Control device

Abstract

The control device includes a processor configured to transmit power in a non-contact manner from a primary device of a supply facility to a secondary device of a traveling vehicle using narrow-area wireless communication and wide-area wireless communication. If the interruption time during which the wide area wireless communication is interrupted is equal to or less than a first threshold value, a magnetic coupling check for checking the magnetic coupling state between the primary device and the secondary device is switched to, and if the interruption time is greater than the first threshold value, a magnetic coupling check for checking the magnetic coupling state between the primary device and the secondary device is switched to. And transferring to a compatibility check for confirming that the primary device and the secondary device have compatibility. As a result, provided is a control device capable of quickly detecting an interruption of wide-area wireless communication and quickly resuming processing while ensuring security.

Description

Technical Field

[0001] The present disclosure relates to a control device. Background Art

[0002] Patent document 1 discloses the following technology: in a contactless power supply system that can transmit information between a power transmitting device and a power receiving device by wireless communication, a communication unit that performs wireless communication switches the communication range between a wide communication range (wide area (long-range) communication) and a narrow communication range (narrow area (short-range) communication).

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2013-240132 Summary of the Invention

[0006] Technical problem to be solved by the invention

[0007] When powering a vehicle while it's in motion, high-speed, high-capacity communications are required to exchange information such as vehicle ID, requested power (demanded power), toll collection, vehicle specifications, and vehicle location. Therefore, interruptions in wide-area wireless communication during power supply must be rapidly detected and restored (restarted) while ensuring safety.

[0008] The present disclosure has been made in view of the above-mentioned problems, and an object of the present disclosure is to provide a control device that can quickly detect the interruption of wide-area wireless communication and quickly resume processing while ensuring safety.

[0009] Technical solutions to solve problems

[0010] The control device involved in the present disclosure includes a processor, which is configured to, in a wireless power transmission system that uses narrow-area wireless communication and wide-area wireless communication to transmit power in a contactless manner from a primary (primary) device of a supply equipment to a secondary (secondary) device of a moving vehicle, proceed to a magnetic coupling check to confirm the magnetic coupling state of the primary device and the secondary device when the interruption time of the wide-area wireless communication is less than a first threshold value, and proceed to a compatibility check to confirm the compatibility of the primary device and the secondary device when the interruption time is greater than the first threshold value.

[0011] Effects of the Invention

[0012] According to the present disclosure, it is possible to quickly detect interruption of wide-area wireless communication and quickly resume processing while ensuring safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 Schematic diagram showing a wireless power transmission system including a control device according to an embodiment.

[0014] Figure 2 This is a diagram showing the overall configuration of a wireless power transmission system.

[0015] Figure 3 This is a schematic diagram for explaining wide-area wireless communication in a wireless power transmission system.

[0016] Figure 4 This is a block diagram for explaining the functional structure of the power transmission ECU.

[0017] Figure 5 This is a block diagram for explaining the functional structure of a vehicle ECU.

[0018] Figure 6 A diagram for explaining the power transmission process.

[0019] Figure 7 This is a sequence diagram showing a case where communication using wide area wireless communication is performed between a vehicle and a supply device.

[0020] Figure 8 This is a timing chart showing the operation after the power supply from the supply device to the vehicle while it is running is completed.

[0021] Figure 9 This is a flowchart showing the processing executed by the control device. DETAILED DESCRIPTION

[0022] Hereinafter, a wireless power transmission system including a control device in an embodiment of the present invention will be described in detail. However, the present invention is not limited to the embodiment described below.

[0023] Figure 1 This is a schematic diagram illustrating a wireless power transmission system including a control device in an embodiment. Wireless power transmission system 1 includes a supply device 2 and a vehicle 3. Supply device 2 supplies power to vehicle 3 in a contactless manner while the vehicle is moving. Vehicle 3 is an electric vehicle that can be charged with power from an external power source, such as a battery-electric vehicle (BEV) or a plug-in hybrid electric vehicle (PHEV).

[0024] This wireless power transmission system 1 wirelessly transmits power from a supply device 2 to a vehicle 3 based on magnetic field resonant coupling (magnetic field resonance). Wireless power transmission system 1 transmits power from supply device 2 to vehicle 3 traveling on a road 4 in a contactless manner. Specifically, wireless power transmission system 1 transmits power through magnetic field resonance, utilizing magnetic field resonant coupling (magnetic field resonance) to supply power to vehicle 3 while it is traveling. Wireless power transmission system 1 can be described as a dynamic wireless power transmission (D-WPT) system or a magnetic field dynamic wireless power transmission (MF-D-WPT) system.

[0025] The supply equipment 2 includes a supply device 5 and an AC power source 6 that supplies power to the supply device 5. The supply device 5 transmits the power supplied from the AC power source 6 to the vehicle 3 in a contactless manner. The AC power source 6 is, for example, a commercial power source. The supply device 5 includes a power transmission device 10 having a primary coil 11.

[0026] The supply device 5 includes a segment 7 including a primary coil 11 and a management device 8 for managing the segment 7. The segment 7 is buried in the lane of the road 4. The management device 8 is set next to the road 4. The segment 7 is electrically connected to the management device 8. The management device 8 is electrically connected to the AC power supply 6 and supplies power from the AC power supply 6 to the segment 7. The segment 7 is electrically connected to the AC power supply 6 via the management device 8. A plurality of segments 7 can be arranged along the lane of the road 4. For example, Figure 1 As shown, the supply device 5 includes three segments 7 arranged along the lanes of the road 4 and a management device 8 connected to the three segments 7. The segments 7 have the function of transmitting power from the supply device 5 to the vehicle 3 in a contactless manner. The management device 8 has the function of controlling the wireless power transmission in the segments 7.

[0027] Vehicle 3 includes a power receiving device 20 having a secondary coil 21. Power receiving device 20 is installed on the bottom of the vehicle 3. When vehicle 3 travels on road 4, where primary coil 11 is installed, the ground-side primary coil 11 and the vehicle-side secondary coil 21 face each other in the vertical direction. While vehicle 3 travels on road 4, wireless power transmission system 1 transmits power from primary coil 11 of power transmitting device 10 to secondary coil 21 of power receiving device 20 in a contactless manner.

[0028] In this description, "driving" means that the vehicle 3 is on the road 4 for the purpose of traveling. "Driving" also includes the vehicle 3 temporarily stopping on the road 4. For example, the vehicle 3 stopping on the road 4 to wait at a traffic light is also included in "driving." On the other hand, even if the vehicle 3 is on the road 4, for example, if the vehicle 3 is parked, it is not included in "driving."

[0029] In this description, lanes where primary coils 11 (segments 7) are embedded are sometimes referred to as D-WPT lanes, and sections of road 4 where wireless power transmission via supply device 5 is possible are sometimes referred to as D-WPT charging stations. In D-WPT lanes and D-WPT charging stations, multiple primary coils 11 (segments 7) are arranged along the direction of travel of vehicle 3 within a predetermined section of road 4.

[0030] Figure 2 1 is a diagram showing the overall configuration of a wireless power transmission system. In the supply facility 2, the supply device 5 is electrically connected to an AC power source 6. In the supply device 5, the segments 7 are electrically connected to a management device 8.

