replaced peripheral component only needs to be connected to the interface of the original system peripheral component, it can be directly connected to the newly replaced peripheral component through the interface of the original system peripheral component. When a new peripheral component only needs to be connected to the upgrade interface, the upgrade interface reuses some or all of the hardware resources of the original system's peripheral component interface. Compared with the prior art, the beneficial effects of the present invention are: The present invention provides a control board and interface board architecture, with a universal analysis of core related components of DCU from multiple manufacturers. It can be compatible with the design standards of DCU from different manufacturers, adapt to the differentiated needs of all related components such as motors, gates, indicator lights, LCBs, emergency doors / end doors, etc., and also take into account the universal DCU control board for future upgrades, realizing "one control board to adapt to DCU from multiple manufacturers", retaining existing usable equipment to the maximum extent, and reducing the cost of transformation and construction difficulty. Attached Figure Description

[0015] Figure 1 This is a structural diagram of the general-purpose DCU system of the present invention; Figure 2 This is a schematic diagram showing the connection between the PEDC and DCU of the platform screen door system; Figure 3 This is a connection diagram for a general-purpose DCU connected to peripheral components, type one. Figure 4 This is a connection diagram for a general-purpose DCU to peripheral components, type two. Detailed Implementation

[0016] To address the shortcomings and problems of current mainstream DCU retrofitting and replacement methods, this invention provides a universal DCU. This DCU employs a control board and interface board design. Through a generalized analysis of core components of DCUs from multiple manufacturers, this universal DCU is used for non-original manufacturer retrofitting of existing system DCUs based on the analysis results. It is compatible with the design standards of DCUs from different manufacturers, adapting to the differentiated needs of all related components such as motors, gates, indicator lights, LCBs, emergency doors / end doors, etc., and also accommodates the future upgrades of the universal DCU control board. This allows a single control board to adapt to DCUs from multiple manufacturers, maximizing the preservation of existing usable equipment and reducing retrofitting costs and construction difficulty. The invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0017] Example 1: This example provides a universal DCU for platform screen door systems, such as... Figure 1 As shown, the general-purpose DCU consists of a general-purpose control board and an interface board, which are detachably electrically connected.

[0018] The general-purpose control board includes a main control chip, a control command conversion circuit, and several first interactive interfaces. The main control chip is electrically connected to the control command conversion circuit and the first interactive interfaces. The main control chip is used to calculate and issue platform door control commands, realize the opening and closing control of the platform door through the drive module, and also to acquire and record the real-time status information of the platform door. The control command conversion circuit is a multi-brand compatible circuit, designed by analyzing the control command transmission protocols, signal types, and level standards of different brands of DCUs. It can convert the control commands issued by the main control chip into signals that can be recognized by the associated components of each brand, and at the same time, it standardizes and converts the status signals and control signals fed back by the associated components of each brand before transmitting them to the main control chip. The interface board includes a second interactive interface, an interface conversion circuit, and an interface for the original system peripheral components. The second interactive interface is connected to the interface for the original system peripheral components through the interface conversion circuit. The interface conversion circuit is used to complete the conversion of electrical levels, drive power, and control logic between the external interface and the control board circuit. The first interactive interface and the second interactive interface are adapted to connect to realize bidirectional transmission of status signals and control signals between the general-purpose control board and the interface board.

[0019] As a preferred option, in order to solve the problem that the original system peripheral component interface is incompatible with the newly replaced peripheral component, the interface board is also designed to include an upgrade interface. The upgrade interface is connected to the second interactive interface through an interface conversion circuit, so as to connect to and control the newly replaced peripheral component when the original system peripheral component interface is incompatible with the newly replaced peripheral component.

[0020] The physical installation coordinates and overall layout of the external plugs of the universal DCU of this platform screen door system are consistent with those of the original DCU, and the overall assembly and fixing form of the universal DCU is compatible with the original factory's predetermined installation and fixing method.

[0021] In the specific design, multiple functions can be integrated and reused into the same first interactive interface; according to the number of first interactive interfaces, several reserved interfaces are reserved for each first interactive interface; the reserved interfaces are initially designed as empty pins, which are used to design corresponding circuits based on the empty pins when additional functions are needed later; the main control chip synchronously reserves empty pins, and the number of empty pins reserved on the main control chip is not less than the total number of empty pins reserved in all first interactive interfaces, ensuring that there are sufficient pin resources for later circuit design without modifying the main control chip structure.

