JP2013172499A - Non-contact power transmission system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-contact power transmission system capable of reducing charging cost.SOLUTION: A power transmission system 100 transmits electrical power from a power supply device 10 to a power incoming device 20 in a non-contact manner. The power supply device 10 includes a communication part 13 and a power supply coil 12. The power incoming device 20 includes a communication part 29, a power incoming coil 21, and a rectifier unit 22. The power supply device 10 or power incoming device 20 includes a timer input part 30 that presets the charging start time of a power storage device 23. The power transmission system 100 determines a power transmission environment from the power supply device 10 to the power incoming device 20 by performing pre-charging, and shifts to a stand-by state when the power transmission environment is an environment capable of transmitting electrical power. After the charging start time, the power transmission environment is determined again by performing pre-charging again. When the power transmission environment is an environment capable of transmitting electrical power, the power storage device 23 is charged.

Description

  The present invention relates to a non-contact power transmission system for performing non-contact power transmission.

  As environmentally friendly vehicles, electric vehicles such as electric vehicles and hybrid vehicles have been put into practical use. In an electric vehicle, an in-vehicle power storage device (for example, a battery) can be charged from a power source (for example, a power outlet) outside the vehicle. For example, charging is performed by connecting a power outlet provided at home or a common facility to a charging port provided in the vehicle with a charging cable. On the other hand, plug-in hybrid vehicles that enable charging of an in-vehicle power storage device from a power source outside the vehicle have also been put to practical use.

  Incidentally, in recent years, non-contact power feeding without using a cable has attracted attention as a power feeding method from the outside of the vehicle to the vehicle. As a non-contact power feeding method, for example, a method using electromagnetic coupling (a method using electromagnetic induction, a method using electromagnetic waves, a resonance method, etc.) has been studied. Patent Document 1 discloses a contactless power feeding system using a resonance method.

  In the resonance method, the positional deviation (distance) between the power transmitting side resonator (self-resonant coil) and the power receiving side resonator (self-resonant coil) affects the transmission efficiency. In order to improve the transmission efficiency, communication between the power transmission side (infrastructure side) and the power reception side (vehicle side) is performed by the driver's parking operation, so that the resonator on the power transmission side and the resonator on the power reception side are connected. Need to align.

International Publication No. 2011/001524 Pamphlet

  By the way, in the non-contact power feeding system disclosed in Patent Document 1, the power feeding flow is started as soon as the vehicle is parked. However, since the electricity charges differ between day and night, for example, if parking is performed during the daytime when the electricity charges are high, there is a problem that the charging cost is high.

  Then, this invention aims at providing the non-contact electric power transmission system which can reduce charging cost.

  The contactless power transmission system of the present invention performs power transmission in a contactless manner from a contactless power feeding device to a contactless power receiving device. The non-contact power supply device supplies power to the non-contact power receiving device using electromagnetic coupling according to the wireless communication by the power supply wireless communication unit that performs wireless communication with the non-contact power receiving device and the wireless communication by the power supply wireless communication unit. The non-contact power receiving device includes a power receiving wireless communication unit that performs wireless communication with the non-contact power feeding device, and non-contact power feeding using electromagnetic coupling according to wireless communication by the power receiving wireless communication unit. A non-contact power feeding device or a non-contact power receiving device comprising: a power receiving coil for acquiring power from the device; and a rectifier unit that rectifies AC power from the power receiving coil and generates a DC voltage for charging the power storage device However, it further includes a timer input unit for presetting the charging start time of the power storage device. In this non-contact power transmission system, the pre-charging is performed between the non-contact power feeding device and the non-contact power receiving device, so that the power transmission environment from the non-contact power feeding device to the non-contact power receiving device is determined. When the power transmission environment is an environment where power transmission is possible, the contactless power feeding device and the contactless power receiving device shift to a standby state, and after the charging start time has elapsed, the contactless power feeding device and the contactless power receiving device When the power transmission environment is determined again by the non-contact power feeding device or the non-contact power receiving device by re-precharging with the device, and the power transmission environment is an environment capable of power transmission, the non-contact power feeding device In addition, the power storage device is charged by the non-contact power receiving device.

