A dual-path locomotive signal receiving antenna with four induction coils

Abstract

The four-induction coil structure of the present invention has two-way locomotive signal receiving antennas, one on each side of the train body, and the left and right receiving antennas are respectively located directly above the center of the left and right rails; when the train is stationary, running in a straight line or turning, the two-way traction return current induced voltage is 0, so that the two-way track circuit signal induced voltage remains equal. The technical advantages of the present invention are as follows: the four-induction coil structure of the present invention can effectively suppress the interference caused by the traction return current under the working conditions of the train being stationary, running and turning, and can always keep the two-way induced signal obtained by the on-board host consistent in size; adopts a design that is convenient for adjusting the frequency response characteristics; and also adds a design for detecting antenna faults in the receiving antenna to improve the accuracy of antenna fault detection.

Description

Technical Field

[0001] The invention relates to the field of locomotive signal control in the railway industry, and in particular to a dual-path locomotive signal receiving antenna. Background Art

[0002] The locomotive signal receiving antenna is a key component for the locomotive signal on-board system equipment and the track circuit reader (TCR) to receive the track circuit signal. It has a large number of applications in the Chinese railway industry. The receiving antenna is hoisted under the car body and aligned with the center of the rail. It senses the current signal in the rail through the principle of electromagnetic induction to form an induced voltage signal, which is sent to the on-board host for decoding. At present, the locomotive signal host and the track circuit reader (TCR) host are mostly two-by-two dual-machine hot standby architectures. Therefore, the locomotive signal receiving antenna needs to provide two redundant sensing signals, corresponding to the A / B systems of the on-board host, and the two systems can be switched between hot standby.

[0003] In addition to being the transmission medium for track circuit signals, rails are also the transmission channel for traction return current of electric locomotives. Therefore, the on-board system should be able to effectively suppress the interference caused by traction return current under various train operating conditions, including when the train is stationary, running in a straight line, and turning.

[0004] With the continuous expansion of application scenarios, different requirements are also put forward for the frequency response characteristics of locomotive signal receiving antennas, so as to better configure various complex scenarios and ensure reliable signal reception. Summary of the invention

[0005] In response to the above requirements, the present invention proposes a dual-path locomotive signal receiving antenna with a four-induction coil structure.

[0006] The present invention provides a dual-channel locomotive signal receiving antenna with a four-induction coil structure, wherein the receiving antenna is composed of a hanging rod, a tail cable, an iron clamp, an iron core, an induction coil assembly, a plastic shell, a filler and a positioning shell.

[0007] The induction coil assembly is made of enameled wire wound on a frame according to a certain number of turns, and then fixed on an iron core with a positioning shell at a certain interval. Iron clamps are installed at both ends of the iron core to fix the iron core and the hanging rod;

[0008] The lead wire of the induction coil assembly is connected to the tail cable as the external signal interface of the receiving antenna, and then is placed in a plastic shell and sealed with a filler;

[0009] In actual application, a dual-channel locomotive signal receiving antenna is hoisted on the left and right sides under the train body, and the left and right receiving antennas are respectively located directly above the center of the left and right rails;

[0010] The traction return current flows in the same direction in the left and right rails, so an induced voltage of the same polarity is generated in the eight induction coils; when the dual-channel locomotive signal receiving antenna senses the track circuit signal, since the track circuit signal current flows in opposite directions in the left and right rails, an induced voltage of two polarities is generated in the eight induction coils;

[0011] The dual-path locomotive signal receiving antenna can make the two-path traction return current induced voltage zero when the train is stationary, running in a straight line or turning, so that the two-path track circuit signal induced voltage remains equal.

[0012] The technical advantages of the present invention are as follows:

[0013] The four-induction coil structure of the present invention can effectively suppress the interference caused by traction return current under conditions such as when the train is stationary, running and turning, and can always keep the two-way induction signal obtained by the on-board host consistent in size, and will not cause the machine to be cut off without reason.

[0014] The locomotive signal receiving antenna of the present invention adopts a design that is convenient for adjusting the frequency response characteristics. When used with the receiving antenna automatic testing system invented by Jiaotong University Sino Company, the design of a receiving antenna with customized frequency response characteristics can be quickly completed.

