JP6330637B2 - Power receiving device - Google Patents

Description

  The present invention relates to a power receiving device that is mounted on a vehicle and receives power from a power transmitting device disposed below the vehicle in a contactless manner.

  2. Description of the Related Art Conventionally, a power transmission device provided on the ground side at a position where a vehicle stops and a power reception device provided on the vehicle and connected to an in-vehicle battery, wirelessly transmits power from the power transmission device to the power reception device on the vehicle side. There is known a power transmission system that transmits power by using (for example, see Patent Document 1). In this power transmission system, each of the power transmission device and the power reception device includes a spiral resonance coil, an electromagnetic induction coil, and a coil case made of, for example, resin that accommodates the resonance coil and the electromagnetic induction coil. A shield member is disposed along the bottom plate (top plate) in the coil case, and a core member is disposed on the shield member. And an electromagnetic induction coil and a resonance coil are arrange | positioned on the core member in a coil case, and each coil surrounding axis (winding axis) is extended in the up-down direction of a vehicle.

  Further, as a non-contact type power receiving device, a power receiving unit that includes a coil and can receive power in a non-contact manner, a temperature measuring device that estimates or detects the temperature of an electrical device connected to the power receiving unit, and a power receiving unit A device including a control device that estimates the temperature of an electric device based on a parameter related to power reception efficiency is known (see, for example, Patent Document 2). The control device of the power receiving device stops charging the power storage device via the power receiving unit when the measured value by the temperature measuring device is different from the estimated value estimated based on the parameter related to the power receiving efficiency of the power receiving unit. Let

JP 2012-120411 A JP 2013-135572 A

  When the winding axis of the power transmission side resonance coil and the power reception side resonance coil extends in the vertical direction of the vehicle as in the power transmission system described in Patent Document 1, when the power is transmitted from the power transmission device to the power reception device, the power transmission side Magnetic flux (linkage magnetic flux) from the resonance coil is directed upward. Therefore, when the electric power transmission system described in Patent Document 1 is used, magnetic flux easily flows into the lower part of the vehicle, and eddy currents due to the magnetic flux flow, so that the components of the vehicle such as the floor panel are heated. In particular, when the winding axis of each resonance coil extends in the vertical direction of the vehicle, a large amount of magnetic flux flows from the power transmission coil to the floor panel or the like when the power reception device and the power transmission device are misaligned. As a result, the floor panel and the like are easily heated. However, in the invention described in Patent Document 1, no consideration is given to the increase in the temperature of the constituent members of the vehicle accompanying power transmission from the power transmission device to the power reception device. Further, in the invention described in Patent Document 2, consideration is given to the increase in the temperature of the electrical equipment connected to the power receiving unit, but the increase in the temperature of the components of the vehicle accompanying the power transmission from the power transmission device to the power reception device is Not considered.

  In view of the above, the main object of the present invention is to satisfactorily suppress the temperature increase of the constituent members of the vehicle when power is supplied to the power receiving device mounted on the vehicle in a non-contact manner.

  A coil unit according to the present invention is mounted on a vehicle, and in a power receiving device that receives power from a power transmitting device disposed below the vehicle in a non-contact manner, a power receiving coil formed by winding a winding And a housing that is attached to a floor panel of the vehicle so that a winding shaft of the power receiving coil extends in a vertical direction of the vehicle, and is disposed around the power receiving coil. And at least one metal piece attached to the housing, a temperature sensor for detecting the temperature of the metal piece, and electric power transmitted from the power transmission device in accordance with the temperature detected by the temperature sensor. And a control device that outputs a command signal to the power transmission device.

  When electric power is supplied from such a power transmission device to such a power reception device in a contactless manner, the magnetic flux from the power transmission device flows into the vehicle equipped with the power reception device from below. Moreover, the magnetic flux from the power transmission device also flows into the metal piece of the housing attached to the floor panel of the vehicle from below. As a result, the temperature of the floor panel of the vehicle and its peripheral members and the metal piece of the housing are increased by the eddy current due to the magnetic flux from the power transmission device. Further, a correlation is recognized between the temperature of the metal piece and the temperature of the vehicle side such as a floor panel around the metal piece. For this reason, when the temperature of a metal piece rises, the position of the power receiving apparatus with respect to the power transmission apparatus is shifted from the planned normal position to the side where the metal piece is provided. Then, it can be assumed that the temperature of the floor panel and the like also rises due to such a positional deviation between the power receiving device and the power transmitting device. Therefore, when power is supplied from the power transmission device to the power reception device in a contactless manner, the power transmitted from the power transmission device is adjusted according to the temperature of the metal piece detected by the temperature sensor, so that the floor panel of the vehicle It becomes possible to satisfactorily suppress the high temperature of the constituent members. Furthermore, by providing a metal piece and a temperature sensor in the housing, it is not necessary to provide a plurality of temperature sensors in an exposed environment such as a vehicle floor panel.

  The power transmission device includes a power transmission coil formed by winding a winding, and is installed in a stop space of the vehicle so that a winding axis of the power transmission coil extends in a vertical direction of the vehicle. The dimension of the power transmission coil in the vehicle width direction of the vehicle may be larger than the dimension of the power transmission coil in the front-rear direction of the vehicle, and the metal piece is larger than the power reception coil. You may include the front side metal piece attached to the said housing | casing so that it may be located in the front part side, and the rear side metal piece attached to the said housing | casing so that it may be located in the rear part side of the said vehicle rather than the said receiving coil.

  In general, the positional deviation between the power receiving device and the power transmitting device is larger in the vehicle width direction than in the front-rear direction of the vehicle. Further, when the power receiving device and the power transmitting device are normally aligned in the front-rear direction of the vehicle, the portions located on the front side and the rear side of the winding of the power transmission coil are the front side or the rear side of the winding of the power receiving coil. It is magnetically coupled to the part located on the side. For this reason, in this power transmission device, the dimension of the power transmission coil in the vehicle width direction of the vehicle is determined to be larger than the dimension of the power transmission coil in the front-rear direction of the vehicle. Thereby, even if the position of the power receiving device with respect to the power transmitting device is shifted in the vehicle width direction, the portion of the winding of the power transmission coil located on the front side and the rear side of the vehicle, and the front side or the rear side of the winding of the power receiving coil on the vehicle It is possible to satisfactorily ensure a magnetically coupled state (overlapping length of the power receiving coil and the power transmitting coil) with the portion located at.

