JP2016015795A - On-vehicle apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an on-vehicle apparatus including therein a function of correcting a degree of coupling of an on-vehicle element and performing correction of the degree of coupling of the on-vehicle element on the apparatus side.SOLUTION: An on-vehicle apparatus 1, including an on-vehicle element 2 consisting of a transmission-side coil 3 and a reception-side coil 4, performs: extracting a difference in frequency characteristics between a transmission signal 12 and a reception signal 13 that are respectively output from a transmission-side monitor circuit 18 connected to an output side of an oscillation circuit 20 connected to the transmission-side coil 3 and from a reception-side monitor circuit 19 connected to an output side of a reception circuit 21 connected to the reception-side coil 4; and correcting, inside the on-vehicle apparatus 1, a degree of coupling (M) of the on-vehicle element 2.

Description

  The present invention relates to an on-vehicle device, and more particularly to an on-vehicle device in which a coupling degree adjustment of an on-vehicle element is performed.

  For example, an apparatus that performs vehicle control, such as an automatic train stop device (ATC device), is configured such that, when the vehicle upper is coupled to the ground child, the oscillation frequency is changed to the resonance frequency of the ground child, thereby The control unit receives the control information from the ground unit, and the control unit on the vehicle unit side performs vehicle control according to the control information.

  The vehicle upper part is composed of a pair of transmission coils and reception coils, and is electromagnetically coupled to maintain an oscillation state to cause a frequency change phenomenon. The degree of coupling is the degree of coupling, and this degree of coupling is adjusted by changing the positions of the transmission coil and the reception coil with the adjustment bar. In this specification, changing the degree of coupling by changing the positions of the transmission coil and the reception coil with the adjustment bar is referred to as “coupling degree adjustment”.

  A test for adjusting the coupling degree on a regular basis is required for the vehicle upper part. In this test, first, the cable of the car upper is reconnected and connected to the coupling degree tester. Then, while confirming the coupling degree from the coupling degree tester, the coupling degree is adjusted manually using a coupling degree adjusting bracket attached to the vehicle upper element.

  Japanese Patent Application Laid-Open No. 2004-133867 proposes an on-board element inspection device that automatically adjusts the degree of coupling. Here, the metal piece holding part holds the metal piece so that the metal piece can be moved so that the degree of coupling of the vehicle upper body changes according to the position. The coupling degree measurement unit outputs a measurement signal on the vehicle and measures the coupling degree. Since the position of the metal piece is variable and the coupling degree measurement unit is provided, the adjustment control unit automatically adjusts the coupling degree to the set value by controlling the position of the metal piece based on the measurement value of the coupling degree. , And there is a description.

  Therefore, Patent Document 2 proposes an on-board device that facilitates adjustment of the degree of coupling of the vehicle element by monitoring the monitor signal corresponding to the output of the amplifier circuit to know the degree of coupling. Here, the amplifier circuits are cascaded to form a multistage amplifier circuit. The vehicle upper part includes a pair of coils coupled to each other, one coil is connected to the output side of the final stage amplifier circuit, and the other coil is connected to the input side of the first stage amplifier circuit to provide a feedback circuit for the multistage amplifier circuit. Configure. The amplifier circuit and the vehicle upper part constitute an oscillation circuit that oscillates at a predetermined oscillation frequency. It is described that the monitor circuit is connected to the output side of the amplifier circuit located in front of the amplifier circuit in the final stage and outputs a monitor signal corresponding to the output of the amplifier circuit.

  The technique disclosed in Patent Document 2 can adjust the degree of coupling between a pair of coils while monitoring a monitor circuit. This is a technique that has been improved so that the work of confirming the degree of coupling from the coupling degree tester by switching the cable of the vehicle upper arm and connecting it to the coupling degree tester can be performed on the monitor. However, the coupling degree adjustment work itself is manually adjusted by using a coupling degree adjusting bracket attached to the vehicle upper element.

  As described above, an apparatus that performs vehicle control, such as an automatic train stop device (ATC device), is configured such that when the vehicle upper member is coupled to the ground element, the oscillation frequency is constantly changed to the resonance frequency of the ground element. "Zhou phenomenon" is used. Therefore, the influence of the noise by a ground element or a metal object occurs. For example, since the transmitting coil and the receiving coil are close to each other, the mutual induction action generates noise in the receiving circuit and affects the characteristics of the transmitting circuit.

  Patent Document 3 proposes a vehicle upper body in which a coil is provided so as not to affect transmission and reception. Here, in a vehicle upper body in which a transmission coil and a reception coil are arranged in one mounting frame, the transmission coil and the reception coil are in a positional relationship where the coupling degree associated with mutual induction is the lowest value. There is a description that it is provided while keeping.