[0015] In addition, the present invention proposes to add a design for detecting antenna faults in the receiving antenna to improve the accuracy of antenna fault detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The schematic diagram of the structure of the dual-channel locomotive signal receiving antenna of the present invention is

[0017] Figure 2 The application connection diagram of the receiving antenna with four induction coils of the present invention

[0018] Figure 3 Flow chart for customizing the frequency response characteristics of the receiving antenna of the present invention

[0019] Figure 4 A top view of the "C-shaped" folded ear of the receiving antenna of the present invention

[0020] Figure 5 Schematic diagram of the connection for adding a receiving antenna to the detection coil

[0021] Figure 6 Schematic diagram of incorrect connection method of receiving antenna - one-sided connection

[0022] Reference numerals 1-hoisting rod, 2-tail cable, 3-iron clamp, 4-iron core, 5-induction coil assembly, 6-plastic shell, 7-filler, 8-positioning shell DETAILED DESCRIPTION

[0023] The features and advantages of the present invention are described in detail below in conjunction with specific embodiments. The contents will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several variations and improvements may be made without departing from the inventive concept, and these all belong to the protection scope of the present invention.

[0024] The dual-channel locomotive signal receiving antenna designed by the present invention is a key component of the locomotive signal on-board system equipment and the track circuit reader (TCR). It consists of a hanging rod 1, a tail cable 2, an iron clamp 3, an iron core 4, an induction coil assembly 5, a plastic shell 6, a filler 7 and a positioning shell 8, see Figure 1 The induction coil assembly 5 is made of enameled wire wound on the frame according to a certain number of turns, and then fixed on the iron core 4 with a positioning shell 8 at a certain interval. Iron clamps 3 are installed at both ends of the iron core 4 to fix the iron core 4 and the hanging rod 1. The lead wire of the induction coil assembly 5 is connected to the tail cable 2 as the external signal interface of the receiving antenna, and then installed in the plastic shell 6, and the filler 7 is used for potting and sealing.

[0025] The receiving antenna designed in the present invention has the function of improving resistance to traction current interference and always keeping the dual-path induced voltage consistent when the train is stationary, running in a straight line or turning; it can be used in conjunction with the receiving antenna frequency response characteristic automatic test system designed by Jiaotong University Sino Company to customize the design of a receiving antenna with specific frequency response characteristics; it can also cooperate with a locomotive signal host or a track circuit reader (TCR) host to complete the receiving antenna self-test function.

[0026] The principle of improving the anti-traction current interference function is as follows:

[0027] See also Figure 2 In actual application, a dual-channel receiving antenna is installed on each side of the train body, and the left and right receiving antennas are located directly above the center of the left and right rails. The four induction coils in the left dual-channel receiving antenna are W1 from left to right. 左 To W4 左 The four induction coils in the right dual-path receiving antenna are W1 from left to right. 右 To W2 右 .W1 左 、W3 左 、W1 右 、W3 右 Connected in series, the connection relationship is W1 左 The right end of the connection W3 左 The left endpoint, W3 左 Connect the right end of W1 右 The right end point, W1 右 The left end of the connection W3右 The right end of the remaining unconnected W1 左 The left endpoint and W3 右 The left end points of W2 serve as the two end points of the first path of the dual-path sensing signal. 左 、W4 左 、W2 右 、W4 右 Connected in series, the connection relationship is W2 左 Connect the right end of W4 左 The left endpoint, W4 左 Connect the right end of W2 右 The right end point, W2 右 Connect the left end of W4 右 The right end point of the remaining unconnected W2 左 The left endpoint and W4 右 The left end points serve as the two end points of the second path of the dual-path sensing signal.

[0028] The traction return current flows in the same direction in the left and right rails, so the induced voltages of the same polarity are generated in the eight induction coils, and the voltage values ​​are V1 左 To V4 右 For example, the left end of each induction coil is the positive pole, and the right end is the negative pole. According to the above connection relationship, W1 左 、W3 左 、W1 右 、W3 右 After series connection, W1 左 and W3 左 The induced voltage of the traction return current is added, W1 右 and W3 右 The induced voltages of the traction return are added together, and finally the two added induced voltages are connected with the same polarity to obtain the first traction return induced voltage V 一路 =V1 左 +V3 左 -(V1 右 +V3 右 ). Similarly, the second traction return current induced voltage V 二路 =V2 左 +V4 左 -(V2 右 +V4 右 ).

[0029] When the train is stationary or moving in a straight line, the left and right receiving antennas are aligned with the center of the rail, V1 左 、V4 左 、V1 右 、V4 右 The induced voltage value is equal to V2 左 、V3 左、V2 右 、V3 右 The induced voltage value is equal, so the first traction return induced voltage V 一路 The value is 0, the second traction return current induction voltage V 二路 When the train turns, the two receiving antennas mounted under the train body will shift to one side and no longer align with the center of the rail. For example, if the receiving antenna shifts to the left side of the rail, the induced voltage of the eight induction coils will change as follows: V1 左 、V2 左 、V1 右 、V2 右 The induced voltage value becomes smaller, V3 左 、V4 左 、V3 右 、V4 右 The induced voltage value increases, and the amount of increase and decrease is ΔV, so the first traction return induced voltage V 一路 =(V1 左 -ΔV)+(V3 左 +ΔV)-((V1 右 -ΔV)+(V3 右 +ΔV)), that is, V 一路 is 0. Similarly, the second traction return current induction voltage V 二路 is 0.

