CN101123592B

CN101123592B - MVB-CAN gateway based on ARM7 micro processor

Info

Publication number: CN101123592B
Application number: CN2007100114271A
Authority: CN
Inventors: 于跃; 李常贤; 宁寿辉; 赵国平; 杜振环
Original assignee: CNR Dalian Electric Traction R& D Center Co Ltd
Current assignee: CRRC Dalian R&D Co Ltd
Priority date: 2007-05-24
Filing date: 2007-05-24
Publication date: 2011-04-27
Anticipated expiration: 2027-05-24
Also published as: CN101123592A

Abstract

The invention discloses an MVB-CAN gateway based on an ARM7 core microprocessor. The invention is characterized in that the gateway comprises an MVB bus board card, a CAN bus board card, a CPU board card, a power supply board card and a backplane. The MVB board card, the CAN board card and the CPU board card are all connected by a backplane bus on the backplane, and the power supply board card provides working electric pressure for the MVB board card, the CAN board card and the CPU board card; the CAN board card is responsible for data collection and transmission of a CAN bus equipment; the MVB board card is responsible for data collection and domination of a MVB bus equipment; and the CPU board card is responsible for a central processing of the train bus and vehicle bus equipment data and the generation of ETHERNET and RS232 monitoring data flow. The gateway is a TCN network art in accord with an international standard, which is provided with the characteristics of a novel design and a high reliability etc. The gateway suits for a wide application in areas such as railroad industry etc in our country.

Description

MVB-CAN gateway based on ARM7 nuclear microprocessor

Technical field

The present invention relates to meet the MVB network control system of TCN standard, is the MVB network communication apparatus with CAN communication capacity.Be widely used in the industrial control field that real-times such as railroad train, subway train and urban rail transit vehicles are had relatively high expectations.

Background technology

Along with external advanced person's TCN network control technology high-speed development, the electric locomotive of China also begins to adopt successively the TCN technology, i.e. the collection of on-the-spot all signals all needs to collect on the centralized control computer by bus with control.But,, has realistic meaning for the technological innovation of railway locomotive industry so the MVB-CAN gateway just becomes the essential key equipment of MVB network control system because equipment such as some door control units, monitoring unit all adopt the CAN bus interface.

IEC61375-1 " TCN " (being called for short the TCN standard) is an international standard, also is the China railways industry standard.The TCN standard is the standard for Fieldbus that is this special application field design of railway systems, and it has formulated the communication system of an opening, thus make various rolling stocks can mutually interconnected extension, the equipment of different vendor can be interconnected.The TCN standard has defined multifunction vehicle bus MVB and two kinds of forms of wired train bus WTB altogether, and wherein the MVB bus connects the equipment in the vehicle, and the bus operating frequency is 1.5Mbit/s, and medium is twisted-pair feeder or optical fiber.The MVB bus provides two kinds of transmission services at link layer: (1) process data: periodic, and source addressable broadcast data; (2) message data: stage by demand the data message of target addressing.The MVB bus characteristics of TCN standard code are as shown in table 1.

The CAN bus is one of fieldbus of tool development prospect of generally acknowledging, and the ISO11898 standard is its international standard.The CAN bus standard is followed the ISO/OSI model, has adopted physical layer wherein, data link layer and application layer.The CAN bus is the serial communication network of distributed control of a kind of effective support and real-time control system, has outstanding reliability, real-time and flexibility.The bus characteristics of CAN standard code are as shown in table 2.

The main feature of table 1MVB bus

Characteristic	Multifunction vehicle bus MVB
		Bus structures	Fixed structure and device address
The bus medium	Be with the optical fiber (2000m, 2 equipment) of star coupling device based on the transformer-coupled multiple twin shielding conductor of twisted-pair feeder (20m, 32 equipment) (200m, 32 equipment) of RS-485
		Physically-redundant	The double physical medium
Signal form	The Manchester code that delimiter is arranged
		Signal data speed	1.5Mbit/s
Address section	Process data (logical address) and message data (physical address) all are 12 bit address

