JPS6366121B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic train control method that maintains safe running of trains by preventing collisions between trains and strictly observing speed limits based on the topography of the route.

Figure 1 is a characteristic diagram showing the principle of the conventional automatic train control method, where the vertical axis is the train speed and the horizontal axis is the distance in units of track sections (SEC.N) to (SEC.N+2). It shows. Now, the preceding train T
is on the line at section (SEC.N+3), the following trains will have speed limits corresponding to the section due to signals from the ground, and will be V _N , V _N+1 , and V _{N+2 ,} respectively.
...is limited to... Therefore, when a following train exceeds the speed limit, the automatic train control device installed on the train automatically detects the speed limit and applies brakes to the train to keep it below the speed limit.
In the figure, V _V indicates the speed trajectory of the following train. In the conventional device, as shown in Figure 2, when the train speed is high (V ₁ in the diagram), the distance traveled before deceleration is long, but when the train speed is low (V ₂ in the diagram)
The running distance is small, and running efficiency decreases when multiple trains are run on the same route in succession.

Furthermore, the running efficiency is also reduced due to a delay in detecting the speed limit of the automatic control device, variations in the occurrence of on-vehicle patterns due to delays in commands, delays in the application of the brake system, and variations in the applied braking force. That is, as shown in Figure 3, sections (SEC.N10), (SEC.
N20), due to the automatic control device's speed limit detection delay, command delay, etc., the true on-board pattern V _N10 ,
For V _N20 , upper limit value V _N11 , V _N21 , lower limit value V _N12 ,
The pattern on the car will vary within the range of V _N22 .
This variation is allowed to be ±2 Km/h in normal equipment. If the on-board pattern varies in this way, the speed trajectory of the train that is controlled based on it will naturally vary, and the stopping distance of the train will also vary greatly.

Furthermore, even if the brake force applied to the train varies, the speed trajectory of the train will vary in the same way as described above. These variations reduce train running efficiency. This invention solves the above-mentioned problems of conventional devices by keeping the distance-speed trajectory of the train constant and preventing run curve fluctuations based on variations in train performance and detection delays in ground signals. The objective is to provide a control method that can realize efficient train running by eliminating fluctuations in on-board patterns.

An embodiment of the present invention will be described below.

That is, in the present invention, as shown in Fig. 4, the highest speed limit pattern V _P allowed by that section is generated, and trains traveling at less than this speed are determined to exceed the speed limit without applying the brakes. Apply the brakes only when This system allows the train to run efficiently even when the speed of the train is low without applying the brakes unnecessarily.
This is indicated by V _V in the figure.

However, the V _P pattern is generated based on the permissible speed of the previous section and the permissible speed of the next section, but the change in this limit is caused by the speed limit detection delay tde of the onboard automatic control device and the train's actual speed V _V The free running pattern length le differs based on.

le=V _V ×tde tde is a delay in the on-board judgment of signals on the ground and is a value unique to the device, and can be set in advance, but the actual speed of the train, _V Since it is an element that changes, it is an arbitrary variable element. Therefore, le is not always constant.