[0031] The supply device 5 includes a configuration provided in the management device 8 and a configuration provided in the segment 7. The supply device 5 includes a power transmission device 10, a power transmission ECU (Electronic Control Unit) 110, a first communication device 120, a second communication device 130, and a foreign object detection device 140.

[0032] The power transmission device 10 includes a circuit connected to the AC power supply 6 . The power transmission device 10 includes a PFC (Power Factor Correction) circuit 210 , an inverter (INV) 220 , a filter circuit 230 , and a power transmission-side resonant circuit 240 .

[0033] The PFC circuit 210 improves the power factor of AC power input from the AC power source 6, converts the AC power into DC power, and outputs the DC power to the inverter 220. The PFC circuit 210 includes an AC / DC converter and is electrically connected to the AC power source 6.

[0034] Converter 220 converts the DC power input from PFC circuit 210 into AC power. Each switching element in converter 220 is composed of an IGBT (Insulated Gate Bipolar Transistor) or a MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor), and switches based on a control signal from power transmission ECU 110. For example, the drive frequency of converter 220 is 85 kHz. Converter 220 outputs the converted AC power to filter circuit 230.

[0035] Filter circuit 230 removes noise from the AC current input from converter 220 and supplies the noise-removed AC power to transmission-side resonant circuit 240. Filter circuit 230 is an LC filter that combines a coil and a capacitor. For example, filter circuit 230 is a T-type filter, which consists of two coils and a capacitor arranged in a T-shape. PFC circuit 210, converter 220, and filter circuit 230 constitute the power conversion unit 12 of power transmission device 10.

[0036] The power transmission-side resonant circuit 240 is a power transmission unit that transmits the AC power supplied from the filter circuit 230 to the power receiving device 20 in a contactless manner. When AC power is supplied from the filter circuit 230 to the power transmission-side resonant circuit 240, current flows through the primary coil 11, generating a magnetic field for power transmission.

[0037] The power-transmitting-side resonant circuit 240 includes a primary coil 11 and a resonant capacitor. The primary coil 11 is a power-transmitting coil. The resonant capacitor is connected in series with one end of the primary coil 11 to adjust the resonant frequency of the power-transmitting-side resonant circuit. This resonant frequency ranges from 10 kHz to 100 GHz, preferably 85 kHz. For example, the power-transmitting device 10 is configured such that the resonant frequency of the power-transmitting-side resonant circuit 240 coincides with the drive frequency of the converter 220. The power-transmitting-side resonant circuit 240 constitutes the primary device 13 of the power-transmitting device 10.

[0038] The power transmission device 10 includes a power conversion unit 12 and a primary device 13. The power conversion unit 12 includes a PFC circuit 210, an inverter 220, and a filter circuit 230. The primary device 13 includes a transmission-side resonant circuit 240. The power transmission device 10 has a configuration in which the power conversion unit 12 is provided in the management device 8, and the primary device 13 is provided in the segment 7.

[0039] In the supply device 5 , the power converter 12 , the power transmission ECU 110 , and the first communication device 210 of the power transmission device 10 are installed in the management device 8 , and the primary device 13 , the second communication device 130 , and the foreign object detection device 140 of the power transmission device 10 are installed in the segment 7 .

[0040] The power transmission ECU 110 is an electronic control unit that controls the power supply device 5. The power transmission ECU 110 includes a processor and memory. Processors include a CPU (Central Processing Unit), a DSP (Digital Signal Processor), and an FPGA (Field-Programmable Gate Array). Memory is a main storage device and includes RAM (Random Access Memory) and ROM (Read Only Memory). The power transmission ECU 110 loads programs stored in the storage unit into the working area of ​​the memory (main storage device) for execution. By executing the programs, it controls various components, thereby achieving functions that meet the intended purpose. The storage unit is composed of recording media such as EPROM (Erasable Programmable ROM), a hard disk drive (HDD), and removable media. Examples of removable media include disk recording media such as USB (Universal Serial Bus) memory, CD (Compact Disc), DVD (Digital Versatile Disc), and BD (Blu-ray Disc). The storage unit can store operating systems (OS), various programs, various tables, and various databases. Signals from various sensors are input to the power transmission ECU 110. Signals from the foreign object detection device 140 are also input to the power transmission ECU 110. Furthermore, the power transmission ECU 110 performs various controls based on the signals input from the various sensors.

[0041] For example, the power transmission ECU 110 performs power control to adjust the power for transmission. During power control, the power transmission ECU 110 controls the power transmission device 10. The power transmission ECU 110 outputs a control signal to the power conversion unit 12 to control the power supplied from the power conversion unit 12 to the primary device 13. The power transmission ECU 110 controls the switching elements included in the PFC circuit 210 to adjust the power for transmission, and also controls the switching elements included in the converter 220 to adjust the power for transmission.

[0042] The power transmission ECU 110 also performs communication control for controlling communication with the vehicle 3 . In the communication control, the power transmission ECU 110 controls the first communication device 120 and the second communication device 130 .

[0043] First communication device 120 is a ground-based communication device that performs wide-area wireless communication. First communication device 120 wirelessly communicates with vehicles 3 traveling on road 4 before approaching the WPT lane. The state before approaching the WPT lane means that vehicle 3 is in a position where narrow-area wireless communication with supply device 5 is impossible.

[0044] Wide-area wireless communication is communication with a communication distance of 10 meters to 10 kilometers. Wide-area wireless communication is communication with a longer communication distance than narrow-area wireless communication. As wide-area wireless communication, various wireless communication methods with long communication distances can be used. For example, communication that complies with communication standards such as 4G, LTE, 5G, and WiMAX established by 3GPP (registered trademark) and IEEE can be used for wide-area wireless communication. In the wireless power transmission system 1, vehicle information associated with vehicle identification information (vehicle ID) is transmitted from the vehicle 3 to the supply device 5 using wide-area wireless communication.

[0045] Second communication device 130 is a ground-based communication device that performs narrow-area wireless communication. Second communication device 130 wirelessly communicates with vehicles 3 traveling on road 4 that are approaching or entering a WPT lane. Approaching a WPT lane means that vehicle 3 is in a position where narrow-area wireless communication with supply device 5 is possible.

[0046] Narrow-area wireless communication is communication with a communication distance of less than 10 meters. Narrow-area wireless communication is communication with a communication distance shorter than wide-area wireless communication. As narrow-area wireless communication, various short-range wireless communications with short communication distances can be used. For example, communications that comply with any communication standard established by IEEE, ISO, IEC, etc. can be used for narrow-area wireless communication. As an example, Wi-Fi (registered trademark), Bluetooth (registered trademark), and ZigBee (registered trademark) can be used for narrow-area wireless communication. Alternatively, as a technology for performing narrow-area wireless communication, RFID (Radio Frequency Identification), DSRC (Dedicated Short Range Communication), etc. can also be used. In the wireless power transmission system 1, vehicle identification information and the like are sent from the vehicle 3 to the supply device 5 using narrow-area wireless communication.

