Ground power supply device, control method of ground power supply device, and non-volatile computer storage medium

Abstract

The present invention provides a ground power supply device, a control method thereof, and a non-volatile computer storage medium, enabling rapid resumption of power transmission in the event of interrupted power delivery. The ground power supply device includes: a power transmission device having a resonant circuit for transmitting power to a vehicle; and a control device that, when an interruption condition is satisfied while the state of the ground power supply device is a formal power transmission state or a power transmission activation state, changes the state of the device to a standby state, and when the interruption condition is no longer satisfied while the state of the ground power supply device is a standby state, changes the state of the device to a power transmission activation state. The formal power transmission state is a state in which power is supplied to the resonant circuit to transmit power to the vehicle, the power transmission activation state is a state in which weak power is supplied to the resonant circuit to enable power transmission to the vehicle, and the standby state is a state in which power supply to the resonant circuit is stopped and the state can be changed to the power transmission activation state by supplying weak power to the resonant circuit.

Description

Technical Field

[0001] The present invention relates to an above-ground power supply device. Background Art

[0002] Conventionally, a non-contact power supply system is known in which power is transmitted in a non-contact manner from an above-ground power supply device provided on the ground to a traveling vehicle using a transmission method such as magnetic field coupling (electromagnetic induction), electric field coupling, magnetic field resonance coupling (magnetic resonance), and electric field resonance coupling (electric resonance). As such a non-contact power supply system, Patent Document 1 discloses the following non-contact power supply system: In the process of performing a plurality of power supply-related processes in a predetermined order by transmitting and receiving data with an above-ground power supply device, when the process is interrupted, if the interruption point is before the completion of a predetermined process determined in advance, the plurality of processes are restarted from the beginning. On the other hand, if the interruption point is after the completion of the predetermined process, the plurality of processes are executed from the beginning to the predetermined process, and then the process is restarted from the interruption point.

[0003] Prior Art Documents

[0004] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2020-127313 Summary of the Invention

[0005] Problems to be Solved by the Invention

[0006] However, in the case of restarting power transmission after an interruption in power transmission, if it is necessary to perform the processes for power transmission from the beginning, there is a problem that it takes time until power transmission is restarted.

[0007] The present invention has been made in view of such problems, and an object thereof is to enable quick restart of power transmission in the case of an interruption in power transmission.

[0008] Means for Solving the Problems

[0009] In order to solve the above problems, a ground power supply device for non - contact power transmission to a vehicle according to a certain aspect of the present invention includes: a power transmission device having a resonant circuit for transmitting power to the vehicle; and a control device configured to change the state of the ground power supply device to the standby state when a predetermined interruption condition is satisfied while the state of the ground power supply device is the formal power transmission state or the power transmission activation state, and to change the state of the ground power supply device to the power transmission activation state when the interruption condition is no longer satisfied while the state of the ground power supply device is the standby state. The formal power transmission state is a state in which power is supplied to the resonant circuit to transmit power to the vehicle, the power transmission activation state is a state in which weak power is supplied to the resonant circuit and power transmission to the vehicle can be achieved, the standby state is a state in which power supply to the resonant circuit is stopped, and it is a state that can be changed to the power transmission activation state by supplying weak power to the resonant circuit.

[0010] Advantages of the Invention

[0011] According to this aspect of the present invention, power transmission can be quickly restarted in the case where power transmission is interrupted. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 FIG. schematically shows the structure of a non - contact power supply system.

[0013] Figure 2 FIG. is a schematic structural diagram of a controller and devices connected to the controller.

[0014] Figure 3 FIG. is a schematic structural diagram of an ECU and devices connected to the ECU.

[0015] Figure 4 FIG. shows an example of the arrangement of magnetic field detectors provided on a road.

[0016] Figure 5 FIG. is a schematic structural diagram of a communication system used in a non - contact power supply system.

[0017] Figure 6 FIG. schematically shows the hardware structure of a server.

[0018] Figure 7 FIG. is a sequence diagram related to communication between a vehicle, a server, and a ground power supply device using wide - area wireless communication.

[0019] Figure 8 FIG. is related to communication between a vehicle, a server, and a ground power supply device using wide - area wireless communication and is Figure 7 the same sequence diagram.

[0020] Figure 9It is a flowchart showing the process of communication related to wide - area wireless communication in a server.

[0021] Figure 10 It is a flowchart showing the process of communication related to wide - area wireless communication in a ground power supply device.

[0022] Figure 11 It is a diagram schematically showing the transition of the actions and states of a vehicle and a ground power supply device when the vehicle approaches the ground power supply device for power supply.

[0023] Figure 12 It is a diagram schematically showing the transition of the state and actions of a ground power supply device.

[0024] Figure 13 It is a diagram schematically showing the transition of the state and actions of a ground power supply device.

[0025] Figure 14 It is a diagram schematically showing the transition of the state and actions of a vehicle.

[0026] Figure 15 It is a flowchart showing the process of operations related to the execution of power - receiving end processing. Detailed Embodiments

[0027] Hereinafter, the embodiments will be described in detail with reference to the accompanying drawings. In the following description, the same reference numerals are assigned to the same components.

[0028] <Overall Structure of Non - contact Power Supply System 1>

[0029] Figure 1 It is a diagram schematically showing the structure of the non - contact power supply system 1. The non - contact power supply system 1 includes a ground power supply device 2 and a vehicle 3 traveling on a road 100, and performs non - contact power transmission based on magnetic - field resonance coupling (magnetic - field resonance) from the ground power supply device 2 to the vehicle 3. In particular, in the present embodiment, the non - contact power supply system 1 performs non - contact power transmission from the ground power supply device 2 to the vehicle 3 while the vehicle 3 is traveling. Therefore, the ground power supply device 2 transmits power to the vehicle 3 in a non - contact manner while the vehicle 3 is traveling, and the vehicle 3 receives power from the ground power supply device 2 in a non - contact manner while the vehicle 3 is traveling. The ground power supply device 2 has a power - transmitting device 4 configured to transmit power to the vehicle 3 in a non - contact manner, and the vehicle 3 has a power - receiving device 5 configured to receive power from the power - transmitting device 4 in a non - contact manner. As Figure 1 shown, the power - transmitting device 4 is buried in the road 100 (under the ground) on which the vehicle 3 travels, for example, at the center of the lane on which the vehicle 3 travels.

[0030] In addition, the term "in motion" means the state in which the vehicle 3 is located on the road for travel. Therefore, the term "in motion" includes not only the state in which the vehicle 3 is actually traveling at any speed greater than zero, but also the state in which the vehicle 3 is stopped on the road, for example, due to waiting for a traffic light. On the other hand, even if the vehicle 3 is located on the road, for example, in a parked state, it is not included in "in motion".

[0031] <Structure of the ground power supply device>

[0032] As Figure 1 shown, the ground power supply device 2 includes a power supply 21 and a controller 22 in addition to the power transmission device 4. The power supply 21 and the controller 22 can be buried in the road 100 or can be arranged in a place different from the inside of the road 100 (including the ground).

[0033] The power supply 21 supplies power to the power transmission device 4. The power supply 21 is, for example, a commercial AC power supply that supplies single-phase AC power. In addition, the power supply 21 can be other AC power supplies that supply three-phase AC power, or can be a DC power supply such as a fuel cell.

[0034] The power transmission device 4 transmits the power supplied from the power supply 21 to the vehicle 3. The power transmission device 4 has a power transmission side rectifier circuit 41, a converter 42, and a power transmission side resonance circuit 43. In the power transmission device 4, the AC power supplied from the power supply 21 is rectified in the power transmission side rectifier circuit 41 and converted into a DC current, and this DC current is converted into AC power in the converter 42, and this AC power is supplied to the power transmission side resonance circuit 43.

[0035] The power transmission side rectifier circuit 41 is electrically connected to the power supply 21 and the converter 42. The power transmission side rectifier circuit 41 rectifies the AC power supplied from the power supply 21 and converts it into DC power, and supplies the DC power to the converter 42. The power transmission side rectifier circuit 41 is, for example, an AC / DC converter.

[0036] The converter 42 is electrically connected to the power transmission side rectifier circuit 41 and the power transmission side resonance circuit 43. The converter 42 converts the DC power supplied from the power transmission side rectifier circuit 41 into AC power (high-frequency power) having a frequency higher than the AC power of the power supply 21, and supplies the high-frequency power to the power transmission side resonance circuit 43.

[0037] The power transmission side resonance circuit 43 has a resonator composed of a coil 44 and a capacitor 45. Various parameters of the coil 44 and the capacitor 45 (the outer diameter and inner diameter of the coil 44, the number of turns of the coil 44, the static capacitance of the capacitor 45, etc.) are determined so that the resonance frequency of the power transmission side resonance circuit 43 becomes a predetermined set value. The predetermined set value is, for example, 10 kHz to 100 GHz, and preferably 85 kHz determined by the SAE TIR J2954 standard as a frequency band for non-contact power transmission.

[0038] The power transmission side resonance circuit 43 is arranged at the center of the lane through which the vehicle 3 passes in such a manner that the center of the coil 44 is located at the center of the lane. When high-frequency power supplied from the converter 42 is applied to the power transmission side resonance circuit 43, the power transmission side resonance circuit 43 generates an alternating magnetic field for power transmission. In addition, when the power source 21 is a DC power source, the power transmission side rectifier circuit 41 can also be omitted.

[0039] The controller 22 is, for example, a general-purpose computer and performs various controls of the ground power supply device 2. For example, the controller 22 is electrically connected to the converter 42 of the power transmission device 4 and controls the converter 42 in order to control the power transmission of the power transmission device 4. In addition, the controller 22 controls the ground side first communication device 81 and the ground side second communication device 82 described later.

[0040] Figure 2 It is a schematic structural diagram of the controller 22 and the devices connected to the controller 22. The controller 22 includes a communication interface 221, a memory 222, and a processor 223. The communication interface 221, the memory 222, and the processor 223 are connected to each other via signal lines.

[0041] The communication interface 221 has an interface circuit for connecting the controller 22 to various devices (for example, the converter 42, the ground side sensor 23 described later, the ground side first communication device 81, the ground side second communication device 82, etc.) constituting the ground power supply device 2. The controller 22 communicates with other devices via the communication interface 221.

[0042] The memory 222 has, for example, a volatile semiconductor memory (for example, RAM), a non-volatile semiconductor memory (for example, ROM), etc. The memory 222 stores computer programs for executing various processes in the processor 223 and various data used when the processor 223 executes various processes. The memory 222 stores, for example, a list of vehicle identification information of vehicles that may be powered by the ground power supply device 2 (hereinafter referred to as "identification information list") and the vehicle identification information of the vehicle 3 during power supply.

[0043] The processor 223 has one or more CPUs (Central Processing Unit) and its peripheral circuits. The processor 223 may also have arithmetic circuits such as a logic operation unit or a numerical operation unit. The processor 223 executes various processes based on the computer programs stored in the memory 222.

[0044] In addition, as Figure 2As shown, the ground power supply device 2 further includes a ground-side sensor 23. The ground-side sensor 23 detects the state of the ground power supply device 2. In the present embodiment, the ground-side sensor 23 includes, for example: a power transmission device current sensor that detects the current flowing through various devices of the power transmission device 4 (especially, the power transmission-side resonant circuit 43, the converter 42, and the power transmission-side rectifier circuit 41), a power transmission device voltage sensor that detects the voltage applied to various devices of the power transmission device 4, a power transmission device temperature sensor that detects the temperature of various devices of the power transmission device 4, a foreign object sensor that detects foreign objects on the road where the power transmission device 4 is buried, and a biological sensor that detects living organisms on the road where the power transmission device 4 is buried. The output of the ground-side sensor 23 is input to the controller 22.

[0045] In addition, the power transmission device 4 may be configured to be able to receive power from the vehicle 3. In this case, the power transmission device 4, like the power receiving device 5 of the vehicle 3 described later, has a device or circuit for supplying the received power to the power supply 21. In addition, in this case, the power transmission device 4 may also utilize the resonator composed of the coil 44 and the capacitor 45 described above to receive power from the vehicle 3.

[0046] <Structure of the vehicle>

[0047] On the other hand, as Figure 1 shown, in addition to the power receiving device 5, the vehicle 3 further includes an electric motor 31, a storage battery 32, a power control unit (PCU) 33, and an electronic control unit (ECU) 34. In the present embodiment, the vehicle 3 is an electric vehicle (EV) in which the electric motor 31 drives the vehicle 3. However, the vehicle 3 may also be a hybrid vehicle (HV) in which, in addition to the electric motor 31, an internal combustion engine also drives the vehicle 3.

[0048] The electric motor 31 is, for example, an AC synchronous motor and functions as both an electric motor and a generator. When the electric motor 31 functions as an electric motor, it is driven by the power stored in the storage battery 32 as a power source. The output of the electric motor 31 is transmitted to the wheels 30 via a speed reducer and an axle. On the other hand, when the vehicle 3 decelerates, the electric motor 31 is driven by the rotation of the wheels 30, and the electric motor 31 functions as a generator to generate regenerative power.

[0049] The storage battery 32 is a rechargeable secondary battery, which is composed of, for example, a lithium-ion battery, a nickel-metal hydride battery, etc. The storage battery 32 stores the electric power required for the running of the vehicle 3 (for example, the driving power of the electric motor 31). When the power received by the power receiving device 5 from the power transmitting device 4 is supplied, the storage battery 32 is charged. In addition, when the regenerative power generated by the electric motor 31 is supplied to the storage battery 32, the storage battery 32 is charged. When the storage battery 32 is charged, the charging rate (SOC: State Of Charge) of the storage battery 32 is restored. In addition, the storage battery 32 can also be charged via the charging port provided on the vehicle 3 by an external power source other than the ground power supply device 2.

[0050] The PCU 33 is electrically connected to the storage battery 32 and the electric motor 31. The PCU 33 has an inverter, a boost converter, and a DC / DC converter. The inverter converts the DC power supplied from the storage battery 32 into AC power and supplies the AC power to the electric motor 31. On the other hand, the inverter converts the AC power (regenerative power) generated by the electric motor 31 into DC power and supplies the DC power to the storage battery 32. When the power stored in the storage battery 32 is supplied to the electric motor 31, the boost converter boosts the voltage of the storage battery 32 as needed. When the power stored in the storage battery 32 is supplied to electronic devices such as headlights, the DC / DC converter steps down the voltage of the storage battery 32.

[0051] The power receiving device 5 receives power from the power transmitting device 4 and supplies the received power to the storage battery 32. The power receiving device 5 has: a power receiving side resonance circuit 51, a power receiving side rectifier circuit 54, and a charging circuit 55.

[0052] The power receiving side resonance circuit 51 is arranged at the bottom of the vehicle 3 in such a way that the distance from the road surface becomes smaller. In the present embodiment, the power receiving side resonance circuit 51 is arranged at the center of the vehicle 3 in the vehicle width direction. The power receiving side resonance circuit 51 has the same structure as the power transmitting side resonance circuit 43 and has a resonator composed of a coil 52 and a capacitor 53. The various parameters of the coil 52 and the capacitor 53 (the outer diameter and inner diameter of the coil 52, the number of turns of the coil 52, the static capacitance of the capacitor 53, etc.) are determined in such a way that the resonance frequency of the power receiving side resonance circuit 51 is consistent with the resonance frequency of the power transmitting side resonance circuit 43. In addition, if the deviation amount between the resonance frequency of the power receiving side resonance circuit 51 and the resonance frequency of the power transmitting side resonance circuit 43 is small, for example, if the resonance frequency of the power receiving side resonance circuit 51 is within the range of ±20% of the resonance frequency of the power transmitting side resonance circuit 43, the resonance frequency of the power receiving side resonance circuit 51 does not necessarily need to be consistent with the resonance frequency of the power transmitting side resonance circuit 43.

