Peripheral supervision switching device and method for redundant vehicle-mounted signal system

Abstract

The invention discloses a redundant vehicle-mounted signal system peripheral supervising and switching device which comprises two VOBC systems, two control command output ends of each VOBC system are connected with two ends of a relay, the other end of the relay is further connected with a relay normally-closed contact, and the relay normally-closed contact is connected with the two ends of the VOBC system. The plurality of relay normally-closed contacts are connected in series between the two VOBC systems. The invention further discloses a peripheral supervision switching method for the redundant vehicle-mounted signal system. According to the method, the availability of the redundant vehicle-mounted signal system is improved by utilizing the existing hardware conditions.

Description

Technical Field

[0001] The invention relates to a redundant vehicle-mounted signal system peripheral equipment supervision switching device and method. Background Art

[0002] As a key subsystem of the CBTC (communication-based train control) system, VOBC (vehicle equipment controller) often adopts redundant configuration. A VOBC is set at each end of the train, and the two VOBCs transmit control commands to the vehicle through independent interface relays, as follows Figure 1 As shown. In normal operation, one VOBC works in the main state and outputs commands to the vehicle, and the other VOBC works in the standby state, and all output commands are disconnected. When the main VOBC fails, it becomes the standby, and the standby VOBC becomes the main and takes over the train control.

[0003] To meet the requirements of fault-oriented safety, VOBC needs to monitor the status of the interface relay, that is, to compare the normally closed contacts of the acquisition relay with the output command. When the acquisition status is inconsistent with the command, VOBC should determine that the relay is faulty and then switch to the standby state.

[0004] In a redundant architecture, if the interface relay at either end fails, the train line may be excited and an "allow" command (such as door permission, traction permission, etc.) may be given. However, since the two VOBCs are located at both ends of the train, the VOBCs can only collect the contact status of the interface relays at this end. Therefore, in the current implementation, VOBCs mostly send the fault status of the relays at this end to each other through the network, and the standby VOBC only takes over the train when the original main end does not report the interface relay failure.

[0005] In this implementation, the interface relay failure still relies on the judgment of the original master end. Under the requirement of fault-oriented safety, there is a situation where the actual relay is not faulty, but the acquisition channel is faulty and other reasons cause the software to judge it as a relay failure, which in turn causes the master end to fail and the standby end cannot control the vehicle normally after receiving the interface relay failure reported by the master end.

[0006] Therefore, a redundant vehicle-mounted signal system peripheral monitoring switching device and method are provided. Summary of the invention

[0007] The purpose of the present invention is to overcome the existing defects and provide a redundant vehicle signal system peripheral supervision switching device and method, using existing hardware conditions to improve the availability of the redundant vehicle signal system.

[0008] The technical solution to achieve the above purpose is:

[0009] One of the present inventions is a redundant vehicle-mounted signal system peripheral supervision switching device, including: two VOBC systems, each of the two control command output ends of the VOBC system is connected to the two ends of an interface relay, and the other end of the interface relay is also connected to a relay normally closed contact, and multiple relay normally closed contacts are connected in series between the two VOBC systems.

[0010] Preferably, of the two VOBC systems, one is used as a primary system and the other is used as a backup system.

[0011] A redundant vehicle signal system peripheral supervision switching method according to another aspect of the present invention comprises:

[0012] Step S1, connect the normally closed contact of the relay whose status needs to be monitored in series to the VOBC activation train line, that is, connect it in series between the two VOBC systems to send the status of the relays at both ends of the interface to each other;

[0013] Step S2, if all the interface relays are normally dropped, the activation train line is energized, and the standby VOBC system detects that the VOBC activation train line is excited, it can be determined that the VOBC system at the opposite end has been switched to standby, and all the interface relays at the opposite end are normally dropped, and the standby VOBC system takes over the train;

[0014] Step S3, if any of the interface relays fails and sticks, the activated train line cannot be powered, and the standby VOBC system does not actively take over the train, waiting for the fault to be restored or manual intervention to achieve system switching.

[0015] Preferably, in step S1, when the interface relays at both ends are in normal state, the main VOBC system disconnects the activation state output to demagnetize the activated train line.

[0016] Preferably, in step S1, when the interface relays at both ends are in an abnormal state, that is, when switching is required, the main VOBC system switches to standby and then the activation state output is connected through the normally closed contacts of the relay.

