JP6939178B2 - Power transmission system - Google Patents

Description

The present disclosure relates to a power transmission system, and more particularly to a power transmission system that transmits power from a power transmission device to a power receiving device in a non-contact manner.

A power transmission system that transmits power from a power transmitting device to a power receiving device in a non-contact manner is known (see, for example, Patent Documents 1 to 5). In such a power transmission system, Japanese Patent Application Laid-Open No. 2013-27116 (Patent Document 6) discloses a technique for detecting a foreign substance existing on a power feeding surface of a power feeding device (power transmission device). This power feeding device includes a light guide unit that guides light emitted from the light emitting unit provided on the bottom surface of the vehicle to the power feeding surface of the power feeding device from the feeding surface. Then, by detecting the brightness and darkness of the light guided from the light guide unit with the foreign matter detecting unit, the foreign matter existing on the feeding surface is detected (see Patent Document 6).

Japanese Unexamined Patent Publication No. 2013-154815 Japanese Unexamined Patent Publication No. 2013-146154 Japanese Unexamined Patent Publication No. 2013-146148 Japanese Unexamined Patent Publication No. 2013-10822 Japanese Unexamined Patent Publication No. 2013-126327 Japanese Unexamined Patent Publication No. 2013-27116

The power transmission device is equipped with a photographing device (camera) capable of photographing the surroundings of the power transmission unit, and the photographing device is used to detect foreign matter existing between the power transmission device and the power receiving device and to display a marker provided on the power receiving device. It is conceivable to align the power transmitting unit and the power receiving unit of the power receiving device by detecting the power transmission unit. In this case, it is conceivable to provide a light emitting body in the power transmission device or the power receiving device in order to enable detection by the photographing device even in the dark, but there is a possibility that the detection accuracy cannot be ensured due to light reflection or interference.

The present disclosure has been made to solve such a problem, and an object thereof is in a power transmission system that detects foreign matter and aligns a power transmission unit and a power reception unit by using a photographing device provided in the power transmission device. It is to ensure the detection accuracy of foreign matter detection and alignment using a photographing device.

The power transmission system of the present disclosure includes a power transmission device and a power receiving device. The power transmission device includes a power transmission unit, a photographing device, and a first light emitting body. The power transmission unit is configured to transmit power to the power receiving device in a non-contact manner. The photographing device is configured to photograph the surroundings of the power transmission unit. The first light emitter is provided on the power transmission unit. The power receiving device includes a power receiving unit and a second light emitting body. The power receiving unit is configured to receive power from the power transmitting unit in a non-contact manner. The second light emitting body is provided so that it can be photographed by the photographing device at the time of performing the alignment between the power transmitting unit and the power receiving unit. The first light emitter is turned on during the execution of foreign matter detection using the image captured by the photographing device. During the execution of the alignment between the power transmitting unit and the power receiving unit using the image taken by the photographing device, the second light emitting body is turned on and the first light emitting body is turned off.

In the power transmission system of the present disclosure, during the execution of foreign matter detection, the first light emitter provided in the power transmission device is turned on, and the foreign matter can be detected by detecting the light shielding or reflected light by the foreign matter with the photographing device. can. On the other hand, if the first light emitter lights up when the alignment between the power transmission unit and the power reception unit is executed, the detection accuracy of the power reception unit by the photographing device may decrease due to light reflection or interference on the lower surface of the vehicle body. In the transmission system, the second light emitting body provided in the power receiving device is turned on and the first light emitting body is turned off during the execution of the alignment. As a result, the power receiving unit can be detected accurately by the photographing device. As described above, according to the power transmission system of the present disclosure, it is possible to secure the detection accuracy of foreign matter detection and alignment using the photographing device.

It is a schematic block diagram of the power transmission system according to the embodiment of this disclosure. It is an exploded perspective view which shows the structural example of a power transmission unit. It is a figure explaining the method of detecting a foreign substance by a camera. It is a figure which showed the relative positional relationship between a power transmission unit and a power receiving unit at the time of alignment of a power transmission unit and a power receiving unit. It is a top view of the power receiving device. It is a flowchart which shows an example of the procedure of the process executed by the control unit of a power transmission device and the vehicle ECU of a vehicle. It is a timing chart explaining the lighting / extinguishing timing of the 1st and 2nd light emitters. It is a flowchart which shows an example of the procedure of the process executed by the control unit of a power transmission device and the vehicle ECU of a vehicle in a modification. It is a timing chart explaining the lighting / extinguishing timing of the 1st and 2nd light emitting bodies in the modification.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. The same or corresponding parts in the drawings are designated by the same reference numerals, and the description thereof will not be repeated.