  According to this non-contact power transmission system, since the charging start time can be set in advance by the timer input unit, for example, charging can be performed in a time zone where the electricity rate is relatively low. Therefore, the charging cost can be reduced.

  Here, if a foreign object enters between the power feeding coil and the power receiving coil, or if the relative position between the power feeding coil and the power receiving coil is shifted, appropriate power is not transmitted from the non-contact power feeding device to the non-contact power receiving device. The power storage device cannot be charged properly. Furthermore, the load of the non-contact power feeding apparatus increases, which may cause a safety problem. There is also a problem in safety when an animal or the like enters between the power supply coil and the power reception coil.

  Therefore, in this non-contact power transmission system, the pre-charging is performed to determine the power transmission environment from the non-contact power feeding device to the non-contact power receiving device, and when the power transmission environment is an environment capable of power transmission, Migrate to For example, in the precharge, when the transmission power from the non-contact power supply device to the non-contact power reception device is the power equivalent to the set power for charging the power storage device, a foreign object or animal is interposed between the power supply coil and the power reception coil. And the relative positions of the power feeding coil and the power receiving coil are matched, and it is determined that the power transmission environment from the non-contact power feeding device to the non-contact power receiving device is an environment where power can be transmitted. Thus, charging can be performed reliably at the charging start time.

  By the way, in the case of non-contact power feeding, the power transmission environment may change due to some external factor during the standby state. For example, a foreign object, an animal, or the like may enter between the power feeding coil and the power receiving coil, and there is a possibility of changing to an environment where power transmission cannot be performed appropriately.

  However, according to this non-contact power transmission system, even when the charging start time elapses, the above power transmission environment is determined again by performing precharging again, and the power transmission environment is an environment in which power transmission is possible. In this case, since charging of the power storage device is started, charging can be performed more reliably.

  When the above-described non-contact power receiving apparatus changes the power transmission environment during the standby state, it is preferable to notify the non-contact power feeding apparatus of the charging stop by the power receiving wireless communication unit.

  Here, in the case of non-contact power feeding, the user forgets to set the timer and leaves the vehicle (non-contact power receiving device) at the charging start time (power transmission environment, for example, the relative position between the power feeding coil and the power receiving coil) In such a case, the non-contact power feeding device will be in an error state.

  However, according to this non-contact power transmission system, it is possible to instruct the non-contact power supply apparatus to stop charging by notifying the non-contact power supply apparatus of the non-contact power supply apparatus, so that the non-contact power supply apparatus enters an error state. There is no.

  In addition, the above-described non-contact power transmission system may make a connection request to the non-contact power feeding device by the power receiving wireless communication unit before re-precharging after the charging start time has elapsed. In addition, the above-described contactless power transmission system may search for a contactless power feeding device by the power receiving wireless communication unit before performing re-precharge after the charging start time has elapsed.

  According to the present invention, the charging cost can be reduced.

It is a schematic diagram which shows the structure of the electric power system of the non-contact electric power transmission system which concerns on one Embodiment of this invention. It is a circuit block diagram which shows the electric power and control system of the non-contact electric power transmission system which concern on one Embodiment of this invention. It is a flowchart which shows operation | movement of the non-contact electric power supply apparatus of this embodiment shown in FIG. It is a flowchart which shows operation | movement of the vehicle (non-contact power receiving apparatus) of this embodiment shown in FIG.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals.

  FIG. 1 is a schematic diagram illustrating a configuration of a power system of a contactless power transmission system according to an embodiment of the present invention, and FIG. 2 illustrates power and control of the contactless power transmission system according to an embodiment of the present invention. It is a circuit block diagram which shows a system | strain. A non-contact power transmission system 100 shown in FIGS. 1 and 2 includes a non-contact power feeding apparatus 10 provided in a charging parking space at home or a common facility (for example, a gas station), and an electric vehicle such as an electric vehicle or a hybrid vehicle ( A non-contact power receiving device) 20 for power transmission from the non-contact power feeding device 10 to the vehicle 20 in a non-contact manner.

