KR20070067565A - Fault tolerant full-duplex distribution control system - Google Patents

Abstract

A fault-tolerant full-duplex distribution control system is provided to prevent the diffusion of errors by detecting a fault in a network adaptor in real-time and removing a defective node from a network. A full-duplex distribution control system communicates data among plural nodes through a full-duplex network. Each of the nodes includes a controller(102), first and second network adaptors(126,132), and a fault detector. The controller controls communication of data between two nodes. The first network adaptor transmits the data from the controller to the network, and outputs the data from the network to the controller. The second network adaptor receives the data, which is fed back from the first network adaptor to the network. The fault detector determines whether the first network adaptor is defective based on the data outputted from the controller and the second network adaptor.

Description

Fault tolerant full-duplex distribution control system

1 is a schematic configuration diagram of a general full-duplex distributed control system.

2 is a data flow diagram of each node when any network adapter fails in the conventional full-duplex distributed control system.

3 is a block diagram of a full-duplex distributed control system having a conventional network adapter.

4 is a block diagram of a fault-tolerant full-duplex distributed control system according to the present invention.

5 is a data flow diagram of each node when any network adapter fails in a fault-tolerant full-duplex distributed control system according to the present invention.

* Brief description of the main parts of the drawing

Server: 10

Nodes: 20, 30, 40, 100, 120, 140

Controller: 12, 22, 32, 42, 102, 122, 142

Network adapters: 14, 24, 34, 44, 106, 112, 126, 132, 146, 152

Coupling Detector: 104, 124, 144

Input buffer: 108, 114

Output buffer: 110

The present invention relates to a fault-tolerant full-duplex distributed control system, and more particularly, to a failure of a network adapter of a train control system network using a full-duplex method for communication in a distributed control period in a distributed control structure train control system composed of embedded controllers. The present invention relates to a fault-tolerant full-duplex distributed control system that prevents communication disconnection of distributed controllers.

The control device of a railway vehicle has a slight difference depending on the configuration of the device, but it is composed of a distributed controller such as a vehicle core controller, a speed detector, a driver display controller, a recorder, a brake controller, and the data transmission and reception of each distributed controller and the core controller. Various buses are used for this purpose, and the data transmission / reception bus of such a distributed controller is called a train control network.

There are many ways to design the train control system network, but the design of the full-duplex method is 1: n to connect the server and the node to secure the network structure and the core controller that becomes the server The typical design is to design the distributed controller to control the Polled-Response.

On the other hand, Figure 1 is a block diagram of a general full-duplex distributed control system, Figure 2 is a data flow diagram of each node when any network adapter failure in the conventional full-duplex distributed control system, Figure 3 is a conventional network It is a block diagram of a full-duplex distributed control system equipped with an adapter.

In the conventional full-duplex distributed control system, each node is connected as shown in FIG. 1, so that data transmitted from the server 10 is simultaneously transmitted to all access nodes, and response signals of each node 20, 30, and 40 are transmitted. It will be delivered to the server one at a time.

In the conventional full-duplex distributed control system, the server 10 simultaneously transmits data to the node 1 (20), the node 2 (30) and the node 3 (40) via a data communication line. Data transmission converts the digital signal generated by the controller 12 inside the server into a potential difference between pins 5 and 6 of the network adapter 14, thereby converting the network adapter 24 of the node 1 20, node 2 ( The network adapter 34 of the node 30 and the pins 7 and 8 of the network adapter 44 of the node 3 40 are simultaneously input to the controller 22 of the node 1 20 and the controller of the node 2 30 ( 32), it is input as a digital signal to the controller 42 of the node 3 (40).

On the contrary, the data of the controllers 22, 32, and 42 provided in each node 20, 30, and 40 is transmitted to pins 7 and 8 of the network adapter 14 of the server 10. In this case, since the transmission data of the nodes is connected to the transmitting end of each node, unlike the data transmitted from the server 10 to each node, other nodes cannot be received.

