JP2002211400A - Derailment detecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a derailment detecting device capable of detecting derailment quickly and properly. SOLUTION: This device detects the derailment of a vehicle 10 traveling on a railroad track. In the device, the acceleration applied to the body 10a of the vehicle 10 is detected by the acceleration sensor 3 installed on the body 10a, and a signal in a specific frequency band is extracted from the detected acceleration, and then, the signals in the specific frequency band are integrated continuously every specified time (S20). A derailment of the vehicle 10 is judged based on the fact that the difference between the integrated value IG(i) and the integrated value IG(i-n) before a specified time exceeds a specified value α(S24).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a derailment detecting device for detecting a derailment of a railway vehicle traveling on a track.

[0002]

2. Description of the Related Art Conventionally, detection of derailment of a vehicle in a railway vehicle traveling on a track is performed by a crew member on the vehicle feeling abnormal vibration and performing an emergency stop operation, and then checking the condition of the vehicle. It was done by.

[0003]

However, such a method of detecting derailment of a vehicle has a problem that detection of derailment is delayed in a vehicle, such as an intermediate vehicle, on which no occupant is on board. Also, in order not to hinder the smooth operation of the vehicle,
It is desirable to minimize erroneous detection at the time of non-derailment and to appropriately perform derailment detection.

The present invention has been made to solve such a technical problem, and an object of the present invention is to provide a derailment detection device capable of detecting a derailment quickly and appropriately.

[0005]

That is, a derailment detection device according to the present invention is a device for detecting derailment of a railway vehicle running on a track, and is installed on the vehicle body to detect acceleration applied to the vehicle body. Acceleration detecting means, signal extracting means for extracting a signal in a specific frequency band from an output signal of the acceleration detecting means, integrating means for repeatedly integrating the signal in the specific frequency band at predetermined time intervals, and an integrated value integrated by the integrating means And determining means for determining the derailment of the vehicle based on a difference between the integral value and the integral value before the predetermined time exceeds a predetermined value.

Further, the derailment detecting device according to the present invention includes sampling means for sampling a signal of a specific frequency band extracted by the signal extracting means at regular intervals, and the integrating means described above includes the specific frequency sampled by the sampling means. It is characterized by integrating a band signal.

Further, the derailment detecting device according to the present invention includes sampling means for sampling the output signal of the acceleration detecting means at regular time intervals, and the signal extracting means described above uses the output signal of the acceleration detecting means sampled by the sampling means. It is characterized by extracting a signal of a specific frequency band.

According to these inventions, the derailment determination is performed based on the acceleration generated when the railroad vehicle derails, so that the derailment of the vehicle can be detected quickly. In addition, at this time, by integrating the acceleration signal of the vehicle body and comparing the current integrated value with the previous integrated value, it is possible to relatively detect an increase in the vibration generated in the vehicle body, so that the vehicle speed, the track state, etc. Regardless of the difference, derailment detection of the vehicle can be appropriately performed. For example, when the vehicle speed increases or enters a section where the track condition is poor, the vibration generated in the vehicle increases,
Even in such a case, derailment detection can be appropriately performed.

The derailment detecting device according to the present invention is characterized in that the determining means changes the predetermined value according to the vehicle speed.

According to the present invention, since the reference value for the derailment determination is changed according to the vehicle speed, it is possible to prevent erroneous detection during non-derailment and to reliably detect derailment during derailment. Can be realized.

Further, the derailment detecting device according to the present invention comprises position detecting means for detecting a position on the track of the vehicle, wherein the determining means uses a predetermined value set for each position on the track to detect the position of the vehicle. A derailment determination is performed.

According to the present invention, since the reference value for derailment determination is changed according to the traveling position of the vehicle, more appropriate derailment detection according to the track condition can be performed.

[0013]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In the description of the drawings, the same elements will be denoted by the same reference symbols, without redundant description.

(First Embodiment) FIG. 1 shows a configuration diagram of a derailment detecting device according to the present embodiment. FIG. 2 is an explanatory diagram of the arrangement of components in the derailment detection device according to the present embodiment.

As shown in FIG. 1, the derailment detecting device 1 includes a controller 2 for controlling the entire device. Controller 2
Is mainly composed of a computer including a CPU, a ROM, and a RAM. Various control routines including a derailment detection processing routine are stored in the ROM.

