JP5879237B2 - Moving body position detection device and wireless power transmission device - Google Patents

Description

  The present invention relates to a failure detection system, and more particularly, to a failure detection system suitable for a mobile body position detection apparatus that performs control such as speed control of a mobile body.

  A ground communication device that transmits position information and the like arranged on the path of the mobile body, an on-vehicle communication device that supplies power to the ground communication device and receives position information from the ground communication device, and receives the information and brakes It is comprised by the on-board apparatus etc. which control etc. A general ground communication device is a non-power supply device, which operates based on a power signal transmitted from an on-board communication device attached to a vehicle body, or a signal stored in advance in a memory inside the device or an external signal device. It is a device capable of transmitting a signal that is constantly input to the on-board communication device. The transmission / reception signal between the two is realized by using two different frequency bands, and the on-board communication device and the ground communication device must adapt to this.

In other words, a communication device used in a mobile system that requires reliability is a function that can constantly monitor the operation status of a transmission / reception system that operates in each frequency band of transmission and reception, and can detect failures due to aging degradation of equipment, etc. It is desirable to have
As an example having a failure detection function, in the ground communication device with a self-diagnosis function disclosed in Patent Document 1, the resonance frequency or output power of the resonance circuit included in the ground communication device is constantly monitored by the built-in self-diagnosis circuit. , It has a structure that automatically outputs a failure detection signal of the ground communication device to the outside when one of them falls below the reference value.

In addition, as a publicly known example having input / output monitoring and failure detection functions, a sensor coil is formed on the same surface inside the transmission antenna, as in the non-contact type IC card reader / writer device of Patent Document 2, There has been proposed a method for recognizing an influence such as a decrease in communication sensitivity by detecting a change in the amount of magnetic flux generated by the transmitting antenna and comparing it with a predetermined value.
Further, like a communication terminal device equipped with a plurality of radio devices shown in Patent Document 3, an arbitrary radio device transmits a test signal to the other radio device, and the demodulation result is valid. A method of confirming that there is no problem in the modulation / demodulation system of the radio has also been proposed.

JP 2002-37071 A JP 2003-256784 A JP 2010-87786 A

  When applying the prior art described in Patent Document 1 as a failure detection function for an on-vehicle device including an on-vehicle communication device, the following configuration is conceivable. First, a frequency sweep signal including a system-defined frequency is continuously applied to a loop antenna that is a target of failure detection, and a response signal at a frequency that maximizes the response of the loop antenna is detected. Next, the response signal is passed through an amplifier that selectively amplifies only the system-defined frequency, and compared with a predetermined reference voltage value, so that the resonance frequency deviation of the loop antenna or the output power is reduced. It becomes possible to detect.

However, this method can deal only with the failure detection of the loop antenna, and cannot monitor the failure of the transmission power amplifier included in the on-board device and whether the reception circuit is operating normally. Further, since a circuit for generating a frequency sweep signal is required for each apparatus, it is not useful from the viewpoint of cost.
When a failure such as a resonance frequency shift of the loop antenna occurs, mismatch due to a change in input impedance is also caused at the same time. For this reason, a failure can be detected only by monitoring the reflected wave at the input / output end of the loop antenna.

When applying the prior art described in Patent Document 2 as a failure detection function, a sensor coil is formed on the same surface inside the loop antenna that is the target of failure detection, and the change in the amount of magnetic flux is monitored and compared with a predetermined value. Thus, a decrease in transmission power from the loop antenna can be detected.
In this case as well, it cannot be used to detect a failure of the transmission system power amplifier or the reception system circuit as in the above example. In general, the ground communication device and the on-board device are often connected by a cable of about 10 to 30 m. Therefore, a weak signal transmitted between the ground communication device and the on-board device has a level due to the attenuation in the cable and the influence of external noise. Not stable. Therefore, there is a case where the on-board device cannot take a signal level detection accuracy sufficient for detecting a failure.

When applying the conventional technique described in Patent Document 3 as a failure detection function, two systems of ground communication devices and on-vehicle devices are provided, and a test signal is transmitted from an arbitrary device to the other device at a system-defined reception frequency. The normality of each receiving system can be confirmed by determining whether the demodulation is normally performed.
However, in order to realize the above method, a circulator or the like that separates transmission / reception signals is required in addition to a circuit that transmits a test signal in a system-specified reception frequency band in a reception system circuit. Further, transmission / reception signals having the same frequency and the same modulation method are mixed on the same transmission line, and the test accuracy and the detection accuracy of the desired received signal are lowered. Furthermore, considering that the directivity in the horizontal direction of the loop antenna is extremely weak, it is difficult to realize a failure detection function between the two loop antennas.

