CN102624533B - Vehicle level Ethernet switching device for train - Google Patents

Abstract

The invention discloses a train vehicle level Ethernet switching device. The device consists of switching module, EEPROM module, SPI module, PLL clock module, crystal oscillator module, MDI/MDI-X automatic conversion module, power saving mode module, network transformer module, 10/100MBASE-TX adaptive M12 network interface module, Ethernet It consists of a network interface protection module, an LED indicator module, a reset module and a working power supply module. Advantages of the present invention: the device of the present invention is mainly used in data transmission and data exchange of train networks such as rail transit train communication control systems, train fault diagnosis systems, and train passenger information systems. A vehicle-level Ethernet switching device specially designed for harsh operating conditions and environments such as high temperature, strong electromagnetic interference, and strong vibration of rail transit trains.

Description

A train vehicle level Ethernet switching device

technical field

The invention relates to an Ethernet switching device, in particular to a train vehicle level Ethernet switching device.

Background technique

The normal operation of various rail transit train on-board equipment is directly related to the safety, stability, reliability, comfort and train speed of railways and urban rail transit. The train communication network is the basis for the operation and maintenance of modern rail transit train equipment. A high-reliability, real-time, and large-capacity train communication network is of great significance for improving the operational efficiency of rail transit trains, improving train reliability, ensuring driving safety, and reducing maintenance costs.

Existing rail transit trains have many on-board machinery, electrical and auxiliary equipment, and there are a large number of distributed sensors and complex coupling intelligent nodes installed in the train. With the improvement of performance requirements, there is an urgent need for the train communication network to have higher real-time performance and reliability, better maintainability and scalability, high bandwidth and good interoperability, etc., and can perform distributed task processing and data processing. However, due to the low transmission rate of the train communication network used on the existing locomotives, high-speed EMUs and urban rail trains, many associated status information and hidden troubles of train traction, braking, auxiliary equipment, etc. The possible failure of the whole train cannot be found in time, which makes it difficult to trace the source of a large number of accidents. Ethernet is based on the IEEE802.3 standard. As a field bus with large-capacity data transmission capabilities, it has been widely used in industrial sites, such as Ethernet/IP, PROFINET, Ethernet PowerLink, EtherCAT, MODBUS-IDA and EPA Real-time Ethernet. However, the on-board environment of trains is harsh, and decompilation and reconnection between vehicles are often required. The commonly used 100Mbps and 1000Mbps civil and industrial Ethernets do not meet the needs of train communication networks in terms of reliability, real-time performance and stability. Needs to be improved.

Contents of the invention

The purpose of the present invention is to address the shortage of bandwidth of existing rail transit train communication network devices, and provide a train vehicle-level Ethernet switching device specially designed for severe train operating conditions and environments, which integrates train communication network data exchange, broadcast storm protection, automatic Address learning, high-speed non-blocking switching, network expansion and other multi-functional devices can be used alone or inserted into the chassis in the form of modules.

The technical scheme that the present invention solves the problems of the technologies described above is as follows:

A train vehicle level Ethernet switch device. The device consists of switching module, EEPROM module, SPI module, PLL clock module, crystal oscillator module, MDI/MDI-X automatic conversion module, power saving mode module, network transformer module, and five 10/100MBASE-TX adaptive M12 network interface modules , Ethernet interface protection module, LED indicator module, reset module and working power supply module.

The device is provided with an exchange module, which includes an exchange chip and a PLL clock module connected to the exchange chip, a crystal oscillator module, and a reset module, and an MDI/MDI-X automatic conversion module and a power-saving mode module are embedded on the exchange module; the device The network interface for external communication consists of a network transformer module, an Ethernet interface protection module, an M12 network interface module based on the IEC 61076-2-101 standard, and an LED indicator module; the device also includes a working power supply module, an EEPROM module, and an SPI module.

The connection relationship of each module: the switch module is equipped with a PLL clock module, a crystal oscillator module, a reset module, an MDI/MDI-X automatic conversion module and a power saving mode module; The working power supply module is connected; the SPI module is connected with the three-state gate module; the network transformer module is connected with the M12 network interface module; the Ethernet interface protection module is connected with the M12 network interface module.

