JPH04372461A - Axle detecting device - Google Patents

Abstract

PURPOSE:To provide an axle detecting device which does not require to arrange an axle detecting element in proximity and surely detect an axle even under high speed operation. CONSTITUTION:An axle detecting part has at least three axle detecting elements 11-13 installed along a rail 4. The axle detecting elements 11-13 are installed within the shorter distance than the min. between-axle distance L3 of a transfer body 3, keeping intervals. The axle detecting elements 11-13 supply the axle detection signals 111, 121, 131 into a signal processing part 2. In the signal processing part 2, the passing of the axle 31 is judged on the basis of the axle detection signals 111, 121, and 131 which are obtained in succession according to the traveling of the transfer body 3.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an axle detection device for detecting the number of axles passing by a moving body.

0002

2. Description of the Related Art A conventional axle detection device employs a system in which two axle detectors are provided in order to detect the traveling direction of a moving body. As a prior art, Japanese Patent Application Laid-Open No. 189266/1997 detects trains using axle detection.

0003

[Problems to be Solved by the Invention] However, as shown in FIG. 2 of Japanese Unexamined Patent Application Publication No. 2-189266, the conventional axle detection device described above temporally overlaps two detection signals to detect three types of detection signals. Since they are used as signals, only half of each detection signal can be used, and there is a problem that axle axle detection becomes impossible when the moving speed of a moving object becomes high. In particular, in high-speed railways, when the train runs at 350 km/h, the axle detection time of the detection signal is 2 to 3 msec.
c, and the sampling period is about 0.5 msec at maximum, so the overlapping method makes it difficult to detect the axle.

[0004] Furthermore, in order to overlap the two detection signals,
The two axle detectors must be placed in close proximity. For this reason, it is not possible to respond to higher speeds by increasing the spacing between the axle detectors.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an axle detection device that solves the above-mentioned conventional problems and can reliably detect axles even at high speeds without requiring axle detectors to be placed close to each other. That's true.

[0006]

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides an axle detection device including an axle detection section and a signal processing section, wherein the axle detection section is provided along a track. at least three axle detectors, the axle detectors are spaced apart and provided within a distance shorter than the minimum inter-axle distance of the moving body, and each of the axle detectors transmits the axle detection signal to the signal processing. The signal processing section is characterized in that the signal processing section determines the passage of the axle based on the axle detection signals sequentially obtained in response to the travel of the moving object.

[0007]

[Operation] The axle detector has at least three axle detectors provided along the track, and the axle detectors are provided at intervals shorter than the minimum inter-axle distance of the moving body. Therefore, only one axle can fit within the arrangement distance of the three axle detectors, but not multiple axles. Therefore, the axle detection signal is not influenced by other axles.

Since the signal processing section determines whether the axle is passing based on the axle detection signals sequentially obtained in response to the travel of the moving object, it is possible to determine the moving direction of the moving object. Therefore, there is no need to duplicate the axle detection signals, and it is possible to increase the arrangement interval of the axle detectors. Therefore, the number of axles that have passed can be detected reliably even at high speeds.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram schematically showing the structure of an axle detection device according to the present invention. In the figure, 11 to 13 are axle detectors, 2 is a signal processing section, 3 is a moving body, and 4 is a track. The moving body 3 has a forward direction in the direction of arrow a and a backward direction in the direction of arrow b.

The axle detector has at least three axle detectors 11 to 13 provided along the track 4. The axle detectors 11 to 13 are provided at an interval L1 within an arrangement distance L2 that is shorter than the minimum inter-axle distance L3 of the moving body 3. Each of the axle detectors 11 to 13 supplies axle detection signals 111, 121, and 131 to the signal processing section 2. Therefore, the arrangement distance L of the three axle detectors is
2, only one axle can fit in it, but not more than one axle. Therefore, the axle detection signals 111, 121
, 131 are not affected by other axles. The axle detectors 11 to 13 are electromagnetic types that have transmitting coils and receiving coils arranged with the track 4 in between to detect the wheels of the moving body 3, and electromagnetic ones that have light emitters and light receivers arranged to detect the wheels of the moving body 3. It is possible to use an optical type of detection.

The signal processing unit 2 determines whether the axle 31 is passing based on axle detection signals 111, 121, and 131 sequentially obtained as the moving body 3 travels. The determination result is output as an axle detection output 21. Axle detection signal 111, 121
, 131 is taken in at a sampling period of 0.5 msec.
It is set to about. The signal processing section 2 is constituted by a microcomputer, and can be configured to obtain the axle detection output 21 based on its logical judgment.

As described above, the signal processing unit 2 processes the axle detection signals 111 and 12 sequentially obtained in response to the movement of the moving object 3.
1 and 131, the direction of movement of the moving body 3 can be determined. Therefore, there is no need to duplicate the axle detection signals, and the axle detection signals 11 to 13
The spacing between the two can be increased, making it possible to reliably detect axles even at high speeds.

FIG. 2 is a mode transition diagram showing the operation of the signal processing section, and FIG. 3 is a diagram showing the detection signal waveform of the axle detector during forward movement. In the figure, the same reference numerals as in FIG. 1 indicate the same components. In FIG. 2, MC is a mode counter that indicates the state of axle detection, and JC is an axle number counter that counts the number of axles that have passed. In FIG. 3, the state “1
” corresponds to an axle non-detection state, and state “0” corresponds to an axle detection state. When the moving body 3 travels at 350 km/h, the detection time of state "0" is 2 to 3 msec.