Physical address	Point-to-point and broadcasting
		Effective frame length	Be fixed as 16,32,64,128 or 256
Integrality	IEC60870 verification sequence and frame length inspection
		Medium distributes	Distribute by a bus master
Sovereignty shift	Transmit bus manager by token and become the bus master
		Bus master's redundancy	Sovereignty shift automatically, carry out redundancy check by the token transmission
The link layer service	The data that the process data periodic data is point-to-point by the sporadic data of data set message data of source addressable broadcast or broadcasting data messages monitoring data periodic data/sporadic data/address bus is managed

The main feature of table 2CAN bus

Characteristic	CAN
		Network configuration	Universal serial bus
Communication media	Twisted-pair feeder, optical fiber
		Communication mode	CSMA/CD
Signal data speed	1Mbit/s
		Addressing system	Broadcasting
The node number	64
		Transmission range	10km

The MVB-CAN gateway product of China railways industry employing at present all is external standard component, though the Related product of independent research is arranged, but all be simple substitution and substituting, do not form the MVB-CAN gateway that is not applied to the rolling stock industry with independent intellectual property right.So succeeding in developing of MVB-CAN gateway indicates that whole MVB-CAN switch technologies capture, and filled up the blank in domestic this field, make the TCN network control of China technical a new step.

Summary of the invention

The purpose of this invention is to provide a kind of novel MVB-CAN gateway, be mainly used in the MVB network control system of railroad train, subway train and city rail industry, the network equipment that connects the CAN bus interface, both had MVB process data function, message data function and bus management function, also had CAN link layer management function and application level function.

Technical solution of the present invention is achieved in that a kind of MVB-CAN gateway based on ARM7 nuclear microprocessor, it is characterized in that comprising MVB integrated circuit board, CAN integrated circuit board, CPU board card, power supply integrated circuit board and backboard.Described MVB integrated circuit board, CAN integrated circuit board and CPU board card all are to be connected by the core bus on the backboard, and the power supply integrated circuit board provides operating voltage for MVB integrated circuit board, CAN integrated circuit board and CPU board card; Described CAN integrated circuit board is responsible for the data acquisition and the transmission of CAN bus apparatus; Described MVB integrated circuit board is responsible for the data acquisition and the control of MVB bus apparatus; The central authorities that described CPU board card is responsible for CAN bus and MVB bus apparatus data handle and generate ETHERNET and RS232 monitor data stream.

Described CAN bus integrated circuit board comprises that fpga logic processor, CAN protocol controller, CAN isolate optocoupler and CAN bus transceiver.Described device data stream is sent to the fpga logic processor from core bus and is converted into link packet with the CAN protocol controller, isolate the signal level that optocoupler becomes isolation by CAN, be modulated into differential signal through the CAN bus transceiver and be sent to the CAN bus and get on; Described CAN bus integrated circuit board can also receive the transmission data on the CAN bus, passes back to after treatment on the core bus of backboard.

Described MVB bus integrated circuit board comprises MVB RAM Shared, MVB protocol controller, MVB bus driver and MVB difference filter.Described device data stream allows through the MVB protocol controller from core bus, imports the MVB RAM Shared into, reads in then in the MVB protocol controller, by the Signal Spacing adjustment of MVB bus driver and MVB difference filter, is sent to vehicle bus and gets on again; Described MVB bus integrated circuit board can also receive the transmission data on the vehicle bus, passes back to after treatment on the core bus of backboard.

Described cpu bus integrated circuit board comprises central processing unit, Ethernet protocol controller and RS232 protocol controller.Described central processing unit transmits CAN bus and MVB bus data stream respectively, core bus through backboard imports CAN bus integrated circuit board and MVB bus integrated circuit board into, central processing unit generates the data flow that is used for the rail vehicle diagnostic analysis with the data message of gathering simultaneously, from Ethernet and the output of RS232 interface.

Described MVB protocol controller reads MVB process data, message data or the monitoring data of RAM Shared with inquiry mode, be converted into Manchester coded signal, import into and form the standard electrical signal in the MVB bus driver, perhaps will be from Manchester coded signal of MVB bus driver, resolve to the standard signal data, write RAM Shared.

Described MVB bus driver will be converted into the differential signal of standard from Manchester signal of MVB protocol controller, pass to the MVB network through the MVB difference filter, perhaps will be converted into the discernible Manchester of MVB protocol controller signal from the filter difference signal of MVB network.

