Invention titles: wireless power receiving systems, mobiles, and wheels
Technical field
[0001]
The present invention relates to a wireless power receiving system, a mobile body, and wheels.
Background technology
[0002]
Conventionally, there is known a wireless power supply technology in which a power transmission device installed on a road surface such as a road or a parking lot wirelessly supplies electric power to a power receiving device installed in a vehicle. For example, Patent Document 1 discloses a vehicle capable of receiving electric power from a power transmission device provided on a road surface by providing a power receiving device under the vehicle.
Prior art literature
Patent documents
[0003]
Patent Document 1: Japanese Unexamined Patent Publication No. 2018-088077
Outline of the invention
Problems to be solved by the invention
[0004]
However, in the above-mentioned conventional wireless power feeding technology, when the power transmission device installed on the road surface such as a road and the power receiving device installed on the vehicle traveling on the road surface are separated from each other, the power transmission device and the power receiving device are separated from each other. An obstacle such as a small animal or a metal may enter the space between the vehicle and the vehicle, and a vortex current may be generated around the obstacle to reduce the power receiving efficiency. In addition, small animals or metals that have entered between the power transmission device and the power reception device may be heated and ignite.
[0005]
An object of the present invention made in view of such circumstances is to provide a wireless power receiving system, a mobile body, and a wheel capable of improving the power receiving efficiency in wireless power feeding.
Means to solve problems
[0006]
The wireless power receiving system according to the present invention is
A power receiving device having a power receiving coil that receives electric power wirelessly supplied from a power transmitting coil of a power transmitting device installed on the road surface, and at least a part of the power receiving coil is housed in a wheel of a moving body.
Equipped with an in-vehicle device installed on the moving body and connected to the power receiving device so as to be energized.
The power receiving device transmits the received power to the in-vehicle device.
[0007]
The moving body according to the present invention is
With wheels
A power receiving device having a power receiving coil that receives electric power wirelessly supplied from a power transmitting coil of a power transmitting device installed on the road surface, and at least a part of the power receiving coil is housed in the wheel.
Equipped with an in-vehicle device that is connected to the power receiving device so that it can be energized.
The power receiving device transmits the received power to the in-vehicle device.
[0008]
The wheel according to the present invention is
It is a wheel of a moving body,
A power receiving device having a power receiving coil that receives electric power wirelessly supplied from a power transmitting coil of a power transmitting device installed on the road surface, and at least a part of the power receiving coil is housed in the wheel.
Equipped with an in-vehicle device that is connected to the power receiving device so that it can be energized.
The power receiving device transmits the received power to the in-vehicle device.
The invention's effect
[0009]
According to the present invention, it is possible to provide a wireless power receiving system, a mobile body, and a wheel that can improve the power receiving efficiency in wireless power supply.
A brief description of the drawing
[0010]
FIG. 1 is a schematic view schematically showing a wireless power receiving system according to an embodiment of the present invention using a cross section in the width direction of a wheel.
FIG. 2 is a schematic view schematically showing a tire / wheel assembly as an example of a wheel in a wireless power receiving system according to an embodiment of the present invention, using a cross section in the width direction of the wheel.
FIG. 3 is a functional block diagram schematically showing a configuration example of a control device in a wireless power receiving system according to an embodiment of the present invention.
Embodiment for carrying out the invention
[0011]
Hereinafter, the wireless power receiving system, the mobile body, and the wheels according to the embodiment of the present invention will be described with reference to the drawings. The same reference numerals are given to common parts and parts in each figure. In the present specification, the width direction of the wheel means a direction parallel to the rotation axis of the wheel. The radial direction of the wheel means a direction orthogonal to the rotation axis of the wheel.
[0012]
(Configuration of wireless power receiving system)
FIG. 1 shows a schematic view schematically showing a wireless power receiving system 1 according to an embodiment of the present invention using a cross section in the width direction of a wheel. The wireless power receiving system 1 is used for the mobile body 2 provided with the wheels 3 to receive electric power from the power transmission device 4 installed on the road surface. The wireless power receiving system 1 includes a power receiving device 5 and an in-vehicle device 6. At least a part of the power receiving device 5 is housed in the wheels 3 of the mobile body 2, and receives power supplied wirelessly from the power transmitting device 4 installed on the road surface. The in-vehicle device 6 is installed in the mobile body 2 and is connected to the power receiving device 5 so as to be energized. The power receiving device 5 wirelessly receives electric power from the power transmitting device 4 when the moving body 2 travels or stops on the road surface on which the power transmitting device 4 is installed. The power receiving device 5 transmits the received power to the in-vehicle device 6.
[0013]
The wireless power receiving system 1 may further include a control device 7. The control device 7 is communicably connected to the power receiving device 5 and the vehicle-mounted device 6 via an in-vehicle network such as a CAN (Controller Area Network). The control device 7 can control the power receiving device 5 and the vehicle-mounted device 6 to transmit the electric power received by the power receiving device 5 wirelessly to the vehicle-mounted device 6. The positions and numbers of the wheels 3, the power receiving device 5, the in-vehicle device 6, and the control device 7 in the moving body 2 shown in FIG. 1 are examples, and may be arbitrarily determined according to their uses and the like. can.
