JPH0251016A - Method for measuring position of train - Google Patents

Abstract

PURPOSE:To enhance the reliability in the measurement of a distance and to establish a highly safe train control system by measuring the distances from the respective measuring points before and behind a train to be measured to said train and checking that the sum of both measured values becomes constant. CONSTITUTION:Measuring points of the position of a train are set to (a)-(c) and position measuring signals are allowed to flow to a rail from the respective points to calculate the shortcircuit impedance of the wheel of the train and the distances L1-L4 up to the train are measured. The distance L between trains is calculated from L2+L3. The distance L2 can be checked to be correct from the relation of L1+L2 = constant by measuring the distance L1. In the case of checking on the ground side, the measured distance L3 and the distance LT between the measuring points (b)-(c) are transmitted to a vehicle from the ground and the distance L5 integrated after the passage of the point (c) is used on the vehicle and the distance L3 can be checked to be correct based on whether the relation of L3+L5=LT holds. Therefore, the distance data L=L2+L3 up to a preceding train B sent to a succeeding train A becomes certain checked data.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method for measuring the position of a train on a railway.

[Prior Art] When performing train spacing control, the position of the train must be reliably measured because an error may lead to a serious accident.

Conventionally, this train position measurement.

(1) A method of measuring distance by using the fact that the current, voltage, or impedance of the signal flowing through the rails changes depending on the short circuit position between the eight train axles. (2) A method of measuring the distance by installing several dozen cross-guide lines between the rails. A method is used that uses guide lines that intersect every meter to count two pulses.

[Problems to be Solved by the Invention] These train position measurements do not check whether the measured distance is correct.

Therefore, even if the position measurement was incorrect, there was a possibility that the train could be controlled incorrectly based on the result.

[Means for Solving the Problem] In order to solve the above problems, a train position measurement method is provided in which the train position measured on the ground is constantly checked on the ground or on the train, and the reliability of distance measurement is improved. I will provide a.

Specifically, (1) as shown in Figure 1, measure the distance L1 from the front point A of train A to the leading position of the train, and at the same time measure the distance L2 from the rear point A to the tail end of train A. , when train A is between fixed points A and A on both sides, the sum (L1+L2) of each measured distance is constant.

Check that both measurements are done correctly.

(2) As shown in Figure 2, the distance between measurement sections A to A is LT.
The distance L1 from the point A in front of one train A to the head position of the train A is measured in the section , and the measurement result and the measured section length LT are transmitted onboard. The vehicle detects when it enters the measurement zone and adds up the distance L2 traveled from that moment. It is checked whether distance measurement is performed correctly by checking whether the relationship L1+L2=LT holds.

[Operations] Using the present invention, extremely reliable train position measurement becomes possible, and a highly safe train spacing control system based on this position measurement method can be realized.

[Example] As shown in Figure 3, in order to ensure safety, train A is equipped with zero train position measurement points, which are necessary to determine the distance to the rear of preceding train B. 9 For example, a.

B. Send a signal for position measurement to the rail.

Find the short-circuit impedance of the train's wheels, then calculate the distances to the train Ll, L2. L3. The zero inter-train distance that is used to measure L4 is determined by the sum of L2 and L3.

By measuring Ll, it can be checked that the distance gltL2 is correct from the relationship L1+L2=constant.

As for L3.

(1) When checking on the ground side, by measuring L4, it is possible to check that it is correct because L3 + L4 = constant relationship.

(2) When checking on the vehicle, transmit the measured distance L3 and the distance 11i1LT measured from the ground to the vehicle, use the distance L5 accumulated after passing the distance on the vehicle, and
The correctness is determined by whether the relationship 3+L5=LT holds true.

Therefore, pressure section information L up to the preceding train sent to the following train =
L2+L3 becomes checked and reliable information.

[Effects of the Invention] Using this method, it becomes possible to measure train positions with extremely high safety, and it becomes easy to construct train control systems such as moving blockages.

[Brief explanation of the drawing]

Figure 1 shows how to check the measurement results by measuring both the leading and trailing positions of the train. Figure 2 shows how to measure the leading position of the train and check the results onboard the train. Figure 3 shows a method of measuring while checking the distance between trains.

Claims (2)

[Claims] (1) When measuring the position of a train, measure the distance from both the front and rear points of the target train, and the sum of the measured distance from the front and the distance measured from the rear is constant. A train position measuring method characterized by increasing the reliability of distance measurement by checking that (2) When measuring the position of a train, measure the distance from the front of the train to be measured to the train, transmit the results and the length of the measurement section to the onboard vehicle, and detect when the train has entered the measurement section. Then, the reliability of distance measurement is increased by adding up the distance traveled in the measurement section from that time and checking that the sum of the measurement distance transmitted from the ground and the distance accumulated on the vehicle becomes the measurement section length. A train position measurement method characterized by: