JP2019001375A - On-vehicle communication device, on-vehicle communication system and vehicle with on-vehicle communication device mounted thereon - Google Patents

Abstract

To solve the problem that it is difficult to adjust a transmission level due to a change in a target current because an antenna characteristic is changed to change a relation between an antenna current and an electric power amount of a power wave per turn of antenna in the case of transmitting a power wave of different frequency by changing the number of turns of a power wave transmission antenna.SOLUTION: An on-vehicle communication device includes: a power wave transmission antenna having the fixed number of turns to transmit a power wave to a ground unit; a resonance circuit group for constituting two or more series circuit from two or more resonance capacitors and two or more resonance inductors to be connected to the power wave transmission antenna; a switching part for selectively switching any one series circuit from the two or more series circuits on the basis of a switching command; a frequency selection part for outputting a switching command and selecting, as a frequency of the power wave, a frequency that is coincided with a resonance frequency determined by one series circuit switched on the basis of the switching command and the power wave transmission antenna; and a power wave generation part for outputting a power wave of the frequency selected by the frequency selection part.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vehicle-mounted communication device, a vehicle-mounted communication system, and a vehicle equipped with the vehicle-mounted communication device. For example, an on-vehicle communication device having a function of switching a plurality of resonance circuits in a railway vehicle is targeted.

  As background art of this technical field, for example, Japanese Patent No. 3842142 (Patent Document 1) states that “in order to drive a non-powered ground element, a transponder is used from a train on-board device to The on-vehicle transmission / reception apparatus which switches the transmission frequency of the power wave transmitted to the power ground unit to a different frequency according to the switching condition on the on-board device side and drives the non-power source ground unit having a different frequency with one type of vehicle top unit " The invention is disclosed, and regarding the configuration of the on-vehicle transmission / reception apparatus, “the power wave transmission unit includes two sets of power wave frequency oscillators, a power wave amplifier, and a power wave transmission switching circuit, and one power wave frequency oscillator Generates a power wave of frequency f1, the other power wave frequency oscillator generates a power wave of frequency f2 different from frequency f1, and one power wave amplifier has frequency f1 selected under the power wave transmission frequency selection condition. When the power wave of frequency f1 output from one power wave frequency oscillator is amplified to a specified level and output, and the other power wave amplifier is selected when frequency f2 is selected under the power wave transmission frequency selection condition The power wave of frequency f2 output from the other power wave frequency oscillator is amplified to a specified level and output, and the power wave transmission switching circuit outputs the power wave of frequency f1 and frequency f2 according to the power wave transmission frequency selection condition. The power wave is switched and sent to the vehicle upper element, and the power wave transmission unit of the vehicle upper element has a resonance circuit of frequency f1, a resonance circuit of frequency f2, and a resonance circuit switching unit, and the resonance circuit of frequency f1 is a resonance capacitor. And a coil formed by the maximum number of turns of the power wave transmitting antenna constitute a series resonant circuit, and the resonant circuit having a frequency f2 higher than the frequency f1 is an intermediate capacitor between the resonant capacitor and the power wave transmitting antenna. A series resonance circuit is configured with a coil having the number of turns formed in a loop, and the resonance circuit switching unit switches the resonance circuit of the frequency f1 and the resonance circuit of the frequency f2 in accordance with the power wave transmission frequency selection condition, from the power wave transmission unit. It sends out the transmitted power wave. "

Japanese Patent No. 3842142

  In Patent Document 1, the resonance circuit having a frequency f1 of the vehicle upper part is a series resonance circuit composed of a resonance capacitor and a coil formed by the maximum number of turns of the power wave transmission antenna, and has a frequency f2 higher than the frequency f1. The resonant circuit comprises a series resonant circuit with a coil having the number of turns formed by an intermediate tap between the resonant capacitor and the power wave transmitting antenna, and the resonant circuit switching unit is a resonant circuit having a frequency f1 according to the power wave transmitting frequency selection condition. And switching the resonance circuit of the frequency f2 to send out the power wave sent from the power wave transmission unit.

  However, according to the configuration described in Patent Document 1, the number of turns of the power wave transmitting antenna changes between the frequency f1 transmission and the frequency f2 transmission. That is, the characteristics of the antenna change between the frequency f1 transmission and the frequency f2 transmission, and the relationship between the antenna current per antenna turn and the amount of power of the power wave sent to the ground unit changes. Even if the transmission level is adjusted by monitoring the antenna transmission current, the target current changes between f1 transmission and f2 transmission when transmission of constant power, and adjustment of the transmission level becomes difficult. There is a problem that it is desired to easily adjust the transmission level.

  Furthermore, the power wave transmission unit described in Patent Document 1 includes two sets of power wave frequency oscillators and power wave amplifiers, and a power wave transmission switching circuit, and which output is selected depends on the power wave transmission frequency selection condition It depends on. That is, of the two sets of power wave frequency oscillators and power wave amplifiers, the power wave frequency oscillators and power wave amplifiers that are actually connected to and functioning with the vehicle top are either one, and the other functions. Not. Therefore, in the above configuration, the total operating rate of the two sets of circuits is 0.5, and the mounted circuit does not function efficiently. In addition, since two mounting areas are required, the mounting area is twice as large as the conventional configuration in which the power wave frequency is not switched.

  In addition, when switching the resonance circuit, an abnormality (frequency setting abnormality) occurs in which the power wave frequency output from the on-vehicle transceiver does not match the set frequency of the on-board element due to a failure of the relay or the like. Therefore, a mechanism for detecting this frequency setting abnormality is also necessary.