  The non-contact power feeding device 10 includes an inverter unit 11, a power feeding coil unit 12, a wireless communication unit 13, and a parking detection sensor 14. On the other hand, the vehicle 20 includes a power receiving coil unit 21, a rectifier unit 22, a driving battery (power storage device) 23, a rectifier relay 24, a battery monitoring unit 25, a power management ECU (Electronic Control Unit) 26, and power feeding. A control ECU (Electronic Control Unit) 27, a power supply start switch 28, a wireless communication unit 29, and a timer input device 30 are provided.

  First, in the non-contact power supply apparatus 10, the inverter unit 11 has an inverter, and converts a system power supply (commercial power supply) from an electric power company into high-frequency power. The inverter unit 11 supplies this high frequency power (high frequency current) to the feeding coil unit 12.

  The power feeding coil unit 12 has a power feeding coil, and uses the electromagnetic induction action between the power feeding coil and the power receiving coil in the power receiving coil unit 21 to supply power supplied from the inverter unit 11 to the power receiving coil unit 21 in a non-contact manner. Supply. For example, the feeding coil unit 12 is provided on the floor surface of the charging parking space.

  The wireless communication unit 13 communicates wirelessly with the wireless communication unit 29 in the vehicle 20, and transmits and receives various types of information between the contactless power supply device 10 and the vehicle 20. Information transmitted from the non-contact power supply apparatus 10 to the vehicle 20 includes a connection response, precharge OK / NG, a power supply stop request, which will be described later, and information transmitted from the vehicle 20 to the non-contact power supply apparatus 10 will be described later. The connection request, the precharge request, the output power (current) of the rectifier unit 22, the state of charge of the battery, the power supply stop request, and the like. In the present embodiment, the wireless communication unit 13 is mounted on the inverter unit 11.

  The parking detection sensor 14 detects whether or not the vehicle 20 is parked in the charging parking space, and activates the wireless communication unit 13 when the vehicle 20 is parked (set to an on state). On the other hand, the parking detection sensor 14 stops the wireless communication unit 13 when the vehicle 20 leaves the charging parking space (sets to an off state). Various sensors such as a load sensor, an ultrasonic sensor, and an infrared sensor can be applied as the parking detection sensor 14.

  Next, in the vehicle 20, the power receiving coil unit 21 has a power receiving coil, and acquires AC power from the power feeding coil unit 12 in a non-contact manner using the electromagnetic induction action as described above. For example, the power receiving coil unit 21 is provided on the bottom surface of the vehicle body.

  The rectifier unit 22 rectifies the AC power acquired by the power receiving coil unit 21 and converts it into DC power. Moreover, the rectifier unit 22 has a DC / DC converter, and raises / lowers the rectified DC power to the battery voltage equivalent. Further, the rectifier unit 22 has a voltage sensor, and by monitoring the voltage of the drive battery 23 via the rectifier relay 24, the drive battery 23 is in a fully charged state or a state close to full charge. Whether or not there is can be monitored. The rectifier unit 22 is connected to the drive battery 23 via the rectifier relay 24.

  The driving battery 23 is a DC power source that can be recharged by a DC voltage from the rectifier unit 22. For example, as the driving battery 23, a secondary battery such as lithium ion or nickel metal hydride can be applied.

  The rectifier relay 24 connects the rectifier unit 22 to the drive battery 23 when charging. When charging is not performed, the rectifier relay 24 releases the connection between the rectifier unit 22 and the drive battery 23.

  The battery monitoring unit 25 monitors the state of the driving battery 23 for each cell, and transmits a battery state in which the state of each cell is integrated to the power management ECU 26. For example, the battery monitoring unit 25 monitors the balance of the charging state of each cell, or performs abnormality detection for each cell (fail safe). In the present embodiment, the battery monitoring unit 25 is mounted on the driving battery 23.