  On the other hand, when the portions located on the vehicle front side and the rear side of the winding of the power transmission coil and the portions located on the vehicle front side or the rear side of the winding of the power receiving coil are mainly combined as described above, the power receiving device for the power transmission device When the position shifts in the front-rear direction of the vehicle, a large amount of magnetic flux flows from the power transmission coil into a floor panel or the like located on the front side or rear side of the vehicle with respect to the power receiving coil. Based on this, when the power transmission coil is formed as described above, a front metal piece and a rear metal piece may be provided in the housing of the power receiving device. Thereby, when the position of the power receiving device with respect to the power transmitting device is shifted in the longitudinal direction of the vehicle, a large amount of magnetic flux flows into either the front metal piece or the rear metal piece. As a result, by adjusting the electric power transmitted from the power transmission device according to the temperatures of the front and rear metal pieces, it is possible to very well suppress the high temperature of the structural members such as the vehicle floor panel.

  Further, the metal piece is attached to the housing so as to be positioned on one side in the vehicle width direction of the vehicle with respect to the power receiving coil, and the other side in the vehicle width direction with respect to the power receiving coil. And the other metal piece attached to the housing so as to be located in the housing. Thereby, even if the stop position of the vehicle with respect to the power transmission device is shifted in the vehicle width direction of the vehicle, the temperature of the vehicle structural member is extremely increased based on the temperature of the one side metal piece and the other side metal piece of the casing. It becomes possible to suppress well.

  In addition, when the temperature detected by the temperature sensor exceeds the predetermined threshold when power is being supplied from the power transmission device to the power reception device, the control device issues a power transmission stop command to the power transmission device. It may be output. Thereby, it becomes possible to reduce the temperature of the component member of the heated vehicle.

  Further, the control device may store a correlation between the temperature of the metal piece and a required value of the transmission power for the power transmission device, and the power transmission device according to the temperature detected by the temperature sensor. The required value may be output, and the required value may be set to be smaller as the temperature detected by the temperature sensor is higher. As a result, it is possible to prevent power transmission from the power transmission device from being stopped as much as possible while suppressing the temperature increase of the constituent members of the vehicle.

It is a schematic block diagram of the electric power feeding system containing the power receiving apparatus by this invention. It is a fragmentary sectional view which shows the power receiving apparatus by this invention. It is a schematic block diagram which shows the power receiving apparatus by this invention. It is a schematic diagram which shows the power receiving apparatus by this invention. It is a fragmentary sectional view which shows the power transmission apparatus contained in the electric power feeding system of FIG. It is a top view which shows the power transmission apparatus of FIG. It is a graph which shows the relationship between the temperature of the metal piece provided in the housing | casing of the power receiving apparatus by this invention, and the temperature of the structural member of the vehicle carrying a power receiving apparatus. It is a flowchart which shows an example of the charge control routine performed by the control apparatus of the power receiving apparatus by this invention.

  Next, embodiments for carrying out the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic configuration diagram of a power feeding system 1 including a power receiving device 10 according to the present invention, and FIG. 2 is a partial cross-sectional view showing the power receiving device 10. A power supply system 1 shown in FIG. 1 is installed in a stop space of a vehicle such as a parking lot in addition to a power receiving device 10 mounted on a vehicle 100 that is a hybrid vehicle equipped with an engine EG, an electric motor MG, and a battery 200 (not shown). The power transmission device 20 is included.

  As shown in FIG. 1, the power receiving device 10 accommodates a winding type power receiving coil 11, a core member 110, a capacitor 12 connected in series to the power receiving coil 11 and constituting a resonance circuit together with the power receiving coil 11. For example, it has a resin casing 15 or the like. The power receiving device 10 is configured as a microcomputer including a communication antenna 104 and a CPU (not shown) and the like, and a charging control device (electronic control device) 105 that outputs a command signal to the power transmission device 20 via the communication antenna 104. Including. The communication antenna 104 and the charging control device 105 are not disposed inside the housing 15 but are disposed at predetermined mounting positions of the vehicle 100.

  The power receiving coil 11 is a flat spiral coil formed by winding a winding, for example, in a square shape on the same plane, and has an air core portion 11c surrounded by the winding. However, the power receiving coil 11 may be formed by winding the winding in a circular shape or a rectangular shape on the same plane, and if the coil is relatively low in height, the winding is spiral. It may be a spiral coil formed by being wound around.

  In this embodiment, the core member 110 is composed of a plurality of members formed of a ferromagnetic material such as ferrite, and as shown in FIG. 2, for example, a flange-shaped flat plate portion 111 having a square planar shape (contour). And a hollow projecting portion 112 projecting from a substantially central portion of the flat plate portion 111 to one side (upper side in FIG. 2). In the present embodiment, the projecting portion 112 of the core member 110 is formed in a covered cylindrical shape, and is, for example, a rectangular and short (low profile) wall portion 113 and a flat top plate that closes the tip of the wall portion 113. Part 114. Further, the flat plate portion 111 of the core member 110 extends from the base end portion of the projecting portion 112 (wall portion 113) perpendicularly to the wall portion 113 and outward (in the radial direction). Furthermore, the power receiving coil 11 is fixed to the flat plate portion 111 of the core member 110 so as to surround the protruding portion 112.

  That is, the core member 110 is fixed to the power receiving coil 11 so that the flat plate portion 111 and the top plate portion 114 are orthogonal to (intersect) the winding axis of the winding. The protruding portion 112 of the core member 110 is inserted into the air core portion 11 c of the power receiving coil 11, and the winding of the power receiving coil 11 extends along the outer peripheral surface of the protruding portion 112 (wall portion 113). Further, the capacitor 12 is disposed in the protruding portion 112 of the core member 110, and the capacitor 12 is fixed to the back surface (upper surface in FIG. 2) of the top plate portion 114. In the present embodiment, the power receiving coil 11, the core member 110, and the capacitor 12 are assembled as a single assembly. However, the capacitor 12 may be separated from the assembly and fixed to the housing 15.