Therefore, in the present invention, switching of a plurality of resonance circuits corresponding to a plurality of power waves having different frequencies is performed without changing the number of turns of the power wave transmitting antenna between the frequency f1 transmission and the frequency f2 transmission of the power wave. An on-vehicle communication device is provided.
In the present invention, the power wave frequency oscillator and the power wave amplifier and the power wave transmission switching circuit are switched by switching the transmission frequency of the power wave frequency oscillator between the frequency f1 transmission and the frequency f2 transmission of the power wave. And an on-vehicle communication device that enables transmission of a plurality of power waves having different frequencies using only one set of a power wave frequency oscillator and a power wave amplifier.

  In order to solve the above-described problems, an on-board communication device according to the present invention is mounted on a vehicle and has a fixed number of turns and transmits a power wave to a ground element, and two or more resonances A resonance circuit group configured by connecting two or more series circuits from a capacitor and two or more resonance inductances and connected to the power wave transmitting antenna, and one of the two or more series circuits based on a switching command. A switching unit that selects and switches, and a frequency that outputs a switching command and selects a frequency that matches a resonance frequency determined by any one of the series circuit and the power wave transmitting antenna that is switched based on the switching command as the frequency of the power wave A selection unit and a power wave generation unit that outputs a power wave having a frequency selected by the frequency selection unit are provided.

According to the present invention, when transmitting power waves having a plurality of different transmission frequencies, it is not necessary to change the number of turns of the antenna by switching the resonance circuit according to the frequency. Level control can be easily performed. Further, since the number of antenna turns is fixed, the structure of the antenna can be simplified and the apparatus cost can be reduced.
Furthermore, according to the present invention, it is possible to generate power waves of a plurality of different transmission frequencies with only one set of power wave frequency oscillator and power wave amplifier, so that the mounting area of the power wave generating unit can be reduced. Since it can be configured with only one set, the apparatus cost can be reduced.
In addition, according to the present invention, the transmission output impedance in the frequency band other than the resonance frequency can be increased by switching the resonance frequency using the resonance capacitor and the resonance inductor. As a result, when the above-described frequency setting abnormality occurs, the power wave current is significantly reduced compared to that during normal operation. Therefore, the power wave monitoring circuit detects the decrease in the power wave current to detect the frequency setting. Abnormalities can be detected.

FIG. 1 is a diagram showing a configuration of a first embodiment of the on-board communication device according to the present invention. FIG. 2 is a diagram illustrating a configuration of a system that transmits and receives information between a train and a ground signal system. FIG. 3 is a diagram illustrating a flow of an operation mode (resonance circuit switching procedure) of the on-board communication device according to the first embodiment. FIG. 4 is a diagram showing a configuration of a second embodiment of the on-board communication device according to the present invention. FIG. 5 is a diagram showing a configuration of a third embodiment of the on-board communication device according to the present invention. FIG. 6 is a diagram showing a configuration of a fourth embodiment of the on-board communication device according to the present invention. FIG. 7 is a diagram illustrating a configuration in a case where a plurality of power wave transmitting antennas are also used as level monitor antennas in the on-board communication device according to the fourth embodiment. FIG. 8 is a diagram illustrating a configuration in a case where the resonance circuit switching unit according to the fourth embodiment is provided in an on-vehicle transceiver. FIG. 9 is a diagram showing the configuration of a fifth embodiment of the on-board communication device according to the present invention. FIG. 10 is a diagram illustrating the transmission output impedance characteristic of the series resonance circuit. FIG. 11 is a diagram illustrating a transmission output impedance characteristic when the resonance frequency is switched using a resonance capacitor and a resonance inductor.

  Hereinafter, as embodiments of the present invention, Examples 1 to 5 will be described in detail with reference to the drawings.

FIG. 1 is a diagram showing a configuration of a first embodiment of the on-board communication device according to the present invention.
As an example of the configuration employed by the on-board communication device according to the present invention, FIG. 1 shows an on-board transmitter / receiver 11 and an on-board child 1 used in a transponder transmission / reception system. The vehicle upper element 1 is constituted by, for example, a resonance circuit 18 that forms a series resonance circuit by a combination of the resonance circuit switching unit 13, the power wave transmission antenna 15, the information wave transmission / reception antenna 16 and the power wave transmission antenna 15. Among them, the resonance circuit 18 includes a resonance capacitor 14 and a resonance inductor 17, and is connected to the on-vehicle transmitter / receiver 11 via an outfitting wire (vehicle onboard connection cable) 12.

  As described above, the on-vehicle communication device can be applied to the vehicle element used in the transponder transmission / reception system. Therefore, the ATS-P (Automatic Train Stop-Pattern) using the transponder transmission / reception system and the ATO (automatic train stop system) are used. The present invention can be applied to a railway security system such as an automatic train operation (Automatic Train Operation) and a digital type ATC (Automatic Train Control).

Here, an example of an environment in which the on-board communication device according to the present invention is used will be described with reference to FIG.
FIG. 2 is a diagram illustrating a configuration of a system that transmits and receives train control information, information for driving support, and the like between the train 21 and the ground signal system using, for example, a transponder transmission / reception system.

  The vehicle upper element 1 mounted on the train 21 transmits and receives transmission / reception information from the vehicle transmitter / receiver 11 to and from the ground element 24 by electromagnetic waves, and communicates with the ground element 24 which is the ground side signal equipment. When the ground element 24 is a non-powered ground element that does not have its own power supply, it is necessary to wirelessly supply power for driving the ground element 24 from the train 21 in a non-contact manner. Hereinafter, this wirelessly transmitted power is referred to as a power wave. The power wave is an unmodulated signal having a constant frequency.

  The ground element 24 rectifies after receiving this unmodulated power wave, activates the circuit in its own ground element with the DC-converted power, and receives the power wave from the train 21 while the circuit is activated ( In other words, while the train is approaching the vicinity of the ground element), control information is transmitted to the vehicle upper element 1. Hereinafter, the electromagnetic waves of this control information are referred to as information waves. The control information is transmitted not only from the ground side but also from the vehicle side.

