KR101610223B1 - Network system for railway vehicles - Google Patents

Abstract

The present invention relates to a network system for a railway vehicle for data communication between multiple vehicles. The vehicles are formed into multiple groups, and the network topology of the vehicles and the groups is formed with at least one among ring topology, star topology, and daisy chain topology. The present invention is capable of reducing a data transmission process and the number of necessary cables for the formation of a network, and minimizing an interference effect and a delay time during a data communication procedure.

Description

[0001] NETWORK SYSTEM FOR RAILWAY VEHICLES [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a network system for a railway vehicle, and more particularly, to a network system for a railway vehicle between various controllers and devices provided in each vehicle.

Railway vehicles are equipped with various networks for communication between various controllers and devices.

The network topology includes a daisy chain topology in which the devices can communicate information in sequence so that the fewest number of cables can be used, and a daisy chain that connects start and end, A ring topology that uses a common connection, a bus topology with a small number of cables but a high probability of interference during transmission, and a star topology that minimizes the path by placing a switching hub in the center have.

The overall network can be divided into an in-vehicle topology and a vehicle-to-vehicle topology, and both the intra-vehicle topology and the inter-vehicle topology can be implemented based on one of the above-described topologies.

However, in the conventional network topology, the star topology has a large number of cables, and in particular, the number of cables connected to the vehicle having the entire hub is greatly increased, which not only burdens the connector design but also causes the cable to be disconnected, The entire network can not be operated.

The daisy chain topology also has the advantage of simple cable connection and easy connection even when train or train is operated. However, there is a problem that communication between distant vehicles increases delay time and increases possibility of interference.

Moreover, although the bus topology provides the simplest structure, there is a very high possibility of high interference with no connection at all when the cable is disconnected.

The background art of the present invention is disclosed in 'Network topology configuration method and node' of Korean Patent Laid-Open Publication No. 10-2005-0073427 (July 13, 2005).

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to reduce the number of cables and data transmission steps required for network configuration by combining a star topology and a daisy chain topology, The present invention provides a network system for a railway car that minimizes delay time and interference effects in the process.

A network system for a railway car according to an aspect of the present invention is a network system for a railway vehicle for data communication between a plurality of vehicles, the vehicles being formed into a plurality of groups, and the network topology of the vehicle and the group includes ring topology, And a daisy chain topology.

The inter-group network topology of the present invention is characterized by being implemented in the daisy chain topology.

The inter-group network topology of the present invention is characterized by being implemented in the ring topology.

The network topology of the group of the present invention is characterized by being implemented with the star topology.

The vehicle internal network topology of the present invention is characterized by being implemented with the ring topology.

The vehicle internal network topology of the present invention is characterized by being embodied in the daisy chain topology.

The vehicle internal network topology of the present invention is characterized by being implemented in the star topology.

The number of vehicles in the group according to the present invention is calculated by reflecting the number of vehicles in the group and the average value of the route nodes in each of the weights for the number of nodes and the weight for the cable savings in the communication.

The number of vehicles in the group of the present invention is calculated by substituting the total number of vehicles for the weight for the number of nodes and the weight for the cable savings in the communication.

The weights for the number of nodes and the weight for the cable savings are determined according to at least one of the maximum number of cables and the target transmission rate in the train knitting configuration.

The network system for a railway car according to one aspect of the present invention combines a star topology and a daisy chain topology to reduce the number of cables and data transmission steps required for a network configuration and minimizes the influence of delay time and interference in a data communication process.

1 and 2 are views showing an embodiment of a network topology of a network system for a railway car according to an embodiment of the present invention.
3 is a diagram illustrating a network topology connection for a railway vehicle according to an embodiment of the present invention.
4 is a view illustrating an embodiment of a network topology for a railway vehicle according to an embodiment of the present invention.
FIG. 5 is a diagram showing an example of star connection between devices in a vehicle according to an embodiment of the present invention. FIG.
6 is an illustration showing an example of ring-connected devices in a vehicle according to an embodiment of the present invention.
7 is a diagram illustrating a network topology for a railway vehicle connected to a switching hub through a terminal box according to an embodiment of the present invention.
FIG. 8 is a diagram illustrating a network topology for a railway vehicle in the event of a vehicle failure, not a group leader according to an embodiment of the present invention.
FIG. 9 is a diagram illustrating a network topology for a railway vehicle in the event of a vehicle failure, which is a group leader according to an embodiment of the present invention.
10 is a view illustrating an embodiment of a network topology for a railway vehicle according to an embodiment of the present invention.
11 is a diagram illustrating a network topology for a railway vehicle according to an embodiment of the present invention.

