JP7152947B2 - charging system - Google Patents

Description

The present invention relates to a charging system for charging a vehicle battery.

In an electric vehicle, a charging connector (charging gun) is connected from the outside of the vehicle, and the onboard battery is charged through the charging connector.

Patent Literature 1 discloses a technology in which a power transmission coil is provided in a charging connector, the power transmission coil is arranged to face a power reception coil provided in a vehicle, and power is supplied to the vehicle by electromagnetic induction. Further, Patent Literature 1 discloses a technique in which magnets are provided around a power receiving coil and around a power transmitting coil, and a charging connector is fixed to a vehicle by attraction between the magnets.

JP-A-10-112354

In Patent Document 1, when the charging connector is brought close to a magnet on the vehicle side, the charging connector is attracted by the attractive force of the magnet and is immediately fixed to the vehicle. For this reason, in Patent Document 1, the charging connector may be fixed to the vehicle in a state in which the position of the power transmitting coil is not sufficiently aligned with the power receiving coil.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a charging system capable of suppressing displacement of a charging connector when it is fixed.

In order to solve the above problems, the charging system of the present invention includes a power transmission coil that transmits power to a vehicle in a power transmission device, a first electromagnetic coil that is provided in the power transmission device and functions as a magnet when energized, and a first electromagnetic coil. and a first magnetic sensor for measuring magnetic flux density, and a first controller for controlling energization of the first electromagnetic coil. A current of one current value is passed through the first electromagnetic coil, and based on the magnetic flux density measured by the first magnetic sensor, the power receiving coil receives power from the power transmitting coil in a non-contact manner at the power receiving device mounted on the power transmitting coil and the vehicle. When the first wrap rate is greater than or equal to the predetermined wrap rate, a second current value larger than the first current value is passed through the first electromagnetic coil.

Further, a second electromagnetic coil provided in the power receiving device and functioning as a magnet when energized, a second magnetic sensor provided at or near an end surface of the second electromagnetic coil for measuring magnetic flux density, and a magnetic flux density to the second electromagnetic coil. and a second control unit that controls energization, the second control unit supplies a current of a first current value to the second electromagnetic coil, and transmits power based on the magnetic flux density measured by the second magnetic sensor. A second wrap rate between the coil and the receiving coil is derived, and the first control unit outputs a current having a second current value when both the first wrap rate and the second wrap rate are equal to or higher than a predetermined wrap rate. When both the first wrap rate and the second wrap rate are greater than or equal to the predetermined wrap rate, the second controller supplies the current of the second current value to the second electromagnetic coil. good too.

Further, the second control unit may apply a current of the first current value to the second electromagnetic coil when the magnetic flux density in at least part of the measurable range of the second magnetic sensor is equal to or higher than a predetermined magnetic flux density. .

Further, in the range where the first magnetic sensor and the second magnetic sensor overlap, one or both of the magnetic flux density measured by the first magnetic sensor and the magnetic flux density measured by the second magnetic sensor is less than or equal to a predetermined magnetic flux density. If there is a portion that is equal to or greater than the predetermined range, the first control unit and the second control unit do not have to switch the current values of the first electromagnetic coil and the second electromagnetic coil to the second current value.

In order to solve the above problems, the charging system of the present invention includes: a power receiving coil that receives power in a contactless manner in a power receiving device mounted on a vehicle; a second electromagnetic coil that is provided in the power receiving device and functions as a magnet when energized; A second magnetic sensor provided at or near the end face of the second electromagnetic coil and measuring the magnetic flux density, and a second control unit for controlling energization of the second electromagnetic coil, the second control unit , a current having a predetermined first current value is passed through the second electromagnetic coil, and a second wrap between the power transmitting coil and the power receiving coil for transmitting power to the vehicle in the power transmitting device based on the magnetic flux density measured by the second magnetic sensor. When the second wrap rate is greater than or equal to the predetermined wrap rate, a second current value larger than the first current value is passed through the second electromagnetic coil.

In order to solve the above problems, the charging system of the present invention includes a power transmission coil that transmits power to a vehicle in a power transmission device, a first electromagnetic coil that is provided in the power transmission device and functions as a magnet when energized, and a first electromagnetic coil. A first magnetic sensor that is provided at or near the end face of the magnetic flux density to measure the magnetic flux density, a first control unit that controls the energization of the first electromagnetic coil, and a power receiving device mounted on the vehicle to receive power in a contactless manner a power receiving coil, a second electromagnetic coil that is provided in the power receiving device and functions as a magnet when energized, a second magnetic sensor that is provided at or near an end surface of the second electromagnetic coil and measures magnetic flux density, and the second electromagnetic coil and a second control unit that controls energization to the first control unit, the first control unit supplies a current of a predetermined first current value to the first electromagnetic coil, and the magnetic flux density measured by the first magnetic sensor Based on this, the first wrap rate between the power transmitting coil and the power receiving coil is derived, and when the first wrap rate is equal to or greater than the predetermined wrap rate, the current of the second current value larger than the first current value is supplied to the first electromagnet. The second control unit causes a predetermined first current value to flow through the second electromagnetic coil, and based on the magnetic flux density measured by the second magnetic sensor, a second wrap between the power transmitting coil and the power receiving coil. When the second wrap rate is greater than or equal to the predetermined wrap rate, a second current value larger than the first current value is passed through the second electromagnetic coil.

ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to suppress positional deviation at the time of fixing a charge connector.

1 is a schematic diagram showing the configuration of a charging system according to an embodiment; FIG. It is a top view which shows the structure of a 1st magnetic sensor. It is an explanatory view explaining detection of magnetic flux density by the 1st magnetic sensor. 4 is a flowchart for explaining the operation of the first control unit when charging is started; 7 is a flowchart for explaining the operation of the second control unit when charging is started; 4 is a flowchart for explaining the operation of the first control unit when charging is completed; 9 is a flowchart for explaining the operation of the second control unit when charging is finished;

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in these embodiments are merely examples for facilitating understanding of the invention, and do not limit the invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are given the same reference numerals to omit redundant description, and elements that are not directly related to the present invention are omitted from the drawings. do.