  The power management ECU 26 manages the state of the drive battery 23 during power feeding and during travel. The state of the driving battery 23 includes SOC (State Of Charge), voltage, current, temperature, and the like.

  The power supply control ECU 27 performs overall control when power is supplied from the non-contact power supply apparatus 10 to the vehicle 20. For example, when the power supply control ECU 27 supplies power to the vehicle 20 from the non-contact power supply device 10, the rectifier relay 24 is turned on so that the drive battery 23 can be charged by the rectifier unit 22, and the output adjustment of the rectifier unit 22 is adjusted. Do. On the other hand, when power is not supplied from the non-contact power supply apparatus 10 to the vehicle 20, the power supply control ECU 27 turns off the rectifier relay 24 and disconnects the drive battery 23 from the rectifier unit 22. The power supply control ECU 27 performs activation control of the power management ECU 26 and the wireless communication unit 29 when the vehicle 20 is parked in the parking space, and the power management ECU 26 and the wireless communication unit when the vehicle 20 is parked from the parking space. 29 stop control is performed. Note that the rectifier unit 22, the power management ECU 26, and the wireless communication unit 29 and the power supply control ECU 27 are connected by, for example, a CAN (Controller Area Network).

  Further, the power supply control ECU 27 turns on the rectifier relay 24 in accordance with the operation of the power supply start switch 28 by the user, and enables the drive battery 23 to be charged by the rectifier unit 22 described above.

  Further, the power supply control ECU 27 presets the charging start time of the driving battery 23 in accordance with the operation of the timer input device 30 by the user. The power supply control ECU 27 operates the vehicle 20 in the low power consumption mode (standby state) before the charging start time, and starts charging the battery when the charging start time elapses.

  The wireless communication unit 29 wirelessly communicates with the wireless communication unit 13 in the contactless power supply device 10 and transmits and receives the various types of information described above between the vehicle 20 and the contactless power supply device 10. In the present embodiment, the wireless communication unit 29 is mounted on the rectifier unit 22.

  Next, a non-contact power transmission method from the non-contact power feeding apparatus 10 to the vehicle (non-contact power receiving apparatus) 20 will be described. FIG. 3 is a flowchart showing the operation of the non-contact power feeding apparatus 10, and FIG. 4 is a flowchart showing the operation of the vehicle 20.

  First, as shown in FIG. 3, on the non-contact power feeding apparatus 10 side, the presence or absence of a parked vehicle is detected by the parking detection sensor 14 continuously or intermittently (S101). At this time, the wireless communication unit 13 that requires power for operation is in a stopped state.

  On the other hand, as shown in FIG. 4, on the vehicle 20 side, the power supply control ECU 27 continuously or intermittently monitors whether or not the vehicle is parked in the parking space (S201). At this time, the power management ECU 26 and the wireless communication unit 29 that require power for operation are in a stopped state. For example, the power supply control ECU 27 determines the completion of parking by a gear parking operation.

  When parking is completed, the charging ratio with respect to the full charge of the battery is monitored, and it is determined whether or not charging is performed according to the charging ratio. For example, when the charging rate is equal to or less than a predetermined value (for example, 80% of the fully charged state: the first predetermined rate), a search on the power feeding side is started for charging, and the charging rate is greater than the predetermined value. Determines that it is in a fully charged state or a state close to full charging, and does not search for the power supply side.

  Specifically, the power supply control ECU 27 turns on the rectifier relay (S202), and the rectifier unit 22 monitors the battery voltage correlated with the charging ratio with respect to the full charge (S203). When the battery voltage is equal to or lower than a predetermined value (for example, a voltage value of 80% of the voltage in the fully charged state: a first predetermined value correlated with the first predetermined ratio), the power supply control ECU 27 performs the wireless communication unit 29. And the wireless communication unit 29 starts searching for a communication device on the non-contact power feeding apparatus 10 side (S204). The power supply control ECU 27 also activates the power management ECU 26. If the battery voltage is greater than the predetermined value, it is determined that the battery is fully charged or nearly full, and the process proceeds to step S220 described below.

