JPH10324246A - Parent-child transmission method - Google Patents

Abstract

(57) [Summary] [PROBLEMS] By using only a communication line connecting a primary station and a secondary station, a secondary station performs real-time timeout detection according to a polling cycle and a secondary system comprising a dual system. An object of the present invention is to enable quick system switching of a station. SOLUTION: In a parent-child transmission system in which a secondary secondary station (ATO ground apparatus) 202 is connected to a primary station (station control apparatus) 201 via a transmission line 205, and a polling cycle of a plurality of modes is transmitted. When the primary station changes the polling cycle to the fast mode, the secondary station changes the setting to the timeout detection time in accordance with the fast mode, and when the primary station changes the polling cycle to the slow mode, In the next station, the setting is changed to the timeout detection time according to this slow mode, and in any case, when the secondary station detects a timeout consecutively an arbitrary number of times, it is determined that a communication error has occurred and the system is switched. And

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a parent-child transmission system in which a primary station is connected to a secondary secondary station, and more particularly to a parent-child transmission system for detecting a communication abnormality between the primary station and the secondary station. .

[0002]

2. Description of the Related Art Generally, in a train operation management system, a station control device constituting a system increases a load of processing related to train control while a train is in a control range of the station. On the other hand, even when there is no train on the train, it is necessary to perform unsteady processing such as timetable transfer, so that the capacity of the CPU of the station control device cannot be assigned only to steady processing related to train control. For this reason, the station control device, except when the track circuit of the home truck falls and is detecting the train,
It is necessary to empty the CPU for unsteady processing,
Thereby, the performance can be improved. Therefore, when a device as a secondary station is connected to such a station control device and parent-child communication is performed with the station control device as a primary station, communication processing with the secondary station is also prepared for unsteady processing. It is necessary to increase the communication interval (increase the polling cycle). In addition, in such parent-child communication, when a communication abnormality is detected, it is necessary for the device of the secondary station to separately acquire contact information for outputting a failure from the station control device as the primary station. Traditional parent-child communication is
In the communication system in which the primary station and the secondary station have a one-to-one relationship, and the primary station changes the polling cycle, the secondary station detects the failure of the line by the longest polling of the primary station. There is a method of counting time-outs based on a cycle. That is, in this method, if the polling cycle is not received from the primary station even if the time of the longest polling cycle is exceeded, the secondary station times out (failure detection). In this method, the secondary station cannot detect a line failure in a time shorter than the longest polling cycle. Further, since the primary station can transmit data at an arbitrary timing, a failure of the line can be detected earlier than the secondary station. Therefore, apart from the communication line, the primary station
There is a method in which a contact circuit for informing the next station of a line failure is provided, and the secondary station detects a failure of the communication line in a time shorter than the longest polling cycle. This method increases the cost because a contact circuit is provided separately from the communication line.
If the next station is far away, the cost will increase significantly.

[0003]

In the conventional parent-child communication, the primary station and the secondary station have a one-to-one relationship.
Even if the next station changes the polling cycle, the secondary station should detect the failure in accordance with the longest polling cycle. However, when a dual system is connected as a secondary station to the station control device and parent-child communication is performed with the station control device as the primary station, real-time system switching is performed in the failure detection by the longest polling cycle. There is a problem that can not be. In addition, a contact circuit is provided separately from a communication line connecting the primary station and the secondary station, and separately transmitting contact information for outputting a fault to the secondary station results in a problem of a large increase in cost. is there.

[0004] An object of the present invention is to use only a communication line connecting a primary station and a secondary station so that the secondary station performs real-time timeout detection in accordance with a polling cycle and a secondary system comprising a dual system. It is an object of the present invention to provide a parent-child transmission system that enables quick system switching between stations.

[0005]

In order to solve the above-mentioned problems, when the primary station changes the mode of the polling cycle,
The secondary station changes the setting to the timeout detection time in accordance with the polling cycle of the changed mode, and switches the system when the timeout is detected an arbitrary number of times in succession.
Further, when the primary station changes the mode of the polling cycle, the polling cycle of the changed mode is transmitted to the secondary station through the transmission line, while the secondary station is sent from means other than the primary station. Based on the information, the setting is changed to the timeout detection time corresponding to the polling cycle of the changed mode, and the system is switched when the timeout is detected continuously for an arbitrary number of times.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 illustrates a parent-child transmission scheme for making a polling cycle variable according to an embodiment of the present invention. This embodiment uses the transmission line from the primary station to the secondary station,
Signals a change in polling cycle. In FIG. 1, 201
Is the station control device of the primary station, 202 is the first system 203 and the second system 20
Station ATO ground equipment of the secondary station consisting of a dual system of 4, 205
Is a transmission line, 207 is a train position detecting device, 208 is a train,
209 represents a home track. Station control device 2 for primary station
01 is connected to the first station 203 and the second station 204 of the station ATO ground apparatus 202 of the secondary station by multi-drop connection via the transmission line 205. In addition, the train position detecting device 207
With the movement of the train, the train position is output to the station control device 201 for each track circuit.

