JPH05260601A - Multiplex transmitter with trouble detecting function - Google Patents

Abstract

PURPOSE:To conduct a protective operation of a notch-off, an emergency brake, etc., even when command information of power drive and a brake, etc., is not correctly transmitted to a terminal unit by immediately detecting a fault of a transmission system. CONSTITUTION:A multiplex transmitter transmits command information to be output from a command device 1 to a terminal unit 5 through transmission terminal units 2A, 2B by using a multiplex transmission system 3 of an optical cable, etc., to transmit control signals between vehicles of trains and in the vehicles. An excitation bit in which a logical value is continuously alternately inverted at each transmission scanning period is provided in a special bit of a transmission format of the information of the device 1. Trouble sensing means for deciding whether the logical value of the excitation bit is periodically inverted or not to detect whether a fault exists in the system or not and outputting a protective operation command to the device 5 if the fault exists in the line is provided in a transmission line from the units 2A, 2B to the unit 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multiplex transmission device with a failure detection function, which is used for transmission of control signals between train cars and train cars.

[0002]

2. Description of the Related Art In recent years, a multiple transmission system such as an optical loop has been used for transmitting control signals between train cars and train cars, and the wiring lines between cars and trains that have been conventionally required have been eliminated to remove trains. There is a movement to reduce the weight.

However, when a multiplex transmission system is used for transmission of control signals between the train cars and inside the train cars, for example, when a failure occurs in the transmission system, command information such as power running and brakes from the master controller is correctly transmitted. There is a possibility that it may not occur, or the train may run out of control and cause a serious accident.

[0004]

Therefore, when a multiplex transmission system is used for transmission of control signals between train cars and in train cars, a failure may occur in the transmission system, for example. Even if the command information such as the brake is not correctly transmitted, it is necessary to immediately detect the failure of the transmission system so that a serious accident does not occur and to perform a protective operation such as notch off or emergency braking.

The present invention immediately detects a fault in the transmission system and performs a protective operation such as notch off or emergency braking even if command information such as power running and braking is not correctly transmitted to the terminal equipment, so as not to lead to a serious train accident. Another object of the present invention is to provide a multiplex transmission device with a failure detection function that can ensure fail-safe.

[0006]

In order to achieve the above-mentioned object, the present invention uses a multiplex transmission system such as an optical cable for transmitting control signals between train cars and in train cars to transmit command information from command devices. In a multiplex transmission device that transmits to a terminal device via a transmission terminal device of a vehicle, a logical value is continuously and alternately inverted at a specific scan bit in a specific bit on a transmission format of command information issued from the command device. The excitation bit is provided to determine whether or not there is a failure in the transmission system by determining whether the logical value of the excitation bit is periodically inverted in the transmission path from each transmission terminal device to the terminal device. A failure detecting means for detecting and outputting a protection operation command to the terminal device when there is a failure in the transmission path is provided.

[0007]

In the multiplex transmission device with a failure detection function having such a configuration, it is determined whether or not the command information issued from the command device is correctly transmitted to the terminal device side via the multiplex transmission system. It becomes possible to detect from the state of the logical value of the excitation bit provided in the format, and when the failure occurs in the multiplex transmission system from the command device to the terminal device and the command information from the command device is not transmitted correctly. It is possible to avoid serious accidents such as a train running out of control by performing notch-off, emergency braking, and other protective operations on the terminal equipment.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration example of a multiplex transmission device with a failure detection function according to the present invention.

In FIG. 1, 1 is a commanding device that controls command information such as a master controller, 2A and 2B are transmission terminal devices, and 3
Is a transmission line by an optical double loop or the like for transmitting command information from the command device 1 to the transmission terminal devices 2A and 2B, 4 is a converter for giving information from the transmission terminal device 2B to the terminal device 5, and 5 is a command device It is a terminal device that runs or stops the vehicle based on information from the.

Here, the command device 1 outputs command information such as power running and braking as an electric signal to the transmission terminal device 2A, and the transmission terminal device 2A converts the electric signal into a transmission signal such as light. , To the transmission terminal device 2B of each vehicle via the transmission path 3. When the transmission terminal device 2B of each vehicle receives a transmission signal such as light from the transmission terminal device 2A, the transmission terminal device 2B converts the signal into an electric signal again and gives it to the converter 4. The converter 4 has a function of detecting whether or not a failure has occurred in the transmission system when receiving information from the transmission terminal device 2B, and when detecting the failure, command information such as notch-off or emergency brake is sent to the terminal device 5. To give.

In the multiplex transmission apparatus with a failure detection function having such a configuration, in the present embodiment, an excitation bit for failure detection is provided in a specific bit on the transmission format of command information such as power running and brake issued from the command device 1. , The logical value of this bit is "1", "0",
The excitation bit is transmitted to the converter 4 via the transmission terminal device 2A, the transmission line 3 and the transmission terminal device 2B so as to be continuously alternately inverted with "1", and the failure detection function inside the converter 4 is used. By detecting whether or not the logical value of the excitation bit from the command device 1 is periodically inverted for each transmission scan, it is intended to detect a failure in the transmission path.