[0030] When the dual-channel locomotive signal receiving antenna senses the track circuit signal, since the track circuit signal current flows in opposite directions in the left and right rails, two polarity induced voltages are generated in the eight induction coils, and the voltage values ​​are U1 and U2, respectively. 左 To U4 右 For example, if the left end point of each induction coil in the left receiving antenna is positive and the right end point is negative, then the left end point of each induction coil in the right receiving antenna is negative and the right end point is positive. Figure 2 The connection relationship, W1 左 、W3 左 、W1 右 、W3 右 After the series connection, the signal induced voltage of the first track circuit is the sum of the induced voltages of each induction coil, U 一路 =U1 左 +U3 左 +U1 右 +U3 右 .W2 左 、W4 左 、W2 右 、W4 右 After the series connection, the signal induced voltage of the second track circuit is the sum of the induced voltages of each induction coil, U 二路 =U2 左+U4 左 +U2 右 +U4 右 .

[0031] When the train is stationary or moving in a straight line, the left and right receiving antennas are aligned with the center of the rail, U1 左 、U4 左 、U1 右 、U4 右 The induced voltage value is equal to that of U2 左 、U3 左 、U2 右 、U3 右 The induced voltage values ​​of the first track current signal are equal, so the induced voltage value of the first track current signal is equal to the induced voltage value of the second track circuit signal, that is, U 一路 =U 二路 When the train turns, the two receiving antennas mounted under the train body will shift to one side and no longer be aligned with the center of the rail. For example, if the receiving antenna shifts to the left side of the rail, the induced voltage of the eight induction coils will change as follows: U1 左 、U2 左 、U1 右 、U2 右 The induced voltage value becomes smaller, U3 左 、U4 左 、U3 右 、U4 右 The induced voltage value increases, and the amount of increase and decrease is ΔU, so the induced voltage U of the first track circuit signal 一路 =(U1 左 -ΔU)+(U3 左 +ΔU)+(U1 右 -ΔU)+(U3 右 +ΔU), that is, U 一路 The value of remains unchanged. Similarly, the signal induced voltage U 二路 The value remains unchanged, so the induced voltages of the two track circuit signals remain equal when the train turns.

[0032] From the above analysis, it can be seen that the dual-path locomotive signal receiving antenna designed in the present invention can ensure reliable reception of track circuit signals and suppress interference caused by traction current when the train is stationary, running in a straight line or turning.

[0033] The dual-channel locomotive signal receiving antenna of the present invention adopts a design with adjustable frequency response characteristics. The adjustable components include an iron core 4, an iron clamp 3, and the relative position of the iron core 4 and the induction coil assembly 5. The iron core uses a composite material, which is composed of silicon steel sheets, iron sheets, non-magnetic medium materials (such as wood chips, rubber sheets), etc. in a certain proportion. The composite iron core is installed in a positioning shell 8, and there are positioning grooves arranged at a certain interval on the outside of the shell 8. The inner wall of the skeleton of the induction coil assembly 5 is designed with a retractable positioning tooth head, which can be stuck in the positioning groove.

[0034] The customized adjustment of the frequency response characteristics of the dual-channel locomotive signal receiving antenna of the present invention needs to be matched with the automatic test system for the frequency response characteristics of the receiving antenna designed by Jiaotong University Sino Company (the invention of the automatic test system has been applied for on the same day as the present invention). The automatic test system is based on phase-locked amplification technology and automatic control technology, and has the advantages of high test efficiency and high test accuracy. In addition, for the adjustable design of the frequency response characteristics of the receiving antenna of the present invention, the automatic test system can combine the experience database to intelligently recommend the optimization design model, so that the dual-channel receiving antenna designed by the present invention can quickly complete iteration and verification with the help of the test system, thereby obtaining a receiving antenna design that meets the expected needs.