Hereinafter, a network system for a railway car according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. Further, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the user, the intention or custom of the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

FIG. 1 and FIG. 2 are views showing an embodiment of a network topology of a network system for a railway car according to an embodiment of the present invention, FIG. 3 is a diagram illustrating a network topology connection for a railway vehicle according to an embodiment of the present invention, 4 is a view showing an embodiment of a network topology for a railway vehicle according to an embodiment of the present invention, FIG. 5 is an illustration showing an example of star connection between devices in a vehicle according to an embodiment of the present invention, FIG. 6 7 is a diagram illustrating a network topology for a railway car connected through a terminal box and a router according to an embodiment of the present invention. 8 is a diagram illustrating a network topology for a railway vehicle in the event of a vehicle failure, not a group leader according to an embodiment of the present invention; FIG. 9 is a diagram illustrating a network topology for a railway vehicle in the event of a vehicle failure, which is a group leader according to an embodiment of the present invention. FIG. 10 is a diagram illustrating an embodiment of a network topology for a railway vehicle according to an embodiment of the present invention 11 is a diagram illustrating a network topology for a railway vehicle according to an embodiment of the present invention.

Referring to FIGS. 1 and 2, a railway network system according to an exemplary embodiment of the present invention includes a ring topology, a star topology, and a daisy chain topology.

In the railway vehicle network system shown in FIG. 1, the network topology is implemented in a ring topology in a vehicle, the star topology is implemented in a group, and a daisy chain topology is implemented between groups. For reference, in the inter-vehicle network topology in this embodiment, a topology in which different topologies are combined, such as a star topology and a daisy chain topology, will be referred to as a hybrid topology hereinafter for convenience of explanation.

In the network topology of the railway vehicle network system shown in FIG. 2, the inside of the vehicle is implemented as a star topology, a ring topology or a daisy chain topology, a group inside is implemented as a star topology, and a group is implemented as a daisy chain topology.

In such a railway vehicle network topology, a plurality of (M) vehicles can be formed into one group, which is implemented as a star topology in each group and a daisy chain topology among the groups.

Thus, the network topology for rail vehicles can reduce the number of cables 60 and reduce the delay time and interference effects in data communication by reducing the daisy chain steps.

The number of vehicles in the group 10 can be calculated as follows, since the topology implemented in the vehicle and the topology implemented between the vehicles are implemented differently as implemented in a plurality of groups as described above.

Hereinafter, the total number of vehicles is N, and the number of vehicles 10 in each group is M.

개의 그룹이 형성된다. 이 때

는 ceiling을 나타내는 것으로써 x 보다 작지 않은 정수 중 최소값을 의미한다.If a group is composed of M cars for the total number of vehicles N and implemented as a star topology,

Groups are formed. At this time

Represents ceiling, which means the smallest integer less than x.

 In this case, the maximum number of cables when connecting the vehicles 10 is equal to M. This is because the intra-group connection is assumed to be a star topology, and each of the M vehicles is connected by a cable. The number of relay nodes 30 that are communicated between each node 20 in the combination of a star topology and a daisy chain topology can be obtained as follows.

First, as shown in FIG. 2, in a hybrid topology in which each node 20 is implemented as a star topology and a vehicle topology is a combination of a star topology and a data chain topology among the vehicles 10, The number of nodes 30 can be determined as follows.

As shown in FIG. 1, a hybrid topology in which each node 20 is connected in a ring topology and the vehicle 10 is a combination of a star topology and a data chain topology includes a hybrid topology (Hybrid topology in which the nodes 20 are connected in a star topology and the vehicles 10 are in a star topology and a data chain topology), the number of node steps added according to the inner ring topology Is added to the average value.

A topology in which each node 20 shown in FIG. 2 is connected in a star topology and a vehicle topology in which a star topology and a data chain topology are combined between the vehicles 10 can be represented as shown in FIG.

Referring to FIG. 3, the number of the pass-through nodes 30 when the device of the vehicle 10 in the first group attempts to communicate with another device is one in the case of the same group and increases by one in the other group. In the case of each node 20 of the second group, there is one in the case of communicating with the same group of nodes 20, and the number of the relay nodes 30 is 2 in the first group and in the third group of nodes 20 And from the fourth group it has a value that increases by one. The table below summarizes the following.

Number of pass-through nodes according to the group in communication between nodes in the vehicle Group 1 Group 2 Group 3 ... Group G Group 1 One 2* 3 * ... * G * Group 2 2 One 2* ... * G-1 * Group 3 3 2 One ... G-2 * ... ... ... ... ... ... Group G G G-1 G-2 ... One

)은 아래의 수학식1을 통해 구할 수 있다.The average value of the passing node 30 (for example,

) Can be obtained by the following equation (1).

