JPS61148940A - Test method of data transmission network for train control - Google Patents

Abstract

PURPOSE:To obtain a safe test method with high fail safe performance by stopping excitation of a lead wire of a control input switching relay of an on-vehicle equipment at the detection of a transmission fault to switch the input to the on-vehicle equipment from a network to the control lead. CONSTITUTION:A signal FDS is given to a transmission fault detector FDD from a transmission station STO, and the signal FDS is a pulse which is outputted when the transmission cycle is consecutive and stopped when the transmission is intermitted. Then the FDD amplifies the pulse to energize a lead FDW for a switching relay FDR excitation at normal state only. Thus, when a train control data transmission network VLN continues normal transmission, a control signal is given to equipments EQU1 and EQU2 from the network and when the VLN is faulty, relays FDR1, 2 are thrown to the position of TCW lines, from which the control signal is given. The brake contacts of the relays FDR1, 2 are connected to the equipments, then the lines are connected to the lead lines TCW against open relay coil or open FDW, allowing to offer fail safe.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a fail-safe testing method for one node of a train control data transmission network that serially multiplexes train control signals.

[Background of the invention]

One hundred to two hundred individual control wires (
Serial multiplex transmission of control signals that are transmitted using cables (through wires) reduces wire weight and space (increases payload), simplifies electrical couplers, improves control, and provides new services. For example, an on-board data transmission network for train control that enables train control is proposed by Saito et al.
oardQptical Data Communic
ations for 'l'rain
Control J (IEgE IESociet
y、Proceedings of IEEE
1983Industrial EIectronkc
s (:::onference).

Although such a system is considered to be very effective, it is thought that sufficient verification testing and equipment for it will be necessary before it can be actually introduced. However, this paper does not recognize this issue. Demonstration tests in which test vehicles are actually driven require sufficient safety and fail-safe performance.

[Purpose of the invention]

An object of the present invention is to provide a high-speed, safe, and fail-safe test operation method for a data transmission network for train control.

[Summary of the invention]

The gist of the present invention is to provide a selection relay on the controlled equipment side, provide a new lead-through line for energizing the selection relay, and, in the event of a transmission error, stop excitation of the selection relay and switch the input on the equipment side to the lead-through line. It's in the method.

[Embodiments of the invention]

FIG. 1 shows a test method for a train control data transmission network according to an embodiment of the present invention. In the figure, M2O is the train's mask controller and driver's cab equipment, and TOW is the through line, which is the same as the current train control system. Here, each moving crab knit device EQU1. EQU2 is selection relay FD
RI, 2 normally on contact (NC contact, also known as Su contact)
Transfer via Ii! iIK connected via a normally-off contact (NC contact, also known as a contact) to the transmission station STxe8T of the data transmission network VLN for train control.
m parallel interface output terminal POFI.

Connected to 2. The output level of POFI, 2 is the same as the output level of the lead-through line. Usually DClooV. On the other hand, the lead-in line TCW is connected to the parallel input interface terminal FI of transmission station 8TO of VLN near the driver's cab.
Connected to FO. Since this input level is normally DClooV like the lead-through line, a relay or the like becomes an interface element.゛Signal FD8 is sent from transmission station 8TO to transmission abnormality detector FDD.
For example, if the VLN is of a cyclic transmission type, this is a pulse that is output while the transmission cycle continues and stops when the transmission is interrupted. Therefore, F.D.
At D, this is AC amplified and the switching relay excitation lead-in line FDW is excited only during normal conditions. From this k, if VI and N continue transmission normally, the device EQU 1 .

A control signal is given to EQU2 from the network, and V
When the LN is abnormal, relay coils 1 and 2 are switched to open circuit 9
, from which a control signal is given.

Here, since the NC contact of switching relay FDRI, 2 is on the equipment side, disconnection of the relay coil, switching lead-in wire FDW
When the current is interrupted, it switches to the conventional pull-through side, making it 7-ail safe. Also, stoppage of VLN and abnormality detector FDD tK.
It is fail safe. If the transmission method of 7'E and VLN is cyclic, the FDD can be made into 7-il safe AC amplification. In this embodiment, furthermore, since each moving crab unit simultaneously switches to the lead-through line FDW side due to a transmission abnormality, there is no variation between units.

゛Figure 2 shows that transmission abnormalities are detected at each transmission station and the flow of control signals is routed from the network VLN to the lead-in line TOW.
Another embodiment of the present invention is shown in which the switch can be made to the side. In this embodiment, the transmission station that has detected a transmission abnormality uses a method of short-circuiting the switching lead-in line FDW to ground. 8C
C1-2 are short circuits of FDW. The short circuit can be made fail-safe by using the NC contact of the relay, as in the case of FDR1,2. Note that a protection circuit against short-circuit current is required on the FDD side, but this can be done with a normal circuit protector, etc. (not shown). now,
The purpose of the transmission stage is to detect transmission interruptions and errors using check bits (parity errors, periodic large-time check errors, etc.)
, When a parallel output interlock error due to a bit error is detected, the switching lead-in line FDW is short-circuited by the short-circuit SCC. In this way, switching relay F
Since DRI, 2 is de-energized and turned off, the control signal for the device is given from the lead-in line.

In this embodiment, since transmission abnormality detection is performed in parallel and distributed at each station, no abnormality detection is missed, and switching due to abnormality detection is speeded up.

In this embodiment, if the time from the occurrence of a transmission abnormality to the switching to the feed line side is long, there is a risk that the line breakers and contactors of the train drive main circuit will open. This problem can be solved by slowing down the abnormality detection speed of the network and using high-speed relays in the FDW to make the switching speed faster than the operating speed of the main circuit breaker and contactors.

〔Effect of the invention〕

According to the present invention, a method for testing a data transmission network for train control that is highly safe and safe can be obtained.

[Brief explanation of the drawing]

FIGS. 1 and 2 are system diagrams showing one embodiment of the present invention. VLN...Control data transmission network, STO~8
T2...Transmission station, PIFO...Parallel input interface, POFl, 2...Parallel output interface, TCW...Lead-through line, FDW...Switching lead-in line, FDR-...Switching relay, FDD... Transmission objection procedure amendment (method) % formula % Incident display 1982 Patent application No. 270903 ``0 Name Train control data transmission network m It (〒1
001 No. 5-1, Marunouchi-chome, Chiyoda-ku, Tokyo, Detailed Description of the Invention column, page 3, line 2 of the specification is crossed out and corrected as follows: 1. For example, Saito et al., ``On-Board Optical, Data Communications Networks for Train Control'' (IEE Society, Proceedings on IEE 1983 Industrial Electronics Conference).

Claims (1)

[Claims] 1. A method for testing a train control data transmission network having transmission stations with parallel input/output interfaces by mounting it on a vehicle having a control lead-in line, comprising: A device for detecting an abnormality, a lead-in line for a switching relay supplied with power by the transmission abnormality detection device, and a control input of the on-board equipment excited by the lead-in line to the parallel output interface of the transmission station and the lead-in line. A train is provided with a switching relay for switching, and when the transmission abnormality is detected, excitation of the lead-in line for the switching relay is stopped, and input of onboard equipment is switched from the network to the control lead-in line. Test method for control data transmission network. 2. The train control according to claim 1, wherein the transmission station is connected to the through line for the switching relay and is provided with means for short-circuiting the through line when a transmission abnormality is detected. Test method for data transmission networks. 3. The operating time from detection of a transmission abnormality in the network to switching to the control lead-in line is shorter than the opening time of the train drive main circuit disconnector or contactor. A method for testing a data transmission network for train control according to claim 1.