FIG. 3 shows a bit arrangement of information transmitted from the primary station to the secondary station. In FIG. 3, reference numeral 301 denotes transmission information, 302 denotes 1-second cycle bits, and 303 denotes 60-second cycle bits. FIG. 4 shows a bit arrangement of information transmitted from the secondary station to the primary station. In FIG. 4, reference numeral 401 denotes transmission information; 402, an ACK bit having a one-second cycle;
Represents an ACK bit in a second cycle.

FIG. 2 shows a mode change of the polling cycle of the station control device 201 (primary station) and the station ATO ground device 202.
5 shows a flow representing a mode change of timeout detection of (secondary station). First, the station control device 201 sets the polling cycle to 60 seconds and performs polling at a cycle of 60 seconds (1).
01). From the train position detection device 207 to the home truck 2
When the line location information 09 is received (102), the polling cycle is changed from 60 seconds to 1 second, and the first and second systems 203 and 204 of the ATO ground equipment 202 are sequentially polled (10).
3). It is assumed that each system of the ATO ground apparatus 202 always collects data every second, regardless of the polling cycle. The station control apparatus 201 having changed the polling cycle to 1 second turns on the 1-second cycle bit 302 and turns off the 60-second cycle bit 303 of the transmission information 301, and sequentially outputs it to each system of the ATO ground apparatus 202 (105). ). ATO
Each system of the ground equipment 202 has transmission information 301 in which the 1-second cycle bit 302 is turned on and the 60-second cycle bit 303 is turned off.
Is received (112), the timeout detection time is changed to one second (113), the ACK bit 402 of the transmission information 401 in a one-second cycle is turned on, and output to the station control device 201 (1).
14). Thereafter, each system of the ATO ground device 202 performs timeout detection in one second. Here, the ATO ground device 20
When each of the systems 2 detects a timeout three consecutive times,
The transmission line is disconnected as a failure. Thereby, AT
Each system of the O ground apparatus 202 can detect a communication abnormality in 3 seconds. Therefore, if a failure occurs in the transmission line 205 while the train 208 stops at the station, the system can be switched by failure detection within three seconds.

When the train 208 leaves the station and the train 208 leaves the home track 209, the train position detecting device 2
07 is output to the station control device 201 (107), the station control device 201 turns off the one-second cycle bit 302 of the transmission information 301 and turns on the sixty-second cycle bit 303 while maintaining the polling of the one-second cycle, The data is sequentially output to each system of the ATO ground equipment (108). Each system of the ATO ground equipment 202
The one second cycle bit 302 is turned off, and the 60 second cycle bit 30 is turned off.
3 is turned on (115), the ACK bit 403 of the transmission information 401 with a period of 60 seconds is turned on, and output to the station controller 201 (116).
Returning to 11, the timeout detection time is set to 60 seconds (111). Hereinafter, each system of the ATO ground device 203
Timeout detection is performed in 60 seconds. Station control device 201
Receives the transmission information 401 with the ACK bit 403 of 60-second cycle turned on (109), returns to step 101, and changes the polling cycle to 60 seconds (101). As a result, the station control device 201 can lengthen the polling cycle and reduce the load of communication processing without each system of the ATO ground device 202 detecting a timeout.

FIG. 5 shows another embodiment of the present invention. This embodiment uses information from devices other than the primary station to
Inform the next station of the change in polling cycle. In FIG.
The first station 203 and the second system 204 of the dual station ATO ground apparatus 202 are connected to the station controller 201 of the primary station in a multi-drop manner via the transmission line 205. In addition, the train position detecting device 207 outputs the train position to the station control device 201 for each track circuit as the train 208 moves. In addition, the on-vehicle transmission ground transmission device 601 transmits information only to the on-ground transmission on-vehicle device 602 installed on the train 208 and the fixed point stop area of the station.