However, as shown in FIG. 5, for example, the distance S _N
If the maximum speed of a train allowed in a section (SEC.N) with (m) is V _N , then the maximum speed pattern allowed by that section (SEC.N) is
If _the train speed is controlled based on this pattern V _P , the train will stop exactly at a distance S _N (m). In this case, the idle running pattern length ln, which runs idle at maximum speed, is always a constant value in that section (SEC.N), and when the train's distance traveled reaches ln by integrating the actual train speed V _V , By lowering the deceleration pattern, the
A V _P pattern can be generated. (In Fig. 1, the speed pattern in Fig. 5 is shown by a two-dot chain line for comparison with the conventional method.) Therefore, by using the configuration shown in Fig. 6, the actual speed of the train is
Efficient train speed control is possible by eliminating fluctuations in idle running distance based on _VV . In Fig. 6, 1 is a speed generator that detects the speed of the train, and 2 is a waveform shaping circuit that shapes the waveform of the output wave of the speed generator 1 to make it convenient for later calculations. Outputs a pulse wave proportional to the output. 3 is a speed calculation circuit which receives the output of the waveform shaping circuit 2 and also has the function of correcting the speed error based on the light diameter of the train car; 4 is a speed calculation circuit that detects on the train the speed limit signal corresponding to the section flowing on the ground. 5 is a demodulator for receiving the output of the antenna 4 and demodulating the limit signal; 6 is a demodulator for determining the free running distance according to the speed limit, and integrating the speed output of the speed calculation circuit 3 as described above. An empty running distance detector that has a function of detecting when a certain empty running distance ln determined by that section has been reached,
7 is a constant value based on the speed limit signal given from the demodulator 5 and the free running distance signal given from the free running distance detector 6, that is, the speed limit in the previous section and the delay in detecting the limit speed of the automatic control device. The train is run idle at the speed limit of the previous section until the length of the idle running pattern, and when the train travel distance reaches a certain idle running pattern length, a deceleration pattern is created according to the distance to the next section so that the speed reaches the speed limit of the current section. 8 is a distance-velocity pattern generation circuit 7 that generates a distance-velocity pattern V _P that reduces the
The speed limit V _P and the actual speed of the train in speed calculation circuit 3
A comparison circuit 9 for comparing V and _V is an amplifier that amplifies the output of the comparator 8 and drives an output relay 10 for operating a brake device (not shown).

With this circuit configuration, the pattern generation circuit 7 can generate a speed limit pattern V _P according to the section and a constant deceleration pattern even when the actual speed of the train changes. When the speed V _V exceeds the speed limit pattern V _P , an input is given to the relay 10 to apply the brake, and when the speed limit does not exceed the pattern, the brake is released, thereby making it possible to make the train speed follow the pattern.

As described above, the present invention allows efficient train operation by causing the actual speed of the train to follow a pattern that is not affected by speed fluctuations.

[Brief explanation of drawings]

Fig. 1 is a principle diagram showing the operation of a conventional automatic train control device, Fig. 2 is a characteristic diagram showing variations in train trajectory based on the principle of Fig. 1, and Fig. 3 is a diagram of the on-board pattern of an automatic train control device. FIG. 4 is a pattern diagram showing the variation, FIG. 4 is a characteristic diagram showing the action of the present invention, FIG. 5 is a pattern characteristic diagram showing the speed limit pattern according to the present invention, and FIG. 6 is a block diagram showing an embodiment of the present invention. be. Note that the same reference numerals in the figures indicate the same or corresponding parts. In the figure, 1 is a speed generator, 3 is a speed calculation circuit, and 4 is a speed generator.
is an antenna, 5 is a demodulator, 6 is a free running distance detector,
7 is a distance-velocity pattern generation circuit; 8 is a comparator;
9 is an amplifier, and 10 is an output relay.

Claims (1)

[Claims] 1. In an automatic train control system that provides sections at predetermined distances in the direction of train travel and controls trains to prevent collisions with each other and to ensure that speed limits based on terrain and route conditions are not exceeded, on-board equipment is equipped with distance-speed information. A pattern generator is installed on the train to detect when the speed limit signal from the ground changes from higher to lower, compare the actual speed with the speed limit, and control the actual speed below the speed limit. When the train enters a predetermined section, the train runs idle at the speed limit of the previous section until a certain length of the idle running pattern corresponding to the speed limit of the previous section and the speed limit detection delay of the automatic control device, and the distance traveled by the train is reduced. Generating a distance-speed pattern that reduces the deceleration pattern according to the distance to the next section so that the speed reaches the limit speed of the current section when the certain idle running pattern length is reached, and based on the distance-speed pattern of that section. An automatic train control method characterized in that the brakes are applied only when the speed is exceeded.