  The casing 15 of the power receiving device 10 includes a base member 151 and a cover 152, both of which are made of resin. The base member 151 is formed in a flat plate shape, and has, for example, a square planar shape (contour). The cover 152 includes a top plate portion 153 having a square planar shape (contour), a pair of side wall portions 154x extending along the peripheral edge portion of the top plate portion 153 so as to face each other, and orthogonal to the side wall portions 154x. Thus, it has a pair of side wall part 154y extended along the peripheral part of the top-plate part 153 (refer FIG. 3). The cover 152 is fixed to the base member 151 such that the end surfaces of the side wall portions 154x and 154y are in contact with the surface of the base member 151 (the upper surface in FIG. 2). As a result, the base member 151 and the cover 152 define a receiving space for the power receiving coil 11, the core member 110, the capacitor 12, and the like. In the present embodiment, the power receiving coil 11 and the core member 110 are accommodated in the housing 15 such that the longitudinal direction of the core member 110 extends in parallel with the longitudinal direction of the base member 151. The housing 15 may be molded with respect to the power receiving coil 11, the capacitor 12, and the like.

  As shown in FIG. 3, from each side wall part 154x of the cover 152, the attachment flange part 155 fixed to the metal floor panel 101 of the vehicle 100 is extended via the bolt which is not shown in figure. In the present embodiment, the power receiving device 10 includes a winding axis (a central axis of the air core portion 11c) of the power receiving coil 11 (winding wire) extending in the vertical direction of the vehicle 100 and a housing 15 (cover 152). The side wall portion 154x is attached to the floor panel 101 of the vehicle 100 such that the side wall portion 154x extends in parallel with the front-rear direction of the vehicle 100. In addition, the top plate portion 153 of the cover 152 of the housing 15 is closer to the floor panel 101 than the base member 151, and the power receiving coil 11 is closer to the road surface than the flat plate portion 111 of the core member 110. Housed inside.

  Further, as shown in FIG. 4, a front metal piece 14 f and a rear metal piece 14 r are arranged inside the housing 15 of the power receiving device 10 so as to be positioned around the power receiving coil 11. The front metal piece 14f and the rear metal piece 14r are formed of a non-magnetic metal having high conductivity such as aluminum or copper so as to have a square planar shape of 10 to 15 mm square, for example. As shown in FIG. 4, the front metal piece 14 f is disposed between the central portion of the housing 15 in the vehicle width direction and the side wall portion 154 y on the front portion side of the vehicle 100 and the peripheral edge portion 111 y of the core member 110 facing it. It is located on the front side of the vehicle 100 with respect to the power receiving coil 11. In the present embodiment, the front metal piece 14 f is fixed (adhered) to the inner surface of the top plate portion 153 of the cover 152 so as to be close to the floor panel 101 of the vehicle 100. Further, the housing 15 includes a front metal piece 14f and a peripheral portion 111y (the power receiving coil 11) of the core member 110 in order to suppress heat interference due to copper loss and iron loss of the power receiving coil 11 with respect to the front metal piece 14f. A partition wall 157 is provided so as to be positioned between the two.

  As shown in FIG. 4, the rear metal piece 14r is disposed between the central portion in the vehicle width direction of the casing 15 and the side wall portion 154y on the rear portion side of the vehicle 100 and the peripheral portion 111y of the core member 110 facing it. And located on the rear side of the vehicle 100 with respect to the power receiving coil. In the present embodiment, the rear metal piece 14r is also fixed (attached) to the inner surface of the top plate portion 153 of the cover 152 so as to be close to the floor panel 101 of the vehicle 100. Further, the housing 15 is positioned between the rear metal piece 14r and the peripheral portion 111y (the power receiving coil 11) of the core member 110 in order to suppress heat interference due to copper loss and iron loss of the power receiving coil 11. Thus, a partition wall 157 is provided. The partition wall 157 may extend from the cover 152 as illustrated in FIG. 2 or may extend from the base member 151.

  Also, a front temperature sensor 16f and a rear temperature sensor 16r are installed in the housing 15. The front temperature sensor 16f detects the temperature of the front metal piece 14f, and the rear temperature sensor 16r detects the temperature of the rear metal piece 14r. The front temperature sensor 16 f and the rear temperature sensor 16 r are each connected to the charge control device 105 via the wire harness 19, and both detected values are given to the charge control device 105. When the casing 15 is molded with respect to the power receiving coil 11, the capacitor 12, etc., the front metal piece 14f and the rear metal piece 14r, the front temperature sensor 16f and the rear temperature sensor 16r It may be embedded inside. In this case, the partition wall 157 may be omitted if the resin is filled between the front metal piece 14f and the power receiving coil 11 and between the rear metal piece 14r and the power receiving coil 11.

  Furthermore, the power receiving apparatus 10 includes a shield member 17 attached to the vehicle 100 together with the housing 15 as shown in FIGS. 2 and 3. The shield member 17 is fixed to the floor panel 101 of the vehicle 100 via a bolt (not shown) together with the mounting flange portion 155 of the housing 15. As shown in FIG. 3, shield member 17 is located in the vertical direction of vehicle 100 between casing 15 and exhaust panel 102 through which exhaust gas from floor panel 101 and engine EG circulates. Accordingly, the shield member 17 is disposed on the opposite side of the power receiving coil 11 with respect to the core member 110.

  In the present embodiment, the shield member 17 is formed of a metal such as an aluminum alloy capable of interrupting AC magnetic flux so as to extend along the bottom of the vehicle 100, that is, along the floor panel 101 and not interfere (contact) with the exhaust pipe 102. Is done. Further, the length of the shield member 17 in the front-rear direction of the vehicle 100, that is, the length of the pair of peripheral edge portions 17x in the front-rear direction is larger than the length of the pair of side wall portions 154x of the housing 15 (cover 152) in the front-rear direction. It has been defined for a long time. Further, the length of the shield member 17 in the vehicle width direction of the vehicle 100, that is, the length of the pair of peripheral edge portions 17 y in the vehicle width direction is larger than the length of the pair of side wall portions 154 y of the housing 15 in the vehicle width direction. It has been defined for a long time. In addition, a pair of protective members 18 are fixed to the floor panel 101 as shown in FIG. Each protection member 18 extends in the front-rear direction of vehicle 100 so as to cover each side wall 154x of housing 15 from the side. The power receiving device 10, that is, the power receiving coil 11 and the capacitor 12 in the housing 15 are connected to the battery 200 via a wire harness 19, a filter (not shown), a rectifier, a relay, and the like.