[0047] Foreign object detection device 140 detects metallic foreign objects, living organisms, and the like above primary coil 11. It is comprised of, for example, a sensor coil and / or an imaging device installed on the ground. It is used to implement the foreign object detection (FOD) and / or living object protection (LOP) functions of wireless power transmission system 1.

[0048] In the supply device 5, the power transmission device 10 is configured separately in the segments 7 and the management device 8, and three segments 7 are connected to one management device 8. The power transmission device 10 is configured so that one converter supplies power to three transmission-side resonant circuits 240. Furthermore, in the supply device 5, signals from each segment 7 are input to the management device 8. Signals from the second communication device 130 and the foreign object detection device 14 provided in the first segment are input to the power transmission ECU 110. Similarly, signals from the second communication device 130 and the foreign object detection device 14 provided in the second segment are input to the power transmission ECU 110. Signals from the second communication device 130 and the foreign object detection device 14 provided in the third segment are input to the power transmission ECU 110. The power transmission ECU 110 can understand the status of each segment 7 based on the signals input from each segment 7.

[0049] The vehicle 3 includes a power receiving device 20 , a charging relay 310 , a battery 320 , a vehicle ECU 330 , a third communication device 340 , a fourth communication device 350 , and a GPS (Global Positioning System) receiver 360 .

[0050] The power receiving device 20 supplies the power received from the power transmitting device 10 to the battery 320. The power receiving device 20 is electrically connected to the battery 320 via the charging relay 310. The power receiving device 20 includes a power receiving-side resonant circuit 410, a filter circuit 420, and a rectifier circuit 430.

[0051] The receiving-side resonant circuit 410 is a power receiving unit that receives power transmitted contactlessly from the power transmitting device 10. The receiving-side resonant circuit 410 is composed of a receiving-side resonant circuit comprising a secondary coil 21 and a resonant capacitor. The secondary coil 21 is a receiving coil that receives power transmitted contactlessly from the primary coil 11. The resonant capacitor is connected in series with one end of the secondary coil 21 to adjust the resonant frequency of the receiving-side resonant circuit. The resonant frequency of the receiving-side resonant circuit 410 is determined to match the resonant frequency of the transmitting-side resonant circuit 240.

[0052] The resonant frequency of the receiving-side resonant circuit 410 is the same as the resonant frequency of the transmitting-side resonant circuit 240. Therefore, when the receiving-side resonant circuit 410 and the transmitting-side resonant circuit 240 face each other and a magnetic field is generated by the transmitting-side resonant circuit 240, the vibrations of the magnetic field are transmitted to the receiving-side resonant circuit 410. The primary coil 11 and the secondary coil 21 are in a resonant state. When an induced current flows through the secondary coil 21 due to electromagnetic induction, an induced electromotive force is generated in the receiving-side resonant circuit 410. In this way, the receiving-side resonant circuit 410 receives power transmitted from the transmitting-side resonant circuit 240 in a contactless manner. Furthermore, the receiving-side resonant circuit 410 supplies the power received from the transmitting-side resonant circuit 240 to the filter circuit 420. The receiving-side resonant circuit 410 constitutes the secondary device 22 of the power receiving device 20.

[0053] Filter circuit 420 removes noise from the AC current input from receiving-side resonant circuit 410 and outputs the noise-removed AC power to rectifier circuit 430. Filter circuit 420 is an LC filter that combines a coil and a capacitor. For example, filter circuit 420 is a T-type filter, which is a filter composed of two coils and a capacitor arranged in a T-shape.

[0054] Rectifier circuit 430 converts the AC power input from filter circuit 420 into DC power and outputs it to battery 320. Rectifier circuit 430 is comprised of, for example, a full-bridge circuit with four diodes connected as rectifying elements. A switching element is connected in parallel to each diode in rectifier circuit 430. Each switching element in rectifier circuit 430 is comprised of an IGBT and switches in response to a control signal from vehicle ECU 330. Rectifier circuit 430 supplies the converted DC power to battery 320. Filter circuit 420 and rectifier circuit 430 constitute power converter 23 of power receiving device 20.

[0055] The power receiving device 20 includes a secondary device 22 and a power conversion unit 23. The secondary device 22 includes a power receiving-side resonant circuit 410. The power conversion unit 23 includes a filter circuit 420 and a rectifier circuit 430.

[0056] Charging relay 310 is provided between rectifier circuit 430 and battery 320. The open and closed states of charging relay 310 are controlled by vehicle ECU 330. When battery 320 is charged by power transmission device 10, charging relay 310 is controlled to a closed state. When charging relay 310 is closed, rectifier circuit 430 and battery 320 are connected and can be energized. When charging relay 310 is open, rectifier circuit 430 and battery 320 are disconnected and cannot be energized. For example, when charging relay 310 is open, vehicle 3 does not request power supply.

[0057] Battery 320 is a rechargeable DC power source, such as a lithium-ion battery or a nickel-metal hydride battery. Battery 320 stores the power supplied from power transmission device 10 to power reception device 20. In addition, battery 320 can supply power to the driving motor of vehicle 3. Battery 320 is electrically connected to the driving motor via a PCU (Power Control Unit). The PCU is a power conversion device that converts the DC power of battery 320 into AC power and supplies it to the driving motor. Each switching element of the PCU is composed of an IGBT and performs switching operations according to the control signal from the vehicle ECU 330.

[0058] The vehicle ECU 330 is an electronic control unit that controls the vehicle 3. Its hardware configuration is similar to that of the power transmission ECU 110. Signals from various sensors installed on the vehicle 3 are input to the vehicle ECU 330. Furthermore, positioning signals received by the GPS receiver 360 are input to the vehicle ECU 330. The vehicle ECU 330 can obtain the current location information of the vehicle 3 from the GPS receiver 360. Furthermore, the vehicle ECU 330 executes various control operations based on the signals input from the various sensors.

[0059] For example, the vehicle ECU 330 performs contactless charging control to transmit power from the primary coil 11 to the secondary coil 21 in a contactless manner and store the power received by the secondary coil 21 in the battery 320. During the contactless charging control, the vehicle ECU 330 controls the rectifier circuit 430, the charging relay 310, the third communication device 340, and the fourth communication device 350. The contactless charging control includes power control for controlling the power for charging and communication control for controlling communication with the supply device 5. During the power control, the vehicle ECU 330 controls the switching elements included in the rectifier circuit 430 to adjust the power (charging power) supplied from the power receiving device 20 to the battery 320. During the communication control, the vehicle ECU 330 controls the third communication device 340 and the fourth communication device 350.

[0060] Third communication device 340 is a vehicle-side communication device that performs wide-area wireless communication. When vehicle 3, traveling on road 4, approaches the WPT lane, third communication device 340 wirelessly communicates with first communication device 120 of supply device 5. Wide-area wireless communication is bidirectional. Communication between first communication device 120 and third communication device 340 occurs via high-speed wireless communication.

[0061] The fourth communication device 350 is a vehicle-side communication device that performs narrow-area wireless communication. When the vehicle 3 approaches or enters the WPT lane, the fourth communication device 350 performs wireless communication with the second communication device 130 of the supply device 5. Narrow-area wireless communication is one-way wireless signal transmission (signaling). One-way wireless signal transmission is P2PS (Point to point signaling). In each activity of pairing, alignment check, magnetic coupling check, end of power transmission, and end of power transmission, P2PS is used to notify the supply device 5 of vehicle identification information from the vehicle 3. In addition, P2PS can be used as a means of lateral alignment check (Alignment check). The lateral direction is the width direction of the lane, which is the width direction of the vehicle 3.