Described fpga logic processor is the level signal that the application data stream from core bus is converted into time-sharing multiplex, send into the CAN protocol controller, perhaps will be converted into application data stream and be sent to core bus from the time-sharing multiplex message of CAN protocol controller.

Described CAN protocol controller is the level signal that the data flow from the fpga logic processor is converted into the link packet form, send into CAN and isolate optocoupler, perhaps will isolate the link packet of optocoupler from CAN, the data flow that is converted into standard is sent to the fpga logic processor.

Described CAN bus transceiver is that the isolation level signal of will isolate optocoupler from CAN is converted into the differential level signal and is sent on the CAN bus, perhaps will be from the differential signal on the CAN bus, and be converted into level signal and be sent to CAN and isolate optocoupler.

Described core bus structure is combined into an integral device with various integrated circuit boards, and the power supply integrated circuit board adopts modularized design that the power supply of whole test platform is provided.

Native system is that a kind of MVB-CAN network control technology based on IEC61375-1 and ISO11898 standard is applied to railway systems control field, has modern design, high reliability, high flexibility and characteristics with low cost, is with a wide range of applications.

Description of drawings

Fig. 1 is a structured flowchart of the present invention;

Fig. 2 is a CPU board card structure block diagram of the present invention;

Fig. 3 is a CAN bus board card structure block diagram of the present invention;

Fig. 4 is the structured flowchart of MVB bus integrated circuit board of the present invention;

Fig. 5 is ARM and peripheral circuit interface circuit figure thereof in the CPU board card of the present invention;

Fig. 6 is the circuit connection diagram of fpga logic processor and CAN bus protocol controller in the CAN bus integrated circuit board of the present invention;

Fig. 7 is the circuit connection diagram of MVB protocol controller in the MVB bus integrated circuit board of the present invention;

Fig. 8 is the circuit connection diagram of MVB bus driver and MVB difference filter in the MVB bus integrated circuit board of the present invention;

Fig. 9 is a network topological diagram of the present invention;

Fig. 1 is a specification digest accompanying drawing of the present invention.

Among the figure: 1, MVB bus integrated circuit board, 2, CAN bus integrated circuit board, 3, the CPU board card, 4, power supply integrated circuit board, 5, backboard, 6, central processing unit, 7, Ethernet protocol controller, 8, the RS232 protocol controller, 9, the fpga logic processor, 10, CAN protocol controller, 11, CAN isolates optocoupler, 12, the CAN bus transceiver, 13, MVB RAM Shared, 14, MVB protocol controller, 15, the MVB bus driver, 16, the MVB difference filter.

Embodiment

Shown in Fig. 1～9, a kind of MVB-CAN gateway based on ARM7 nuclear microprocessor, it is characterized in that comprising MVB bus integrated circuit board 1, CAN bus integrated circuit board 2, CPU board card 3, power supply integrated circuit board 4 and backboard 5, described MVB bus integrated circuit board 1, CAN bus integrated circuit board 2 are connected by the core bus on the backboard 5 with CPU board card 3; Described power supply integrated circuit board 4 is installed on the backboard 5 unifies power supply to MVB bus integrated circuit board 1, CAN bus integrated circuit board 2 and CPU board card 3; Described MVB bus integrated circuit board 1 is responsible for gathering and controlling the data flow of equipment on the MVB bus; Described CAN bus integrated circuit board 2 is responsible for gathering and controlling the data flow of equipment on the CAN bus; The central authorities that described CPU board card 1 is responsible for CAN bus and MVB bus apparatus data handle and generate ETHERNET and RS232 monitor data stream.

MVB bus integrated circuit board 1 comprises MVB RAM Shared 13, MVB protocol controller 14, MVB bus driver 15 and MVB difference filter 16.Described device data stream allows through MVB protocol controller 14 from the core bus of backboard 5, import MVB RAM Shared 13 into, read in then in the MVB protocol controller 14, by the Signal Spacing adjustment of MVB bus driver 15 and MVB difference filter 16, be sent to vehicle bus and get on again; Described MVB bus integrated circuit board can also receive the transmission data on the vehicle bus, passes back to after treatment on the core bus of backboard 5.MVB difference filter 16 is the high-frequency signal filter, has the high-frequency interferencing signal inhibitory action, and EMC satisfies the EN50155 standard.