[0035] The customized adjustment process of the receiving antenna is as follows:

[0036] See also Figure 3 The flowchart of the test system first needs to set the target frequency response characteristic parameter index in the test system, and then use the automatic test system to measure the frequency response characteristics of the receiving antenna. After the measurement, determine whether the measured frequency response characteristic index meets the target value. If it does, no adjustment is required to complete the antenna design. If not, the system will continue to give a recommended optimization adjustment plan based on the measurement results. After adjusting the receiving antenna according to the adjustment plan, repeat the above steps again until the receiving antenna frequency response characteristics converge to the preset target value.

[0037] The means for adjusting the frequency response characteristics of the receiving antenna include:

[0038] 1) Adjust the material composition of the iron core 4 and the relative position of the induction coil assembly 5 and the iron core 4. Adding silicon steel sheets can improve the high-frequency frequency response characteristics and suppress the low-frequency frequency response characteristics; adding iron sheets can improve the low-frequency frequency response characteristics and suppress the high-frequency frequency response characteristics; the closer the induction coil assembly 5 is to the two ends of the iron core 4, the more it suppresses the full-frequency frequency response characteristics, and the closer it is to the center, the more it improves the full-frequency frequency response characteristics.

[0039] 2) Adjust the width of the iron clamp 3. The wider the iron clamp 3 is, the better the low-frequency response characteristics can be, and the higher-frequency response characteristics can be suppressed.

[0040] 3) Add "C-shaped" folding ears made of silicon steel sheets on both sides of the iron clamp 3, see Figure 4This method can improve the frequency response characteristics in the high frequency band.

[0041] The automatic test system is based on the above-mentioned adjustment means, combined with historical test data, and organizes and establishes a target-driven adjustment means database. According to the preset target parameter indicators of the receiving antenna, the automatic test system intelligently recommends an optimized receiving antenna design model (including the above-mentioned adjustable parameters quantified in the current stage) during the entire design and test process.

[0042] The advantages of the above customized design process are as follows: The receiving antenna of the present invention adopts an adjustable design, which is convenient for adjusting the frequency response characteristics of the receiving antenna by various means, and is combined with the receiving antenna frequency response characteristics automatic test system invented by Jiaotong University Sino Company, which can quickly complete testing, adjustment and verification, and deliver antenna designs that meet target requirements, thereby improving R&D efficiency.

[0043] The function of completing the self-check of the receiving antenna by cooperating with the locomotive signal host or the track circuit reader (TCR) host refers to adding a detection coil to the dual-path receiving antenna, see Figure 5 The detection coils are not connected in series, but correspond to the A / B system of the vehicle host. Figure 2 . The detection coils in the left and right receiving antennas serve as transmitting antennas, and are driven by the vehicle host A / B system to transmit self-test signals (the self-test signal can be a single-frequency signal, and its frequency and amplitude are determined by the internal protocol, not limited to a certain frequency value. There are 8 single-frequency signals corresponding to the 8 parallel port light positions of the locomotive signal machine). The two systems receive the signals induced by the corresponding detection coils and analyze the signal characteristics. If the frequency of the single-frequency signal collected by the vehicle host A or B system is consistent with the transmitted frequency, and the signal amplitude is within a certain range, it can be determined that the receiving antenna is normal; otherwise, it is determined that the receiving antenna path is abnormal: when the frequency of the received single-frequency signal is correct and the amplitude is less than a certain value, it is determined that the receiving antenna is short-circuited; when the single-frequency signal is not received, it is determined that the receiving antenna is open-circuited. If the vehicle host A system sends a self-test signal, it can detect whether the left receiving antenna is normal. If the vehicle host B system sends a self-test signal, it can detect whether the right receiving antenna is normal.

[0044] When the receiving antenna is connected correctly, that is, the left receiving antenna and the right receiving antenna are used in series, see Figure 5 , you can use the above self-test method to detect whether the two receiving antennas are normal, short-circuited or open-circuited.

[0045] If the receiving antenna is not connected correctly, that is, the four induction coils in the left receiving antenna are connected in series, and the four induction coils in the right receiving antenna are connected in series, see Figure 6, when the vehicle host A or B sends a detection signal, only one system can receive the detection signal, and the other system cannot receive the detection signal. This method can detect the problem of incorrect connection of the receiving antenna (one-sided connection).

[0046] Technical advantages of the present invention:

[0047] 1) The receiving antenna can effectively suppress the interference generated by the traction current, always keep the amplitude of the dual-path induced voltage signal consistent, and improve the reliability and availability of the locomotive signal on-board system equipment and the track circuit reader (TCR).

[0048] 2) The adjustable design of the receiving antenna can provide a receiving antenna that meets standard requirements and a customized receiving antenna that meets specific application scenarios, which improves product applicability and saves the cost of further research and development.

[0049] 3) The receiving antenna extends the self-check range and improves the availability of the vehicle-mounted system.