FIG. 1 is a schematic diagram showing the configuration of a charging system 1 of this embodiment. In FIG. 1, the power flow is indicated by solid line arrows, and the control signal flow is indicated by dashed line arrows.

The charging system 1 charges a battery 4 mounted in a vehicle 2 such as an electric vehicle or a hybrid electric vehicle. The battery 4 is a secondary battery such as a lithium ion battery. The charging system 1 includes a charging stand 6 , a charging connector (charging gun) 8 , a power transmitting device 10 and a power receiving device 12 . The charging station 6 is equipment connected to a commercial power source 14 and used to charge the battery 4 of the vehicle 2 . The charging connector 8 is connected to the charging stand 6 with a cable.

The power transmission device 10 is detachable from the charging connector 8, for example. When attached to the charging connector 8 , the power transmitting device 10 functions together with the charging connector 8 . Therefore, in the charging system 1, the existing charging connector 8 and charging stand 6 can be used, and the introduction cost of the charging system 1 can be suppressed. Further, in the charging system 1, even the charging connector 8 does not need to be replaced when the power transmission device 10 fails, and repair costs can be reduced. On the other hand, the power receiving device 12 is mounted on the vehicle 2, and is provided behind one side surface of the vehicle 2, for example.

The power transmission device 10 is arranged to face the power reception device 12 when the battery 4 is charged. The power transmission device 10 transmits power from a commercial power supply 14 supplied through the charging stand 6 to the vehicle 2 . The power receiving device 12 receives power transmitted from the power transmitting device 10 in an electrically non-contact manner. The battery 4 is charged with the received power.

The power transmission device 10 includes a core 20 , a first electromagnetic coil 22 , a power transmission coil 24 , a first magnetic sensor 26 , a protective sheet 28 and a casing 30 .

The core 20 is made of ferrite, for example, and has a substantially cylindrical shape. The core 20 is formed with a cylindrical accommodating portion 32 along the central axis and an annular accommodating portion 34 concentric with the accommodating portion 32 . A waterproof film 36 made of synthetic resin or the like is formed on the surface of the core 20 . Therefore, even if the core 20 gets wet due to rain or the like, electric leakage can be prevented. One side surface of the core 20 in the central axis direction (side surface opposite to the first magnetic sensor 26 ) is fixed to the casing 30 .

The housing portion 32 houses the first electromagnetic coil 22 . The first electromagnetic coil 22 is accommodated so that its central axis direction coincides with the central axis direction of the core 20 . The first electromagnetic coil 22 functions as a magnet when energized. The first electromagnetic coil 22 has, for example, the N pole at the end opposite to the casing 30 (the end on the first magnetic sensor 26 side). Note that FIG. 1 shows the side surface of the first electromagnetic coil 22 .

The housing portion 34 houses the power transmission coil 24 . The power transmission coil 24 is housed so that its central axis direction coincides with the central axis direction of the core 20 . That is, the power transmission coil 24 is wound around the first electromagnetic coil 22 . Note that FIG. 1 shows a cross section of the power transmission coil 24 .

The first magnetic sensor 26 is provided on the end surfaces of the first electromagnetic coil 22 and the power transmission coil 24 opposite to the casing 30 . The first magnetic sensor 26 is formed in a substantially sheet shape and covers end surfaces of the first electromagnetic coil 22 and the power transmission coil 24 . The first magnetic sensor 26 measures magnetic flux density. The first magnetic sensor 26 will be detailed later.

Note that the first magnetic sensor 26 is not limited to being provided on the end surface of the first electromagnetic coil 22 , and may be provided near the end surface of the first electromagnetic coil 22 . For example, the first magnetic sensor 26 may be provided on a side surface near the end face of the first electromagnetic coil 22 or may be provided inside the first electromagnetic coil 22 near the end face.

The protective sheet 28 is provided on the opposite side of the first magnetic sensor 26 to the first electromagnetic coil 22 . The protective sheet 28 is made of a material that is non-conductive and easily conducts magnetism. For example, the protective sheet 28 is made of rubber, synthetic resin, or the like. A protective sheet 28 extends to the end of the core 20 and covers the first magnetic sensor 26 . Therefore, in the charging system 1 , it is possible to prevent the vehicle 2 from being damaged by the power transmission device 10 when the power transmission device 10 is fixed to the vehicle 2 .

Casing 30 is attached to charging connector 8 . Casing 30 accommodates power converter 40 , AC/DC converter 42 , first control section 44 , and first communication section 46 .

The power conversion device 40 is, for example, an inverter, converts the frequency of the power supplied via the charging station 6 into a predetermined frequency, and supplies the power transmission coil 24 with the predetermined frequency. The predetermined frequency is, for example, a frequency (eg, several tens of kHz) higher than the commercial frequency. In the charging system 1, power can be transmitted efficiently by converting the frequency of the power supplied to the power transmission coil 24 to a predetermined frequency.

The AC/DC converter 42 converts AC power supplied via the charging stand 6 into DC power and supplies the DC power to the first electromagnetic coil 22 . When power is supplied to the first electromagnetic coil 22, a magnetic field is generated around the first electromagnetic coil 22, and the first electromagnetic coil 22 functions as a magnet.

The first control unit 44 controls power supply to the power transmission coil 24 via the power conversion device 40 . The first control unit 44 also controls energization of the first electromagnetic coil 22 via the AC/DC converter 42 based on the magnetic flux density measured by the first magnetic sensor 26 .

The first communication unit 46 performs wireless communication (for example, Wi-Fi (registered trademark), etc.) with the power receiving device 12 . The first control unit 44 acquires various types of information from the power receiving device 12 through communication through the first communication unit 46 .

Also, the charging connector 8 is provided with a lever 48 . The lever 48 is operated by the user, for example, after charging is completed.

The power receiving device 12 includes a core 50 , a second electromagnetic coil 52 , a power receiving coil 54 , a second magnetic sensor 56 , an onboard charger 80 , a DC/DC converter 82 , a second control section 84 and a second communication section 86 . be done.

The core 50 is made of ferrite, for example, and has a substantially cylindrical shape. The core 50 is formed with a cylindrical accommodating portion 62 along the central axis and an annular accommodating portion 64 concentric with the accommodating portion 62 . A waterproof film 66 made of synthetic resin or the like is formed on the surface of the core 50 . Therefore, even if the core 50 gets wet due to rain or the like, electric leakage or the like can be prevented.