[0062] The GPS receiver 360 detects the current position of the vehicle 3 based on positioning information obtained from a plurality of positioning satellites. The current position information of the vehicle 3 detected by the GPS receiver 360 is transmitted to the vehicle ECU 330.

[0063] Furthermore, in the supply device 5, the filter circuit 230 may be included in the management device 8 rather than in the segment 7. That is, the filter 230 may be installed adjacent to the road 4. In this case, the power conversion unit 12 includes the PFC circuit 210, the converter 220, and the filter circuit 230, and the primary device 23 includes the power transmission-side resonant circuit 240.

[0064] In addition, the filter circuit 230 may be provided for each primary coil 11 individually, or may be provided for a plurality of primary coils 11 collectively.

[0065] The filter circuit 230 is not limited to a T-type filter, and may be, for example, a bandpass filter in which a coil and a capacitor are connected in series. This also applies to the filter circuit 420 of the vehicle 3 .

[0066] Furthermore, when converter 220 is connected to multiple primary coils 11 in power transmission device 10, a switch for switching the primary coil 11 to be energized may be provided in each primary device 13. This switch may be provided in management device 8 near road 4 or near primary coil 11.

[0067] Furthermore, the power-transmitting-side resonant circuit 240 is not limited to a configuration in which the primary coil 11 and the resonant capacitor are connected in series. The primary coil 11 and the resonant capacitor may also be connected in parallel, or a combination of parallel and series connections may be used. In short, the power-transmitting-side resonant circuit 240 is configured such that the resonant frequency of the power-transmitting-side resonant circuit 240 matches the drive frequency of the inverter 220, and the connection relationship of its components is not particularly limited. This also applies to the power-receiving-side resonant circuit 410 of the vehicle 3.

[0068] In addition, the driving frequency of the converter 220 is not limited to 85 kHz, and may be a frequency around 85 kHz. In short, the driving frequency of the converter 220 may be within a predetermined frequency band including 85 kHz.

[0069] Furthermore, the power transmission device 10 may also have a configuration in which a plurality of converters 220 are connected to an output-side power line (DC power line) of the PFC circuit 210 .

[0070] Furthermore, the foreign object detection device 140 is not limited to being located on the ground side, but may also be located on the vehicle 3 side. For example, if the foreign object detection device on the vehicle 3 side detects a foreign object, a living organism, or the like above the primary coil 11, the power supply request may be stopped until the vehicle 3 passes over the primary coil 11.

[0071] In wireless power transmission system 1, information transmitted from vehicle 3 to power supply device 5 using narrow-area wireless communication includes, in addition to vehicle identification information, a power supply request and a requested power supply value. The power supply request is information requesting power transmission from primary coil 11. The requested power supply value is the requested amount of power to be transmitted from power supply device 5 to vehicle 3. Vehicle ECU 330 can calculate the requested power supply value based on the SOC of battery 320.

[0072] Furthermore, the wireless power transmission system 1 is not limited to a method for supplying power from the ground to the vehicle 3, but can also be a method for supplying power from the vehicle 3 to the ground. In this case, the rectifier circuit 430 is replaced with an inverter to achieve rectification during power supply and reception.

[0073] Figure 3 This is a schematic diagram for explaining wide-area wireless communication in a wireless power transmission system.

[0074] In the wireless power transmission system 1, the vehicle 3 can communicate with the server 30, and the supply device 5 can also communicate with the server 30. The server 30 is connected to a network 40 and can communicate with multiple vehicles 3 and multiple supply devices 5 via the network 40. The network 40 is composed of a WAN (Wide Area Network) such as the Internet, a public communication network, or a mobile phone communication network.

[0075] The vehicle 3 is connected to the network 40 by wide area wireless communication using the third communication device 340. The vehicle 3 transmits information to the server 30 and receives information from the server 30.

[0076] The supply device 5 is connected to the network 40 by wide area wireless communication using the first communication device 120. The supply device 5 transmits information to the server 30 and receives information from the server 30.

[0077] Figure 4 1 is a block diagram showing the functional configuration of the power transmission ECU 110 . The power transmission ECU 110 includes a first communication control unit 510 , a second communication control unit 520 , and a power transmission control unit 530 .

[0078] First communication control unit 510 executes first communication control for controlling first communication device 120. The first communication control controls wide-area wireless communication on the supply device 5 side, and controls communication within supply device 5 using first communication device 120. Specifically, the first communication control controls communication within supply device 5 and management device 8. The first communication control controls communication between supply device 5 and network 40, and also controls communication between supply device 5 and server 30 via network 40. First communication control unit 510 is a SECC (Supply Equipment Communication Controller).

[0079] The second communication control unit 520 executes the second communication control for controlling the second communication device 130. The second communication control controls narrow-area wireless communication on the supply device 5 side and controls communication within the supply device 5 using the second communication device 130. Specifically, the second communication control controls communication within the supply device 5 and within the segment 7. The second communication control controls communication between the supply device 5 and the vehicle 3 as communication that does not pass through the network 40. The second communication control unit 520 is a PDCC (Primary Device Communication Controller).

[0080] Power transmission control unit 530 performs power transmission control for power transmission device 10. Power transmission control controls the power for transmission and controls power supply unit 12 of power transmission device 10. Power transmission control unit 530 performs power control for PFC circuit 210 and converter 220.

[0081] Figure 53 is a block diagram showing the functional configuration of a vehicle ECU. Vehicle ECU 330 includes a third communication control unit 610 , a fourth communication control unit 620 , and a charging control unit 630 .

[0082] The third communication control unit 610 executes the third communication control for controlling the third communication device 340. The third communication control controls wide-area wireless communication on the vehicle 3 side and controls communication within the vehicle 3 using the third communication device 340. The third communication control controls communication between the vehicle 3 and the network 40, and also controls communication between the vehicle 3 and the server 30 via the network 40. The third communication control unit 610 is an EVCC (EV Communication Controller).

[0083] The fourth communication control unit 620 executes the fourth communication control for controlling the fourth communication device 350. The fourth communication control controls narrow-area wireless communication on the vehicle 3 side and controls communication within the vehicle 3 using the fourth communication device 350. The fourth communication control controls communication between the vehicle 3 and the supply device 5 as communication that does not pass through the network 40. The fourth communication control unit 620 is an SDCC (Secondary Device Communication Controller).

[0084] The charging control unit 630 performs charging control for the power receiving device 20 and the charging relay 310. This charging control includes power control for controlling the power received by the secondary device 20 and relay control for controlling the connection between the secondary device 22 and the battery 320. The charging control unit 630 performs power control for the rectifier circuit 430. The charging control unit 630 also performs relay control for switching the charging relay 310 between open and closed states.