[0050] The terms and expressions used in this article are for descriptive purposes only. The present invention is not limited to these terms and expressions. The use of these terms and expressions does not mean the exclusion of any equivalent features illustrated and described. Possible modifications, changes and substitutions should also be included in the scope of the claims, and the claims should be deemed to cover these equivalents.

Claims

1. A dual-channel locomotive signal receiving antenna with a four-induction coil structure, the receiving antenna is composed of a hanging rod, a tail cable, an iron clamp, an iron core, an induction coil assembly, a plastic shell, a filler and a positioning shell. The induction coil assembly is made of enameled wire wound on a frame according to a certain number of turns, and then fixed on an iron core with a positioning shell at a certain interval. Iron clamps are installed at both ends of the iron core to fix the iron core and the hanging rod; The lead wire of the induction coil assembly is connected to the tail cable as the external signal interface of the receiving antenna, and then is placed in a plastic shell and sealed with a filler; In actual application, a dual-channel locomotive signal receiving antenna is hoisted on the left and right sides under the train body, and the left and right receiving antennas are respectively located directly above the center of the left and right rails; The traction return current flows in the same direction in the left and right rails, so an induced voltage of the same polarity is generated in the eight induction coils; when the dual-channel locomotive signal receiving antenna senses the track circuit signal, since the track circuit signal current flows in opposite directions in the left and right rails, an induced voltage of two polarities is generated in the eight induction coils; The dual-path locomotive signal receiving antenna can make the two-path traction return current induced voltage zero when the train is stationary, running in a straight line or turning, so that the two-path track circuit signal induced voltage remains equal; The receiving antenna adopts an adjustable frequency response characteristic design, and the frequency response characteristic of the receiving antenna is changed by adjusting the parameters of various components in the receiving antenna, so that the frequency response characteristic of the receiving antenna meets expectations; The means for adjusting the frequency response characteristics include: adjusting the material composition of the composite iron core and adjusting the relative position of the induction coil and the iron core; adjusting the width of the iron clamp; and adding "C-shaped" folded ears made of silicon steel sheets on both sides of the iron clamp.

2. The receiving antenna according to claim 1, characterized in that Adding silicon steel sheets can improve the frequency response characteristics of the high frequency band and suppress the frequency response characteristics of the low frequency band; adding iron sheets can improve the frequency response characteristics of the low frequency band and suppress the frequency response characteristics of the high frequency band; The closer the induction coil is to the two ends of the core, the more it suppresses the frequency response characteristics of the full frequency band, and the closer it is to the center, the more it improves the frequency response characteristics of the full frequency band; The wider the iron clip is, the better it can improve the low-frequency response characteristics and suppress the high-frequency response characteristics. Adding folded ears can improve the frequency response characteristics in the high frequency band.

3. The receiving antenna according to claim 1, characterized in that A detection coil may be added to the dual-path locomotive signal receiving antenna. The detection coils are not connected in series on the left and right sides, but correspond to the A / B series of the vehicle-mounted host respectively.

4. The receiving antenna according to claim 3, characterized in that The detection coils in the left and right receiving antennas serve as transmitting antennas, and are driven by the A / B series of the vehicle host to transmit self-test signals; the two series of vehicle hosts receive the signals induced by the corresponding detection coils and analyze the signal characteristics.

5. The receiving antenna according to claim 4, characterized in that Perform antenna detection in the following self-test mode: If the signal frequency collected by the vehicle host A or B is consistent with the self-test signal frequency sent, and the signal amplitude is within a certain range, it can be determined that the receiving antenna is normal; Otherwise, it is determined that the receiving antenna path is abnormal; When the frequency of the received single-frequency signal is correct and the amplitude is less than a certain value, it is determined that the receiving antenna is short-circuited; when the single-frequency signal cannot be received, it is determined that the receiving antenna is open-circuited.

6. The receiving antenna according to claim 5, characterized in that If the vehicle host A sends a self-test signal, it can detect whether the left receiving antenna is normal; if the vehicle host B sends a self-test signal, it can detect whether the right receiving antenna is normal.

7. The receiving antenna according to claim 6, characterized in that The receiving antennas are connected correctly, that is, when the left receiving antenna and the right receiving antenna are used in series, the above self-test method can be used to detect whether the two receiving antennas are normal, short-circuited or open-circuited; If the receiving antenna is not connected correctly, when the vehicle host A or B sends a detection signal, only one system can receive the detection signal, and the other system cannot receive the detection signal, then it can be detected that the receiving antenna is unilaterally connected incorrectly.

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