JPH0472441B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a signal processing device for a train security system, and more particularly to a fail-safe signal processing device for a train security system.

[Background of the invention]

Train security systems are examples of things that require fail-safe signal processing equipment. As shown in FIG. 3, this type of train safety device includes a control section 1,
An operation switch 2, a receiving section 3, an antenna 4,
A speed generator 5 is provided. This train safety device is mounted on the train 6 and controls the brake device 8 and the like based on information from the track 7.

The operation of such a device will be briefly explained below. Information such as train speed limits is transmitted from the ground to the track 7, and is picked up by the antenna 4 on the train 6. The signal picked up by the antenna is discriminated by a receiving section 3 on the vehicle 6, and the result is outputted to the control section 1. The control unit 1 compares the signal received from the reception unit 3 with the train speed information provided from the speed generator 5, compares it with the speed limit in the section, and drives the brake device 8 if the train speed exceeds the speed limit. It has the function of outputting a signal.

The above is the basic function of what is called a train safety system, or an automatic train control system. Normally, the signal is activated by the crew's operation in case of an emergency or a failure of the ground or receiver 3. An operating switch 2 is provided which makes it possible to control the train 6 independently of the indications.

For example, by operating the operating switch 2, it is possible to run the train 6 below a certain speed, and when that speed is exceeded, the brake device 8 is automatically driven to apply the brakes.

Next, the configuration of the control section 1 of the train safety device will be explained.

FIG. 4 is a block diagram showing the configuration of the control section 1 of the train safety system.

In FIG. 4, a signal 40 _a ~
40 _o is input to each of the AND gates 31 _a to 31 _o as speed limit information. on the other hand,
The output of the memory 21 is connected to the gate on the opposite side of the AND gates 31 _a to 31 _o , and only one of the subscripts _a to _o exists as a signal manifestation, and any one of the subscripts a to o exists as a signal manifestation. ANDGATE 31 _a ~3
From 1 _o , the data stored in the memory 21 in advance is output as a signal 43 via the OR gate 35, and is input to the frequency generator 22 via the AND gate 36 and the OR gate 38, which generates a frequency 45 corresponding to the speed limit at that time. is output. This frequency 45 and the train speed frequency 46 input from the speed generator 5 are compared by the comparator 23, and depending on the magnitude, a brake command is output, which is amplified by the current transformer amplifier 24 and relayed to the brake command relay. 25
control. Note that 26 is a data check circuit.

In the above configuration, the signal 41 is a signal from the crew's emergency operation switch 2, and since this command is not normally issued, the signal 41 is logic "1" and the gate 36 outputs the signal 43. It's getting old. When the operation switch 2 is used, the signal 41 becomes logic "0", so conversely, the gate 3
7, the data 42 of the memory 2 is outputted. At this time, the signal 41 _a from the receiver 3
~40 No matter what _o is, the data 42
is given priority, and this data 42 is sent to gates 37 and 38.
The brake device 8 is driven at a speed limit corresponding to this data 42 to control the brakes.

FIG. 5 is a circuit diagram showing an example of an input circuit from the operating switch 2. In FIG. In FIG. 5, switch 5
1, the circuit is closed, and the relay 52 is energized in an emergency. However,
A current is applied to the photocoupler 54 through the make contact 53 of the relay 52. The phototransistor of the photocoupler 54 converts this signal to a logic circuit level.

In this circuit, even if the coil is disconnected or a contact failure occurs, the relay 52 will only be released from emergency operation, but in the opposite case, it will go into emergency operation even though it is not being treated as an emergency. That can't happen.

However, if a short circuit occurs in the phototransistor of the photocoupler 54, conditions may be set as if the switch 51 were being used even though the switch 51 was not being used. This includes the possibility that a similar phenomenon will occur when not only a photocoupler but also a level conversion IC (integrated circuit) is used.

[Purpose of the invention]

The present invention has been made in view of the above points, and an object thereof is to provide a signal processing device for a train safety device that operates reliably.