Further, the derailment detecting device 1 is provided with an acceleration sensor 3. The acceleration sensor 3 is an acceleration detecting unit that is installed on the vehicle body 10a (see FIG. 2) of the vehicle 10 and detects acceleration applied to the vehicle body 10a, and outputs an acceleration signal according to the acceleration applied to the vehicle body 10a. By measuring the acceleration of the vehicle body 10a by the acceleration sensor 3,
It is possible to detect the vibration caused by the derailment of the vehicle 10. The acceleration sensor 3 includes at least a vehicle body 10
The one that can detect the vertical acceleration of a is used.

The derailment detecting device 1 is provided with a band pass filter 4. The bandpass filter 4 is connected to the output side of the acceleration sensor 3 and receives an output signal of the acceleration sensor 3. The band-pass filter 4 is a signal extracting unit that extracts a signal of a specific frequency band from an output signal of the acceleration sensor 3, and for example, an analog filter is used. Here, the specific frequency band is, for example, 6 to 20 Hz.

By extracting a component of a specific frequency band from the acceleration signal by the band pass filter 4, noise unnecessary for the derailment determination can be reduced, and the derailment determination can be performed more accurately based on the acceleration caused by the derailment. It becomes possible.

The derailment detecting device 1 is provided with a speed sensor 5. The speed sensor 5 is a speed detecting unit that is installed on the vehicle 10 and detects a traveling speed of the vehicle 10. As the speed sensor 5, for example, a speed generator mounted on the axle of the vehicle 10 and having a frequency that changes according to the vehicle speed is used.

The derailment detecting device 1 is provided with a position detector 6. The position detector 6 is a position detecting unit that is installed on the vehicle 10 and detects a traveling position of the vehicle 10. As the position detector 6, for example, a transponder antenna that receives a signal emitted from the track 20 side is used.

The position detecting means of the vehicle 10 includes:
In addition to the position detector 6, the ATC (Automatic Train)
Control) signal may be used to detect the position.

The controller 2 receives an acceleration signal of a specific frequency output from the band-pass filter 4, a speed signal output from the speed sensor 5, and a vehicle position signal output from the position detector 6. And controller 2
Performs a derailment detection process based on these signals, and outputs the result of the derailment detection process to the vehicle travel control device 11.

The vehicle running control device 11 is a device for controlling the running of the entire vehicle, and includes an emergency stop circuit and the like. When it is determined by the derailment detection process of the derailment detection device 1 that the vehicle is derailed, the emergency stop circuit is activated to stop the vehicle in an emergency. Further, a display unit 12 such as a monitor is connected to the vehicle travel control device 11. This display unit 12
Displays a state such as whether or not the vehicle 10 is derailed according to the result of the derailment detection process of the derailment detection device 1.

As shown in FIG. 2, a derailment detecting device 1 is a vehicle 10 which is a railway vehicle running on rails 20 of a track.
Of the vehicle 10a. The vehicle 10 includes a vehicle body 10
a and a traveling device 10b including a wheel set, a bogie, and the like.

The derailment detecting device 1 has a housing 9.
The controller 2, the acceleration sensor 3, the band pass filter 4 (see FIG. 1) and the like are housed in the housing 9. As described above, it is desirable to install the controller 2, the acceleration sensor 3, the bandpass filter 4, and the like of the derailment detection device 1 on the vehicle body 10a.

For example, when the controller 2, the acceleration sensor 3, the band-pass filter 4 and the like are installed in the traveling device 10b,
Vibration during normal running is severe, which is likely to cause a failure. If the structure can withstand the vibration, the cost of the device will increase. On the other hand, by installing the controller 2, the acceleration sensor 3, the band-pass filter 4, and the like on the vehicle body 10a, it is possible to reduce the occurrence of device failures and to easily take measures against vibration.

The acceleration sensor 3 may be installed outside the housing 9 without being housed in the housing 9. In this case, a plurality of acceleration sensors 3 may be installed on the same vehicle body 10a. Providing a plurality of units enables more reliable derailment detection.

The speed sensor 5 is installed on the axle of the vehicle 10, and the position detector 6 is installed on the bottom of the vehicle 10.

FIG. 3 is an explanatory view of the entire vehicle.

As shown in FIG. 1, a plurality of vehicles 10 travel while being connected. Each vehicle 10 has a derailment detection device 1
It is desirable to install. In this case, the derailment of each vehicle 10 can be detected accurately and quickly. Each derailment detection device 1 is connected to a vehicle travel control device 11 installed in the front and last vehicles 10.

