CN109298665A - A kind of train apparatus cabin safe condition processing unit - Google Patents
A kind of train apparatus cabin safe condition processing unit Download PDFInfo
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- CN109298665A CN109298665A CN201811306284.1A CN201811306284A CN109298665A CN 109298665 A CN109298665 A CN 109298665A CN 201811306284 A CN201811306284 A CN 201811306284A CN 109298665 A CN109298665 A CN 109298665A
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- 238000012545 processing Methods 0.000 title claims abstract description 33
- 238000004891 communication Methods 0.000 claims abstract description 30
- 230000005540 biological transmission Effects 0.000 claims description 16
- 230000008878 coupling Effects 0.000 claims description 7
- 238000010168 coupling process Methods 0.000 claims description 7
- 238000005859 coupling reaction Methods 0.000 claims description 7
- 230000005611 electricity Effects 0.000 claims description 6
- 239000003990 capacitor Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 238000013461 design Methods 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 5
- 238000001914 filtration Methods 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 230000008447 perception Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0428—Safety, monitoring
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/24—Pc safety
- G05B2219/24215—Scada supervisory control and data acquisition
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Train Traffic Observation, Control, And Security (AREA)
Abstract
The present invention relates to a kind of train apparatus cabin safe condition processing units, its innovative point is: including data processing module and communication module, the data processing module includes power supply and CPU module, the communication module includes D013 interface module, the first RS485 interface circuit and the 2nd RS485 interface circuit, the power supply is electrically connected with CPU module and D013 interface module, the connecting pin communication connection corresponding with CPU module respectively of the D013 interface module, the first RS485 interface circuit and the 2nd RS485 interface circuit.The present invention can analyze, handle and judge that collected train apparatus cabin key fastener state and its suffered extraneous hit generate vibration.
Description
Technical field
The present invention relates to a kind of safe condition processing units, and in particular to a kind of train apparatus cabin safe condition processing dress
It sets.
Background technique
Under train operation state, running environment is severe.It can be generated since the speed of service of train is fast, and in operational process
Vibration and noise, therefore equipment compartment key fastener is easy to loosen/fall off, equipment compartment is easy by from extraneous not jljl
The shock or damage of body directly affect the driving safety state of train.These structural loosenings/falling off/damage must be in time
It was found that and place under repair, to guarantee that train is in good use state always, therefore, the safety problem of equipment compartment is very heavy
It wants.In order to ensure the safety of equipment compartment, urgent need design is a set of can to analyze, handle and judge that collected train apparatus cabin is closed
Key fastener state and equipment compartment are by the train apparatus cabin safe condition processing unit vibrated caused by extraneous hit.
Summary of the invention
The object of the present invention is to provide one kind to analyze, handle and judges that collected train apparatus cabin key fastens
Part state and its suffered extraneous train apparatus cabin safe condition processing unit for hitting generation vibration.
In order to achieve the above object, the technical scheme is that a kind of train apparatus cabin safe condition processing unit,
Innovative point is: including data processing module and communication module, the data processing module includes power supply and CPU module, described
Communication module includes D013 interface module, the first RS485 interface circuit and the 2nd RS485 interface circuit, the power supply and CPU mould
Block and the electrical connection of D013 interface module, the D013 interface module, the first RS485 interface circuit and the 2nd RS485 interface circuit
Connecting pin communication connection corresponding with CPU module respectively.
It in the above-mentioned technical solutions, further include terminal device, the 2nd RS485 interface circuit passes through radio transmission apparatus
It is connect with cloud server with terminal equipment in communication.
In the above-mentioned technical solutions, the data processing module further includes MVB controller reset circuit, and the power supply is
The power supply of MVB controller reset circuit, and the connecting pin electrical connection corresponding with CPU module of MVB controller reset circuit.
In the above-mentioned technical solutions, the data processing module further includes extension read-only memory circuit, and the extension is only
Read memory circuit connecting pin electrical connection corresponding with CPU module.
In the above-mentioned technical solutions, the power supply includes power protecting circuit, level-one filter circuit, DC-DC module, low frequency
Filter circuit, high-frequency filter circuit and coupling circuit, the input terminal of the power protecting circuit are direct current 24V voltage connection
The output end of son, power protecting circuit is electrically connected with the input terminal of level-one filter circuit, the output end and DC- of level-one filter circuit
The input terminal of DC module is electrically connected, and the output end of DC-DC module is electrically connected with the input terminal of low-frequency filter circuit, High frequency filter electricity
The input terminal on road is electrically connected with the output end of low-frequency filter circuit, and the output end of high-frequency filter circuit is electrically connected with coupling circuit,
The output end of the high-frequency filter circuit is direct current 3.3V voltage output connection terminal.