  FIG. 5 is a partial cross-sectional view showing the power transmission device 20 constituting the power feeding system 1. As shown in the figure, the power transmission device 20 includes a power transmission coil 21, a core member 210, a capacitor 22 connected in series with the power transmission coil 21 to form a resonance circuit together with the power transmission coil 21, AC power with a predetermined frequency (high frequency) A plurality of power devices 23 for supplying power to the power transmission coil, a communication antenna 24, a power transmission control device (electronic control device) 25, a housing 30 for housing them, and the like.

The power transmission coil 21 is a flat spiral coil formed by winding a winding around a resin bobbin (not shown), for example, in a rectangular shape on the same plane, and an air core portion surrounded by the winding 21c. As shown in FIG. 6, the length y ₂₁ of the power transmission coil 21 in the vehicle width direction of the vehicle 100 is determined to be longer than the length x _{21 of the} power transmission coil 21 in the front-rear direction of the vehicle 100. Furthermore, in the present embodiment, the length of the short side and the long side of the power transmission coil 21 is determined to be longer than the length of one side of the power receiving coil 11. However, the power transmission coil 21 may be formed by winding a winding in a circular shape or a square shape on the same plane. If the winding is relatively low, the winding is spiral. It may be a spiral coil formed by being wound around.

In this embodiment, the core member 210 is composed of a plurality of members formed of a ferromagnetic material such as ferrite. As shown in FIG. 5, the core member 210 protrudes to one side (upper side in FIG. 5) from a flange-like flat plate portion 211 having, for example, a rectangular planar shape (contour), and a substantially central portion of the flat plate portion 211. And a hollow protrusion 212. As described above, the length y ₂₁ of the power transmission coil 21 in the vehicle width direction of the vehicle 100 is longer than the length x ₂₁ of the vehicle 100 in the front-rear direction. Therefore, the length of the pair of peripheral edge portions 211y extending in the vehicle width direction of the flat plate portion 211 (core member 210) is a pair of flat plate portions 211 (core member 210) extending in the front-rear direction as shown in FIG. It is determined to be longer than the length of the peripheral portion 211x.

  In the present embodiment, the projecting portion 212 of the core member 210 is formed in a covered cylindrical shape, for example, a short (low-profile) and rectangular tubular wall portion 213 and a flat top plate that closes the tip of the wall portion 213. Part 214. Further, the flat plate portion 211 of the core member 210 extends from the base end portion of the protruding portion 212 (wall portion 213) perpendicularly to the wall portion 213 and outward (radially outward). Furthermore, the power receiving coil 11 is fixed to the flat plate portion 211 of the core member 110 so as to surround the protruding portion 212. That is, the core member 210 is fixed to the power transmission coil 21 so that the flat plate portion 211 and the top plate portion 214 are orthogonal to (intersect) the winding axis of the winding. Moreover, the protrusion part 212 of the core member 210 is inserted in the air core part 21c of the power transmission coil 21, and the winding of the power transmission coil 21 extends along the outer peripheral surface of the protrusion part 212 (wall part 213).

  The power equipment 23 includes a rectifier that converts power from an AC power source 40 as an external power source such as a household power source into DC power, an inverter that converts power from the rectifier into AC power (high frequency power), and a filter that removes high frequency noise. Etc. In this embodiment, the communication antenna 24 is configured as a coil antenna that enables wireless communication based on, for example, the WI-FI standard with the communication antenna 104 of the power receiving apparatus 10, and is electrically connected to the power transmission control apparatus 25. . The power transmission control device 25 is configured as a microcomputer including a CPU (not shown), and controls a rectifier, an inverter, and the like while exchanging information with the charging control device 105 of the power receiving device 10 via the communication antenna 24.

  Further, as illustrated in FIG. 5, the housing 30 of the power transmission device 20 includes a base member 31 and a cover 32. The base member 31 is formed, for example, by casting a metal such as an aluminum alloy, and has a rectangular planar shape (contour). The cover 32 is formed of a resin (nonmagnetic material), and includes a top plate portion having a rectangular planar shape (contour) and a side wall portion extending along the peripheral edge portion of the top plate portion. The cover 32 is fixed to the base member 31 with a plurality of bolts or the like (not shown). For example, an unillustrated seal member (not shown) is disposed between the base member 31 and the end surface of the side wall of the cover 32. As a result, the housing 30 defines an accommodation space for the power transmission coil 21, the core member 210, the power device 23, the communication antenna 24, the power transmission control device 25, and the like by the base member 31 and the cover 32. And in the accommodation space of the housing | casing 30, the shield member 33 supported by the base member 31 with the power transmission coil 21, the core member 210, etc. is arrange | positioned.

  The shield member 33 is formed by casting a metal (nonmagnetic conductive material) such as an aluminum alloy that can block the AC magnetic flux. As shown in FIG. 5, the shield member 33 includes, for example, a flange-shaped core support portion 331 having a rectangular planar shape (outline), and one side (upper side in FIG. 5) from the substantially central portion of the core support portion 331. It has a hollow projecting support portion 332 that projects, and a support wall portion 335 that extends from the peripheral edge portion of the core support portion 331 to the side opposite to the projecting direction of the projecting support portion 332 (the lower side in FIG. 5).

  In the present embodiment, the projecting support portion 332 of the shield member 33 is formed in a covered cylindrical shape that can be fitted into the projecting portion 212 of the core member 210, for example, a square tubular and short (low profile) wall portion 333. And a flat plate-shaped top plate portion 334 that closes the tip of the wall portion 333. The core support portion 331 of the shield member 33 is formed in a flat plate shape, and extends from the base end portion of the protruding support portion 332 (wall portion 333) to the wall portion 333 and outward (radially outward). To do.

  Prior to assembly to the base member 31, the core member 210 and the capacitor 22 that hold the power transmission coil 21 are fixed to the shield member 33 in advance. That is, the power transmission coil 21, the core member 210, the capacitor 22, and the shield member 33 are assembled as a single assembly prior to assembly to the base member 31. As shown in FIG. 5, the core member 210 is fixed to the shield member 33 so that the back surface of the flat plate portion 211 faces the front surface of the core support portion 331, and the protrusion 212 supports the protrusion of the shield member 33. A portion 332 is disposed. In the present embodiment, the back surface of the core member 210 (the lower surface in FIG. 5) is covered with an insulating member 215 such as a resin, and between the core member 210 and the shield member 33, as shown in FIG. The insulating member 215 is interposed.