[0014]
The moving body 2 can travel on a road surface such as a road by means of wheels 3. The mobile body 2 is, for example, an automobile, but is not limited to this. In addition to automobiles such as passenger cars, trucks, buses, and two-wheeled vehicles, the moving body 2 includes wheels 3 such as agricultural vehicles such as tractors, construction or construction vehicles such as dump trucks, airplanes, bicycles, and wheelchairs. Can include any vehicle capable of traveling.
[0015]
The wheel 3 is used for moving the moving body 2. The wheel 3 has a ground contact surface in contact with a road surface such as a road in a state of being attached to the moving body 2. In the present embodiment, the wheel 3 is a tire / wheel assembly in which the tire 31 is mounted on the wheel 32, but the wheel 3 is not limited to this, and may be any wheel that can be attached to the moving body 2 described above. The "contact patch" of the wheel 3 means that when the wheel 3 is a tire / wheel assembly, the contact patch of the tire 31, that is, the tire 31 is mounted on the applicable rim, filled with the specified internal pressure, and loaded with the maximum load. The surface of the tire 31 in contact with the road surface in the state.
[0016]
In the present specification, the "applicable rim" is an industrial standard that is effective in the area where pneumatic tires are produced and used. In Japan, JATTA (Japan Automobile Tire Association) JATTA YEAR BOOK, and in Europe, ETRTO ( The European Tire and Rim Technical Organization's STANDARDS MANUAL, and in the United States, TRA (The Tire and Rim Association, Inc.)' s YEAR BOOK, etc. STANDARDS MANUAL refers to Measuring Rim, and TRA's YEAR BOOK refers to Design Rim), but in the case of sizes not listed in these industrial standards, it refers to rims with a width corresponding to the bead width of pneumatic tires. "Applicable rims" include sizes that may be included in the aforementioned industrial standards in the future in addition to current sizes. As an example of the "size to be described in the future", the size described as "FUTURE DEVELOPMENTS" in the 2013 version of ETRTO can be mentioned.
[0017]
In the present specification, the "specified internal pressure" refers to the air pressure (maximum air pressure) corresponding to the maximum load capacity of a single wheel in the applicable size and ply rating described in the above-mentioned industrial standards such as JATMA YEAR BOOK. In the case of a size not described in the above-mentioned industrial standard, it means the air pressure (maximum air pressure) corresponding to the maximum load capacity specified for each vehicle equipped with tires. Further, in the present specification, the "maximum load" means a load corresponding to the maximum load capacity of a tire of an applicable size described in the above-mentioned industrial standard, or a size not described in the above-mentioned industrial standard. Means the load corresponding to the maximum load capacity specified for each vehicle equipped with tires.
[0018]
FIG. 2 shows a schematic view schematically showing a tire / wheel assembly as an example of a wheel 3 in the wireless power receiving system 1 according to an embodiment of the present invention, using a cross section in the width direction of the wheel 3. ing.
[0019]
As shown in FIG. 2, the tire 31 has a pair of bead portions 311 and a pair of sidewall portions 312 and a tread portion 313. The bead portion 311 is configured such that when the tire 31 is attached to the rim portion 321 of the wheel 32, the radial inner side and the widthwise outer side thereof come into contact with the rim portion 321. The sidewall portion 312 extends between the tread portion 313 and the bead portion 311. The sidewall portion 312 is located radially outside the bead portion 311. The tread portion 313 is located radially outside the sidewall portion 312 and may include a contact patch of the tire 31.
[0020]
The tire 31 is made of rubber such as natural rubber and synthetic rubber, and may include parts made of metal such as steel such as carcass, belt and bead wire. For example, at least a portion of parts such as carcass, belts and bead wires may be made of non-magnetic material. As a result, the tire 31 maintains the strength of the tire 31, and the presence of metal between the power transmission device 4 and the power receiving device 5 causes an electromagnetic induction method from the power transmission device 4 to the power receiving device 5 as described later. It is possible to reduce the attenuation of the magnetic field generated by the power transmitting device 4 by the time it reaches the power receiving device 5 when the wireless power supply is performed, and to improve the power receiving efficiency of the power receiving device 5. However, at least a part of parts such as carcass, belt and bead wire may not be made of non-magnetic material.
[0021]
The non-magnetic material may include a paramagnetic material and a diamagnetic material having a small magnetic permeability. As the non-magnetic material, for example, a resin material containing a thermoplastic resin such as polyester and nylon, a thermosetting resin such as vinyl ester resin and unsaturated polyester resin, and other synthetic resins can be used. The resin material can further contain fibers such as glass, carbon, graphite, aramid, polyethylene, and ceramic as reinforcing fibers. As the non-magnetic material, not only resin but also any non-metal material including rubber, glass, carbon, graphite, aramid, polyethylene, ceramic and the like can be used. Further, as the non-magnetic material, a metal material containing a paramagnetic material such as aluminum or a diamagnetic material such as copper can be used.