CAN bus integrated circuit board 2 comprises that fpga logic processor 9, CAN protocol controller 10, CAN isolate optocoupler 11 and CAN bus transceiver 12.The core bus of described device data by backboard 5 imports into and is converted into the time-sharing multiplex data flow in the fpga logic processor 9, form link packet by CAN protocol controller 10 again, isolate optocoupler 11 Signal Spacing through CAN, in CAN bus transceiver 12, become differential signal and be sent to the CAN bus and get on; Described CAN bus integrated circuit board can also receive the transmission data on the CAN bus, passes back to after treatment on the core bus of backboard 5.

Cpu bus integrated circuit board 3 comprises central processing unit 6, Ethernet protocol controller 7 and RS232 protocol controller 8.Described central processing unit 6 transmits CAN bus and MVB bus data stream respectively, core bus through backboard 5 imports MVB bus integrated circuit board 1 and CAN bus integrated circuit board 2 into, central processing unit 6 generates the data flow that is used for the rail vehicle diagnostic analysis with the data message of gathering simultaneously, externally exports through ethernet controller 7 and RS232 controller 8 respectively.In addition, configuration effort power supply, real-time clock and reset circuit are gone back in central processing unit 6 peripheries.

Wherein MVB protocol controller 14 is that MVBC01, MVB bus driver 15 are 82C250 for SJA1000, CAN isolate optocoupler 11 for 6N137, CAN bus transceiver 12 for Sartan2-100, CAN protocol controller 10 for CM04RC04, fpga logic processor 9 for LCT1485, MVB difference filter 16; Central processing unit 6 is the core of whole system for the ARM7 master controller, and it is made up of two parts: i.e. hardware and software.The effect of hardware mainly is the exchanges of being responsible for the processing of the central authorities of CAN bus and MVB bus data and two kinds of bus data streams, and the generation of Ethernet and RS232 data flow.Software is then finished network protocol stack function and application controlled function.CAN protocol controller 10 is CAN server devices, the application data that it is responsible for will transmitting in the fpga logic processor 9 changes into the link packet data flow of CAN procotol defined and delivers to CAN isolation optocoupler 11 formation electrical isolation signals, perhaps CAN being isolated the electrical isolation signal resolution that optocoupler 11 sends here becomes normal data and deposits it in fpga logic processor 9, cause interrupt request singal thereupon, read for central processing unit 6.Be connected to core bus between each integrated circuit board and the integrated circuit board, this core bus has been followed the external memory access bus of standard, the core bus socket is the physical structure that above-mentioned integrated circuit board is coupled together, it carries out cabling and level match with the peace of the signal between integrated circuit board according to special requirement, and the 110V external power power supply interface of whole M VB-CAN gateway is provided simultaneously.Described back plate design is that the core bus signal has high reliability, good flexibility energy and Scalable Performance according to the characteristics design of the on-the-spot electric circumstance of railway systems; What power supply integrated circuit board 4 adopted is the method for modularized design, and the core power module of use is produced the power module chip for Japanese COSEL company, and purpose is that+110V voltage transitions is+5V power supply, supplies with that integrated circuit board uses in the cabinet, is a very stable power.

By the constructed MVB-CAN gateway of above-mentioned four integrated circuit boards, be connected with the inner CAN network equipment of train, the train information on the CAN network equipment can carry out the exchange of data flow with the MVB network like this.If need more CAN network in the train, just need the such equipment of a cover so in each CAN network.The canonical system framework map is formed the MVB-CAN gateway by MVB bus integrated circuit board, CAN bus integrated circuit board and CPU board card as shown in Figure 9, connects MVB network and CAN network simultaneously.The CAN network also comprises the collection performance element of integrated circuit boards such as DX, the AX composition CAN network that has the CAN bus interface.CAN bottom integrated circuit board is digital quantity and analog quantity integrated circuit board, and it gives CAN bus integrated circuit board with data, generates CAN data format message, is sent on other equipment on the MVB bus by CPU board card and MVB bus integrated circuit board then.Also be the integrated circuit board that the data of other equipment of MVB is sent to the CAN bottom conversely simultaneously.The data flow of whole system as mentioned above.Certainly, can also be with a lot of other equipment according to the requirement of MVB network system, such as central control unit, intelligent display unit, traction braking unit, compressor unit etc.