One side surface of the core 50 in the central axis direction (the side surface of the second magnetic sensor 56 ) is fixed to the inner side surface of the insulating plate 68 . The insulating plate 68 is made of a non-conductive, magnetically permeable material. For example, the insulating plate 68 is made of FRP or the like. The insulating plate 68 is fixed to the body 70 of the vehicle 2 . The body 70 is, for example, a sheet metal of the side surface of the vehicle 2 .

The housing portion 62 houses the second electromagnetic coil 52 . The second electromagnetic coil 52 is housed so that its central axis direction coincides with the central axis direction of the core 50 . The second electromagnetic coil 52 functions as a magnet when energized. The second electromagnetic coil 52 has, for example, the S pole on the side of the insulating plate 68 . Note that FIG. 1 shows the side surface of the second electromagnetic coil 52 .

The receiving coil 54 is housed in the housing portion 64 . The receiving coil 54 is housed so that its central axis direction coincides with the central axis direction of the core 50 . That is, the power receiving coil 54 is wound around the second electromagnetic coil 52 . Note that FIG. 1 shows a cross section of the receiving coil 54 .

The second magnetic sensor 56 is provided on the end surface of the second electromagnetic coil 52 and the receiving coil 54 on the insulating plate 68 side. The second magnetic sensor 56 is formed in a substantially sheet shape and covers end surfaces of the second electromagnetic coil 52 and the power receiving coil 54 . Also, the second magnetic sensor 56 is covered with an insulating plate 68 . A second magnetic sensor 56 measures the magnetic flux density. The second magnetic sensor 56 will be described later.

The second magnetic sensor 56 is not limited to being provided on the end surface of the second electromagnetic coil 52 , and may be provided near the end surface of the second electromagnetic coil 52 . For example, the second magnetic sensor 56 may be provided on the side surface near the end face of the second electromagnetic coil 52, or may be provided inside the second electromagnetic coil 52 near the end face.

Here, when the power transmission coil 24 is arranged to face the power reception coil 54 and AC power is supplied to the power transmission coil 24 , the electromagnetic induction between the power transmission coil 24 and the power reception coil 54 causes the power reception coil 54 to generate an alternating current power. Electricity is generated. That is, in the charging system 1 , the power receiving coil 54 receives the power without the conductive power transmitting coil 24 for power transmission and the conductive power receiving coil 54 being in electrical contact with each other.

The vehicle-mounted charger 80 converts the AC power received by the power receiving coil 54 into DC power and supplies the DC power to the battery 4 .

The DC/DC converter 82 converts the voltage of the DC power supplied from the battery 4 and supplies it to the second electromagnetic coil 52 . When power is supplied to the second electromagnetic coil 52, a magnetic field is generated around the second electromagnetic coil 52, and the second electromagnetic coil 52 functions as a magnet.

The second control unit 84 controls energization of the second electromagnetic coil 52 via the DC/DC converter 82 based on the magnetic flux density measured by the second magnetic sensor 56 .

The second communication unit 86 performs wireless communication (for example, Wi-Fi (registered trademark), etc.) with the power transmission device 10 . The second control unit 84 acquires various kinds of information from the power transmission device 10 side through communication through the second communication unit 86 .

FIG. 2 is a plan view showing the configuration of the first magnetic sensor 26. As shown in FIG. The first magnetic sensor 26 and the second magnetic sensor 56 have substantially the same configuration. Therefore, the configuration of the first magnetic sensor 26 will be described here, and the description of the configuration of the second magnetic sensor 56 will be omitted.

The first magnetic sensor 26 has a generally circular shape. The first magnetic sensor 26 includes a plurality of first detection lines 90 and a plurality of second detection lines 92 . The multiple first detection lines 90 extend parallel to each other in a predetermined direction (vertical direction in FIG. 2). The plurality of second detection lines 92 extend parallel to each other in a direction orthogonal to the first detection lines 90 (horizontal direction in FIG. 2). Therefore, when observed from the direction perpendicular to the first magnetic sensor 26, the first detection lines 90 and the second detection lines 92 appear to be arranged in a grid pattern.

FIG. 3 is an explanatory diagram illustrating detection of magnetic flux density by the first magnetic sensor 26. As shown in FIG. FIG. 3 also shows the relative position of the second magnetic sensor 56 with respect to the first magnetic sensor 26 . Note that the notation of the first detection line 90 and the second detection line 92 in the second magnetic sensor 56 is omitted.

Since the power transmission device 10 is supported and moved by the user during alignment, the magnetic flux density of the second electromagnetic coil 52 received by the first magnetic sensor 26 (the magnetic flux density of the first electromagnetic coil 22 received by the second magnetic sensor 56) is , will change with time. Therefore, a time-varying magnetic flux density acts on the first detection line 90 and the second detection line 92 , and current flows through the first detection line 90 and the second detection line 92 . For example, as the magnetic flux density acting on the first detection line 90 and the second detection line 92 increases, the current flowing through the first detection line 90 and the second detection line 92 increases. Further, for example, in the first magnetic sensor 26, the first detection line 90 through which the current flows out of the plurality of first detection lines 90 and the second detection line 92 through which the current flows out of the plurality of second detection lines 92 At the intersection of , the magnetic flux density acts.

Therefore, in the first magnetic sensor 26, based on the position of the intersection of the first detection line 90 and the second detection line 92 through which the current flows and the magnitude of the flowing current, the detected position and magnitude of the magnetic flux density can be measured. The same applies to the second magnetic sensor 56 as well. Hereinafter, the intersection of the first detection line 90 and the second detection line 92 may be called a measurement point. Note that the specific configurations of the first magnetic sensor 26 and the second magnetic sensor 56 are not limited to this example.

Here, the first electromagnetic coil 22 and the second electromagnetic coil 52 function as magnets, and a part of the second magnetic sensor 56 overlaps the first magnetic sensor 26 as shown in FIG. It is assumed that the At this time, the magnetic flux density of the second electromagnetic coil 52 measured by the first magnetic sensor 26 is is small. On the other hand, in the portion where the second magnetic sensor 56 overlaps on the first magnetic sensor 26 (hatched area A2 in FIG. 3A), the magnetic flux density of the second electromagnetic coil 52 measured by the first magnetic sensor 26 is growing.