In FIG. 3, the derailment detection device 1 is installed for each vehicle 10, but the derailment detection device according to the present invention is not limited to such a derailment detection device. One or several body parts such as 2 may be installed in the vehicle set, and the acceleration sensor 3 may be installed for each vehicle 10. In this case, the number of controllers 2 and the like can be reduced, and the cost of the derailment detection device 1 can be reduced.

Next, the operation of the derailment detecting device according to this embodiment will be described.

FIG. 4 is a flowchart showing the operation of the derailment detecting device according to the present embodiment. As shown in S10 of the figure, the controller 2 of the derailment detection device 1 is initialized. By this initialization, the data stored in the RAM of the controller 2, for example, the number of derailment determinations JM described later, and the like are reset.

Then, the flow shifts to S12, where a counter for a predetermined time set in the controller 2 in advance, that is, an integration time is started. The integration time is set according to the sampling period of the acceleration signal, and is set to, for example, 1 second. An integral value of the acceleration is repeatedly obtained for each integration time.

Then, the flow shifts to S14, where the acceleration G is read. The reading of the acceleration G is performed based on the acceleration signal of the specific frequency band extracted by the band pass filter 4.

Then, the flow shifts to S16, where the acceleration G is sampled. The sampling of the acceleration G is a process of performing AD conversion (analog-digital conversion) on the acceleration signal at a constant sampling cycle. The sampling cycle is, for example, 10 ms. In this case, 100 acceleration data can be obtained in an integration time of 1 sec.

Then, the flow shifts to S18, where the acceleration G is converted into an absolute value, and the flow shifts to S20, where the acceleration G is integrated. Acceleration signal a which has been converted into an absolute value by integration of acceleration
bsG are sequentially integrated, and the integrated value IG is used as the integrated value.
(I) is calculated.

Then, the flow shifts to S22, where it is determined whether the integration time counter is overtime or not. When it is determined that the counter is not overtime, the process returns to S14. On the other hand, when it is determined that the counter is overtime, the process proceeds to S24.
When this counter is overtime, an integrated value IG (i) of the acceleration signal in a fixed integration time is obtained.

As shown in FIG. 5, the acceleration signal read in S14 is a signal that rises and falls with respect to a certain value according to the vibration of the vehicle body 10a. The acceleration signal is sampled, converted into an absolute value, and integrated during the integration time, whereby an integrated value corresponding to the vehicle vibration can be obtained for each integration time. In FIG. 5, each horizontal axis represents time t.

Then, the flow shifts to S24 in FIG. 4, where the integrated value IG (i) of the current acceleration and the integrated value IG (i-
n) is greater than or equal to a predetermined value α, that is, the integrated value IG (i) of the current acceleration is the integrated value IG (i−n) times before.
It is determined whether or not the value is greater than a value obtained by adding n) to the predetermined value α.

The predetermined value α is a value set by the controller 2, and is set, for example, by analyzing acceleration data of normal running and derailing running.

It is desirable that the predetermined value α be changed according to one or both of the traveling speed and the traveling position of the vehicle 10. By changing the setting of the predetermined value α according to the traveling speed and the traveling position, more accurate derailment detection can be performed.

For example, by setting a predetermined value α which is a threshold value for each vehicle speed in advance from acceleration data of normal traveling and derailment traveling, it is possible to cope with a change in acceleration due to a difference in vehicle speed, and more appropriate derailment detection can be performed. I can do it. In addition, by setting the predetermined value α for each traveling position, more appropriate derailment detection can be performed even in a section where the vibration is large due to the influence of a track deviation or the like.

At S24, the integrated value IG of the current acceleration is obtained.
When it is determined that (i) is not larger than the value obtained by adding the integral value IG (in) obtained n times and the predetermined value α, S28
Move to On the other hand, in S24, the integrated value IG (i) of the current acceleration is set equal to the integrated value IG (i-n) obtained n times earlier by the predetermined value α.
Is determined to be larger than the value obtained by adding
And the derailment count value JM is incremented by one.

Then, the flow shifts to S28, where 1 is added to the count value n of the integral data. Then, the process proceeds to S30,
It is determined whether or not the count value n is a predetermined value A.
A is an integer value set by the controller 2 and is set in consideration of detection accuracy, detection speed, and the like.
Is set.

