Vehicle and power transmission/reception system

• US 9,381,878 B2
• Filed: 06/03/2011
• Issued: 07/05/2016
• Est. Priority Date: 06/03/2011
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Ichikawa, Shinji
• Primary Examiner(s): Doan, Nghia
• Application Number:
  US14/118,978
• Publication Number:
  US 20140077760A1
• Time in Patent Office: 1,859 Days
• Field of Search: 320/104, 320/108
• US Class Current: 1/1
• CPC Class Codes: B60L 1/006 to power outlets
• CPC Class Codes: B60L 53/126 Methods for pairing a vehicle and a charging station, e.g. establishing a one-to-one relation between a wireless power transmitter and a wireless power receiver
• CPC Class Codes: B60L 53/36 by positioning the vehicle
• CPC Class Codes: B60R 16/03 for supply of electrical power to vehicle subsystems or for circuit arrangements for charging batteries H02J7/00
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
• CPC Class Codes: H02J 50/90 involving detection or optimisation of position, e.g. alignment
• CPC Class Codes: H02J 7/00034 Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 90/12 Electric charging stations
• CPC Class Codes: Y02T 90/14 Plug-in electric vehicles

Abstract

A vehicle includes a power reception unit for receiving electric power in a non-contact manner by electromagnetic field resonance, and a device power feeding unit for transmitting electric power to be supplied to an in-vehicle electrical device in a non-contact manner by electromagnetic induction. A distance over which the electric power is transmitted from an external power transmission unit to the power reception unit in a non-contact manner is longer than a distance over which the electric power is transmitted from the device power feeding unit to the in-vehicle electrical device in a non-contact manner. The vehicle further includes a main battery for supplying electric power to a motor generator, and an auxiliary battery. The auxiliary battery has a voltage lower than a voltage of the main battery. The device power feeding unit receives electric power from the auxiliary battery and transmits the power to the in-vehicle electrical device.

Claims

1. A vehicle comprising:

a main battery;

a converter connected to the main battery;

an inverter connected to the converter and a rotational electric machine;

a first relay provided between the main battery and the converter;

a power reception device that receives electric power for running of the vehicle in a non-contact manner by electromagnetic field resonance;

a second relay provided between the main battery and the power reception device;

a power transmission device that transmits electric power to be supplied to an in-vehicle electrical device in a non-contact manner by electromagnetic induction, the power transmission device being configured to receive electric power from the main battery via the first relay; and

a control unit that;

switches between ON/OFF states of the first relay and ON/OFF states of the second relay;

prohibits power supply from the power transmission device to the in-vehicle electrical device when the power reception device can receive electric power with the first relay being OFF and the second relay being ON;

prohibits power supply from the power transmission device to the in-vehicle electrical device when the power reception device is prohibited from receiving electric power with the first relay being OFF and the second relay being OFF; and

allows power supply from the power transmission device to the in-vehicle electrical device when the first relay is ON.

2. The vehicle according to claim 1, wherein:

the electric power received by the power reception device from an external power transmission apparatus installed outside of the vehicle in a non-contact manner is larger than the electric power transmitted from the power transmission device to the in-vehicle electrical device in a non-contact manner.

3. The vehicle according to claim 2, wherein:

a distance over which the electric power is transmitted from the external power transmission apparatus installed outside of the vehicle to the power reception device in a non-contact manner is longer than a distance over which the electric power is transmitted from the power transmission device to the in-vehicle electrical device in a non-contact manner.

4. The vehicle according to claim 3, further comprising:

an auxiliary battery provided separately from the main battery and that receives electric power form the main battery via the first relay,

the auxiliary battery having a voltage lower than a voltage of the main battery;

wherein the power transmission device receives electric power from the auxiliary battery and transmits the power to the in-vehicle electrical device.

5. The vehicle according to claim 4, wherein the control unit:

sets an operation state of the vehicle to a drivable state and a non-drivable state in accordance with operation by an occupant;

in the drivable state;

allows charging of the main battery with the electric power received by the power reception device; and

allows power supply from the power transmission device to the in-vehicle electrical device; and

in the non-drivable state;

allows charging of the main battery with the electric power received by the power reception device; and

prohibits power supply from the power transmission device to the in-vehicle electrical device.

6. The vehicle according to claim 1, wherein:

position adjustment between the power reception device and the external power transmission apparatus installed outside of the vehicle is performed by movement of the vehicle; and

position adjustment between the in-vehicle electrical device and the power transmission device is performed by placement of the in-vehicle electrical device in a predetermined position relative to the power transmission device by an occupant.

7. The vehicle according to claim 6, wherein:

the power transmission device includes a device placement surface, which is not in electrical contact with the in-vehicle electrical device and on which the in-vehicle electrical device is placed.

8. A power transmission/reception system comprising:

a power transmission apparatus outside of a vehicle for transmitting electric power to the vehicle in a non-contact manner by electromagnetic field resonance;

an in-vehicle electrical device used in the vehicle; and

the vehicle, comprising;

a battery;

a converter connected to the battery;

an inverter connected to the converter and a rotational electric machine;

a first relay provided between the battery and the converter;

a power reception device that receives electric power for running of the vehicle from the power transmission apparatus outside of the vehicle in a non-contact manner by electromagnetic field resonance;

a second relay provided between the battery and the power reception device;

a power transmission device that transmits electric power to be supplied to the in-vehicle electrical device in a non-contact manner by electromagnetic induction, the power transmission device being configured to receive electric power from the battery via the first relay; and

a control unit that;

switches between ON/OFF states of the first relay and ON/OFF states of the second relay;

prohibits power supply from the power transmission device to the in-vehicle electrical device when the power reception device can receive electric power with the first relay being OFF and the second relay being ON;

prohibits power supply from the power transmission device to the in-vehicle electrical device when the power reception device is prohibited from receiving electric power with the first relay being OFF and the second relay being OFF; and

allows power supply from the power transmission device to the in-vehicle electrical device when the first relay is ON.