CN211478918U - Train control device - Google Patents
Train control device Download PDFInfo
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- CN211478918U CN211478918U CN202020202981.9U CN202020202981U CN211478918U CN 211478918 U CN211478918 U CN 211478918U CN 202020202981 U CN202020202981 U CN 202020202981U CN 211478918 U CN211478918 U CN 211478918U
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Abstract
The utility model provides a train control device relates to electrical control technical field, include: the communication board, first main control board, the second main control board, first input/output board, the second input/output board, fieldbus through with first main control board, the second main control board, first input/output board, the second input/output board constitutes two sets of control devices, fieldbus respectively with communication board, first main control board, the second main control board, first input/output board, second input/output board electric connection, first input/output board, the second input/output board respectively with train equipment electric connection, be favorable to improving train control device's reliability.
Description
Technical Field
The utility model relates to an electrical control technical field especially relates to a train control device.
Background
With the development of the times, a train becomes a common transportation means, and if a fault occurs, the trip of people is seriously affected, so how to develop a train control device with high reliability becomes one of the problems to be solved in the field.
Most of the existing train control devices are relay control devices, and in order to complete a control task, various input devices (buttons, control switches, limit switches, sensors and the like) are connected with a control circuit with certain logic, which is composed of a plurality of intermediate relays, time relays, counting relays and the like, by adopting a lead, and then train devices (a traction transformer oil pump, a converter water pump, an air conditioning system and the like) are controlled to execute actions by output devices (executing elements such as a contact network, an electromagnetic valve and the like).
The relay is a contact switch device, the use frequency of the relay is limited, and the use effect of the relay is also influenced by contact corrosion caused by environmental factors, so that the relay control device is easy to break down; in addition, because the relay control device is large in size and complex in wiring, the conventional relay control device can only accommodate necessary relays, even if only one relay fails, the abnormality of train equipment can be caused, and the reliability of the conventional train control device is poor.
SUMMERY OF THE UTILITY MODEL
The utility model provides a train control device is favorable to improving train control device reliability.
In order to realize the technical effect, the utility model provides a train control device, include: the system comprises a communication board, a first main control board, a second main control board, a first input/output board, a second input/output board and a field bus;
the field bus is electrically connected with the communication board, the first main control board, the second main control board, the first input/output board and the second input/output board respectively;
the first input/output board and the second input/output board are electrically connected with the train equipment respectively.
Optionally, the communication board includes: the system comprises a first communication controller, a second communication controller, a first communication processor, a second communication processor, a first bus controller and a second bus controller;
the above-mentioned field bus includes: a first bus and a second bus;
the first communication processor is electrically connected to the first communication controller, the second communication processor, the first bus controller and the second bus controller, respectively, and the second communication processor is electrically connected to the second communication controller;
the first bus controller is electrically connected to the first bus, and the second bus controller is electrically connected to the second bus.
Optionally, the communication board further includes: a third bus controller and a fourth bus controller;
the fieldbus described above further includes: a third bus and a fourth bus;
the second communication processor is electrically connected with the third bus controller and the fourth bus controller respectively;
the third bus controller is electrically connected to the third bus, and the fourth bus controller is electrically connected to the fourth bus.
Optionally, the first main control board includes: the system comprises a master control information converter, a master control processor, a first master control bus controller and a second master control bus controller;
the master control processor is electrically connected with the master control information converter, the first master control bus controller and the second master control bus controller respectively;
the first bus and the third bus are respectively electrically connected with the first master control bus controller;
the second bus and the fourth bus are electrically connected with the second master bus controller respectively.
Optionally, the first input/output board includes: the input/output information converter, the input/output processor, the first input/output bus controller and the second input/output bus controller;
the input/output processor is electrically connected with the input/output information converter, the first input/output bus controller and the second input/output bus controller respectively;
the first bus and the third bus are respectively electrically connected with the first input/output bus controller;
the second bus and the fourth bus are electrically connected to the second input/output bus controller, respectively.