[0053] In the case of Figure 1When the power receiving side resonance circuit 51 faces the power transmitting side resonance circuit 43 as shown, when an alternating magnetic field is generated by the power transmitting side resonance circuit 43, the vibration of the alternating magnetic field is transmitted to the power receiving side resonance circuit 51 that resonates at the same resonance frequency as the power transmitting side resonance circuit 43. As a result, an induced current flows in the power receiving side resonance circuit 51 by electromagnetic induction, and an induced electromotive force is generated in the power receiving side resonance circuit 51 by the induced current. That is, the power transmitting side resonance circuit 43 transmits power to the power receiving side resonance circuit 51, and the power receiving side resonance circuit 51 receives power from the power transmitting side resonance circuit 43.

[0054] The power receiving side rectifier circuit 54 is electrically connected to the power receiving side resonance circuit 51 and the charging circuit 55. The power receiving side rectifier circuit 54 rectifies the AC power supplied from the power receiving side resonance circuit 51 and converts it into DC power, and supplies the DC power to the charging circuit 55. The power receiving side rectifier circuit 54 is, for example, an AC / DC converter.

[0055] The charging circuit 55 is electrically connected to the power receiving side rectifier circuit 54 and the storage battery 32. In particular, it is connected to the storage battery 32 via a relay 38. The charging circuit 55 converts the DC power supplied from the power receiving side rectifier circuit 54 into the voltage level of the storage battery 32 and supplies it to the storage battery 32. When the power transmitted from the power transmitting device 4 is supplied to the storage battery 32 by the power receiving device 5, the storage battery 32 is charged. The charging circuit 55 is, for example, a DC / DC converter.

[0056] The ECU 34 performs various controls of the vehicle 3. For example, the ECU 34 is electrically connected to the charging circuit 55 of the power receiving device 5, and controls the charging circuit 55 to control the charging of the storage battery 32 with the power transmitted from the power transmitting device 4. In addition, the ECU 34 is electrically connected to the PCU 33, and controls the PCU 33 to control the transfer of power between the storage battery 32 and the electric motor 31. Furthermore, the ECU 34 controls the vehicle side first communication device 71 and the vehicle side second communication device 72 described later.

[0057] Figure 3 is a schematic structural diagram of the ECU 34 and the devices connected to the ECU 34. The ECU 34 includes: a communication interface 341, a memory 342, and a processor 343. The communication interface 341, the memory 342, and the processor 343 are connected to each other via signal lines.

[0058] The communication interface 341 has an interface circuit for connecting the ECU 34 to an in-vehicle network compliant with a standard such as CAN (Controller Area Network). The ECU 34 communicates with other devices via the communication interface 341.

[0059] The memory 342 has, for example, a volatile semiconductor memory (e.g., RAM) and a non-volatile semiconductor memory (e.g., ROM). The memory 342 stores computer programs for executing various processes in the processor 343 and various data used when the processor 343 executes various processes, etc.

[0060] The processor 343 has one or more CPUs (Central Processing Unit) and its peripheral circuits. The processor 343 may also have an arithmetic circuit such as a logical arithmetic unit or a numerical arithmetic unit. The processor 343 executes various processes based on the computer programs stored in the memory 342.

[0061] In addition, as Figure 3 shown, the vehicle 3 further includes: a GNSS receiver 35, a storage device 36, a plurality of vehicle-side sensors 37, and a relay 38. The GNSS receiver 35, the storage device 36, the vehicle-side sensors 37, and the relay 38 are electrically connected to the ECU 34 via an in-vehicle network.

[0062] The GNSS receiver 35 detects the current position of the vehicle 3 (e.g., the latitude and longitude of the vehicle 3) based on the positioning information obtained from a plurality of (e.g., three or more) positioning satellites. Specifically, the GNSS receiver 35 captures a plurality of positioning satellites and receives the radio waves transmitted from the positioning satellites. And, the GNSS receiver 35 calculates the distance from the positioning satellites based on the difference between the transmission time and the reception time of the radio waves, and detects the current position of the vehicle 3 based on the distance from the positioning satellites and the positions (orbital information) of the positioning satellites. The output of the GNSS receiver 35, that is, the current position of the vehicle 3 detected by the GNSS receiver 35, is sent to the ECU 34. As this GNSS receiver 35, for example, a GPS receiver is used.

[0063] The storage device 36 stores data. The storage device 36 includes, for example, a hard disk drive (HDD), a solid state drive (SSD), or an optical recording medium. In the present embodiment, the storage device 36 stores map information. In the map information, in addition to information related to roads, it also includes information such as the installation position information of the on-ground power supply device 2. The ECU 34 acquires the map information from the storage device 36. In addition, the map information may not be included in the storage device 36. In this case, the ECU 34 may also acquire the map information from the outside of the vehicle 3 (e.g., a server 91 described later) via the vehicle-side first communication device 71.

[0064] The vehicle-side sensor 37 detects the state of the vehicle 3. In the present embodiment, the vehicle-side sensor 37 includes, as a sensor for detecting the state of the vehicle 3: a speed sensor for detecting the speed of the vehicle 3, a battery temperature sensor for detecting the temperature of the battery 32, a power receiving device temperature sensor for detecting the temperature of various devices of the power receiving device 5 (in particular, the power receiving side resonance circuit 51 and the power receiving side rectifier circuit 54), a battery current sensor for detecting the charging current value and the discharging current value of the battery 32, a power receiving device current sensor for detecting the current flowing through various devices of the power receiving device 5, and a power receiving device voltage sensor for detecting the voltage applied to various devices of the power receiving device 5. The output of the vehicle-side sensor 37 is input to the ECU 34.

[0065] The relay 38 is disposed between the battery 32 and the power receiving device 5 to connect and disconnect the battery 32 and the power receiving device 5. When the relay 38 is in the connected state, the power received by the power receiving device 5 is supplied to the battery 32. However, when the relay 38 is in the disconnected state, current does not flow from the power receiving device 5 to the battery 32, and thus, the power receiving device 5 cannot substantially receive power.

[0066] In addition, the power receiving device 5 may be configured to be able to supply power to the ground power supply device 2. In this case, the power receiving device 5, like the power transmission device 4 of the ground power supply device 2, has a structure for transmitting the power of the battery 32 to the ground power supply device 2. In addition, in this case, the power receiving device 5 may also utilize the resonator composed of the coil 52 and the capacitor 53 described above for supplying power to the ground power supply device 2.

[0067] <Structure of the lateral deviation detection device>

[0068] In order to perform non-contact power transmission efficiently, it is necessary that the positional deviation between the power transmission device 4 of the ground power supply device 2 and the power receiving device 5 of the vehicle 3 is small. Therefore, in the present embodiment, the non-contact power supply system 1 has a lateral deviation detection device for detecting the positional deviation (hereinafter referred to as "lateral deviation") between the power transmission device 4 and the power receiving device 5 in the direction perpendicular to the traveling direction of the vehicle 3. In particular, in the present embodiment, the lateral deviation detection device includes an alternating current magnetic field generation circuit 61 and an alternating current power generation circuit 64 provided on the vehicle 3 and a magnetic field detector 66 provided on the ground power supply device 2.

[0069] The alternating magnetic field generation circuit 61 generates an alternating magnetic field (hereinafter referred to as "alternating magnetic field for lateral displacement detection") for detecting the relative positional relationship between the power transmission device 4 (particularly, the power transmission side resonance circuit 43) and the power reception device 5 (particularly, the power reception side resonance circuit 51). The alternating magnetic field generation circuit 61 is disposed at the bottom of the vehicle 3 so as to reduce the distance from the road surface. In the present embodiment, the alternating magnetic field generation circuit 61 is disposed at the center of the vehicle 3 in the vehicle width direction, and is disposed in front of the power reception side resonance circuit 51 in the front-rear direction of the vehicle 3. In addition, the alternating magnetic field generation circuit 61 may be disposed at the same position as the power reception side resonance circuit 51 or behind the power reception side resonance circuit 51 in the front-rear direction of the vehicle 3.

[0070] The alternating magnetic field generation circuit 61 has the same structure as the power transmission side resonance circuit 43, and has a resonator composed of a coil 62 and a capacitor 63. Various parameters of the coil 62 and the capacitor 63 (the outer diameter and inner diameter of the coil 62, the number of turns of the coil 62, the static capacitance of the capacitor 63, etc.) are determined so that the resonance frequency of the alternating magnetic field generation circuit 61 becomes a predetermined set value. The predetermined set value is set to a value different from the resonance frequency of the power transmission side resonance circuit 43, that is, the resonance frequency of the magnetic field resonance coupling. In addition, the alternating magnetic field generation circuit 61 does not necessarily need to generate a magnetic field through resonance, and thus, the capacitor 63 may not be provided.

[0071] The alternating current power generation circuit 64 is electrically connected to the storage battery 32 and the alternating magnetic field generation circuit 61. The alternating current power generation circuit 64 generates alternating current power and supplies the alternating current power to the alternating magnetic field generation circuit 61. For example, the alternating current power generation circuit 64 includes an oscillation circuit and an amplifier. The oscillation circuit is composed of, for example, a converter, and converts the direct current power supplied from the storage battery 32 into alternating current power of a predetermined frequency. The amplifier amplifies the output power (alternating current power) of the oscillation circuit.

[0072] As Figure 1 shown, the alternating current power generation circuit 64 is electrically connected to the ECU 34, and the ECU 34 controls the alternating current power generation circuit 64. The alternating current power generation circuit 64 converts the direct current power supplied from the storage battery 32 into alternating current power based on an instruction from the ECU 34, and supplies the alternating current power to the alternating magnetic field generation circuit 61.

[0073] The magnetic field detector 66 detects the surrounding magnetic field. The magnetic field detector 66 is, for example, a magneto-impedance (MI) sensor. The drive power of the magnetic field detector 66 is supplied to the magnetic field detector 66 from the power supply 21 or the like via a drive circuit. In addition, the magnetic field detector 66 may be a Hall sensor, a magnetoresistive (MR) sensor, or the like.

[0074] Figure 4 FIG. 2 is a diagram showing an example of the arrangement of the magnetic field detectors 66 provided on the road 100. As Figure 4 shown, in the road where the power transmission device 4 is provided, the magnetic field detectors 66 are arranged closer to the front than the power transmission side resonance circuit 43 of the power transmission device 4 in the traveling direction of the vehicle 3. Further, a plurality of them are arranged in a direction perpendicular to the traveling direction of the vehicle 3. In particular, in the present embodiment, the plurality of magnetic field detectors 66 are separated from each other in a direction perpendicular to the traveling direction of the vehicle 3, and are arranged at equal intervals in this direction, for example. Further, the magnetic field detectors 66 are arranged in the ground (under the road surface) or on the road surface. When an alternating magnetic field for lateral deviation detection is emitted from the vehicle 3 around the magnetic field detector 66, the magnetic field detector 66 detects the alternating magnetic field for position deviation detection.

[0075] The magnetic field detector 66 is electrically connected to the controller 22, and the output of the magnetic field detector 66 is sent to the controller 22. Therefore, in the present embodiment, the output from the magnetic field detector 66 is input to the controller 22, and the controller 22 detects whether there is a lateral deviation between the power reception side resonance circuit 51 and the power transmission side resonance circuit 43, that is, whether there is a lateral deviation between the power transmission device 4 and the power reception device 5, based on this output.

[0076] In the lateral deviation detection device configured as described above, the lateral deviation in the direction perpendicular to the traveling direction of the vehicle 3 between the power reception side resonance circuit 51 and the power transmission side resonance circuit 43 is detected based on the intensity of the magnetic field detected by the plurality of arranged magnetic field detectors 66 when the vehicle 3 passes over the in-road power supply device 2. When the lateral deviation between the power reception side resonance circuit 51 and the power transmission side resonance circuit 43 is small, that is, when the vehicle 3 is traveling near the center of the lane, the intensity of the magnetic field detected by the magnetic field detector 66 arranged at the center of the lane is the strongest. On the other hand, when the lateral deviation between the power reception side resonance circuit 51 and the power transmission side resonance circuit 43 is large, that is, when the vehicle 3 is traveling deviating from the center of the lane, the intensity of the magnetic field detected by the magnetic field detector 66 arranged away from the center of the lane is the strongest. The lateral deviation detection device can detect whether there is a lateral deviation between the power reception side resonance circuit 51 and the power transmission side resonance circuit 43, that is, whether there is a lateral deviation between the power transmission device 4 and the power reception device 5, in this way.

[0077] Further, in the present embodiment, the alternating magnetic field generation circuit 61 is provided in the vehicle 3, and the magnetic field detector 66 is provided in the in-road power supply device 2. However, the alternating magnetic field generation circuit 61 may be provided in the in-road power supply device 2, and the magnetic field detector may be provided in the vehicle 3. In this case, based on the output of the magnetic field detector provided in the vehicle 3, the ECU 34 of the vehicle 3 detects whether there is a lateral deviation between the power reception side resonance circuit 51 and the power transmission side resonance circuit 43.

[0078] In addition, in the present embodiment, the lateral deviation detection device uses a magnetic field to detect the presence or absence of a lateral deviation. However, the lateral deviation detection device may also use means other than a magnetic field to detect the lateral deviation. For example, it may be a sonar using ultrasonic waves. In addition, in the present embodiment, the lateral deviation detection device detects the presence or absence of a lateral deviation, but it may also detect the lateral deviation amount of the vehicle 3 from the center of the lane. In this case, when the lateral deviation amount detected by the lateral deviation detection device is equal to or greater than a predetermined reference value, the lateral deviation detection device determines that a lateral deviation has occurred.

[0079] <Structure of Communication System>

[0080] In a non-contact power supply system 1 as shown in Figure 1 order to perform non-contact power transmission from the ground power supply device 2 to the vehicle 3, the ground power supply device 2 needs to identify the vehicle 3 traveling on the power transmission device 4, and also needs information such as the required power supply of the vehicle 3. Therefore, in order to perform this non-contact power transmission, it is necessary to send various vehicle information including vehicle identification information from the vehicle 3 to the ground power supply device 2, and the ground power supply device 2 needs to receive the vehicle information sent from the vehicle 3.

[0081] In order to identify the vehicle 3 traveling on the power transmission device 4, the ground power supply device 2 needs to receive vehicle identification information only from the vehicle 3 traveling near the ground power supply device 2. On the other hand, when the speed of the vehicle 3 is relatively high, it may be impossible to receive all the vehicle information including the required power supply from the vehicle 3 during the period when the vehicle 3 travels near the ground power supply device 2.

[0082] Thus, in the present embodiment, when the vehicle 3 has left the installation position of the ground power supply device 2 to a certain extent, the vehicle information associated with the vehicle identification information is sent from the vehicle 3 to the ground power supply device through wide area wireless communication. And when the vehicle 3 approaches the installation position of the ground power supply device 2 or when the vehicle 3 arrives at the power transmission device 4 of the ground power supply device 2, the vehicle identification information is sent from the vehicle 3 to the ground power supply device 2 through short-range wireless communication. That is, in the present embodiment, after the vehicle information is sent from the vehicle 3 to the ground power supply device 2 through wide area wireless communication in advance, the vehicle identification information is sent from the vehicle 3 to the ground power supply device 2 through short-range wireless communication.

[0083] Here, the vehicle identification information is information for identifying the vehicle 3, such as a vehicle ID. This vehicle identification information is pre-stored in the memory 342 of the ECU 34 of the vehicle 3.