FIG. 6 is a flow chart showing the mode change of the polling cycle of the primary station and the mode change of the timeout detection of the secondary station. Here, information having a time difference in detection, such as a relationship between home track information and station fixed point stop information, is used as the polling cycle change timing. In other words, the primary station uses the home track information that has been detected longer by the secondary station, and the secondary station uses the station fixed point stop information that has been detected shorter by the primary station to change the timeout detection time. This is used as the timing. First, the station control device 2
01 sets the polling cycle to 60 seconds and performs polling at a cycle of 60 seconds (501). Train position detection device 20
7 receives the home track location information (50
2) Change the polling period from 60 seconds to 1 second and set AT
The first system 203 and the second system 204 of the O ground equipment 202 are sequentially polled (503). It is assumed that each system of the ATO ground apparatus 202 always collects data every second, regardless of the polling cycle. When the train 208 stops at the fixed position of the station, data transmission is started between the on-vehicle transmission ground device 601 and the on-ground transmission vehicle device 602 (hereinafter, referred to as coupling detection). The coupling detection is output from the on-vehicle transmission ground unit 601 to each system of the ATO ground unit 202 (512). With this, ATO ground equipment 2
02 detects the stop of the train 208 at a fixed position, and thereafter changes the timeout detection time to 1 second (51).
3). Here, the system of the ATO ground apparatus 202 disconnects the transmission line as a failure upon detecting a timeout three consecutive times. Thereby, each system of the ATO ground apparatus 202 can detect a communication abnormality in 3 seconds. Therefore, when the train 208 stops at the station, the transmission path 2
The system switching based on the failure detection in step 05 becomes possible.

When the train 208 departs from the station and the transmission between the on-vehicle transmission ground device 601 and the on-ground transmission vehicle device 602 is cut off (hereinafter referred to as non-coupling), the on-vehicle transmission ground device 601 is used. Outputs the transmission cutoff to each system of the ATO ground apparatus 202 (514). This makes ATO
Each system of the ground apparatus 202 returns to step 511, and changes the timeout detection time to 60 seconds (511). Thereafter, the train position detection device 207 outputs to the station control device 201 that the train 208 has left the home track 209 of the train 208 (504).
And change the polling cycle to 60 seconds (50
1). As a result, the station control device 201 can lengthen the polling cycle and reduce the load of communication processing without each system of the ATO ground device 202 detecting a timeout.

Although the polling cycle is set to 60 seconds or 1 second as an embodiment of the present invention, it goes without saying that the time of the polling cycle may be set arbitrarily. In addition, the timeout detection time of each system of the secondary system of the dual system is set to 1 second, but may be set to an arbitrarily set time of the polling cycle. 3
When timeout is detected consecutively, system switching is performed as a communication error. However, it is needless to say that the number of times is not limited to three and may be set to an arbitrary number.

[0014]

As described above, according to the present invention,
Without outputting failure information using a separate contact circuit,
Even if the next station changes the polling cycle, timeout detection is performed in accordance with the polling cycle changed by the secondary station. Can be detected, and prompt system switching can be performed. Further, the primary station can reduce the load of the communication processing when the train is not on the train by changing the polling cycle, and can prepare for unsteady processing such as a diamond transfer processing.

[Brief description of the drawings]

FIG. 1 shows a parent-child transmission system according to an embodiment of the present invention.

FIG. 2 is a flowchart of an embodiment of the present invention.

FIG. 3 shows an example of transmission information transmitted from a primary station to a secondary station.

FIG. 4 is an example of transmission information transmitted from a secondary station to a primary station.

FIG. 5 shows a parent-child transmission system according to another embodiment of the present invention.

FIG. 6 is a flowchart of another embodiment of the present invention.

[Explanation of symbols]

201: station control device, 202: double station ATO ground device, 203: station ATO ground device 1 system, 204: station ATO
Ground system 2 system, 205: transmission path, 207: train position detecting device, 208: train, 209: home truck, 601
… Ground-to-vehicle transmission equipment, 602… Ground-to-ground transmission equipment

Claims (3)

[Claims] In a parent-child transmission system in which a secondary station of a dual system is connected to a primary station via a transmission line and a plurality of polling cycles are transmitted, the primary station changes the mode of the polling cycle. At this time, the secondary station changes the setting to a timeout detection time in accordance with the polling cycle of the changed mode, and switches the system when a timeout is detected continuously for an arbitrary number of times. 2. In a parent-child transmission method in which a secondary station of a dual system is connected to a primary station via a transmission line and a polling cycle of a plurality of modes is transmitted, the primary station changes the mode of the polling cycle. When the polling cycle of the changed mode is transmitted to the secondary station through the transmission line, the secondary station corresponds to the polling cycle of the changed mode based on information sent from means other than the primary station. A parent-child transmission method characterized in that the setting is changed to the specified timeout detection time, and the system is switched when a timeout is detected any number of times in succession. 3. The station control device according to claim 2, wherein the primary station is a station control device for inputting the home track information of the train, the secondary system of the dual system is an ATO ground device, and the means other than the primary station is a fixed stop of the train station. A parent-child transmission system characterized by being a ground transmission device for transmitting information to a train.