[0022]
The wheel 32 has a cylindrical rim portion 321 for mounting the tire 31 and a disc portion 322 provided inside the rim portion 321 in the radial direction and supported and fixed to the hub 21 of the moving body 2. There is.
[0023]
The wheel 32 can be made of a metal such as steel, but is not limited to this. At least a part of the rim portion 321 of the wheel 32 may be formed of the above-mentioned non-magnetic material. As a result, while maintaining the strength of the wheel 32, the presence of metal such as steel between the power transmitting device 4 and the power receiving device 5 causes the magnetic field generated by the power transmitting device 4 to reach the power receiving device 5. It is possible to reduce the attenuation and, by extension, improve the power receiving efficiency of the power receiving device 5. However, at least a part of the rim portion 321 of the wheel 32 does not have to be made of a non-magnetic material.
[0024]
With reference to FIG. 1 again, the power transmission device 4 includes a power transmission coil (primary coil) 41. The power transmission device 4 is installed on the road surface such as a road and a parking lot. In the present embodiment, the power transmission device 4 is embedded in a road or the like, but at least a part of the power transmission device 4 may be installed so as to be exposed on the road surface. In the figure, the power transmission coil 41 is schematically shown for the sake of brevity.
[0025]
The power transmission coil 41 generates an alternating magnetic field based on the alternating current supplied from the power source. In this embodiment, sending The electric coil 41 is configured in an annular shape as a whole. In the present specification, the plane surrounded by the annular power transmission coil 41 is also referred to as the coil surface of the power transmission coil 41. In the power transmission coil 41, the coil surface of the power transmission coil 41 is substantially horizontal to the road surface (that is, the axial direction of the power transmission coil 41 is substantially perpendicular to the road surface so as to generate an AC magnetic field toward the upper side of the road surface). (Like) are arranged. The power transmission coil 41 included in the power transmission device 4 is wound around a core such as a ferrite core to form an annular shape as a whole, but the whole is not limited to this, and an AC magnetic field such as a coil spring or an air core coil can be generated. It may be any coil. As a result, when the wheel 3 passes over the power transmission device 4 while the moving body 2 is traveling or the like, wireless power supply can be performed from the power transmission coil 41 to the power reception coil 51 by an electromagnetic induction method.
[0026]
The power receiving device 5 includes a power receiving coil (secondary coil) 51. The power receiving coil 51 receives electric power wirelessly supplied from the power transmission coil 41 of the power transmission device 4. In the present embodiment, the power receiving coil 51 is configured as a whole in an annular shape. In the present specification, the plane surrounded by the annular power receiving coil 51 is also referred to as the coil surface of the power receiving coil 51. The power receiving coil 51 is arranged so that the coil surface of the power receiving coil 51 is substantially horizontal to the ground plane of the wheel 3 (that is, the axial direction of the power transmission coil 41 is substantially perpendicular to the road surface). As a result, an electromotive force due to electromagnetic induction is generated in the power receiving coil 51 based on the AC magnetic field generated by the power transmission coil 41, and a current flows through the power receiving coil 51. The power receiving coil 51 included in the power receiving device 5 is wound around a core such as a ferrite core and has an annular structure as a whole. Based on this, any coil capable of generating an electromotive force can be used. In the figure, the power receiving coil 51 is schematically shown for the sake of brevity.
[0027]
At least a part of the power receiving coil 51 is housed in the wheel 3 of the moving body 2. In this embodiment, at least a part (preferably all) of the coil surface of the power receiving coil 51 faces the ground plane of the wheel 3. As a result, when the ground plane of the wheel 3 is located above the power transmission coil 41, including the case where the coil surface of the power receiving coil 51 does not extend substantially parallel to the ground plane of the wheel 3, the coil of the power receiving coil 51 At least a part of the surface can face at least a part of the coil surface of the transmission coil 41 with the ground plane of the wheel 3 interposed therebetween. Therefore, the possibility that an obstacle may enter between the power transmission coil 41 and the power reception coil 51 can be reduced, and the power reception coil 51 can appropriately receive the magnetic field lines emitted from the power transmission coil 41. Therefore, the power receiving efficiency in wireless power supply can be further improved.
[0028]
Here, in the present specification, for example, "at least a part of the surface A" is "opposed" to the surface B in a region extending in a direction perpendicular to the surface B in the range in which the surface B extends (at least a part thereof). In other words, it means that (at least a part of) surface A overlaps (in a columnar region) having surface B as a cross section.
[0029]
In the present embodiment, at least a part (preferably all) of the ground contact surface of the wheel 3 faces the coil surface of the power receiving coil 51. From the viewpoint of further improving the power receiving efficiency, at least a part (preferably all) of the coil surface of the power receiving coil 51 faces the ground plane of the wheel 3 and / or the wheel 3 as in the present embodiment. It is preferable that at least a part (preferably all) of the ground plane of the power receiving coil 51 faces the coil surface of the power receiving coil 51.