The above Equation 1 can be obtained by subtracting 1 from Table 1 and then applying a water supply formula to one portion of the diagonal string (*). That is, the following table is obtained by subtracting 1 from Table 1.

The number of the passing nodes 30 according to the group in communication between the in-vehicle devices Group 1 Group 2 Group 3 ... Group G Group 1 0 One* 2* ... * G-1 * Group 2 One 0 One* ... * G-2 * Group 3 2 One 0 ... G-3 * ... ... ... ... ... ... Group G G-1 G-2 G-3 ... 0

In Table 2, the sum of the strings is summed up as shown in Equation 2 below.

In Equation (2), Equation (1) can be obtained by multiplying by ² , dividing by G ² to obtain an average, and then adding 1.

The procedure for obtaining the number of appropriate vehicles 10 in the group is as follows. The weights for the number of nodes 20 and the cable savings during communication vary according to railway system specifications during the design of the entire train. For example, the weight for the number of nodes and the weight for the cable savings may be determined as determined by at least one of the maximum number of cables and the target transmission rate in the train knitting configuration. Here, when the weight for the number of nodes 20 and the weight for the cable reduction amount are W _P and W _C , the number G of groups for the number N of the vehicles 10 is obtained.

In this case, the integrated weight value (W _T ) is summarized as shown in Equation (3) below.

이므로 상기한 수학식 3은 아래의 수학식 4와 같이 정리될 수 있다. Here, M is

The equation (3) can be summarized as the following equation (4).

Where r is an integer such that N + r is a multiple of G and has a range from 0 to N-1. The overall weight (W _T ) is convex form with respect to G, and if derivative is taken with respect to G to obtain the extremum, it is summarized as Equation (5) below.

Since the denominator G ² can not be zero in Equation (3), the equation (5) is rearranged so that the numerator becomes zero, and then the equation is summarized as Equation (6) below.

Here, since G and r are integers, G and r can be obtained by repeatedly calculating r = 0. As an example of this case, the case where the weight W _P for the number of nodes 20 and the weight W _C for the cable saving amount have the same value and N = 18 will be described.

는

이므로 약 7.28 이다. 이 때, N=18인 경우 가능한 G=1, 2, 3, 6, 9, 18 이므로,

는 6 또는 9가 될 수 있다. First, when r = 0

The

It is about 7.28. In this case, since G = 1, 2, 3, 6, 9, and 18 are possible when N = 18,

Can be 6 or 9.

=6이면 r=0(N+r=18은 6의 배수)이다.

= 6, r = 0 (N + r = 18 is a multiple of 6).

=9이면 r=0(N+r=18은 9의 배수)이다.

=6인 경우와

=9인 경우 각각에 대하여 수학식 4에 대입하여 그 값을 구하면 (여기서 W_c와 W_p는 동일한 값이므로 1로 가정한다)

=6일 때 W_T=5.94,

=9일 때, W_T=5.96이 나오므로

=6인 경우 더 작은 값이 나와서 적합하다.

= 9, r = 0 (N + r = 18 is a multiple of 9).

= 6 and

= 9, the value is substituted into Equation 4 (where W_c and W_p are equal to each other and assumed to be 1)

= 6, W_T = 5.94,

= 9, W_T = 5.96 is displayed

= 6, a smaller value is appropriate.

이 된다.In the above example, G = 6,

.

의 값에 대한 r의 값이 0이 아닌 경우 이에 대하여 수학식 6을 적용하여 구한

의 값이 유효한 지 검증하여야 한다.Unlike the above example,

If the value of r is not 0, the equation

Should be validated.

Therefore, if the network has a hybrid topology with G _max = 6 and M = 3 when the 18-car train has two weights, both the number of cables and the route shortening can be satisfied. An example of realizing the connection between the vehicles 10 in the hybrid topology when M = 3 is shown in FIG. Here, the connection in the vehicle 10 is implemented in a star topology.

Referring to FIG. 4, the groups are connected by a daisy chain topology, within a group by a star topology, and between vehicles by a star topology.

Meanwhile, when the hybrid topology is implemented as described above, the terminal box 40 and the switching hub 50 may be implemented as shown in FIGS. 5 and 6. FIG.

When the size M of the group is determined through the above process, the vehicle 10 is connected to the rear end of the vehicle 10 with M cables 60 as shown in Figs. 5 and 6, and these cables 60 A terminal box 40 is provided. In this case, the network inside the vehicle 10 may be implemented as a star topology or a ring topology depending on the purpose.