[0022] This general-purpose DCU can be configured with two safety loop adapter versions, each adapting to different safety loop wiring methods: Version 1: The safety circuit is connected to the next sliding door after passing through the sliding door and the emergency door in sequence. The safety circuit of the general-purpose control board is only associated with the limit switch and LCB status of the corresponding sliding door. The safety circuit signal is connected and transmitted through the relevant safety circuit connectors, without the need for additional bypass connectors. Version 2: The safety circuit is accessed from the general-purpose DCU, returns to the general-purpose DCU after passing through the emergency door, and then connects to the next sliding door. The general-purpose DCU is equipped with an emergency door safety circuit bypass connector for bypassing the safety circuit in DCU scenarios without sliding doors.

[0023] Example 2: This example uses the universal DCU for platform screen door systems provided in Example 1 for non-original factory retrofitting of the original DCU system. The adaptation method includes: Step 1: Perform a generalized analysis of the core related components of DCUs from multiple manufacturers, extract the common and differentiated features of each component, and construct a hierarchical adaptation strategy based on the control board and / or interface board based on the common and differentiated features; specifically including the following steps: S1. Determine the analysis object and scope: Use black-box analysis method to analyze the external input / output logic, signal interaction timing and electrical linkage logic of multi-brand DCUs. Do not intrude on the original controller, do not decipher the original proprietary communication protocol, and do not read the original program source code. Only construct a standardized external behavior logic model through external signal acquisition and analysis. Select DCU and directly related functional components as analysis objects, covering five categories: power control, status feedback, indication control, communication interaction and safety protection.

[0024] As an example, when using black-box analysis to parse multi-brand DCUs, for the original system-specific control logic obtained from the parsing of multi-brand DCUs, an equivalent function substitution design is used to achieve adaptation; if the adaptation limitations of the original system-specific control logic cannot be avoided through an equivalent function substitution design, the functions corresponding to the specific control logic are first classified according to their technical necessity for the operation of the platform screen door system: 1) If it is a core safety function / basic control function that is indispensable for the operation of the platform screen door system, then abandon the third-party non-original alternative for the part to be replaced, and adopt the original spare parts replacement or the whole system replacement solution. 2) If it is a non-core, dispensable auxiliary / optimization function, then the function is directly discarded. Only the adaptation logic without control logic conflict is used to complete the adaptation design of the component to be replaced, ensuring that the core functions of the original system are implemented normally and that there is no conflict with the linkage logic of the unreplaced component.

[0025] S2. Extraction of common features of each component: Collect unified samples of the technical parameters, control logic and interface forms of all analysis objects, and extract the common functions and standard parameters that all manufacturers have, as the basis for the design of common functions of general control boards; S3. Classification and sorting of the differences in the characteristics of each component: Classify and sort the differences in the adaptation method, control mode, wiring form and electrical parameters of all analysis objects, and distinguish the differences that need to be implemented by the general control board, the differences that need to be implemented by the adapter interface board, and the mixed differences that need to be implemented by both. S4. Based on the common features of S2 and the differentiated features of S3, a layered adaptation strategy based on the control board and interface board is constructed. The layered adaptation strategy is as follows: common functions and control logic differences are uniformly integrated by the general-purpose control board to form the basic hardware architecture; electrical interface differences are independently implemented by the adapter interface board through interface conversion circuits; and hybrid differences are adapted by the general-purpose control board and the adapter interface board working together. Based on this, the selection of core components, circuit topology and interface definition are determined, forming a "Hardware Implementation Scheme Comparison Table".

[0026] Step 2: For DCUs of different brands, match the interface conversion circuit with the general-purpose DCU. The interface conversion circuit is connected to the control command conversion circuit of the general-purpose control board and the interface of the original system peripheral components of the interface board to achieve compatible control of the original system and corresponding peripheral components of different brands. At the same time, the interface board's upgrade interface is used to complete the access and control of newly replaced peripheral components.

[0027] When a new peripheral component needs to be connected to both the original system peripheral component interface and the upgrade interface, the two control circuits corresponding to the original system peripheral component interface and the upgrade interface are independent of each other and there is no signal interference. When the newly replaced peripheral component only needs to be connected to the interface of the original system peripheral component, it can be directly connected to the newly replaced peripheral component through the interface of the original system peripheral component. When a new peripheral component only needs to be connected to the upgrade interface, the upgrade interface reuses some or all of the hardware resources of the original system's peripheral component interface.