Therefore, the first control unit 44 determines the ratio of measurement points at which the magnetic flux density is increased (current values of the first detection line 90 and the second detection line 92 are increased) to the total number of measurement points in the first magnetic sensor 26. (hereinafter referred to as the first wrap rate) is derived. The first wrap rate increases as the overlapping range of the second magnetic sensor 56 with respect to the first magnetic sensor 26 increases, that is, as the positions of the power receiving coil 54 with respect to the power transmitting coil 24 match. Then, the first control unit 44 determines whether or not the first wrap rate is greater than or equal to the predetermined wrap rate. The predetermined wrap rate is set to 90% to 95%, for example. Note that the predetermined wrap rate is not limited to the illustrated value.

The second control unit 84 also derives the ratio of measurement points with increased magnetic flux density to the total number of measurement points in the second magnetic sensor 56 (hereinafter referred to as the second wrap ratio). The second wrap rate increases as the overlapping range of the first magnetic sensor 26 with respect to the second magnetic sensor 56 increases, that is, as the positions of the power transmitting coil 24 and the power receiving coil 54 match. Then, the second control unit 84 determines whether or not the second wrap rate is equal to or greater than the predetermined wrap rate.

FIG. 3(b) shows a case where a foreign object (for example, a piece of metal) is present on the first magnetic sensor 26 as indicated by an area A10 surrounded by a dashed line. In this case, the magnetic flux density measured at the measurement point where the foreign matter is present becomes small.

Therefore, the first control unit 44 controls the magnetic flux density measured by the first magnetic sensor 26 to be equal to or less than a predetermined magnetic flux density within the range where the first magnetic sensor 26 and the second magnetic sensor 56 overlap (lapped). It is determined whether or not the portion is greater than or equal to a predetermined range. The predetermined magnetic flux density is set to a value smaller than the magnetic flux density measured when the first magnetic sensor 26 and the second magnetic sensor 56 overlap each other. The predetermined range is set according to the size of the foreign matter to be detected. If there are more than a predetermined range of portions where the magnetic flux density is equal to or lower than the predetermined magnetic flux density, it can be assumed that there is a foreign object on the first magnetic sensor 26 .

In addition, the second control unit 84 controls the magnetic flux density measured by the second magnetic sensor 56 to be equal to or lower than the predetermined magnetic flux density in the range where the first magnetic sensor 26 and the second magnetic sensor 56 overlap (lapped). It is determined whether or not the portion is greater than or equal to a predetermined range.

The first control unit 44 switches the current value of the first electromagnetic coil 22 in two steps. For example, when the power transmitting device 10 is attached to the charging connector 8 , the first control unit 44 causes the first electromagnetic coil 22 to flow a current having a predetermined first current value. The predetermined first current value is, for example, a current value at which the attractive force generated when the current of the first current value is applied to the first electromagnet coil 22 is approximately several kN. When such an attractive force is generated, the user can pull the first electromagnetic coil 22 away from the vehicle 2 or move it for alignment against the attractive force.

After that, the first control unit 44 determines that the first wrap rate is equal to or greater than the predetermined wrap rate and that there is no foreign matter, and that the second wrap rate is equal to or greater than the predetermined wrap rate and that there is no foreign matter on the power receiving side. , the current value of the first electromagnetic coil 22 is switched to a second current value that is greater than the first current value. The second current value is, for example, the attractive force generated when the current of the second current value is passed through the first electromagnetic coil 22, and is generated when the current of the first current value is passed through the first electromagnetic coil 22. It is a current value that is ten times or more (for example, about several tens of kN) the attractive force. When such an attractive force is generated, the first electromagnetic coil 22 is firmly fixed to the vehicle 2 to such an extent that it cannot be moved by the user.

Also, the second control unit 84 switches the current value of the second electromagnetic coil 52 in two stages. For example, when the magnetic flux density in at least a part of the measurable range of the second magnetic sensor 56 becomes equal to or higher than a predetermined magnetic flux density (when the magnetic flux density of the first electromagnetic coil 22 is detected), the second control unit 84 2. A current of a first current value is passed through the electromagnet coil 52 .

After that, the second control unit 84 determines that the second wrap rate is equal to or greater than the predetermined wrap rate and that there is no foreign matter, and that the first wrap rate is equal to or greater than the predetermined wrap rate and that there is no foreign matter on the power transmission side. , the current value of the second electromagnetic coil 52 is switched to the second current value. Thereby, the second electromagnetic coil 52 firmly fixes the power transmission device 10 (the charging connector 8 ) to the vehicle 2 .

As described above, in the charging system 1, when the first wrap rate and the second wrap rate are equal to or greater than the predetermined wrap rate (the position of the power transmitting coil 24 relative to the power receiving coil 54 is substantially the same) and no foreign matter is detected, power is transmitted. Coil 24 is firmly fixed to vehicle 2 . In other words, in charging system 1, power transmission coil 24 is not firmly fixed to vehicle 2 when a foreign object is detected even if the first wrap rate and the second wrap rate are equal to or greater than the predetermined wrap rate.

Note that the first wrap rate and the second wrap rate are basically the same value. However, for example, when either one of the first magnetic sensor 26 and the second magnetic sensor 56 fails, the first wrap rate and the second wrap rate may differ. Therefore, the first control unit 44 and the second control unit 84 confirm that the wrap rate on the other party is equal to or higher than a predetermined wrap rate. Since the wrap rate is redundant in this manner, the charging system 1 can more accurately determine whether the positions of the power transmitting coil 24 and the power receiving coil 54 match. In addition, since the charging system 1 has a redundant configuration for foreign matter detection, foreign matter can be detected more accurately.

The situation in which the first wrap rate differs from the second wrap rate (the situation in which foreign matter detection results differ) is not limited to the case where either one of the first magnetic sensor 26 and the second magnetic sensor 56 fails. For example, when a communication error occurs via the first communication unit 46 and the second communication unit 86, or when the first magnetic sensor 26 and the second magnetic sensor 56 erroneously detect the magnetic flux density due to electromagnetic noise or the like. Also in , the first wrap rate and the second wrap rate may be different (the detection result of the foreign matter may be different).