[0085] In the thus configured wireless power transmission system 1, wireless power transmission is performed from the supply device 5 to the vehicle 3 while wireless communication is established between the vehicle 3 and the supply device 5. With the vehicle 3 and the supply device 5 paired via wireless communication, power is transmitted contactlessly from the ground-side primary coil 11 to the vehicle-side secondary coil 21. Furthermore, within the vehicle 3, charging control is performed to supply the power received by the secondary coil 21 to the battery 320.

[0086] Next, refer to Figure 6 , the power transmission process (D-WPT process) is described. The power transmission process is structured as a chain of multiple activities, which is a process derived from states and corresponding transitions.

[0087] Figure 6 This is a diagram used to explain the power transmission process. Figure 6 The basic activities used to illustrate the power transmission process are shown in . Figure 6 The thick arrows shown represent transition lines. The state of the wireless power transmission system 1 during power transmission is represented by the activities constituting the power transmission process.

[0088] The activities that make up the power transmission process include: activities during the power transmission phase, namely the power transmission service session (D-WPT service session A70); activities before the power transmission phase; and activities after the power transmission phase. Furthermore, activities can be described by distinguishing the main actions based on whether or not communication occurs between the supply device 5 and the vehicle 3. Activities are categorized as activities that indicate only the status of the supply device 5 without communication, activities that indicate only the status of the vehicle 3 without communication, and activities that indicate the status of both the supply device 5 and the vehicle 3 with communication.

[0089] like Figure 6 As shown, the activities include the master power on state (Master power On) A10, preparation (Preparation) A20, waiting for a request from the vehicle 3 (Waiting for D-WPT service request) A30, the master power on state (Master power On) A40, preparation (Preparation) A50, communication setup (Communication setup) and request for D-WPT service (Communication setup / Request D-WPT service) A60, D-WPT service session (D-WPT service session) A70, and end of the D-WPT service session (Terminate D-WPTservice session) A80.

[0090] Preparation A20 is the preparation state of the supply device 5. In preparation A20, the supply device 5 starts the circuit and confirms safety without communicating with the vehicle 3. When the supply device 5 enters the main power supply on state A10, it changes to the preparation A20 state. Moreover, if the supply device 5 starts the circuit and successfully confirms safety in preparation A20, the state changes to waiting for a request from the vehicle 3 (Waiting for D-WPT service request) A30. On the other hand, if there is a problem with the supply device 5, the supply device 5 notifies the vehicle 3 through wide area wireless communication of information indicating that the wireless power transmission system 1 cannot be used (unusable notification). The first communication device 120 sends the unusable notification to the vehicle 3.

[0091] Preparation A50 is the preparation state of vehicle 3. In Preparation A50, vehicle 3 starts the circuit and confirms safety without communicating with supply device 5. When vehicle 3 enters main power on state A40, it transitions to Preparation A50. Furthermore, if vehicle 3 starts the circuit and successfully confirms safety in Preparation A50, the state transitions to Communication Setup / Request D-WPT Service A60. On the other hand, if there is a problem with vehicle 3, vehicle 3 does not start wide-area wireless communication and does not proceed with subsequent subsequent events (sequences) in the D-WPT process.

[0092] Communication setup and request for D-WPT service A60 is started by the vehicle ECU 330. In the communication setup and request for D-WPT service A60, the vehicle ECU 330 starts wide area wireless communication. First, when the vehicle 3 changes from preparation A50 to communication setup and request for D-WPT service A60, the third communication device 340 sends a request signal for D-WPT service. The third communication device 340 wirelessly communicates with the first communication device 120 corresponding to the D-WPT lane that the vehicle 3 is scheduled to enter or has entered. The first communication device 120 of the communication object is selected based on the relative position relationship between the current position of the vehicle 3 and the position of the D-WPT lane. On the supply device 5 side, in the state of waiting A30 for the request from the vehicle 3, when the first communication device 120 receives the request signal for D-WPT service, the state changes to communication setup and request for D-WPT service A60. Various information of wide area wireless communication and P2PS communication are linked using vehicle identification information. In Figure 7 The communication setup and the processing sequence of the request A60 for the D-WPT service are shown in FIG.

[0093] Figure 7This is a timing diagram showing a situation in which communication using wide area wireless communication is implemented between a vehicle and a supply device. Vehicle 3 sends vehicle information to server 30 (step S11). In step S11, the third communication device 340 of vehicle 3 sends vehicle information to server 30. The vehicle information includes vehicle identification information, various parameters of the power receiving device 20, the current position information of vehicle 3, and the requested power. The vehicle ECU 330 calculates the requested power based on the SOC (State Of Charge) of the battery 320. In step S11, the vehicle ECU 330 sends vehicle information from the third communication device 340 at predetermined intervals. The predetermined time is set according to the distance from the current position of vehicle 3 to the starting point of the WPT lane. The shorter the distance from vehicle 3 to the starting point of the WPT lane, the shorter the interval of the predetermined time.

[0094] Upon receiving the vehicle information from the vehicle 3, the server 30 determines the vehicle identification information of the vehicle 3 located within the vicinity of the supply device 5 based on the current location information of the vehicle 3 included in the vehicle information (step S12). In step S12, the server 30 determines that the vehicle 3 is located within a predetermined vicinity of the supply device 5 based on the current location information of the vehicle 3 and the location information of the supply device 5. The vicinity is set to, for example, an area within 500 meters.

[0095] When the server 30 identifies the vehicle identification information of the vehicle 3 , it transmits the vehicle information to the supply device 5 (step S13 ). In step S13 , the transmission device of the server 30 transmits the vehicle information to the supply device 5 .

[0096] Upon receiving the vehicle information from the server 30, the supply device 5 registers or deletes the vehicle identification information from the identification information list (step S14). In step S14, the power transmission ECU 110 registers or deletes the vehicle identification information from the identification information list so that the vehicle identification information associated with the vehicle information is registered in the identification information list without any more or less.

[0097] When registering / deleting the vehicle identification information in the identification information list, the supply device 5 transmits the vehicle identification information registered in the identification information list to the server 30 (step S15 ). In step S15 , the first communication device 120 of the supply device 5 transmits the vehicle identification information to the server 30 .

[0098] Then, upon receiving the vehicle identification information from the supply device 5, the server 30 transmits a list registration notification to the vehicle 3 corresponding to the vehicle identification information registered in the identification information list (step S16). In step S16, the communication device of the server 30 transmits the list registration notification to the vehicle 3. The list registration notification indicates that the vehicle identification information has been registered in the identification information list and includes the identification information of the supply device 5 and the location information of the supply device 5.

[0099] Thus, when vehicle 3 initiates wide-area wireless communication, and both the supply device 5 and vehicle 3 enter the state of communication setup and D-WPT service request A60, the wide-area wireless communication communication setup is successful. Based on the successful communication setup, the state transitions to D-WPT service session A70.

[0100] return Figure 6 The D-WPT service session A70, while a communication connection is established between the supply device 5 and the vehicle 3, transmits power contactlessly from the power-transmitting resonant circuit 240 of the supply device 5 to the power-receiving resonant circuit 410 of the vehicle 3. The D-WPT service session A70 begins with successful communication setup and ends when communication ends. When communication ends in the D-WPT service session A70, the state transitions to the D-WPT service session (Terminate D-WPT servicesession) A80.