[0030]
The power receiving coil 51 of the power receiving device 5 can be accommodated in the wheel 3 of the moving body 2 by any configuration. For example, as shown in FIG. 2, the power receiving coil 51 may be installed in a portion of the moving body 2 such as a hub 21 that is attached to the wheel 3 from the radial inside of the wheel 3. As a result, in a state where the wheel 32 of the wheel 3 is attached to the hub 21 of the moving body 2, at least a part of the power receiving coil 51 is accommodated inside the wheel 32 in the radial direction.
[0031]
Further, even if the power receiving device 5 is installed on the inner peripheral surface of the rim portion 321 of the wheel 32 so that the inner peripheral surface of the rim portion 321 and the coil surface of the power receiving coil 51 are substantially parallel to each other, the power receiving device 5 of the wheel 32. It may be installed on the outer peripheral surface of the rim portion 321. Further, the power receiving device 5 may be installed on the inner peripheral surface of the tread portion 313 of the tire 31, or may be installed inside the tread portion 313 of the tire 31. By installing the power receiving device 5 at a position closer to the ground plane of the tire 31 in this way, the power receiving efficiency of the power receiving device 5 can be further improved. Further, by installing the power receiving device 5 on the inner peripheral surface of the rim portion 321 of the wheel 32, it is possible to reduce the possibility that the power receiving device 5 will be damaged when the tire 31 is punctured.
[0032]
The power receiving device 5 may further include a power conversion unit, a power storage unit, a measurement unit, and the like, in addition to the power receiving coil 51.
[0033]
The power conversion unit converts the power generated in the power receiving coil 51 into DC power. The power conversion unit includes, for example, an AC / DC converter and the like.
[0034]
The power storage unit stores the electric power generated in the power receiving coil 51. The power storage unit can be, for example, a capacitor. When the power storage unit is a capacitor, it can be charged and discharged in a shorter time than a storage battery or the like, which is advantageous in a situation where high responsiveness is required.
[0035]
The measuring unit measures the strength of the electric power received by the power receiving device 5. The measuring unit is, for example, a voltmeter or an ammeter, but is not limited thereto. The intensity of electric power measured by the measuring unit 54 may include arbitrary numerical information such as electric power, electric energy, voltage, current, magnetic flux, or magnetic flux density.
[0036]
With reference to FIG. 1 again, the in-vehicle device 6 is installed in the mobile body 2 and is connected to the power receiving device 5 so as to be energized. The power receiving device 5 and the in-vehicle device 6 may be connected so as to be energized by wire. In such a case, the power transmission efficiency from the power receiving device 5 to the in-vehicle device 6 is improved as compared with the case where the power receiving device 5 is connected wirelessly. Further, the power receiving device 5 and the in-vehicle device 6 may be wirelessly connected so as to be energized. In such a case, for example, wiring of a power transmission line for transmitting power from the power receiving device 5 to the in-vehicle device 6 installed in the main body of the moving body 2 separated from the wheel 3 becomes unnecessary, so that the power transmission line accompanies the rotation of the wheel 3. The risk of disconnection is reduced.
[0037]
The in-vehicle device 6 may include, for example, a drive device 61 that drives the wheels 3 by electric power. In such a case, the drive device 61 consumes the electric power supplied from the power receiving device 5 to drive the wheels 3. In the present embodiment, the drive device 61 is an in-wheel motor in which at least a part thereof is housed in the wheel 3, but the drive device 61 is not limited to this. The drive device 61 may be an on-board motor mounted on the main body of the moving body 2 and driving the wheels 3 by driving the shaft 22 of the moving body 2.
[0038]
Further, for example, the in-vehicle device 6 may include a power storage device 62 for storing electric power. The power storage device 62 can store the electric power supplied from the power receiving device 5 and supply the electric power to the other in-vehicle device 6. The power storage device 62 may be, for example, a lead storage battery, a nickel hydrogen storage battery, a lithium ion battery, a sodium-sulfur battery, or any storage battery such as a combination thereof.
[0039]
The in-vehicle device 6 is not limited to the above-mentioned example, and may include any electronic device installed in the mobile body 2, such as a communication device of the mobile body 2, a car navigation system, a media player, and an in-vehicle sensor. good. The in-vehicle device 6 may be installed integrally with the moving body 2 or may be detachably installed.
[0040]
The control device 7 controls at least one of the power receiving device 5 and the in-vehicle device 6. The control device 7 is, for example, a control device (ECU), but is not limited to this, and may be any electronic device. The control device 7 may be connected to the power receiving device 5 so as to be energized as one of the above-mentioned in-vehicle devices 6.
[0041]
FIG. 3 shows a functional block diagram schematically showing a configuration example of the control device 7. As shown in FIG. 3, the control device 7 includes a control unit 71, a storage unit 72, a communication unit 73, an output unit 74, and an input unit 75. The control unit 71 is electrically connected to each of the storage unit 72, the communication unit 73, the output unit 74, and the input unit 75.
[0042]
The control unit 71 includes at least one processor in order to provide control and processing power for executing various functions. The control unit 71 may be a general-purpose processor such as a CPU that executes a program that defines a control procedure, or a dedicated processor that specializes in processing each function. The control unit 71 can control each of the storage unit 72, the communication unit 73, the output unit 74, and the input unit 75, which will be described later, in order to realize the functions of the storage unit 72, the communication unit 73, the output unit 74, and the input unit 75.