FIG. 1 is a schematic configuration diagram of a power transmission system according to the embodiment of the present disclosure. In the figure, the arrow D indicates the lower part in the vertical direction, and the arrow U indicates the upper part in the vertical direction. With reference to FIG. 1, the power transmission system includes a power transmission device 100 and a vehicle 200. The power transmission device 100 includes a power transmission unit 110, a control unit 140, and a communication device 150. The vehicle 200 includes a power receiving device 210, a power storage device 220, a vehicle ECU (Electronic Control Unit) 230, and a communication device 240.

The power transmission unit 110 includes a power transmission coil (not shown), a camera 120, and a first light emitter 122. The power transmission unit 110 receives power from an AC power source 300 (for example, a commercial system power source). Then, the power transmission unit 110 transmits power to the power reception unit 212 in a non-contact manner through a magnetic field in a state where the vehicle 200 is aligned so that the power reception unit 212 (described later) of the vehicle 200 faces the power transmission unit 110. It is composed.

The camera 120 is a sensor that detects foreign matter that is interposed between the power transmission unit 110 and the power reception unit 212, and is a sensor for aligning the power transmission unit 110 and the power reception unit 212.

The foreign substance is a substance that should not exist between the power transmission unit 110 and the power reception unit 212, and is assumed to be, for example, a metal piece such as a beverage can or money, an animal, or the like. Further, "detecting foreign matter" may include detecting intruders around the power transmission unit 110 in addition to detecting foreign matter intervening between the power transmission unit 110 and the power receiving unit 212. In the following, "detecting foreign matter" includes detecting intruders around the power transmission unit 110.

The camera 120 includes a fisheye lens and is provided at a substantially central portion on the upper surface of the power transmission unit 110. By providing the fisheye lens, the camera 120 is configured to be capable of photographing a wide space between the power transmission unit 110 and the power reception unit 212 and a wide space around the power transmission unit 110. Foreign matter between the power transmission unit 110 and the power receiving unit 212 can be detected by using such a captured image of the camera 120, and further, power transmission is performed by calculating the relative positional relationship between the camera 120 and the power receiving unit 212. The unit 110 and the power receiving unit 212 can be aligned with each other.

The first light emitting body 122 is a light source whose lighting / extinguishing is controlled by the control unit 140, and is provided on the power transmission unit 110. In this embodiment, the first light emitting body 122 is provided on the upper surface of the power transmission unit 110 in a ring shape along the outer circumference of the power transmission unit 110. The first light emitting body 122 is, for example, an LED (Light Emitting Diode), and emits light emitted from the first light emitting body 122 so that the camera 120 can take a picture.

The control unit 140 includes a CPU (Central Processing Unit), a memory (ROM (Read Only Memory) and RAM (Random Access Memory)), an input / output port for inputting / outputting various signals, and the like (none of which are shown). .. The control unit 140 controls the power transmission to the power receiving unit 212 by the power transmission unit 110 based on the information stored in the memory and the information from various sensors, and also detects and aligns foreign matter using the camera 120 (power transmission unit 110). And the power receiving unit 212). The various processes executed by the control unit 140 are not limited to the processes performed by software, but can also be processed by dedicated hardware (electronic circuits).

The communication device 150 is a device for wireless communication with the vehicle 200, and is configured to be capable of bidirectional communication with the communication device 240 provided in the vehicle 200.

On the other hand, in the vehicle 200, the power receiving device 210 includes a power receiving unit 212, protective members 214, 215, and second light emitting bodies 216, 217. The power receiving unit 212 includes a power receiving coil (not shown), and receives power from the power transmission unit 110 in a non-contact manner through a magnetic field in a state where the vehicle 200 is aligned so that the power receiving unit 212 faces the power transmission unit 110 of the power transmission device 100. It is configured to do. The protective members 214 and 215 are arranged on the vehicle rear side and the vehicle front side of the power receiving unit 212, respectively, to protect the power receiving unit 212 from road surface interference.

The second light emitters 216 and 217 are light sources whose lighting / extinguishing is controlled by the vehicle ECU 230. In this embodiment, the second light emitting body 216 is arranged between the power receiving unit 212 and the protective member 214, and the second light emitting body 217 is arranged between the power receiving unit 212 and the protective member 215. .. The second light emitting bodies 216 and 217 are, for example, LEDs, and the light emitted from the second light emitting bodies 216 and 217 is photographed by the camera 120 of the power transmission device 100 when the power transmission unit 110 and the power receiving unit 212 are aligned. It emits light as much as possible.