[0084] In addition, the vehicle information is information of the vehicle 3 related to power transmission, including vehicle identification information. The vehicle information includes, for example, the power (or amount of power) required to receive power from the ground power supply device 2, that is, the vehicle required power (or vehicle required amount of power). The vehicle required power is calculated in the ECU 34 of the vehicle 3. In addition, the vehicle information may also include information related to the state of the vehicle, such as the state of the power receiving device 5 (connection state between the battery 32 and the power receiving device 5), the state of charge SOC of the battery 32, the temperature of the battery 32, and the allowable charging power Win. In this case, the state of charge SOC of the battery 32 is calculated in the ECU 34 based on the charging current value and discharging current value of the battery 32 detected by the vehicle-side sensor 37 (battery current sensor). In addition, the temperature of the battery 32 is detected by the vehicle-side sensor 37 (battery temperature sensor). In addition, the allowable charging power Win represents the maximum value of the charging power for avoiding the precipitation of metallic lithium on the negative electrode surface of the lithium-ion battery, and the allowable charging power Win is calculated in the ECU 34 based on the charging history of the battery 32, the state of charge SOC of the battery 32, and the temperature of the battery 32.

[0085] In addition to this, the vehicle information includes the current position information of the vehicle 3. The current position information of the vehicle 3 is calculated in the ECU 34 based on the output of the GNSS receiver 35. In addition, the vehicle information may also include various parameters of the coil 44 and the capacitor 45 of the power receiving device 5 (outer diameter and inner diameter of the coil 44, number of turns of the coil 44, static capacitance of the capacitor 45, etc.), the height of the coil 44 from the ground, and the resonance frequency of the power receiving side resonance circuit 51, which are information related to the power receiving device 5. This vehicle information is pre-stored in the memory 342 of the ECU 34 of the vehicle 3. In addition, the vehicle information may also include user information required when collecting usage fees, such as authentication information for determining the payment account of the user. This vehicle information is, for example, pre-registered by the user through the input device of the vehicle 3, or pre-registered by inserting a card with authentication information into the card reader device provided in the vehicle 3.

[0086] Figure 5 is a schematic structural diagram of a communication system used in the non-contact power supply system 1. As Figure 3 and Figure 5 shown, the vehicle 3 has a vehicle-side first communication device 71 for performing wide-area wireless communication and a vehicle-side second communication device 72 for performing short-range wireless communication. These vehicle-side first communication device 71 and vehicle-side second communication device 72 are connected to the ECU 34 via the in-vehicle network. On the other hand, as Figure 2 and Figure 5As shown in the figure, the ground power supply device 2 includes a first ground communication device 81 that performs wide-area wireless communication and a second ground communication device 82 that performs short-range wireless communication. These first ground communication device 81 and second ground communication device 82 are electrically connected to the controller 22 in a wired manner. In particular, in the present embodiment, the first vehicle-side communication device 71 and the first ground communication device 81 perform one-way or two-way communication directly or indirectly using wide-area wireless communication. In addition, the second vehicle-side communication device 72 and the second ground communication device 82 perform one-way or two-way communication directly using short-range wireless communication.

[0087] Wide-area wireless communication is communication with a longer communication distance than short-range wireless communication. Specifically, for example, it is communication with a communication distance of 10 meters to 10 kilometers. As wide-area wireless communication, various wireless communications with a longer communication distance can be used. For example, communication following any communication standard such as 4G, LTE, 5G, WiMAX, etc. established by 3GPP or IEEE can be used. As described above, in the present embodiment, vehicle information associated with vehicle identification information is sent from the vehicle 3 to the ground power supply device 2 using wide-area wireless communication.

[0088] In the present embodiment, the first vehicle-side communication device 71 of the vehicle 3 and the first ground communication device 81 of the ground power supply device 2 communicate via the server 91. Specifically, the server 91 is connected to a plurality of wireless base stations 93 via a communication network 92 composed of an optical communication line or the like. The first vehicle-side communication device 71 and the first ground communication device 81 communicate with the wireless base station 93 using wide-area wireless communication. Therefore, the first vehicle-side communication device 71 of the vehicle 3 and the first ground communication device 81 of the ground power supply device 2 communicate using wide-area wireless communication.

[0089] In addition, the first ground communication device 81 may be connected to the communication network 92 in a wired manner. Therefore, the first ground communication device 81 may be connected to the server 91 in a wired rather than wireless manner. In addition, the first vehicle-side communication device 71 may communicate with the first ground communication device 81 directly wirelessly or via the communication network without passing through the server 91. Therefore, the server 91 communicates with the vehicle 3 using wide-area wireless communication and communicates with the ground power supply device 2 in a wireless or wired manner.

[0090] Figure 6 It is a diagram schematically showing the hardware structure of the server 91. As Figure 6 shown, the server 91 includes an external communication module 911, a storage device 912, and a processor 913. In addition, the server 91 may also have an input device such as a keyboard and a mouse and an output device such as a display.

[0091] The external communication module 911 communicates with devices outside the server 91 (such as the on - ground power supply device 2, the vehicle 3, etc.). The external communication module 911 has an interface circuit for connecting the server 91 to the communication network 92. The external communication module 911 is configured to be able to communicate with multiple vehicles 3 and the on - ground power supply device 2 respectively via the communication network 92 and the radio base station 93.

[0092] The storage device 912 has a volatile semiconductor memory (e.g., RAM), a non - volatile semiconductor memory (e.g., ROM), a hard disk drive (HDD), a solid - state drive (SSD), or an optical recording medium. The storage device 912 stores computer programs for the processor 913 to execute various processes and various data used when the processor 913 executes various processes. In addition, in the present embodiment, the storage device 912 stores map information. In the map information, in addition to information related to roads, it also includes information such as the installation position information of the on - ground power supply device 2.

[0093] The processor 913 has one or more CPUs and their peripheral circuits. The processor 913 may also have an operation circuit such as a GPU, or a logical operation unit or a numerical operation unit. The processor 913 executes various arithmetic processes based on the computer programs stored in the storage device 912 of the server 91.

[0094] Short - range wireless communication refers to communication with a shorter communication distance than wide - area wireless communication. Specifically, for example, it refers to communication with a communication distance less than 10 meters. As short - range wireless communication, various short - distance wireless communications with a shorter communication distance can be used. For example, communications that follow any communication standards (e.g., Bluetooth (registered trademark), ZigBee (registered trademark)) formulated by IEEE, ISO, IEC, etc. can be used. In addition, as a technology for performing short - range wireless communication, for example, RFID (Radio Frequency Identification), DSRC (dedicated Short Range Communication), etc. are used. As described above, in the present embodiment, vehicle identification information is sent from the vehicle 3 to the on - ground power supply device 2 using short - range wireless communication.

[0095] In the present embodiment, the vehicle - side second communication device 72 of the vehicle 3 and the ground - side second communication device 82 of the on - ground power supply device 2 communicate directly through short - range wireless communication. In the present embodiment, the vehicle - side second communication device 72 sends a signal containing vehicle identification information, and the ground - side second communication device 82 receives a signal containing vehicle identification information.

[0096] The second communication device 72 on the vehicle side has an antenna that generates radio waves or a magnetic field, and a transmission circuit that supplies power or current to the antenna. The transmission circuit has an oscillation circuit, a modulation circuit, and an amplification circuit. The carrier wave generated by the oscillation circuit is modulated by the modulation circuit according to the vehicle identification information, and the alternating current (alternating power) obtained by amplifying the modulated carrier wave by the amplification circuit flows to the antenna. As a result, radio waves or a magnetic field are generated in the antenna.

[0097] The second communication device 82 on the ground side has an antenna that receives radio waves or a magnetic field, and a reception circuit that extracts information from the radio waves or magnetic field received by the antenna. The reception circuit has an amplification circuit and a demodulation circuit. The weak current generated by receiving radio waves or a magnetic field using the antenna is amplified by the amplification circuit, and the amplified signal is demodulated by the demodulation circuit to extract the information (here, the vehicle identification information) contained in the signal.

[0098] In addition, the communication between the second communication device 72 on the vehicle side and the second communication device 82 on the ground side can be performed by radio waves or by a magnetic field (i.e., by electromagnetic induction). In particular, when the frequency of the carrier wave is low (for example, 50 Hz to 50 kHz), communication is performed by a magnetic field. In this case, a coil is used as the antenna.

[0099] In addition, in the present embodiment, it is configured such that the second communication device 72 on the vehicle side transmits a signal and the second communication device 82 on the ground side receives the signal. However, the second communication device 72 on the vehicle side may also have a reception circuit so that it can perform reception in addition to signal transmission. In addition, the second communication device 82 on the ground side may also have a transmission circuit so that it can perform transmission in addition to signal reception.

[0100] In addition, in the present embodiment, the second communication device 72 on the vehicle side and the second communication device 82 on the ground side are provided in the vehicle 3 and the ground power supply device 2 as devices different from the lateral displacement detection device. However, it may be that the alternating current magnetic field generation circuit 61 of the lateral displacement detection device is used as the second communication device 72 on the vehicle side, and the magnetic field detector 66 of the lateral displacement detection device is used as the second communication device 82 on the ground side. In this case, in the alternating current magnetic field generation circuit 61, an alternating current magnetic field is generated by the alternating current modulated according to the vehicle identification information. In the magnetic field detector 66, the vehicle identification information is extracted by demodulating the alternating current generated by the detected alternating current magnetic field. Therefore, in this case, the lateral displacement is detected based on the intensity of the magnetic field detected by the magnetic field detector 66, and the vehicle identification information is extracted from the signal contained in the magnetic field detected by the magnetic field detector 66.

[0101] <Schematic process of power supply>

[0102] Next, a schematic process of control when performing contactless power transmission from the ground power supply device 2 to the vehicle 3 in the contactless power supply system 1 of the present embodiment will be described.

[0103] When performing contactless power transmission from the ground power supply device 2 to the vehicle 3, first, the ECU 34 of the vehicle 3 causes the vehicle-side first communication device 71 to send vehicle information associated with the vehicle identification information to the ground-side first communication device 81 of the ground power supply device 2. When the vehicle-side first communication device 71 sends the vehicle information associated with the vehicle identification information, the ground-side first communication device 81 of the ground power supply device 2 receives this vehicle information via wide-area wireless communication. In particular, in the present embodiment, the ground-side first communication device 81 of the ground power supply device 2 receives the vehicle information of the vehicle 3 located within a predetermined nearby area around the ground power supply device 2.

[0104] As described above, an identification information list of the vehicle identification information of the vehicle 3 that may be powered by the ground power supply device is stored in the memory 222 of the controller 22 of the ground power supply device 2. When the ground-side first communication device 81 receives the vehicle information associated with the vehicle identification information from the vehicle 3, the controller 22 of the ground power supply device 2 registers the vehicle identification information associated with this vehicle information in the identification information list. In particular, in the present embodiment, since the ground-side first communication device 81 receives the vehicle information of the vehicle 3 located within the nearby area, the vehicle identification information of the vehicle 3 located within the nearby area is registered in the identification information list.

[0105] When even one vehicle identification information of the vehicle 3 is registered in the identification information list, the controller 22 of the ground power supply device 2 causes the ground-side second communication device 82 to operate in a manner that enables communication with the vehicle-side second communication device 72, that is, in a manner that enables reception of the vehicle identification information from the vehicle-side second communication device 72 (set to the "reception standby state" described later). When the ground-side second communication device 82 is thus caused to operate, when the vehicle 3 from which a signal containing the vehicle identification information is being sent approaches, the ground-side second communication device 82 can receive the signal containing the vehicle identification information sent by the vehicle-side second communication device 72.

[0106] In addition, when vehicle identification information is registered in the identification information list, the controller 22 of the ground power supply device 2 causes the first communication device 81 on the ground side to send a notification indicating that the vehicle identification information has been registered in the identification information list to the vehicle 3 determined by the vehicle identification information. In addition, as described above, when vehicle identification information is registered in the identification information list, the second communication device 82 on the ground side operates. Therefore, the notification indicating that the vehicle identification information has been registered in the identification information list can be said to be a notification indicating that the second communication device 82 on the ground side operates or is operating in such a manner that the ground power supply device 2 can receive the vehicle identification information by short-range wireless communication.

[0107] When the first communication device 71 on the vehicle side receives, via wide-area wireless communication, a notification indicating that the vehicle identification information has been registered in the identification information list from the first communication device 81 on the ground side, when the vehicle 3 approaches the ground power supply device 2, the ECU 34 of the vehicle 3 supplies power to the second communication device 72 on the vehicle side to operate it in such a manner that a signal containing the vehicle identification information can be sent to the second communication device 82 on the ground side of the ground power supply device 2. Otherwise, it supplies power to the power receiving device 5 to operate it in such a manner that power can be received from the ground power supply device 2 when the vehicle 3 travels above the ground power supply device 2 (the "power receiving activation, signal sending state" described later).

[0108] In a state where the second communication device 72 on the vehicle side operates to send a signal containing the vehicle identification information and the second communication device 82 on the ground side operates in such a manner that communication with the second communication device 72 on the vehicle side is possible, when the vehicle 3 approaches the ground power supply device 2, the second communication device 82 on the ground side receives the signal containing the vehicle identification information sent from the second communication device 72 on the vehicle side of the vehicle 3.

[0109] When the second communication device 82 on the ground side receives the vehicle identification information, the controller 22 of the ground power supply device 2 compares the received vehicle identification information with the identification information list. And when the received vehicle identification information is registered in the identification information list, power is supplied to the power transmission side resonance circuit 43 in such a manner that power can be transmitted to the vehicle 3 when the vehicle 3 travels above the ground power supply device 2 (set as the "power transmission activation state" described later). When power is supplied to the power transmission side resonance circuit 43 of the ground power supply device 2 in this way and the power receiving device 5 of the vehicle 3 operates, and when the vehicle 3 moves and the power receiving side resonance circuit 51 of the vehicle 3 is located on the power transmission side resonance circuit 43 of the ground power supply device 2, power supply from the ground power supply device 2 to the vehicle 3 is performed. Then, when the vehicle 3 moves and the power receiving device 5 of the vehicle 3 leaves the power transmission device 4 of the ground power supply device 2, the power supply ends.

[0110] As described above, in the present embodiment, when receiving power from the ground power supply device 2, the ECU 34 of the vehicle 3 causes the vehicle-side first communication device 71 to transmit vehicle information associated with the vehicle identification information to the ground-side first communication device 81 of the ground power supply device 2. In addition to this, after the vehicle-side first communication device 71 transmits the vehicle information, the ECU 34 causes the vehicle-side second communication device 72 to transmit the vehicle identification information to the ground-side second communication device 82 of the ground power supply device 2. As a result, the ground power supply device 2 only needs to receive the vehicle identification information via short-range wireless communication during the period when the vehicle 3 is traveling near the ground power supply device 2, and does not need to receive other vehicle information via short-range wireless communication. Therefore, even if the speed of the vehicle 3 is slightly faster, the required information can be transmitted to the ground power supply device 2.

[0111] <Communication using wide-area wireless communication>

[0112] Next, with reference to Figures 7 - 10 the communication among the vehicle 3, the server 91, and the ground power supply device 2 using wide-area wireless communication and the operations of the vehicle 3, the server 91, and the ground power supply device 2 related to this communication will be described. Figure 7 is a sequence diagram of operations related to the communication among the vehicle 3, the server 91, and the ground power supply device 2 using wide-area wireless communication.

[0113] As Figure 7 shown, the ECU 34 of the vehicle 3 acquires vehicle information and causes the vehicle-side first communication device 71 to transmit the acquired vehicle information to the server 91 via wide-area wireless communication (step S11). As described above, the vehicle information includes: vehicle identification information, various parameters of the power receiving device 5, the current position information of the vehicle 3, the vehicle required power, and other information of the vehicle 3 related to power transmission. The ECU 34 acquires the vehicle identification information and various parameters of the power receiving device 5 from the memory 342, and acquires the current position information of the vehicle 3 from the GNSS receiver 35. In addition, the ECU 34 calculates the vehicle required power based on various states of the vehicle 3. Specifically, the higher the state of charge SOC of the storage battery 32, the smaller the vehicle required power set by the ECU 34, and the higher the temperature of the storage battery 32, the smaller the vehicle required power set by the ECU 34.