Also, when the lever 48 is turned on, the first control unit 44 and the second control unit 84 switch the current values of the first electromagnetic coil 22 and the second electromagnetic coil 52 from the second current value to the first current value. As a result, it is possible to separate the firmly fixed power transmission device 10 (charging connector 8 ) from the vehicle 2 .

FIG. 4 is a flowchart for explaining the operation of the first control unit 44 at the start of charging. In the initial state, no current flows through the first electromagnetic coil 22 and power is not supplied to the power transmission coil 24 .

The first control unit 44 first determines whether or not there is an activation request (S100). For example, the first control unit 44 determines that an activation request has been issued when the power transmitting device 10 is attached to the charging connector 8 . Further, for example, the first control unit 44 determines that there is an activation request when the charging connector 8 to which the power transmission device 10 is attached is removed from the charging stand 6 .

If there is no activation request (NO in S100), the first control unit 44 waits until there is an activation request. If there is an activation request (YES in S100), the first control unit 44 controls the AC/DC converter 42 to supply a current of the first current value to the first electromagnetic coil 22 (S110).

Next, the first controller 44 measures the magnetic flux density with the first magnetic sensor 26 (S120). Next, the first controller 44 derives the first wrap rate based on the measured magnetic flux density (S130). Next, the first control unit 44 determines whether or not the first wrap rate is greater than or equal to a predetermined wrap rate (S140).

If the first wrap rate is not equal to or greater than the predetermined wrap rate (NO in S140), the first control unit 44 considers that the end surface of the power transmission coil 24 does not match the end surface of the power reception coil 54, and the first electromagnetic coil 22 It is determined whether or not a predetermined time has passed since the current of the first current value started to flow (S150). The predetermined time is set, for example, in consideration of the time spent by the user for alignment of the power transmission device 10 .

If the predetermined time has not elapsed (NO in S150), the first control unit 44 returns to step S120 and repeats the processes after the measurement of the magnetic flux density. In other words, while the user is looking for a place where the positions of the power transmission device 10 match, the process from measuring the magnetic flux density to determining whether or not the first wrap rate is equal to or greater than the predetermined wrap rate is repeated. If the predetermined time has passed (YES in S150), the first control unit 44 causes the AC/DC converter 42 to stop the current flowing through the first electromagnetic coil 22 (S160), and ends the series of processes.

On the other hand, when the first wrap rate is equal to or greater than the predetermined wrap rate (YES in S140), first control unit 44 considers that the end face of power transmitting coil 24 substantially matches the end face of power receiving coil 54, and the magnetic flux density is the predetermined magnetic flux. It is determined whether or not there is a predetermined range or more of the portion where the density is less than or equal to (S170).

If there are more than a predetermined range of portions where the magnetic flux density is equal to or lower than the predetermined magnetic flux density (YES in S170), the first control unit 44 considers that there is a foreign object between the power transmitting coil 24 and the power receiving coil 54, and the predetermined time has passed. It is determined whether or not (S150). If the predetermined time has not passed (NO in S150), the first control unit 44 returns to step S120, and if the predetermined time has passed (YES in S150), the process proceeds to step S160. .

On the other hand, if the number of parts where the magnetic flux density is equal to or lower than the predetermined magnetic flux density does not exceed the predetermined range (NO in S170), the first control unit 44 considers that there is no foreign object between the power transmission coil 24 and the power reception coil 54, and It is determined whether or not the result sent from is a result that satisfies the conditions (S180). Specifically, similarly to the power transmission side, the power receiving side determines whether or not the second wrap rate is equal to or greater than a predetermined wrap rate, and determines whether or not there is a portion where the magnetic flux density is equal to or less than a predetermined magnetic flux density. A determination is made as to whether The first control unit 44 acquires these determination results on the power receiving side via the first communication unit 46 . If the result transmitted from the power receiving side indicates that the second wrap rate is equal to or higher than the predetermined wrap rate and the portion where the magnetic flux density is equal to or lower than the predetermined magnetic flux density is not in the predetermined range or more, It is determined that the result satisfies the conditions.

When the result transmitted from the power receiving side does not satisfy the condition (NO in S180), the first control unit 44 shifts the process to step S150 and determines whether or not the predetermined time has elapsed. For example, when the second magnetic sensor 56 on the power receiving side fails and the second wrap rate does not reach the predetermined wrap rate or more, the current of the first electromagnetic coil 22 is stopped after a predetermined time has passed.

On the other hand, if the result transmitted from the power receiving side satisfies the condition (YES in S180), first control unit 44 controls AC/DC converter 42 to supply first electromagnetic coil 22 with a second current value. (S190). That is, the first control unit 44 switches the current value of the first electromagnetic coil 22 from a predetermined first current value to a second current value greater than the first current value. As a result, the attractive force of first electromagnetic coil 22 is increased, and power transmitting device 10 (charging connector 8 ) is fixed to vehicle 2 with power transmitting coil 24 facing power receiving coil 54 .

After that, the first control unit 44 controls the power conversion device 40 to start power transmission from the power transmission coil 24 to the power reception coil 54 (S200), and ends the series of processes.

FIG. 5 is a flowchart for explaining the operation of the second control section 84 at the start of charging. In the initial state, no current flows through the second electromagnetic coil 52 and the power receiving coil 54 does not receive power.

The second control unit 84 first determines whether the magnetic flux density is detected by the second magnetic sensor 56 (S300). Specifically, the second control unit 84 determines whether or not the magnetic flux density has reached or exceeded a predetermined magnetic flux density in at least part of the measurable range of the second magnetic sensor 56 .

If the magnetic flux density is not detected (NO in S300), the second control unit 84 waits until the magnetic flux density is detected. On the other hand, if the magnetic flux density is detected (YES in S300), the second control unit 84 controls the DC/DC converter 82 to supply the current of the first current value to the second electromagnetic coil 52 (S310).

Next, the second controller 84 measures the magnetic flux density with the second magnetic sensor 56 (S320). Next, the second controller 84 derives a second wrap rate based on the measured magnetic flux density (S330). Next, the second control unit 84 determines whether or not the second wrap rate is equal to or greater than a predetermined wrap rate (S340).

