Accurate train speed measurement system

Abstract

The utility model discloses an accurate train speed measurement system which comprises a high-speed detection sensor group and a low-speed detection sensor group. When the train speed is smaller than the speed threshold value, the train speed is detected through the low-speed detection sensor set; and when the train speed is larger than or equal to the speed threshold value, the train speed is detected through the high-speed detection sensor set. According to the accurate train speed measurement system with the structure, different speed detection sensor groups are selected in different speed intervals to detect the train speed according to different characteristics of the sensors, so that the detection requirement is met. The speed adaptation range is wide (0-120 km / h), and the vehicle is suitable for the conditions of two directions, high speed, low speed, parking, reversing, vehicle creeping and the like.

Description

TECHNICAL FIELD

[0001] The utility model belongs to train detection technical field, especially relate to a train precision speed measurement system. BACKGROUND

[0002] Intelligent operation and maintenance has become an important direction of railway development. Intelligent detection is a key link to realize intelligent operation and maintenance of railway, which can provide tool means and data support for safe operation, efficient use and rapid repair of train. As a key component to ensure safe operation of train, the train body, for a long time, the detection of key components of train body of railway department in China adopts manual interpretation or parking detection, which has problems such as low efficiency, high cost and safety hazards. At the same time, the existing train body detection system cannot detect the top of the train body, cannot effectively adapt to the application scenarios such as low speed, variable speed and frequent start / stop, and cannot meet the daily detection requirements of low-speed in / out of the warehouse section.

[0003] The existing single sensor either has large error due to high internal delay when detecting at high speed, or the signal is unstable when detecting at low speed, which cannot meet the effective coverage of the full speed range. UTILITARY MODEL CONTENT

[0004] Therefore, the utility model provides a train precision speed measurement system, which detects different speeds by different sensors to realize effective coverage of the full speed range.

[0005] To solve the above technical problems, the technical scheme of the utility model is to adopt a train precision speed measurement system, which comprises a high-speed detection sensor group and a low-speed detection sensor group. When the train speed is less than a speed threshold, the low-speed detection sensor group is used to detect the train speed. When the train speed is greater than or equal to the speed threshold, the high-speed detection sensor group is used to detect the train speed.

[0006] As an improvement, the high-speed detection sensor group comprises wheel sensors arranged before and after the track. It further comprises a data acquisition box, which calculates the speed of the train according to the distance between the front and rear wheel sensors and the time difference of detecting the same wheel by the front and rear wheel sensors.

[0007] As a further improvement, the rear wheel sensor is located in the detection area of the low-speed detection sensor group, so that the detection areas of the high-speed detection sensor group and the low-speed detection sensor group partially overlap.

[0008] As another further improvement, the high-speed detection sensor group is arranged on two tracks respectively, and the two high-speed detection sensor groups detect the train speed of two directions respectively.

[0009] As an improvement, the distance between the front and rear wheel sensors is greater than the diameter of the wheel.

[0010] As an improvement, the low-speed detection sensor group comprises a sensor array consisting of at least two photoelectric sensors; the photoelectric sensors comprise a transmitting end and a receiving end arranged on both sides of the track; the light beams emitted by the transmitting ends in the sensor array form a light curtain for detecting the speed of the wheel.

[0011] As an improvement, the connecting lines of the transmitting end and the receiving end are perpendicular to the track.

[0012] As an improvement, the photoelectric sensors are uniformly arranged along the front and rear directions of the track.

[0013] As an improvement, the width of the light curtain is greater than the diameter of the wheel.

[0014] As an improvement, the low-speed detection sensor group detects the incoming vehicle and judges the speed range of the incoming vehicle; and further comprising a controller, which selects the high-speed detection sensor group and the low-speed detection sensor group to detect the speed of the incoming vehicle according to the speed range of the incoming vehicle.

[0015] The train precision speed measurement system has the advantages that:

[0016] The train precision speed measurement system with the above structure selects different speed detection sensor groups in different speed intervals according to the different characteristics of the sensors to detect the speed of the train, thereby meeting the detection requirements. The speed adaptation range is wide (0-120km / h), and it is suitable for bidirectional, high-speed, low-speed, parking, reversing, and creeping conditions.