[0043]
The storage unit 72 stores the processing for controlling each function of the control device 7, the information and the program used for the processing, and the like. The storage unit 72 may be, for example, a semiconductor memory, a magnetic memory, an optical memory, or the like. The storage unit 72 can function as, for example, a main storage device or an auxiliary storage device. The storage unit 72 may be a cache memory or the like included in the control unit 71. Further, the storage unit 72 may be a volatile storage device or a non-volatile storage device. In the present embodiment, the storage unit 72 stores, for example, the conditions used when the power receiving device 5 selects the in-vehicle device 6 for transmitting the electric power received wirelessly, as will be described in detail later.
[0044]
The communication unit 73 is an arbitrary communication such as a CAN communication module, a wired LAN (local area network) communication module, a wireless LAN communication module, and a mobile communication module corresponding to mobile communication standards such as 4G (Generation) and 5G. Contains modules. As a result, the communication unit 73 can communicate with another in-vehicle device 6 installed in the mobile body 2, an electronic device outside the mobile body 2, or the like by wire or wirelessly.
[0045]
The output unit 74 outputs information by sound, vibration, light, an image, or the like. The output unit 74 may include at least one such as a speaker, an oscillator, a light, and a display device. The output unit 74 can output information on the electric power received by the power receiving device 5 wirelessly, information on the in-vehicle device 6 to which the power receiving device 5 is supplying power, and the like. For example, when the power receiving device 5 is receiving power wirelessly, the control unit 71 causes the output unit 74, which is a display device, to display information to notify the user that the power is being supplied wirelessly. Can be done.
[0046]
The input unit 75 accepts an input operation from the user. The input unit 75 is, for example, an input device such as a touch panel, but is not limited thereto. When the input unit 75 receives an input operation by the user, the input unit 75 transmits the input operation as electronic information to the control unit 71. The input operation may include, for example, an instruction to start a process in which the power receiving device 5 wirelessly receives power.
[0047]
Hereinafter, the control method of the power receiving device 5 and the in-vehicle device 6 implemented in the wireless power receiving system 1 will be described in detail with reference to FIG. This control method can be executed, for example, by the control device 7 included in the wireless power receiving system 1. Further, it is assumed that at least the drive device 61 and the power storage device 62 are installed in the mobile body 2 as the in-vehicle device 6.
[0048]
(Example 1: Control of power transmission from a power receiving device to an in-vehicle device)
Based on predetermined conditions, the control device 7 transmits power received by the power receiving device 5 wirelessly to the power receiving device 5 to at least one of a plurality of vehicle-mounted devices 6 including, for example, a driving device 61 and a power storage device 62. Can be made to.
[0049]
For example, the predetermined condition is the condition of the strength of the electric power received by the power receiving device 5 wirelessly. The control device 7 receives, for example, when the intensity of the power received wirelessly by the power receiving device 5 measured by the measuring unit of the power receiving device 5 is less than a predetermined reference value.The electric device 5 may be controlled to transmit power only to the drive device 61. Further, for example, when the strength of the electric power received by the power receiving device 5 is equal to or higher than a predetermined reference value, the control device 7 controls the power receiving device 5 to transmit power to both the drive device 61 and the power storage device 62. May be good.
[0050]
Further, for example, the predetermined condition may be the condition of the traveling state of the moving body 2. For example, when the moving body 2 is moving, the control device 7 may control the power receiving device 5 to transmit power to the driving device 61. Further, for example, when the mobile body 2 is stopped, the control device 7 may control the power receiving device 5 to transmit power to the power storage device 62.
[0051]
Further, for example, the predetermined condition may be the condition of the charging state of the power storage device 62. For example, when the charge rate of the power storage device 62 is less than a predetermined reference, the control device 7 may control the power receiving device 5 to give priority to the power storage device 62 to transmit electric power. Further, for example, when the charge rate of the power storage device 62 is equal to or higher than a predetermined reference, the control device 7 may control the power receiving device 5 to give priority to the drive device 61 to transmit electric power.
[0052]
(Example 2: Travel control of a moving body according to the amount of power received)
When the control device 7 is an ECU, the control device 7 can control the traveling of the moving body 2 based on the condition of the strength of the electric power received by the power receiving device 5 wirelessly. The traveling control of the moving body 2 by the control device 7 may be a control that supports a part of the driver's operation of the moving body 2, or may be an automatic operation that does not depend on the driver's operation. In the present specification, the automatic operation means that the control device 7 moves in a state where the moving body 2 does not carry an occupant including a driver, or a state in which the occupant of the moving body 2 is not involved in the traveling of the moving body 2. It refers to performing acceleration, deceleration, steering, etc. of the body 2. For example, the control device 7 can control the drive device 61, the brake, the transmission, and the like of the mobile body 2 to perform acceleration, deceleration, steering, and the like of the mobile body 2. In the automatic operation in the present specification, the control device 7 performs remote control such as acceleration, deceleration, and steering of the moving body 2 based on a control signal from an external device communicably connected to the control device 7. Is also included.