[0101] During the D-WPT service session termination A80, vehicle 3 terminates wide-area wireless communication with supply device 5. Vehicle 3 and supply device 5 can receive the termination trigger of D-WPT service session A70. Furthermore, vehicle ECU 330 prevents D-WPT from starting with secondary device 22 and vehicle 3 until third communication device 340 receives the next notification (D-WPT service request signal).

[0102] Here, detailed operations of the D-WPT service session A70 will be described.

[0103] The D-WPT service session A70 includes a compatibility check and service authentication (Compatibility check / Service authentication) A110, a fine positioning (Fine Positioning) A120, a pairing and alignment check (Pairing / Alignment check) A130, a magnetic coupling check (Magnetic Coupling Check) A140, a power transfer execution (Perform Power Transfer) A150, a standby (Stand-by) A160, and a power transfer terminated (Power transfer terminated) A170.

[0104] The compatibility check and service authentication A110 are explained below. After successful communication setup, the vehicle ECU 330 and the power transmission ECU 110 confirm the compatibility of the primary device 13 and the secondary device 22. This compatibility check is performed by the supply device 5 based on information associated with the vehicle identification information acquired through communication. Inspection items include the minimum ground height of the secondary device 22, the shape and type of the secondary device 410, the circuit topology of the secondary device 22, the self-resonant frequency of the secondary device 22, and the number of secondary coils 21.

[0105] In the compatibility check and service authentication A110, vehicle 3 first transmits compatibility information (Compatibility Information) of power receiving device 20 from third communication device 340 to supply device 5. Supply device 5's first communication device 120 receives the compatibility information of power receiving device 20 from vehicle 3. Furthermore, supply device 5's first communication device 120 transmits compatibility information of power transmitting device 10 to vehicle 3. Vehicle 3's third communication device 340 receives the compatibility information of power transmitting device 10 from supply device 5.

[0106] The elements of the compatibility information sent by the vehicle 3 to the supply device 5 include vehicle identification information, WPT power classes, air gap classes, WPT operating frequencies, WPT frequency adjustment, WPT type, WPT circuit topology, fine positioning method, pairing method, alignment method, and information on whether there is a power adjustment function.

[0107] The elements of the compatibility information sent by the supply device 5 to the vehicle 3 include supply device identification information, WPT power level, gap level, WPT drive frequency, WPT frequency adjustment, WPT type, WPT circuit topology, fine alignment method, pairing method, alignment method, and information on whether or not a power adjustment function is available.

[0108] Each element name is described in detail. In addition, each element of the compatibility information sent from the vehicle 3 to the supply device 5 is described. For elements in the compatibility information sent from the supply device 5 to the vehicle 3 that are duplicated in the compatibility information sent from the vehicle 3 to the supply device 5, their description is omitted.

[0109] The gap level is information indicating the gap level at which the secondary device 22 can receive power. The WPT power level is information indicating the power level at which the secondary device 22 can receive power. The WPT drive frequency is information indicating the frequency of the power received by the secondary device 22. The WPT frequency adjustment is information indicating whether the drive frequency can be adjusted. The WPT type is information indicating the shape type of the secondary device 22, and is information indicating the coil shape of the secondary coil 21. Shapes indicating the WPT type include circular and spiral shapes. The WPT circuit topology is information indicating the connection structure between the secondary coil 21 and the resonant capacitor. WPT circuit topologies include series and parallel connections. The fine alignment method is information indicating how alignment is performed. The pairing method is a method for pairing the vehicle 3 to determine the supply device 5. The alignment method indicates a method for confirming the relative positions of the secondary device 22 and the primary device 13 before power transmission begins.

[0110] Fine alignment A120 will be described. Vehicle 3 performs fine lateral alignment A120 before or in parallel with pairing and alignment check A130. Vehicle ECU 330 initiates fine lateral alignment A120 when it determines that vehicle 3 is approaching or entering an area (WPT lane) where supply device 5 is located.

[0111] The vehicle ECU 330 guides the vehicle 3 and aligns the primary device 13 and the secondary device 22 within a range where sufficient magnetic coupling for wireless power transmission is established.

[0112] The fine alignment A120 is basically performed manually or automatically on the vehicle 3. The fine alignment A120 can be linked with an ADAS (Automatic Driving Assistance System).

[0113] Furthermore, fine alignment A120 can continue until vehicle 3 leaves the D-WPT charging station or the status changes to communication termination, and is executed based on alignment information transmitted from supply device 5 to vehicle 3 via wide-area wireless communication. This communication termination refers to the D-WPT service session termination A80.

[0114] The pairing and alignment check (Pairing / Alignment check) A130 is described. Here, pairing and alignment check are described separately.

[0115] The P2PS interface for narrow-area wireless communication ensures that the primary device 13 and the secondary device 22 are uniquely paired. The process of the pairing state is as follows.

[0116] First, the vehicle ECU 330 identifies that vehicle 3 is approaching or entering a D-WPT lane. For example, the vehicle ECU 330 has map information containing D-WPT lanes and compares it with the vehicle's own location information obtained by the GPS receiver 360, using the straight-line distance, etc. to identify the approach or entry. Vehicle 3 transmits the information to the server 30 via wide-area wireless communication, indicating which D-WPT lane vehicle 3 is approaching. In short, the third communication device 340 notifies the cloud of a signal indicating which D-WPT lane vehicle 3 is approaching. Furthermore, if the vehicle ECU 330 identifies that vehicle 3 is approaching or entering a D-WPT lane, the fourth communication device 350 begins transmitting modulated signals at regular intervals to pair the primary device 13 with the secondary device 22.

[0117] In addition, the supply device 5 can also use the information obtained from the server 30 via wide-area wireless communication to identify that the vehicle 3 is approaching or entering the D-WPT lane. The server 30 distributes the vehicle identification information of the vehicle 3 approaching in each D-WPT lane to the supply device 5 corresponding to that lane. The supply device 5 only needs to refer to the vehicle identification information reduced in number by the server 30, so it can perform the authentication process in a short time. When the supply device 5 recognizes that the vehicle 3 is approaching the D-WPT lane, the second communication device 130 enters the standby mode. In the standby mode, it waits to receive the modulated signal from the fourth communication device 350 of the vehicle 3. The modulated signal includes the vehicle identification information.

[0118] When the second communication device 130 receives the modulated signal from the vehicle 3, the supply device 5 compares the vehicle identification information received via narrow-area wireless communication with the vehicle identification information in the identification information list obtained through wide-area wireless communication with multiple vehicles 3 traveling in the D-WPT lane. Through this comparison, the supply device 5 identifies the vehicle 3.

[0119] When the vehicle ECU 330 recognizes that the vehicle 3 is outside the D-WPT lane, it stops transmitting the modulated signal from the fourth communication device 350. The vehicle ECU 330 can determine whether the vehicle 3 has passed the D-WPT lane based on the map information and the vehicle's position information.

[0120] When the supply device 5 determines that the vehicle 3 is not traveling on the D-WPT lane or that the vehicle 3 is not approaching the D-WPT lane, the supply device 5 stops and waits for the modulated signal from the fourth communication device 350 .