In consideration of the above-mentioned problems of the prior art, it is desirable to develop a technique for mobile systems, in particular, to further enhance performance monitoring of the vehicle upper side device and to easily identify the failure location when a failure occurs. .
In view of the above situation, an object of the present invention is to provide a failure detection system capable of constantly monitoring the performance of both transmission and reception systems, particularly suitable for a mobile body position detection device that performs control such as speed control of a mobile body. It is in.

In order to achieve the above object, the present invention is a mobile body position detecting device including an on-vehicle communication device having a communication antenna for communicating with a ground communication device provided on the ground,
A power amplifier that amplifies a power wave signal to be transmitted to the ground communication device;
Supplying the traveling wave of the power wave signal supplied from the power amplifier to the communication antenna of the on-board communication device, branching a part of the traveling wave of the power wave signal, and supplying the power supplied to the communication antenna; A directional coupler for branching a part of the reflected wave of the wave signal;
A receiving circuit for processing a received signal received by a communication antenna of the on-board communication device, including a signal transmitted from the ground communication device;
A traveling wave and a reflected wave of the power wave signal partially branched by the directional coupler and a reception signal processed by the receiving circuit are supplied, and based on these, a communication operation of the mobile body position detecting device An input / output state monitoring unit for monitoring
A test signal generation circuit for monitoring the operation of the receiving circuit based on an instruction from the input / output state monitoring unit;
A test signal transmission antenna that is supplied with the test signal generated by the test signal generation circuit and transmits the test signal to a communication antenna of the on-board communication device;
The input / output state monitoring unit includes:
The operation of the power amplifier is monitored based on the traveling wave of the power wave signal partially branched by the supplied directional coupler, and the power partially branched by the supplied directional coupler The on-board communication device monitors the operation of the communication antenna of the on-vehicle communication device based on the traveling wave and the reflected wave of the wave signal, and includes the receiving circuit based on the test signal processed by the supplied receiving circuit It is characterized by having a failure detection system that monitors the operation of the system.

Further, the present invention is a wireless power transmission device including a power transmission device having a communication antenna that communicates with a power receiving device that receives power supply,
A power amplifier that amplifies a power wave signal for transmission to the power receiving device;
The traveling wave of the power wave signal supplied from the power amplifier is supplied to the communication antenna of the power transmission device, a part of the traveling wave of the power wave signal is branched, and the power wave signal supplied to the communication antenna A directional coupler for branching a part of the reflected wave of
A reception circuit for processing a reception signal received by a communication antenna of the power transmission device including a signal transmitted from the power reception device;
A traveling wave and a reflected wave of the power wave signal partially branched by the directional coupler and a reception signal processed by the receiving circuit are supplied, and based on these, a communication operation of the mobile body position detecting device An input / output state monitoring unit for monitoring
A test signal generation circuit for monitoring the operation of the receiving circuit based on an instruction from the input / output state monitoring unit;
A test signal transmission antenna that is supplied with the test signal generated by the test signal generation circuit and transmits the test signal to a communication antenna of the charging device;
The input / output state monitoring unit includes:
The operation of the power amplifier is monitored based on the traveling wave of the power wave signal partially branched by the supplied directional coupler, and the power partially branched by the supplied directional coupler The operation of the communication antenna of the on-board communication device is monitored based on the traveling wave and the reflected wave of the wave signal, and the operation of the reception system including the reception circuit is monitored based on the test signal processed by the supplied reception circuit. A failure detection system is provided.

  ADVANTAGE OF THE INVENTION According to this invention, the failure detection system suitable for the mobile body position detection apparatus which performs control, such as speed control of a mobile body, can be provided, and there exists an effect that safety can be improved further.

1 is an overall configuration diagram of an automatic moving body control device or an automatic moving body driving device in the present embodiment. 1 is a partial configuration diagram of a failure detection system according to an embodiment described in Example 1. FIG. It is a partial block diagram of the failure detection system which concerns on embodiment described in Example 2. FIG. It is a partial block diagram of the failure detection system which concerns on embodiment described in Example 3. FIG. It is a partial block diagram of the failure detection system which concerns on embodiment described in Example 3. FIG. 12 is a waveform diagram of output signals of a pulse modulation circuit and a reception level determination circuit according to an embodiment described in Example 3. FIG. It is a conceptual diagram of the electric vehicle electric power feeding system which concerns on embodiment described in Example 4. FIG.

  Hereinafter, a failure detection system according to the present invention will be described with reference to the accompanying drawings.

  FIG. 1 shows an overall configuration diagram of the mobile control system. The configuration on the vehicle body side includes an on-vehicle communication device 106 attached to the vehicle body 101, a transmission / reception unit 104 that controls input signals to the on-vehicle communication device 106, decodes a signal received from the on-vehicle communication device, and the like. A control unit 105 that controls acceleration / deceleration and the like, a control of the transmission / reception unit 104, processing of signal information, and a system kernel 103 that transmits a control signal to the control unit 105 based on the processing are included. On the ground side, a ground communication device 107 that operates on a track 102 without a power source is disposed.