The electric power (alternating current) received by the power receiving unit 212 is rectified by a rectifying unit (not shown) and stored in the power storage device 220. The power storage device 220 is a rechargeable DC power source, and includes a secondary battery such as a lithium ion battery or a nickel hydrogen battery. The power storage device 220 stores the electric power received by the power receiving unit 212. The electric power stored in the power storage device 220 is supplied to a traveling motor or the like (not shown) and used to generate a driving force for the vehicle 200 or the like. An electric double layer capacitor or the like can also be used as the power storage device 220.

The vehicle ECU 230 includes a CPU, a memory (ROM and RAM), input / output ports for inputting / outputting various signals (none of which are shown), and is based on information stored in the memory and information from various sensors. In addition to controlling the power reception from the power transmission unit 110 by the power receiving unit 212, the lighting / extinguishing of the second light emitters 216 and 217 is controlled during the execution of foreign matter detection and alignment using the camera 120 (details will be described later). The various processes executed by the vehicle ECU 230 are not limited to the processes performed by software, but can also be processed by dedicated hardware (electronic circuits).

The communication device 240 is a device for wireless communication with the power transmission device 100, and is configured to be capable of bidirectional communication with the communication device 150 provided in the power transmission device 100.

FIG. 2 is an exploded perspective view showing a configuration example of the power transmission unit 110. With reference to FIG. 2, the power transmission unit 110 includes a power transmission coil 410, a housing 430, a camera 120, and a first light emitter 122.

The power transmission coil 410 includes a ferrite core 440 and a conductor 450 wound around the core 440. The wound conductor 450 may be arranged on the core 440. Further, although not particularly shown, the power transmission unit 110 is provided with a capacitor connected to the power transmission coil 410 (lead wire 450) to form a resonance circuit with the power transmission coil 410, and the Q value indicating the resonance strength of the resonance circuit is It is preferably 100 or more. The power transmission coil 410 is housed in the housing 430. The housing 430 includes a shield 432 and a lid member 434.

The camera 120 is provided at a substantially central portion of the lid member 434. As described above, the camera 120 is provided with a fisheye lens, and is configured to be capable of photographing the space between the power transmission unit 110 and the power reception unit 212 and the wide space around the power transmission unit 110. The first light emitting body 122 is provided on the upper surface of the lid member 434 in a rectangular ring shape along the outer circumference of the lid member 434. The first light emitting body 122 emits the light emitted from the first light emitting body 122 so that the camera 120 can take a picture.

With reference to FIG. 1 again, in this embodiment, a camera 120 capable of photographing the space between the power transmission unit 110 and the power reception unit 212 and a wide space around the power transmission unit 110 is provided on the power transmission unit 110. Be done. Then, using the image taken by the camera 120, foreign matter (including not only foreign matter existing between the power transmission unit 110 and the power receiving unit 212 but also intruders around the power transmission unit 110) is detected. , The power transmission unit 110 and the power reception unit 212 are aligned.

Here, it is conceivable to provide a marker on the power receiving surface of the power receiving unit 212 or the like, and perform positioning by detecting the marker with the camera 120. In this case, in order to enable the camera 120 to take a picture even in the dark, it is conceivable to make the first light emitting body 122 provided in the power transmission device 100 emit light to irradiate the marker. Detection accuracy may not be ensured.

Therefore, in the power transmission system according to this embodiment, the light emitting bodies (second light emitting bodies 216 and 217) are also provided on the power receiving device 210 side, and the second light emitting body provided in the power receiving device 210 is provided during the alignment. The bodies 216 and 217 are turned on, and the first light emitting body 122 provided in the power transmission unit 110 is turned off. As a result, the position of the power receiving device 210 can be accurately detected by the camera 120. On the other hand, while the foreign matter detection is being executed, the first light emitting body 122 provided in the power transmission unit 110 lights up, and the foreign matter can be detected by detecting the light shielding or reflected light by the foreign matter with the camera 120.