  Accordingly, the flat plate portion 211 of the core member 210 is supported by the core support portion 331 of the shield member 33, and the protruding portion 212 of the core member 210 is supported by the protruding support portion 332 of the shield member 33. Further, as can be seen from FIG. 5, the air core portion 21 c of the power transmission coil 21 is blocked (covered) from the lower side in the figure by the shield member 33. Further, as shown in FIG. 5, the capacitor 22 is disposed in the protruding support portion 332 of the shield member 33, and is fixed to the back surface (the lower surface in FIG. 5) of the top plate portion 334, and further connected to the power transmission coil 21. Connected. In addition, by interposing the insulating member 215 between the core member 210 and the shield member 33, the magnetic flux flowing through the core member 210 is prevented from flowing into the shield member 33, thereby suppressing the occurrence of eddy current loss. Can do.

  The shield member 33 integrated with the power transmission coil 21 and the core member 210 is fixed to the base member 31 so that the end surface of the support wall portion 335 contacts the surface of the base member 31. Is on the opposite side. In addition, the plurality of power devices 23, the power transmission control device 25, and the like are fixed to predetermined positions of the base member 31 via bolts or the like (not shown) and covered with the shield member 33. Furthermore, each electric power device 23 arranged between the base member 31 and the shield member 33 is electrically connected to corresponding elements such as the power transmission coil 21 and the capacitor 22 via a cable (wire harness).

  After the power transmission coil 21, the core member 210, the shield member 33, the power device 23, and the like are assembled to the base member 31, the cover 32 is fixed to the base member 31. The communication antenna 24 is housed in the housing 30 so as not to be covered by the shield member 33, and is electrically connected to the power transmission control device 25 via a cable (not shown). As a result, electromagnetic waves from the communication antenna 24 are not blocked by the resin cover 32, so that information can be exchanged between the power transmission control device 25 and the charging control device 105 on the power receiving device 10 side via the communication antenna 24. (Wireless communication) is possible.

  In the power transmission device 20, the longitudinal direction of the casing 30, the power transmission coil 21, and the core member 210 extends in parallel with the vehicle width direction of the vehicle 100 in the stop space, and the winding axis of the power transmission coil 21 is the vertical direction, The vehicle 100 is installed in the stop space so as to extend in the vertical direction. The power transmission coil 21 in the housing 30 is located above the flat plate portion 211 of the core member 210, that is, on the vehicle 100 side.

  When power is supplied to the vehicle 100 by the power feeding system 1 including the power receiving device 10 and the power transmitting device 20 as described above, the power is received with the power receiving coil 11 of the power receiving device 10 and the power transmitting coil 21 of the power transmitting device 20 facing each other. Electric power is supplied from the device 23 to the power transmission coil. As a result, the magnetic flux from the power transmission device 20 flows in the vertical direction of the vehicle 100 through the resin cover 32 of the housing 30 to the power reception coil 11 of the power reception device 10 and is not contacted by electromagnetic induction (magnetic resonance). Power is supplied. As a result, power can be supplied from the power receiving apparatus 10 to the battery 200 via a rectifier or the like, and the battery 200 can be charged with the power.

  Further, in the power transmission device 20 of the power feeding system 1, the power device 23 is disposed between the shield member 33 and the base member 31. Therefore, the shield member 33 (and the base member 31) blocks the magnetic flux that is about to flow into the electric power device 23 and promotes the inflow of the magnetic flux (the magnetic flux from the power receiving coil 11) to the core member 210 (flat plate portion 211). It is possible to satisfactorily suppress the temperature rise of the electric power device 23 due to the flow of the eddy current due to the magnetic flux. In addition, by disposing the power device 23 between the shield member 33 and the base member 31, it is possible to satisfactorily suppress noise (high-frequency noise) generated in the power device 23 from leaking to the outside of the housing 30. Is also possible. In addition, in the power transmission device 20 of the power feeding system 1, the shield member 33 is arranged so as to block (cover) the air core portion 21 c of the power transmission coil 21 from below, so that it will pass through the air core portion 21 c of the power transmission coil 21. Can be interrupted by the shield member 33.

  Further, in the power receiving device 10 of the power feeding system 1, since the shield member 17 is arranged so as to cover the air core portion 11 c of the power receiving coil 11 from above, the magnetic flux that has passed through the air core portion 11 c of the power receiving coil 11 is shielded. It can be blocked by 17. As a result, the eddy current due to the magnetic flux that has passed through the air core portion 11c of the power receiving coil 11 flows, so that the floor panel 101 and the exhaust pipe 102 disposed around the power receiving coil 11 are heated or the floor panel 101 is heated. Thus, for example, it is possible to satisfactorily suppress the temperature rise of resin members (not shown) such as various floor covers and wire harness clamps.

  However, the stop position of the vehicle 100 with respect to the power transmission device 20 in the stop space (a position where the power reception device 10 faces) is not basically constant. Accordingly, power may be supplied from the power transmission device 20 to the power reception device 10 in a state where the position of the power reception coil 11 (power reception device 10) with respect to the power transmission coil 21 (power transmission device 20) is deviated from the normal position planned. . In addition, since the magnetic flux from the power transmission device 20 flows in the vertical direction of the vehicle 100 as described above, power is transmitted to the floor panel 101 of the vehicle 100 and the like due to the positional deviation between the power reception device 10 and the power transmission device 20. Magnetic flux from the device 20 flows in. And the part etc. which are not covered with the shield member 17 of the floor panel 101 may become high temperature by the eddy current by the magnetic flux from the power transmission apparatus 20 flowing in this way. Moreover, there is a possibility that the resin member such as a floor cover or a wire harness clamp may be heated by heat of the floor panel 101 or the like.