  On the other hand, as shown in FIG. 3, on the non-contact power feeding apparatus 10 side, the parking detection sensor 14 detects the vehicle 20 parked in the charging parking space, activates the wireless communication unit 13, and enables the wireless function. (S102).

  Then, as shown in FIG. 4, on the vehicle 20 side, the wireless communication unit 29 recognizes the wireless communication unit 13 of the non-contact power feeding apparatus 10 (S205) and transmits a connection request (S206). If no wireless device is found, the process proceeds to step S220 described later.

  When the connection request is transmitted from the vehicle 20 side, as shown in FIG. 3, the wireless communication unit 13 recognizes the connection request on the non-contact power supply apparatus 10 side (S103) and transmits a connection response (S104). . If there is no connection request, the connection request is waited until a predetermined time has elapsed since the detection of the parked vehicle. When the predetermined time has elapsed, it is determined that the parked vehicle has no intention to charge, and the process proceeds to step S119 described later. (S105).

  When a connection response is transmitted from the non-contact power supply apparatus 10 side, as shown in FIG. 4, the vehicle 20 side recognizes the connection response by the wireless communication unit 29 (S207), and transmits a precharge request (S208). ). When there is no connection response, the process proceeds to step S220 described later.

  When the precharge request is transmitted from the vehicle 20 side, as shown in FIG. 3, the wireless communication unit 13 recognizes the precharge request on the non-contact power supply device 10 side (S106), and the inverter unit 11 and the power supply coil unit. 12 starts precharge output (S107). If there is no precharge request, it waits for a precharge request until a predetermined time elapses from the detection of the connection request, and when a predetermined time elapses from the detection of the connection request, it is determined that the parked vehicle has no intention of charging, The process proceeds to step S119 described later (S108).

  Here, precharging is a test of the power transmission environment prior to full-scale power supply, and is performed with smaller power than full-scale power supply. If foreign matter enters between the power feeding coil and the power receiving coil, or if the relative position between the power feeding coil and the power receiving coil is shifted, appropriate power is not transmitted from the non-contact power feeding device 10 to the vehicle 20, and the battery is properly used. Can't be charged. Furthermore, the load of the non-contact power supply apparatus 10 may increase, which may cause a safety problem. There is also a problem in safety when an animal or the like enters between the power supply coil and the power reception coil. Therefore, in the precharge, when the transmission power from the non-contact power supply apparatus 10 to the vehicle 20 is equivalent to the set power for charging the battery, there is a foreign object or animal between the power supply coil and the power reception coil. It is determined that the power transmission environment from the non-contact power feeding device 10 to the vehicle 20 is an environment in which power transmission is possible because the power supply coil and the power reception coil are in the proper positions.

  Specifically, during the precharge, on the non-contact power feeding device 10 side, the wireless communication unit 13 acquires the output power (current) information of the rectifier unit 22 from the vehicle 20 side, and the output power (current) of the rectifier unit 22 is obtained. Is determined to be greater than or equal to a predetermined value (S109). When the output power (current) of the rectifier unit 22 is equal to or greater than a predetermined value, it is determined that the power transmission environment is an environment in which power transmission is possible, and the wireless communication unit 13 notifies the vehicle 20 side of precharge OK. (S110). On the other hand, when the output power (current) of the rectifier unit 22 is less than the predetermined value, it is determined that there is some problem in the power transmission environment, and the wireless communication unit 13 notifies the vehicle 20 side of the precharge NG. (S111), the process proceeds to step S118 described later.

  In the case of precharge NG, the parking position adjustment is notified to the user, the position of the power receiving coil on the vehicle 20 side with respect to the power feeding coil on the non-contact power feeding device 10 side is adjusted, and the above operation is performed again.