  Thus, in order to start the non-powered ground element, the train 21 needs to supply electric power via the vehicle element 1 mounted on itself. However, the signal frequency of this power wave differs depending on the section and the operator, and there are a plurality of frequencies. This is because, when a transponder transmission / reception system is introduced, the frequency of power waves to be used on the route is determined after considering frequencies that do not cause frequency interference with existing train radios and facilities along the line.

  Therefore, in order to drive a non-powered ground element in a train or the like that is interleaved with a plurality of routes, for example, as shown in FIG. 2, in a certain section 1, power is used as a power wave for driving the ground element 24. It is necessary to transmit the wave frequency f1, and in another section 2, it is necessary to transmit the power wave frequency f2 as a power wave for driving the ground unit 25.

  In order to transmit power waves efficiently, the power wave transmitting antenna 15 of the vehicle upper 1 forms an LC resonance circuit with L of the power wave transmitting antenna 15 and C of the capacitor, and resonates at one specified power wave frequency. The frequency is matched. Therefore, when the power wave frequencies to be transmitted are different between the section 1 and the section 2, the vehicle upper part dedicated to the section 1 having the resonance frequency f1 of the section 1 and the vehicle dedicated to the section 2 having the resonance frequency f2 of the section 2 respectively. It will be assumed that two installations of the upper child will be installed, and a sufficient installation space for the vehicle upper child cannot be secured. In the present invention, power waves having two different frequencies (here, f1 and f2) are configured to be transmitted by a single vehicle upper element 1.

Next, the configuration of the on-board communication device according to the first embodiment will be described in detail with reference to FIG.
The vehicle upper element 1 includes a resonance circuit switching unit 13, a resonance circuit 18 including a resonance capacitor 14 and a resonance inductor 17, a power wave transmission antenna 15, and an information wave transmission / reception antenna 16. Among them, the resonance circuit switching unit 13 includes a switch and a relay contact 131 for switching the connection of the resonance circuit 18, and a relay coil 132 for operating the switch and the relay contact 131. The switching command input 133 is supplied via the resonance circuit switching command signal line 123 of the outfitting wire 12. Further, the resonant circuit 18 has a frequency f1 resonant circuit 181 composed of a capacitor C1 141 for the frequency f1 and an inductor L1 171 for the frequency f1, and a frequency f2 for LC resonance with a plurality of different power wave frequencies. The frequency f2 resonant circuit 182 is composed of the capacitor C2 142 and the frequency f2 inductor L2 172.

  On the other hand, the on-vehicle transmitter / receiver 11 outputs, as input / output, the output of a resonance circuit switching command for the switching command input 133 to the resonance circuit switching unit 13, the input / output of the information wave signal to the information wave transmitting / receiving antenna 16, and the power wave transmitting antenna. 15 outputs a power wave signal. The on-vehicle transmitter / receiver 11 outputs, as a power wave transmission circuit, a power wave generation unit 111 that generates and outputs a power wave signal, a power wave frequency selection signal to be transmitted and a resonance circuit switching signal to the resonance circuit switching unit 13 A power wave frequency selection unit 114 that includes at least a power wave frequency oscillator 112 for generating a power wave frequency and a power wave amplifier for amplifying the power wave to a required level. 113. Further, the on-vehicle transceiver 11 is provided with a power wave monitor circuit 117 to monitor the output current of the power wave amplifier 113.

The on-board element 1 and the on-board transmitter / receiver 11 are connected to each other by a equipping line 12. The outfitting line 12 includes a power wave transmission line 121, an information wave transmission / reception line 122, and a resonance circuit switching command signal line 123.
The information wave transmission / reception antenna 16 is an antenna for transmitting / receiving data to / from the ground unit. In the configuration shown in FIG. 1, the transmission / reception frequency does not change depending on the section, and the configuration does not have a resonance circuit. Therefore, the resonance circuit switching unit 13 and the resonance circuit 18 are not shown. However, when the information wave is also resonated, the resonance frequency is obtained by configuring the resonance circuit switching unit 13 and the resonance circuit 18 similarly to the power wave. It is possible to switch between.

Next, the operation mode (resonant circuit switching procedure) of the on-board communication device according to the first embodiment will be described along the flow shown in FIG.
The power wave frequency selection unit 114 of the on-vehicle transmitter / receiver 11 selects whether to transmit the power wave frequency at f1 or f2 according to the line section or section where the train travels. In step 301, as a determination step for selecting the power wave frequency, it is determined whether the frequency to be transmitted is f2.

  When the frequency to be transmitted is f2 (YES), in step 302, the power wave frequency selection unit 114 stops applying the signal to the resonance circuit switching signal command line 123. By stopping the signal application, voltage application to the resonance circuit switching relay coil 132 of the resonance circuit switching unit 13 is stopped in step 303, so that the relay coil 132 is in a non-excited state.

  When the relay coil is de-energized, in step 304, the resonance circuit switching relay contact 131 of the resonance circuit switching unit 13 is deactivated. As a result, in step 305, the resonance circuit LC2 182 for the frequency f2 is connected to the power wave transmission antenna 15, and the other resonance circuit LC1 181 for the frequency f1 is disconnected from the power wave transmission antenna 15.

  Therefore, an LC series resonance circuit having a resonance frequency f2 is configured by the inductance of the power wave transmission antenna 15, the capacitance of the resonance capacitor C2 142 for f2, and the inductance of the resonance inductor L2 172 for f2, thereby minimizing the transmission output impedance for the frequency f2. Thus, the power wave transmitting antenna 15 sends a necessary and sufficient amount of power to the ground device.

  In step 306, the power wave frequency selection unit 114 sets the frequency f <b> 2 in the power wave generation unit 111, and the on-vehicle transmitter / receiver 11 inputs the power wave of the frequency f <b> 2 to the on-board child 1. Through the above steps, in step 307, the power wave transmitting antenna 15 transmits the power wave having the frequency f2. Note that after step 306 is performed first, step 302 and the subsequent steps may be performed.