However, as described above, in a full duplex network composed of a single server and a plurality of nodes, if a network adapter provided in any one node fails, all nodes configured in the network cannot transmit data to the server. Even if a single fault occurs in a node that receives data from the server, all nodes cannot receive data from the server.

In the former case, for example, when pin 3 of the network adapter 24 of the node 1 20 is fixed to a logic “0” or a logic “1”, it is connected to the network adapter 24 of the node 1 20. Since the buses that transmit data from each node 30, 40 to the server 10 are all fixed to a logic “0” or a logic “1”, the server 10 from the other node 2 or node 3 40 may be fixed. The data to be sent is no longer available.

In the latter case, for example, the node 1 (20), the node 2 (30) and the node connected to the bus transmitting data from the server 10 to the node 1 (20), the node 2 (30) and the node 3 (40). If a fault occurs at pins 7 and 8 of any one of the 3 (40) network adapters, as shown in FIG. 2, the data of the server 10 may not be transmitted to each node 20, 30, 40, or It is sending wrong data.

The present invention has been made to solve the above-described problem, when a fault occurs in the network adapter embedded in the server or node in a train control network configured in a full-duplex method, it is possible to detect in real time as well as the defect is generated The purpose of the present invention is to provide a fault-tolerant full-duplex distributed control system that can prevent the spread of defects in a train control network due to a single fault by excluding nodes from the network.

In the fault-tolerant full-duplex distributed control system according to the present invention for achieving the above object, in a full-duplex distributed control system in which a plurality of nodes communicate with each other through a full-duplex network, each node is a different node. A controller for controlling data communication with the controller; A first network adapter for transmitting data output from the controller to a network and outputting data transmitted from the network to the controller; A second network adapter for receiving input data output from the first network adapter to a network; And a defect detector for determining whether the first network adapter is defective based on the data output from the controller and the data output from the second network adapter.

And a switching unit for intermitting input power of the first network adapter and the second network adapter.

The defect detector may control the switching unit to cut off the input power when the defect of the first network adapter is confirmed.

The controller may perform a controller such as an on-vehicle core controller, a speed detector, a driver display controller, a recorder, a brake controller, and the like for a remote vehicle at a remote location.

The defect detector may be operated only when an enable signal is input from the controller.

Hereinafter, a fault-tolerant full-duplex distributed control system according to the present invention will be described in detail with reference to the accompanying drawings.

4 is a block diagram of a fault-tolerant full-duplex distributed control system according to the present invention, and FIG. 5 is a data flow diagram of each node when any network adapter fails in the fault-tolerant full-duplex distributed control system according to the present invention. .

The fault-tolerant full-duplex distributed control system according to the present invention, as shown in FIG. 4, can be applied to a distributed control system capable of transmitting and receiving data in a full-duplex manner to each node 100, 120, and 140 via a data communication line. Can be.

Each node refers to a distributed controller that performs a unique processing function and performs data communication with another node. Each node 100, 120, and 140 performs another processing function in addition to performing a unique processing function. In order to perform data communication with 100, 120, and 140, the same components are provided.

That is, node # 1 100 comprises a controller 102, two network adapters 106 and 112, and a fault detector 104, and node # 2 120 comprises a controller 122 and two network adapters ( 126, 132 and a fault detector 124, node # 3 (140) comprises a controller 142, two network adapters (146, 152) and a fault detector (144). Accordingly, since the components of each node 100, 120, 140 perform the same function, each component will be described below with reference to one node # 1 (100).

As described above, the node # 1 100 includes a controller 102, two network adapters 126 and 132, and a defect detector 124.

The controller 102 represents a controller that performs a unique control function in a distributed controller such as a vehicle core controller, a speed detector, a driver display controller, a recorder, a brake controller, and the like that perform various functions on a railway vehicle at a remote location. will be.