  When the precharge OK is notified from the non-contact power supply apparatus 10 side, as shown in FIG. 4, the vehicle 20 side recognizes the precharge OK by the wireless communication unit 29 (S209) and waits for the main charge. On the other hand, when the precharge NG is recognized by the wireless communication unit 29, the process proceeds to step S219 described later.

  When the precharge OK is recognized, it is confirmed whether or not the power supply start flag is on. The power supply start flag is turned off when the charging start time is set by the timer input device 30 and the power supply control ECU 27 (S210). When there is a charge start time setting and the power supply start flag is in the OFF state, the wireless communication unit 29 transmits a power supply interruption request (S211), and shifts to the low power consumption mode (standby state) (S212). For example, in the low power consumption mode, the rectifier unit 22, the power management ECU 26, the power supply control ECU 27, and the wireless communication unit 29 are operated with low power consumption. Further, the rectifier relay 24 is turned off.

  On the other hand, as shown in FIG. 3, the wireless communication unit 13 recognizes a power supply interruption request on the non-contact power supply apparatus 10 side (S112), and shifts to a low power consumption mode (standby state) (S113). For example, in the low power consumption mode, the inverter unit 11 and the wireless communication device 13 are operated with low power consumption.

  Here, in the case of non-contact power feeding, the user forgets to set the timer and leaves the vehicle (non-contact power receiving device) 20 at the charging start time (power transmission environment, for example, the relative relationship between the power feeding coil and the power receiving coil). In such a case, the non-contact power feeding device 10 enters an error state.

  Therefore, as shown in FIG. 4, when leaving the vehicle during the low power consumption mode, the user is prompted to cancel the charge, and when the user cancels the charge (S213), the wireless communication unit 29 cancels the charge. A request (charge stop notification) is transmitted (S214), and the process proceeds to step S219 described later.

  On the other hand, as shown in FIG. 3, when the wireless communication unit 13 recognizes a cancel request from the vehicle 20 side on the non-contact power feeding apparatus 10 side, the process proceeds to step S119 described later (S114). Thereafter, the wireless communication unit 13 waits while continuously or intermittently monitoring a connection request from the vehicle 20 side (S115).

  Next, as shown in FIG. 4, on the vehicle 20 side, when the charging start time is reached, the charging start flag is turned on (S216), and the processing from step S201 to step S210 described above is performed again. That is, after the charging start time elapses, the communication device search on the non-contact power supply apparatus 10 side, the connection request to the non-contact power supply apparatus 10 side, and the precharge are sequentially performed again to determine the power transmission environment again. If the power transmission environment has changed, the power transmission environment is adjusted again.

  Then, as shown in FIG. 3, the wireless communication unit 13 recognizes the connection request from the vehicle 20 side (S115) on the non-contact power feeding device 10 side, and the above-described steps S104 and S106 to S112 are performed. Repeat the process.

  On the other hand, as shown in FIG. 4, on the vehicle 20 side, when the charging start time is not set and the power supply start flag is on in step S210, the wireless communication unit 29 transmits a power supply start request. (S217).

  Then, as shown in FIG. 3, the wireless communication unit 13 recognizes a power supply start request on the non-contact power supply apparatus 10 side (S112) and starts full-scale power supply (S116). During power feeding, on the non-contact power feeding apparatus 10 side, the wireless communication unit 13 acquires information on the battery charge state from the vehicle 20 side, and continuously or intermittently monitors the battery charge state. On the non-contact power feeding apparatus 10 side, the wireless communication unit 13 monitors the power feeding stop request from the vehicle 20 side continuously or intermittently (S117). When the battery reaches a fully charged state, it is determined that charging is complete, the power supply output is stopped (S118), and the connection is released (S119). If a request for stopping power supply is received, it is determined that the vehicle 20 has no intention of charging due to some problem, power supply output is stopped (S118), and connection is released (S119).

  On the other hand, referring to FIG. 4, during power feeding, on the vehicle 20 side, the wireless communication unit 13 continuously or intermittently monitors a request for power feeding stop from the non-contact power feeding device 10 side (S218). When a request for stopping power supply is received, it is determined that the contactless power supply apparatus 10 cannot supply power due to some problem, and the connection is released (S219).