  On the other hand, when the line section or section in which the train travels changes and the frequency to be transmitted is f1, the determination result in the determination step of step 301 is NO. In step 308, the power wave frequency selection unit 114 of the on-vehicle transceiver 11 applies a command signal to the resonance circuit switching signal command line 123. By applying this command signal, in step 309, the relay coil driving voltage is applied to the resonance circuit switching relay coil 132 of the resonance circuit switching unit 13, and the relay coil 132 is excited.

  When the relay coil is energized, the resonance circuit switching relay contact 131 of the resonance circuit switching unit 13 is activated in step 310. As a result, in step 311, the resonance circuit LC1 181 for frequency f1 is connected to the power wave transmission antenna 15, and the other resonance circuit LC2 182 for frequency f2 is disconnected from the power wave transmission antenna 15.

  Therefore, an LC series resonance circuit having a resonance frequency f1 is configured by the inductance of the power wave transmitting antenna 15, the capacitance of the resonance capacitor C1 141 for f1, and the inductance of the resonance inductor L1 171 for f1, and the transmission output impedance for the frequency f1 is minimized. Thus, the power wave transmitting antenna 15 sends a necessary and sufficient amount of power to the ground device.

  In step 312, the power wave frequency selection unit 114 sets the frequency f1 in the power wave generation unit 111, and the on-vehicle transmitter / receiver 11 inputs the power wave of the frequency f1 to the on-board child 1. Through the above steps, in step 313, the power wave having the frequency f1 is transmitted from the power wave transmitting antenna 15. Note that after step 312 is performed first, step 308 and subsequent steps may be performed.

  As described above, in the first embodiment, only the LC resonance circuit is switched, and the power wave transmission antenna 15 uses the same antenna before and after switching. In other words, the number of antenna turns and the L value do not change before and after switching of the LC resonance circuit. Therefore, the power wave transmitting antenna 15 is used when the f1 resonance circuit LC1 181 is connected to transmit a power wave of the frequency f1, and when the f2 resonance circuit LC2 182 is connected to transmit the power wave of the frequency f2. Therefore, only the resonance frequency is shifted.

  Thus, since there is no change in the number of turns of the antenna, the current value per one turn of the power wave transmitting antenna 15 when transmitting the necessary amount of power to the ground does not change before and after switching of the resonance circuit. . Further, when the power wave current is monitored by the power wave monitor circuit 117 and the failure detection due to the transmission level control or the level drop is performed, the target value and the failure determination threshold value monitored before and after switching of the resonance circuit may be the same. it can.

  Further, by switching the resonance frequency using a resonance capacitor and a resonance inductor, the resonance frequency setting of the vehicle upper element 1 is set by the power wave generation unit 111 due to disconnection of the resonance circuit switching command signal line 123 or failure of the resonance circuit switching unit 13. When an abnormality that is inconsistent with the output frequency (frequency setting abnormality) occurs, the power wave current monitored by the power wave monitor circuit 117 can be significantly reduced. Can be detected. Hereinafter, the principle of the abnormality detection will be described.

FIG. 10 is a diagram illustrating the transmission output impedance characteristic of the series resonance circuit.
When considering a series resonance circuit of the power wave transmitting antenna 15 and the resonant capacitor C2 142, the inductive reactance XL 201 due to the inductance of the power wave transmitting antenna 15 is dominant in the high frequency band, and in the low frequency band, the resonance is generated. The capacitive reactance XC2 203 due to the capacitance of the capacitor C2 142 is dominant. The frequency at which the sum of these reactances becomes zero is the resonance frequency f2 of this series resonance circuit, and the transmission output impedance characteristic is “Z2 205” in FIG.

  Here, the impedance Zres 206 of the series resonance circuit at the resonance frequency f2 is an equivalent series resistance value due to copper loss, iron loss, radiation loss, etc. on the circuit, and the resonance frequency is switched by changing the LC of the circuit. The value of Zres 206 is almost unchanged.

  The operation when the resonance frequency is switched from f2 to f1 using only the resonance capacitor 14 will be described with reference to FIG. Here, it is assumed that f2 is larger than f1. Since the resonance frequency is inversely proportional to the square root of the product of the inductance and the capacitance, it is necessary to increase the product of the inductance and the capacitance in order to reduce the resonance frequency from f2 to f1. Here, since the inductance of the power wave transmitting antenna is constant, the capacitance of the resonant capacitor is increased. Increasing the capacitance of the resonant capacitor 14 from C2 142 to C1 141 reduces the capacitive reactance from XC2 203 to XC1 202. On the other hand, since the inductance of the power wave transmitting antenna 15 does not change, the inductive reactance XL 201 does not change. As a result, the transmission output impedance characteristic is Z1 204 in FIG.

  At this time, if a frequency setting abnormality in which the power wave generation unit 111 outputs a power wave with the frequency f2 occurs, the transmission output impedance becomes Zerr 207 in FIG. Since Zerr 207 is larger than Zres 206, the power wave current at the time of abnormal output of the power wave of frequency f2 is smaller than that at normal time when the power wave generation unit 111 outputs the power wave of frequency f1. By utilizing this, a threshold value is set between the abnormal current and the normal current, and it can be determined that the power wave current monitored by the power wave monitor circuit 117 is normal if it is higher than the threshold, and abnormal if it is low. .

  However, in reality, the power wave current varies due to variations in the antenna resonance frequencies f1 and f2, gain variations in the power wave amplifier 113, variations in accuracy in the power wave monitor circuit 117, and the like. Therefore, the Zerr 207 and the Zres 206 The difference between the normal current and the abnormal current becomes small, which makes it difficult to detect the difference.

  In contrast, in the configuration of the on-board communication device (series resonance circuit) according to the present invention, the operation mode when the resonance frequency is switched from f2 to f1 by the resonance capacitor 14 and the resonance inductor 17 shown in FIG. It explains using.