In the above-mentioned technical solutions, the D013 interface module includes MVB controller component and MVB physical interface circuit,
The CPU module is electrically connected with the input terminal of MVB controller component, the output of MVB physical interface circuit and MVB controller component
End electrical connection, the output end of the MVB physical interface circuit are MVB bus connection terminal.
Good effect possessed by the present invention is: after using train apparatus cabin safe condition processing unit of the invention, by
It include data processing module and communication module in the present invention, the data processing module includes power supply and CPU module, the communication
Module includes D013 interface module, the first RS485 interface circuit and the 2nd RS485 interface circuit, the power supply and CPU module and
The electrical connection of D013 interface module, the D013 interface module, the first RS485 interface circuit and the 2nd RS485 interface circuit difference
The communication connection of corresponding with CPU module connecting pin, the first RS485 interface circuit network node communication company corresponding with train
It connects, in use, if the fastener of equipment compartment occurs to loosen or fall off and equipment compartment apron board and bottom are hit by foreign matter, it will
The generated vibration signal that the electric signal and equipment compartment of fastener state aware are hit by foreign matter, which is sent to CPU module, to be divided
Analysis, processing and judgement, and treated electric signal is sent by the first RS485 interface circuit to the network node of train, by net
Network node obtains information and is fed back, and the present invention is not only simple in structure, and can analyze, handles and judge collected set
Standby cabin fastener status signal and its vibration signal that generation is hit by foreign matter, the driving safety in real-time monitoring equipment cabin.
Detailed description of the invention
Fig. 1 is a kind of system structure diagram of specific embodiment of the invention；
Fig. 2 is the circuit diagram of CPU module in Fig. 1；
Fig. 3 is extension read-only memory circuit schematic diagram in Fig. 1；
Fig. 4 is the circuit diagram of power supply in Fig. 1；
Fig. 5 is the schematic diagram of two groups of RS485 interface circuits in Fig. 1；
Fig. 6 is the circuit diagram of D013 interface module in Fig. 1；
Fig. 7 is MVB controller reset circuit in Fig. 1.
Specific embodiment
Below in conjunction with attached drawing and the embodiment provided, the present invention is further illustrated, and however, it is not limited to this.
As shown in Fig. 1,2,3,4,5,6,7, a kind of train apparatus cabin safe condition processing unit, including data processing module
And communication module, the data processing module include power supply 1 and CPU module 2, the communication module include D013 interface module 3,
First RS485 interface circuit 4 and the 2nd RS485 interface circuit 5, the power supply 1 are electrically connected with CPU module 2 and D013 interface module 3
It connects, the D013 interface module 3, the first RS485 interface circuit 4 and the 2nd RS485 interface circuit 5 are corresponding to CPU module 2 respectively
Connecting pin communication connection.
As shown in Figure 1, further including terminal device 6, the 2nd RS485 interface circuit 5 passes through radio transmission apparatus and cloud
Server and terminal device 6 is held to communicate to connect.The fastener of acquisition is loosened/fallen off signal and foreign matter hits signal by second
RS485 interface circuit 5 is sent to cloud by radio transmission apparatus F-BOX, is then transferred in control by Internet again
The heart is sent to mobile phone by 4G net, is not necessarily to complex configurations, and application is simple and convenient, the connection management of more remote equipments of realization,
The functions such as data acquisition, storage and transmission.The terminal device 6 can be computer or mobile phone.
As shown in Fig. 2, the module is CPU module, select the STC8A8K32S4A12 single-chip microcontroller of STC series as in control
The basic performance of the CPU of the heart, the single-chip microcontroller are as follows:
Operating voltage: 2.0V-5.5V
Flash program memory: 32K, refreshable 100,000 times
Extend SRAM memory: 8K
EEPROM:32K, refreshable 100,000 times
12 high-speed ADCs: 15 tunnels
Built-in high accurate clock: 24MHZ is adjustable
I/O mouthfuls of quantity: 59
Wherein 19,21 two pins are connected with the direct current 3.3V that power supply 1 exports, for providing 3.3V voltage to single-chip microcontroller；51,52
(RXD3/TXD3) two pins are used to carry out data communication with D013 interface module；64,3(RXD2/TXD2) two pins with
U2 communication in first RS485 interface circuit 4；27,28(RXD/TXD) the 2nd RS485 interface electricity of two pins and F-BOX
U3 communication in road 5；23,24 two pins are separately connected two LED light, show or alarm use for debugging routine；13,14 liang
It is a to draw one and connect external 24MHZ crystal oscillator；36 pins/RST is connected with DO13 interface module reset terminal/RESET, for multiple in a program
Position D013 interface module.35 pins/INT be interrupt foot and D013 interface module /INT is connected.