As shown in FIG. 6, when A is set to 3, the current integrated value (the integrated value 0.00 to 0.99 seconds ago) and the integrated value 1 to 3 times earlier (1. Integrated value before 00 to 1.99 seconds, integrated value before 2.00 to 2.99 seconds, 3.00 to 1.99 seconds
(The integrated value before 3.99 seconds), and the derailment is detected based on the comparison result.

The value A is desirably changed in accordance with one or both of the traveling speed and the traveling position of the vehicle 10, similarly to the above-mentioned predetermined value α. By changing the value A according to the traveling speed and the traveling position, appropriate derailment detection can be performed.

When it is determined in S30 that the count value n is not the predetermined value A, the flow returns to S24. On the other hand, S30
When it is determined that the count value n is the predetermined value A, a predetermined derailment count value JM is obtained, and the flow shifts to S32.

In S32, it is determined whether or not the derailment count value JM is greater than a predetermined number JM _default . The set value JM _default is a value preset in the controller 2, and is set by analyzing acceleration data of normal traveling and derailment traveling.

For example, the set value JM _default is set to a value of about half of A. Specifically, when A is 1, the set value JM _default is set to 1. When A is 2, the set value JM _default is set to 1 or 2. If A is 3, the set value JM
_default is set to 2.

It is desirable that the setting value JM _default be changed according to one or both of the traveling speed and the traveling position of the vehicle 10. By changing the set value JM _default according to the traveling speed and the traveling position, more accurate derailment detection becomes possible.

For example, by setting the set value JM _{de fault} in advance for each vehicle speed from the acceleration data of normal traveling and derailing traveling, it is possible to cope with the fluctuation of the acceleration due to the difference in the vehicle speed and to detect the proper derailment. In addition, by setting the set value JM _default for each traveling position, an appropriate derailment can be detected even in a section where vibration is large due to the influence of a track deviation or the like.

At S32, the derailment count value JM
When but that is not greater than the set value JM _{defaul t} is a predetermined number of times, the process proceeds to S34, it is determined that the vehicle 10 is traveling normally, the normal traveling from derailing detector 1 in the vehicle running control system 11 Is output. In addition, the display unit 12 displays a display of normal running.

On the other hand, if it is determined in S32 that the derailment count value JM is larger than the predetermined number JM _default , the flow shifts to S36, where it is determined that the vehicle 10 is traveling in derailment, and the derailment detecting device is detected. 1 outputs a signal notifying derailment to the vehicle travel control device 11. The display unit 12 displays a derailment.

Then, when a signal indicating the derailment is input to the vehicle travel control device 11, an emergency stop is automatically performed. In this case, the occupant of the vehicle 10 may manually perform an emergency stop measure while watching the derailment display.

As described above, according to the derailment detecting device according to the present embodiment, the derailment is determined based on the acceleration generated when the vehicle 10 derails, so that the derailment of the vehicle 10 can be detected quickly.

At this time, by integrating the acceleration signal of the vehicle body 10a and comparing the current integrated value with the previous integrated value, it is possible to relatively detect an increase in the vibration generated in the vehicle body 10a. Derailment detection of the vehicle 10 can be appropriately performed irrespective of a difference between the vehicle and the track state. For example, when the vehicle speed increases and the vehicle enters a section where the track condition is poor, the vibration generated in the vehicle 10 increases. Even in such a case, appropriate derailment detection can be performed.

Further, by changing the predetermined value α for determining derailment or the predetermined number of times JM _default in accordance with the vehicle speed, it is possible to prevent erroneous detection during non-derailment and to reliably detect derailment during derailment. Derailment detection can be realized.

Further, by changing the predetermined value α for the derailment determination or the predetermined number of times JM _default according to the traveling position, more appropriate derailment detection according to the track condition can be performed.

In this embodiment, the case where the integrated value of the current acceleration is compared with the integrated value of the past acceleration n times before and the derailment determination is performed based on the comparison result has been described. May be compared between the integrated values of the past accelerations. For example, the derailment determination may be performed based on the comparison result of comparing the integrated value one time before and the integrated value two to four times before. Even in this case, the same operation and effect as those of the derailment detection device 1 described above can be obtained.

(Second Embodiment) Next, a derailment detection device according to a second embodiment will be described.

In the derailment detection device according to the first embodiment, a signal of a specific frequency band is extracted from the acceleration signal of the acceleration sensor 3 by the band-pass filter 4, and then AD conversion as sampling processing is performed. However, the derailment detection device according to the present invention is not limited to such a device, and may perform signal conversion in a specific frequency band after AD conversion (sampling processing) of the acceleration signal of the acceleration sensor 3. In this case, an AD converter and a digital filter may be provided instead of the bandpass filter 4. A discrete value of the acceleration signal is obtained by the AD converter, and a signal of a specific frequency band is extracted from the discrete value.