FIG. 3 is a diagram illustrating a method of detecting a foreign object by the camera 120. With reference to FIG. 3, when the foreign matter detection is executed, the control unit 140 (FIG. 1) turns on the first light emitting body 122. When the foreign matter 500 is present on the power transmission unit 110, a part of the light emitted from the first light emitting body 122 is blocked by the foreign matter 500. Therefore, there is a difference in the captured image of the camera 120 between the case where the foreign matter is not present on the power transmission unit 110 and the case where the foreign matter 500 is present on the power transmission unit 110. Thereby, it is possible to detect whether or not the foreign matter 500 is present on the power transmission unit 110.

As described above, in this embodiment, the intruder 510 around the power transmission unit 110 can also be detected. Specifically, when the intruder 510 is present around the power transmission unit 110, the light emitted from the first light emitting body 122 is reflected by the intruder 510 and reaches the camera 120. Thereby, it is possible to detect whether or not the intruder 510 is present around the power transmission unit 110.

FIG. 4 is a diagram showing a relative positional relationship between the power transmission unit 110 and the power reception unit 212 when the power transmission unit 110 and the power reception unit 212 are aligned. With reference to FIG. 4, when the alignment is executed, the second light emitting body 216 (217) on the power receiving device side emits light. In the captured image of the camera 120, the gap G (transmission) between the camera 120 and the second illuminant 216 (217) is performed by a simple geometric calculation from the position of the second illuminant 216 with respect to the center of the image (the center of the camera 120). The vertical distance between the unit 110 and the power receiving unit 212) and the horizontal distance X between the camera 120 and the power receiving unit 212 (horizontal distance between the center of the power transmitting unit 110 and the center of the power receiving unit 212) can be calculated. ..

FIG. 5 is a plan view of the power receiving device 210. With reference to FIG. 5, in this embodiment, the number of the second light emitting body 216 provided on the rear side of the vehicle with respect to the power receiving unit 212 and the number of the second light emitting body 217 provided on the front side of the vehicle are different. As a result, when the camera 120 detects the relative positional relationship between the power transmission unit 110 and the power reception unit 212 during the execution of alignment, the front-rear direction of the vehicle 200 can be recognized from the captured image.

While the vehicle 200 is moving backward (including a temporary stop while moving backward), only the second light emitting body 216 provided on the rear side of the vehicle with respect to the power receiving unit 212 lights up, and the vehicle 200 is moving forward (temporarily moving forward). (Including stop), only the second light emitting body 217 provided on the front side of the vehicle with respect to the power receiving unit 212 is turned on, but the second light emitting bodies 216 and 217 are turned on regardless of the traveling direction of the vehicle 200. You may.

FIG. 6 is a flowchart showing an example of a processing procedure executed by the control unit 140 of the power transmission device 100 and the vehicle ECU 230 of the vehicle 200. With reference to FIG. 6, the control unit 140 of the power transmission device 100 communicates between the power transmission device 100 and the vehicle 200 when the vehicle 200 wishing to receive power from the power transmission device 100 approaches the power transmission device 100. It is determined whether or not the wireless communication is established by (step S10).

When wireless communication with the vehicle 200 is established (YES in step S10), the control unit 140 operates the camera 120 to perform alignment between the power transmission unit 110 and the power reception unit 212 (step S15). Further, the control unit 140 turns off the first light emitting body 122 provided on the power transmission unit 110 (step S20). This is because if the first light emitting body 122 is turned on during the alignment, the detection accuracy of the power receiving unit 212 by the camera 120 is lowered due to the reflection or interference of the light on the lower surface of the vehicle body of the vehicle 200. At this stage, the first light emitting body 122 is normally turned off. As will be described later, the second light emitters 216 and 217 provided in the vehicle 200 are lit during the alignment.

When the camera 120 is activated and the first light emitting body 122 is turned off, the control unit 140 starts the alignment process between the power transmission unit 110 and the power receiving unit 212 (step S25). Specifically, the control unit 140 calculates the relative positional relationship between the power transmission unit 110 and the power reception unit 212 from the position of the second light emitting body 216 in the captured image of the camera 120 by a predetermined geometric calculation. The control unit 140 may transmit information on the relative positional relationship between the power transmission unit 110 and the power reception unit 212, or an image captured by the camera 120 together with the information, to the vehicle 200 through the communication device 150.

Next, the control unit 140 determines whether or not the alignment between the power transmission unit 110 and the power reception unit 212 is OK (step S30). For example, when the horizontal distance between the power transmission unit 110 and the power reception unit 212 falls within a predetermined range, the control unit 140 determines that the alignment is OK.