FIG. 5 shows that the hybrid topology is implemented as a star topology in the vehicle 10, and FIG. 6 illustrates a hybrid topology in which M = 3, in which a ring topology is implemented in the vehicle 10 .

In this case, the length N of the entire vehicle 10 may vary depending on the route. Accordingly, the size M of the group may be changed as W _C and W _P are changed. Therefore, it is also useful to connect the cable 10 with a cable 60 having a larger number than M, with a margin in implementing the network.

In the structure of the vehicle 10 as described above, depending on the role of the vehicle 10 in the group on the network as shown in Fig. 7, the number of the terminal box 40 and the number of the switching hubs 50, It can be easily adapted to its role through programming.

In a vehicle structure according to such a network topology, when any one of the switching hubs 50 of the vehicle 10 operates abnormally, the terminal box 40 is adjusted so that the other vehicle 10 or other groups A network can be implemented.

That is, FIG. 8 shows a state in which communication is impossible only for the vehicle 10 when the vehicle 10 other than the group leader is in a state in which communication is impossible, and FIG. 9 shows a state in which the vehicle 10, , It is shown that the group is in a state in which communication is impossible.

In the above-described embodiment, the number of cable was positive up to the cable if the number in the conditions, it is possible to specify the condition average cable channel is connected between each of the vehicle 10, and in this case synthesis weights (W _T) is the following equation (7) Respectively.

이 되며, 이를 푸는 과정은 앞에서 설명한 과정과 동일하다.When this equation (7) is differentiated and solved for G

And the process of solving this is the same as the process described above.

In a hybrid topology, a network connection can employ a daisy chain topology, but the first and last groups can be connected in a ring topology.

The hybrid topology using the ring topology can perform other path communication even if a disconnection occurs in another intermediate group or node 20 or the like. In the case of a hybrid topology using ring topology, the value of the synthetic weight W _T increases only by the constant W _C in the equation for obtaining the optimum group size G.

및 평균 케이블 수에 대하여 구한 G, 즉

는 데이지 체인 토폴로지를 사용할 때와 동일하다. Therefore, G, that is,

And the average number of cables G

Is the same as when using a daisy chain topology.

FIG. 10 shows a case in which the inter-group connection is implemented using a ring topology when M = 3. Here, the connection in the vehicle 10 is implemented as a star topology.

When the ring topology is used, the number of cables to be embedded in the vehicle 10 becomes M + 1, which is one greater than the group size M.

FIG. 11 shows a hybrid topology implemented in a star topology inside the vehicle 10 and connected in a ring structure between the vehicles 10 when M = 3.

As described above, the network topology for a railway vehicle according to an embodiment of the present invention combines a star topology and a daisy chain topology to reduce the number of cables and data transmission steps required for a network configuration, form a plurality of vehicles into one group, In a star topology and connecting each group to a data chain topology to minimize the effects of latency and interference in the data communication process.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, I will understand. Accordingly, the true scope of the present invention should be determined by the following claims.

10: Vehicle
20: node
30: Route node
40: Terminal box
50: Switching hub
60: Cable

Claims (10)

A network system for a railway vehicle for data communication between a plurality of vehicles,
Wherein the vehicles are formed into a plurality of groups and the network topology of the vehicle and the group is implemented in at least one of a ring topology, a star topology, and a daisy chain topology,
Wherein the number of vehicles in the group is calculated by reflecting the number of vehicles in the group and the average value of the route nodes in each of the weights of the number of nodes and the weight of the cable savings in the communication.
The network system for a railway car according to claim 1, wherein the inter-group network topology is implemented in the daisy chain topology.
The network system for a railway car according to claim 1, wherein the inter-group network topology is implemented in the ring topology.
The network system for a railway car according to claim 1, wherein the network topology in the group is implemented in the star topology.
The network system for a railway car according to any one of claims 1 to 4, wherein the network topology inside the vehicle is implemented in the ring topology.
The network system for a railway car according to any one of claims 1 to 4, wherein the network topology inside the vehicle is implemented in the daisy chain topology.
The network system for a railway car according to any one of claims 1 to 4, wherein the network topology inside the vehicle is implemented in the star topology.
delete The network system for a railway car according to claim 1, wherein the number of vehicles in the group is calculated by substituting the total number of vehicles for the weight for the number of nodes and the weight for the cable savings in the communication.
The network system for a railway car according to claim 1, wherein the weight for the number of nodes and the weight for the cable saving amount are determined according to at least one of a maximum number of cables and a target transmission speed at the time of train configuration.

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