  The on-board communication device 106 and the ground communication device 107 include a loop antenna (or called a loop coil), and a power wave 108 is transmitted from the on-board communication device 106 side and receives the power. Is driven. The driven ground communication device 107 transmits the signal information stored in the built-in memory or the like as the signal wave 109, and the loop antenna of the on-vehicle communication device 106 receives the signal information. The transmission / reception unit 104 performs a decoding process on the received signal wave 109, cuts out a message, and reports a message such as point information included in the signal wave 109 to the system kernel 103.

  Based on the spot information reported from the transmission / reception unit 104, the speed information acquired from the control unit 105, etc., the system kernel 103 selects a driving pattern stored in advance or calculates the driving pattern by calculation, and the control unit A control signal such as power running or a brake pattern is transmitted to 105. In addition, the transmission / reception unit 104 receives a command from the system kernel 103, generates a power wave 108, sends it to the on-board communication device 106, and when an abnormality such as a failure is detected in the transmission / reception system, A function for reporting an abnormality detection signal to the system kernel 103 is provided.

  FIG. 2 is a partial configuration diagram of the transmission / reception unit 104 and the on-vehicle communication device 106 according to the present embodiment. The on-board communication device 106 includes independent transmission / reception antennas 201 and 202 and a test signal transmission antenna 203. The independent transmission / reception antennas 201 and 202 are arranged in a nested manner or arranged in the horizontal direction, and the resonance frequency is adjusted to the transmission / reception frequency defined by the system. The test signal transmission antenna 203 is disposed in the vicinity of the loop antenna 201 or 202 defined as a reception antenna, and adjusts the resonance frequency so as to operate at a system-defined reception frequency. This antenna may be defined as a non-resonant loop antenna. In that case, it is necessary to increase the loop diameter or to improve the transmission / reception sensitivity as a multi-turn coil. In addition, it is desirable to provide all the antennas on the same plane so that they can be easily manufactured. However, if there are restrictions on the arrangement due to the housing structure of the on-board communication device 106, the antennas are appropriately spaced in the height direction. May be provided.

  The following shows a configuration example when the transmitting and receiving antennas are defined as the receiving antenna 201 and the transmitting antenna 202, respectively. The transmission / reception unit 104 mainly includes a transmission circuit 210 that generates a power wave 108, a reception circuit 211 that performs demodulation of the signal wave 109, a test signal generation circuit 212 that generates a test signal for testing the reception circuit 211, and an output. It includes an input / output state monitoring unit 213 that performs signal control, reception signal processing, and monitoring signal monitoring. Since the input / output state monitoring unit 213 must process a signal at high speed, a hardware device such as an FPGA (Field-Programmable Gate Array) is generally used. The receiving antenna 201 is connected to the receiving circuit 211 via a cable 214 of about 10 to 30 m. The reception circuit 211 is a circuit that performs demodulation processing of a signal received from the ground communication device 107. The demodulated signal is output to the output terminal 213A after being subjected to decryption processing, message segmentation, and the like in the input / output state monitoring unit 213, and is reported to the system kernel 103 described above.

  The transmission antenna 202 is connected to the transmission circuit 210 via a cable 205 having a length similar to that of the cable 214. The transmission circuit 210 includes a directional coupler 207 that extracts part of a traveling wave and a reflected wave, a power amplifier 208 that amplifies a power wave, and a bandpass filter 209. The directional coupler 207 extracts a traveling wave from the power amplifier 208 and a part of a reflected wave from the transmission antenna 202. Since the magnitude of the reflected wave changes depending on the matching state of the transmission antenna 202, if these two extracted signals are input to the input / output state monitoring unit 213, the magnitude of the output from the power amplifier 208 and the matching of the transmission antenna 202 are determined. It is possible to monitor the state and the like. A band pass filter 209 or the like may be provided in the extracted signal output unit of the directional coupler 207 for the purpose of suppressing the influence of the received signal and noise.

  As an abnormality detection method using the extracted signal, the value of the initial extracted signal when the on-board communication device 106 is installed in the vehicle body 101 is stored in advance as a reference value, and the normal / A method such as judging abnormality is conceivable. When there is a metal plate directly under the on-board communication device 106, for example, when passing over an iron bridge, the matching state of the transmission antenna 202 may be affected. It is desirable to provide a timer function or the like and a step of determining whether or not the change is temporary. If it is determined that the characteristic deterioration is steady, the input / output state monitoring unit 213 transmits an abnormality detection signal to the system kernel 103 via the output terminal 213A.