Optionally, the types of the first communication controller and the second communication controller are specifically an MVB controller or an ethernet controller.
Optionally, the communication board further includes: a memory;
at least one of the first communication processor and the second communication processor is electrically connected with the memory.
Optionally, the train control device further includes: a first power supply board and a second power supply board;
the input end of the first power panel and the input end of the second power panel are respectively electrically connected with a train power supply;
the output end of the first power supply board is electrically connected with the communication board, the first main control board and the first input/output board respectively;
the output end of the second power panel is electrically connected with the communication panel, the second main control panel and the second input/output panel respectively.
Optionally, the communication board, the first main control board, the second main control board, the first input/output board, the second input/output board, and the field bus are disposed on a PCB backplane.
Optionally, hot plug connectors are disposed between the fieldbus and the first main control board, and between the fieldbus and the second main control board.
It is from top to bottom apparent, the utility model provides a train control device, include: the train control device comprises a communication board, a first main control board, a second main control board, a first input/output board, a second input/output board and a field bus, wherein each control device in the train control device is small in size and simple in routing, so that redundancy can be arranged on each control device, the first main control board, the second main control board, the first input/output board and the second input/output board form two groups of control devices, the field bus is respectively and electrically connected with the communication board, the first main control board, the second main control board, the first input/output board and the second input/output board, and the first input/output board and the second input/output board are respectively and electrically connected with train equipment; based on this train control device's structure, in practical application, can dispose the main control board trouble for the communication board and switch over the function certainly, this main control board trouble is from the function specifically: when the communication board detects that the second main control board or the second input/output board has a fault, the communication board controls the second main control board and the second input/output board to stop and controls the first main control board and the first input/output board to operate, and the first main control board controls the first input/output board to transmit signals to each train device; when the communication board detects that the first main control board or the first input/output board has a fault, the communication board controls the first main control board and the first input/output board to stop and controls the second main control board and the second input/output board to operate, and the second main control board controls the second input/output board to transmit signals to each train device, so that the technical effect of normally operating each train device can be still maintained when the train control device has a partial fault, and the reliability of the train control device is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.
Fig. 1 is a schematic structural diagram of an embodiment of a train control device provided by the present invention;
fig. 2 is a schematic structural diagram of an embodiment of the communication board provided by the present invention;
fig. 3 is a schematic structural diagram of an embodiment of the first main control board and the first input/output board provided by the present invention.
In the figure: 101-a communication board; 1011-a first communication controller; 1012-a second communication controller; 1013-a first communication processor; 1014-a second communication processor; 1015 — a first bus controller; 1016-a second bus controller; 1017-a third bus controller; 1018-fourth bus controller; 1019-memory; 102-a first master control board; 1021 master information converter; 1022 — a master processor; 1023-a first master bus controller; 1024 — a second master bus controller; 103-a second main control board; 104-a first input-output board; 1041-an input-output information converter; 1042 — an input output processor; 1043 — a first input output bus controller; 1044 — a second input output bus controller; 105-a second input-output board; 106-field bus; 1061 — a first bus; 1062 — a second bus; 1063 — a third bus; 1064-fourth bus; 107-first power panel; 108-second power panel.
Detailed Description
In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
As shown in fig. 1, the utility model provides a train control device, include: the system comprises a communication board 101, a first main control board 102, a second main control board 103, a first input/output board 104, a second input/output board 105 and a field bus 106;
the field bus 106 is electrically connected with the communication board 101, the first main control board 102, the second main control board 103, the first input/output board 104 and the second input/output board 105 respectively;
the first input/output board 104 and the second input/output board 105 are electrically connected to the train equipment, respectively.
It should be noted that the communication board can communicate with external devices;
the communication board can communicate with a Dial Control Center (DCC);
the communication boards of the train control devices can communicate with each other.