[0114] In addition, the ECU 34 of the vehicle 3 causes the vehicle-side first communication device 71 to transmit vehicle information at every predetermined time interval. This time interval is always constant. Alternatively, this time interval may also vary according to the situation. In this case, specifically, this time interval is set such that, for example, the shorter the distance from the current position of the vehicle 3 acquired from the GNSS receiver 35 to the installation position of the ground power supply device 2 stored in the storage device 36, the shorter it is.

[0115] When the server 91 receives vehicle information from a plurality of vehicles 3 capable of communicating with the server 91, it determines the vehicle identification information of the vehicles 3 located in the vicinity of each of the on-ground power supply devices 2 based on the current position information of each vehicle 3 included in the vehicle information (step S12). Specifically, the server 91 determines the vehicle identification information of the vehicles 3 located in a predetermined vicinity around each of the on-ground power supply devices 2 based on the current position information of each vehicle 3 included in the vehicle information received from each vehicle 3 and the installation position information of each of the on-ground power supply devices 2 stored in the storage device 912 of the server 91.

[0116] The above-mentioned "vicinity" is, for example, set as an area within a predetermined distance (e.g., 500 m) from the target on-ground power supply device 2. Alternatively, the above-mentioned "vicinity" may be set as an area within a predetermined first distance from the target on-ground power supply device 2 with respect to the lane on which the vehicle 3 traveling to the on-ground power supply device 2 is located and within a predetermined second distance shorter than the first distance from the target on-ground power supply device 2 with respect to the lane on which the vehicle 3 leaving the on-ground power supply device 2 is located.

[0117] In addition, the above-mentioned "vicinity" may also be an area that becomes larger as the speed of the vehicle 3 increases. Specifically, for example, when a certain area is set as the "predetermined area" for a vehicle 3 with a speed below a predetermined reference speed, for a vehicle with a speed faster than the predetermined reference speed, an area that includes the above-mentioned certain area and is larger than the above-mentioned certain area is set as the "vicinity". In this case, the faster the speed of the vehicle 3, the longer the distance from the current position of the vehicle 3 to the installation position of the on-ground power supply device 2 when the vehicle information is transmitted from the vehicle-side first communication device 71 of the vehicle 3 to the on-ground power supply device 2 via the server 91.

[0118] The server 91 determines the vehicle identification information of the vehicles 3 located in the vicinity of each of the on-ground power supply devices 2 at predetermined time intervals. This time interval is preferably of the same order as the shortest time interval for the ECU 34 of the vehicle 3 to send vehicle information to the server 91.

[0119] When the server 91 determines the vehicle identification information of the vehicles 3 located in the vicinity of each of the on-ground power supply devices 2, it sends the vehicle information of the vehicles 3 associated with the determined vehicle identification information to each of the on-ground power supply devices 2 via the communication network 92 (step S13). Therefore, the vehicle information of the vehicles 3 located in the vicinity around each on-ground power supply device 2 is sent from the server 91 to each on-ground power supply device 2. In the vehicle information sent at this time, in addition to the vehicle identification information, it also includes the information required for the on-ground power supply device 2 to supply power to the vehicle 3.

[0120] When the first above-ground communication device 81 of the above-ground power supply device 2 receives vehicle information from the server 91, the controller 22 of the above-ground power supply device 2 registers and erases the vehicle identification information with respect to the identification information list based on the vehicle identification information associated with the received vehicle information (step S14). Specifically, in the present embodiment, the controller 22 registers and erases the vehicle identification information with respect to the identification information list so that the vehicle identification information associated with the received vehicle information is registered in the identification information list exactly as it is.

[0121] After the controller 22 of the above-ground power supply device 2 registers and erases the vehicle identification information with respect to the identification information list, the controller 22 causes the first above-ground communication device 81 to send the vehicle identification information registered in the identification information list to the server 91 via the communication network 92 (step S15). The controller 22 sends the vehicle identification information to the server 91 at every predetermined time interval. At this time, the controller 22 sends all the vehicle identification information registered in the identification information list. In addition, the controller 22 may also send only the vehicle identification information newly registered in the identification information list and the vehicle identification information erased from the identification information list. In this case, the controller 22 may send the vehicle identification information to the server 91 not at every predetermined time interval but whenever the vehicle identification information recorded in the identification information list changes.

[0122] When the server 91 receives the vehicle identification information registered in the identification information list from the above-ground power supply device 2, the server 91 sends a notification (hereinafter referred to as "list registration notification") indicating that the vehicle identification information has been registered in the identification information list to the vehicle 3 corresponding to the vehicle identification information registered in the identification information list (step S16). In the present embodiment, the list registration notification is sent at every certain time interval. The list registration notification may also include the identification information or the installation position information of the above-ground power supply device 2 in which the vehicle identification information is registered. As a result, when the vehicle identification information of the vehicle 3 is registered in the identification information list of any above-ground power supply device 2, the list registration notification is sent to the vehicle 3. On the other hand, when the vehicle identification information of the vehicle 3 is not registered in the identification information list of all the above-ground power supply devices 2, the list registration notification is not sent to the vehicle 3. Therefore, each vehicle 3 can always grasp whether its own vehicle identification information is registered in any above-ground power supply device 2. In addition, when only the newly registered or erased vehicle identification information is received from the server 91, the server 91 sends a notification indicating that the vehicle identification information has been registered in the identification information list or erased to the vehicle 3 corresponding to the vehicle identification information.

[0123] In Figure 7In the action sequence diagram shown, the registration / erasure of the vehicle identification information with respect to the identification information list of the on-ground power supply device 2 is determined only based on whether the vehicle 3 is in the vicinity of the on-ground power supply device 2. Therefore, the vehicle identification information of the vehicle 3 is basically erased from the identification information list of the on-ground power supply device 2 when the vehicle 3 drives out of the vicinity of the on-ground power supply device 2. However, the registration / erasure of the vehicle identification information with respect to the identification information list of the on-ground power supply device 2 can also be performed based on other factors. Specifically, for example, when the power supply from a certain on-ground power supply device 2 to the vehicle 3 ends, the vehicle identification information of the vehicle 3 can be erased from the identification information list of the on-ground power supply device 2. In addition, the vehicle identification information of the vehicle 3 can also be erased from the identification information list of the on-ground power supply device 2 when the vehicle 3 requests the erasure of the vehicle identification information from the identification information list of a specific on-ground power supply device 2.

[0124] Figure 8 is the same action sequence diagram related to the communication between the vehicle 3 using wide-area wireless communication, the server 91, and the on-ground power supply device 2. In particular, Figure 7 shows the actions after the power supply from the on-ground power supply device 2 to the vehicle 3 ends. Figure 8

[0125] After the power reception of the vehicle 3 from the on-ground power supply device 2 ends (step S21), the ECU 34 of the vehicle 3 causes the vehicle-side first communication device 71 to send power reception end information to the server 91 (step S22). The power reception end information includes information related to the power reception from the on-ground power supply device 2. Specifically, the power reception end information includes, for example, the vehicle identification information of the vehicle 3, the received power from the on-ground power supply device 2, the power reception efficiency, and the abnormal detection results related to the power reception of the vehicle 3 during and before and after the power reception. In addition, in addition to this, the power reception end information can also include the power reception period (for example, the start time and end time), the amount of received power from the on-ground power supply device 2, etc. The values of various parameters included in the power reception end information are calculated in the ECU 34 based on the output of the vehicle-side sensor 37 during the power reception from the on-ground power supply device 2, etc.

[0126] ​In addition, after the power transmission from the ground power supply device 2 to the vehicle 3 ends (step S23), the controller 22 of the ground power supply device 2 causes the ground-side first communication device 81 to send a power transmission end message to the server 91 (step S24). The power transmission end message includes information related to the power transmission to the vehicle 3. Specifically, the power transmission end message includes, for example, the identification information of the ground power supply device 2, the vehicle identification information of the vehicle 3, the power transmitted to the vehicle 3, the power transmission efficiency, and the abnormal detection results related to the power transmission to the vehicle 3 during and before and after the power transmission. In addition, in addition to this, the power transmission end message may also include the power transmission period (for example, the start time and the end time), the power amount transmitted to the vehicle 3, etc. The values of various parameters included in the power transmission end message are calculated in the controller 22 based on the output of the ground-side sensor 23 during the power transmission to the vehicle 3, etc.

[0127] When the server 91 receives the power reception end message and the power transmission end message for the same vehicle 3 during the same period from the vehicle 3 and the ground power supply device 2 respectively, it performs a power supply end process for the corresponding power supply from the ground power supply device 2 to the vehicle 3 (step S25). In the power supply end process, based on the power reception end message and the power transmission end message, the calculation of the power amount supplied from the ground power supply device 2 to the vehicle 3, the charging process for the user of the vehicle 3 based on the calculated power amount supplied, the abnormal diagnosis of the power transmission device 4 of the ground power supply device 2 and the power reception device 5 of the vehicle 3, etc. are performed. The power amount supplied from the ground power supply device 2 to the vehicle 3 is calculated, for example, based on the time change of the power received by the ground power supply device 2 and the power transmitted to the vehicle 3. In addition, in the charging process for the user of the vehicle 3, for example, the payment account of the user is charged corresponding to the power amount supplied from the ground power supply device 2 to the vehicle 3. In addition, in the abnormal diagnosis of the power transmission device 4 and the power reception device 5, for example, when there is a large difference between the power received included in the power reception end message and the power transmitted included in the power transmission end message, it is diagnosed that the power transmission device 4 or the power reception device 5 is abnormal.

[0128] In addition, the power supply end process is performed whenever the power supply from one ground power supply device 2 to the vehicle 3 ends (therefore, whenever the power reception device 5 of the vehicle 3 passes over one power transmission device 4). Therefore, in the power supply end process, the calculation of the power amount supplied, etc. for the power supply from one ground power supply device 2 to the vehicle 3 is performed. However, the power supply end process may also be performed whenever the power supply from multiple ground power supply devices 2 to the vehicle 3 ends (therefore, whenever the power reception device 5 of the vehicle 3 passes over multiple power transmission devices 4). In this case, in the power supply end process, the total power amount supplied to the vehicle 3 from the multiple ground power supply devices 2, etc. is calculated.

[0129] Irrespective of the power supply end process, related to Figure 7Similarly to step S11 in [reference], vehicle information is sent from vehicle 3 to server 91 (step S26). Figure 7 Similarly to step S12 in [reference], server 91 determines the vehicle identification information of vehicle 3 located in the vicinity of each on-ground power supply device 2 based on the vehicle information (step S27). And when the power supply termination process for a certain vehicle 3 has been performed in a certain on-ground power supply device 2, server 91 deletes the vehicle identification information of the vehicle 3 for which the power supply termination process has been performed from the vehicle identification information of vehicle 3 in the vicinity of the on-ground power supply device 2 determined in step S27 (step S28).

[0130] Then, server 91 sends the vehicle information associated with the vehicle identification information of vehicle 3 determined to be in the vicinity of each on-ground power supply device 2 and not deleted in step S28 to each on-ground power supply device 2 (step S29). When the vehicle information is sent to each on-ground power supply device 2, the controller 22 of the on-ground power supply device 2 Figure 7 performs the registration and erasure of vehicle identification information with respect to the identification information list in the same manner as step S14 in [reference] (step S30). Then, Figure 7 similarly to step S15 in [reference], the vehicle identification information registered in the identification information list is sent (step S31), and Figure 7 similarly to step S16 in [reference], a list registration notice is sent (step S32).

[0131] Alternatively, when server 91 receives a request to erase the vehicle identification information of the vehicle 3 from the identification information list of a specific on-ground power supply device 2 from vehicle 3 (for example, refer to Figure 14 the "identification information erasure request" described later, etc.), the vehicle identification information of the vehicle 3 is deleted from the vehicle identification information of vehicle 3 in the vicinity of the on-ground power supply device 2 in the same manner as step S28.

[0132] As a result, when the process shown in Figure 8 is performed, the vehicle identification information of vehicle 3 located in the vicinity of each on-ground power supply device 2, whose power supply from the on-ground power supply device 2 has not ended and for which no identification information erasure has been requested, is registered in the identification information list. And vehicle 3 receives a list registration notice when the vehicle identification information of vehicle 3 is registered in the identification information list of any on-ground power supply device 2.

[0133] Figure 9 It is a flowchart showing the process flow of communication related to the use of wide-area wireless communication in server 91. Figure 9 The process shown in [reference] is executed at regular time intervals by the processor 913 of server 91.

[0134] First, the processor 913 of the server 91 acquires various information received from the vehicle 3 and the ground power supply device 2 (step S41). The various information includes the power reception end information associated with the vehicle information and the vehicle identification information, which is received from each vehicle 3 and stored in the storage device 912 of the server 91. In addition, the various information includes the power transmission end information associated with the vehicle identification information, which is received from each ground power supply device 2 and stored in the storage device 912 of the server 91.

[0135] Next, the processor 913 of the server 91 determines whether the power reception end information and the power transmission end information associated with the same vehicle identification information are respectively received from the vehicle 3 and the ground power supply device 2 (step S42). When it is determined in step S42 that the corresponding power reception end information and power transmission end information are received, the processor 913 of the server 91 executes the above-mentioned power supply end process (step S43). On the other hand, when it is determined in step S42 that the corresponding power reception end information and power transmission end information are not received, step S43 is skipped.

[0136] Next, the processor 913 of the server 91 determines the vehicle identification information of the vehicle 3 located in the vicinity area of each ground power supply device 2 based on the vehicle information (especially, the current position information) of the vehicle 3 obtained in step S41 and the installation position information of each ground power supply device 2, etc. (step S44). The vicinity area of each ground power supply device 2 is, for example, pre-stored in the storage device 912 of the server 91.

[0137] Next, when the power supply end process for a certain vehicle 3 has been performed in a certain ground power supply device 2, the processor 913 of the server 91 deletes the vehicle identification information of the vehicle 3 for which the power supply end process has been performed from the vehicle identification information of the vehicle 3 located in the vicinity area of the ground power supply device 2 determined in step S44 (step S45). Then, the processor 913 of the server 91 transmits the vehicle information associated with the vehicle identification information of the vehicle 3 located in the vicinity area of each ground power supply device 2 and not deleted in step S45 to each ground power supply device 2 (step S46).

[0138] Figure 10 It is a flowchart showing the process flow related to communication using wide area wireless communication in the ground power supply device 2. Figure 10 The shown process is executed in the processor 223 of the controller 22 of the ground power supply device 2 each time the ground side first communication device 81 of the ground power supply device 2 receives the vehicle information associated with the vehicle identification information from the server 91.

[0139] When the first communication device 81 on the ground side receives vehicle information associated with the vehicle identification information of the vehicle 3 located in the vicinity of the ground power supply device 2 (step S51), the processor 223 compares the vehicle identification information included in the received vehicle information with the vehicle identification information in the identification information list stored in the memory 342 (step S52).

[0140] Then, the processor 223 newly registers in the identification information list the vehicle identification information that is not yet registered in the identification information list among the vehicle identification information included in the received vehicle information as a result of comparing the vehicle identification information in step S52 (step S53). In addition, the processor 223 erases from the identification information list the vehicle identification information that is included in the vehicle identification information registered in the identification information list but not included in the vehicle identification information included in the vehicle information received from the server 91 (step S54). As a result, in the identification information list, the vehicle identification information of the vehicle 3 located in the vicinity of each ground power supply device 2 is always registered. Then, the processor 223 causes the first communication device 81 on the ground side to send the vehicle identification information registered in the identification information list to the server 91 via the communication network 92 (step S55).