When it is determined that the alignment between the power transmission unit 110 and the power receiving unit 212 is OK (YES in step S30), the control unit 140 transmits a notification to the vehicle 200 by the communication device 150 that the alignment is completed. At the same time, the mode is switched from the mode for executing the alignment process to the mode for executing the foreign matter detection (step S35). This mode switching is notified to the vehicle 200 through the communication device 150. As will be described later, the second light emitters 216 and 217 are turned off in the vehicle 200 in response to the notification of the mode switching from the alignment process to the foreign matter detection.

When the mode is switched in step S35, the control unit 140 turns on the first light emitting body 122 provided on the power transmission unit 110 (step S40). As a result, foreign matter detection using the image captured by the camera 120 becomes feasible. After that, the control unit 140 starts detecting foreign matter using the image captured by the camera 120 (step S45). Then, when the foreign matter detection is started, the control unit 140 starts power transmission from the power transmission unit 110 to the power reception unit 212 of the vehicle 200 (step S50).

Next, the control unit 140 determines whether or not to end the power transmission from the power transmission unit 110 (step S55). Upon receiving the charging completion notification from the vehicle 200, the control unit 140 determines that the power transmission is terminated. Then, when it is determined in step S55 that the power transmission is terminated (YES in step S55), the control unit 140 stops the camera 120 (step S60) and turns off the first light emitter 122 (step S65).

On the other hand, in the vehicle 200, when the wireless communication with the power transmission device 100 is established (YES in step S110), the vehicle ECU 230 lights the second light emitters 216 and 217 provided in the power receiving device 210 (step S120). When the vehicle 200 is moving backward (including a temporary stop during reverse movement), the vehicle ECU 230 lights the second light emitting body 216 provided on the rear side of the power receiving unit 212, and the vehicle 200 moves forward. If this is the case (including a temporary stop during forward movement), the second light emitting body 217 provided on the front side of the vehicle of the power receiving unit 212 shall be turned on, but the second light emitting body shall be turned on regardless of the traveling direction of the vehicle 200. Both 216 and 217 may be turned on.

Next, the vehicle ECU 230 determines whether or not the alignment between the power transmission unit 110 and the power reception unit 212 is completed (step S130). When the vehicle ECU 230 receives the notification from the power transmission device 100 that the alignment has been completed by the communication device 240, the vehicle ECU 230 determines that the alignment has been completed. Then, when it is determined in step S130 that the alignment is completed (YES in step S130), the vehicle ECU 230 turns off the second light emitters 216 and 217 (step S140).

After that, when the power transmission device 100 starts power transmission to the vehicle 200, the vehicle ECU 230 charges the power storage device 220 using the electric power received by the power receiving unit 212 (step S150).

Next, the vehicle ECU 230 determines whether or not the charging of the power storage device 220 is completed (step S160). Whether or not the charging of the power storage device 220 is completed is determined based on the SOC (State Of Charge) of the power storage device 220. Then, when it is determined that the charging of the power storage device 220 is completed (YES in step S160), the vehicle ECU 230 transmits a charging completion notification to the power transmission device 100 through the communication device 240, and then shifts the process to the end. ..

FIG. 7 is a timing chart for explaining the lighting / extinguishing timings of the first light emitting body 122 and the second light emitting bodies 216 and 217. With reference to FIG. 7, during the foreign matter detection mode, the first light emitting body 122 provided in the power transmission device 100 is turned on (ON), and the second light emitting bodies 216 and 217 provided in the power receiving device 210 of the vehicle 200 are turned off (ON). OFF).

On the other hand, during the alignment mode in which the transmission unit 110 and the power receiving unit 212 are aligned, the first light emitting body 122 provided in the power transmitting device 100 is turned off (OFF), and the second light emitting body provided in the power receiving device 210 is turned off. 216, 217 are lit (ON). As a result, a decrease in detection accuracy of the camera 120 due to light reflection or interference during alignment is suppressed, and the power receiving unit 212 can be detected accurately by the camera 120.

As described above, in this embodiment, during the execution of the foreign matter detection, the first light emitting body 122 provided in the power transmission device 100 lights up, and the foreign matter is detected by the camera 120 detecting the light shielding or reflected light by the foreign matter. Can be detected. On the other hand, if the first light emitting body 122 lights up when the power transmission unit 110 and the power receiving unit 212 are aligned, the detection accuracy of the power receiving unit 212 by the camera 120 may decrease due to light reflection or interference on the lower surface of the vehicle body. In this embodiment, the second light emitting bodies 216 and 217 provided in the power receiving device 210 are turned on and the first light emitting body 122 is turned off during the execution of the alignment. As a result, the power receiving unit 212 can be accurately detected by the camera 120. As described above, according to this embodiment, it is possible to secure the detection accuracy of foreign matter detection and alignment using the camera 120.