Based on the utility model provides a train controlling means, in practical application, can dispose the main control board trouble for the communication board and switch over the function certainly, this main control board trouble is from switching over the function specifically to be:
when the communication board detects that the second main control board or the second input/output board has a fault, the communication board controls the second main control board and the second input/output board to stop and controls the first main control board and the first input/output board to operate; when the communication board detects that the first main control board or the first input/output board has a fault, the communication board controls the first main control board and the first input/output board to stop and controls the second main control board and the second input/output board to operate;
in practical application, the communication board may also perform corresponding control on the first main control board, the second main control board, the first input/output board, and the second input/output board based on the instruction received in the communication.
Specifically, the first main control board 102 is configured to receive a signal from the first input/output board 104, process the signal, and send the signal to the first input/output board 104 to control the first input/output board; the second main control board 103 is configured to receive and process signals from the second input/output board 105, and to send signals to the second input/output board 105 to control the second input/output board.
Specifically, the first input/output board 104 is configured to receive a signal fed back by the train device, and send a signal to the train device based on the signal received from the first main control board 102, so as to control the train device; the second input and output board 105 is configured to receive a signal fed back by the train device, and send a signal to the train device based on the signal received from the second main control board 103, so as to control the train device.
Alternatively, as shown in fig. 2, the communication board 101 includes: a first communication controller 1011, a second communication controller 1012, a first communication processor 1013, a second communication processor 1014, a first bus controller 1015, and a second bus controller 1016;
the field bus 106 includes: a first bus 1061 and a second bus 1062;
the first communication processor 1013 is electrically connected to the first communication controller 1011, the second communication processor 1014, the first bus controller 1015 and the second bus controller 1016 respectively, and the second communication processor 1014 is electrically connected to the second communication controller 1012;
the first bus controller 1015 is electrically connected to the first bus 1061, and the second bus controller 1016 is electrically connected to the second bus 1062.
Specifically, the first communication processor 1013 is configured to receive a signal from the first communication controller 1011 and process the signal, and send the processed signal to the first main control board 102 or the second main control board 103 or the first input/output board 104 or the second input/output board 105 through the first bus controller 1015 and the first bus 1061, so as to control the first main control board 102 or the second main control board 103 or the first input/output board 104 or the second input/output board 105;
the second communication processor 1014 is configured to receive and process a signal from the second communication controller 1012, and send the processed signal to the first communication processor 1013, and the first communication processor 1013 is further configured to send the processed signal to the first main control board 102 or the second main control board 103 or the first input/output board 104 or the second input/output board 105 through the second bus controller 1016 and the second bus 1062, so as to control the first main control board 102 or the second main control board 103 or the first input/output board 104 or the second input/output board 105.
It should be noted that, the first communication controller and the second communication controller can communicate with the outside respectively, the specific communication mode depends on the category of the first communication controller and the second communication controller, the first communication processor and the second communication processor are respectively used for processing the signals received by the first communication controller and the second communication processor, and the first communication processor and the second communication processor can communicate with each other, so that when the first communication controller or the second communication controller fails, the communication controller without failure can be adopted to maintain normal communication with the outside and perform failure warning to the outside, so as to support normal operation of the train and improve the reliability of the train control device.
Optionally, as shown in fig. 2, the communication board 101 further includes: a third bus controller 1017 and a fourth bus controller 1018;
the fieldbus 108 further comprises: a third bus 1083 and a fourth bus 1084;
the second communication processor 1013 is electrically connected to the third bus controller 1017 and the fourth bus controller 1018, respectively;
the third bus controller 1017 is electrically connected to the third bus 1063, and the fourth bus controller 1018 is electrically connected to the fourth bus 1064.
It should be noted that the third bus controller and the third bus are redundant backups of the first bus controller and the first bus, respectively, and the fourth bus controller and the fourth bus are redundant backups of the second bus controller and the second bus, respectively, that is, when the first bus controller or the first bus fails or the second bus controller or the second bus fails, the third bus controller and the fourth bus controller can be switched to corresponding redundant backup devices for communication, so as to avoid the occurrence of failure of the train control device due to failure of part of the bus controllers or buses of the train control device, and improve the reliability of the train control device.