The operation of the signal processing section when the moving body 3 moves forward will be explained with reference to FIGS. 2 and 3. Mode m1 indicates a region where the axle detector 11 is in the axle detection state and the axle detectors 12 and 13 are in the axle non-detection state. Similarly, mode m2 indicates a region where the axle detector 12 is in the axle detection state and the axle detectors 11 and 13 are not detecting the axle 31. Mode m3 indicates a region where the axle detector 13 is in the axle detection state and the axle detectors 11 and 12 are in the axle non-detection state.

At time t1 when the axle 31 enters the detection area of the axle detector 11 and the mode m1 is established, the contents of the mode counter MC and the number of axles counter JC are initialized to (0). The axle 31 enters the detection area of the axle detector 12,
At time t3 when mode m1 transitions to mode m2, the mode
(1) is added to the contents of counter MC. Axle 31
Similarly, at time t5 when the vehicle enters the detection area of the axle detector 13 and changes from mode m2 to mode m3, (1) is added to the content of the mode counter MC. If the content of the mode counter MC after the addition is (2), it means that the detection of the axle 31 including the traveling direction has been performed normally, and (1) is added to the content of the axle number counter JC. , clears the contents of the mode counter MC to (0), and prepares to count the following axles. At time t7 when mode m3 is changed to mode m1, the following axle enters from the same direction, so the contents of mode counter MC are not changed. By performing the above-mentioned operations for each axle 31, the number of axles that have passed during forward movement can be reliably counted.

FIG. 4 is a diagram showing a detection signal waveform of the axle detector during regression. In the figure, the same reference numerals as in FIG. 3 indicate the same components.

The operation of the signal processing section when the moving object 3 is regressing will be explained with reference to FIGS. 2 and 4. At time t7 when the axle 31 enters the detection area of the axle detector 13 and mode m3 is established, the mode counter MC and the number of axles counter JC
The content is initialized to (0). The axle 31 enters the detection area of the axle detector 12, and the mode changes from mode m3 to mode m2.
At time t9 when the transition to ■ is made, the contents of the mode counter MC are changed to (
-1) is added. Similarly, at time t11 when the axle 31 enters the detection area of the axle detector 11 and the mode changes from mode m2 to mode m1, the content of the mode counter MC changes to (-1
) is added. If the content of the mode counter MC after addition is (-2), it means that the detection of the axle 31 including the direction of travel was performed normally, and (-1) is added to the content of the axle number counter JC. At the same time, the content of the mode counter MC is cleared to (0) to prepare for counting of the following axle. At time t13 when mode m1 transitions to mode m3, the following axle 31 enters from the same direction, so
Do not change the contents of mode counter MC. By performing the above-mentioned operations for each axle 31, the number of axles that have passed during regression can be reliably counted.

As described above, the concept of state transition is introduced in which the state transitions when the front axle detector detects the axle and the rear axle detector no longer detects the axle. This allows the movement of the axle to be tracked reliably and the axle to be detected accurately.

FIG. 5 is a diagram showing the detection signal waveforms of the axle detectors 11 to 13 when the axle 31 moves forward to just above the detection area of the axle detector 13 and then retreats. In the figure, the same reference numerals as in FIGS. 3 and 4 indicate the same components.

The case of forward movement is the same as that shown in FIG. Therefore,
At time t6 when regression begins, the content of the mode counter MC is (0) and the content of the axis number counter JC is (1). The case of regression is the same as in FIG. Therefore, at time t11 when the mode is m1, the content of the mode counter MC is (-2), and the content of the axis number counter JC is (-1).
) is added to become (0). The contents of mode counter MC are also cleared to (0). The axle 31 is the axle detector 11
At time t12 when the detection area of 1 is regressed, the contents of the mode counter MC and the number of axes counter JC remain at (0). From now on, the axle detector 12 or 13 will be in the state "0".
The mode m1 is maintained until t13 when the detection signal of is generated, and the contents of the mode counter MC and axis number counter JC are (
0) remains. This makes it possible to detect the number of axles without making a mistake in counting.

[0021]

[Effects of the Invention] As described above, according to the present invention, the following effects can be obtained. (a) The axle detector has at least three axle detectors provided along the track, each of the axle detectors supplies an axle detection signal to the signal processor, and the signal processor is configured to: Since the passage of an axle is determined based on axle detection signals obtained sequentially in response to the movement of a moving object, there is no need to place axle detectors in close proximity, and the axle detection device can reliably detect axles even at high speeds. can be provided. (b) Since the three axle detectors are spaced apart and provided within a distance shorter than the minimum inter-axle distance of the moving body, it is possible to provide an axle detection device that is not affected by other axles.

[Brief explanation of drawings]

FIG. 1 is a diagram schematically showing the configuration of an axle detection device according to the present invention.

FIG. 2 is a mode transition diagram showing the operation of a signal processing section.

FIG. 3 is a diagram showing a detection signal waveform of an axle detector during forward movement.

FIG. 4 is a diagram showing a detection signal waveform of an axle detector during regression.

FIG. 5 is a diagram showing a detection signal waveform of an axle detector when the axle advances halfway through the detection area and then retreats.

[Explanation of symbols]

11-13 Axle detector 111 Axle detection signal 121 Axle detection signal 131 Axle detection signal 2 Signal processing section 21 Axle detection output 3. Mobile object 31 Axle 4 Orbit L3 Minimum distance between axles

Claims (1)

[Claims] 1. An axle detection device including an axle detection section and a signal processing section, wherein the axle detection section has at least three axle detectors provided along a track, and the axle detector includes at least three axle detectors provided along a track. are provided at intervals within a distance shorter than the minimum inter-axle distance of the moving body, each of the axle detectors supplies an axle detection signal to the signal processing unit, and the signal processing unit An axle detection device characterized in that the passage of an axle is determined based on the axle detection signals sequentially obtained as the vehicle travels.