[0028] As a preferred approach, considering future new adaptation needs, step one also includes formulating iterative adaptation rules. Specifically, control logic compatibility requirements are prioritized for software upgrades, electrical interface compatibility requirements are achieved by replacing or adjusting the interface board, and complex new requirements are achieved through collaborative iteration between the control board and the interface board, ensuring the stability of the general-purpose control board's main architecture. It should be noted that the new version of this general-purpose control board is completely identical to the old version in terms of installation dimensions, interface definitions, and mounting hole positions. The new version can directly replace the old version in situ and is compatible with all the old version's adaptation and connection requirements.

[0029] Then, the "Common Function List", "Differentiated Function Classification List", "Hardware Implementation Scheme Comparison Table" and iterative adaptation rules were integrated into the "Multi-Manufacturer DCU Adaptation Technology Manual", forming a hierarchical adaptation system that is universal for control boards and scenario-specific for interface boards, thus solidifying the analysis results and iterative rules.

[0030] Test Example: This test example, combined with the specific scenario of replacing the DCU of a subway platform screen door with a non-original adapter, provides a detailed description of the embodiments of the present invention, as follows: Scenario Background: A subway line has been in operation for 12 years, and the core control component of the platform screen door system, the DCU (Door Control Unit), is showing significant signs of aging: the frequency of failures has increased by 40% in the past year compared to previous years, mainly manifested as delayed door opening and closing response and abnormal status feedback, repeatedly causing train arrival delays; moreover, the original equipment manufacturer has withdrawn from the rail transit market, original spare parts are unavailable, there is no complete technical support, and the proprietary communication protocol cannot be parsed, making it impossible to solve the problem through original factory upgrades or replacement with the same model. This DCU is a programmable core control component that integrates door opening and closing logic control, safety loop monitoring, and peripheral drive functions, such as... Figure 2 As shown, the associated components include PEDC (unit controller), LCB (local control box), gate lock, drive motor, door status indicator, emergency door status detection, end door status detection, etc. The universal DCU of this invention is required to achieve non-original factory replacement, while retaining the original system's non-aging associated components, taking into account functional optimization and subsequent upgrade requirements.

[0031] General-purpose DCU hardware setup: The general-purpose DCU in this embodiment consists of a general-purpose control board and a customized interface board, which are detachably electrically connected by a standardized connector.

[0032] Universal control board: Equipped with a high-performance main control chip, integrating a multi-brand compatible control command conversion circuit and 3 first interactive interfaces; the control command conversion circuit is designed after analyzing the control protocols and signal types of mainstream brand DCUs such as A, B, and C, and can realize multi-brand adaptation and conversion of control commands; 4 empty pins are reserved for each first interactive interface, and 12 empty pins are reserved for the main control chip to meet the needs of subsequent functional expansion.

[0033] Customized interface board: Configured with a second interactive interface adapted to the first interactive interface. The voltage and power of the original system peripheral component interface are fully matched with the original system peripheral. At the same time, one upgrade interface is reserved for the subsequent access of the intelligent monitoring module. For the safety circuit wiring method of this line, the first version of the safety circuit adaptation design is selected, and the emergency door safety circuit bypass connector is configured.

[0034] The connection structure between the general-purpose DCU and various peripheral components is shown in Figures 3 and 4. The physical installation coordinates and overall layout of the external plugs of this general-purpose DCU are completely consistent with the original factory DCU, and the assembly and fixing structure of the whole machine is compatible with the existing original factory installation and fixing methods. On this basis, by matching interface boards of different specifications, it is possible to adapt and control multiple peripheral components.

[0035] To apply this universal DCU to the non-original equipment manufacturer (OEM) retrofit of this subway line, the following steps were taken: First, a generalization analysis was conducted on the core related components of DCUs from multiple manufacturers in this line. DCU models with a high proportion of common features were selected for unified and universal design. S1. Determine the analysis object and scope: First, a black-box analysis method is used to analyze the external input / output logic, signal interaction timing, and electrical linkage logic of the original DCU and DCUs of the same type from multiple brands. The entire process does not intrude on the original controller or decipher the original proprietary communication protocol. Only by simulating external input signals such as PEDC door opening and closing commands and LCB manual / automatic switching signals, output feedback signals such as door action feedback and fault alarms, as well as the action timing of actuators, are collected to complete the full collection and analysis of external signals and construct a standardized external behavior logic model. Based on this model, five categories of related components are selected as the analysis objects: DCU and power control (drive motor, gate lock, power module), status feedback (door status sensor, limit switch), indication control (door status indicator light), communication interaction (PEDC, industrial computer, PEDC control command), and safety protection (LCB, safety circuit).