Optionally, the types of the first bus 1061, the second bus 1062, the third bus 1063, and the fourth bus 1064 are specifically a CAN bus or an RS485 bus.
Specifically, the types of the first bus 1061, the second bus 1062, the third bus 1063, and the fourth bus 1064 may also be other field bus types to meet the usage requirement.
Optionally, the first communication controller 1011 and the second communication controller 1012 are MVB controllers or ethernet controllers, where the MVB controllers are Multifunction Vehicle Bus (MVB) controllers.
Optionally, as shown in fig. 2, the communication board 101 further includes: a memory 1019;
at least one of the first communication processor 1013 and the second communication processor 1014 is electrically connected to the memory 1019.
Specifically, the memory 1019 may be used to store a running log of the train control device, including: the operation duration and the fault record of each device, and the first communication processor 1013 and the second communication processor 1014 can perform corresponding regulation and control according to the information in the operation log; for example, each time the train control device is started, the device with long and short running time can be started preferentially according to the running time of each device in the running log, so that the use intensity of each device in unit time is reduced, and the failure rate of the train control device is reduced.
Optionally, as shown in fig. 3, the first main control board 102 includes: a master information converter 1021, a master processor 1022, a first master bus controller 1023, and a second master bus controller 1024;
the master control processor 1022 is electrically connected to the master control information converter 1021, the first master bus controller 1023, and the second master bus controller 1024, respectively;
the first bus 1061 and the third bus 1063 are respectively electrically connected to the first master bus controller 1023;
the second bus 1062 and the fourth bus 1064 are electrically connected to the second master bus controller 1024, respectively.
Optionally, the first input/output board 104 includes: an input/output information converter 1041, an input/output processor 1042, a first input/output bus controller 1043, and a second input/output bus controller 1044;
the input/output processor 1042 is electrically connected to the input/output information converter 1041, the first input/output bus controller 1043, and the second input/output bus controller 1044, respectively;
the first bus 1061 and the third bus 1063 are electrically connected to the first i/o bus controller 1043, respectively;
the second bus 1062 and the fourth bus 1064 are electrically connected to the second i/o bus controller 1044, respectively.
It should be noted that the first main control board, the first input/output board, the second main control board, and the second input/output board are redundant and backup for each other, so the structures of the second main control board and the second input/output board correspond to the structures of the first main control board and the first input/output board one to one.
Specifically, the master information converter 1021 and the i/o information converter 1041 are used for converting the message information into the type of information that can be processed by the master processor 1022 and the i/o processor 1042.
It should be noted that, data transmitted in the fieldbus is message information, and the master processor and the input/output processor cannot directly process the message information and cannot directly send the message information to the train equipment to control the train equipment, so in the information interaction process of the master processor and the input/output processor, information conversion needs to be performed through the master information converter and the input/output information converter to obtain information that can be processed by the master processor and the input/output processor or message information that can be transmitted in the fieldbus.
Optionally, the first communication processor 1013, the second communication processor 1014, the main control processor 1022, and the input/output processor 1042 may be a micro control unit, or may be other types of devices with computing capability, and are not limited herein
Optionally, the number of the first input/output board 104 and the second input/output board 105 is more than one.
It should be noted that the number of the first input/output boards and the number of the input interfaces or the output interfaces of one first input/output board are both more than one, and the first input/output boards can be configured according to actual situations; the number of the second input/output boards and the number of the input interfaces or the output interfaces of one second input/output board are more than one, and the second input/output boards can be configured according to actual conditions.
Optionally, as shown in fig. 1, the train control device further includes: a first power supply board 107 and a second power supply board 108;
the input end of the first power panel 107 and the input end of the second power panel 108 are electrically connected with a train power supply respectively;
the output end of the first power board 107 is electrically connected with the communication board 101, the first main control board 102 and the first input/output board 104 respectively;
the output end of the second power board 108 is electrically connected to the communication board 101, the second main control board 103, and the second input/output board 105, respectively.