[Summary of the invention]

The feature of the present invention is that emergency signals are configured with fail-safe circuit elements such as relays as much as possible, and gate logic by IC is
The point is that the logic up to the gate, which serves as a signal switching means for switching data, is made into a completely independent route.

[Embodiments of the invention]

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a circuit diagram showing an embodiment of a signal processing device for a train safety device according to the present invention.

An embodiment of the signal processing device of the present invention shown in FIG. 1 is applied to the train safety device shown in FIGS. 3 and 4. As described above, the train safety device controls the brake device 8 by the control unit 1 to control the speed of the train to a commanded speed.

The control section 1 includes a control data generation section 11, a signal switching section 12, and a brake control section 13.

The control data generation unit 11 generates information about at least two control states: control based on control information picked up from the ground using the antenna 4 and reception unit 3, and control based on signals from the operation switch 2 operated by the crew. It generates and outputs control data. In this embodiment, two control states will be shown.

The signal switching section 12 is a logic circuit, and is configured as, for example, an integrated circuit. The signal switching section 12 selects and outputs one of the control data for each of the two control states, depending on the presence or absence of a signal from the operation switch 2. Here, the operating switch 2 outputs a signal for selecting one of the two control states.

The brake control unit 13 takes in the control data selected and output by the signal switching unit 12 and the actual speed of the train, compares them, and outputs a brake command to control the brake device 8. be.

The operation switch signal input circuit 50 has at least two systems (two systems in this embodiment) of level conversion circuits 54. These two systems of level conversion circuits 54
are provided corresponding to two control states, and send the signal from the operation switch 2 to the signal switching section 12, respectively.
It converts it to a level that can be handled by.

In this embodiment, the operation switch signal input circuit 50
has a relay 52. The relay 52 has a make contact 53 _{a and a break contact 53 b as} contacts 53 that open and close in response to a signal from the operating switch 2 .

Further, in this embodiment, the two systems of level conversion circuits 54 each have photocouplers 54 _a and 54 _b as level conversion elements. These photocouplers 54 _a and 54 _b are connected to the make contact 53 _a and the break contact 53 _b , and their opening/closing operations are controlled by a logic signal at a level that can be handled by the signal switching unit 12, that is, logic "1". ” and “0” logic signals. Here, photo coupler 54
As _a and _54b , for example, a light emitting diode is used on the primary side and a phototransistor is placed on the secondary side.

The difference between this embodiment configured as described above and the one shown in FIG. 5 is that current is caused to flow through the photo couplers 54 _a and 54 _b through the make contact 53 _a and the brake contact 53 _b of the relay 52, respectively. , and each photocoupler 54 _a , 5
The circuit configuration is such that the output of _4b is input to a gate 36 that passes data 43 corresponding to the output of the receiving section 3 and a gate 37 that passes data 42 that provides a constant speed for emergency use. There is no change. That is, the signal from the operation switch 2 is logically routed through two routes, so that the switching circuits 36 and 37 can be switched between normal operation and emergency operation.

With this configuration, when there is no failure in the circuit, one of the gates 36 and 37 is always open, and the data of either signal 42 or 43 is output as signal 44. It is becoming more and more like this. In the unlikely event that the photo coupler 54 _a ,
If one of the gates 54 _b fails and the output is reversed, the state in which only one of the gates 36 and 37 is open breaks down, and both gates 36 and 37 open.
If 37 is opened or both are closed, it will be in an itta state. When both gates 36 and 37 are open, both data 43 corresponding to the output of the normal receiver 3 and emergency data 42 are output as the signal 44, and the data 42 and 43 are parity data. If an error occurs in the data or CRC code, the data check circuit 26 detects this error. Furthermore, when both gates 36 and 37 are closed, the "0" level signal 21 is output as the signal 44,
The parity or CRC code becomes abnormal and a failure is detected.

According to this embodiment, if a failure should occur in the circuit, the failure is immediately detected and a signal for driving the brake device 8 is output, thereby ensuring reliable operation.

FIG. 2 is a circuit diagram showing another embodiment of the present invention.

