JPS596701A - Automatic train control device - Google Patents

Abstract

PURPOSE:To employ semiconductors in an automatic train control device by generating by a speed control unit a signal of the same frequency as an ATC signal to interpolate a no signal portion of the ATC signals when the ATC signal from a signal control unit becomes no signal state. CONSTITUTION:The output of a rotary switch 18 in a signal control unit 8 is inputted to a photocoupler 16, and inputted to a level detector 19. The output of the photocoupler 16 is applied to a frequency adder 20, and the output of a gate 21 is applied to the other input of the adder 20. The output of the adder 20 is inputted to a signal repetitive control circuit 22 of a speed control unit 10. The output of the memory 23 is inputted to the control circuit 22 and the output of the control circuit 22 is inputted to a limit speed signal generator 24 and an interpolation signal generator 25. The output of the generator 25 is inputted to the gate 21, and the output of the detector 19 is also inputted to the gate 21. The output of the generator 24 is inputted to a speed comparator 26, and the output of a speed generator 11 is inputted to the comparator 26. In this manner, the control unit 8, 10 and the junction unit of the both units all employ semiconductors.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic train control system, and more particularly to the configuration of a signal transmission circuit between an ATC signal receiving section and a speed checking section.

FIG. 1 is an explanatory diagram showing a schematic configuration example of a conventional automatic train control device (ATC). The train runs on rails 3 by means of wheels 2 attached to the lower part of the car body 1. An ATC transmitter 4 is connected to the rail 3, and a signal current 5 transmitted by the ATC transmitter 4 passes through the rail. An electron receiver 6 is installed near the tip of the vehicle body 1 in front of the wheels 2 so as to face the rail 3 with a predetermined gap therebetween, and an output signal of the electron receiver 6 is output to a receiver 7. Receiving section 7
The output of the signal checking section 8 is inputted to the signal checking section 8, and the output of the signal checking section 8 is inputted to the display 9 and the speed checking section 1o. The speed checking unit 1o includes a speed generator 1 connected to the wheels 2.
1 is also input, and the output is input to the brake device 12.

The brake device 12 outputs an operation signal to a brake installed close to the wheel 2.

Next, the operation of the apparatus shown in FIG. 1 will be explained. A.T.
The C transmitter 4 causes a signal current 5 to flow through the rail 3. The relationship between the modulation frequency of the signal current 5 (this is called the ATC frequency) and the speed limit is determined as shown in the table. The signal checking unit 8 identifies the ATC frequency and outputs the identification result to the speed checking unit 10. The speed checking unit 1o generates a speed limit frequency corresponding to the identification result, compares this speed limit frequency with the output of the speed generator 11, and, if the vehicle speed exceeds the speed limit, activates the next stage brake. A brake command is output to the device 12. Also, if the vehicle speed is below the speed limit, the brake command is released. The signal checking unit 8 displays the speed limit for the section in question on a display device 9 installed in the driver's cab.

By the way, in the above-mentioned conventional automatic train control device, an electromagnetic relay is used for signal transmission between the signal checking section 8 and the speed checking section 1o, and FIG. 3 is a diagram showing the principle configuration of this part. be. In FIG. 3, the signal from the receiving section 7 passes through the filter section 13 in the signal processing and checking section 8, and is input to the solenoid section of each relay of the output relay section 14, which is composed of a plurality of electromagnetic relays. has been done. This output relay part 1
The contact side of each relay 4 is connected to the solenoid side of each relay of a repeat relay part 15 which is composed of a plurality of electromagnetic relays in the speed checking section lo.

The operation of this part is as follows: the filter section 1 that detected the ATC signal.
3 drives the electromagnetic relay of the output relay part 14. Then, the electromagnetic relay of the repeat relay section 15 of the speed checking section 10 is driven by the contact signal of the electromagnetic relay of the signal checking section 8, and the same operation as the output relay 14 is repeatedly performed. Therefore, the signal verification section 8 and the speed verification section 10 are electrically insulated. This limits the function of the signal check section 8 to the repetitive operation of ground signals (ATC signals) on the train, and prevents functional conflict with the functions of the speed check section 0, which are related to train control functions. . However, even though most of the functions of the receiving section 7 and the speed checking section 10 are semiconductor-based, the conventional system using the above-mentioned large number of electromagnetic relays to prevent functional cross-contact cannot be applied to automatic train control systems. It has become difficult to downsize and save power. By the way, the command from the signal checking section 8 is transmitted to the speed checking section 1 using a frequency signal.
If the method is adopted in which 0 receives the signal, the 7-all-safe (function to control in a safe direction) insulation between both parts can be constructed using a semiconductor element such as a photocoupler.