As shown in figure 3, the data processing module further includes extension read-only memory circuit 8, the read-only storage of extension
The connecting pin electrical connection corresponding with CPU module 2 of device circuit 8.The 55 of CPU module, 56,57 three pins are read-only for connecting extension
Memory U4, the extension read-only memory circuit 8 can be used to extend other functions of different CPU modules.
As shown in figure 4, the power supply 1 includes power protecting circuit 11, level-one filter circuit 12, DC-DC module 13, low frequency
Filter circuit 14, high-frequency filter circuit 15 and coupling circuit 16, the input terminal of the power protecting circuit 11 are direct current 24V voltage
The output end of connection terminal, power protecting circuit 11 is electrically connected with the input terminal of level-one filter circuit 12, level-one filter circuit 12
Output end be electrically connected with the input terminal of DC-DC module 13, the input of the output end of DC-DC module 13 and low-frequency filter circuit 14
End electrical connection, the input terminal of high-frequency filter circuit 15 are electrically connected with the output end of low-frequency filter circuit 14, high-frequency filter circuit 5
Output end is electrically connected with coupling circuit 16, and the output end of the high-frequency filter circuit 5 is direct current 3.3V voltage output connection terminal.
Input direct-current 24V voltage between the VIN+ and VIN- of the power protecting circuit 11, by the change of DC-DC module 13
After changing, output end exports direct current 3.3V voltage, provides 3.3V voltage for entire control circuit board.
URB2403YMD-10WR3 is DC-DC module, it is the core of the circuit.In the power protecting circuit 11
FU1 is used for overcurrent protection, and second tube sheet D1 is for preventing 24V input power reversed, to protect DC-DC module.
Circuit interference is the eternal project of circuit design, and power supply is the main entrance of circuit board interference, therefore designs power supply
It is anti-interference particularly significant.To 24V input power devise 3 weight it is anti-interference, the capacitor C16 in level-one filter circuit 12 can be real
Existing primary filtering, transient state inhibit RV1 for inhibiting high-frequency and high-voltage disturbing pulse, by inductance L1, C14, C15 at ㄇ type filter
Device inhibits residual interference, and capacitor C18 and C19 realizes low frequency filtering, the height to 3.3V voltage in the low-frequency filter circuit 14
Capacitor C5 and capacitor C6 in frequency filter circuit 15 carry out High frequency filter, the coupling circuit to the 3.3V voltage after low frequency filtering
Capacitor C7, C8, C11, C12, C13, C9, C10 in 16 is for the uncoupling between chip power and ground.
As shown in figure 5, the module is the first RS485 interface circuit 4 and the 2nd RS485 interface circuit 5, wherein U3 is used as
Data communication between CPU and F-BOX；U2 is used for the data communication of CPU and 5 unit group safe condition intelligent perception system.
MAX3483EESA is RS485 interface module, it uses 3.3V power supply, has +/- 15KV static electricity on human body protection
Function, transmission rate are up to 2.5Mbps.Z1/Z2 is two-way 30KV electrostatic protection device, and R5, R6, R7 and R8, R9, R10 are inclined
Piezoresistance.
As shown in fig. 6, the D013 interface module 3 includes MVB controller component 31 and MVB physical interface circuit 32, institute
It states CPU module 2 to be electrically connected with the input terminal of MVB controller component 31, MVB physical interface circuit 32 and MVB controller component 31
Output end electrical connection, the output end of the MVB physical interface circuit 32 is MVB bus connection terminal.
The module is for the communication between CPU and MVB bus.D013 is that a process data and message data are optional
MVB controller component, wherein physical transmission medium can be selected as ESD or EMD by user, and wherein ESD is for short distance
Single line structure (RS-485) dielectric from (transmission range≤20.0 m) transmission；EMD be for middle distance (transmission range≤
200.0m) transformer coupled tunnel dielectric.With the continuous development of MVB technology, ESD has been intended to no longer use at present,
Mainly based on EMD, the design is transmitted using EMD.EMD can be divided into " Pang Badi " formula and " Siemens " formula at present, they two
Person has biggish difference, and interoperability also has biggish difference.
It has parallel, serial and tri- kinds of interfaces of SPI.MVB controller and line transceiver are by the test of integrated and pattern, symbol
Close TCN standard.