_The difference _between the embodiment _shown in FIG _. 2 and the embodiment shown in FIG. Connect in series between the power supply and ground, photocoupler 54 _a ,
One of the transistor outputs of _54b is directly connected to the gate 36, and the other is connected to the gate 37 via the inverter 39,
Other configurations remain unchanged. The operation in response to a failure of each element is the same as in the previous example.

In this embodiment, photocouplers _54a , _54b
Since the input current circuit is shared, current limiting resistors and the like can also be shared, which is effective in reducing the size of the device.

In any of the above-mentioned embodiments, it is not necessary to use a photocoupler for input, and this embodiment is realized by means for level conversion between the voltage level that can use contacts and the level used in the logic IC. Needless to say, it is possible.

〔Effect of the invention〕

As described above, according to the present invention, even if the receiver output provides a normal speed limit signal and has a switching means that forcibly provides a speed limit regardless of this, even if the circuit should fail. It also works safely and reliably.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing one embodiment of a signal processing circuit for a train safety device according to the present invention, FIG. 2 is a circuit diagram showing another embodiment of the present invention, and FIG. 3 is a circuit diagram showing the configuration of the train safety device. FIG. 4 is a block diagram showing the configuration of a control section of the train safety system, and FIG. 5 is a circuit diagram showing an example of an input circuit from an operating switch. DESCRIPTION OF SYMBOLS 1... Control part, 2... Operation switch, 3... Receiving part, 4... Antenna, 5... Speed generator, 6...
...Train, 7...Track, 8...Memory device, 11...
...Control data generation section, 12...Signal switching section, 13
...Brake control unit, 21...Memory, 22...
...Frequency generation section, 23... Frequency comparison section, 24...
... AC amplifier, 25 ... Brake command relay,
26...Data check circuit, 50...Operation switch signal input circuit, 54...Level conversion circuit.

Claims (1)

[Scope of Claims] 1. A signal processing device for a train safety device equipped with an operation switch signal input circuit 50, in which the train safety device controls the brake device 8 by the control unit 1 to command the speed of the train. The control unit 1 includes a control data generation unit 11, a signal switching unit 12, and a brake control unit 13, and the control data generation unit 11 generates data based on control information picked up from the ground. and based on the signal from the operation switch 2 operated by the crew.
It generates and outputs control data 42 and 43 for at least two control states, and the signal switching section 12 is a logic circuit that includes a control data generation section 11 and an operation switch signal input circuit 5.
According to the presence or absence of a signal from the operation switch 2, one of the control data 42 and 43 for each of the above two control states is selected and sent to the brake control unit 13 as a signal 44.
The operation switch signal input circuit 50 is connected to the rear stage of the operation switch 2 and the front stage of the signal switching section 12, and has at least two systems of level conversion circuits 54, each level conversion circuit 54 1 is a signal processing device for a train safety device which converts the signal from the operation switch 2 to a level that can be handled by the signal switching section 12 and outputs the signal. 2. The signal processing device for a train safety device according to claim 1, wherein the signal switching unit 12 is constituted by an integrated circuit including at least a logic gate circuit. 3 In claim 2, the operation switch signal input circuit 50 further includes a relay 52, and the relay 52 has a contact 53 that opens and closes in response to the signal from the operation switch 2, and includes at least two systems. The level conversion circuit 54 has level conversion elements 54a, 54b, . . . , which convert the opening/closing operation of the contact 53 into a logic signal of a level that can be handled by the signal switching unit 12. Signal processing equipment for train safety equipment. 4 In claim 3, the relay 52
has a make contact 53a and a break contact 53b as the contacts 53, and the level conversion elements 54a and 54b are connected to the make contact 53a and the break contact 53b in correspondence with the operation switch signal. The input circuit 50 controls the switch operation of the operation switch 2 with logic "1" and "0".
A signal processing device for train safety equipment that converts into any of the logical signals. 5 In claim 3, the relay 52
has one contact 53a, and the level conversion elements 54a, 54b have one contact 53a.
3a, and is equipped with a negative logic means 39 on one output side thereof, and the operation switch signal input circuit 50 inputs the switch operation of the operation switch 2 to logic "1" and "1". “0”
A signal processing device for train safety equipment that converts into any of the logical signals.