  The test signal transmission antenna 203 is connected to the test signal generation circuit 212 via a cable 206 having a length similar to that of the cable 214. The test signal generation circuit 212 is a circuit that generates a test signal that simulates a signal transmitted from the ground communication device 106, and is transmitted from the test signal transmission antenna 203 at a predetermined reception frequency of the system. This test signal is actually received by the receiving antenna 201 and demodulated in the receiving circuit 211 via the cable 214. Further, the input / output state monitoring unit 213 performs decoding processing, and by comparing with the signal input to the test signal generation circuit 212, it is possible to determine the normality / abnormality of the reception system including the reception antenna 201 and the cable 214. Become. If the decoding result is invalid, the input / output state monitoring unit 213 transmits an abnormality detection signal to the system kernel 103 via the output terminal 213A.

  The transmission interval of the test signal can be controlled by the input / output state monitoring unit 213, and the reliability of the reception system can be ensured as the transmission interval is shortened. On the other hand, since the possibility of interference with the signal wave 109 from the ground communication device 107 increases, it is necessary to optimally define the test signal length, transmission output, and the like by the system.

  According to the above configuration, it is possible to monitor the output from the power amplifier 208 in the transmission circuit 210, the matching state of the transmission antenna 202, and the normality / abnormality of the reception system including the reception antenna 201 and the cable 214. It is. That is, whether or not the power amplifier 208 is normal including the components between the input / output state monitoring unit 213 can be known by extracting a part of the traveling wave by the directional coupler 207. An abnormality in the matching state of the transmitting antenna 202 due to damage to the resonance circuit or the communication antenna pattern is caused by extracting a part of the reflected wave by the directional coupler 207 and extracting a part of the traveling wave extracted by the same directional coupler 207. You can know by comparing with. Whether or not the reception system is normal can be known by actually receiving and evaluating the test signal generated by the test signal generation circuit 212.

Unlike the above-described patent document, there is one feature of the present embodiment in that it is possible not only to detect an abnormality such as a failure but also to know which component has an abnormality.
In the reception system, the reception antenna 201 and the reception circuit 211 are detected together. If there is an abnormality in the receiving antenna 201, the matching state of the transmitting antenna 202 is often affected. For this reason, when an abnormality in the reception system is detected when there is no abnormality in the matching state of the transmission antenna 202, it can be estimated that the reception circuit 211 is abnormal. For this reason, there is no problem in knowing an abnormal component.

In the present embodiment, a configuration when the transmission / reception antenna in the first embodiment is one element will be described. In addition, in the partial configuration example of the moving body detection device described below, the description overlapping the above-described embodiment is omitted.
In the first embodiment, the transmitting and receiving antennas are defined as the independent receiving antenna 201 and the transmitting antenna 202, respectively, but in this embodiment, the transmitting and receiving antenna is defined as a single element transmitting and receiving antenna 215. By making the transmission / reception antenna one element, the transmission circuit 210 requires a device such as a duplexer, but the cable 205 can be integrated, and the coupling between the reception antenna 201 and the transmission antenna 202 is further reduced. There is an advantage that improvement in radiation efficiency can be expected because it is eliminated.

  FIG. 3 shows a configuration example. The transmission / reception antenna 215 is adjusted to resonate at two transmission / reception frequencies defined by the system, and is connected to the transmission circuit 210 via a cable 205 of about 10 to 30 m. The transmission circuit 210 includes a directional coupler 207 that extracts a part of the traveling wave and reflected wave of the power wave 108, a demultiplexer 216 that separates the received signal wave 109, a power amplifier 208, and a system-specified transmission frequency band. And a band pass filter 217 that passes a system predetermined reception frequency band.

  The directional coupler 207 extracts the power wave output from the power amplifier 208 and a part of the power wave reflected from the transmission antenna 215. Similar to the above-described embodiment, the magnitude of the reflected power wave changes depending on the matching state of the transmission / reception antenna 215, so if these two extracted signals are input to the input / output state monitoring unit 213, It is possible to monitor the magnitude of the output and the matching state of the transmission / reception antenna 215. A bandpass filter 209 is provided at the extracted signal output unit of the directional coupler 207 and a bandpass filter 217 is provided at the signal wave 109 output unit of the demultiplexer 216 for the purpose of suppressing the influence of interference and noise of the transmission / reception signal. May be. Further, the order of the directional coupler 207 and the duplexer 216 may be switched.

The signal wave 109 separated by the branching filter 216 is input to the input / output state monitoring unit 213 via the receiving circuit 211. The test signal output from the test signal generation circuit 212 is received by the transmission / reception antenna 215 via the test signal transmission antenna 203, and after passing through the cable 205, the directional coupler 207, and the demultiplexer 216, the reception circuit 211, and the process returns to the input / output state monitoring unit 213. By comparing the input / output state monitoring unit 213 with the signal input to the test signal generation circuit 212, it is possible to determine whether the reception system including the reception antenna 215 and the cable 205 is normal or abnormal.
As described above, also in the embodiment in which the transmission / reception antenna is one element, the same effect as in the first embodiment can be obtained.