  Thereafter, on the vehicle 20 side, the rectifier relay 24 is turned off by the power supply control ECU 27 (S220). Thereafter, on the vehicle 20 side, the operation of the power supply start switch 28 by the user, that is, the presence or absence of the user's power supply request is continuously or intermittently monitored. If there is a power supply request, the process returns to step S201 and the above operation is performed. Again. On the vehicle 20 side, parking cancellation is monitored continuously or intermittently, and when the vehicle leaves the parking space, the process returns to step S201 (S221).

  On the other hand, referring back to FIG. 3, the contactless power supply apparatus 10 returns to step S104 when there is a connection request again after the end of power supply (S120), and when there is no connection request, the parking detection sensor 14 performs parking. The departure of the vehicle is monitored continuously or intermittently (S121). And when a parked vehicle leaves, the wireless communication part 13 is stopped, a wireless function is invalidated (S122), and it returns to step S101.

  According to the non-contact power transmission system 100 of the present embodiment, since the charging start time can be set in advance by the timer input device 30, for example, charging can be performed at night time when the electricity rate is relatively low. it can. Therefore, the charging cost can be reduced.

  Further, according to the contactless power transmission system 100 of the present embodiment, after the vehicle 20 is parked, the power transmission environment from the contactless power supply apparatus 10 to the vehicle 20 is determined by performing precharging, and the power transmission environment is the power transmission. Since it shifts to the low power consumption mode (standby state) when it is a possible environment, charging can be performed reliably at the charging start time.

  Here, in the case of non-contact power supply, the power transmission environment may change due to some external factor during the standby state. For example, a foreign object, an animal, or the like may enter between the power feeding coil and the power receiving coil, and there is a possibility of changing to an environment where power transmission cannot be performed appropriately.

  However, according to the non-contact power transmission system 100 of the present embodiment, even when the charging start time has elapsed, the power transmission environment is determined again by performing precharging again, so that the power transmission environment can be used for power transmission. In this case, charging of the power storage device is started, so that charging can be performed more reliably.

  The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, in the present embodiment, after the charging start time has elapsed (S215), the process returns to step S201, the presence of a parked vehicle is confirmed (S201), the battery voltage is monitored (S202, S203), and the communication device search on the power feeding side (S204, S205). ), The connection request (S206, S207), and the precharge (S208, S209) are sequentially performed again, but the present invention is not limited to this. For example, after the charging start time elapses, the process may return to step S202 and start again from the battery voltage monitor, or may return to step S204 and start again from the communication device search on the power feeding side, or return to step S206 and connect. It may be performed again from the request, or may be performed again from the precharge by returning to step S208.

  In the present embodiment, the timer input device 30 is provided on the vehicle 20 side. However, the timer input device 30 may be provided on the non-contact power supply device 10 side.

  Further, in the present embodiment, during the precharge, the output power (current) information of the rectifier unit 22 is transmitted from the vehicle 20 side to the contactless power supply device 10 side, and the precharge OK or the Although the determination of NG and the determination of the power transmission environment are performed, the vehicle 20 may determine the precharge OK or NG and the determination of the power transmission environment. In this case, precharge output power (current) information is transmitted from the non-contact power feeding apparatus 10 side to the vehicle 20 side.

  In the present embodiment, the battery charge state information is transmitted from the vehicle 20 side to the non-contact power supply device 10 side, and the full charge state of the battery is determined on the non-contact power supply device 10 side. The battery may be fully charged.

  Moreover, in this embodiment, although the form which carries out pressure | voltage rise / fall to battery voltage equivalent was illustrated in the rectifier unit 22 by the side of the vehicle 20, it is not limited to this. For example, you may raise / lower pressure in the inverter unit 11 by the side of the non-contact electric power feeder 10. FIG.