[0141] <Status and Actions of Vehicles and Ground Power Supply Devices Related to Power Supply>

[0142] Next, refer to Figures 11 - 15 to describe the status and actions of the vehicle 3 and the ground power supply device 2 related to the power supply from the ground power supply device 2 to the vehicle 3.

[0143] First, refer to Figure 11 to describe a rough progression of the actions and status of the vehicle 3 and the ground power supply device 2 when performing power supply from the ground power supply device 2 to the vehicle 3. Figure 11 is a diagram schematically showing the progression of the actions and status of the vehicle 3 and the ground power supply device 2 when the vehicle 3 approaches the ground power supply device 2 for power supply. In addition, in the example shown in Figure 11 , for simplicity of explanation, the progression in the case where there is only one vehicle 3 and only one ground power supply device 2 is shown. In addition, in Figure 11 , a rectangle represents the status of the vehicle 3 or the ground power supply device 2, and a rounded quadrilateral represents the action of the vehicle 3 or the ground power supply device 2.

[0144] In Figure 11 In the example shown, in the initial state, the vehicle 3 is quite far from the ground power supply device 2 and is located outside the vicinity of the ground power supply device 2. Therefore, the vehicle identification information of the vehicle 3 is not registered in the identification information list of the ground power supply device 2. Therefore, no list registration notice is sent to the vehicle 3 either.

[0145] In this state, power supply from the ground power supply device 2 to the vehicle 3 does not start currently. Therefore, the state of the vehicle 3 is set to a sleep state in which only standby power is supplied to the devices related to power reception and no power is supplied to the vehicle-side second communication device 72 (step S61). In addition, the state of the ground power supply device 2 is also set to a sleep state in which only standby power is supplied and no power is supplied to the ground-side second communication device 82 (step S81).

[0146] Then, when the vehicle 3 enters the vicinity area of the ground power supply device 2, as described above, the vehicle identification information of the vehicle 3 is registered in the identification information list of the ground power supply device 2 (step S82). In addition, along with this, the vehicle 3 receives a list registration notification notifying that the vehicle identification information is registered in the identification information list of the ground power supply device 2 (step S62).

[0147] When the vehicle identification information is registered in the identification information list of the ground power supply device 2, the state of the ground power supply device 2 is set to a reception standby state in which power is supplied to the ground-side second communication device 82. In the reception standby state, when a signal is sent from the vehicle-side second communication device 72 at a distance relatively close to the ground-side second communication device 82, the ground-side second communication device 82 can receive the signal. In addition, when the vehicle 3 receives the list registration notification, the state of the vehicle 3 is set to a power reception activation and signal transmission state in which working power is supplied to the devices related to power reception of the vehicle 3, power is supplied to the vehicle-side second communication device 72, and a signal including the vehicle identification information of the vehicle 3 is sent. In the power reception activation and signal transmission state, when the power reception side resonance circuit 51 of the power reception device 5 of the vehicle 3 is located on the power transmission side resonance circuit 43 of the power transmission device 4 of the ground power supply device 2, the power reception side resonance circuit 51 can receive power from the power transmission side resonance circuit 43.

[0148] Then, when the vehicle 3 approaches the ground power supply device 2 and the ground-side second communication device 82 can receive the signal sent from the vehicle-side second communication device 72 (step S64), a signal including the vehicle identification information is sent from the vehicle-side second communication device 72 to the ground-side second communication device 82, and the ground-side second communication device 82 receives the signal sent from the vehicle-side second communication device 72 (step S84).

[0149] Since the communication range in short-range wireless communication is small, the signal received by the second communication device 82 on the ground side from the second communication device 72 on the vehicle side indicates that the vehicle 3 determined by the received vehicle identification information has reached near the ground power supply device 2. Therefore, in the present embodiment, when the second communication device 82 on the ground side receives a signal including vehicle identification information, the state of the ground power supply device 2 is set to the power transmission activation state (step S85). In the power transmission activation state, weak power is supplied to the power transmission side resonance circuit 43 of the ground power supply device 2.

[0150] Then, in a state where the state of the vehicle 3 is set to the power reception activation state and the state of the ground power supply device 2 is set to the power transmission activation state, when the power reception side resonance circuit 51 of the vehicle 3 approaches and is located on the power transmission side resonance circuit 43 of the ground power supply device 2 (step S65), magnetic field resonance coupling is generated between the power transmission side resonance circuit 43 and the power reception side resonance circuit 51, and the current flowing through the power transmission side resonance circuit 43 of the ground power supply device 2 increases. When the current flowing through the power transmission side resonance circuit 43 increases in this way, the state of the ground power supply device 2 is set to the formal power transmission state in which a larger amount of power is supplied to the power transmission side resonance circuit 43 (step S86). At this time, strong magnetic field resonance coupling is generated between the power transmission side resonance circuit 43 and the power reception side resonance circuit 51, whereby power is supplied from the power transmission side resonance circuit 43 to the power reception side resonance circuit 51, and thus power is supplied from the ground power supply device 2 to the vehicle 3.

[0151] Then, when the vehicle 3 moves and the power reception side resonance circuit 51 of the vehicle 3 leaves the power transmission side resonance circuit 43 of the ground power supply device 2 (step S66), the magnetic field resonance coupling generated between the power transmission side resonance circuit 43 and the power reception side resonance circuit 51 becomes weak, and the current flowing through the power transmission side resonance circuit 43 of the ground power supply device 2 decreases. When the current flowing through the power transmission side resonance circuit 43 decreases in this way, the power supplied to the power transmission side resonance circuit 43 decreases, and the state of the ground power supply device 2 returns to the power transmission activation state (step S87).

[0152] Then, when the vehicle 3 moves further away from the power transmission side resonance circuit 43 of the in-ground power supply device 2 and the magnetic resonance coupling between the power transmission side resonance circuit 43 and the power reception side resonance circuit 51 disappears, power reception end processing is performed in the vehicle 3 (step S67). In the power reception end processing, the values of the parameters constituting the power reception end information are calculated, and the calculated power reception end information is transmitted from the vehicle 3 to the server 91. In addition, at this time, power transmission end processing is performed in the in-ground power supply device 2 (step S88). In the power transmission end processing, the values of the parameters constituting the power transmission end information are calculated, and the calculated power transmission end information is transmitted from the in-ground power supply device 2 to the server 91. In the in-ground power supply device 2, when the power transmission end processing is performed, the supply of current to the power transmission side resonance circuit 43 is stopped, whereby the state of the in-ground power supply device 2 is set again to the reception standby state (step S89).

[0153] Then, when the vehicle 3 exits the vicinity of the in-ground power supply device 2, as described above, the vehicle identification information of the vehicle 3 is erased from the identification information list of the in-ground power supply device 2 (step S90). In addition, along with this, the vehicle 3 no longer receives the list registration notification notifying that the vehicle identification information is registered in the identification information list of the in-ground power supply device 2 (step S68). When the vehicle identification information of the vehicle 3 is erased from the identification information list, there is no longer a vehicle 3 that needs power supply near the in-ground power supply device 2, so the state of the in-ground power supply device 2 returns to the sleep state (step S91). In addition, when the vehicle 3 no longer receives the list registration notification, there is no in-ground power supply device 2 near the vehicle 3, so the state of the vehicle 3 also returns to the sleep state (step S69).

[0154] <Transition of the state and operation of the in-ground power supply device>

[0155] Next, with reference to Figure 12 and Figure 13 the transition of the state and operation of the in-ground power supply device 2 will be described. Figure 12 and Figure 13 are diagrams schematically showing the transition of the state and operation of the in-ground power supply device 2. In particular, Figure 12 shows the transition of the state and operation when the vehicle 3 is not located near the in-ground power supply device 2, specifically showing the transition of the state and operation between the sleep state and the reception standby state. On the other hand, Figure 13 shows the transition of the state and operation when the vehicle 3 is located near the in-ground power supply device 2, specifically showing the transition of the state and operation among the reception standby state, the power transmission activation state, the formal power transmission state, and the standby state. In addition, in Figure 12 and Figure 13 as well, the rectangle represents the state of the in-ground power supply device 2, and the rounded quadrilateral represents the operation of the in-ground power supply device 2.

[0156] When the state of the ground power supply device 2 is Figure 12 in the sleep state (A11) shown. Figure 11 In the state of steps S81 and S91), only standby power is supplied to the ground power supply device 2. Therefore, at this time, only the minimum required standby power is supplied to the controller 22 of the ground power supply device 2, and no power is supplied to other devices related to power transmission to the vehicle 3. For example, no power is supplied to the power transmission side resonance circuit 43, the ground side second communication device 82, the ground side sensor 23, and the magnetic field detector 66. In addition, only a small amount of power is supplied to the controller 22. Therefore, when the state of the ground power supply device 2 is in the sleep state, the power consumption of the devices related to power transmission of the ground power supply device 2 is small. However, even when the state of the ground power supply device 2 is in the sleep state, power is supplied to the ground side first communication device 81. Therefore, the vehicle identification information of the vehicle 3 within the vicinity area of the ground power supply device 2 can be received from the server 91.

[0157] When the state of the ground power supply device 2 is in the sleep state (A11), in the case (C11) where the ground side first communication device 81 receives vehicle information and the vehicle identification information included in the vehicle information is registered in the identification information list, the power supply to the devices related to power transmission of the ground power supply device 2 is started, and these devices are activated and self-diagnosis (B12) of these devices is performed. Specifically, power sufficient for the controller 22 to operate fully is supplied to the controller 22, and power is supplied to the ground side second communication device 82, the ground side sensor 23, the magnetic field detector 66, etc. In addition, a self-diagnosis program is executed in the controller 22 to perform self-diagnosis of the controller 22, the ground side second communication device 82, the ground side sensor 23, etc.

[0158] When the startup and self-diagnosis of such devices are completed (C12), the state of the ground power supply device 2 becomes the reception standby state (A13). Figure 11(in the states in steps S83 and S89). When the state of the ground power supply device 2 is in the reception standby state (A13), power is supplied to the second ground-side communication device 82, and the second ground-side communication device 82 can receive signals. In addition, in the present embodiment, when the state of the ground power supply device 2 is in the reception standby state, sufficient power is also supplied to the controller 22, the ground-side sensor 23, the magnetic field detector 66, etc. Therefore, when the state of the ground power supply device 2 is in the reception standby state, when a signal is transmitted from the vehicle-side second communication device 72 at a distance relatively close to the second ground-side communication device 82, the second ground-side communication device 82 can receive the signal. On the other hand, when the state of the ground power supply device 2 is in the reception standby state (A13), power is not supplied to the power transmission-side resonance circuit 43 of the ground power supply device 2. Therefore, even if it is assumed that the power reception-side resonance circuit 51 of the vehicle 3 approaches the power transmission-side resonance circuit 43 of the ground power supply device 2, power supply from the ground power supply device 2 to the vehicle 3 is not performed. In addition, when the state of the ground power supply device 2 is in the reception standby state, power is not supplied to the power transmission-side resonance circuit 43 of the ground power supply device 2, so the power consumption of the ground power supply device 2 is not so large.

[0159] When the state of the ground power supply device 2 is in the reception standby state (A13), in the case (C13) where none of the vehicle identification information is registered in the vehicle identification information list of the ground power supply device 2, the vehicle 3 will not come near the ground power supply device 2 at present, so the state of the ground power supply device 2 returns to the sleep state (A11).

[0160] On the other hand, as Figure 13 shown, when the state of the ground power supply device 2 is in the reception standby state (A13), when the vehicle 3 approaches the ground power supply device 2, the second ground-side communication device 82 of the ground power supply device 2 receives a signal (C14) including vehicle identification information transmitted from the vehicle-side second communication device 72. When the second ground-side communication device 82 receives a signal including vehicle identification information, the vehicle identification information included in the signal is stored in the memory 222 of the controller 22 as the vehicle identification information of the vehicle 3 being powered. In addition, the vehicle identification information included in the signal is compared (B14) with the vehicle identification information registered in the identification information list stored in the memory 222.

[0161] The vehicle identification information of the vehicle 3 is previously sent to the on - ground power supply device 2 via the vehicle - side first communication device 71 and the on - ground side first communication device 81. Therefore, the vehicle identification information included in the signal transmitted from the vehicle - side second communication device 72 is basically registered in the identification information list. However, there are cases where, for example, due to a failure of the vehicle - side first communication device 71, etc., the vehicle identification information is not previously registered in the identification information list. In such a case (C19) where the vehicle identification information is not registered in the identification information list, power supply from the on - ground power supply device 2 to the vehicle 3 is not performed, and a power - supply end process (B19) for ending power supply is carried out. In addition, in a case (C19) where the end condition described later is satisfied in the comparison between the vehicle identification information included in the signal and the vehicle identification information registered in the identification information list, a power - supply end process (B19) for ending power supply is also carried out. Details of the power - supply end process will be described later.

[0162] On the other hand, in a case (C15) where the vehicle identification information included in the signal received from the vehicle - side second communication device 72 is registered in the identification information list as a result of the comparison, next, the lateral offset detection device detects whether there is a lateral offset between the power - transmission - side resonant circuit 43 and the power - reception - side resonant circuit 51 (B15). When a lateral offset occurs between the power - transmission - side resonant circuit 43 and the power - reception - side resonant circuit 51, the power - supply efficiency between them decreases. Thus, in a case (C20) where the lateral offset detection device detects that a lateral offset has occurred between the power - transmission - side resonant circuit 43 and the power - reception - side resonant circuit 51, power supply from the on - ground power supply device 2 to the vehicle 3 is not performed, and a power - supply end process (B19) for ending power supply is carried out. In addition, in a case (C20) where the end condition described later is satisfied in the detection of the presence or absence of the lateral offset by the lateral offset detection device, a power - supply end process (B19) for ending power supply is also carried out.

[0163] On the other hand, in a case (C16) where the lateral offset detection device detects that no lateral offset has occurred between the power - transmission - side resonant circuit 43 and the power - reception - side resonant circuit 51, it is determined whether the interruption condition described later is satisfied. In a case (C18) where the interruption condition is not satisfied, the state of the on - ground power supply device 2 is switched from the reception standby state (A13) to the power - transmission activation state (A16. Figure 11 in the states in steps S85 and S87).

[0164] When the ground power supply device 2 is in the power transmission activation state (A16), the same as when in the reception standby state (A13), power is supplied to the ground-side second communication device 82, the controller 22, the ground-side sensor 23, the magnetic field detector 66, etc. In addition, at this time, weak power is supplied to the power transmission-side resonance circuit 43 of the ground power supply device 2. By supplying weak power to the power transmission-side resonance circuit 43, when the power reception-side resonance circuit 51 of the vehicle 3 approaches and is located on the power transmission-side resonance circuit 43 of the ground power supply device 2, magnetic field resonance coupling is generated between the power transmission-side resonance circuit 43 and the power reception-side resonance circuit 51, and the current flowing through the power transmission-side resonance circuit 43 increases.