[0036] S2. Extraction of common features of each component: Collect unified samples of the technical parameters, control logic and interface forms of all analysis objects, extract the basic core functions of DCU and related components of all manufacturers as common functions, and extract the technical parameters that all manufacturers follow to achieve the basic functions as standard parameters, which serve as the core design basis for the common functions of the general control board.

[0037] Specific examples: 1) Door status indicator: All manufacturers' DCUs must implement the "basic control function of turning the door status indicator on / off" (corresponding to door open / closed status feedback). This basic control function is common and is independent of the hardware form and control method of the indicator. That is, the DCU must have the door status indicator control function.

[0038] 2) LCB Local Control Box: All manufacturers' DCUs must implement the basic core functions of LCB status acquisition and sliding door linkage control, namely, receiving local open and close commands and automatic and isolated position status signals issued by the LCB. The DCU combines these status signals with remote door opening and closing commands and implements the opening and closing control of the sliding door according to priority logic. This basic control function is a common requirement of all brands of DCUs. At the same time, the LCB underlying detection logic is disassembled and analyzed. The point detection methods of the three states of local open, local close, and isolated position are completely consistent. These three detection points are common features at the hardware design level. Based on this, the DCU should be equipped with LCB status detection function as standard, and the above three detection points can share a set of universal acquisition circuits to achieve hardware resource reuse and eliminate the need to design separate detection circuits for each point.

[0039] 3) Power control: All manufacturers use DC24V control signal and DC110V motor drive signal, taking these voltage parameters as standard parameters.

[0040] S3. Classification of Differentiated Features of Each Component: Classify and sort out the differences in adaptation methods, control modes, wiring forms and electrical parameters of all analyzed objects. Distinguish between control logic differences that need to be implemented by a general-purpose control board, electrical interface differences that need to be implemented by an adapter interface board, and hybrid differences that need to be implemented by both. Based on this, a classification result of differentiated requirements is formed, which serves as the design basis for subsequent layered hardware adaptation.

[0041] Specific examples: 1) Differences in adaptation methods under common functions (door status indicator): For the basic function of turning the indicator light on / off, some manufacturers' indicator lights have built-in power supply / microcontroller circuits, and the DCU only needs to output switch signals (contact on / off) to control them; while some manufacturers' indicator lights have a bare board structure, and the DCU needs to output DC24V power supply + switch signals for joint control. The two adaptation methods are the core difference requirements.

[0042] 2) Differences in Additional Functions under Common Functions (LCB Local Control Box): All manufacturers' DCUs are based on the core function of implementing sliding door linkage control based on LCB status and remote door opening / closing commands. Under this premise, there are three types of core differentiated requirements: First, differences in additional functions. Some manufacturers only implement the core linkage control function in their basic LCBs, while others add automatic position status indicator control as an additional function for upgraded LCBs. Second, differences in the implementation method of automatic position status detection. Manufacturers use two methods: setting independent automatic position detection points and using logic judgment based on signals from other points. Third, differences in the implementation method of the safety circuit bypass function. Manufacturers use two forms: internal bypass and external bypass.

[0043] 3) Purely non-common functional differences (network status control): Some manufacturers' DCUs have the function of "network status control and remote status upload", while some manufacturers' DCUs do not have this function at all. This independent function is a purely non-common differentiated requirement.

[0044] The aforementioned differentiated requirements are categorized according to whether they are mainstream in the industry. Dual-mode adaptation of indicator lights, automated detection / isolation position indicator lights of LCBs, and network status control are listed as mainstream differentiated requirements, serving as the core basis for physical overlay.

[0045] S4. Common functions adopt integrated circuit design, while differentiated functions adopt physical superposition circuit. Design a CAN / RS485 communication conversion module and form a "Hardware Implementation Scheme Comparison Table".

[0046] Core design implementation: 1) To address the dual-mode adaptation differences of door status indicator lights, two independent door status indicator light control circuits (pure switch control circuit and DC24V power supply + switch combined control circuit) are integrated on the general-purpose control board. Through different interface configurations of the interface board, either control circuit can be selectively connected without modifying the main hardware of the control board, ensuring that the control board is compatible with the two hardware forms of indicator lights.