In the present embodiment, a power wave monitoring antenna 218, a pulse modulation circuit 219, and a reception level determination circuit 220 are added to the partial configuration of the moving object detection apparatus in the first and second embodiments. Therefore, the description which overlaps with the Example mentioned above is abbreviate | omitted.
FIG. 4 shows a configuration example when the transmission / reception antenna is two independent elements, and FIG. 5 shows a configuration example when the transmission / reception antenna is one element. Since the configurations of the transmission circuit 210, the reception circuit 211, the test signal generation circuit 212 and the cables and antennas attached thereto are described in the first and second embodiments, in this embodiment, the transmission antenna 202 or the transmission / reception antenna 215 is used. The configuration example of the monitoring device for the power wave 108 that is actually output from will be described in detail.

  As shown in FIG. 4, when the transmitting and receiving antennas are two independent elements, the on-board communication device 106 has independent receiving antennas 201 and transmitting antennas 202, a test signal transmitting antenna 203, and a power wave monitoring antenna 218, respectively. doing. The antennas are nested or arranged side by side in the horizontal direction, but the test signal transmission antenna 203 needs to be arranged near the reception antenna 201 and the power wave monitoring antenna 218 needs to be arranged near the transmission antenna 202. The test signal transmitting antenna 203 adjusts the resonance frequency at the system-defined reception frequency, and the power wave monitoring antenna 218 adjusts the resonance frequency at the system-specified transmission frequency. The test signal transmission antenna 203 and the power wave monitoring antenna 218 may be defined as non-resonant loop antennas, but in that case, it is necessary to increase the loop diameter or improve the transmission / reception sensitivity as a coil of multiple turns. There is. In addition, it is desirable to provide all the antennas on the same plane so that they can be easily manufactured. However, if there are restrictions on the arrangement due to the housing structure of the on-board communication device 106, the antennas are appropriately spaced in the height direction. May be provided.

  As shown in FIG. 5, when the transmission / reception antenna is one element, the on-board communication device 106 includes one transmission / reception antenna 215, a test signal transmission antenna 203, and a power wave monitoring antenna 218. Each antenna is nested or arranged side by side in the horizontal direction, but the test signal transmission antenna 203 and the power wave monitoring antenna 218 need to be arranged in the vicinity of the transmission / reception antenna 215. The test signal transmission antenna 203 and the power wave monitoring antenna 218 may be defined as non-resonant loop antennas, but in that case, it is necessary to increase the loop diameter or improve the transmission / reception sensitivity as a coil of multiple turns. There is. In addition, it is desirable to provide all the antennas on the same plane so that they can be easily manufactured. However, if there are restrictions on the arrangement due to the housing structure of the on-board communication device 106, the antennas are appropriately spaced in the height direction. May be provided.

  The power wave monitoring antenna 218 is connected to the pulse modulation circuit 219. The pulse modulation circuit 219 generates a pulse modulation signal including PPM (Pulse Position Modulation) and PWM (Pulse Width Modulation) representing the intensity of the received signal. The pulse modulation circuit 219 generates a pulse modulation signal in accordance with the power received by the power monitoring antenna 218, thereby making it less susceptible to attenuation and ambient noise in the cable 221 with the reception level determination circuit 220. The pulse modulation signal is input to the reception level determination circuit 220 and converted into a DC signal by a capacitor included in the reception level conversion circuit. Since the magnitude of the DC signal is proportional to the received power at the power wave monitoring antenna 218, the DC signal is input to the input / output state monitoring unit 213 and monitored, so that the transmission antenna 202 or the transmission / reception antenna The intensity of the actual power wave 108 output from 215 can be obtained.

  In FIG. 6, an actual power wave output from the transmission antenna 202 or the transmission / reception antenna 215, an output wave of the pulse modulation circuit 219 input to the cable 221, and an output waveform example of the reception level determination circuit 220 in the above order. (1) (2) (3) When a metal comes close to the transmission antenna 202 or the transmission / reception antenna 215, or when the antenna breaks down, the output decreases as indicated by a dotted line portion (1) in the figure. This decrease in the transmission level is linked with the decrease in the reception power at the power wave monitoring antenna 218, and the output signal of the pulse modulation circuit also changes as indicated by (2) in the figure (since it is PPM in the figure, the output is reduced) In response, the pulse interval is reduced from 25 to 9 usec). This signal is converted into a direct current as shown by (3) in the figure by a capacitor or the like included in the reception level determination circuit 220. Thereby, the power wave monitoring system which shows the stable output result by simple structure can be comprised.