[0165] Therefore, when the current flowing through the power transmission-side resonance circuit 43 increases in the case (C21) where the ground power supply device 2 is in the power transmission activation state (A16), it means that the power reception-side resonance circuit 51 of the vehicle 3 has moved above the power transmission-side resonance circuit 43 of the ground power supply device 2. Thus, in this case, the state of the ground power supply device 2 is switched to the formal power transmission state (A17. Figure 11 The state in step S86 in

[0166] When the ground power supply device 2 is in the formal power transmission state (A17), the same as when in the reception standby state (A13), power is supplied to the ground-side second communication device 82, the controller 22, the ground-side sensor 23, the magnetic field detector 66, etc. In addition, at this time, in order to supply power to the vehicle 3, power larger than that in the power transmission activation state (A16) is supplied to the power transmission-side resonance circuit 43 of the ground power supply device 2. As a result, strong magnetic field resonance coupling is generated between the power transmission-side resonance circuit 43 and the power reception-side resonance circuit 51, and a relatively large amount of power is supplied from the power transmission device 4 of the ground power supply device 2 to the power reception device 5 of the vehicle 3. In particular, in this embodiment, the power supplied to the power transmission-side resonance circuit 43 at this time is set based on the required power supply included in the vehicle information associated with the vehicle identification information. Specifically, the larger the required power supply, the larger the power supplied to the power transmission-side resonance circuit 43. The required power supply changes, for example, in the power supply from the power transmission device 4 to the power reception device 5 when the speed of the vehicle 3 is relatively slow and the power reception-side resonance circuit 51 is located on the power transmission-side resonance circuit 43 for a relatively long time. In this case, the power supplied to the power transmission-side resonance circuit 43 also changes according to the change in the required power supply.

[0167] When the state of the ground power supply device 2 is in the formal power transmission state (A17), when the power receiving side resonance circuit 51 of the vehicle 3 leaves the power transmission side resonance circuit 43 of the ground power supply device 2, as described above, the current flowing through the power transmission side resonance circuit 43 of the ground power supply device 2 decreases. When the current flowing through the power transmission side resonance circuit 43 of the ground power supply device 2 decreases in this way (C22), the state of the ground power supply device 2 switches from the formal power transmission state (A17) to the power transmission activation state (A16). In addition to this, when the end condition described later is satisfied or the interruption condition described later is satisfied when the state of the ground power supply device 2 is in the formal power transmission state, the state of the ground power supply device 2 also switches to the power transmission activation state (A16). As a result, when power transmission ends because the end condition is satisfied or power transmission is interrupted because the interruption condition is satisfied, the state of the ground power supply device 2 temporarily becomes the power transmission activation state (A16), whereby a sharp drop in the power supplied to the power transmission side resonance circuit 43 to zero can be suppressed. Therefore, the load on devices such as the power transmission side resonance circuit 43 caused by a sharp drop in the power supplied to the power transmission side resonance circuit 43 to zero can be reduced.

[0168] When the interruption condition is satisfied (C23) when the state of the ground power supply device 2 is in the power transmission activation state (A16) or when the interruption condition is satisfied (C17) when no lateral offset is detected by the lateral offset detection device, the state of the ground power supply device 2 switches to the standby state (A18).

[0169] The standby state of the ground power supply device 2 is substantially the same state as the reception standby state. Therefore, when the state of the ground power supply device 2 is in the standby state (A18), sufficient power is supplied to the ground side second communication device 82, the controller 22, the ground side sensor 23, the magnetic field detector 66, etc., while no power is supplied to the power transmission side resonance circuit 43. Therefore, when the state of the ground power supply device 2 is in the standby state (A18), power supply from the ground power supply device 2 to the vehicle 3 is not performed, and, similar to the reception standby state, the power consumption is not so large.

[0170] Here, the interruption condition is a condition that requires temporarily interrupting power transmission from the ground power supply device 2 to the vehicle 3. Hereinafter, specific examples of the interruption condition will be listed. All of the interruption conditions listed below may be used, or some of the interruption conditions may not be used. In the present embodiment, when any of the following interruption conditions is satisfied, the state of the ground power supply device 2 switches to the standby state (A18).

[0171] The first interruption condition is that a lateral displacement is detected between the power transmission - side resonant circuit 43 and the power reception - side resonant circuit 51 by the lateral displacement detection device. As described above, when a lateral displacement occurs, the power supply efficiency decreases. Therefore, when a lateral displacement is detected, the power supply is aborted.

[0172] Here, as described above, when the vehicle 3 approaches the ground power supply device 2, the lateral displacement detection device also performs lateral displacement detection (B15). In this case, the power reception - side resonant circuit 51 of the vehicle 3 may be greatly displaced from the power transmission - side resonant circuit 43 of the ground power supply device 2. In contrast, when it is detected that no lateral displacement has occurred (C16) when the vehicle 3 approaches the ground power supply device 2, even if a lateral displacement occurs between the power reception - side resonant circuit 51 and the power transmission - side resonant circuit 43 later, a large lateral displacement is not likely to occur. Therefore, detecting a lateral displacement between the power reception - side resonant circuit 51 and the power transmission - side resonant circuit 43 by the lateral displacement detection device is set as an interruption condition rather than an end condition for ending power transmission. However, detecting a lateral displacement can also be set as an end condition for ending power transmission.

[0173] The second interruption condition is the interruption of communication between the ground - side first communication device 81 of the ground power supply device 2 and the server 91. Here, the ground - side first communication device 81 communicates with the server 91 regularly, for example, receiving vehicle information (especially, power supply requirements, etc.) of the vehicle 3 during power supply. And the ground power supply device 2 performs power supply to the vehicle 3 based on the received vehicle information. Therefore, when the vehicle information of the vehicle 3 can no longer be received, the ground power supply device 2 can no longer appropriately control the power supply. Therefore, when the communication is interrupted, the power supply to the vehicle 3 is temporarily interrupted.

[0174] The third interruption condition is that the temperature of the power transmission device 4 of the ground power supply device 2, especially the temperature of the power transmission - side rectifier circuit 41, the converter 42, or the power transmission - side resonant circuit 43, is above a predetermined interruption reference temperature. In order to suppress the temperature of the power transmission device 4 from becoming excessively high, when this interruption condition is satisfied, the power supply to the vehicle 3 is temporarily interrupted. The temperature of the power transmission device 4 is detected by the ground - side sensor 23 (power transmission device temperature sensor).

[0175] The fourth interruption condition is that the speed of the vehicle 3 traveling on the power transmission device 4 is above a predetermined interruption reference speed. When the speed of the vehicle 3 is above the interruption reference speed, the power supply efficiency decreases. Therefore, when this interruption condition is satisfied, the power supply to the vehicle 3 is temporarily interrupted. The speed of the vehicle 3 is calculated, for example, based on the change in the power supply power from the power transmission device 4 to the power reception device 5.

[0176] The fifth interruption condition is detecting the presence of foreign objects or living things on the road where the power transmission device 4 is buried. When there are foreign objects or living things on the power transmission device 4, the alternating magnetic field generated by the power transmission side resonance circuit 43 changes, and accordingly, the power supply efficiency may decrease. Therefore, when this interruption condition is satisfied, the power transmission to the vehicle 3 is temporarily interrupted. The foreign objects or living things on the road where the power transmission device 4 is buried are detected by the ground side sensor 23 (foreign object sensor, living thing sensor).

[0177] The sixth interruption condition is that the power (or current, voltage) supplied to the power transmission side resonance circuit 43 of the power transmission device 4 is equal to or higher than a predetermined interruption reference value. When the power supplied to the power transmission side resonance circuit 43 becomes excessively large, it is possible that an abnormality has occurred in the power transmission side resonance circuit 43. Therefore, when this interruption condition is satisfied, the power transmission to the vehicle 3 is temporarily interrupted. The power supplied to the power transmission side resonance circuit 43 is calculated based on the output of the ground side sensor 23 (power transmission device current sensor, power transmission device voltage sensor).

[0178] When none of the above interruption conditions are satisfied (C24) while the state of the ground power supply device 2 is in the standby state (A18), the state of the ground power supply device 2 is switched to the power transmission activation state (A16).

[0179] When the end condition is satisfied (C25) while the state of the ground power supply device 2 is in the power transmission activation state (A16), when the end condition is satisfied (C26) while the state of the ground power supply device 2 is in the standby state (A18), etc., power transmission end processing (B19 is performed. Figure 11 The operation in step S88).

[0180] In the power transmission end processing, a power transmission end message is sent from the ground side first communication device 81 of the ground power supply device 2 to the server 91. As described above, the power transmission end message includes information related to the power transmission to the vehicle 3. The values of various parameters included in the power transmission end message are calculated based on the output of the ground side sensor 23 and the like. In addition, in the power transmission end processing, the vehicle identification information of the vehicle 3 being powered, which is stored in the memory 222 of the ground power supply device 2 by the operation shown in B14, is erased from the memory 222. When the power transmission end processing is completed, the state of the ground power supply device 2 is switched to the reception standby state (A13).

[0181] Here, the end condition is a condition that requires ending the power transmission from the ground power supply device 2 to the vehicle 3. Hereinafter, specific examples of the end condition are listed. All of the end conditions listed below can be used, or some of the end conditions can be not used. In the present embodiment, when any one of the following end conditions is satisfied, power transmission end processing is performed.

[0182] The first end condition is that the vehicle 3 approaching the ground power supply device 2 is detected to have left the ground power supply device 2. When the vehicle 3 passes through the power transmission device 4 of the ground power supply device 2, no further power is transmitted from the ground power supply device 2 to the vehicle 3. Therefore, when this end condition is satisfied, the power transmission to the vehicle 3 ends. The departure of the vehicle 3 from the ground power supply device 2 is detected by any method. Specifically, for example, it is detected by no longer receiving the signal transmitted by the vehicle-side second communication device 72 by the ground-side second communication device 82. Additionally, for example, the magnetic field detector used in the lateral offset detection device can also be arranged behind the power transmission device 4 in the traveling direction of the vehicle 3, and the departure of the vehicle 3 from the ground power supply device 2 can be detected by detecting the alternating magnetic field generated by the alternating magnetic field generation circuit 61 of the vehicle 3 using this magnetic field detector.

[0183] The second end condition is that the ground-side second communication device 82 of the ground power supply device 2 receives a signal containing vehicle identification information different from that of the vehicle 3 being powered and stored in the memory 222 of the ground power supply device 2 in the operation shown in B14. In other words, the second end condition is that the ground-side second communication device 82 receives vehicle identification information of a vehicle different from the vehicle 3 being powered or the vehicle 3 whose power transmission was completed immediately before. In the case where a subsequent vehicle approaches to the extent that the ground-side second communication device 82 receives a signal containing vehicle identification information, it is necessary to avoid confusion of the power transmission information between the vehicle being powered and the subsequent vehicle. Therefore, the power transmission to the vehicle 3 ends. As described above, if the power transmission end process is performed early by the establishment of this end condition, the vehicle identification information of the vehicle 3 being powered and stored in the memory 222 of the ground power supply device 2 can be deleted from the memory 222 early. Thus, the vehicle identification information of the vehicle 3 being powered can be deleted before the start of power transmission to the subsequent vehicle.

[0184] The third end condition is that the elapsed time since the vehicle identification information of the vehicle 3 being powered was registered in the memory 222 of the ground power supply device 2 is equal to or more than a predetermined end reference time. When the elapsed time is too long, it is possible that an abnormality such as the ground power supply device 2 failing to detect the departure of the vehicle 3 has occurred. Therefore, when this end condition is satisfied, the power transmission to the vehicle 3 ends. Additionally, as long as the third end condition indicates a condition where the vehicle 3 has occupied the power transmission device of the ground power supply device 2 for a long time, it can also be other conditions. Therefore, for example, the third end condition can also be that the time during which the state of the ground power supply device 2 is in the power transmission activation state or the standby state in the elapsed time since the vehicle identification information of the vehicle 3 being powered was registered in the memory 222 is equal to or more than a predetermined time.

[0185] The fourth termination condition is that a failure has occurred in the equipment related to power transmission from the ground power supply device 2 to the vehicle 3. When a failure occurs in the ground power supply device 2, power cannot be properly supplied from the ground power supply device 2 to the vehicle 3. Therefore, when this termination condition is satisfied, the power transmission to the vehicle 3 ends. A failure of the ground power supply device 2 is detected, for example, by self-diagnosis of the equipment related to power transmission from the ground power supply device 2 to the vehicle 3 (which is also being performed in the operation represented by B12).

[0186] The fifth termination condition is that an end requirement exists from outside the non-contact power supply system 1. For example, when road construction starts near the ground power supply device 2 or a disaster occurs, an end requirement is sent from outside the non-contact power supply system 1 to the ground power supply device 2. This end requirement is sent from a system outside the non-contact power supply system 1 to the server 91, and from the server 91 to the ground-side first communication device 81.

[0187] The sixth termination condition is that the coupling coefficient between the power transmission side resonance circuit 43 of the ground power supply device 2 and the power reception side resonance circuit 51 of the vehicle 3 is equal to or greater than a predetermined reference value, or the power transmission from the ground power supply device 2 to the vehicle 3 is equal to or greater than a predetermined termination reference value. Here, in the case where the coupling coefficient is very large or the power transmission is very large, there is a possibility that an excessive current flows through the power transmission device 4 and the power reception device 5. Therefore, in the case where the coupling coefficient is equal to or greater than the reference value or the power transmission is equal to or greater than the reference value, by terminating the power transmission from the ground power supply device 2 to the vehicle 3, the excessive current flowing through the power transmission device 4 and the power reception device 5 can be suppressed. The power transmission from the ground power supply device 2 to the vehicle 3 is calculated, for example, based on the output of the ground-side sensor 23 (power transmission device current sensor and power transmission device voltage sensor).

[0188] The seventh termination condition is that the charging amount to the user of the vehicle 3 calculated based on the power transmission from the ground power supply device 2 to the vehicle 3 has become equal to or greater than a predetermined upper limit charging amount. The charging amount to the user is calculated by the controller based on the change in the power transmission during power transmission to the vehicle 3 and the cost per unit power at that time. In addition, the upper limit charging amount can be a predetermined fixed value or a value set by the user of the vehicle 3. In the case of a value set by the user, the upper limit charging amount is included in the vehicle information transmitted from the vehicle 3.

[0189] The eighth termination condition is that a power transmission stop requirement described later is received from the vehicle 3. As described later, when the termination condition or cut-off condition for suspending or cutting off the power reception of the power reception device 5 in the vehicle 3 is satisfied, a power transmission stop requirement is sent from the vehicle-side first communication device 71 of the vehicle 3. When this termination condition or cut-off condition is satisfied, power reception does not occur further in the vehicle 3. Therefore, there is no need to maintain the ground power supply device 2 in a state capable of transmitting power to the vehicle 3, and thus the power transmission to the vehicle 3 ends.

[0190] The control of the state and operation of the ground power supply device 2 is performed by the controller 22. Thus, for example, when the state of the ground power supply device 2 is in the standby state, the controller 22 determines whether the interruption condition and the end condition are satisfied based on the output of the ground-side sensor 23 or the like. And when the controller 22 determines that the interruption condition is not satisfied, the controller 22 controls the converter 42 to supply a weak current to the power transmission-side resonance circuit 43.

[0191] <Transition of the state and operation of the vehicle>

[0192] Next, with reference to Figure 14 and Figure 15 the transition of the state and operation of the vehicle 3 will be described. Figure 14 is a diagram schematically showing the transition of the state and operation of the vehicle 3. Also in Figure 14 a rectangle represents the state of the vehicle 3 and a rounded quadrilateral represents the operation of the vehicle 3.

[0193] As Figure 14 shown, the state of the vehicle 3 can take two sleep states, the first sleep state (A31) and the second sleep state (A35) ( Figure 11 the states in steps S61 and S69 in ). When the state of the vehicle 3 is in the first sleep state (A31) among them, only standby power is supplied to the devices related to the power reception of the vehicle 3. Thus, at this time, only the minimum required standby power is supplied to the ECU 34 of the vehicle 3, and no power is supplied to other devices related to the power reception from the ground power supply device 2. Therefore, for example, no power is supplied to the vehicle-side second communication device 72, the AC power generation circuit 64, and the vehicle-side sensor 37, and also only a small amount of power is supplied to the ECU 34. Therefore, when the state of the vehicle 3 is in the first sleep state (A31), the power consumption of the devices related to the power reception of the vehicle 3 is small. However, even when the state of the vehicle 3 is in the first sleep state (A31), power is supplied to the vehicle-side first communication device 71. Therefore, the vehicle-side first communication device 71 can receive from the server 91 a list registration notice indicating that the vehicle identification information of the vehicle 3 has been registered in the list of identification information of any ground power supply device 2.