[0047] 2) To address the differences in additional functions of LCBs, a unified status detection circuit and control circuit covering the core linkage control functions of both basic and upgraded LCBs are integrated on the general-purpose control board. This accurately matches the common detection requirements of local on, local off, and isolated positions, ensuring the basic function compatibility and universality of different LCB models. For the case where the basic LCB lacks an automatic position indicator light control function, an independent LCB automatic position indicator light control circuit is additionally integrated on the general-purpose control board. Relying on the main control chip to detect the working status of the LCB in real time, when the LCB is determined to be in the automatic position, this independent circuit is automatically triggered to complete the indicator light lighting action. The entire process does not require modification of external related components. Only through the hardware expansion design and program logic adaptation of the control board, the automatic position indicator function of the basic LCB can be optimized and upgraded, while being compatible with the original automatic position indicator light control requirements of the upgraded LCB. Regarding the differences in the implementation methods of the LCB safety loop bypass function, there is no need to adjust the main circuit of the general-purpose control board. Only by adding bypass contacts at the safety loop input and output terminals of the interface board, different bypass implementation forms can be adapted, taking into account both the universality and convenience of hardware adaptation.

[0048] 3) For non-common functions of network status control, a physical network communication circuit is superimposed. When this function is needed, the corresponding program can be flashed to activate it.

[0049] Ultimately, the goal is to achieve compatibility with common functions and various differentiated requirements of all brands by simply flashing different adapter programs and matching interface boards for DCUs and related components from different brands, without modifying the hardware structure of the universal control board.

[0050] Adaptation and replacement implementation steps: Black-box logic analysis and adaptation: Based on generalized analysis, combined with a high-sampling-rate non-intrusive interface logic detection device to assist in the collection of external observable data such as voltage, current, and signal timing at the DCU interface, the standardized external behavior logic model is optimized. Through full-dimensional technical matching analysis of control logic, it was found that the original DCU's exclusive control logic of "judging the gate's operating status by the electromagnet current state" has adaptation limitations. This function has no substantial impact on the operation of the equipment, so it is directly discarded to ensure that there are no control logic conflicts in the adaptation scheme.

[0051] Interactive Interface Adaptation: The core components involved in communication in the platform screen door system include the DCU, PEDC, and industrial control computer. The PEDC and industrial control computer employ a hardware reuse design (retaining the original hardware structure). It should be clarified that the PEDC's control functions are implemented independently through relay hardware circuits. Its communication-related programs do not participate in the core control logic of the platform screen door system; they only handle data transmission.

[0052] The established communication links between components are: DCU → PEDC, PEDC → industrial PC, industrial PC → integrated monitoring system. In this upgrade, the DCU is a completely new replacement component, and its communication protocol needs to be redesigned accordingly. The communication protocol between the industrial PC and the integrated monitoring system is provided by the subway company, and the platform screen door manufacturer will complete the custom adaptation. Therefore, no hardware modifications are required; only the communication-related programs for the PEDC and industrial PC need to be redesigned to achieve compatibility between the DCU and the existing communication links, and normal data exchange between the components.

[0053] The adaptation method for other interfaces (such as power control, status feedback, and indication control) is consistent with the logic of "control board integrating common circuits + physically superimposing differentiated circuits + interface board switching adaptation" mentioned above. They can be adapted one by one according to the corresponding standards, and will not be repeated here.

[0054] Simulation Verification: A simulation test environment completely identical to the original system is built to recreate the connection relationships and control logic of related components. A general-purpose DCU is connected to the simulation system to conduct three rounds of verification: consistency, functional performance, and upgrade compatibility. Consistency verification: The general-purpose DCU is consistent with the original system's door opening and closing linkage logic and safety circuit response, achieving a seamless replacement; Functional performance verification: The newly added safety circuit breakpoint detection function has an accuracy of 100%, the door opening and closing response delay is reduced to less than 100ms, and the anti-interference capability meets the electromagnetic compatibility standards of the subway. Upgrade compatibility verification: The intelligent operation and maintenance interfaces of mainstream multi-brand DCUs all adopt the 485 communication interface. This general-purpose DCU has reserved one 485 communication interface in advance, which can directly match the interface requirements of subsequent intelligent operation and maintenance upgrades. At the same time, the device has reserved circuit resources corresponding to the intelligent operation and maintenance detection function. During the upgrade, there is no need to modify the main structure of the DCU. The intelligent operation and maintenance function can be quickly activated and implemented simply by flashing the appropriate upgrade program.