  In the series resonance circuit shown in FIG. 1, for switching the resonance frequency, the capacitance of the resonance capacitor 14 is increased from C2 142 to C1 141 to reduce the capacitive reactance from XC2 203 to XC1 202, and the resonance inductor 17 The inductance is increased from L2 172 to L1 171 and the inductive reactance is increased from XL2 212 to XL1 211.

  As a result, the transmission output impedance characteristic of the series resonant circuit is Z1A 213 in FIG. At this time, if a frequency setting abnormality in which the power wave generation unit 111 outputs a power wave with the frequency f2 occurs, the transmission output impedance becomes ZerrA 214 in FIG. Since the inductive reactance is increased by the resonant inductor 17, ZerrA 214 becomes higher than Zerr 207 in FIG. 10, and the difference in power wave current between when the frequency setting is abnormal and when it is normal increases. As a result, the power wave monitor circuit 117 can detect the difference between both current values when the frequency setting is abnormal and when the frequency setting is normal, with a margin, and can reliably detect the frequency setting abnormality.

The capacitance C1 141 of the resonance capacitor 14 and the inductance L1 171 of the resonance inductor 17 are expressed by the following equations using the inductance L of the power wave transmission antenna 15 and the resonance frequency f1.

  That is, the values of L1 and C1 can be arbitrarily set within a range that satisfies the above expression. As L1 is larger and C1 is smaller, the transmission output impedance in the frequency band other than the resonance frequency becomes higher, so the power wave current when the frequency setting is abnormal is further reduced. For this reason, even if the above-described variation factors are taken into consideration, it is possible to set the LC value to a value that can sufficiently reduce the power wave current when the frequency setting is abnormal.

  Further, the power wave frequency selection unit 114 shown in FIG. 1 is a power wave frequency selection condition input from a device outside the on-vehicle transceiver 11 such as the operation section switching SW (switch) 22 or the train control unit 23 shown in FIG. Accordingly, a transmission frequency selection command for the power wave frequency oscillator 112 and a resonance circuit switching command signal for the relay coil 132 of the resonance circuit switching unit 13 are output.

  put it here. As shown in FIG. 1, the power wave frequency oscillator 112 includes a sine wave computing element 115 that computes a sine wave having an arbitrary frequency that matches the power wave frequency, and a DA converter 116 that outputs the computed sine wave as an analog signal. Prepare. The sine wave calculation element 115 can be configured by an element capable of numerical calculation such as a microcomputer, a CPU, a DSP, and an FPGA. Further, the sine wave arithmetic element 115 and the DA converter 116 can be configured by a DDS (Direct Digital Synthesizer).

  In response to the command output from the power wave frequency selection unit 114, the power wave frequency oscillator 112 switches the frequency of the sine wave generated by the sine wave calculation element 115, thereby generating an oscillator that can output any plurality of frequencies. In the first embodiment, both frequencies f1 and f2 can be output. The output from the power wave frequency oscillator 112 is amplified to the power wave transmission level by the power wave amplifier 113 and then input to the LC series resonance circuit of the vehicle upper element 1 via the power wave transmission line 121. Further, the output of the power wave amplifier 113 may be input to the vehicle upper element 1 after removing noise through a filter as necessary. In the on-vehicle transmitter / receiver 11, the circuit unit that processes the information wave transmitted / received via the information wave transmission / reception line 122 is omitted because it is not directly related to the gist of the present invention.

As described above, a set of power can be obtained by inputting the frequency selection command of the power wave frequency selection unit 114 to the power wave frequency oscillator 112 and by switching the power wave frequency oscillator 112 so that a plurality of frequencies can be output. The wave generator 111 can generate power waves having two different frequencies, f1 and f2. Therefore, not only the conventional two sets of power wave frequency oscillators and power wave amplifiers (shown in, for example, Patent Document 1) can be reduced to one set of power wave frequency oscillators and power wave amplifiers, but also a power wave transmission switching circuit can be provided. It is also possible to reduce the circuit mounting area and the manufacturing cost associated therewith.
In the first embodiment, the inductance L2 is clearly shown. However, when the antenna inductance L is sufficient, it is needless to say that the inductance L2 can be set to 0 (short).

FIG. 4 is a diagram showing a configuration of a second embodiment of the on-board communication device according to the present invention.
The second embodiment is characterized in that the resonance circuit switching unit 13 is configured inside the on-vehicle transmitter / receiver 11 instead of inside the on-board child 1 as in the first embodiment. As shown in FIG. 4, even if the resonance circuit switching unit 13 is configured inside the on-vehicle transceiver 11, the resonance circuit 18 can be switched and there is no problem in terms of function. In general, the interior of the vehicle upper body 1 has a structure that cannot be disassembled because it is resin-molded for waterproofing and vibration resistance. Therefore, when the resonance circuit switching unit 13 is configured inside the vehicle upper arm 1, maintenance of a mechanical drive unit such as a relay becomes a problem. However, by configuring the resonance circuit switching unit 13 inside the on-vehicle transmitter / receiver 11, the maintenance of the mechanical drive unit can be improved and the operation reliability can be increased. In the on-vehicle transmitter / receiver 11, the circuit unit that processes the information wave transmitted / received via the information wave transmission / reception line 122 is omitted as in the first embodiment.

FIG. 5 is a diagram showing a configuration of a third embodiment of the on-board communication device according to the present invention.
The third embodiment is characterized in that the vehicle upper element 1 shares the resonance capacitor and the resonance inductor in the resonance circuit for a plurality of resonance frequencies. Since the configuration of the information wave transmitting / receiving antenna 16 is the same as that of the first embodiment, its illustration is omitted.

  The vehicle upper element 1 includes a resonance circuit switching unit 51, a resonance capacitor C3 54, a resonance capacitor C4 55, a resonance inductor L3 56, a resonance inductor L4 57, a power wave transmitting antenna 15, and an information wave transmitting / receiving antenna 16 (not shown).