[0017] When used as a trigger mechanism for image acquisition, the image acquisition trigger position is accurate, and the consistency of the position of the component in the image is good.

[0018] In addition, the wheel sensor can be installed on the inner side or the outer side of the steel rail, and the space utilization rate is high. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The utility model discloses a schematic diagram.

[0020] Figure 2 The utility model discloses a work flow diagram. DETAILED DESCRIPTION

[0021] In order to make the skilled in the art better understand the technical scheme of the utility model, the utility model is further explained in detail below in combination with specific implementation manners.

[0022] As Figure 1As shown in the utility model provides a train accurate speed measurement system, including high speed detection sensor group and low speed detection sensor group, when train speed is less than speed threshold value, using low speed detection sensor group to train speed detection, when train speed is greater than or equal to speed threshold value, using high speed detection sensor group to train speed detection.

[0023] Due to the characteristics of sensor, the existing speed sensor cannot realize the effective coverage in the whole speed range. Therefore, in the utility model, different speed detection sensor groups are selected in different speed intervals according to the different characteristics of the sensor to detect the train speed, so as to meet the detection requirements.

[0024] Specifically, high speed detection sensor group and low speed detection sensor group are arranged in the utility model, when the speed of train is greater than or speed threshold value, for example, 3km / h, high speed detection sensor group is selected for detection. When the speed of train is lower than speed threshold value, low speed detection sensor group is selected for detection.

[0025] In addition, the low speed detection sensor group is also used to detect the oncoming train and judge the driving speed range of the oncoming train; further comprising a controller, the controller selects high speed detection sensor group and low speed detection sensor group to detect the driving speed of the oncoming train according to the driving speed range of the oncoming train.

[0026] More specifically, the high speed detection sensor group in the utility model comprises wheel sensors (such as magnetic steel) arranged before and after the track; further comprising a data acquisition box, the data acquisition box calculates the speed of train according to the interval of the front and rear two wheel sensors and the time difference of the front and rear two wheel sensors detecting the same wheel.

[0027] The wheel sensor can sense the wheel when the wheel passes through the detection area, so as to send the signal of detecting the wheel to the data acquisition box. According to the time difference of the signals of the front and rear two wheel sensors detecting the same wheel and the interval of the two wheel sensors, the speed of train can be calculated.

[0028] In addition, in order to facilitate the detection of oncoming trains in two directions, the high speed detection sensor group in the utility model is two groups arranged on two tracks respectively. Figure 1 As shown, wherein the wheel sensor WS01 and WS02 are a group (connected with data acquisition box 2), which is used to detect B direction oncoming train. And the wheel sensor WS03 and WS04 are a group (connected with data acquisition box 3), which is used to detect A direction oncoming train. The wheel sensor can be arranged inside the track, or can be arranged outside the track, which is flexible according to the actual situation.

[0029] The two groups of high-speed detection sensor groups respectively detect the speed of the train coming from two directions. For the two groups of high-speed detection sensor groups, the rear wheel sensor is located in the detection area of the low-speed detection sensor group, so that the detection areas of the high-speed detection sensor group and the low-speed detection sensor group partially overlap. That is, no matter which direction the train comes from, the train will first trigger the wheel sensor located in front of one of the high-speed detection sensor groups, and then enter the detection area of the low-speed detection sensor group.

[0030] The reason for such an arrangement is to improve the accuracy of high-speed detection. The front and rear wheel sensors can be larger than the diameter of the wheel, and the purpose is to increase the distance to improve the detection accuracy. In order not to cover too wide a range of the entire detection area, the detection areas of the high-speed detection sensor group and the low-speed detection sensor group partially overlap.

[0031] Although the wheel sensor has high accuracy when detecting a high-speed running train, when the train speed is too low, parked or reversing, the signal will be weak or unstable, resulting in inaccurate position determination. Therefore, in the utility model, a sensor array composed of at least two photoelectric sensors is selected as a low-speed detection sensor group for low-speed detection of the train. The photoelectric sensor includes a transmitting end and a receiving end arranged on both sides of the track; the light emitted by the transmitting end in the sensor array forms a light curtain for detecting the speed of the wheel.

[0032] After the train travels into the light curtain range, a part of the light in the light curtain is shielded, so that the output electric signal changes to detect the speed. Since the entire light curtain is used to detect the wheel, whether it is parked, reversed or crawling in the detection area, it can be accurately detected.