  Furthermore, any of the plurality of metal pieces 14f and 14r arranged in the casing 15 of the power receiving device 10 is also subject to eddy current due to magnetic flux from the power transmitting device 20 due to the positional deviation between the power receiving device 10 and the power transmitting device 20. The temperature rises by flowing. That is, there is a correlation between the temperature Tf of the front metal piece 14f and the temperature of the floor panel 101 and the like around the front metal piece 14f (hereinafter referred to as “vehicle-side temperature” as appropriate), and the front metal piece 14f. As shown in FIG. 7, the vehicle-side temperature in the vicinity of is changed approximately in proportion to the temperature Tf of the front metal piece 14f. Similarly, there is a correlation between the temperature Tr of the rear metal piece 14r and the vehicle side temperature around the rear metal piece 14r, and the vehicle side temperature around the rear metal piece 14r is also shown in FIG. As shown in FIG. 4, the temperature changes substantially in proportion to the temperature Tr of the rear metal piece 14r.

  In other words, when the temperature of the metal piece 14f or 14r rises, the position of the power receiving device 10 with respect to the power transmission device 20 is shifted from the planned normal position to the side where the metal piece 14f or 14r is provided. become. Then, it can be assumed that the floor panel 101 or the like may be heated due to the positional deviation between the power receiving device 10 and the power transmitting device 20. Therefore, in the power feeding system 1, when power is supplied from the power transmitting device 20 to the power receiving device 10 in a non-contact manner, the power transmitting device according to the temperatures Tf and Tr of the metal pieces 14f and 14r detected by the temperature sensors 16f and 16r. By adjusting the electric power transmitted from 20, it is possible to satisfactorily suppress the high temperature of resin members such as the floor panel 101 and the floor cover.

  Here, the positional deviation between the power reception device 10 and the power transmission device 20 is generally larger in the vehicle width direction than in the front-rear direction of the vehicle 100. Furthermore, when the power receiving device 10 and the power transmitting device 20 are normally aligned in the front-rear direction of the vehicle 100, the portions of the winding of the power transmitting coil 21 that are located on the front side and the rear side of the winding are the windings of the power receiving coil 11. It is magnetically coupled to a portion located on the front or rear side of the vehicle. For this reason, in this embodiment, the length (dimension) of the power transmission coil 21 in the vehicle width direction of the vehicle 100 is determined to be longer (larger) than the length (dimension) of the power transmission coil 21 in the front-rear direction of the vehicle 100. Thereby, even if the position of the power receiving device 10 with respect to the power transmitting device 20 is shifted in the vehicle width direction, the portion of the winding of the power transmission coil 21 located on the front side and the rear side of the vehicle 100 and the vehicle of the winding of the power receiving coil 11 It is possible to satisfactorily ensure a magnetically coupled state (the overlapping length of the power receiving coil 11 and the power transmitting coil 21 in the vehicle width direction when viewed in plan) with a portion located on the front side or the rear side of 100.

  In this way, when the portions located on the vehicle front side and the rear side of the winding of the power transmission coil 21 and the portions located on the vehicle front side or the rear side of the winding of the power receiving coil 11 are mainly combined, the power transmission device 20 When the position of the power receiving device 10 with respect to the vehicle 100 is shifted in the front-rear direction of the vehicle 100, a large amount of magnetic flux flows from the power transmission coil 21 into the floor panel 101 or the like located on the front side or rear side of the vehicle with respect to the power receiving coil 11. Based on this, the housing 15 of the power receiving apparatus 10 is provided with the front metal piece 14f and the rear metal piece 14r as described above. That is, when the position of the power receiving device 10 with respect to the power transmitting device 20 is shifted in the front-rear direction of the vehicle 100, a large amount of magnetic flux flows into one of the front metal piece 14f and the rear metal piece 14r. Therefore, by adjusting the electric power transmitted from the power transmission device 20 in accordance with the temperatures Tf and Tr of the front and rear metal pieces 14f and 14r, the temperature increase of the structural members such as the floor panel 101 of the vehicle 100 is extremely well suppressed. It becomes possible to do.

  FIG. 8 is a flowchart illustrating an example of a charging control routine executed by the charging control device 105 of the power receiving device 10. The charging control device 105 stops the vehicle 100 in the stop space where the power transmission device 20 is installed, and after transmitting a power transmission start command to the power transmission device 20 according to a power transmission permission signal from the power transmission device 20 side, for example, FIG. The charging control routine is started, and the routine is repeatedly executed every predetermined time.

  At the start of the charging control routine, the charging control device 105 (CPU) determines the SOC (charging ratio) of the battery 200 of the vehicle 100, the temperature Tf of the front metal piece 14f from the front temperature sensor 16f, and the temperature from the rear temperature sensor 16r. Data necessary for control such as the temperature Tr of the rear metal piece 14r is input (step S100). Note that the SOC of the battery 200 is separately calculated based on the inter-terminal voltage, the charge / discharge current, and the like of the battery 200 by an electronic control unit that performs overall control of the vehicle 100 including, for example, travel control.

  Next, the charging control device 105 determines whether or not charging of the battery 200 is completed based on the SOC input in step S100 (step S110). When it is determined in step S110 that the SOC has not reached the predetermined target value and the charging of the battery 200 is not completed, the charging control device 105 determines the temperature of the front metal piece 14f input in step S100. The higher of Tf and the temperature Tr of the rear metal piece 14r is set to the metal piece temperature T (step S120). Further, the charging control device 105 determines whether or not the flag F has a value of 0 (step S130). If the flag F has a value of 0, the metal piece temperature T set in step S120 is determined in advance. It is determined whether it is below the power transmission stop temperature Tstop as the threshold value (step S140).

  The power transmission stop temperature Tstop is the lowest heat resistance temperature among the heat resistance temperatures of resin members such as the floor panel 101 arranged around the power receiving coil 11 of the power receiving apparatus 10 and the clamps of the floor cover and the wire harness, and the temperatures Tf and Tr. Is determined in advance based on the correlation between the vehicle temperature and the vehicle-side temperature, and is stored in a ROM (not shown) of the charging control device 105. In the present embodiment, the power transmission stop temperature Tstop is set to a value lower than the temperature obtained by converting the lowest heat-resistant temperature into the temperature of the metal pieces 14f and 14r.