[0053]
The control device 7 controls the drive device 61 and the brake, for example, when the intensity of the electric power received by the power receiving device 5 wirelessly measured by the measuring unit of the power receiving device 5 is less than a predetermined reference value. Therefore, the speed of the moving body 2 may be reduced to extend the time for the power receiving device 5 to receive power. Further, for example, when the intensity of the power received by the power receiving device 5 wirelessly measured by the measuring unit of the power receiving device 5 is less than a predetermined reference value, the control device 7 controls the transmission to receive power. The moving body 2 may be driven so that the wheel 3 is located on the power transmission device 4 so that the area of ​​the power receiving coil 51 of the device 5 and the power transmission coil 41 of the power transmission device 4 facing each other is large.
[0054]
Further, for example, in the control device 7, when the moving body 2 is stopped at a stop position near a traffic light, a parking lot, or the like, the strength of the electric power received by the power receiving device 5 wirelessly, which is measured by the measuring unit of the power receiving device 5. However, the vehicle may be stopped at a position where the value is equal to or higher than a predetermined reference value.
[0055]
Hereinafter, a modified example of the wireless power receiving system 1 according to the embodiment of the present disclosure will be described.
[0056]
The power receiving coil 51 of the power receiving device 5 may be capable of supplying electric power in both directions. In other words, the power receiving coil 51 of the power receiving device 5 can operate as a power receiving coil and may also operate as a power transmission coil. When the power receiving coil 51 operates as a power transmission coil, it generates an alternating magnetic field based on an alternating current supplied from a power source. For example, the power source can be a power storage device 62 that is electrically connected to the power receiving device 5. As a result, the power receiving device 5 can wirelessly supply power from the power receiving coil 51.
[0057]
In the modified example, the power receiving device 5 can receive the electric power wirelessly supplied from the power transmitting device 4 installed on the road surface, and can supply the electric power wirelessly to the power receiving device installed on the road surface. Specifically, the power receiving device 5 operates as a power receiving device when the moving body 2 travels or stops on the road surface on which the power transmitting device 4 is installed, and can receive electric power wirelessly from the power transmitting device 4. can. On the other hand, the power receiving device 5 operates as a power transmitting device when the moving body 2 travels or stops on the road surface on which the power receiving device is installed, and wirelessly transmits power to the power receiving device installed on the road surface. can do. As a result, even when the power receiving device 5 of the moving body 2 operates as a power transmission device, at least a part of the power receiving coil 51 is accommodated in the wheel 3 that is in direct contact with the road surface, so that the power receiving coil 51 and the road surface are installed. It is possible to reduce the possibility that an obstacle will enter the space between the power receiving device and the power receiving device.
[0058]
In this modification, for the sake of simplicity of explanation, an example in which a power receiving device is installed on the road surface is shown, but this is not the case. For example, the power transmission device 4 installed on the road surface may be capable of supplying electric power in both directions. In such a case, the power receiving device 5 installed in the mobile body 2 can supply electric power bidirectionally to the power transmission device 4 installed on the road surface.
[0059]
As described above, the wireless power receiving system 1 according to the embodiment of the present invention has a power receiving coil 51 that receives power wirelessly supplied from the power transmission coil 41 of the power transmission device 4 installed on the road surface, and receives power. It includes a power receiving device 5 in which at least a part of the coil 51 is housed in the wheels 3 of the moving body 2, and an in-vehicle device 6 installed in the moving body 2 and connected to the power receiving device 5 so as to be energized. The device 5 transmits the received electric power to the in-vehicle device 6. According to this configuration, the wheel 3 in direct contact with the road surface accommodates at least a part of the power receiving coil 51, so that an obstacle is created in the space between the power transmitting coil 41 and the power receiving coil 51 provided on the road surface. The risk of entry can be reduced. Therefore, the wireless power receiving system 1 can improve the power receiving efficiency in wireless power supply.
[0060]
In the wireless power receiving system 1 according to the embodiment of the present invention, the in-vehicle device 6 includes a driving device 61 for driving the wheels 3 by electric power. According to such a configuration, since the wireless power receiving system 1 can receive the electric power for driving the mobile body 2 from the outside of the mobile body 2, the power storage device 62 installed in the mobile body 2 can be made smaller and lighter. It makes it possible, and by extension, makes it possible to improve the fuel efficiency of the moving body 2.
[0061]
In the wireless power receiving system 1 according to the embodiment of the present invention, the drive device 61 is an in-wheel motor in which at least a part thereof is housed in the wheels 3. According to such a configuration, in the wireless power receiving system 1, both the driving device 61 and the power receiving device 5 are housed in the wheels 3, so that the power received by the power receiving device 5 corresponds to the transmission distance to the driving device 61. It is possible to reduce the transmission loss.
[0062]
In the wireless power receiving system 1 according to the embodiment of the present invention, the in-vehicle device 6 includes a power storage device 62 for storing electric power. According to such a configuration, the wireless power receiving system 1 stores the electric power received from the outside of the mobile body 2 in the power storage device 62, and the mobile body 2 travels on a road surface on which the power transmission device 4 is not installed. At the timing of, the other in-vehicle device 6 can be supplied with electric power.
