Circuit for avoiding train driving data sharing storage duplex

Abstract

The utility model relates to a circuit for avoiding train running data sharing storage duplex, and belongs to the technical field of train running data safety. According to the utility model, the analog switch is arranged to realize the switching between the memory and the equipment master control module and the external access module, and at most only one of the equipment master control module and the external access module can access the memory at the same time, so that the console is not networked through the equipment master control module; the problem of data leakage of the console connected with the external access module when the external access module and the equipment master control access the memory at the same time is avoided, and the data security is improved.

Description

Technical Field

[0001] This utility model relates to a circuit for avoiding dual-connection of train operation data sharing and storage, belonging to the field of train operation data security technology. Background Technology

[0002] In today's world, trains are an indispensable mode of transportation, making train operation safety monitoring a necessity. Train operation data is generally stored in memory. Both the control console and the main device controller need to access this memory to retrieve train operation data. The control console is where the main device controller performs data dumping. The control console uses an external access module to retrieve train operation data from the memory and send it to a dedicated network. The main device controller accesses the memory to retrieve train operation data, and it is generally connected to the internet. If both the control console and the main device controller access the memory simultaneously, the control console may connect to the internet. Unlike ordinary devices, the control console cannot directly connect to the internet without security measures. Without such measures, there is a risk that the control console's train operation data will be leaked through the device's wireless network.

[0003] Existing technology detects the presence of external insertion signals through software and disconnects the device's wireless connection when such signals are detected. However, this method carries the risk of data leakage in the event of software vulnerabilities or network attacks. Utility Model Content

[0004] The purpose of this invention is to provide a circuit for avoiding dual-connection of train operation data sharing storage, so as to solve the problem of train operation data leakage on the control console connected to the external access module when the external access module and the main control of the device access the memory at the same time.

[0005] This utility model provides a circuit for avoiding dual-linked sharing of train operation data storage to solve the above-mentioned technical problems. It includes a memory, a device main controller, and an external access module. The memory stores train operation data and also includes an analog switch. The analog switch is connected to the memory, the device main controller, and the external access module to realize the switching between the memory and the device main controller and the external access module respectively. At most one of the device main controller and the external access module can be connected to the memory at the same time.

[0006] Furthermore, the device master controller is also connected to a communication module for communicating with the outside world, and the analog switch is also used to cut off the power supply of the communication module when the external access module is connected to the memory.

[0007] Furthermore, the analog switch is a single-pole double-throw analog switch, which includes a logic input terminal, a signal input terminal, a first signal output terminal, and a second signal output terminal. The signal input terminal is connected to the memory, the first signal output terminal is connected to the external access module, and the second signal output terminal is connected to the device main controller. The logic input terminal is used to detect whether an external data line is connected to the external access module. When an external data line is detected to be connected to the external access module, the signal input terminal of the analog switch is connected to the first signal output terminal. When no external data line is detected to be connected to the external access module, the signal input terminal is connected to the second signal output terminal.

[0008] Furthermore, the analog switch used is an analog switch of model SGM5018YTS / TR.

[0009] Furthermore, the memory is an SD card, and the external access module is a card reader.

[0010] Furthermore, the communication module is a wireless communication module, powered by the device's main control unit.

[0011] Furthermore, the memory, device controller, and external access module are all connected to the analog switch via data lines.

[0012] The beneficial effects of this utility model are: This utility model achieves switching between the memory and the main control unit and the external access module by setting an analog switch, and ensures that at most one of the main control unit and the external access module can access the memory at the same time, preventing the control console from being connected to the network through the main control unit. This avoids the problem of train operation data leakage caused by the external access module and the main control unit accessing the memory at the same time, thus improving the security of train operation data. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the circuit principle of this utility model used to avoid the dual-connection of train operation data sharing and storage;

[0014] Figure 2 This is a schematic diagram illustrating the working principle of the device's main controller when it detects the insertion of an external data cable during normal operation.

[0015] Figure 3 This is a schematic diagram illustrating the working principle of the device when the main controller malfunctions and detects the insertion of an external data cable.

[0016] Figure 4 This is a schematic diagram of the electrical principle of an analog switch used in the present invention to avoid the use of a dual-connection circuit for sharing and storing train operation data. Detailed Implementation

[0017] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0018] This invention adds an analog switch to enable the switching between the memory and the device main control module and the external access module. When an external connection is detected, the analog switch switches the data line to the external access module. When no external connection is detected, the analog switch switches the data line to the data line of the device main control module, enabling the device main control module to access the memory. At any given time, it ensures that only one of the device main control module and the external access module can access the memory.

[0019] This utility model provides a circuit for avoiding dual-connection of train operation data sharing and storage, such as... Figure 1 As shown, it includes a memory, a device controller, an external access module, and an analog switch. The analog switch is connected to the memory, the device controller, and the external access module to enable communication between the memory and the device controller and the external access module, respectively. At most one of the device controller and the external access module can be connected to the memory at any given time.

[0020] Specifically, the analog switch in this invention is a single-pole double-throw analog switch. This analog switch can be single-channel or multi-channel. In this embodiment, the SGM5018YTS / TR analog switch is used. This switch is a four-channel analog switch, including four sets of output channels. Each set of output channels has two output terminals, used to connect to the two devices to be switched (in this embodiment, the device main control and external access module). It also includes signal input terminals and logic input terminals. The signal input terminals are used to connect to the memory, and the logic input terminals are used to connect to external access to detect whether an external line is connected. Based on the detection result of the logic input terminals, the input terminals are controlled to connect to one of the two output terminals, such as... Figure 4 As shown. TF0_Dx (including TF0_D0, TF0_D1, TF0_D2, and TF0_D3) is the memory card signal terminal, used to connect to the memory. SDIO0x is the device main control connection line, connected to the device main control. S2MDx is the external access connection line, connected to the external access module. 5G_POW_EN is used to cut off the wireless network signal during switching. VCC5.0V_USBC is the TYPE-C insertion detection signal. When not inserted, the signal is floating, SEL is pulled low, and SDIOx is selected as the card reader line; after insertion, VCC5.0V_USBC pulls SEL high, selecting S2MDx as the card reader line.