  In this configuration, pulse modulation corresponding to the magnitude of the power wave 108 is applied, but other modulation methods such as amplitude modulation and frequency modulation may be employed. However, in general, the on-board communication device 106 and the transmission / reception unit 104 are often connected by a cable of about 10 to 30 m. For this reason, if the signal received by the power wave monitoring antenna 218 is supplied to the level determination circuit 220 as it is, it is affected by attenuation and noise, and the level fluctuation cannot be observed accurately. Furthermore, since it is not desirable to consume a large amount of power of the power wave 108 from the viewpoint of transmission efficiency, it is necessary to transmit between the cables 221 with a small voltage value of about several volts. Considering the configuration of the demodulation system, pulse modulation is optimal. However, if there is a margin in system design such as power consumption and mounting area, other modulation methods can be employed without any problem. However, in that case, it is necessary to provide a corresponding demodulation circuit in the level determination circuit 220.

  According to the above configuration, the reception system is as described above, and also in the transmission system, the output from the power amplifier 208 in the transmission circuit 210, the matching state of the transmission antenna 202, and further from the transmission antenna 202 or the transmission / reception antenna 215. The actual output can be monitored. That is, by adding the power wave monitoring antenna 218 to the on-board communication device 106 with respect to the first and second embodiments, the deterioration of characteristics of the cable connecting the directional coupler 207 from the communication antenna is also detected separately. be able to.

  As a result, it is possible to detect a failure due to breakage of the metal present in the vicinity of the on-board communication device 106, the cable 205, or the like with high accuracy. For example, if the level of the reflected wave output from the directional coupler 207 and the level of the reception level determination circuit 220 change simultaneously, it is possible to determine that the possibility that the monitoring system has failed is low. It can be detected. In addition, the ability to constantly monitor the power wave output value from the power amplifier 208 and the power wave output value from the actual antenna is useful in terms of performance assurance.

  In addition, since the output extracted from the power wave monitoring antenna 218 is desirably weak in terms of power transmission efficiency, it is likely to become unstable due to the influence of cable loss, external noise, etc., but a pulse modulation circuit 219 is provided. Thus, the above-mentioned influence can be reduced, and there is an effect that the amplitude of the power wave can be detected with higher accuracy than the above-described patent document.

  In FIG. 7, the conceptual diagram at the time of applying the Example of this invention to the electric power feeding system of an electric vehicle is shown. In recent years, contactless charging technology for electric vehicles has attracted attention, and the principle thereof is the same technology as the technology for transmitting the power wave 108 of the above-described embodiment to the antenna of the ground communication device 107 and driving it. Applicable. That is, the present invention can be applied to all moving objects. In this embodiment, a case where a charging transmission / reception antenna 215 is provided in the lower part of the electric vehicle 301 will be described.

  In this charging technique, the transmission / reception unit 104 and the transmission / reception antenna 215 are generally connected via a cable 205. For example, it is difficult to bury power amplifiers and power supplies in the ground from the viewpoint of maintenance, and only the cable 205 that transmits the transmission / reception antenna 215 and the power wave 108 or the signal wave 109 is embedded in the ground. Become. Considering the usage scene, it is considered that a cable 205 of several meters or more is required for connection from the home to the parking lot, connection from the roadside belt to the roadway, and the like. That is, the loss probability due to aging of the cable 205 of several meters or more and the probability of failure such as disconnection / short circuit cannot be ignored in this system.

  At the same time, from the viewpoint of power saving, it is necessary to ensure the normality of the transmission / reception antenna 215 and the receiving circuit for charge control. Since this charging system transmits power wirelessly, it is necessary to perform device authentication and charging control via wireless as well. The signal wave 109 is processed by a receiving circuit included in the transmission / reception unit 104 and reported to the system kernel 103. Based on the report contents, the system kernel 103 issues a command such as charge control. When the transmission / reception antenna 215 or the circuit breaks down, power of several tens of watts may be continuously output from the transmission / reception antenna 215, and the operation of the reception circuit must be constantly monitored. In addition, it is desirable that the output from the transmission / reception antenna is constantly monitored in order to prevent theft and leakage.

  According to the present embodiment, since the output of the actual power wave 108 from the transmission / reception antenna 215 can be confirmed by the power wave monitoring antenna 218, it is also output regarding a failure such as a loss due to aging of the cable 205, power theft or leakage. These can be detected by the decrease in. In addition, by monitoring a part of the reflected wave from the transmission / reception antenna 215 output from the directional coupler included in the transmission / reception unit 104, the normality of the monitoring system including the power wave monitoring antenna 218 is ensured, It is possible to accurately detect a failure caused by damage to a metal existing near the on-vehicle communication device 106, the cable 205, or the like. When the cable 205 is 1 m or less, it is considered that the cable is unlikely to be damaged. Therefore, the transmission / reception antenna output from the directional coupler included in the transmission / reception unit 104 without providing the power wave monitoring antenna 218. A simple configuration in which only a part of the reflected wave from 215 is monitored may be used.