[0055] On-site replacement: Replacement will be carried out during non-operational hours at night (0:30-4:00), using a "pre-wiring + offline testing" approach to complete the wiring and offline debugging of the general-purpose DCU in advance. Since the physical installation coordinates of the general-purpose DCU connectors are consistent with the original factory specifications, on-site replacement only requires removing the old DCU, connecting the new DCU, and securing the wiring harness. Replacement time per unit is ≤20 minutes. Under normal circumstances, DCU replacement and wiring should be completed within three window periods. If communication functionality needs to be maintained during replacement, a dual-system operation mode is required to ensure normal communication during the upgrade. This necessitates laying two new communication lines. While this method ensures uninterrupted communication, it extends the project timeline and increases costs. Therefore, a dual-system operation mode will be used initially to reduce risk. After verifying the construction process and equipment operational stability, a multi-group parallel construction mode will be switched, reducing the overall construction period from three window periods to one.

[0056] Joint commissioning and trial operation: After replacement, full-condition joint commissioning verification was carried out, covering scenarios such as normal operation, fault alarm, and emergency response. The linkage logic between the general-purpose DCU and the signal system and PEDC was verified, and the synchronization error between the door opening and closing and the train door was ≤50ms. After 72 hours of continuous trial operation monitoring, the DCU failure rate was 0. In the first month after being put into formal trial operation, there were no operational anomalies caused by the DCU, and the train arrival punctuality rate was improved to 99.8%.

[0057] Upgrade and adaptation: In response to the upgrade requirement of installing intelligent operation and maintenance functions on platform screen doors within 3 years for this line, the general-purpose DCU has been pre-added with a 485 communication interface, which is dedicated to the uploading and interaction of intelligent operation and maintenance data. It also has reserved circuit resources corresponding to the intelligent operation and maintenance detection function. During the upgrade, there is no need to modify the main structure of the DCU. The intelligent operation and maintenance detection and data upload functions can be quickly activated by simply flashing the adapted upgrade program, thus completing the installation and adaptation of the intelligent operation and maintenance function.

[0058] Example 2: This example specifically describes the interface conversion circuit in the interface board. The preconditions for the DCU are exactly the same as in Example 1. During the differentiation analysis of other brands of DCUs in the network, it was found that the safety circuit voltage of this brand's equipment is DC110V, which is a significant electrical parameter difference from the DC24V safety circuit used in conventional lines.

[0059] To accommodate this difference, a current-limiting resistor is added between the safety loop port and the second interactive interface on the interface board. This allows the safety loop breakpoint detection function, designed according to the DC24V standard in the general-purpose control board, to normally detect the status of the DC110V safety loop, further improving the applicability and versatility of the general-purpose control board.

[0060] Apart from the adaptive modifications to the interface board circuit mentioned above, the remaining structural composition, workflow, and implementation method are the same as in Experimental Example 1.

[0061] The above description is only a preferred embodiment of the present invention and does not limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A universal DCU for platform screen door systems, characterized in that: The system includes a detachable, electrically connected universal control board and interface board. The universal control board includes a main control chip, a control command conversion circuit, and several first interactive interfaces. The main control chip is electrically connected to the control command conversion circuit and the first interactive interfaces. The main control chip is used to calculate and issue platform door control commands, realize the opening and closing control of the platform door through the drive module, and acquire and record the real-time status information of the platform door. The control command conversion circuit is used to convert the control commands issued by the main control chip into signals that can be recognized by multi-brand associated components, and to standardize and convert the status signals and control signals fed back by each brand associated component before transmitting them to the main control chip. The interface board includes a second interactive interface, an interface conversion circuit, and an original system peripheral component interface. The second interactive interface is electrically connected to the original system peripheral component interface through the interface conversion circuit. The interface conversion circuit is used to complete the electrical level, drive power, and control logic conversion between the external interface and the control board circuit. The second interactive interface is adapted to connect with the first interactive interface to realize bidirectional transmission of status signals and control signals of the general-purpose control board and interface board.

2. The universal DCU for platform screen door systems according to claim 1, characterized in that: The interface board also includes an upgrade interface for connecting and controlling the newly replaced peripheral component when the original system peripheral component interface is incompatible with the newly replaced peripheral component; the upgrade interface is electrically connected to the second interactive interface through an interface conversion circuit.