[0021] In this embodiment, the memory uses an SD card. Therefore, the external access module uses a card reader chip, such as the GL3224 chip, which uses a Type-C interface. The device controller is connected to a communication module, which can be a wireless internet module. The device controller can communicate with external devices through this wireless internet module. Both the main controller and the card reader have corresponding data lines. The device controller is connected to one output terminal of the analog switch's output channel via a data line, and the card reader is connected to the other output terminal of the analog switch's output channel via a data line. The SD card is connected to the signal input terminal of the analog switch via a data line. In this way, the analog switch can switch between SD card access by switching the data lines of the card reader and the device controller.

[0022] Specifically, the card reader is powered by an externally connected cable. Whether an external data line is connected to the external access module can be determined by detecting the power voltage on the external line. When an external data line is detected, power is supplied to the card reader. At this time, the logic input of the analog switch detects a high level, and the analog switch switches to the data line of the card reader chip. The card reader can then access the SD card and read data from it. Since dual-network access is not allowed on a single device, the user cannot see whether the SD card is actually connected. Once a device or data line is connected to the control panel, that device cannot access the internet. Therefore, this invention also requires the analog switch to disable the power supply to the wireless internet module, so that the wireless internet module cannot work due to power loss, thereby ensuring that the device's main control cannot access the internet. Figure 3 As shown, the power supply for the wireless internet module is provided by the device itself, with an analog switch providing high and low level signals to control the power circuit in response to power failure. When no external data line is detected connecting to the external access module, the logic input of the analog switch detects a low level, and the analog switch switches to the data line of the device's main controller. At this time, the device's main controller can access the SD card and read data from it. Since the device cannot operate on dual networks simultaneously, the analog switch simultaneously disables the power supply to the wireless internet module, preventing it from working due to power loss. This ensures that the device's main controller cannot access the internet while reading from the SD card, avoiding data leakage caused by internet access during data reading.

[0023] In addition, when the main control unit of the equipment is not powered and is not working, such as Figure 2 As shown, if an external line connection is detected, the analog switch can still be switched to the data line of the card reader chip. At this time, the card reader can access the SD card and read data from it. Since the main control unit is not powered and not working, there is no need to disable the power supply of the wireless network module; simply switch the data line to the data line on the card reader. Therefore, even when the main control unit is not working, the card reader can still operate with power from an external connection to access SD card data.

[0024] Therefore, this invention utilizes an analog switch to solve the media sharing problem. When an external connection is detected, the analog switch switches the data line to the card reader (i.e., the external access module) and simultaneously disables the power supply to the communication module of the device's main control unit, thus resolving the inability to connect to the network via the device's main control unit. When no external connection input is detected, the analog switch switches the data line to the device's main control unit's data line, enabling the device's main control unit to access the memory. Furthermore, the analog switch of this invention operates only in one direction; even if it fails, it will at most prevent the memory data from being read and will not prevent the control unit from connecting to the network via the device's main control unit.

[0025] Compared to existing switching methods, this invention utilizes hardware circuitry for more reliable disconnection. There are two scenarios after external connection: normal and fault. Under normal conditions, it functions as intended. Fault scenarios have two possibilities: detection failure (in which case switching cannot be completed, equivalent to the external device being unable to connect to the storage medium); and switching failure (in which case neither can access the medium, and the connection is invalid). Therefore, this invention effectively solves the problems of dual control and dual connection of a single device and improves reliability.

Claims

1. A circuit for avoiding dual-linked shared storage of train operation data, comprising a memory, a device main controller, and an external access module, wherein the memory stores train operation data, characterized in that, It also includes an analog switch, which is a single-pole double-throw analog switch. The analog switch includes a logic input terminal, a signal input terminal, a first signal output terminal, and a second signal output terminal. The signal input terminal is connected to the memory, the first signal output terminal is connected to the external access module, and the second signal output terminal is connected to the device main controller. The logic input terminal is used to detect whether an external data line is connected to the external access module. When an external data line is detected to be connected to the external access module, the signal input terminal of the analog switch is connected to the first signal output terminal. When no external data line is detected to be connected to the external access module, the signal input terminal is connected to the second signal output terminal. This enables the switching between the memory and the device main controller and the external access module, and at most one of the device main controller and the external access module can be connected to the memory at any given time.

2. The circuit for avoiding dual-connection of train operation data sharing storage according to claim 1, characterized in that, The device master controller is also connected to a communication module for external communication, and the analog switch is also used to cut off the power supply of the communication module when the external access module is connected to the memory.

3. The circuit for avoiding dual-linked sharing and storage of train operation data according to claim 1, characterized in that, The analog switch used is an SGM5018YTS / TR analog switch.

4. The circuit for avoiding dual-connection of train operation data sharing storage according to claim 1, characterized in that, The memory is an SD card, and the external access module is a card reader.

5. The circuit for avoiding dual-connection of train operation data sharing storage according to claim 2, characterized in that, The communication module is a wireless communication module, powered by the device's main control unit.

6. The circuit for avoiding dual-connection of train operation data sharing storage according to claim 1, characterized in that, The memory, device controller, and external access module are all connected to the analog switch via data lines.

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