[0063]
In the wireless power receiving system 1 according to the embodiment of the present invention, the power receiving device 5 transmits the received power to at least one of the plurality of in-vehicle devices 6 based on a predetermined condition. According to such a configuration, the wireless power receiving system 1 transmits the electric power received from the outside of the mobile body 2 by the power receiving device 5 from among a plurality of in-vehicle devices according to conditions such as the traveling state of the mobile body 2. You can select and send it. For example, when the in-vehicle device 6 includes the drive device 61 and the power storage device 62, the wireless power receiving system 1 consumes power for driving the mobile body 2 by the drive device 61 according to conditions such as a running state of the mobile body 2. Or it can be stored in the power storage device 62.
[0064]
In the wireless power receiving system 1 according to the embodiment of the present invention, the power receiving device 5 and the in-vehicle device 6 are connected by wire so as to be energized. According to such a configuration, the wireless power receiving system 1 improves the power transmission efficiency from the power receiving device 5 to the vehicle-mounted device 6 as compared with the case where the power receiving device 5 and the vehicle-mounted device 6 are wirelessly connected to each other so as to be energized. Can be done.
[0065]
In the wireless power receiving system 1 according to the embodiment of the present invention, the power receiving device 5 and the in-vehicle device 6 are wirelessly connected so as to be energized. According to such a configuration, the wireless power receiving system 1 does not require wiring of a power transmission line for power transmission between the power receiving device 5 and the in-vehicle device 6, so that the possibility of disconnection of the power transmission line is reduced.
[0066]
In the wireless power receiving system 1 according to the embodiment of the present invention, the mobile body 2 can be automatically operated. According to such a configuration, the mobile body 2 can automatically control acceleration, deceleration, steering, and the like of the mobile body 2 according to the power receiving status from the outside of the mobile body 2.
[0067]
In the wireless power receiving system 1 according to the embodiment of the present invention, the wheel 3 is a tire / wheel assembly composed of a tire 31 and a wheel 32. According to such a configuration, the wheel 3 can further reduce the possibility that an obstacle enters a space between the tire 31 and the road surface because the tire 31 is deformed according to the shape of the road surface.
[0068]
In the wireless power receiving system 1 according to the embodiment of the present invention, at least a part of the coil surface of the power receiving coil 51 faces the ground plane of the wheel 3. According to such a configuration, the road surface on which the power transmission device 4 is provided and the ground surface of the wheel 3 are in direct contact with each other, so that the possibility that an obstacle may enter between the power transmission coil 41 and the power reception coil 51 can be reduced. The power receiving coil 51 can appropriately receive the magnetic field lines emitted from the power transmitting coil 41. The wireless power receiving system 1 can further improve the power receiving efficiency in wireless power supply.
[0069]
In the wireless power receiving system 1 according to the embodiment of the present invention, the power receiving coil 51 can supply electric power in both directions, and the power receiving device 5 wirelessly supplies electric power from the power receiving coil 51. According to such a configuration, the power receiving device 5 can not only receive power via the power receiving coil 51 but also transmit power. Therefore, by accommodating at least a part of the power receiving coil 51 in the wheel 3 that is in direct contact with the road surface, when power is supplied to the power receiving device provided on the road surface, the power receiving coil 51 and the power receiving coil provided on the road surface are supplied. It is possible to reduce the risk of obstacles entering the space between the device and the device.
[0070]
The moving body 2 according to the embodiment of the present invention has a wheel 3 and a power receiving coil 51 that receives electric power wirelessly supplied from a power transmitting coil 41 of a power transmitting device 4 installed on a road surface. A power receiving device 5 having at least a part housed in the wheels 3 and an in-vehicle device 6 connected to the power receiving device 5 so as to be energized are provided, and the power receiving device 5 transmits the received power to the in-vehicle device 6. .. According to this configuration, the wheel 3 in direct contact with the road surface accommodates at least a part of the power receiving coil 51, so that an obstacle is created in the space between the power transmitting coil 41 and the power receiving coil 51 provided on the road surface. The risk of entry can be reduced. Therefore, the mobile body 2 can improve the power receiving efficiency in the wireless power supply.
[0071]
The wheel 3 according to an embodiment of the present invention is the wheel 3 of the moving body 2 and has a power receiving coil 51 that receives power wirelessly supplied from the power transmission coil 41 of the power transmission device 4 installed on the road surface. A power receiving device 5 in which at least a part of the power receiving coil 51 is housed in a wheel 3 and an in-vehicle device 6 connected to the power receiving device 5 so as to be energized are provided. Power is transmitted to the device 6. According to this configuration, the wheel 3 in direct contact with the road surface accommodates at least a part of the power receiving coil 51, so that an obstacle is created in the space between the power transmitting coil 41 and the power receiving coil 51 provided on the road surface. The risk of entry can be reduced. Therefore, the wheel 3 can improve the power receiving efficiency in wireless power supply.