[0194] In addition, in the first sleep state (A31), the relay 38 between the power reception device 5 and the battery 32 is connected. Thus, the power reception device 5 and the battery 32 are connected, and when the power reception device 5 receives power, the power is supplied to the battery 32.

[0195] When the vehicle 3 is in the first sleep state (A31), if the vehicle-side first communication device 71 receives a list registration notice indicating that the vehicle identification information of the vehicle 3 has been registered in the identification information list of any of the ground power supply devices 2 and the suspension conditions and disconnection conditions described later are not satisfied (C31), power supply to the devices related to power reception from the ground power supply device 2 of the vehicle 3 is started, and these devices are activated and self-diagnosis of these devices is performed (B32). Specifically, power sufficient for the ECU 34 to operate fully is supplied to the ECU 34, and power is also supplied to the vehicle-side second communication device 72, the AC power generation circuit 64, the vehicle-side sensor 37, etc. In addition, a self-diagnosis program is executed in the ECU 34 to perform self-diagnosis of the ECU 34, the vehicle-side second communication device 72, the AC power generation circuit 64, the vehicle-side sensor 37, etc.

[0196] When the activation and self-diagnosis of such devices are completed, the state of the vehicle 3 becomes the power reception activation state (A33) or the power reception activation and signal transmission state (A34. Figure 11 (the state in step S63 in). When the vehicle 3 is in the power reception activation state (A33) or the power reception activation and signal transmission state (A34), sufficient power is supplied to the ECU 34, the vehicle-side sensor 37, etc.

[0197] Therefore, when the vehicle 3 is in the power reception activation state (A33) or the power reception activation and signal transmission state (A34), when the power reception side resonance circuit 51 of the vehicle 3 approaches and is located on the power transmission side resonance circuit 43 of the ground power supply device 2, a strong magnetic field resonance coupling is generated between the power transmission side resonance circuit 43 and the power reception side resonance circuit 51, and a large amount of power is received from the ground power supply device 2. On the other hand, when the vehicle 3 moves and the power reception side resonance circuit 51 moves away from the power transmission side resonance circuit 43 from the state where a strong magnetic field resonance coupling is generated between the power transmission side resonance circuit 43 and the power reception side resonance circuit 51 when the vehicle 3 is in the power reception activation state (A33) or the power reception activation and signal transmission state (A34), the magnetic field resonance coupling is released and the power supply from the ground power supply device 2 to the vehicle 3 ends.

[0198] In addition, when the vehicle 3 is in the power reception activation state (A33), power is not supplied to the vehicle-side second communication device 72 and the AC power generation circuit 64. Therefore, the vehicle-side second communication device 72 cannot send a signal including the vehicle identification information of the vehicle 3. In addition, the AC power generation circuit 64 cannot generate an AC magnetic field for lateral offset detection. On the other hand, when the vehicle 3 is in the power reception activation and signal transmission state (A34), power is supplied to the vehicle-side second communication device 72 and the AC power generation circuit 64. Therefore, the vehicle-side second communication device 72 sends a signal including the vehicle identification information of the vehicle 3, and the AC power generation circuit 64 generates an AC magnetic field for lateral offset detection. Therefore, at this time, when the vehicle 3 travels near the ground power supply device 2, a signal including the vehicle identification information is sent from the vehicle-side second communication device 72 to the ground-side second communication device 82.

[0199] In addition, when the vehicle 3 is in the power reception activation state (A33), power is not supplied to the vehicle-side second communication device 72 and the AC power generation circuit 64, so the power consumption of the vehicle 3 is not so large. On the other hand, when the vehicle 3 is in the power reception activation and signal transmission state (A34), power is supplied to the vehicle-side second communication device 72 and the AC power generation circuit 64, so the power consumption is larger than that in the power reception activation state (A33).

[0200] When the vehicle 3 is in the power reception activation state (A33), in the case (C33) where all the transmission stop conditions no longer hold, the state of the vehicle 3 switches to the power reception activation and signal transmission state (A34). On the other hand, when the vehicle 3 is in the power reception activation and signal transmission state (A34), in the case (C34) where the transmission stop condition holds, the state of the vehicle 3 switches to the power reception activation state (A33).

[0201] Here, the transmission stop condition is a condition that requires temporarily stopping the transmission of the signal from the vehicle-side second communication device 72. By temporarily stopping the transmission of the signal from the vehicle-side second communication device 72, a signal including the vehicle identification information is no longer sent to the ground-side second communication device 82, and thus, power transmission from the ground power supply device 2 is no longer performed. Hereinafter, specific examples of the transmission stop condition will be listed. All the listed transmission stop conditions can be used, or some of the transmission stop conditions can be not used. In the present embodiment, when any one of the following transmission stop conditions holds, the state of the vehicle 3 is set to the power reception activation state (A33), and when none of them holds, the state of the vehicle 3 is set to the power reception activation and signal transmission state (A34).

[0202] The first transmission stop condition is that the vehicle 3 is performing other processes that cause a large amount of electric power to flow into the battery 32. When the battery 32 is being rapidly charged by a method other than non-contact power transmission, it is difficult to simultaneously supply the electric power based on non-contact power transmission to the battery 32. Therefore, a temporary stop signal is sent to temporarily stop the power transmission from the ground power supply device 2. As the above-mentioned other processes, for example, when the vehicle 3 is a hybrid vehicle also driven by an internal combustion engine, the start or stop of the internal combustion engine can be cited. This other process is detected, for example, based on the output of the vehicle-side sensor 37 provided in the vehicle 3 or the control command from the ECU 34 to the internal combustion engine or the like.

[0203] The second transmission stop condition is that the vehicle 3 is in an emergency brake. When the vehicle 3 is in an emergency brake, the battery 32 is charged by regenerative power. Therefore, it is not easy to simultaneously and efficiently supply the electric power based on non-contact power transmission to the battery 32. Therefore, a temporary stop signal is sent to temporarily stop the power transmission from the ground power supply device 2. Whether the vehicle 3 is in an emergency brake is detected, for example, based on the amount of depression of the actuator pedal of the vehicle 3.

[0204] The third transmission stop condition is that the vehicle 3 is changing lanes. When the vehicle 3 is changing lanes, even if the vehicle 3 is traveling near the ground power supply device 2, the lateral offset between the power transmission side resonance circuit 43 and the power reception side resonance circuit 51 is large. Therefore, a temporary stop signal is sent to temporarily stop the power transmission from the ground power supply device 2. Whether the vehicle 3 is changing lanes is detected, for example, based on the image captured by a front camera (not shown) or the like provided in the vehicle 3.

[0205] The fourth transmission stop condition is that the vehicle 3 approaches or exceeds the left and right lane markings. Also in this case, even if the vehicle 3 is traveling near the ground power supply device 2, the lateral offset between the power transmission side resonance circuit 43 and the power reception side resonance circuit 51 is large. Therefore, a temporary stop signal is sent to temporarily stop the power transmission from the ground power supply device 2. Whether the vehicle 3 approaches or exceeds the left and right lane markings is detected, for example, based on the image captured by a front camera (not shown) or the like provided in the vehicle 3.

[0206] The fifth transmission stop condition is that when a magnetic field detector for a lateral offset detection device is provided in the vehicle 3, a lateral offset is detected between the power transmission side resonance circuit 43 and the power reception side resonance circuit 51 by this lateral offset detection device. As described above, when a lateral offset occurs, the power supply efficiency decreases. Therefore, when a lateral offset is detected, a temporary stop signal is sent to temporarily stop the power transmission from the ground power supply device 2.

[0207] The sixth transmission stop condition is that the communication between the vehicle-side first communication device 71 of the vehicle 3 and the server 91 is interrupted for less than a certain period of time. Here, the vehicle-side first communication device 71 communicates with the server 91 regularly, for example, transmits vehicle information of the powered-on vehicle 3 (in particular, power supply requirements, etc.). And when it is no longer possible to transmit the vehicle information of the vehicle 3, it is no longer possible to appropriately control the power supply. Therefore, when the communication is interrupted, a temporary stop signal is sent to temporarily stop the power transmission from the ground power supply device 2.

[0208] In addition, when a magnetic field detector for detecting lateral offset is provided in the vehicle 3 and a magnetic field generation circuit is buried at a position somewhat closer to the front than the power transmission device 4 of the ground power supply device 2 in the traveling direction of the vehicle 3, the magnetic field detector can be used to detect that the vehicle 3 has approached the ground power supply device 2. In such a case, the situation where the power transmission device 4 of the ground power supply device 2 has not detected the approach of the vehicle 3 by the magnetic field detector of the ground power supply device 2 can also be set as a transmission stop condition (the seventh transmission stop condition). Thereby, the vehicle-side first communication device 71 can be made to perform signal transmission only when the vehicle 3 approaches the ground power supply device 2.

[0209] When the state of the vehicle 3 is in the power reception activation state (A33) or the power reception activation and signal transmission state (A34), when the vehicle-side first communication device 71 of the vehicle 3 no longer receives the list registration notification, that is, when the vehicle identification information (C35) of the vehicle 3 is no longer registered in the identification information list of all the ground power supply devices 2, the state of the vehicle 3 returns to the first sleep state (A31).

[0210] On the other hand, when the state of the vehicle 3 is in the power reception activation state (A33) or the power reception activation and signal transmission state (A34), when the suspension condition described later is satisfied and the power reception device 5 does not receive power from the power transmission device 4 of the ground power supply device 2, or when the disconnection condition described later is satisfied (C36), a request for erasing the identification information and a request for stopping power transmission are sent from the vehicle-side first communication device 71 to the server 91 and then to the corresponding ground power supply device 2.

[0211] The request for erasing the identification information is a request for erasing the vehicle identification information of the vehicle 3 from the identification information list of the corresponding ground power supply device 2. The ground power supply device 2 that is the object of the erasing request can be all the ground power supply devices 2 in which the vehicle identification information of the vehicle 3 is registered in the identification information list, or can be only the ground power supply devices 2 located near the current position of the vehicle 3. The ground power supply device 2 that has received the request for erasing the identification information erases the vehicle identification information of the vehicle 3 from the identification information list stored in the memory 222 of the ground power supply device 2.

[0212] The power supply stop request is a request to stop the power supply from the corresponding ground power supply device 2 to the vehicle 3. The ground power supply device 2 that is the object of the stop request is the ground power supply device 2 located near the current position of the vehicle 3. When receiving the power supply stop request, the ground power supply device 2 stops the power supply when it is supplying power to the vehicle 3.

[0213] By sending the identification information erasure request and the power supply stop request to the ground power supply device 2 in this way, it is not necessary to unnecessarily switch the state of the ground power supply device 2 from the sleep state (A11) to the reception standby state (A13) or the power supply activation state (A16), and the power consumption of the ground power supply device 2 can be suppressed.

[0214] When the identification information erasure request and the power supply stop request (B13) are sent from the vehicle-side first communication device 71, when the disconnection condition is satisfied (C37), the state of the vehicle 3 switches to the second sleep state (A35). In addition, when the disconnection condition is satisfied (C38) when the state of the vehicle is in the first sleep state (A31), the state of the vehicle 3 also switches to the second sleep state (A35).

[0215] When the state of the vehicle 3 is in the second sleep state (A35), standby power is supplied to the vehicle 3 in the same manner as when it is in the first sleep state (A31). However, when the state of the vehicle 3 is in the second sleep state (A35), the relay 38 is cut off. Therefore, the connection between the power receiving device 5 and the battery 32 is cut off, and the power receiving device 5 cannot substantially receive power.

[0216] When the disconnection condition no longer holds (C39) when the state of the vehicle 3 is in the second sleep state (A35), the state of the vehicle 3 switches to the first sleep state (A31).

[0217] Here, the disconnection condition is a condition that requires cutting off the power receiving device 5 and the battery 32 in addition to aborting the power reception from the ground power supply device 2 to the vehicle 3. Hereinafter, specific examples of the disconnection condition will be listed. All of the disconnection conditions listed below can be used, or some of the disconnection conditions can be not used. In the present embodiment, when any of the following disconnection conditions is satisfied, the state of the vehicle 3 is set to the second sleep state (A35).

[0218] The first cut-off condition is that the state of charge (SOC) of the storage battery 32 is equal to or higher than the charge rate limit value. The charge rate limit value is a pre-determined value at which it is difficult to further charge the storage battery 32 due to its structure, for example, 95% or higher. When the SOC of the storage battery 32 is equal to or higher than the charge rate limit value, charging of the storage battery 32 cannot be performed currently, so the connection between the power receiving device 5 and the storage battery 32 is cut off. The SOC of the storage battery 32 is calculated in the ECU 34 based on the charge current value and discharge current value of the storage battery 32 detected by the vehicle-side sensor 37 (current sensor).

[0219] The second cut-off condition is that the temperature of the storage battery 32 is equal to or higher than the battery limit temperature. The limit temperature is a temperature at which the deterioration of the storage battery 32 progresses when the temperature of the storage battery 32 becomes equal to or higher than the battery limit temperature. When the temperature of the storage battery 32 becomes equal to or higher than the battery limit temperature, charging of the storage battery 32 that would cause an increase in the temperature of the storage battery 32 cannot be performed currently, so the connection between the power receiving device 5 and the storage battery 32 is cut off. The temperature of the storage battery 32 is detected by the vehicle-side sensor 37 (battery temperature sensor).

[0220] The third cut-off condition is that the temperature of the power receiving device 5 of the vehicle 3, especially the temperature of the power receiving side resonance circuit 51 and the power receiving side rectifying circuit 54, is equal to or higher than the predetermined power receiving device limit temperature. The power receiving device limit temperature is a temperature at which the power receiving device 5 may malfunction when the temperature of the power receiving device 5 becomes further higher. When the temperature of the power receiving device 5 becomes equal to or higher than the power receiving device limit temperature, use of the power receiving device 5 that would cause an increase in the temperature of the power receiving device 5 cannot be performed currently, so the connection between the power receiving device 5 and the storage battery 32 is cut off. The temperature of the power receiving device 5 is detected by the vehicle-side sensor 37 (power receiving device temperature sensor).

[0221] The fourth cut-off condition is that the current flowing through the power receiving device 5 is equal to or higher than the current limit value or the voltage applied to the power receiving device 5 is equal to or higher than the voltage limit value. When the current flowing through the power receiving device 5 or the voltage applied to the power receiving device 5 becomes excessively large, the power receiving device 5 may malfunction, so the connection between the power receiving device 5 and the storage battery 32 is cut off. The current flowing through the power receiving device 5 and the voltage applied to the power receiving device 5 are detected by the vehicle-side sensor 37 (current sensor, voltage sensor).

[0222] The fifth disconnection condition is that the communication between the first vehicle-side communication device 71 of the vehicle 3 and the server 91 has been interrupted for a certain period of time or more. As described above, the first vehicle-side communication device 71 communicates with the server 91 regularly, for example, sending vehicle information of the powered vehicle 3 (in particular, power supply requirements, etc.). And when the vehicle information of the vehicle 3 can no longer be sent, the power supply cannot be properly controlled. In particular, when this communication has been interrupted for a certain period of time or more, it is not a temporary communication obstacle, so the connection between the power receiving device 5 and the battery 32 is disconnected.