If the second wrap rate is not equal to or greater than the predetermined wrap rate (NO in S340), the second control unit 84 considers that the end face of the power transmission coil 24 does not match the end face of the power reception coil 54, and the second electromagnetic coil 52 It is determined whether or not a predetermined time has passed since the current of the first current value started to flow (S350). The predetermined time is set, for example, in consideration of the time spent by the user for alignment of the power transmission device 10 .

If the predetermined time has not passed (NO in S350), the second control unit 84 returns to step S320 and repeats the steps after the measurement of the magnetic flux density. In other words, while the user is looking for a place where the positions of the power transmission device 10 match, the process from measuring the magnetic flux density to determining whether or not the second wrap rate is equal to or greater than the predetermined wrap rate is repeated. If the predetermined time has passed (YES in S350), the second control unit 84 causes the DC/DC converter 82 to stop the current flowing through the second electromagnetic coil 52 (S360), and ends the series of processes.

On the other hand, if the second wrap rate is equal to or greater than the predetermined wrap rate (YES in S340), second control unit 84 considers that the end face of power transmitting coil 24 substantially matches the end face of power receiving coil 54, and the magnetic flux density is the predetermined magnetic flux. A determination is made as to whether or not there is a predetermined range or more of the portion where the density is less than or equal to (S370).

If there are more than a predetermined range of portions where the magnetic flux density is equal to or lower than the predetermined magnetic flux density (YES in S370), the second control unit 84 considers that there is a foreign object between the power transmitting coil 24 and the power receiving coil 54, and the predetermined time has passed. It is determined whether or not (S350). If the predetermined time has not elapsed (NO in S350), the second control unit 84 returns to step S320, and if the predetermined time has elapsed (YES in S350), the process proceeds to step S360. .

On the other hand, if the number of portions where the magnetic flux density is equal to or lower than the predetermined magnetic flux density does not exceed the predetermined range (NO in S370), the second control unit 84 considers that there is no foreign object between the power transmitting coil 24 and the power receiving coil 54, and It is determined whether or not the result sent from is a result that satisfies the conditions (S380). Specifically, as described above, on the power transmission side as well, it is determined whether or not the first wrap rate is equal to or greater than the predetermined wrap rate, and whether or not the portion where the magnetic flux density is equal to or less than the predetermined magnetic flux density is greater than or equal to the predetermined range. A determination is made as to whether The second control unit 84 acquires those determination results on the power transmission side via the second communication unit 86 . If the result transmitted from the power transmission side indicates that the first wrap rate is equal to or greater than the predetermined wrap rate and the portion where the magnetic flux density is equal to or lower than the predetermined magnetic flux density is not within a predetermined range or more, It is determined that the result satisfies the conditions.

If the result transmitted from the power transmission side does not satisfy the condition (NO in S380), the second control unit 84 moves the process to step S350 and determines whether or not the predetermined time has elapsed. For example, when the first magnetic sensor 26 on the power transmission side fails and the first wrap rate does not reach the predetermined wrap rate or more, the current of the second electromagnetic coil 52 is stopped after a predetermined period of time.

On the other hand, if the result transmitted from the power transmission side satisfies the condition (YES in S380), the second control unit 84 controls the DC/DC converter 82 to supply the second electromagnetic coil 52 with a second current value. current is supplied (S390), and the series of processing ends. That is, the second control unit 84 switches the current value of the second electromagnetic coil 52 from a predetermined first current value to a second current value greater than the first current value. As a result, the attractive force of second electromagnetic coil 52 is increased, and power transmitting device 10 (charging connector 8 ) is fixed to vehicle 2 with power transmitting coil 24 facing power receiving coil 54 .

After that, when power transmission from the power transmission coil 24 to the power reception coil 54 is started, charging of the battery 4 is started by the power received by the power reception coil 54 .

FIG. 6 is a flowchart for explaining the operation of the first control section 44 at the end of charging. While power is being transmitted from the power transmission coil 24, the first control unit 44 determines whether or not there is a power transmission termination request (S500). For example, when the first control unit 44 receives a charge completion signal from the power receiving device 12 via the first communication unit 46, it determines that there is a power transmission end request. Further, for example, in the case of charging for a predetermined fee, the first control unit 44 determines that there is a power transmission end request when receiving a power transmission completion signal corresponding to the predetermined fee from the charging station 6 .

If there is no power transmission termination request (NO in S500), the first control unit 44 continues power transmission until there is a power transmission termination request. If there is a power transmission end request (YES in S500), the first control unit 44 controls the power conversion device 40 to stop power transmission through the power transmission coil 24 (S510). This terminates charging.

When charging is completed, the user holds the charging connector 8 and turns on the lever 48 in order to remove the power transmission device 10 (the charging connector 8 ) from the vehicle 2 . When the lever 48 is turned on, a control signal to that effect is transmitted to the first control unit 44 and to the power receiving device 12 through the first communication unit 46 .

Therefore, the first control unit 44 determines whether or not the lever 48 is turned on (S520). If the lever 48 is not turned on (NO in S520), the first control unit 44 waits until the lever 48 is turned on.

On the other hand, if the lever 48 is turned on (YES in S520), the first control unit 44 assumes that the user has performed the removal operation, and controls the AC/DC converter 42 to supply the first electromagnetic coil 22 with the first current. A current with a value is applied (S530). That is, the first control unit 44 switches the current value of the first electromagnetic coil 22 from the second current value to the first current value. As a result, the attractive force of the first electromagnetic coil 22 is reduced, and the power transmitting device 10 (charging connector 8) can be separated from the power receiving device 12 (vehicle 2) with a small force.

Next, the first control unit 44 determines whether the magnetic flux density is detected by the first magnetic sensor 26 (S540). Specifically, the first control unit 44 determines whether or not the magnetic flux density has reached or exceeded a predetermined magnetic flux density in at least part of the measurable range of the first magnetic sensor 26 . When magnetic flux density is detected (YES in S540), first control unit 44 considers that power transmitting device 10 (charging connector 8) is still in the vicinity of power receiving device 12 (vehicle 2), and magnetic flux density is no longer detected. Step S540 is repeated until

On the other hand, when the magnetic flux density is no longer detected (NO in S540), first control unit 44 considers that power transmitting device 10 (charging connector 8) is sufficiently separated from power receiving device 12 (vehicle 2), and the AC/DC converter 42 stops the current flowing through the first electromagnetic coil 22 (S550), and the series of processing ends.