  In the present embodiment, the battery voltage is exemplified as a parameter that correlates with the charge ratio with respect to the full charge of the battery. However, instead of the battery voltage, another parameter that correlates with the charge ratio with respect to the full charge of the battery can be used. It is. In this case, instead of the voltage sensor, the rectifier unit 22 has a sensor that monitors another parameter that correlates with the charging rate with respect to the full charge of the battery.

  Further, in the present embodiment, the fully correlated state or the state close to the fully charged state is determined by using the parameter correlated with the charging rate with respect to the fully charged state as it is, but the charging rate is calculated from this parameter, and the calculated charging rate is calculated. It may be used to determine a full charge state or a state close to full charge.

  In the present embodiment, the first predetermined value may be set by the user. Some users feel annoying that charging is performed automatically every time they park, but this annoyance can be alleviated.

  In the present embodiment, the power feeding coil unit 12 and the power receiving coil unit 21 each have a coil, and the power transmission is performed in a non-contact manner using electromagnetic induction, but the feature of the present invention is that The coil unit 12 and the power receiving coil unit 21 each have a resonance circuit composed of a coil and a capacitor, and can be applied to a form in which electric power is transmitted in a contactless manner using a resonance method.

  DESCRIPTION OF SYMBOLS 10 ... Non-contact electric power feeder, 11 ... Inverter unit, 12 ... Power feeding coil unit (power feeding coil), 13 ... Wireless communication part (wireless communication device for electric power feeding), 14 ... Parking detection sensor, 20 ... Vehicle, 21 ... Power receiving coil unit (Power receiving coil), 22 ... rectifier unit, 23 ... drive battery (power storage device), 24 ... rectifier relay, 25 ... battery monitoring unit, 26 ... power management ECU, 27 ... feed control ECU, 28 ... feed start switch, 29 ... wireless communication unit (power receiving wireless communication apparatus), 30 ... timer input device, 100 ... non-contact power transmission system.

Claims (4)

A non-contact power transmission system that performs non-contact power transmission from a non-contact power feeding device to a non-contact power receiving device,
The non-contact power feeding device is:
A wireless communication unit for feeding that performs wireless communication with the non-contact power receiving device;
In accordance with wireless communication by the wireless communication unit for power supply, a power supply coil for supplying power to the non-contact power receiving device using electromagnetic coupling,
With
The non-contact power receiving device is:
A power receiving wireless communication unit for performing wireless communication with the non-contact power supply device;
In response to wireless communication by the power receiving wireless communication unit, a power receiving coil for performing power acquisition from the non-contact power feeding device using electromagnetic coupling,
A rectifier unit that rectifies AC power from the power receiving coil and generates a DC voltage for charging the power storage device;
With
The non-contact power feeding device or the non-contact power receiving device further includes a timer input unit that presets a charging start time of the power storage device,
By performing precharge between the non-contact power feeding device and the non-contact power receiving device, the power transmission environment from the non-contact power feeding device to the non-contact power receiving device can be changed to the non-contact power feeding device or the non-contact power receiving device. When the power transmission environment is an environment capable of power transmission, the contactless power feeding device and the contactless power receiving device shift to a standby state,
After the charging start time elapses, the power transmission environment is determined again by the contactless power feeding device or the contactless power receiving device by performing re-precharge between the contactless power feeding device and the contactless power receiving device. When the power transmission environment is an environment capable of power transmission, the power storage device is charged by the contactless power feeding device and the contactless power receiving device.
Non-contact power transmission system. When the non-contact power receiving device changes the power transmission environment during the standby state, the non-contact power feeding device notifies the non-contact power feeding device to stop charging.
The contactless power transmission system according to claim 1. After the charging start time has elapsed and before performing the re-precharge, a connection request is made to the non-contact power feeding device by the power receiving wireless communication unit.
The contactless power transmission system according to claim 1. After the charging start time has elapsed and before performing the re-precharge, the wireless communication unit for power reception searches for the non-contact power feeding device.
The contactless power transmission system according to claim 1.

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