[0017] The beneficial effects of the present invention are as follows: the present invention directly monitors the status of the opposite-end relay through the VOBC system, is not affected by faults such as the faulty input channel and the underlying board, improves system availability, and utilizes existing hardware conditions without the need to add hardware equipment such as relays and train lines. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the conventional situation of the present invention in which two VOBCs transmit control commands to the vehicle through independent interface relays respectively;

[0019] Figure 2 It is a flow chart of a redundant vehicle signal system peripheral supervision switching method of the present invention;

[0020] Figure 3 It is a schematic diagram of connecting the normally closed contacts of the relays whose status needs to be monitored in series with the VOBC to activate the train line in the present invention. DETAILED DESCRIPTION

[0021] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0022] The present invention will be further described below in conjunction with the accompanying drawings.

[0023] like Figure 2 As shown, a redundant vehicle signal system peripheral supervision switching device includes: two VOBC systems 1, two control command output terminals 2 of each VOBC system 1 are connected to the two ends of an interface relay 3, and the other end of an interface relay 3 is also connected to a relay normally closed contact 4, and multiple relay normally closed contacts 4 are connected in series between the two VOBC systems 1.

[0024] In the embodiment, among the two VOBC systems 1, one is a primary system and the other is a backup system.

[0025] like Figure 3 As shown, a redundant vehicle signal system peripheral supervision switching method includes:

[0026] Step S1, connect the normally closed contact 4 of the relay whose status needs to be monitored in series to the VOBC activation train line, that is, connect it in series between the two VOBC systems 1 to send the status of the interface relays at both ends to each other;

[0027] In the embodiment, when the state of the two-terminal interface relays 3 is normal, the main VOBC system 1 disconnects the activation state output, causing the activated train line to be demagnetized.

[0028] In the embodiment, when the state of the two-terminal interface relay 3 is abnormal, that is, when switching is required, the active VOBC system 1 is switched to standby and the activation state output is turned on through the relay normally closed contact 4 .

[0029] Step S2, if all the interface relays 3 are normally dropped, the activation train line is energized, and the standby VOBC system 1 detects that the VOBC activation train line is excited, it can be determined that the opposite VOBC system 1 has been switched to standby, and all the interface relays 3 at the opposite end are normally dropped, and the standby VOBC system 1 takes over the train;

[0030] Step S3, if any interface relay 3 fails and sticks, the activated train line cannot be powered, and the standby VOBC system 1 does not actively take over the train, waiting for the fault to be restored or manual intervention to realize system switching.

[0031] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments may still be modified, or some or all of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A redundant vehicle signal system peripheral supervision switching device, characterized in that: include: Two VOBC systems (1), each of the two control command output terminals (2) of the VOBC system (1) is connected to the two ends of an interface relay (3), the other end of the interface relay (3) is also connected to a relay normally closed contact (4), and a plurality of the relay normally closed contacts (4) are connected in series between the two VOBC systems (1).

2. A redundant vehicle signal system peripheral monitoring switching device according to claim 1, characterized in that: Of the two VOBC systems (1), one is a primary system and the other is a backup system.

3. A redundant vehicle signal system peripheral supervision switching method, characterized in that: include: Step S1, connect the normally closed contact (4) of the relay whose status needs to be monitored in series to the VOBC activation train line, that is, connect it in series between the two VOBC systems (1) to mutually transmit the status of the relays at both ends of the interface; Step S2, if all the interface relays (3) are normally dropped, the activation train line is energized, and the standby VOBC system (1) detects that the VOBC activation train line is excited, it can be determined that the VOBC system (1) at the opposite end has been switched to standby, and all the interface relays (3) at the opposite end are normally dropped, and the standby VOBC system (1) takes over the train; Step S3, if any of the interface relays (3) fails and sticks, the activated train line cannot be powered, and the standby VOBC system (1) does not actively take over the train, waiting for the fault to be restored or manual intervention to achieve system switching.

4. A redundant vehicle signal system peripheral supervision switching method according to claim 3, characterized in that: In the step S1, when the states of the interface relays (3) at both ends are in a normal state, the main VOBC system (1) disconnects the activation state output to demagnetize the activated train line.

5. A redundant vehicle signal system peripheral supervision switching method according to claim 3, characterized in that: In the step S1, when the states of the interface relays (3) at both ends are in an abnormal state, that is, when switching is required, the main VOBC system (1) is switched to standby and the activation state output is turned on through the normally closed contact (4) of the relay.

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