FIG. 7 is a flowchart for explaining the operation of the second control section 84 at the end of charging. Assume that power is currently being transmitted from the power transmission coil 24 . For example, when the battery is charged for a predetermined fee, power transmission may be stopped before the battery is fully charged. Therefore, the second control unit 84 first determines whether power reception through the power receiving coil 54 has been stopped (S600). This is determined, for example, based on the measurement result of the current sensor provided in the power receiving coil 54 .

If power reception has not been stopped (NO in S600), the second control unit 84 determines whether or not charging has been completed (S610). Specifically, the second control unit 84 determines that charging is completed when the SOC of the battery 4 measured by the vehicle-mounted charger 80 becomes equal to or greater than a predetermined value (for example, a value indicating full charge).

If charging has not been completed (NO in S610), the second control unit 84 returns to step S600. On the other hand, if charging is completed (YES in S610), the second control unit 84 transmits a power transmission end request to the power transmission device 10 through the second communication unit 86 (S620), and returns to step S600. Upon receiving the power transmission termination request, the power transmission device 10 terminates power transmission through the power transmission coil 24 . Therefore, power reception through the power receiving coil 54 is stopped after transmission of the power transmission end request.

If power reception is stopped (YES in S600), the second control unit 84 determines whether or not the lever 48 is turned on (S630). If the lever 48 is not turned on (NO in S630), the second control unit 84 waits until the lever 48 is turned on.

If the lever 48 is turned on (YES in S630), the second control unit 84 controls the DC/DC converter 82 to supply the current of the first current value to the second electromagnetic coil 52 (S640). That is, the second controller 84 switches the current value of the second electromagnetic coil 52 from the second current value to the first current value. As a result, the attractive force of the second electromagnetic coil 52 is reduced, making it possible to separate the power transmitting device 10 (charging connector 8) from the power receiving device 12 (vehicle 2) with a small force.

Next, the second control unit 84 determines whether the magnetic flux density is detected by the second magnetic sensor 56 (S650). Specifically, the second control unit 84 determines whether or not the magnetic flux density has reached or exceeded a predetermined magnetic flux density in at least part of the measurable range of the second magnetic sensor 56 . When magnetic flux density is detected (YES in S650), second control unit 84 considers that power transmitting device 10 (charging connector 8) is still in the vicinity of power receiving device 12 (vehicle 2), and magnetic flux density is no longer detected. Step S650 is repeated until

On the other hand, when the magnetic flux density is no longer detected (NO in S650), second control unit 84 considers that power transmitting device 10 (charging connector 8) is sufficiently separated from power receiving device 12 (vehicle 2), and the DC/DC converter 82 stops the current in the second electromagnetic coil 52 (S660), and the series of processing ends.

As described above, in the charging system 1 of the present embodiment, the current of the first current value is passed through the first electromagnetic coil 22, and the first wrap rate is derived based on the magnetic flux density measured by the first magnetic sensor 26. , a current having a second current value larger than the first current value is caused to flow through the first electromagnetic coil 22 when the first wrap rate is equal to or greater than the predetermined wrap rate. Therefore, in the charging system 1 of the present embodiment, the positions of the power transmitting coil 24 and the power receiving coil 54 are substantially matched before being fixed.

Therefore, according to the charging system 1 of the present embodiment, it is possible to suppress the positional deviation of the charging connector 8 when it is fixed.

Further, in the charging system 1 of the present embodiment, the first control unit 44 causes the current of the second current value to flow through the first electromagnet when both the first wrap rate and the second wrap rate are equal to or higher than the predetermined wrap rate. Flow through coil 22 . Also, the second control unit 84 causes the current of the second current value to flow through the second electromagnetic coil 52 when both the first wrap rate and the second wrap rate are greater than or equal to the predetermined wrap rate. Therefore, in the charging system 1 of the present embodiment, it is possible to more accurately detect that the power transmitting coil 24 is aligned with the power receiving coil 54 .

Further, in the charging system 1 of the present embodiment, the portion where one or both of the magnetic flux density measured by the first magnetic sensor 26 and the magnetic flux density measured by the second magnetic sensor 56 is equal to or lower than a predetermined magnetic flux density is greater than or equal to a predetermined range. In some cases, the first controller 44 and the second controller 84 do not switch the current values of the first electromagnetic coil 22 and the second electromagnetic coil 52 to the second current value. Therefore, in the charging system 1 of the present embodiment, it is possible to prevent the power transmitting coil 24 from being fixed while there is a foreign object between the power receiving coil 54 and the power transmitting coil 24 .

In addition, in the charging system 1 of the present embodiment, the second control unit 84 controls the second electromagnetic coil 52 when the magnetic flux density in at least part of the measurable range of the second magnetic sensor 56 becomes equal to or higher than a predetermined magnetic flux density. A current of a first current value is applied to the . Therefore, in the charging system 1 of the present embodiment, the power transmission device 10 can be aligned without causing the user to perform the operation of energizing the second electromagnetic coil 52 .

In the above-described embodiment, the second control unit 84 may cause the current of the first current value to flow through the second electromagnetic coil 52 when the user turns on an operation button provided in the vehicle interior or the like.

Further, in the above-described embodiment, the first control unit 44 controls the first electromagnetic coil 22 when the condition on the power transmission side is satisfied, regardless of whether the result transmitted from the power reception side satisfies the condition. may be switched. Further, the second control unit 84 switches the current value of the second electromagnetic coil 52 when the condition on the power receiving side is satisfied, regardless of whether the result transmitted from the power transmitting side satisfies the condition. may be performed.

Further, in the above-described embodiment, the first control unit 44 and the second control unit 84 may omit the determination of whether or not the portion where the magnetic flux density is equal to or less than the predetermined magnetic flux density exists in a predetermined range or more. However, in this case, since the foreign matter is not detected, it is more preferable to make the determination.