Specifically, the power supply voltage of the train power supply is dc 110 volts (i.e., V), and the first power board 107 is configured to convert the dc 110V into dc 5V, and respectively supply the dc 5V to the communication board 101, the first main control board 102, and the first input/output board 104; the second power board 108 is configured to convert the direct current 110V into a direct current 5V, and respectively supply the communication board 101 and the second main control board 103 with the direct current 5V to the second input/output board 105.
Specifically, the input ends of the first power board 107 and the second power board 108 are isolated from the output ends, and have functions of output over-voltage and under-voltage protection, output overload protection, short-circuit protection and fault self-recovery.
The first input/output board and the second input/output board are used for controlling a direct current 110V signal, and can receive and transmit the direct current 110V signal with the train equipment, so that the train control device performs contactless control on the train equipment (the contactless switch on the train equipment is controlled by adopting the direct current 110V signal), and compared with the method of performing contact control on the train equipment through a relay switch, the fault rate of the train control device is reduced.
Optionally, the communication board 101, the first main control board 102, the second main control board 103, the first input/output board 104, the second input/output board 105, and the field bus 106 are disposed on the PCB backplane.
Specifically, the PCB back plate may be one of a glass fiber fabric substrate, a paper-based copper clad plate and a metal-based copper clad plate, or may be a PCB back plate made of other materials, and the PCB back plate is not limited herein.
Optionally, hot plug connectors are disposed between the fieldbus 106 and the first master control board 102, and between the fieldbus 106 and the second master control board 103.
It should be noted that, the main control processor in the first main control board is responsible for the main control logic calculation work, so the device of the first main control board is easy to generate fault, which results in higher fault rate of the first main control board and needs to be replaced frequently, and similarly, the second main control board also does so;
the hot plug connectors are respectively arranged between the first main control board and the field bus, and the hot plug software function is configured in the first main control board and the second main control board, so that the first main control board or the second main control board can be replaced on the premise of not influencing the normal operation of the train control device, and the efficiency of replacing the first main control board or the second main control board is improved.
Optionally, the train control device further includes: a dry contact plate;
the dry contact plate is electrically connected with the field bus.
It should be noted that the dry contact board may control a part of the train equipment based on the signal received from the fieldbus, such as: controlling the opening and closing of the train emergency braking loop;
the dry contact point board is mainly used for controlling different systems, can effectively isolate each system while finishing a control process, and avoids mutual interference among the systems.
Optionally, the train control device further includes: a wiring board;
it should be noted that, each interface corresponding to the first input/output board and the second input/output board is arranged on the wiring board, and each interface is electrically connected with each input interface or output interface of the first input/output board and the second input/output board, so that the wiring board can be placed in a place convenient for operation, and the efficiency of workers in installing or overhauling train equipment is improved.
It is from top to bottom apparent, the utility model provides a train control device, include: the train control device comprises a communication board, a first main control board, a second main control board, a first input/output board, a second input/output board and a field bus, wherein each control device in the train control device is small in size and simple in routing, so that redundancy can be arranged on each control device, the first main control board, the second main control board, the first input/output board and the second input/output board form two groups of control devices, the field bus is respectively and electrically connected with the communication board, the first main control board, the second main control board, the first input/output board and the second input/output board, and the first input/output board and the second input/output board are respectively and electrically connected with train equipment; based on this train control device's structure, in practical application, can dispose the main control board trouble for the communication board and switch over the function certainly, this main control board trouble is from the function specifically: when the communication board detects that the second main control board or the second input/output board has a fault, the communication board controls the second main control board and the second input/output board to stop and controls the first main control board and the first input/output board to operate, and the first main control board controls the first input/output board to transmit signals to each train device; when the communication board detects that the first main control board or the first input/output board has a fault, the communication board controls the first main control board and the first input/output board to stop and controls the second main control board and the second input/output board to operate, and the second main control board controls the second input/output board to transmit signals to each train device, so that the technical effect of normally operating each train device can be still maintained when the train control device has a partial fault, and the reliability of the train control device is improved.