  Among them, the resonance circuit switching unit 51 is a switch or relay contact A52 for connecting the resonance capacitor C4 55 in parallel to the resonance capacitor C3 54, and for connecting the resonance inductor L4 57 in parallel to the resonance inductor L3 56. The switch or relay contact B59, and the switch or relay contact A52 and the relay coil for operating the switch or relay contact B59.

  The switch or relay contact A52 is a normally open contact (a contact), and both ends are connected when the frequency f1 is set, and both ends are released when the frequency f2 is set. On the other hand, the switch or relay contact B59 is a normally closed contact (b contact), and both ends are opened when the frequency f1 is set, and both ends are connected when the frequency f2 is set. Neither switch or relay contacts A52 and B59 prevent the resonant capacitor C3 54, the resonant inductor L3 56 and the power wave transmitting antenna 15 from being connected in series. Here, the relationship between the frequency f1 and the frequency f2 is f2> f1.

  When transmitting at the frequency f1, a resonant circuit is formed by the parallel combined capacitance of the resonant capacitors C3 54 and C4 55 and the resonant inductor L3 56, and when transmitting at the frequency f2, the parallel combined inductance of the resonant inductors L3 56 and L4 57 is A resonance circuit is formed with the resonance capacitor C354. As a result, the resonance circuit having the frequencies f1 and f2 is configured to share the resonance capacitor C3 and the resonance inductor L3.

  By the way, when considering the component sizes of the capacitor and the inductor, the component size tends to increase as the capacitance of the capacitor increases and the allowable current value of the inductor increases. Therefore, the capacitance of the resonance capacitor C3 is set large and the capacitance of the resonance capacitor C4 is set small. Also, the inductance of the resonant inductor L3 is set to be small (that is, the current during power wave transmission is increased), and the inductance of the resonant inductor L4 is set to be large. Thereby, compared with the resonant capacitor C2 and the resonant inductor L2 of the first embodiment, the component size of the resonant capacitor C4 and the resonant inductor L4 of the third embodiment can be reduced and the cost can be reduced.

  As a matter of course, a normally closed contact (b contact) is used as the relay contact 52 instead of a normally open contact (a contact), and a normally open contact (a contact) is used as the relay contact 59 instead of a normally closed contact (b contact). Is used so that the resonance capacitors C3 54 and C4 55 and the resonance inductor L3 56 can resonate at the frequency f1 when application of the command signal to the relay coil is stopped, and when the command signal is applied to the relay coil, the resonance capacitor C3 54 and resonant inductors L3 56 and L4 57 may be configured to resonate at frequency f2.

  Further, in the third embodiment, the inductance L4 is used as a substance, but when the antenna inductance L is sufficient, it can be dealt with by simply short-circuiting the inductance L3 by the relay contact 59 without using the inductance L4. Needless to say.

FIG. 6 is a diagram showing a configuration of a fourth embodiment of the on-board communication device according to the present invention.
In the fourth embodiment, in place of the power wave transmitting antenna 15 of the first embodiment, the power wave transmitting antenna A62 always connected to the resonance circuit LC1 181 for the frequency f1 and the power wave always connected to the resonance circuit LC2 182 for the frequency f2. It is characterized by using two antennas of the transmission antenna B63. In the fourth embodiment as well, the information wave transmitting / receiving antenna is not shown. When the resonance circuit switching unit 61 selects the resonance circuit LC1 181 for f1, a power wave is transmitted using the power wave transmission antenna A62, and when the resonance circuit LC2 182 for f2 is selected, the power wave transmission antenna B63. Is used to transmit a power wave.

As in the fourth embodiment, it is possible to realize an on-vehicle communication device that supports a plurality of power wave transmissions with different frequencies even when the power wave transmission antennas are provided according to the power wave frequency to be transmitted. .
Further, by providing a plurality of power wave transmission antennas, the antenna that is not used for power wave transmission can be used as a monitor antenna for monitoring the power wave transmission level.

FIG. 7 is a diagram illustrating a configuration in a case where a plurality of power wave transmitting antennas are also used as level monitor antennas in the on-board communication device according to the fourth embodiment.
When transmitting at the frequency f1, the power wave transmitting antenna B63, which is an antenna not used for power wave transmission, is used as a monitor antenna for monitoring the output of the power wave transmitting antenna A62. On the other hand, at the time of transmission at frequency f2, power wave transmission antenna A62, which is an antenna not used for power wave transmission, is used as a monitor antenna for monitoring the output of power wave transmission antenna B63.

  Specifically, when transmitting at the frequency f1, the power wave transmission line 121 is connected to the power wave transmission antenna A62 and not connected to the power wave transmission antenna B63. Accordingly, the power wave transmission level monitor line 72 is connected to the power wave transmission antenna B63 and is not connected to the power wave transmission antenna A62. As a result, a part of the power wave having the frequency f1 transmitted from the power wave transmitting antenna A62 is received by the power wave transmitting antenna B63, and the reception level is fed back to the onboard transceiver 11 so that the onboard transceiver 11 Thus, it is possible to monitor the level of power wave transmission from the power wave transmission antenna A62. At this time, the terminal resistor 73 of the power wave transmission level monitor line 72 is connected to a high impedance so that only a small amount of power necessary for monitoring the transmission level is distributed to the power wave transmission level monitor line 72. Thereby, level monitoring becomes possible without impairing the power level of the power wave transmitted to the ground unit.

  Next, FIG. 8 is a diagram illustrating a configuration when the resonance circuit switching unit 61 according to the fourth embodiment is provided inside the on-vehicle transceiver 11. With this configuration, as described in the second embodiment, it is possible to improve the maintainability of the mechanical drive unit and increase the operation reliability.