Further, in the above-described embodiment, the first control unit 44 controls the current flowing through the first electromagnetic coil 22 so that various information can be added to the magnetic flux density generated by the first electromagnetic coil 22 and transmitted. good. In this case, the second control unit 84 can receive various information from the power transmission device 10 by the second magnetic sensor 56 . Further, the second control unit 84 may add various information to the magnetic flux density generated by the second electromagnetic coil 52 and transmit the information by controlling the current flowing through the second electromagnetic coil 52 . In this case, the first control unit 44 can receive various information from the power receiving device 12 using the first magnetic sensor 26 .

Further, in the above embodiment, the power transmission coil 24 is wound around the first electromagnetic coil 22 and the power reception coil 54 is wound around the second electromagnetic coil 52 . However, the positional relationship between the first electromagnetic coil 22 and the power transmitting coil 24 and the positional relationship between the second electromagnetic coil 52 and the power receiving coil 54 are not limited to this example. For example, one or more first electromagnetic coils 22 are provided outside the power transmission coil 24, and one or more second electromagnetic coils 52 are arranged outside the power reception coil 54 so as to face the first electromagnetic coils 22. may be provided.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such embodiments. It is obvious that a person skilled in the art can conceive of various modifications or modifications within the scope of the claims, and it should be understood that these also belong to the technical scope of the present invention. be done.

INDUSTRIAL APPLICABILITY The present invention can be used in a charging system for charging a vehicle battery.

1 charging system 2 vehicle 4 battery 10 power transmitting device 12 power receiving device 22 first electromagnetic coil 24 power transmitting coil 26 first magnetic sensor 40 power conversion device 44 first control unit 52 second electromagnetic coil 54 power receiving coil 56 second magnetic sensor 84 2 control unit

Claims (6)

a power transmission coil for transmitting power to the vehicle in the power transmission device;
a first electromagnetic coil provided in the power transmission device and functioning as a magnet when energized;
a first magnetic sensor provided at or near an end face of the first electromagnetic coil and measuring a magnetic flux density;
a first control unit that controls energization of the first electromagnetic coil;
has
The first control unit causes current of a predetermined first current value to flow through the first electromagnetic coil, and based on the magnetic flux density measured by the first magnetic sensor, the power transmitting coil and the power receiving unit mounted on the vehicle. In the device, a first wrap rate with a power receiving coil that receives power from the power transmitting coil in a non-contact manner is derived, and when the first wrap rate is equal to or greater than a predetermined wrap rate, a first current value greater than the first current value is derived. A charging system in which currents of two current values flow through the first electromagnetic coil. a second electromagnetic coil provided in the power receiving device and functioning as a magnet when energized;
a second magnetic sensor provided at or near an end face of the second electromagnetic coil and measuring a magnetic flux density;
a second control unit that controls energization of the second electromagnetic coil;
has
The second control unit causes current of the first current value to flow through the second electromagnetic coil, and a second wrap between the power transmission coil and the power reception coil based on the magnetic flux density measured by the second magnetic sensor. Derive the rate,
The first control unit supplies a current of the second current value to the first electromagnetic coil when both the first wrap rate and the second wrap rate are equal to or greater than a predetermined wrap rate,
2. The second control unit causes the current of the second current value to flow through the second electromagnetic coil when both the first wrap rate and the second wrap rate are greater than or equal to a predetermined wrap rate. The charging system described in . The second control unit causes the current of the first current value to flow through the second electromagnetic coil when the magnetic flux density in at least a part of the measurable range of the second magnetic sensor is equal to or higher than a predetermined magnetic flux density. Item 3. The charging system according to Item 2. In the range where the first magnetic sensor and the second magnetic sensor overlap, one or both of the magnetic flux density measured by the first magnetic sensor and the magnetic flux density measured by the second magnetic sensor are at a predetermined magnetic flux density 2. When there is a predetermined range or more of the portion where the current value is equal to or less than the predetermined range, the first control unit and the second control unit do not switch the current values of the first electromagnetic coil and the second electromagnetic coil to the second current value. Or the charging system according to 3. a power receiving coil that receives power in a non-contact manner in a power receiving device mounted on a vehicle;
a second electromagnetic coil provided in the power receiving device and functioning as a magnet when energized;
a second magnetic sensor provided at or near an end face of the second electromagnetic coil and measuring a magnetic flux density;
a second control unit that controls energization of the second electromagnetic coil;
has
The second control unit causes a current having a predetermined first current value to flow through the second electromagnetic coil, and a power transmission coil for transmitting power to the vehicle in the power transmission device based on the magnetic flux density measured by the second magnetic sensor. and the power receiving coil, and when the second wrap rate is equal to or greater than a predetermined wrap rate, a current having a second current value larger than the first current value is supplied to the second electromagnetic coil charging system that feeds into a power transmission coil for transmitting power to the vehicle in the power transmission device;
a first electromagnetic coil provided in the power transmission device and functioning as a magnet when energized;
a first magnetic sensor provided at or near an end face of the first electromagnetic coil and measuring a magnetic flux density;
a first control unit that controls energization of the first electromagnetic coil;
a power receiving coil that receives power in a non-contact manner in the power receiving device mounted on the vehicle;
a second electromagnetic coil provided in the power receiving device and functioning as a magnet when energized;
a second magnetic sensor provided at or near an end face of the second electromagnetic coil and measuring a magnetic flux density;
a second control unit that controls energization of the second electromagnetic coil;
has
The first control unit causes a current having a predetermined first current value to flow through the first electromagnetic coil, and based on the magnetic flux density measured by the first magnetic sensor, the first current between the power transmission coil and the power reception coil. deriving a wrap rate, and when the first wrap rate is equal to or greater than a predetermined wrap rate, flowing a current of a second current value larger than the first current value to the first electromagnetic coil;
The second control unit causes current of a predetermined first current value to flow through the second electromagnetic coil, and based on the magnetic flux density measured by the second magnetic sensor, a second current between the power transmitting coil and the power receiving coil. A charging system for deriving a wrap rate, and for supplying a current having a second current value larger than the first current value to the second electromagnetic coil when the second wrap rate is equal to or greater than a predetermined wrap rate.

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