A conventional electromagnetic relay contact is an asymmetrical error element in which the probability of a non-conducting failure and a conductive failure due to welding is considered to be 1000 to 1 or more.Using this property, the signal checking section 8 and speed checking section ll0I in Fig. 3 are used. 1 signal transmission between 0 and 0 can be carried out safely. By the way, a semiconductor element such as the photocoupler is a symmetrical error element that cannot specify whether a conduction failure or a non-conduction failure occurs. 10
In addition to transmitting signals between the two as alternating signals, fail-safe operation can also be achieved by using semiconductor elements. Furthermore, in order to reduce the number of wires between the signal checking section 8 and the speed checking section 10, it is desirable to place all ATC commands on one line. Therefore, in order to receive the ATC command whose frequency changes according to the speed limit of each section through a single line as described above, it is necessary to provide the speed checking section with the ability to identify the frequency.

FIG. 3 corrects the shortcomings of FIG. 2 by connecting the signal checking section 8 and the speed checking section 10 with a single line, and inserting a 7-way automatic coupler 16 into this single line. They are coupled together to electrically insulate the two. In such a configuration, the outputs of the filter section 13 are collected by wired OR, and the outputs of the filter section 13 are collected by wired OR, and
The ATC command is transmitted to the speed checking section 10 through the third
The group of electromagnetic relays shown in the figure have been removed. Now, the conventional filter section 13 uses an analog active filter with a fixed pass frequency for each ATC channel.

Since this active filter has a large mounting size and consumes a large amount of power, this part also becomes a factor that hinders miniaturization of automatic train control devices.

Promising methods for reducing the size of the filter section 13 include using a variable center frequency filter that uses a single filter element, such as a switched capacitor filter, but whose center frequency can be changed by an external control signal; ,
J) There is a method of continuously scanning the ATC frequency band using a heterodyne circuit that mixes the output and input of a variable local oscillator to obtain a constant frequency output. Furthermore, unlike the above method, the method of stopping the scan at a channel that has an output above a certain level will fail out (a function that controls in a dangerous direction) if the scan fails to restart when the A10 frequency changes. The scan must be continuous.

FIG. 4 is a circuit diagram illustrating the operation of the receiving section of the above-mentioned method of continuously scanning all channels of ATC under equal constraints. That is, this circuit includes a multilayer filter group 17
The output of the photocoupler 16 is outputted to the photocoupler 16 via a rotary switch 18 that rotates and scans continuously. The output of the signal checking section 8 shown in FIG. 4 becomes an intermittent frequency signal that is output only when the switch 18 is turned to the channel where the ATC signal is actually received, as shown in FIG. . Therefore Photo Cub 21
6, an intermittent frequency signal as shown in the lower part of FIG. 5 is outputted to the speed checking section 10. Therefore, the speed checking unit 10 must be configured to process the intermittent ATC signals sent from the photocube 216 using semiconductor elements, and the development of the speed checking unit 10 with such a configuration is required. must be done.

SUMMARY OF THE INVENTION An object of the present invention is to provide an automatic train control device that is small in size and consumes little power, and is equipped with a semiconductor speed checking section.

The present invention provides an automatic train control device configured to intermittently output a signal checking section A'ff1 ATC signal to a speed checking section at the next stage, in which the speed checking section detects when the ATC signal is continuing at a magnitude greater than a predetermined level. This is detected by another path, and when the ATC signal from the signal check section becomes a no-signal state based on this detection signal, the speed check section itself generates a signal with a frequency substantially equal to the ATC signal to check the speed. The above object is achieved by providing, in addition to the input side of the illuminating section, a semiconductor-based one-time checking section that has a function of not creating a no-signal state due to interruptions in the ATC signal input from the signal checking section.

Embodiments of the present invention will be described below with reference to the drawings, using the same reference numerals for the same parts as those of the conventional example.

FIG. 6 is a schematic diagram showing the configuration of a signal checking section and a speed checking section, which are essential parts of an embodiment of the present invention and an automatic train control device. The output of the a-tary switch 18 in the signal checking section 8 is input to a photocoupler 16 and also to a level detector 19. The output of the photocoupler 16 is input to one input terminal of a frequency adder 20, and the output of the gate 21 is input to the other input terminal of the frequency adder 20. The output of the frequency adder 20 is input to a signal repetition check circuit 22. The output of the memory 23 is input to this signal repetition check circuit 22, and the output of the signal repetition check circuit 22 is input to the speed limit signal generation circuit 24.
is input to the interpolation signal generation circuit 25. The output of this interpolation signal generation circuit 25 is input to the gate 21, and the output of the level detector 19 is also input to this gate 21. The output of the speed limit signal generation circuit 24 is input to a speed comparison circuit 26, and the output of the linear velocity generator 11 is input to this speed comparison circuit 2i.

Next, the operation of this embodiment will be explained. A pattern corresponding to each step of the frequency of the ATC signal is always applied from the memory 23 to the signal repetition checking circuit 22, and the input from the frequency adder 20 is checked. When the ATC signal is input from the photocoupler 16, the signal repetition checking circuit 22 detects a frequency stage that matches this and instructs the speed limit signal generation circuit 24 to generate a speed reference signal, and also outputs an interpolation signal generation circuit 25. Instructs generation of an interpolation signal having substantially the same frequency as the frequency of the ATC signal input to the input signal. Here, the level detector 19
checks the ATC signal strength from a filter section (not shown), closes the gate 21 if it is greater than a predetermined value, and opens the gate 21 when the signal disappears.