[Modification example]
In the above embodiment, while the alignment between the power transmission unit 110 and the power reception unit 212 is being executed, the second light emitting bodies 216 and 217 provided in the vehicle 200 are lit and the first light emitting body 122 provided in the power transmission device 100 is lit. Is turned off, and while the foreign matter detection is being executed, the first light emitting body 122 is turned on and the second light emitting bodies 216 and 217 are turned off. May be turned on. As a result, for example, when the position confirmation between the power transmission unit 110 and the power reception unit 212 is performed using the captured image of the camera 120 during power transmission from the power transmission unit 110 to the power reception unit 212, the power transmission device 100 to the vehicle 200 becomes the first. 2 The position confirmation can be performed in the power transmission device 100 without transmitting the lighting instructions of the light emitters 216 and 217 again.

FIG. 8 is a flowchart showing an example of a processing procedure executed by the control unit 140 of the power transmission device 100 and the vehicle ECU 230 of the vehicle 200 in this modified example. With reference to FIG. 8, this flowchart is different from the flowchart shown in FIG. 6 in that it includes step S170 instead of step S140.

That is, when the vehicle ECU 230 determines that the alignment between the power transmission unit 110 and the power reception unit 212 is completed (YES in step S130), the process shifts to step S150, and the power transmission from the power transmission device 100 is started. The power storage device 220 is charged.

Then, when the vehicle ECU 230 determines that the charging of the power storage device 220 is completed (YES in step S160), the second light emitters 216 and 217 are turned off (step S170), and then the process shifts to the end.

FIG. 9 is a timing chart for explaining the lighting / extinguishing timings of the first light emitting body 122 and the second light emitting bodies 216 and 217 in this modified example. With reference to FIG. 9, during the foreign matter detection mode, the first light emitting body 122 provided in the power transmission device 100 is lit (ON), and the second light emitting bodies 216 and 217 provided in the power receiving device 210 of the vehicle 200 are also lit (ON). ON). On the other hand, during the alignment mode, the first light emitting body 122 provided in the power transmission device 100 is turned off (OFF), and the second light emitting bodies 216 and 217 provided in the power receiving device 210 are turned on (ON).

As a result, it is possible to prevent a decrease in the detection accuracy of the camera 120 due to light reflection or interference during alignment, and the camera 120 can accurately detect the power receiving unit 212. Further, when switching the mode between the foreign matter detection and the alignment process, the mode can be switched by the power transmission device 100 alone without transmitting the lighting / extinguishing notification of the second light emitters 216 and 217 from the power transmission device 100 to the vehicle 200. can.

The embodiments disclosed this time should be considered to be exemplary in all respects and not restrictive. The scope of the present disclosure is shown by the scope of claims rather than the description of the embodiment described above, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

100 power transmission device, 110 power transmission unit, 120 camera, 122 first light emitter, 140 control unit, 150, 240 communication device, 200 vehicle, 210 power receiving device, 212 power receiving unit, 214,215 protective member, 216,217 second light emitting Body, 220 power storage device, 230 vehicle ECU, 300 AC power supply, 410 power transmission coil, 430 housing, 432 shield, 434 lid member, 440 core, 450 lead wire, 500 foreign matter, 510 intruder.

Claims (1)

Power transmission device and
Equipped with a power receiving device
The power transmission device
A power transmission unit configured to transmit power to the power receiving device in a non-contact manner,
An imaging device configured to photograph the surroundings of the power transmission unit, and
Including the first light emitting body provided on the power transmission unit
The power receiving device is
A power receiving unit configured to receive power from the power transmitting unit in a non-contact manner,
It includes a second light emitter that can be photographed by the photographing apparatus when the alignment between the power transmitting unit and the power receiving unit is performed.
During the execution of foreign matter detection for detecting whether or not a foreign matter is present between the power transmission unit and the power receiving unit using an image taken by the photographing device, the first light emitting body is turned on.
During the execution of the alignment using the image, the second illuminant is turned on and the first illuminant is turned off.
Wherein during execution of the foreign object detection, the first light emitter is turned, and said second light emitter is also turned, power transmission system using the image.

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