  Also in the fourth embodiment, the power wave transmitting antenna A62 and the power wave transmitting antenna B63 are antennas having the same fixed number of turns, so that the number of antenna turns does not change before and after switching of the resonance circuit. It is possible to make the same before and after the circuit switching. However, it is not excluded that the power wave transmission antenna A62 and the power wave transmission antenna B63 are configured with different numbers of turns, and of course it is possible.

FIG. 9 is a diagram showing the configuration of a fifth embodiment of the on-board communication device according to the present invention. However, FIG. 9 shows only the configuration of the vehicle upper element 1, and the vehicle transmitter / receiver 11 is omitted together with the information wave transmitting / receiving antenna 16 as in the first embodiment.
The fifth embodiment is characterized in that relay contacts are arranged at both ends of the resonance circuit. That is, as the resonance circuit switching unit 91, a relay contact 93 on the input side and a relay contact 94 on the output side are provided at both ends of the resonance circuit, as viewed from the on-vehicle transceiver 11 (not shown). The two relay contacts 93 and 94 are simultaneously operated by a resonance circuit switching command applied to the relay coil 92.

  By providing the relay contact at both ends of the resonance circuit, when switching the resonance circuit, the connection to the power wave transmitting antenna 15 is disconnected at both ends of the resonance circuit, so that the voltage applied to both ends of the relay contact can be reduced. In the first to fourth embodiments, the configuration in which only one end of the resonance circuit is separated from the power wave transmitting antenna 15 is shown. However, in the first to fourth embodiments as well, the both ends of the resonance circuit are the same as in the fifth embodiment. Can be connected and disconnected.

Next, with reference to FIG. 2, an application example using the on-board communication device according to the first to fifth embodiments will be described.
In section 1, when the ground element 24 is a non-powered ground element, the on-vehicle transmitter / receiver 11 transmits a power wave having a frequency f <b> 1 to the vehicle element 1 in order to drive the ground element 24. At this time, as shown in the first to fifth embodiments, the vehicle upper unit 1 selects an LC resonance circuit corresponding to the frequency f1, and transmits a power wave having the frequency f1 to the ground.

The following method can be considered as a method (condition) for the on-vehicle transceiver 11 to transmit the frequency f1.
1) A method for capturing the selected state of the operation section switching SW 22 (switch) provided in the driver's cab into the power wave frequency selection unit 114 of the on-vehicle transceiver 11 2) Other devices connected to the on-vehicle transceiver 11 (for example, 3) A method for receiving frequency selection information from a train control unit 23 including a safety device such as ATC, ATS, etc.) by the power wave frequency selection unit 114 of the on-vehicle transceiver 11 and selecting the frequency f1. Data indicating the frequency of the power wave required in each section is stored inside the ground unit 25, bit information indicating the frequency selection of the power wave is provided in the communication information with the ground unit, and the on-vehicle transceiver 11 is a method in which the power wave frequency selection unit 114 selects the frequency f1 based on information received from the ground unit. 4) Self-estimates the travel section using a pulse counter or the like, and the power wave frequency of the on-vehicle transceiver 11 How to select the frequency f1 by the selection unit 114

  Among the above methods, in the case of the method in which the frequency f1 is selected by the power wave frequency selection unit 114 from the information received from the ground unit, the information from the ground unit is not required even if the ground unit is not activated by the power wave. Bit information indicating power wave frequency selection is provided in the communication information with the receivable power source ground element, and the frequency f1 is selected by the power wave frequency selection unit 114 from the information received by the on-vehicle transceiver 11 from the ground element 24. Bit information indicating power wave frequency selection is provided in the communication information with the non-powered ground element that is activated at a power wave frequency other than f1 that is transmitted before entering section 1 Either of the methods in which the upper transmitter / receiver 11 selects the frequency f1 by the power wave frequency selection unit 114 based on the reception information from the ground unit 24 can be implemented.

  When the train enters section 2, information for selecting the power wave frequency f2 corresponding to the non-powered ground element 25 used in section 2 is sent to on-vehicle transceiver 11 by the method described in 1) to 4) above. The on-vehicle transmitter / receiver 11 is set and transmits a power wave having a frequency f2 to the on-vehicle child 1. As shown in the first to fifth embodiments, an LC resonance circuit corresponding to the frequency f2 is selected from the vehicle upper 1, and a power wave having the frequency f2 is transmitted from the vehicle upper to the ground.

  With the above configuration and method, even in a train that travels in a plurality of traveling sections having different power wave frequencies for driving the ground unit, a power wave having a plurality of frequencies is transmitted according to the traveling section, and between the ground and the vehicle Communication can be carried out by a single vehicle child.

  In the first to fifth embodiments, the switching of the power wave frequency in the transponder transmission / reception system and the switching of the resonance circuit according to the frequency have been described. Of course, the present invention transmits a plurality of signal frequencies, The present invention can be applied to various systems that use a plurality of resonance circuits corresponding to a certain frequency.

  In the first to fifth embodiments, the resonance circuit corresponding to two different signal frequencies is switched as an example. However, the on-board communication device according to the present invention is applicable to three or more different signal frequencies. However, it is also possible to transmit a power wave having three or more resonance frequencies by switching the resonance circuit provided in accordance with them. In that case, in the fourth embodiment, three or more power wave transmitting antennas may be provided corresponding to three or more different signal frequencies.

  As described above, according to the on-board communication device according to the present invention, a plurality of frequencies having different frequencies without changing the number of windings of the power wave transmitting antenna between f1 transmission and f2 transmission as the power wave frequency. It is possible to switch a plurality of resonance circuits corresponding to the power wave. Thereby, since the number of turns of the antenna is not changed, when the power wave transmitting antenna 15 transmits a necessary amount of power to the ground, the current value per one turn of the antenna does not change before and after switching of the resonance circuit. . Therefore, when the antenna current is monitored to perform transmission level control or level failure detection, the target value and the failure determination threshold monitored before and after switching of the resonance circuit can be kept the same. Further, since the number of turns of the antenna is a fixed number of turns, it is possible to simplify the structure of the antenna and reduce the cost of the apparatus without having an intermediate tap.