FIG. 7 shows the operating waveform diagram of each circuit of the above embodiment, and the output of the frequency adder 2o is the sum of the output of the photocoupler 16 and the output of the goo coupler 21. The resulting ATC signal will be output. In addition, code 1
Reference numeral 9 indicates a detection signal of the level detector, and reference numeral 25 indicates an output signal of the interpolation signal generation circuit 25.

According to the present embodiment, the interpolation signal generation circuit 25 in the speed verification section 10 generates a signal υ to be interpolated into the non-signal portion of the intermittent ATC signal inputted from the photocoupler 16, and gates this signal. Since it has the function of obtaining a continuous ATC signal by returning the signal to the frequency adder 20 via the signal checker 8 and the speed checker 10 through a single line and using the photocoupler 16, Since the speed checking unit 10 has the effect of smoothly processing the ATC intermittent signal that occurs when an insulated connection is made, the electromagnetic relay and analog active filter are omitted and the signal checking unit 8 and speed checking unit 10 are used.
Also, there is an effect that all the joints between the two can be made into semiconductors. Therefore, there is an effect that the entire device can be made smaller and power saving can be achieved. Specifically, the number of connection lines between the signal verification unit 8 and the speed verification unit 10 of this embodiment is one-fifth or less of that of the conventional device, and the number of electromagnetic relays is one-half or less. In addition, the dimensions and weight of the entire device, including the effect of eliminating the power supply, relay drive amplifier, etc., are reduced by 4 times compared to the conventional device.

FIG. 8 is a block diagram showing the main parts of another embodiment of the present invention. This embodiment is also substantially the same as the previous embodiment, but the difference is that a timer 27 is installed in the speed checking section 10, the output of the level detector 19 is input to this timer 27, and the output of the timer 27 is The signal is input to the interpolation signal generation circuit 25.

The timer 27 is started at the falling edge of the output of the level detector 19, and has a function of resetting the interpolation signal generation circuit 25 when a predetermined time has elapsed.

In the previous embodiment shown in FIG. 6, even when a train enters an unsignaled section from a signaled section, the previous speed limit is maintained by the interpolated signal generated within the automatic train control. It will end up being put away. However, in the embodiment shown in FIG. Therefore, even when a train enters a no-signal section, there is no problem like the embodiment shown in FIG. 6, and the train is particularly effective in running more safely.

Note that the functions of the rotary switch 18 are shown with equal restrictions; in reality, a non-contact circuit using a semiconductor element or the like and having the same function as a four-crisp switch can be used.

As described above, according to the present invention, it is possible to provide an automatic train control device that is small in size and consumes little power, and is equipped with a semiconductor speed checking section.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing a schematic configuration of a conventional automatic train control device, Fig. 2 is a schematic block diagram showing an example of a connection structure between a conventional signal checking section and a speed checking section, and Figs. 3 and 4. The figure is a block diagram showing a configuration example when the signal checking section and the speed checking section are connected using a 7-way automatic coupler, Figure 5 is a diagram showing the output ATC signal of the rotary switch in Figure 4, and Figure 6 is a diagram showing the output ATC signal of the rotary switch in Figure 4.
The figure is a block diagram showing the main parts of one embodiment of the automatic train control device of the present invention, FIG. 7 is a diagram explaining the operation of the block diagram shown in FIG. 6, and FIG. 8 is another embodiment of the present invention. FIG. 2 is a block diagram showing main parts of an example. DESCRIPTION OF SYMBOLS 1... Vehicle body, 3... Rail, 4... ATC transmitter, 6... Electronic receiver, 8... Signal checking part, 10... Speed checking part, 11... Speed generator , 12... Brake device, 18... Rotary switch, 19... Level detector, 20... Frequency adder, 21... Gate,
22...Signal repetition verification circuit, 24...Speed limit signal generation circuit, 25...Supporting 1st eye 29th v3 4th eyeliner S concave 6th eye 17th eye 2θ 8th eye

Claims (1)

[Claims] 1. Receive the ATC signal from the running rail, identify the modulation frequency of the ATC signal in the signal checking section, and intermittent the ATC signal after being classified by the signal checking section to the next stage. This speed checking section generates a speed limit frequency based on the input ATC signal, and compares this speed limit frequency with the output of the speed generator to determine whether the vehicle speed exceeds the speed limit. In an automatic train control device that outputs a brake command to the brake device when the speed exceeds the speed limit, and releases the brake command when the speed falls below the speed limit and causes the train to run at or below the speed limit, the frequency is the same as the ATC signal input to the speed checking section. A circuit that generates a signal, and an intermittent ATC that is input by returning the internally generated signal to the input side of the speed checking section.
1. An office train control device comprising a circuit that interpolates a non-signal portion of a signal to generate a continuous ATC signal. 2. A timer that limits the signal generation time of a circuit that generates a signal with the same frequency as the input ATC signal,
The automatic train control device according to claim 1, wherein the automatic train control device is provided in the speed checking section.