  When it is determined that the metal piece temperature T is equal to or lower than the power transmission stop temperature Tstop, the charging control device 105 requests power transmission that is a required value of the transmitted power to the power transmission device 20 based on the SOC of the battery 200 and the metal piece temperature T. Electric power Preq is set (step S150). In the present embodiment, a requested transmission power setting map (not shown) that defines the relationship between the SOC and the metal piece temperature T and the requested transmission power Preq is created in advance and stored in a ROM (not shown) of the charging control device 105.

  The required transmission power setting map is created so that, for example, the required transmission power Preq is set to a first value (a constant value) until the SOC becomes a predetermined value slightly smaller than the target value. Further, the required transmission power setting map is created such that when the SOC exceeds the predetermined value, the required transmission power Preq is set to a second value (a constant value) smaller than the first value. Furthermore, when the metal piece temperature T exceeds the predetermined temperature, the required transmission power setting map is created so that the required transmission power Preq is reduced as the metal piece temperature T is higher.

  When setting the required transmission power Preq set in step S150, the charging control device 105 transmits the set required transmission power Preq to the power transmission control device 25 of the power transmission device 20 (step S160), and performs the processing after step S100 again. Run. The power transmission control device 25 that has received the required transmission power Preq from the power receiving device 10 side controls the power device 23 such that the high-frequency power corresponding to the required transmission power Preq is supplied to the power transmission coil 21. Thereby, electric power is supplied from the power transmission coil 21 of the power transmission device 20 to the power reception coil 11 of the power reception device 10 in a non-contact manner.

  On the other hand, after performing the processing of steps S100 to S130, when it is determined that the metal piece temperature T set in step S120 exceeds a predetermined power transmission stop temperature Tstop (step S140), the charging control device 105 displays a flag. After F is set to 1 (step S170), a power transmission stop command is transmitted to the power transmission control device 25 of the power transmission device 20 (step S180). After transmitting the power transmission stop command to the power transmission control device 25, the charging control device 105 executes the processes after step S100 again. The power transmission control device 25 that has received the power transmission stop command from the power receiving device 10 side stops the power supply from the power device 23 to the power transmission coil 21.

  If the flag F is set to the value 1 in step S170 because the metal piece temperature T exceeds the power transmission stop temperature Tstop, the charging control apparatus 105 determines that the flag F is the value 1 in the next step S130. It is determined and it is determined whether or not the metal piece temperature T set in step S120 is equal to or lower than a predetermined power transmission restart temperature Trst (step S190). The power transmission restart temperature Trst is set to a value sufficiently lower than the power transmission stop temperature Tstop in consideration of the temperature change characteristics of components such as the floor panel 101 arranged around the power receiving coil 11. If the charge control device 105 determines that the metal piece temperature T exceeds the power transmission restart temperature Trst, the charge control device 105 executes the processing after step S100 again without restarting the power transmission from the power transmission device 20.

  On the other hand, when it is determined that the metal piece temperature T is equal to or lower than the power transmission restart temperature Trst, the charging control device 105 considers that the members around the power receiving coil 11 have sufficiently cooled down and sets the flag F to the value 0. At the same time, a power transmission restart command is transmitted to the power transmission control device 25 of the power transmission device 20 (step S200). Further, the charging control device 105 sets the required transmission power Preq in step S150, transmits the set required transmission power Preq to the power transmission control device 25 (step S160), and executes the processing from step S100 onward again. The power transmission control device 25 that has received the power transmission resumption command and the required transmission power Preq from the power reception device 10 side restarts the power transmission to the power reception device 10, and the high frequency power corresponding to the required transmission power Preq is supplied to the power transmission coil 21. Thus, the power device 23 is controlled.

  As described above, the charging control device 105 detects the metal piece temperature T, that is, the temperature Tf detected by the front-side and rear-side temperature sensors 16f and 16r when the power is supplied from the power transmission device 20 to the power reception device 10. When Tr exceeds the power transmission stop temperature Tstop, a power transmission stop command is output to the power transmission device 20 (steps S140, S170, S180). Thereby, the temperature of the structural member of the vehicle 100 such as the heated floor panel 101 can be lowered.

  In addition, the charging control device 105 outputs to the power transmission device 20 the required transmission power Preq corresponding to the metal piece temperature T, that is, the temperature Tf or Tr detected by the front and rear temperature sensors 16f and 16r. The required transmission power Preq is set so as to decrease as the temperature T, that is, the temperature Tf or Tr increases (steps S150 and S160). Accordingly, it is possible to prevent power transmission from the power transmission device 20 from being stopped as much as possible while suppressing a high temperature of the structural member such as the floor panel 101.

  When charging control device 105 determines in step S110 that the SOC has reached the target value and charging of battery 200 is complete, it transmits a power transmission stop command to power transmission control device 25 of power transmission device 20 (step S210). This routine is terminated.

  As described above, the power receiving device 10 of the power feeding system 1 accommodates the power receiving coil 11 formed by winding a winding and the power receiving coil 11, and the winding axis of the power receiving coil 11 is the vehicle 100. The housing 15 is attached to the floor panel 101 of the vehicle 100 so as to extend in the vertical direction, and the charging control device 105 is included. The front and rear metal pieces 14f and 14r are attached to the casing 15 so as to be positioned around the power receiving coil 11, and the front side for detecting the temperatures Tf and Tr of the front and rear metal pieces 14f and 14r. Also, rear temperature sensors 16f and 16r are provided. Further, the charging control device 105 adjusts the power transmitted from the power transmission device 20 according to the temperatures Tf and Tr of the front and rear metal pieces 14f and 14r detected by the front and rear temperature sensors 16f and 16r. Thus, a command signal is output to the power transmission device 20 (steps S160, S180, and S200 in FIG. 8).

  In this way, when power is supplied from the power transmission device 20 to the power reception device 10 in a non-contact manner, by adjusting the power transmitted from the power transmission device 20 according to the temperatures Tf and Tr of the metal pieces 14f and 14r, It is possible to satisfactorily suppress the high temperature of components such as the floor panel 101 of the vehicle 100. Further, by providing the casing 15 with the metal pieces 14f and 14r and the temperature sensors 16f and 16r, it is not necessary to provide a plurality of temperature sensors in the exposed environment such as the floor panel 101 of the vehicle 100.