The present invention is not limited to the above-described embodiments, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made without departing from the concept of the present invention shall be included in the protection scope of the present invention.
Claims (10)
1. A train control device, comprising: the system comprises a communication board, a first main control board, a second main control board, a first input/output board, a second input/output board and a field bus;
the field bus is electrically connected with the communication board, the first main control board, the second main control board, the first input/output board and the second input/output board respectively;
the first input/output board and the second input/output board are electrically connected with the train equipment respectively.
2. The train control device of claim 1, wherein the communication board comprises: the system comprises a first communication controller, a second communication controller, a first communication processor, a second communication processor, a first bus controller and a second bus controller;
the fieldbus includes: a first bus and a second bus;
the first communication processor is electrically connected with the first communication controller, the second communication processor, the first bus controller and the second bus controller respectively, and the second communication processor is electrically connected with the second communication controller;
the first bus controller is electrically connected with the first bus, and the second bus controller is electrically connected with the second bus.
3. The train control device of claim 2, wherein the communication board further comprises: a third bus controller and a fourth bus controller;
the fieldbus further comprises: a third bus and a fourth bus;
the second communication processor is electrically connected with the third bus controller and the fourth bus controller respectively;
the third bus controller is electrically connected with the third bus, and the fourth bus controller is electrically connected with the fourth bus.
4. The train control device of claim 3, wherein the first master control board comprises: the system comprises a master control information converter, a master control processor, a first master control bus controller and a second master control bus controller;
the master control processor is electrically connected with the master control information converter, the first master control bus controller and the second master control bus controller respectively;
the first bus and the third bus are respectively electrically connected with the first master control bus controller;
the second bus and the fourth bus are respectively electrically connected with the second master control bus controller.
5. The train control device according to claim 3 or 4, wherein the first input-output board includes: the input/output information converter, the input/output processor, the first input/output bus controller and the second input/output bus controller;
the input/output processor is electrically connected with the input/output information converter, the first input/output bus controller and the second input/output bus controller respectively;
the first bus and the third bus are respectively electrically connected with the first input/output bus controller;
the second bus and the fourth bus are respectively electrically connected with the second input/output bus controller.
6. The train control device according to any one of claims 2 to 4, wherein the first communication controller and the second communication controller are of the type MVB controller or the Ethernet controller.
7. The train control device according to any one of claims 2 to 4, wherein the communication board further comprises: a memory;
at least one of the first communication processor and the second communication processor is electrically connected with the memory.
8. The train control device according to any one of claims 1 to 4, characterized by further comprising: a first power supply board and a second power supply board;
the input end of the first power panel and the input end of the second power panel are respectively electrically connected with a train power supply;
the output end of the first power panel is electrically connected with the communication panel, the first main control panel and the first input/output panel respectively;
the output end of the second power panel is electrically connected with the communication panel, the second main control panel and the second input/output panel respectively.
9. The train control device of any one of claims 1 to 4, wherein the communication board, the first master control board, the second master control board, the first input/output board, the second input/output board, and the field bus are disposed on a PCB backplane.
10. The train control device according to any one of claims 1 to 4, wherein hot plug connectors are provided between the field bus and the first main control board and between the field bus and the second main control board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020202981.9U CN211478918U (en) | 2020-02-24 | 2020-02-24 | Train control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020202981.9U CN211478918U (en) | 2020-02-24 | 2020-02-24 | Train control device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211478918U true CN211478918U (en) | 2020-09-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020202981.9U Active CN211478918U (en) | 2020-02-24 | 2020-02-24 | Train control device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211478918U (en) |
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2020
- 2020-02-24 CN CN202020202981.9U patent/CN211478918U/en active Active
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