Even with such a derailment detecting device, the same operation and effect as those of the derailment detecting device according to the first embodiment can be obtained.

[0064]

As described above, according to the present invention, the derailment is determined based on the acceleration generated when the railway vehicle derails, so that the derailment of the vehicle can be detected quickly.

At this time, by integrating the acceleration signal of the vehicle body and comparing the current integrated value with the previous integrated value, it is possible to relatively detect an increase in vibration occurring in the vehicle. Derailment detection of a vehicle can be appropriately performed regardless of a difference in a state or the like. For example, when the vehicle speed increases and the vehicle enters a section where the track condition is poor, the vibration generated in the vehicle increases. Even in such a case, appropriate derailment detection can be performed.

By changing the reference value for derailment determination according to the vehicle speed, it is possible to prevent erroneous detection during non-derailment and to reliably detect derailment during derailment.
More appropriate derailment detection can be realized.

Further, by changing the reference value of the derailment determination according to the traveling position of the vehicle, more appropriate derailment detection can be performed according to the track condition.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a derailment detection device according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of the derailment detection device of FIG.

FIG. 3 is an explanatory diagram of the derailment detection device in FIG. 1;

FIG. 4 is a flowchart showing an operation of the derailment detection device of FIG.

FIG. 5 is an explanatory diagram of an acceleration signal and the like in the derailment detection device of FIG. 1;

FIG. 6 is an explanatory diagram of a derailment detection process in the derailment detection device of FIG. 1;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Derailment detection apparatus, 2 ... Controller, 3 ... Acceleration sensor (acceleration detection means), 4 ... Bandpass filter (Signal extraction means), 5 ... Speed sensor, 6 ... Position detector (Position detection means), 10 ... Vehicle, 10a: vehicle body, 20: rail.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Yayoi Misu 2-2-2 Yoyogi Shibuya-ku, Tokyo East Japan Railway Company (72) Inventor Fumio Eguchi 3-1 Okawa, Kanazawa-ku, Yokohama-shi, Kanagawa No. Tokyu Vehicle Manufacturing Co., Ltd. (72) Masahiro Ohno 3-1 Okawa, Kanazawa-ku, Yokohama, Kanagawa Prefecture Inside Tokyu Vehicle Manufacturing Co., Ltd. Tokyu Vehicle Manufacturing Co., Ltd. (72) Kenichi Hirabayashi 3-1 Okawa, Kanazawa-ku, Yokohama-shi, Kanagawa Prefecture Tokyu Vehicle Manufacturing Co., Ltd. (72) Naoki Kawata 3-1 Okawa, Kanazawa-ku, Yokohama-shi, Kanagawa Tokyu Vehicle Manufacturing Co., Ltd.

Claims (5)

[Claims] 1. An apparatus for detecting derailment of a railway vehicle traveling on a track, comprising: acceleration detection means installed on a vehicle body of the vehicle to detect acceleration applied to the vehicle body; and an output signal of the acceleration detection means. Signal extracting means for extracting a signal of a specific frequency band from the signal processing means, integrating means for repeatedly integrating the signal of the specific frequency band at predetermined time intervals, an integrated value integrated by the integrating means and an integrated value before the predetermined time. Determining means for determining a derailment of the vehicle based on that the difference of the vehicle exceeds a predetermined value. 2. The apparatus according to claim 1, further comprising: sampling means for sampling the signal of the specific frequency band extracted by the signal extracting means at regular intervals, wherein the integrating means integrates the signal of the specific frequency band sampled by the sampling means. The derailment detection device according to claim 1, wherein 3. A signal in a specific frequency band based on an output signal of the acceleration detecting means sampled by the sampling means, wherein the signal extracting means comprises a sampling means for sampling an output signal of the acceleration detecting means at regular intervals. The derailment detection device according to claim 1, wherein 4. The apparatus according to claim 1, wherein said determining means changes said predetermined value according to a vehicle speed of said vehicle.
3. The derailment detection device according to any one of 3. 5. A position detecting means for detecting a position of the vehicle on the track, wherein the determining means determines a derailment of the vehicle using the predetermined value set for each position on the track. The derailment detection device according to any one of claims 1 to 4, wherein the detection is performed.