FIG. 2 is a block diagram showing an example of the internal structure of the converter 4 having the above-mentioned failure detection function. In FIG. 2, 6A is a transmission control unit that controls transmission of information from the transmission terminal device 2B, and 7 is a logic value of an excitation bit provided on a specific bit of a transmission format of command information from a command device is periodically inverted. A failure detection unit that determines whether or not there is a failure in the transmission system by determining whether or not the current is present, 8 is an AC excitation unit driven by an excitation bit, 9 is a rectification unit for rectifying AC excitation to DC, and 10 is this A failure detection relay, which is excited by the DC output from the rectifying unit 9 and gives a display signal to an external display (not shown) by its output contact, 6B is a transmission control unit for transmitting command information to the terminal device 5. Next, the operation of the multiplex transmission device with a failure detection function configured as described above will be described.

Now, when the command information from the command device 1 is input to the transmission terminal device 2A, the transmission terminal device 2A uses the electric signal as a transmission signal such as light via the transmission path 3 for each vehicle. 2B, where it is again converted into an electric signal and given to the converter 4 having a failure detection function. In this case, the logical value of the excitation bit provided in the command information is alternately inverted for each transmission scan.

In the converter 4, when the transmission control unit 6A receives an electric signal from the transmission terminal device 2B, the electric signal is further input to the failure detection unit 7. The failure detection unit 7 detects the excitation bit in the transmitted command information and periodically sets the logical value to "1" for each transmission scan cycle.
If it is transmitted by alternately inverting "0" and "1", it is determined to be normal, the information of the command device is transmitted to the terminal device as it is via the transmission control unit 6B, and the excitation bit is transmitted to the AC excitation unit 8 Send to.

Therefore, if the excitation bit is sent out, the failure detection relay 10 remains excited through the rectifying unit 9 and the external output contact is closed, so that the transmission system is displayed by displaying the contact output. You can confirm that it is normal.

Further, in the failure detection section 7, when the excitation bit in the transmitted command information does not periodically alternate with "1", "0", "1" for each transmission scan (for example, " 1 "," 0 "," 0 "), it is determined that some trouble has occurred in the transmission system and the excitation bit is not correctly transmitted from the command device 1. And
If the command information from the command device 1 is in the powering mode, the notch-off command is transmitted to the terminal device 5 via the transmission control unit 6B, and if the brake is being applied, the emergency brake command is transmitted to the terminal device 5. To stop sending. When the transmission of the excitation bit is interrupted, the output of the rectifying unit 9 is lost, the failure detection relay 10 is demagnetized, and the external output contact is opened, so that it can be confirmed that a failure has occurred in the transmission system.

As described above, according to this embodiment, the command device 1
An excitation bit is provided in a specific bit on the transmission format of the command information of 1, and the command information is transmitted so that the logical value of the excitation bit is continuously and alternately inverted every transmission scan cycle, and this is transmitted to the converter 4. It is possible to detect the failure of the transmission system from the command device to the terminal device by applying it and determining whether the excitation bit is transmitted correctly.If the failure of the transmission system is detected, notch off to the terminal device. It is possible to prevent serious accidents such as train runaway by performing protective actions such as emergency braking and emergency braking.

[0018]

As described above, according to the present invention, even if the command information from the command device cannot be correctly transmitted to the terminal device due to the failure of the transmission system by a very simple means, the train may run away. Since it is possible to prevent the occurrence of a serious accident, it is possible to provide a highly reliable multiplex transmission device with a failure detection function that can ensure fail-safe of the entire transmission system.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of a multiplex transmission apparatus with a failure detection function according to the present invention.

FIG. 2 is a block diagram showing an internal configuration of a converter in the embodiment.

[Explanation of symbols]

1 ... Commanding device, 2A, 2B ... Transmission terminal device, 3 ...
Transmission system, 4 ... Converter, 5 ... Terminal device, 6A, 6B ...
... Transmission control section, 7 ... Fault detection section, 8 ... AC excitation section,
9 ... Rectifier, 10 ... Failure detection relay.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshio Tobita No. 1 Toshiba-cho, Fuchu-shi, Tokyo Toshiba Corporation Fuchu factory

Claims (1)

[Claims] 1. A multiplex transmission for transmitting command information from a commanding device to a terminal device via a transmission terminal device of each car by using a multiplex transmission system such as an optical cable for transmitting control signals between train cars and inside a train car. In the device, an excitation bit is provided in a specific bit on the transmission format of the command information issued from the command device so that the logical value is alternately inverted every transmission scan cycle, and each of the transmission terminal devices is connected to the terminal device. To the terminal equipment when the logical value of the excitation bit is periodically inverted in the transmission path to the terminal to detect whether there is a failure in the transmission system and if there is a failure in the transmission path. A multiplex transmission device with a failure detection function, which is provided with a failure detection means for outputting a protection operation command.