Mode0(X1-26) define the type of MVB transmission medium, this project using in electrical apart from medium EMD,
It is " 1 " by its set.Mode1(X1-27) and Mode2(X1-28) common definition MVB controller and the data of SCM system pass
Defeated mode, we use serial transmission mode, therefore by Mode1 setting in " 1 ", Mode2 is setting in " 0 ".
X1-1, X1-2, X1-23, X1-24 ground connection, X1-7, X1-8, X1-17, X1-18 connect 3.3V power supply.
RXD(X1-3) and TXD(X1-19) be serial communication receive/send pin, P0.0 the and P0.1 phase of it and single-chip microcontroller
Even.
Due to being configured as main interface (SERVER), HOLD_TX(X1-4) it should be set as " 0 ", and HOLD_RX
(X1-20) hanging.
BAUDS0 [2,1,0] these three pins define baud rate, because the baud rate generated is fixed as 9600bps,
By BAUDS0 (X1-5) set " 0 ", BAUDS1 (X1-6) set " 1 ", BAUDS2 (X1-9) set " 0 ".Due to without using outside
Crystal oscillator, therefore external clock need to be inputted RXTXC (X1-10) set " 0 ".
Due to using EMD transmission medium, to the interface for not using other media in the Interface design of X2, circuit is simplified.
EMI electromagnetic interference is considered 1,2,9,10,17, the 18 of X2 and is designed, and accesses 4.7nF/ between these shielded layers and ground
The Y type capacitor of 250VAC, while noise can be reduced.
As shown in fig. 6, according to the MVB connector requirement in International Electrotechnical Commission IEC61375-1 for EMD medium, often
A equipment should use the connector of two 9 needle DB-9 to access.Two connectors are respectively designated as DB9/M and DB9/F.In DB9/M
The impedance matching resistor in indirect 120 Europe of 6,7 pins has also connect 120 ohm of impedance matching electricity in DB9/F between 8,9 pins
Resistance.
As shown in fig. 7, the data processing module further includes MVB controller reset circuit 7, the power supply 1 is MVB control
Device reset circuit 7 is powered, and the connecting pin electrical connection corresponding with CPU module 2 of MVB controller reset circuit 7.
/ RESET(X1-21) connection single-chip microcontroller P3.7, for resetting MVB controller, safely stop MVB bus on institute
Some activities.+ 3.3V is the DC power supply energization input of controller, is connected with the power module output on circuit board.
According to IEC61375-1 " the 1st part of Railway Electric equipment --- train bus-line: Train Communication Network " standard, column
Vehicle communication network (TCN) will be divided into the train grade communication network that is used to connect each section and can dynamically organize into groups: wired train bus WTB
With the vehicle communication network for connecting fixed equipment in vehicle: double-unit traction controller.TCN by each compartment network section
Point forms, and is linked into an integrated entity between each network node by WTB, equipment various in compartment are connected into one by MVB by each network node
A imformosome.Various equipment exchange information by MVB in compartment, and the information which reports is sent out by the node to WTB
It delivers letters breath.The present invention is used for the safe condition in monitoring device cabin.
First RS485 interface circuit of the present invention network node communication connection corresponding with train, in use, if equipment
The fastener in cabin occurs to loosen or fall off and equipment compartment apron board and bottom are hit by foreign matter, then by fastener state aware
The generated vibration signal that electric signal and equipment compartment are hit by foreign matter, which is sent to CPU module, to be analyzed, handled and is judged, and
Treated electric signal is sent by the first RS485 interface circuit to the network node of train, information is obtained simultaneously by network node
It is fed back, the present invention is not only simple in structure, and can analyze, handles and judge collected equipment compartment fastener state letter
Number and its by foreign matter hit generate vibration signal, the driving safety in real-time monitoring equipment cabin.
Remote information transmission scheme of the present invention has the following characteristics that
1, remote data monitoring is realized by computer pc client, cell phone application and webpage, to abnormal data real-time display.
2, exception information can be sent by mobile terminal APP, can also be configured short message transmission or wechat is sent.
3, historgraphic data recording, the data for the monitoring point that acquisition and record are registered, and the data of support list curve are supported
It shows and commonly statisticallys analyze, facilitate the history run state of tracking equipment.And suspension is supported to cache, network recovery is mended automatically
Together, guarantee that historical data is not lost completely.
4, the operating parameter, state etc. of remote viewing device, can check equipment operation condition at any time.