  The charging control device 105 of the power receiving device 10 decreases the required transmission power Preq to the power transmission device 20 in step S150 as the temperatures Tf and Tr detected by the front and rear temperature sensors 16f and 16r are higher. Set, but not limited to this. That is, in step S150 of FIG. 8, the required transmission power Preq may be set according to only the SOC of battery 200.

  In addition, as shown by a two-dot chain line in FIG. 4, the housing 15 of the power receiving device 10 has a left metal piece (one side metal) positioned on the left side (one side) in the vehicle width direction of the vehicle 100 with respect to the power receiving coil 11. Piece) 14L, a left side temperature sensor 16L that detects the temperature of the left side metal piece 14L, and a right side metal piece (others) attached to the housing 15 so as to be located on the right side (other side) in the vehicle width direction than the power receiving coil 11 Side metal piece) 14R and a right temperature sensor 16R for detecting the temperature of the right metal piece 14R may be provided. In this case, the left and right metal pieces 14L and 14R are arranged at the center and the left or right side wall 154x in the front-rear direction of the casing 15 and the peripheral edge of the core member 110 facing it as shown by the two-dot chain line in FIG. It is good to arrange | position between the parts 111x. Thereby, even if the stop position of the vehicle 100 with respect to the power transmission device 20 is shifted in both the front-rear direction and the vehicle width direction of the vehicle 100, the temperature of the plurality of metal pieces 14f, 14r, 14L, 14R of the housing 15 is determined. Thus, it is possible to suppress the temperature increase of the structural members of the vehicle 100 such as the floor panel 101 very well. Furthermore, when the dimension of the power transmission coil 21 in the front-rear direction of the vehicle 100 is determined to be larger than the dimension of the power transmission coil 21 in the vehicle width direction of the vehicle 100, the left metal piece (one side metal piece) on the casing 15 of the power receiving device 10. Only 14L and the right metal piece (other metal piece) 14R may be provided. A plurality of front and rear metal pieces 14f and 14r may be provided, and a plurality of left and right metal pieces 14L and 14R may be provided.

  In addition, the power transmission device 20 may be provided with a radiator having a plurality of radiating fins so as to come into contact with, for example, the casing 30, or a plurality of radiating fins may be provided on the casing 30 or the cover 32. Good. Thereby, it is possible to satisfactorily cool the power equipment 23 such as a rectifier, an inverter, and a filter that generate heat during power transmission from the power transmission device 20 to the power reception device 10.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment at all, and it cannot be overemphasized that various changes can be made within the range of the extension of this invention. Furthermore, the mode for carrying out the invention described above is merely a specific embodiment of the invention described in the column for solving the problem, and is described in the column for means for solving the problem. It is not intended to limit the elements of the invention.

  The present invention can be used in the manufacturing industry of coil units and non-contact power supply systems.

  DESCRIPTION OF SYMBOLS 1 Power feeding system, 10 Power receiving apparatus, 11 Power receiving coil, 11c Air core part, 12 Capacitor, 14L Left side metal piece, 14R Right side metal piece, 14f Front side metal piece, 14r Rear side metal piece, 15 Housing, 16L Left side temperature sensor, 16R Right side temperature sensor, 16f Front side temperature sensor, 16r Rear side temperature sensor, 17 Shield member, 17x, 17y Peripheral part, 18 Protection member, 19 Wire harness, 20 Power transmission device, 21 Power transmission coil, 21c Air core part, 22 Capacitor, 23 power equipment, 24 communication antenna, 25 power transmission control device, 30 housing, 31 base member, 32 cover, 33 shield member, 40 AC power supply, 100 vehicle, 101 floor panel, 102 exhaust pipe, 104 communication antenna, 105 charge control Device, 110 core member, 111 flat plate part 111x, 111y Perimeter, 112 Projection, 113 Wall, 114 Top plate, 151 Base member, 152 Cover, 153 Top plate, 154x, 154y Side wall, 155 Mounting flange, 157 Bulkhead, 200 Battery, 210 Core Member, 211 flat plate portion, 211x, 211y side edge portion, 212 protrusion portion, 213 wall portion, 214 top plate portion, 215 insulating member, 331 core support portion, 332 protrusion support portion, 333 wall portion, 334 top plate portion, 335 Support wall, EG engine, MG electric motor.

Claims (4)

In the power supply system including a power transmitting device which is disposed below the vehicle, and a power receiving device that receives power from the power transmitting device while being mounted on the vehicle in a non-contact,
The power receiving device is:
A power receiving coil formed by winding a winding;
A housing that accommodates the power receiving coil and is attached to a floor panel of the vehicle such that a winding axis of the power receiving coil extends in a vertical direction of the vehicle;
At least one metal piece attached to the housing so as to be located around the power receiving coil;
A temperature sensor for detecting the temperature of the metal piece;
A control device that outputs a command signal to the power transmission device so that the power transmitted from the power transmission device is adjusted according to the temperature detected by the temperature sensor;
Equipped with a,
The control device stores a correlation between the temperature of the metal piece and a required value of transmitted power to the power transmission device, and the required value corresponding to the temperature detected by the temperature sensor for the power transmission device. Output
The required value, power supply system, characterized in Rukoto is set smaller the higher the temperature detected by the temperature sensor. The power feeding system according to claim 1,
The power transmission device has a power transmission coil formed by winding a winding, and is installed in a stop space of the vehicle so that a winding axis of the power transmission coil extends in the vertical direction of the vehicle,
The dimension of the power transmission coil in the vehicle width direction of the vehicle is larger than the dimension of the power transmission coil in the front-rear direction of the vehicle,
The metal piece is attached to the housing so as to be positioned on the front side of the vehicle relative to the power receiving coil, and the housing is positioned on the rear side of the vehicle relative to the power receiving coil. And a rear metal piece attached to the power supply system . The power feeding system according to claim 1 or 2,
The metal piece is positioned on one side in the vehicle width direction of the vehicle with respect to the power receiving coil, and is positioned on the other side in the vehicle width direction with respect to the power receiving coil. power supply system, characterized in that it comprises an other-side metal piece attached to the housing so as to. In the electric power feeding system as described in any one of Claim 1 to 3,
The control device outputs a power transmission stop command to the power transmission device when a temperature detected by the temperature sensor exceeds a predetermined threshold when power is supplied from the power transmission device to the power reception device. A power supply system characterized by that.

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