  Further, Patent Document 4 proposes an ATS device provided with an oscillation circuit, not an ATS device based on a variable frequency system using a feedback oscillation circuit. Here, the on-board device has a signal generator that stably and constantly generates a frequency corresponding to a ground element installed on the ground. When the ATS device approaches the ground element that the train is transmitting a predetermined frequency, and the vehicle upper element and the ground element are placed in an electromagnetic coupling state, the frequency of the vehicle upper element is tuned to the frequency of the ground element. Be made. Thereby, the on-board device can detect that the train has arrived at the position of the ground unit.

JP 2010-93951 A Japanese Patent Laid-Open No. 09-2221030 Japanese Patent Laid-Open No. 10-278797 JP 2005-229789 A

  Conventionally, in an automatic train stop device (ATS-S type), it has been necessary to adjust the coupling degree of the vehicle upper part. In order to carry out this adjustment, it is necessary to remove the cable attached to the vehicle upper core and connect it to the connectivity tester. This work has to be performed on the vehicle, which is a troublesome work.

  In addition, the degree of coupling of the vehicle upper element is the sum of the reception level induced by the coupling between the transmission antenna and the reception antenna and the reception level due to external influences such as ground elements and metal objects, as the reception waveform. Therefore, there has been a problem that it is impossible to accurately measure a change in reception level due to external influences.

  An object of the present application is to provide an on-board device that solves such a problem, has a function of correcting the coupling degree of the vehicle upper part inside the apparatus, and can correct the coupling degree of the vehicle upper part on the apparatus side. is there.

  In order to achieve the above object, an on-board device according to the present invention is connected to an output side of an oscillation circuit connected to a transmission-side coil in an on-vehicle device including an on-vehicle element composed of a transmission-side coil and a reception-side coil. The difference between the frequency characteristics of the transmission signal and the reception signal output from the transmission side monitor circuit and the reception side monitor circuit connected to the output side of the reception circuit connected to the reception side coil is extracted and installed on the vehicle. It is characterized by correcting the coupling degree of the child.

  With the above configuration, the on-board device extracts a difference in frequency characteristics between the transmission signal and the reception signal output from the transmission side monitoring circuit and the reception side monitoring circuit, and performs digital numerical processing. As a result, it is not necessary to adjust the coupling degree of the vehicle upper member, and it is possible to save the trouble of removing the cable attached to the vehicle upper member and attaching it to the testing machine.

  Further, it is preferable that the on-board device separates and extracts the reception level outside the on-board element by removing the influence of the reception level induced by the coupling between the transmission side coil and the reception side coil. In this way, the coupling degree is corrected by digital processing, and the received data with higher accuracy can be measured.

  In the on-board device, it is preferable that a difference in frequency characteristics is extracted after the level of the transmission signal output from the reception-side monitor circuit is adjusted, and the degree of coupling of the on-board device is corrected in the device. Thereby, although the transmission signal output from the reception-side monitor circuit has the same waveform, the difference in frequency is easily detected by adjusting the output level, and the change in the reception level due to the external environment can be accurately measured.

  As described above, according to the on-board device of the present invention, there is provided an on-board device that has a function of correcting the coupling degree of the vehicle upper part inside the apparatus and corrects the coupling degree of the vehicle upper part on the device side. be able to.

It is explanatory drawing which shows schematic structure of one Embodiment of the on-vehicle apparatus which concerns on this invention. It is a block diagram which shows the structure of one Example of a reception determination part. It is explanatory drawing which shows the graph of the reception level for every frequency.

(Configuration of on-board device)
Hereinafter, embodiments of an on-board device 1 according to the present invention will be described in detail with reference to the drawings. FIG. 1 shows a schematic configuration of one embodiment of an on-vehicle device 1 according to the present invention. The on-vehicle device 1 according to the present invention includes an on-vehicle element 2, an oscillation circuit 20, a reception circuit 21, and a reception determination unit 10.

  The vehicle upper 2 is composed of a pair of a transmission side coil 3 and a reception side coil 4 that are coupled to each other with a pitch interval (L). The transmission side coil 3 and the reception side coil 4 are coupled by a coupling degree (M). The transmission side coil 3 is connected to the oscillator 5, and the reception side coil 4 is connected to the receiver 11.

For example, the oscillator 5 oscillates at a constant transmission frequency (f ₀ ) or performs transmission while changing the frequency so as to cover the frequency band of the ground element. The oscillation circuit 20 is connected from the oscillator 5 via the oscillation amplifier 6 and the filter 7 to the transmission side coil 3 of the vehicle upper element 2. On the other hand, the receiving circuit 21 is connected from the transmitting coil 3 of the vehicle upper 2 to the receiver 11 via the transformer 8, the amplifier 6, and the filter 7.

  The present invention further includes a reception determination unit 10 in addition to the configurations of the vehicle upper element 2, the oscillation circuit 20, and the reception circuit 21, which are existing technologies. The reception determination unit 10 includes a transmission signal 12 output from the transmission-side monitor circuit 18 connected to the output side of the oscillation circuit 20 connected to the transmission-side coil 3, and a reception circuit 21 connected to the reception-side coil 4. A difference in frequency characteristic from the reception signal 13 output from the reception-side monitor circuit 19 connected to the output side is extracted, and the degree of coupling of the vehicle upper element 2 is corrected in the on-vehicle apparatus 1.