[0121] Pairing is performed on the primary device 13 until the vehicle 3 leaves the D-WPT charging station or the status changes to communication ended. When pairing is completed, the status changes to alignment check.

[0122] The purpose of the alignment check is to confirm that the lateral distance between the primary device 13 and the secondary device 22 is within the allowable range. The alignment check is performed using narrow area wireless communication (P2PS).

[0123] The alignment check is continuously executed based on P2PS until the vehicle 3 leaves the D-WPT charging station or the communication state is changed to communication end. The alignment check result can be transmitted from the first communication device 120 to the third communication device 340 via wide area wireless communication.

[0124] The magnetic coupling check A140 will be described. In the magnetic coupling check A140, the supply device 5 checks the magnetic coupling state and confirms that the secondary device 22 is within the allowable range. When the magnetic coupling check A140 is completed, the state transitions to the power transmission execution A150.

[0125] The execution of power transmission A150 will be described. In this state, the supply device 5 transmits power to the power receiving device 20. To ensure the effectiveness of MF-D-WPT and protect the power receiving device 20 and battery 320, the power transmitting device 10 and the power receiving device 20 must be capable of controlling the transmitted power (both transmitted and received). Greater power transmission helps increase the travel range of the power receiving device 20 without static wireless charging or conductive charging. However, the capacity of the battery 320 varies depending on the vehicle type, and the driving power demand can sometimes fluctuate dramatically. An example of such a sudden change is sudden regenerative braking. When regenerative braking is applied while traveling on a D-WPT lane, regenerative braking is prioritized, so in addition to the regenerative power, the received power from the power receiving device 20 is also supplied to the battery 320. In this case, the power receiving device 20 needs to adjust the transmitted power to protect the battery 320 from overcharging.

[0126] Although power control is necessary, communication between the power supply device 5 and the power receiving device 20 will not be resumed in this state. This is because communication, due to its instability and latency, could compromise the responsiveness and accuracy of power control. Therefore, the power supply device 5 and the power receiving device 20 perform power transmission and control based on the information known up to that point.

[0127] The supply device 5 previously uses wide area wireless communication to increase the transmission power for the magnetic coupling test in response to the power request sent from the third communication device 340. The supply device 5 keeps the fluctuations of current and voltage within their ranges and attempts to maximize the power transmitted during the transition.

[0128] The power receiving device 20 receives the transmitted power from the power transmitting device 10 essentially without any control. However, the power receiving device 20 begins to exercise control when the transmitted power exceeds or is exceeding the limit, for example, when the rated power (output) of the battery 320 fluctuates depending on the charge state and / or the driving power demand of the vehicle 3. Furthermore, the power control in the vehicle ECU 330 is also required to address malfunctions in wide-area wireless communication. Such malfunctions can arise from conflicts between the power control target in the primary device 13 and the request from the third communication device 340, as well as sudden failures of the power receiving device 20 or battery 320 during power transmission. The power receiving device 20 controls the transmitted power at the power request rate notified by the first communication device 120.

[0129] The power request is determined based on the WPT circuit topology, geometry, ground clearance, and EMC (electromagnetic compatibility) compatibility check information of the vehicle 3 and primary device 13. The magnetic field varies according to these specifications, and power must be transmitted within the EMC range.

[0130] There is a potential for interference between power control in the power transmitting ECU 110 and the power receiving device 20. This interference is particularly likely to occur if the supply device 5 attempts to implement a power request, via wide-area wireless communication, that exceeds the current power limit in the power receiving device 20. An example of this is the rapid regeneration control of the relatively small battery 320 in the vehicle 3. If possible, the supply device 5 should be able to detect a mismatch between the power control target and the limit and adjust power transmission to resolve the mismatch.

[0131] For example, if foreign object detection device 140 detects a foreign object on primary device 13, or if magnetic coupling is reduced due to poor alignment of secondary device 22, and power transmission is temporarily interrupted while secondary device 22 remains above primary device 13, the state transitions to Stand-by A 160. Furthermore, if vehicle 3 is equipped with a foreign object detection device, foreign objects can also be detected on the vehicle 3 side.

[0132] When the secondary device 22 passes over the primary device 13, the state transitions to the end of power transmission A170. In this state, the magnetic coupling between the two devices weakens, and the amount of power transferred decreases. The supply device 5 can detect this weakening of magnetic coupling by monitoring the transmitted power. Therefore, the supply device 5 essentially decides to transition to the end of power transmission A170 and then begins reducing the voltage to stop power transmission.

[0133] The standby state A160 will be described. In this state, if power transmission is temporarily interrupted for some reason, and D-WPT is ready in both the vehicle 3 and the supply device 5, the state returns to the power transmission execution state A150. If there is a possibility of power transmission being interrupted, the state returns to the standby state A160.

[0134] The end of power transmission A170 is described. In this state, the supply device 5 reduces the transmitted power to zero, and maintains or uploads power transmission result data such as the total transmitted power, power transmission efficiency, and fault history. Each data is marked with vehicle identification information. Finally, the supply device 5 deletes the vehicle identification information of the vehicle 3 that passed through the D-WPT lane. In this way, the supply device 5 can prepare for subsequent pairing and power transmission to other vehicles. Figure 8 2 shows the processing sequence of the end of power transmission A170.

[0135] Figure 8This is a sequence diagram showing the operations after power supply from the supply device to the vehicle ends while the vehicle is traveling. When power receiving device 20 of vehicle 3 ends power reception from supply device 5 (step S21), vehicle 3 transmits power reception completion information to server 30 (step S22). In step S22, third communication device 340 of vehicle 3 transmits the power reception completion information. The power reception completion information includes, for example, vehicle identification information of vehicle 3, received power from supply device 5, power reception efficiency, and abnormality detection results as information related to power reception from supply device 5.

[0136] When step S21 is executed, the supply device 5 ends power supply to the vehicle 3 (step S23). Steps S21 and S23 may be executed simultaneously or separately. After step S23 is executed, the supply device 5 transmits power supply termination information to the server 30 (step S24). In step S24, the power supply termination information is transmitted from the first communication device 120 of the supply device 5.

[0137] Upon receiving the power reception completion information from vehicle 3 and the power transmission completion information from supply device 5, server 30 performs power supply completion processing to terminate the power supply from supply device 5 to vehicle 3 (step S25). In the power supply completion processing, based on the power reception completion information and the power transmission completion information, the amount of power supplied from supply device 5 to vehicle 3 is calculated, and the user of vehicle 3 is charged based on the calculated amount of power supplied.

[0138] Moreover, regardless of the power supply end process, the vehicle 3 transmits the vehicle information to the server 30 (step S26). In step S26, the vehicle information is transmitted from the third communication device 340 of the vehicle 3.

[0139] After executing the power supply end process, when the server 30 receives the vehicle information from the vehicle 3 , it specifies the vehicle identification information of the vehicle 3 located in the vicinity of each supply device 5 based on the vehicle information (step S27 ).

[0140] Moreover, when the power supply termination process has been performed on a certain vehicle 3 in a certain supply device 5, the server 30 deletes the vehicle identification information of the vehicle 3 that has undergone the power supply termination process from the vehicle identification information of the vehicles 3 in the vicinity of the supply device 5 determined by the processing of step S27 (step S28).