It follows that equipment compartment fault status information is sent to cloud data center by intelligent wireless transmission device, it is raw
Teledata monitoring can be realized by computer pc client, cell phone application and webpage by producing the agent authorizeds such as factory, Railway Bureau, to exception
Signal carries out record and real-time display, while maintenance personal's mobile phone can be sent to by short message and wechat mode, informs abnormal shape
State and position to be repaired timely and effectively maintain the safe condition of equipment compartment, the safety of guarantee railway.
Taking the above-mentioned ideal embodiment according to the present invention as inspiration, through the above description, relevant staff is complete
Various changes and amendments can be carried out without departing from the scope of the technological thought of the present invention' entirely.The technology of this invention
Property range is not limited to the contents of the specification, it is necessary to which the technical scope thereof is determined according to the scope of the claim.
Claims (6)
1. a kind of train apparatus cabin safe condition processing unit, it is characterised in that: including data processing module and communication module, institute
Stating data processing module includes power supply (1) and CPU module (2), and the communication module includes D013 interface module (3), first
RS485 interface circuit (4) and the 2nd RS485 interface circuit (5), the power supply (1) and CPU module (2) and D013 interface module
(3) it is electrically connected, the D013 interface module (3), the first RS485 interface circuit (4) and the 2nd RS485 interface circuit (5) are respectively
Connecting pin communication connection corresponding with CPU module (2).
2. train apparatus cabin safe condition processing unit according to claim 1, it is characterised in that: further include terminal device
(6), the 2nd RS485 interface circuit (5) passes through radio transmission apparatus and cloud server and terminal device (6) communication link
It connects.
3. train apparatus cabin safe condition processing unit according to claim 1, it is characterised in that: the data processing mould
Block further includes MVB controller reset circuit (7), and the power supply (1) is MVB controller reset circuit (7) power supply, and MVB is controlled
Device reset circuit (7) connecting pin electrical connection corresponding with CPU module (2).
4. train apparatus cabin safe condition processing unit according to claim 1, it is characterised in that: the data processing mould
Block further includes extension read-only memory circuit (8), extension read-only memory circuit (8) connection corresponding with CPU module (2)
End electrical connection.
5. train apparatus cabin safe condition processing unit according to claim 1, it is characterised in that: power supply (1) packet
Include power protecting circuit (11), level-one filter circuit (12), DC-DC module (13), low-frequency filter circuit (14), High frequency filter electricity
Road (15) and coupling circuit (16), the input terminal of the power protecting circuit (11) are direct current 24V voltage connection, and power supply is protected
The output end of protection circuit (11) is electrically connected with the input terminal of level-one filter circuit (12), the output end of level-one filter circuit (12) with
The input terminal of DC-DC module (13) is electrically connected, the output end of DC-DC module (13) and the input terminal electricity of low-frequency filter circuit (14)
Connection, the input terminal of high-frequency filter circuit (15) are electrically connected with the output end of low-frequency filter circuit (14), high-frequency filter circuit (5)
Output end be electrically connected with coupling circuit (16), the output end of the high-frequency filter circuit (5) is that direct current 3.3V voltage output connects
Connecting terminal.
6. train apparatus cabin safe condition processing unit according to claim 1, it is characterised in that: the D013 interface mould
Block (3) includes MVB controller component (31) and MVB physical interface circuit (32), the CPU module (2) and MVB controller component
(31) input terminal electrical connection, MVB physical interface circuit (32) is electrically connected with the output end of MVB controller component (31), described
The output end of MVB physical interface circuit (32) is MVB bus connection terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811306284.1A CN109298665A (en) | 2018-11-05 | 2018-11-05 | A kind of train apparatus cabin safe condition processing unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811306284.1A CN109298665A (en) | 2018-11-05 | 2018-11-05 | A kind of train apparatus cabin safe condition processing unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109298665A true CN109298665A (en) | 2019-02-01 |
Family
ID=65146539
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811306284.1A Withdrawn CN109298665A (en) | 2018-11-05 | 2018-11-05 | A kind of train apparatus cabin safe condition processing unit |
Country Status (1)
| Country | Link |
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| CN (1) | CN109298665A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110979395A (en) * | 2020-01-02 | 2020-04-10 | 中车青岛四方车辆研究所有限公司 | MVB bus termination device and train network control system |
-
2018
- 2018-11-05 CN CN201811306284.1A patent/CN109298665A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110979395A (en) * | 2020-01-02 | 2020-04-10 | 中车青岛四方车辆研究所有限公司 | MVB bus termination device and train network control system |
| CN110979395B (en) * | 2020-01-02 | 2021-08-10 | 中车青岛四方车辆研究所有限公司 | MVB bus termination device and train network control system |
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Application publication date: 20190201 |