The controller 102 of the node # 1 100 performs control processing such as generating data to be transmitted to the other nodes 120 and 140 or converting to a transmission format when performing data communication with the other nodes 120 and 140. To output to the output buffer 110 side of the first network adapter 106 through the transmission port (Serial Out), the first network adapter 106 from another node # 2 (120) or node # 3 (140) Receive the data transmitted to the input port (Serial In) through.

Among the two network adapters 106 and 112, the first network adapter 106 receives data required to be transmitted from the controller 102 to the output buffer 110 and transmits the data to the full-duplex network through the data communication line. The data transmitted from the nodes 120 and 140 through the data communication line is input to the input buffer 108 and transferred to the controller 102.

Of the two network adapters 106 and 112, the second network adapter 112 is requested to be transmitted by the controller 102 and outputs data output to the full-duplex network through the first network adapter 106. The feedback input through the 110 is output to the input terminal (Com2) of the defect detector (104).

The defect detector 104 is output through the output port (Serial Out) from the controller 102 is input to one input terminal (Com1) and the other from the second network adapter 112 is output Based on the data input to the input terminal (Com2) of the first network adapter 106 to determine whether or not the defect.

That is, the defect detector 104 compares the data output from the controller 102 and the data output from the second network adapter 112 to determine whether the two data are the same. If it is determined that the first network adapter 106 is normal, and if it is determined that the data are not the same data, the first network adapter 106 determines that a defect has occurred.

On the other hand, each node # 1 (100), node # 2 (120) and node # 3 (140) has a first switching unit 116, a second switching unit 136 and a third switching unit 156, respectively. Done.

When the defect detector 104 determines that a defect occurs in the first network adapter 106, the power of the first network adapter 106 and the second network adapter 112 connected to the full duplex network is cut off. The switching unit 116 is controlled. Accordingly, the node # 1 100 is physically disconnected from the full-duplex network, and as shown in FIG. 5, the node # 1 100 is in a high impedance state and thus does not affect data communication between the other nodes 120 and 140. 120 and 140 enable mutual data communication.

As described above, the fault-tolerant operation performed at the node # 1 100 may be performed in the same manner in the other nodes 120 and 140.

As described above, the fault-tolerant full-duplex distributed control system according to the present invention can prevent the spread of defects in which communication of all the controllers connected to the network is interrupted due to the occurrence of a single fault of the network adapter that performs the interface between the controller and the network. do.

The above embodiment relates to the most preferred embodiment of the present invention, the present invention is not limited to the above embodiment, various modifications are possible within the scope without departing from the spirit.

The fault-tolerant full-duplex distributed control system according to the present invention has an effect of detecting in real time when a defect of a network adapter embedded in a server or a node occurs in a train control network configured in a full-duplex method.

In addition, the present invention has the effect of preventing the defect spread of the train control network due to a single defect by excluding the node in which the fault occurs.

In addition, the present invention has the effect of increasing the availability of the distributed train control system by minimizing the failure of using the data communication line due to a single fault in the train control network configured in a full-duplex method.

Claims (5)

In a full-duplex distributed control system in which a plurality of nodes perform data communication with each other through a full-duplex network, Each node comprises a controller for controlling data communication with another node; A first network adapter for transmitting data output from the controller to a network and outputting data transmitted from the network to the controller; A second network adapter for receiving input data output from the first network adapter to a network; And And a defect detector to determine whether the first network adapter is defective based on the data output from the controller and the data output from the second network adapter. The method of claim 1, And a switching unit for intermitting the input power of the first network adapter and the second network adapter. The method of claim 2, And the defect detector controls the switching unit to cut off input power when a defect of the first network adapter is confirmed. The method of claim 1, The controller is a fault-tolerant full-duplex distributed control system for performing a controller such as a vehicle core controller, a speed detection unit, a driver display control unit, a recording unit, a braking control unit for a railway vehicle at a remote location. The method of claim 1, The defect detector, And operating only when an enable signal is input from the controller.

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