  In addition, according to the present invention, since the transmission frequency of the power wave frequency oscillator can be switched, two sets of power wave frequency oscillators and power wave amplifiers are required for power wave frequency f1 transmission and frequency f2 transmission. In addition, it is possible to provide an on-vehicle communication device capable of transmitting a plurality of power waves having different frequencies with only one set of power wave frequency oscillator and power wave amplifier. Therefore, according to the present invention, not only can the two sets of power wave frequency oscillators and power wave amplifiers disclosed in Patent Document 1 be reduced to one set of power wave frequency oscillators and power wave amplifiers, but also the power wave transmission switching circuit can be eliminated. It becomes possible. Therefore, it is possible to reduce the manufacturing cost by reducing the circuit mounting area and the mounting parts.

  In addition, this invention is not limited to the Example mentioned above, Various modifications are included. For example, each of the above-described embodiments has been described in detail for easy understanding of the present invention, but is not necessarily limited to the one having all the configurations described. It is also possible to replace a part of the configuration of one embodiment with the configuration of another embodiment, or to add the configuration of another embodiment to the configuration of one embodiment. Furthermore, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

1 on-board child, 11 on-board transceiver, 111 power wave generator,
112 power wave frequency oscillator, 113 power wave amplifier, 114 power wave frequency selection unit,
115 sine wave arithmetic element, 116 DA converter, 117 power wave monitor circuit,
12 outfitting lines, 121 power wave transmission lines, 122 information wave transmission / reception lines,
123 resonance circuit switching command signal line, 13, 51, 61, 71, 91 resonance circuit switching unit,
131 relay contact, 92, 132 relay coil, 133 switching command input,
14, 53 resonance capacitor, 141 resonance capacitor C1 for frequency f1,
142 resonant capacitor C2 for frequency f2, 15 power wave transmitting antenna,
16 information wave transmitting / receiving antenna, 17, 56 resonant inductor,
171 Resonant inductor L1 for frequency f1, 172 Resonant inductor L2 for frequency f2,
18 resonant circuit, 181 resonant circuit LC1 for frequency f1,
182 resonant circuit for frequency f2, LC2, 21 train,
22 operation section switching SW (switch), 23 train control unit, 24, 25 ground unit,
52 Relay contact A, 54 Capacitor C3, 55 Capacitor C4,
57 Inductor L3, 58 Inductor L4, 59 Relay contact B,
62 power wave transmitting antenna A, 63 power wave transmitting antenna B,
72 power wave transmission level monitor line, 73 termination resistor, 93 relay contact (input side),
94 Relay contact (output side)

Claims (10)

An on-vehicle communication device mounted on a vehicle,
A power wave transmitting antenna having a fixed number of turns and transmitting a power wave to the ground unit;
A group of resonant circuits configured by connecting two or more series circuits from two or more resonant capacitors and two or more resonant inductances to the power wave transmitting antenna;
A switching unit that selects and switches any one of the two or more series circuits based on a switching command; and
A frequency selection unit that outputs the switching command and selects, as the frequency of the power wave, a frequency that matches a resonance frequency determined by any one of the series circuits switched based on the switching command and the power wave transmitting antenna; ,
An on-vehicle communication device comprising: a power wave generation unit that outputs the power wave of the frequency selected by the frequency selection unit. The on-vehicle communication device according to claim 1,
Equipped with a car upper,
The on-vehicle communication device, wherein the vehicle upper element includes the power wave transmission antenna and the resonance circuit group, or includes the power wave transmission antenna, the resonance circuit group, and the switching unit. The on-vehicle communication device according to claim 1 or 2,
The on-board communication device, wherein the resonance circuit group is configured by providing two or more series circuits each including any one of the resonance capacitors and any one of the resonance inductances in parallel. The on-vehicle communication device according to claim 3,
The power wave transmitting antenna is composed of two or more antennas,
The on-vehicle communication device characterized in that the series circuit provided in parallel and the power wave transmitting antenna are connected in association with each other. The on-vehicle communication device according to claim 4,
Any one of the power wave transmitting antennas that is not used to transmit the power wave monitors a transmission state of the power wave transmitted from the antenna that transmits the power wave. On-vehicle communication device. The on-vehicle communication device according to claim 1 or 2,
The resonance circuit group is configured to always connect a series circuit including a specific resonance capacitor and a resonance inductance from the resonance capacitor and the resonance inductance to the power wave transmitting antenna, and switch the switching unit to the specific resonance capacitor. An on-vehicle communication device having a configuration in which the resonance capacitors other than the resonance capacitor are connected in parallel and the resonance inductances other than the resonance inductance are connected in parallel to the specific resonance inductance. The on-vehicle communication device according to any one of claims 1 to 6,
The on-vehicle communication characterized in that the switching unit includes a relay contact that selectively disconnects or connects the two or more series circuits and a relay coil that drives the relay contact based on the switching command. apparatus. The on-vehicle communication device according to any one of claims 1 to 5,
The switching unit includes a relay contact that selectively disconnects or connects both ends of the two or more series circuits, and a relay coil that drives the relay contact based on the switching command. On-vehicle communication device.   A vehicle equipped with the on-board communication device according to claim 1. A vehicle communication system comprising the on-board communication device according to any one of claims 1 to 8,
The ground unit is installed along a traveling path of the vehicle, and transmits an information wave signal including information indicating a frequency of the power wave corresponding to a section in which the ground unit is installed to the vehicle.
The on-board communication device includes an information wave transmission / reception antenna that receives the information wave signal and transmits another information wave signal itself, and when receiving information indicating the frequency of the power wave from the ground unit, The vehicle communication system, wherein the frequency selection unit outputs the switching command according to information indicating the frequency of the power wave and selects the frequency of the power wave.

Images