  FIG. 2 is a block diagram showing the configuration of one embodiment of the reception determination unit 10. The reception determination unit 10 includes a level adjustment unit 14, a difference calculation unit 15, a coupling degree calculation unit 16, and an external signal measurement unit 17.

  The level adjustment unit 14 adjusts the level difference and phase difference of the received signal 13 to the receiver 11. That is, the reception level (V1) and the reception level (V2) can be separated by matching the levels and phases of the transmission level and the reception level. The difference calculation unit 15 calculates the difference between the reception level (V1) and the reception level (V2) after the level adjustment unit 14 adjusts the reception level (V1). The degree of coupling calculation unit 16 calculates the degree of coupling (M) of the vehicle upper element 2 because the degree of coupling (M) increases as the reception level (V2) from the ground increases. Furthermore, the external signal measuring unit 17 measures the reception level (V2) due to external influences such as ground elements and metal objects. In this specification. In this way, the level and phase of the transmission level and the reception level are matched by digital processing. The separation of the reception level (V1) and the reception level (V2) is referred to as “coupling correction”.

  FIG. 3 shows a graph of the reception level for each frequency. The coupling degree correction will be described using this graph. The reception waveform of the vehicle upper 2 is the sum of the reception level (V1) induced by the coupling between the transmission antenna and the reception antenna and the reception level (V2) due to external influences such as a ground element and a metal object. It is. The graph of FIG. 3 is a graph of voltage (V) for each frequency (f), and shows frequency characteristics of the reception level. FIG. 3A shows the reception level (V1) induced by the coupling between the transmission antenna and the reception antenna. FIG. 3B shows the reception level (V2) due to external influences such as ground elements and metal objects. FIG. 3C shows the sum of the reception levels V1 and V2, which is a reception waveform of the vehicle upper 2. Here, since the reception level (V1) in FIG. 3 (a) is a transmission level, calculating the difference between the frequency of the transmission level and the reception level, the external elements such as ground elements and metal objects shown in FIG. 3 (c). The reception level (V2) due to the influence of the above.

  Thus, the reception level (V1) induced by the coupling between the transmitting antenna and the receiving antenna based on the coupling degree (M) can be corrected by digital numerical processing. By this correction, first, the difference between the frequency of the transmission level and the reception level can be calculated, and second, the reception level (V2) due to external influences such as ground elements and metal objects can be separated and extracted.

  Specifically, when the level of the transmission signal 12 is 10 Vpp and the level of the reception signal is 0.1 Vpp, 100 times the reception level is the same level as the transmission signal 12. Therefore, the level adjustment unit 14 performs an operation of multiplying the received signal level by 100. Vpp means the difference between the peak and valley of the voltage value in the signal waveform.

  After performing this operation, the difference calculation unit 15 performs the correction by subtracting the voltage value (V1) for each frequency in FIG. 3 (a) from the voltage value (V1 + V2) for each frequency in FIG. 3 (c). In this case, the influence of the reception level induced by the coupling between the transmission side coil 3 and the reception side coil 4 can be eliminated. And after removing this, it becomes only the reception level (V2) by the exterior of the vehicle upper 2.

  The configuration, shape, size, and arrangement relationship described in the above embodiments are merely schematically shown to the extent that the present invention can be understood and implemented. Therefore, the present invention is not limited to the described embodiments, and can be variously modified without departing from the scope of the technical idea shown in the claims.

DESCRIPTION OF SYMBOLS 1 On-vehicle apparatus, 2 vehicle upper part, 3 transmission side coil, 4 reception side coil, 5 oscillator, 6 amplifier, 7 filter, 8 transformer, 10 reception determination part, 11 receiver, 12 transmission signal, 13 reception signal, 14 Level adjustment unit, 15 difference calculation unit, 16 coupling degree calculation unit, 17 external signal measurement unit, 18 transmission side monitor circuit, 19 reception side monitor circuit, 20 oscillation circuit, 21 reception circuit, L pitch interval, M coupling degree.

Claims (3)

In the on-board device including the vehicle upper member composed of the transmission side coil and the reception side coil,
Transmission signal and reception signal output from the transmission side monitor circuit connected to the output side of the oscillation circuit connected to the transmission side coil and the reception side monitor circuit connected to the output side of the reception circuit connected to the reception side coil The on-vehicle device is characterized in that a difference in frequency characteristics is extracted and a coupling degree correction of the vehicle upper is performed in the device.   The on-vehicle device according to claim 1, wherein the reception level induced by the coupling between the transmission side coil and the reception side coil is removed to separate the reception level from outside the vehicle element. An on-vehicle device characterized by being extracted. 3. The on-board device according to claim 1, wherein the received signal output from the receiving-side monitor circuit is level-adjusted, and a frequency characteristic difference is extracted to correct the on-board coupling degree in the device. An on-vehicle device characterized in that

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