[0033] Of course, the detection method by the light curtain is easy to be disturbed by other tangible foreign objects, and the internal delay is also high, which is only suitable for low-speed detection.

[0034] More specifically, the connecting line of the transmitting end (connected to the data acquisition box 4) and the receiving end (connected to the data acquisition box 1) is perpendicular to the track, that is, the light is perpendicular to the track axis, which is more convenient for detecting the wheel. In addition, the photoelectric sensors are uniformly arranged along the front and rear directions of the track, and the width of the light curtain formed is greater than the diameter of the wheel. Of course, the existing light curtain sensor (its principle is consistent with the photoelectric sensor array) can also be selected.

[0035] As shown in Figure 2 When working, the low-speed detection sensor group is used to determine whether there is a train coming, and to determine the direction and speed range of the train, that is, whether it is greater than the speed threshold of 3km / h.

[0036] If the speed of the incoming vehicle is greater than the set speed threshold, the high-speed detection sensor group is selected to detect the speed, otherwise the low-speed detection sensor group is selected.

[0037] In the case of selecting the low-speed detection sensor group, it is determined whether the photoelectric sensor state is radially symmetrical, and if so, an effective trigger signal is output. Otherwise, a timeout determination process is entered.

[0038] In the case of selecting the high-speed detection sensor group, a sensor signal source is selected, and an effective signal determination process is entered.

[0039] The system can be applied to other detections, such as triggering of train image acquisition, so that the image acquisition triggering position is accurate, and the consistency of the position of the component in the image is good.

[0040] The above is only a preferred embodiment of the present application, and it should be pointed out that the above preferred embodiment should not be regarded as a limitation of the present application, and the protection scope of the present application should be limited by the scope defined in the claims. For ordinary skilled persons in the art, several improvements and refinements can be made without departing from the spirit and scope of the present application, and these improvements and refinements should also be regarded as the protection scope of the present application.

Claims

1. A train precision speed measurement system, characterized in that: It includes a high-speed detection sensor group and a low-speed detection sensor group; when the train speed is less than the speed threshold, the low-speed detection sensor group is used to detect the train speed; when the train speed is greater than or equal to the speed threshold, the high-speed detection sensor group is used to detect the train speed.

2. The train precision speed measurement system according to claim 1, characterized in that: The high-speed detection sensor group includes wheel sensors arranged along the front and rear of the track; it also includes a data acquisition box, which calculates the train speed based on the distance between the front and rear wheel sensors and the time difference between the two wheel sensors detecting the same wheel.

3. The train precision speed measurement system according to claim 2, characterized in that: The wheel sensor located at the rear is within the detection area of ​​the low-speed detection sensor group, causing the detection areas of the high-speed detection sensor group and the low-speed detection sensor group to partially overlap.

4. The train precision speed measurement system according to claim 2, characterized in that: The high-speed detection sensor group consists of two groups arranged on two tracks respectively; the two groups of high-speed detection sensor groups detect the speed of trains coming from two directions respectively.

5. A train precision speed measurement system according to claim 2, characterized in that: The distance between the front and rear wheel sensors is greater than the diameter of the wheel.

6. The train precision speed measurement system according to claim 1, characterized in that: The low-speed detection sensor group includes a sensor array consisting of at least two photoelectric sensors; the photoelectric sensors include a transmitting end and a receiving end respectively disposed on both sides of the track; the light emitted by several transmitting ends in the sensor array forms a light curtain for detecting the speed of the wheels.

7. A train precision speed measurement system according to claim 6, characterized in that: The line connecting the transmitter and receiver is perpendicular to the track.

8. A train precision speed measurement system according to claim 6, characterized in that: Several photoelectric sensors are evenly arranged along the front and back direction of the track.

9. A train precision speed measurement system according to claim 6, characterized in that: The width of the light curtain is greater than the diameter of the wheel.

10. A train precision speed measurement system according to claim 1, characterized in that: The low-speed detection sensor group detects oncoming vehicles and determines their speed range; it also includes a controller, which selects the high-speed detection sensor group and the low-speed detection sensor group to detect the speed of the oncoming vehicle based on the speed range of the oncoming vehicle.

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