In addition, by monitoring a part of the traveling wave from the power amplifier 208 output from the directional coupler included in the transmission / reception unit 104, the transmission circuit unit included from the power amplifier 208 to the input / output state monitoring unit 213 is monitored. Normality is guaranteed. Further, the test signal transmission antenna 203 can also confirm the normality of the reception circuit included in the transmission / reception unit 104 related to device authentication and charge control. Therefore, according to the present embodiment, it is possible to provide a charging system with high safety and easy identification of a failure location.
The embodiment described above is an example and does not limit the present invention. In each embodiment, for example, it is possible to consider an example in which the number of components is increased or decreased, and any change can be considered, but all fall within the scope of the present invention.

  DESCRIPTION OF SYMBOLS 101 ... Car body, 102 ... Course, 103 ... System kernel, 104 ... Transmission / reception part, 105 ... Control part, 106 ... On-board communication apparatus, 107 ... Ground communication apparatus, 108 ... Power wave, 109 ... Signal wave, 201 ... Reception antenna , 202 ... transmitting antenna, 203 ... test signal transmitting antenna, 205, 206, 214, 221 ... cable, 207 ... directional coupler, 208 ... power amplifier, 209, 217 ... band pass filter, 210 ... transmitting circuit, 211 ... Receiving circuit, 212 ... test signal generating circuit, 213 ... input / output state monitoring unit, 215 ... transmitting / receiving antenna, 216 ... demultiplexer, 218 ... power wave monitoring antenna, 219 ... pulse modulation circuit, 220 ... reception level judging circuit, 301 ... electric car, 302 ... charging system.

Claims (14)