The functions of the above modules are as follows:

The switch module is used as the core module for data exchange; the EEPROM module is used to configure the register settings in the switch chip; the SPI module is used for external devices to configure the registers in the switch chip through serial mode; the PLL clock module and crystal oscillator module provide basic clock signals to the switch module ; MDI/MDI-X automatic conversion module is used to provide automatic conversion function of network cable port; power saving mode module is used to make the whole device enter low power consumption and power saving mode; network transformer module is used for signal level coupling and electrical isolation function; M12 The network interface module is used for data transmission on the train; the Ethernet interface protection module is used to protect the voltage impact caused by the outside world; the LED light indicator module is used to indicate the link connection status, full-duplex status, and transmission rate of the switching device Status; the reset module is used to reset and start the whole device; the working power module mainly realizes the conversion of 110V DC power into the power required by each module of the whole device.

Advantages of the present invention:

The device of the present invention is mainly used in data transmission and data exchange of train networks such as rail transit train communication control systems, train fault diagnosis systems, and train passenger information systems. A vehicle-level Ethernet switching device specially designed for harsh operating conditions and environments such as high temperature, strong electromagnetic interference, and strong vibration of rail transit trains. At the same time, it has high communication rate, low delay, full-duplex communication, supports QoS and VPN, and has high security and reliability. The operating temperature is -40°C to +85°C. It can be used alone, or it can be inserted into the chassis in the form of modules. And it is in line with the development needs of rail transit on-board train communication network and information technology.

Description of drawings

Fig. 1 is a schematic diagram of a single application of the present invention.

Fig. 2 is a schematic diagram of the application of the present invention as a module inserted into a chassis.

Fig. 3 is a module connection diagram of the present invention.

In the figure: switching module 1, LED indicator module 2, reset module 3, power saving mode module 4, MDI/MDI-X automatic conversion module 5, working power module 6, SPI module 7, EEPROM module 8, crystal oscillator module 9, PLL clock module 10 , network transformer module 11 , Ethernet interface protection module 12 , M12 network interface module 13 .

Detailed ways

The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

The structure of the present invention is shown in Fig. 1 , Fig. 2 and Fig. 3 .

As shown in Figure 1, when the train vehicle-level Ethernet switching device is used as an independent switching device, the front panel is provided with a power supply LED indicator 1, a 2-pin independent power input interface 2, and 5 switching port LED indicators 3 and 5 D-coded 4-pin M12 network interface Port1 to Port5 correspond to 4 to 8 and reset button 9 respectively. There are four fastening bolt holes 10 and ground connections 11 around the device.

As shown in Figure 2, the train vehicle-level Ethernet switching device is inserted into the chassis as a switching device module In application, the front panel is equipped with power LED indicators 1, 5 switching port LED indicators corresponding to 2 to 6, and 5 D-coded 4-pin M12 network interfaces corresponding to 7 to 11, and there are 4 ports around the front panel. 12 fastening bolt holes.

As shown in Fig. 3, a kind of Ethernet switching device of train vehicle level is composed of switching module 1, LED light indicating module 2, reset module 3, power saving mode module 4, MDI/MDI-X automatic conversion module 5, working power supply module 6 , SPI module 7, EEPROM module 8, crystal oscillator module 9, PLL clock module 10, network transformer module 11, Ethernet interface protection module 12, M12 network interface module 13 constitutes.

The connection relationship of each module: the switch module 1 is provided with a PLL clock module 10, a crystal oscillator module 9, a reset module 3, an MDI/MDI-X automatic conversion module 5 and a power saving mode module 4; the switch module 1 is connected to the LED indicator module 2 respectively , the network transformer module 11, the EEPROM module 8 and the working power supply module 6 are connected; the network transformer module 11 is connected with the Ethernet interface protection module 12; the Ethernet interface protection module 12 is connected with the M12 network interface module 13.

The functions of each module are as follows:

The switch module 1 is used as the core module for data exchange; the EEPROM module 8 is used to configure the register settings in the switch chip; the SPI module 7 is used for external devices to configure the registers in the switch chip through serial mode; the PLL clock module 10 and the crystal oscillator module 9-way switch The module provides the basic clock signal; the MDI/MDI-X automatic conversion module 5 is used to provide the automatic conversion function of the network cable port; the power saving mode module 4 is used to make the whole device enter a low power consumption power saving mode; the network transformer module 11 is used for signal power Flat coupling and electrical isolation functions; M12 network interface module 13 is used for train on-board data transmission; Ethernet interface protection module 12 is used to protect the voltage impact caused by the outside; LED light indicator module 2 is used to indicate the chain of the switching device road connection status, full-duplex status, and transmission rate status; the reset module 3 is used to reset and start the whole device; the working power module 6 mainly realizes the conversion of 110V DC power into the power required by each module of the whole device.