3. The universal DCU for platform screen door systems according to claim 1, characterized in that: The physical installation coordinates and overall layout of the external plug-in of the general-purpose DCU are consistent with those of the original factory DCU, and the overall assembly and fixing form of the general-purpose DCU is compatible with the original factory's predetermined installation and fixing method.

4. The universal DCU for platform screen door systems according to claim 1, characterized in that: Each of the first interactive interfaces has several reserved interfaces; the reserved interfaces are initially designed as empty pins, which are used to design corresponding circuits based on the empty pins when additional functions are needed later; the main control chip synchronously reserves empty pins, and the number of empty pins reserved on the main control chip is not less than the total number of empty pins reserved in all the first interactive interfaces.

5. The method for adapting the universal DCU of the platform screen door system according to any one of claims 1-4 in non-original factory modification scenarios, characterized in that: Includes the following steps: Step 1: Perform a generalized analysis on the core related components of DCUs from multiple manufacturers, extract the common and differential characteristics of each component, and construct a hierarchical adaptation strategy based on the control board and / or interface board based on the common and differential characteristics. Step 2: Based on the hierarchical adaptation strategy built in Step 1, a matching interface conversion circuit is paired with the general-purpose DCU. The interface conversion circuit is connected to the control command conversion circuit of the general-purpose control board and the interface of the original system peripheral components of the interface board to adapt and connect, so as to achieve compatibility and adaptation control of different brands of original systems and corresponding peripheral components.

6. The method for adapting the universal DCU of the platform screen door system to non-original factory retrofit scenarios according to claim 5, characterized in that: Step one specifically includes the following steps: S1. Black-box analysis method is used to analyze the external input and output logic, signal interaction timing and electrical linkage logic of DCU of multiple brands. A standardized external behavior logic model is constructed by external signal acquisition and analysis. DCU and directly related functional components are selected as analysis objects. S2. Collect unified samples of the technical parameters, control logic, and interface forms of all analysis objects, extract the basic functional requirements that all manufacturers must implement, as well as the general control logic and standard parameters for implementing these basic functions, and use them as the basis for the common function design of general-purpose control boards. S3. Classify and sort out the differences in adaptation methods, control modes, wiring forms and electrical parameters of all analysis objects, and distinguish the differences that need to be implemented by a general-purpose control board, the differences that need to be implemented by an adapter interface board, and the mixed differences that need to be implemented by both. Based on this, form a differentiated requirement classification result. S4. Based on the commonalities in step S2 and the differences in step S3, construct a hierarchical adaptation strategy based on the control board and the interface board.

7. The method for adapting the universal DCU of the platform screen door system to non-original factory retrofit scenarios according to claim 5, characterized in that: The functional components include power control, status feedback, indication control, communication interaction, and safety protection functional components.

8. The method for adapting the universal DCU of the platform screen door system in non-original factory modification scenarios according to claim 5, characterized in that: The layered adaptation strategy described in step one includes: Differences in common functions and control logic can be addressed by adjusting the control panel. For differences in electrical interfaces, an adapter interface board is used to adjust the interface conversion circuit. For mixed differences involving the above situations, a general-purpose control board and an adapter interface board are used in conjunction to achieve the desired results.

9. The method for adapting the universal DCU of the platform screen door system to non-original factory retrofit scenarios according to claim 5, characterized in that: Step one also includes formulating hierarchical iteration rules for future new adaptation requirements, and solidifying the analysis results and iteration rules into a hierarchical adaptation system; the hierarchical iteration rules are as follows: for control logic compatibility requirements, adaptation is achieved through software upgrades; for electrical interface compatibility requirements, adaptation is achieved by replacing or adjusting the interface board; for complex new requirements, adaptation is achieved through collaborative iteration of the control board and the interface board.

10. The method for adapting the universal DCU of the platform screen door system in non-original factory modification scenarios according to claim 5, characterized in that: In step two, when the newly replaced peripheral component needs to be connected to both the original system peripheral component interface and the upgrade interface, the two control circuits corresponding to the original system peripheral component interface and the upgrade interface are independent of each other and there is no signal interference. When the newly replaced peripheral component only needs to be connected to the interface of the original system peripheral component, it can be directly connected to the newly replaced peripheral component through the interface of the original system peripheral component. When a new peripheral component only needs to be connected to the upgrade interface, the upgrade interface reuses some or all of the hardware resources of the original system's peripheral component interface.

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