A mobile body position detection device comprising an on-vehicle communication device having a communication antenna for communicating with a ground communication device provided on the ground,
A power amplifier that amplifies a power wave signal for transmission to the ground communication device and supplies the amplified signal to the communication antenna of the on-board communication device;
A power wave monitoring antenna for receiving a part of the power wave signal transmitted from the communication antenna of the on-board communication device;
An input / output state monitoring unit for monitoring a communication operation of the mobile body position detecting device;
A level determination circuit that determines a signal level of the power wave signal received by the power wave monitoring antenna and supplies the signal level to the input / output state monitoring unit;
Have
The level determination circuit is a pulse demodulation circuit that demodulates a pulse modulation signal,
A pulse modulation circuit for generating a pulse modulation signal corresponding to a signal level of the power wave signal received by the power wave monitoring antenna is provided between the power wave monitoring antenna and the level determination circuit;
The input / output state monitoring unit includes:
A mobile object position detection system comprising: a failure detection system that monitors a route of the power wave signal output from the power amplifier to a communication antenna of the on-board communication device based on the supplied signal level. apparatus. In the moving body position detection apparatus of Claim 1,
The mobile object position detecting device, wherein a communication antenna of the on-board communication device is shared by signal transmission and reception. In the moving body position detection apparatus of Claim 1,
Further, the traveling wave of the power wave signal supplied from the power amplifier is supplied to the communication antenna of the on-board communication device, and a part of the traveling wave of the power wave signal is branched and supplied to the communication antenna. A directional coupler for branching a part of the reflected wave of the power wave signal;
A receiving circuit for processing a received signal received by a communication antenna of the on-board communication device, including a signal transmitted from the ground communication device;
A test signal generation circuit for monitoring the operation of the receiving circuit based on an instruction from the input / output state monitoring unit;
A test signal transmission antenna that is supplied with the test signal generated by the test signal generation circuit and transmits the test signal to a communication antenna of the on-board communication device;
With
The input / output state monitoring unit is supplied with a traveling wave and a reflected wave of the power wave signal partially branched by the directional coupler, and a reception signal processed by the reception circuit,
Monitoring the operation of the power amplifier based on the traveling wave of the power wave signal partially branched by the supplied directional coupler;
Monitoring the operation of the communication antenna of the on-board communication device based on the traveling wave and reflected wave of the power wave signal partially branched by the supplied directional coupler;
A moving body position detecting apparatus comprising: a failure detection system that monitors an operation of a receiving system including the receiving circuit based on the supplied test signal processed by the receiving circuit. In the moving body position detection apparatus of Claim 1,
A control unit for accelerating / decelerating the moving body;
A system kernel for supplying a control signal to the control unit;
The input / output state monitoring unit includes:
A moving body position detecting apparatus, wherein a failure detection result obtained by monitoring a signal level of the power wave signal received by the power wave monitoring antenna is supplied to the system kernel. In the moving body position detection apparatus of Claim 4,
The input / output state monitoring unit includes:
A mobile body position detecting device, wherein a failure is detected when a signal level of the power wave signal received by the power wave monitoring antenna is smaller than a predetermined value or a signal level cannot be obtained. In the moving body position detection apparatus of Claim 3,
The communication antenna of the on-board communication device is shared for signal transmission and reception,
A duplexer for demultiplexing a transmission signal and a reception signal between the communication antenna of the on-board communication device and the directional coupler, or between the directional coupler and the power amplifier;
The mobile body position detecting device, wherein the reception circuit is supplied with the reception signal demultiplexed by the demultiplexer. In the moving body position detection apparatus of Claim 3,
A control unit for accelerating / decelerating the moving body;
A system kernel for supplying a control signal to the control unit;
The input / output state monitoring unit includes:
The failure detection result obtained by monitoring the communication operation of the mobile body position detecting device based on the traveling wave, reflected wave of the power wave signal and the received signal processed by the receiving circuit is supplied to the system kernel. A moving body position detecting device characterized by the above. In the moving body position detection apparatus of Claim 7,
The input / output state monitoring unit includes:
A moving body position detecting apparatus, wherein a failure is detected when a level of a traveling wave, a reflected wave of the power wave signal, and a level of a reception signal processed by the reception circuit is smaller than a predetermined value. In the moving body position detection apparatus of Claim 2,
A control unit for accelerating / decelerating the moving body;
A system kernel for supplying a control signal to the control unit;
The input / output state monitoring unit includes:
A moving body position detecting apparatus, wherein a failure detection result obtained by monitoring a signal level of the power wave signal received by the power wave monitoring antenna is supplied to the system kernel. In the moving body position detection apparatus of Claim 9,
The input / output state monitoring unit includes:
A mobile body position detecting device, wherein a failure is detected when a signal level of the power wave signal received by the power wave monitoring antenna is smaller than a predetermined value or a signal level cannot be obtained. A wireless power transmission device including a power transmission device having a communication antenna that communicates with a power receiving device receiving power supply,
A power amplifier that amplifies a power wave signal to be transmitted to the power receiving device and supplies the amplified signal to the communication antenna of the power transmitting device;
A power wave monitoring antenna for receiving a part of the power wave signal transmitted from a communication antenna of the power transmission device;
An input / output state monitoring unit for monitoring the communication operation of the wireless power transmission device;
A level determination circuit that determines a signal level of the power wave signal received by the power wave monitoring antenna and supplies the signal level to the input / output state monitoring unit;
Have
The level determination circuit is a pulse demodulation circuit that demodulates a pulse modulation signal,
A pulse modulation circuit for generating a pulse modulation signal corresponding to a signal level of the power wave signal received by the power wave monitoring antenna is provided between the power wave monitoring antenna and the level determination circuit;
The input / output state monitoring unit includes:
A wireless power transmission apparatus comprising: a failure detection system that monitors a path of the power wave signal supplied from the power amplifier to a communication antenna of the power transmission apparatus based on the supplied signal level. The wireless power transmission device according to claim 11,
Further, the traveling wave of the power wave signal supplied from the power amplifier is supplied to the communication antenna of the power transmission device, a part of the traveling wave of the power wave signal is branched, and the power supplied to the communication antenna A directional coupler for branching a part of the reflected wave of the wave signal;
A reception circuit for processing a reception signal received by a communication antenna of the power transmission device including a signal transmitted from the power transmission device;
A test signal generation circuit for monitoring the operation of the receiving circuit based on an instruction from the input / output state monitoring unit;
A test signal transmission antenna that is supplied with the test signal generated by the test signal generation circuit and transmits the test signal to a communication antenna of the power transmission device;
With
The input / output state monitoring unit is supplied with a traveling wave and a reflected wave of the power wave signal partially branched by the directional coupler, and a reception signal processed by the reception circuit,
Monitoring the operation of the power amplifier based on the traveling wave of the power wave signal partially branched by the supplied directional coupler;
Monitoring the operation of the communication antenna of the power transmission apparatus based on the traveling wave and reflected wave of the power wave signal partially branched by the supplied directional coupler;
A wireless power transmission apparatus comprising: a failure detection system that monitors an operation of a reception system including the reception circuit based on the supplied test signal processed by the reception circuit. The wireless power transmission device according to claim 12,
A control unit for controlling the power transmission;
A system kernel for supplying a control signal to the control unit;
The input / output state monitoring unit includes:
Supplying the system kernel with a failure detection result obtained by monitoring a communication operation of the wireless power transmission device based on a traveling wave, a reflected wave of the power wave signal, and a reception signal processed by the reception circuit; A wireless power transmission device. The wireless power transmission device according to claim 11,
A control unit for controlling the power transmission ;
A system kernel for supplying a control signal to the control unit;
The input / output state monitoring unit includes:
A wireless power transmission apparatus, wherein a failure detection result obtained by monitoring a signal level of the power wave signal received by the power wave monitoring antenna is supplied to the system kernel.

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