[0141] Then, the server 30 transmits the vehicle information associated with the vehicle identification information not deleted in the process of step S28 among the vehicle identification information of the vehicles 3 determined to be located in the vicinity of each supply device 5 to each supply device 5 (step S29 ).

[0142] After the vehicle information is sent to each supply device 5 through the process of step S29, when the supply device 5 receives the vehicle information from the server 30, the supply device 5 registers / erases the vehicle identification information in the identification information list (step S30). Figure 7 The processing of step S14 is the same as that of step S14. Then, the supply device 5 sends the vehicle identification information registered in the identification information list to the server 30 (step S31). The processing of step S31 is the same as that of step S14. Figure 7 The processing of step S15 is the same.

[0143] Furthermore, when the server 30 receives the vehicle identification information from the supply device 5, it transmits a list registration notification to the vehicle 3 corresponding to the vehicle identification information registered in the identification information list (step S32). Figure 7 The processing of step S16 is the same.

[0144] As a result, in the Figure 8 In the illustrated process, the vehicle identification information is registered in the identification information list for vehicles 3 that are located in the vicinity of each supply device 5, whose power supply from that supply device 5 has not yet ended, and whose vehicle identification information has not been requested to be erased. Furthermore, if vehicle 3's vehicle identification information is registered in the identification information list of any supply device 2, vehicle 3 receives a list registration notification. Therefore, by receiving the list registration notification, vehicle ECU 330 can determine which supply device 5 its vehicle is registered in. Furthermore, if vehicle 3 leaves the vicinity of a supply device 5, the vehicle identification information of that vehicle 3 is erased from the identification information list of the supply device 5.

[0145] return Figure 6 In addition, in the end of power transmission A170, in the power receiving device 20, no processing is required to make the transmitted power zero. The P2PS interface is kept active when the vehicle 3 is in the D-WPT lane, and the state of the power receiving device 20 is automatically changed to paired for the next power transmission from the primary device 13. Figure 6 As shown in the transition line, the state changes from the end of power transmission A170 to the pairing and alignment check A130. Figure 6 As shown, when predetermined transition conditions are met, the process can transition from magnetic coupling check A140 to pairing and alignment check A130, and from power transmission execution A150 to pairing and alignment check A130. Pairing can be performed for each of the multiple primary coils 11, or it can be performed at a representative point when the multiple primary coils 11 are bundled together.

[0146] Furthermore, if there is no D-WPT request from the vehicle ECU 330, or if the series of states from communication setup and D-WPT service request A60 to power transmission termination A170 is disabled, the D-WPT service session A70 transitions to D-WPT service session termination A80, terminating the wide-area wireless communication between the first communication device 120 and the third communication device 340. For example, D-WPT is terminated when the battery 320's state of charge is too high, or when the power receiving device 20 overheats due to continuous power transmission. Such unnecessary D-WPT can be disabled by simply deactivating the P2PS interface. However, by terminating the wide-area wireless communication, the power transmitting ECU 110 terminates the established wide-area wireless communication, freeing up memory used for vehicle 3.

[0147] In addition, the D-WPT service session A70 is not limited to Figure 6 The transition is as shown in the transition line. In the D-WPT service session A70, when the activities after the pairing and alignment check A130 end, if the conditions for the power transmission process to remain in the D-WPT service session A70 are met, the state does not transition to the end of the D-WPT service session A80, but instead transitions to the compatibility check and service authentication A110. For example, if the predetermined transition conditions are met while in the magnetic coupling check A140 state, the state can transition to the compatibility check and service authentication A110.

[0148] Figure 9 Flowchart 2 is a flowchart showing the processing executed by the control device. The supply device 2 as the control device determines whether the interruption time of the wide area wireless communication interruption is greater than the first threshold value A (step S1).

[0149] When the supply device 2 determines that the interruption time is greater than the first threshold value A (step S1 : Yes), the supply device 2 determines whether the interruption time is greater than the second threshold value B (step S2 ).

[0150] When the supply device 2 determines that the interruption time is greater than the second threshold value B (step S2: Yes), the supply device 2 proceeds to (moves to) start of communication setting for wide area wireless communication ( Figure 6 Communication settings and request for D-WPT service A60) (step S3).

[0151] If the supply equipment 2 determines that the interruption time is less than the second threshold value B in step S2 (step S2: No), the supply equipment 2 switches to the power transmission service ( Figure 6 The initial process of the D-WPT service session A70) is to check the compatibility of the primary device 13 and the secondary device 22. Figure 6Compatibility check and service authentication A110) (step S4).

[0152] If the supply equipment 2 determines that the interruption time is less than the first threshold value A in step S1 (step S1: No), the supply equipment 2 is interrupted by the short-term interruption of power transmission ( Figure 6 Standby A160), and then proceed to the magnetic coupling check ( Figure 6 Magnetic coupling check A140) (step S5).

[0153] The control device described above ensures safety by returning to the previous process to resume processing if the wide area wireless communication interruption time is longer, and quickly resumes processing from the later process if the wide area wireless communication interruption time is shorter.

[0154] Furthermore, the supply equipment 2 may set the first threshold value A and the second threshold value B according to the speed of the vehicle 3. By setting the first threshold value A and the second threshold value B according to the speed, safety can be reliably ensured even at high speeds, and processing can be quickly resumed at low speeds.

[0155] In addition, Figure 9 , the control device can resume processing from any process based on the first threshold A and the second threshold B.

[0156] Alternatively, the control device may be the vehicle 3 or the server 30. In other words, the vehicle 3 or the server 30 may determine whether the interruption time is greater than the first threshold A or the second threshold B. Similarly, the vehicle 3 or the server 30 may determine which process to restart based on the communication interruption time.

[0157] Further effects and modifications can be easily derived by those skilled in the art. The broader technical solutions disclosed herein are not limited to the specific detailed and representative embodiments shown and described above. Therefore, various changes can be made without departing from the spirit or scope of the general inventive concept defined by the appended claims and their equivalents.

[0158] Description of Reference Numerals

[0159] 1: Wireless power transmission system

[0160] 2: Supply equipment

[0161] 3: Vehicle

[0162] 4: Road

[0163] 5: Supply device

[0164] 6: AC power supply

[0165] 10: Power transmission device

[0166] 11: Primary coil

[0167] 20: Power receiving device

[0168] 21: Secondary coil

Claims

1. A control device comprising a processor, The processor is configured as follows: In a wireless power transmission system that transmits power from a primary device of a supply facility to a secondary device of a moving vehicle in a contactless manner using narrow-area wireless communication and wide-area wireless communication, If the interruption time of the wide area wireless communication interruption is equal to or less than a first threshold, the process proceeds to a magnetic coupling check for confirming the magnetic coupling state between the primary device and the secondary device. If the interruption time is greater than the first threshold, the process proceeds to a compatibility check to confirm whether the primary device and the secondary device are compatible.

2. The control device according to claim 1, The processor proceeds to start communication setting of the wide area wireless communication when the interruption time is greater than a second threshold value, the second threshold value being greater than the first threshold value.

3. The control device according to claim 2, The processor sets the first threshold and the second threshold according to the vehicle speed.

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