Claims

1. MVB-CAN gateway based on ARM7 nuclear microprocessor, it is characterized in that comprising MVB bus integrated circuit board (1), CAN bus integrated circuit board (2), CPU board card (3), power supply integrated circuit board (4) and backboard (5), described MVB bus integrated circuit board (1), CAN bus integrated circuit board (2) and CPU board card (3) are connected by the core bus on the backboard (5); Described power supply integrated circuit board (4) is installed in backboard (5) and upward MVB bus integrated circuit board (1), CAN bus integrated circuit board (2) and CPU board card (3) is unified power supply; Described MVB bus integrated circuit board (1) is responsible for gathering and controlling the data flow of equipment on the MVB bus, described MVB bus integrated circuit board comprises MVB RAM Shared (13), MVB protocol controller (14), MVB bus driver (15) and MVB difference filter (16), device data stream on the described MVB bus allows through MVB protocol controller (14) from core bus, import MVB RAM Shared (13) into, read in then in the MVB protocol controller (14), by the Signal Spacing adjustment of MVB bus driver (15) and MVB difference filter (16), be sent to vehicle bus and get on again; Described MVB bus integrated circuit board can also receive the transmission data on the vehicle bus, passes back to after treatment on the core bus of backboard (5); Described CAN bus integrated circuit board (2) is responsible for gathering and controlling the data flow of equipment on the CAN bus, described CAN bus integrated circuit board comprises fpga logic processor (9), CAN protocol controller (10), CAN isolates optocoupler (11) and CAN bus transceiver (12), device data stream on the described CAN bus is sent to the fpga logic processor (9) and at CAN protocol controller (10) from core bus and is converted into link packet, isolate the signal level that optocoupler (11) becomes isolation by CAN, be modulated into differential signal through CAN bus transceiver (12) and be sent to the CAN bus and get on; Described CAN bus integrated circuit board can also receive the transmission data on the CAN bus, passes back to after treatment on the core bus of backboard (5); The central authorities that described CPU board card (1) is responsible for CAN bus and MVB bus apparatus data handle and generate ETHERNET and RS232 monitor data stream.

2. MVB-CAN gateway according to claim 1, it is characterized in that described cpu bus integrated circuit board comprises central processing unit (6), Ethernet protocol controller (7) and RS232 protocol controller (8), described central processing unit (6) transmits CAN bus and MVB bus data stream respectively, core bus through backboard (5) imports MVB bus integrated circuit board (1) and CAN bus integrated circuit board (2) into, central processing unit (6) generates the data flow that is used for the rail vehicle diagnostic analysis with the data message of gathering simultaneously, from Ethernet and the output of RS232 interface.

3. MVB-CAN gateway according to claim 2, it is characterized in that described fpga logic processor (9) is the level signal that the application data stream from core bus is converted into time-sharing multiplex, send into CAN protocol controller (10), perhaps will be converted into application data stream and be sent to core bus from the time-sharing multiplex message of CAN protocol controller (10).

4. MVB-CAN gateway according to claim 3, it is characterized in that described CAN protocol controller is the level signal that the data flow from the fpga logic processor is converted into the link packet form, send into CAN and isolate optocoupler, perhaps will isolate the link packet of optocoupler from CAN, the data flow that is converted into standard is sent to the fpga logic processor.

5. MVB-CAN gateway according to claim 4, it is characterized in that described MVB protocol controller (14) reads MVB process data, message data or the monitoring data of MVB RAM Shared (13) with inquiry mode, be converted into Manchester coded signal, import into and form the standard electrical signal in the MVB bus driver (15), perhaps will be from Manchester coded signal of MVB bus driver (15), resolve to the standard signal data, write MVB RAM Shared (13).

6. MVB-CAN gateway according to claim 5, it is characterized in that described MVB bus driver (15) will be converted into the differential signal of standard from Manchester signal of MVB protocol controller (14), pass to the MVB network through MVB difference filter (16), perhaps will be converted into the discernible Manchester of MVB protocol controller (14) signal from the filter difference signal of MVB network.