[0072]
Although the present invention has been described based on various drawings and embodiments, those skilled in the art can make various modifications and modifications based on the present invention.Note that and is easy. Therefore, it should be noted that these modifications and modifications are within the scope of the present invention. For example, the configurations or functions included in each embodiment or each embodiment can be rearranged so as not to be logically inconsistent. Further, the configuration or function included in each embodiment can be used in combination with other embodiments or other embodiments, and a plurality of configurations or functions may be combined into one, divided into one, or one. It is possible to omit the part.
[0073]
For example, in the above-described embodiment, all or part of the functions or processes described as the functions or processes of the control device 7 may be realized as the functions or processes of the power receiving device 5 or the in-vehicle device 6. For example, a program describing processing contents for realizing each function of the control device 7 according to the embodiment is stored in a memory or the like provided in the power receiving device 5 or the in-vehicle device 6, and the processor of the power receiving device 5 or the in-vehicle device 6 is used to store the program. The program may be read and executed.
[0074]
Further, for example, in the above-described embodiment, the coil surface of the power receiving coil 51 has been described as being arranged so as to be substantially parallel to the ground plane of the wheel 3, but this is not the case. The coil surface of the power receiving coil 51 may be arranged at an arbitrary angle of 0 to 90 degrees with the ground plane of the wheel 3. The angle between the coil surface of the power receiving coil 51 and the ground plane of the wheel 3 may be arbitrarily determined according to the application of the power receiving device 5, the amount of power to be received, and the like.
[0075]
Further, for example, in the above-described embodiment, the tire 31 has been described as being filled with air, but this is not the case. For example, the tire 31 can be filled with a gas such as nitrogen. Further, for example, the tire 31 can be filled with an arbitrary fluid including a liquid, a gel-like substance, a powder or granular material, or the like, in place of or in addition to the gas.
Code description
[0076]
1: Wireless power receiving system, 2: Mobile body, 21: Hub, 22: Shaft, 3: Wheel, 31: Tire, 311: Bead part, 312: Sidewall part, 313: Tread part, 32: Wheel, 321: Rim Unit, 322: Disk unit, 4: Power transmission device, 41: Power transmission coil, 5: Power receiving device, 51: Power receiving coil, 6: In-vehicle device, 61: Drive device, 62: Power storage device, 7: Control device, 71: Control Unit, 72: Storage unit, 73: Communication unit, 74: Output unit, 75: Input unit
The scope of the claims
[Claim 1]
A power receiving device having a power receiving coil that receives electric power wirelessly supplied from a power transmitting coil of a power transmitting device installed on the road surface, and at least a part of the power receiving coil is housed in a wheel of a moving body.
Equipped with an in-vehicle device installed on the moving body and connected to the power receiving device so as to be energized.
The power receiving device is a wireless power receiving system that transmits the received power to the in-vehicle device.
[Claim 2]
The wireless power receiving system according to claim 1, wherein the in-vehicle device includes a drive device for driving the wheels with the electric power.
[Claim 3]
The wireless power receiving system according to claim 2, wherein the drive device is an in-wheel motor in which at least a part thereof is housed in the wheels.
[Claim 4]
The wireless power receiving system according to any one of claims 1 to 3, wherein the in-vehicle device includes a power storage device that stores the electric power.
[Claim 5]
The wireless power receiving system according to any one of claims 1 to 4, wherein the power receiving device transmits the received power to at least one of the plurality of in-vehicle devices based on a predetermined condition.
[Claim 6]
The wireless power receiving system according to any one of claims 1 to 5, wherein the power receiving device and the in-vehicle device are connected so as to be energized by wire.
[Claim 7]
The wireless power receiving system according to any one of claims 1 to 5, wherein the power receiving device and the in-vehicle device are wirelessly connected so as to be energized.
[Claim 8]
The wireless power receiving system according to any one of claims 1 to 7, wherein the mobile body is capable of automatic operation.
[Claim 9]
The wireless power receiving system according to any one of claims 1 to 8, wherein the wheel is a tire / wheel assembly composed of a tire and a wheel.
[Claim 10]
The wireless power receiving system according to any one of claims 1 to 9, wherein at least a part of the coil surface of the power receiving coil faces the ground plane of the wheel with the road surface.
[Claim 11]
The power receiving coil can supply electric power in both directions,
The wireless power receiving system according to any one of claims 1 to 10, wherein the power receiving device wirelessly supplies electric power from the power receiving coil.
[Claim 12]
With wheels
A power receiving device having a power receiving coil that receives electric power wirelessly supplied from a power transmitting coil of a power transmitting device installed on the road surface, and at least a part of the power receiving coil is housed in the wheel.
Equipped with an in-vehicle device that is connected to the power receiving device so that it can be energized.
The power receiving device is a mobile body that transmits the received power to the in-vehicle device.
[Claim 13]
It is a wheel of a moving body,
A power receiving device having a power receiving coil that receives electric power wirelessly supplied from a power transmitting coil of a power transmitting device installed on the road surface, and at least a part of the power receiving coil is housed in the wheel.
Equipped with an in-vehicle device that is connected to the power receiving device so that it can be energized.
The power receiving device is a wheel that transmits the received electric power to the in-vehicle device.