[0223] In addition, the disconnection condition is a condition with a lower establishment frequency than the suspension condition described later. Here, when the connection and disconnection of the relay 38 to which a higher voltage is applied are repeated frequently, it becomes a cause of abnormality in the relay 38. In the present embodiment, by setting the disconnection condition for disconnecting the relay 38 to a condition with a lower establishment frequency, the occurrence of an abnormality in the relay 38 can be suppressed.

[0224] On the other hand, when a request for erasing identification information and a request for stopping power transmission are sent from the first vehicle-side communication device 71 (B13), and when the suspension condition is satisfied (C40), the state of the vehicle 3 is switched to the first sleep state (A31).

[0225] Here, the suspension condition is a condition that requires suspension of power reception from the ground power supply device 2 to the vehicle 3. Hereinafter, specific examples of the suspension condition will be listed. All of the suspension conditions listed below can be used, or some of the suspension conditions can be not used. In the present embodiment, when any of the following suspension conditions is satisfied, the state of the vehicle 3 is set to the first sleep state (A31).

[0226] The first suspension condition is that the state of charge SOC of the battery 32 is equal to or higher than the state-of-charge reference value and lower than the state-of-charge limit value. The state-of-charge reference value is a predetermined value lower than the above state-of-charge limit value, for example, 80% or more. When the state of charge SOC of the battery 32 is equal to or higher than the state-of-charge reference value, charging of the battery 32 is basically not required, so power reception from the ground power supply device 2 to the vehicle 3 is suspended.

[0227] The second suspension condition is that the temperature of the battery 32 is equal to or higher than the battery reference temperature and lower than the battery limit temperature. The battery reference temperature is a predetermined temperature lower than the above battery limit temperature. When the temperature of the battery 32 is equal to or higher than the battery reference temperature, charging of the battery 32 needs to be suppressed to prevent the temperature of the battery 32 from reaching the battery limit temperature, so power reception from the ground power supply device 2 to the vehicle 3 is suspended.

[0228] The third interruption condition is that the temperature of the power receiving device 5 of the vehicle 3, particularly the temperature of the power receiving side resonance circuit 51 or the power receiving side rectifying circuit 54, is above the predetermined power receiving device reference temperature and below the power receiving device limit temperature. The power receiving device reference temperature is a predetermined temperature lower than the above-mentioned power receiving device limit. When the temperature of the power receiving device 5 is above the power receiving device reference temperature, it is necessary to suppress the use of the power receiving device 5 to prevent the temperature of the power receiving device 5 from reaching the power receiving device reference temperature. Therefore, the power reception from the ground power supply device 2 to the vehicle 3 is interrupted.

[0229] The fourth interruption condition is that the allowable charging power of the storage battery 32 is above a predetermined charging power reference value. When the allowable charging power of the storage battery 32 is small, even if the power receiving device 5 receives power from the power transmission device 4, it may not be possible to appropriately supply this power to the storage battery. Therefore, the power reception from the ground power supply device 2 to the vehicle 3 is interrupted. The allowable charging power of the storage battery 32 is calculated based on the output of vehicle side sensors 37 (such as a storage battery temperature sensor, a storage battery current sensor, etc.).

[0230] The fifth interruption condition is that the speed of the vehicle 3 is above a predetermined interruption reference speed. When the speed of the vehicle 3 is above the interruption reference speed, the power supply efficiency decreases. Therefore, the power reception from the ground power supply device 2 to the vehicle 3 is interrupted. The interruption reference speed may also be the same as the interruption reference speed in the above-mentioned fifth interruption condition. The speed of the vehicle 3 is detected by a vehicle side sensor 37 (a speed sensor).

[0231] The sixth interruption condition is that the charging amount for the user of the vehicle 3 calculated based on the received power of the vehicle 3 receiving power from the ground power supply device 2 has exceeded a predetermined upper limit charging amount. The charging amount for the user is calculated by the ECU 34 based on the change in the received power during the power reception from the ground power supply device 2 and the cost per unit power at this time. In addition, the upper limit charging amount may be a predetermined fixed value or a value set by the user of the vehicle 3.

[0232] The seventh interruption condition is a case where there is a suspension request from the user. The suspension request from the user is output, for example, from a switch provided in the vehicle 3 for inputting the necessity of power supply during travel.

[0233] The control of the state and operation of the vehicle 3 is performed by the ECU 34. Therefore, for example, when the state of the vehicle 3 is in the second sleep state (A35), the ECU 34 determines whether the cut-off condition is satisfied based on the output of the vehicle side sensor 37, etc. And when the ECU 34 determines that the cut-off condition is not satisfied, it controls the relay 38 so that the power receiving device 5 is connected to the storage battery 32.

[0234] Next, refer to Figure 15A description will be given of the power reception end process. Figure 15 It is a flowchart showing the process of operations related to the execution of the power reception end process. The illustrated process is performed at regular time intervals.

[0235] As Figure 15 shown, first, the ECU 34 acquires the current position information and the map information (step S101). The ECU 34 acquires the current position information of the vehicle 3 from the GNSS receiver 35. In addition to this, the ECU 34 acquires the map information from the storage device 36. In particular, in the present embodiment, the ECU 34 acquires the map information including the installation position information of the ground power supply device 2 around the current position of the vehicle 3.

[0236] Next, the ECU 34 determines whether the vehicle 3 has passed above any of the ground power supply devices 2 based on the current position information and the installation position information of the ground power supply device 2 acquired in step S101 (step S102).

[0237] When it is determined in step S102 that the vehicle 3 has passed above any of the ground power supply devices 2, the ECU 34 performs the power reception end process (step S103). In the power reception end process, power reception end information is transmitted from the vehicle-side first communication device 71 to the server 91. The power reception end information includes information related to the power reception from the ground power supply device 2. The values of various parameters included in the power reception end information are calculated based on the output of the vehicle-side sensor 37 and the like. On the other hand, when it is determined in step S102 that the vehicle 3 has not passed above any of the ground power supply devices 2, step S103 is skipped.

[0238] According to the present embodiment described above, the ground power supply device 2 that supplies power to the vehicle 3 in a non-contact manner includes: a power transmission device 4 having a power transmission side resonance circuit 43 (resonance circuit) that supplies power to the vehicle 3; and a controller 22 (control device) configured to change the state of the ground power supply device 2 to the standby state when a predetermined interruption condition is satisfied when the state of the ground power supply device 2 is the formal power transmission state or the power transmission activation state, and to change the state of the ground power supply device 2 to the power transmission activation state when the interruption condition is no longer satisfied when the state of the ground power supply device 2 is the standby state.

[0239] The formal power transmission state is a state in which power is supplied to the power transmission side resonance circuit 43 to supply power to the vehicle 3, the power transmission activation state is a state in which weak power is supplied to the power transmission side resonance circuit 43 and power supply to the vehicle 3 can be achieved, the standby state is a state in which the power supply to the power transmission side resonance circuit 43 is stopped, and it is a state in which the state can be changed to the power transmission activation state by supplying weak power to the power transmission side resonance circuit 43.

[0240] Thus, according to the present embodiment, when an interruption condition for temporarily interrupting power transmission from the ground power supply device 2 to the vehicle 3 is satisfied, it is possible to transition to a standby state in which the power transmission side resonance circuit 43 can be immediately transitioned to the power transmission activation state by supplying weak power. Therefore, it is possible to quickly resume power transmission when the power transmission from the ground power supply device 2 to the vehicle 3 is interrupted.

[0241] In addition, in the present embodiment, the ground power supply device 2 includes a ground side second communication device 82 (short-range communication device) that directly communicates with the vehicle 3 using short-range wireless communication. The controller 22 (control device) is configured to transition the state of the ground power supply device 2 to the reception standby state (second standby state) when a predetermined end condition is satisfied while the state of the ground power supply device 2 is the normal power transmission state, the power transmission activation state, or the standby state.

[0242] The reception standby state is a state in which the power supply to the power transmission side resonance circuit 43 (resonance circuit) is stopped, and is a state in which, when vehicle identification information is received from the vehicle 3 through the ground side second communication device 82, the state transitions to the power transmission activation state when the vehicle identification information is registered in a list of vehicle identification information of the vehicle 3 that may be powered by the ground power supply device 2 stored in the controller 22.

[0243] Thus, according to the present embodiment, when an end condition for ending the power transmission from the ground power supply device 2 to the vehicle 3 is satisfied, it is possible to stop the power supply to the power transmission side resonance circuit 43 and suppress the power consumption of the ground power supply device 2, and immediately transition to the power transmission activation state when new vehicle identification information is received.

[0244] The embodiments of the present invention have been described above, but the above embodiments merely show a part of the application examples of the present invention, and are not intended to limit the technical scope of the present invention to the specific structures of the above embodiments.

[0245] Description of Reference Numerals

[0246] 1 Non-contact power supply system

[0247] 2 Ground power supply device

[0248] 3 Vehicle

[0249] 4 Power transmission device

[0250] 5 Power reception device

[0251] 22 Controller

[0252] 34 ECU

[0253] 71 Vehicle side first communication device

[0254] 72 Vehicle-side second communication device

[0255] 81 Ground-side first communication device

[0256] 82 Ground-side second communication device.

Claims

1. An in - ground power supply device that supplies power to a vehicle in a non - contact manner, The in - ground power supply device includes: A power transmission device having a resonance circuit that supplies power to the vehicle; and A control device configured to change the state of the in - ground power supply device to a standby state when a predetermined interruption condition is satisfied when the state of the in - ground power supply device is in a formal power transmission state or a power transmission activation state, and to change the state of the in - ground power supply device to the power transmission activation state when the interruption condition is no longer satisfied when the state of the in - ground power supply device is in the standby state, The formal power transmission state is a state in which power is supplied to the resonance circuit to supply power to the vehicle, The power transmission activation state is a state in which weak power is supplied to the resonance circuit and power supply to the vehicle can be achieved, The standby state is a state in which power supply to the resonance circuit is stopped, and is a state that can be changed to the power transmission activation state by supplying weak power to the resonance circuit, The in - ground power supply device further includes a short - range communication device that directly communicates with the vehicle using short - range wireless communication, The control device is configured to change the state of the in - ground power supply device to a second standby state when a predetermined end condition is satisfied when the state of the in - ground power supply device is in the formal power transmission state, the power transmission activation state, or the standby state, The second standby state is a state in which power supply to the resonance circuit is stopped, and is a state that changes to the power transmission activation state when vehicle identification information is received from the vehicle through the short - range communication device and the vehicle identification information is registered in a list of vehicle identification information of vehicles that may be powered by the in - ground power supply device stored in the control device.

2. The in - ground power supply device according to claim 1, Wherein, The interruption condition is a condition that temporarily interrupts power supply from the in - ground power supply device to the vehicle.

3. The in - ground power supply device according to claim 1, Wherein, The in - ground power supply device further includes a position offset detection device that detects a position offset between the power transmission device and the power reception device mounted on the vehicle in a direction perpendicular to the traveling direction of the vehicle, The interruption condition is that the position offset is detected.

4. The in - ground power supply device according to claim 1, Wherein, The in - ground power supply device further includes a communication device that communicates with a server, The interruption condition is a communication interruption between the server and the communication device.

5. The in - ground power supply device according to claim 1, Wherein, The interruption condition is that the temperature of the power transmission device is equal to or higher than a predetermined interruption reference temperature.

6. The in - ground power supply device according to claim 1, Wherein, The interruption condition is that the speed of the vehicle is equal to or higher than a predetermined interruption reference speed.

7. The in - ground power supply device according to claim 1, Wherein, The interruption condition is that there is a foreign object on the road where the in - ground power supply device is installed.

8. The in - ground power supply device according to claim 1, Wherein, The interruption condition is that there is a living being on the road where the above-ground power supply device is installed.

9. The above-ground power supply device according to claim 1, wherein, the interruption condition is that the power supplied to the resonant circuit is equal to or higher than a predetermined interruption reference value.

10. The above-ground power supply device according to claim 1, wherein, the end condition is a condition that requires ending the power transmission from the above-ground power supply device to the vehicle.

11. The above-ground power supply device according to claim 1, wherein, the end condition is detecting that the vehicle has passed the road where the above-ground power supply device is installed.

12. The above-ground power supply device according to claim 1, wherein, the end condition is that the vehicle identification information is received by the short-range communication device from other vehicles before one vehicle passes the road where the above-ground power supply device is installed.

13. The above-ground power supply device according to claim 1, wherein, the end condition is that the time in the power transmission activation state or the standby state is equal to or longer than a predetermined time.

14. The above-ground power supply device according to claim 1, wherein, the end condition is detecting a failure of the above-ground power supply device.

15. The above-ground power supply device according to claim 1, wherein, the end condition is that the coupling coefficient between the resonant circuit of the power transmission device and the resonant circuit of the power receiving device mounted on the vehicle is equal to or higher than a predetermined end reference value.

16. The above-ground power supply device according to claim 1, wherein, the end condition is that the charging amount to the user of the vehicle calculated based on the power transmitted from the above-ground power supply device to the vehicle reaches or exceeds a predetermined upper limit charging amount.

17. The above-ground power supply device according to claim 1, wherein, the end condition is that a power transmission stop request signal is received by the short-range communication device from the vehicle.

18. A control method for an above-ground power supply device, which is a control method for an above-ground power supply device that has a resonant circuit and transmits power to a vehicle in a non-contact manner. When a predetermined interruption condition is satisfied while the state of the above-ground power supply device is the formal power transmission state or the power transmission activation state, the state of the above-ground power supply device is changed to the standby state. When the interruption condition is no longer satisfied while the state of the above-ground power supply device is the standby state, the state of the above-ground power supply device is changed to the power transmission activation state. The formal power transmission state is a state in which power is supplied to the resonant circuit to transmit power to the vehicle. The power transmission activation state is a state in which weak power is supplied to the resonant circuit and power transmission to the vehicle can be achieved. The standby state is a state in which the power supply to the resonant circuit is stopped, and it is a state in which the power transmission activation state can be changed by supplying weak power to the resonant circuit. When a predetermined end condition is satisfied while the state of the above-ground power supply device is the formal power transmission state, the power transmission activation state or the standby state, the state of the above-ground power supply device is changed to the second standby state. The second standby state is a state in which power supply to the resonance circuit is stopped, and is a state that transitions to the power transmission activation state when vehicle identification information is received from the vehicle by a short-range communication device provided in the ground power supply device and directly communicating with the vehicle using short-range wireless communication, and when the vehicle identification information is registered in a list of vehicle identification information of vehicles that may be powered by the ground power supply device.

19. A non-volatile computer storage medium containing a program for causing a processor of a ground power supply device having a resonance circuit to supply power to a vehicle in a non-contact manner to perform the following steps: When a predetermined interruption condition is satisfied while the state of the ground power supply device is the formal power transmission state or the power transmission activation state, cause the state of the ground power supply device to transition to the standby state. Wherein, The formal power transmission state is a state in which power is supplied to the resonance circuit to supply power to the vehicle, the power transmission activation state is a state in which weak power is supplied to the resonance circuit to enable power supply to the vehicle, the standby state is a state in which power supply to the resonance circuit is stopped, and is a state that can transition to the power transmission activation state by supplying weak power to the resonance circuit. When the predetermined interruption condition no longer holds while the state of the ground power supply device is the standby state, cause the state of the ground power supply device to transition to the power transmission activation state. When a predetermined end condition is satisfied while the state of the ground power supply device is the formal power transmission state, the power transmission activation state, or the standby state, cause the state of the ground power supply device to transition to the second standby state, where the second standby state is a state in which power supply to the resonance circuit is stopped, and is a state that transitions to the power transmission activation state when vehicle identification information is received from the vehicle by a short-range communication device provided in the ground power supply device and directly communicating with the vehicle using short-range wireless communication, and when the vehicle identification information is registered in a list of vehicle identification information of vehicles that may be powered by the ground power supply device.

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