Example 1

As shown in FIG. 3 , the switch chip of the switch module 1 adopts the KSZ8995MAI industrial-grade chip of MICREL Company, which is used as the core chip of the switch device, and coordinates and controls the work of each module connected to it. LED light indication module 2 contains 5 light-emitting LED lights, which are used to indicate the data transmission status of each port. The reset module 3 is composed of a high-speed switching diode 1N4148, a reset switch, and a known reset circuit, and is used for restarting the entire device. The power-saving mode module 4 is composed of peripheral circuits of the KSZ895MAI chip, and is used to allow the entire device to enter a low-power power-saving mode. The MDI/MDI-X automatic conversion module 5 is composed of the peripheral circuit of the KSZ895MAI chip, and is used to realize the function of automatic reversing of the network cable port. The working power supply module 6 is composed of XZR05/110S05 of Beijing Xingyuan Fengtai Company, MIC39100-3.3BS, MIC39150-1.8BT of MICREL Company, rectifier diode 1N4004 and known peripheral circuits, which provide 3.3V, 1.8V and 2.5V power supplies for the device respectively . SPI module 7 is made up of the 74F125 chip of FAIRCHILD company and known peripheral circuit, is used for the external equipment to configure and exchange the register in the chip in serial mode. EEPROM module 8 is made up of AT24C02 chip of ATMEL company and known peripheral circuit, is used for disposing the register setting in switching chip. The crystal oscillator module 9 and the PLL clock module 10 are composed of a 25MHZ crystal oscillator and known peripheral circuits for providing basic clock signals. The Ethernet interface protection module 12 is composed of 10 SR2.8 chips of SEMTECH Company, and is used to protect voltage impacts caused by human errors such as lightning and load switches. The M12 network interface module 13 is composed of 5 D-type coded 4-pin M12 interfaces of Phoenix Company, and is used for the 10/100MBASE-TX adaptive network data interface of the train communication system. The network transformer module 11 is composed of H1102 and H1164 chips of Pulse Company and known peripheral circuits. Among them, H1164 is connected with Prot1~Port4, and H1102 is connected with Port5, which is used for signal level coupling and electrical isolation.

Claims (2)

1. a rail vehicle level Ethernet exchanging device, hereinafter to be referred as device, it is characterized in that, device is by Switching Module, EEPROM module, SPI module, pll clock module, crystal oscillator module, MDI/MDI-X self-turnover module, battery saving mode module, network transformer module, 5 10/100MBASE-TX adaptive M 12 Network Interface Modules, Ethernet interface protection module, LED lamp indicating module, reseting module and working power module compositions based on IEC61076-2-101 standard;

In this device, be provided with Switching Module, Switching Module comprises exchange chip, is embedded with MDI/MDI-X self-turnover module and battery saving mode module on Switching Module; The network interface of this device correspondence with foreign country is made up of network transformer module, Ethernet interface protection module, 10/100MBASE-TX adaptive M 12 Network Interface Modules based on IEC61076-2-101 standard, LED lamp indicating module;

The annexation of each module: Switching Module is provided with pll clock module, crystal oscillator module, reseting module, MDI/MDI-X self-turnover module and battery saving mode module; Switching Module is connected with LED lamp indicating module, network transformer module, EEPROM module and working power module respectively; Network transformer module is connected with Ethernet interface protection module; Ethernet interface protection module is connected with 10/100MBASE-TX adaptive M 12 Network Interface Modules based on IEC61076-2-101 standard;

The function of above-mentioned each module is as follows: Switching Module is as the nucleus module of exchanges data; EEPROM module is used for configuring register setting in exchange chip; SPI module configures register in exchange chip for external equipment by serial mode; Pll clock module and crystal oscillator module provide basic clock signal to Switching Module; MDI/MDI-X self-turnover module is used for providing netting twine port auto-conversion function; Battery saving mode module is used for allowing whole device enter low-power consumption battery saving mode; Network transformer module is for signal level coupling and electrical isolation function; 10/100MBASE-TX adaptive M 12 Network Interface Modules based on IEC61076-2-101 standard are for train-installed transfer of data; Ethernet interface protection module is for shielding to the voltge surge causing from the external world; LED lamp indicating module is used to indicate link connection state, full duplex state, the transmission rate state of switch; Reseting module is used for allowing the startup that again resets of whole device; Working power module mainly realizes and converts 110V DC power supply to whole device modules needed power supply.

2. a kind of rail vehicle level Ethernet exchanging device according to claim 1, is characterized in that, this switch both can use separately ON TRAINS, and the exchange plug-in unit that can be used as again a certain system on train is placed in cabinet application.