Systems and methods for wireless vehicle power transfer and misalignment estimation

Patent metadata

Field	Value
Publication number	US-11505077-B2
Application number	US-202016885010-A
Country	US
Kind code	B2
Filing date	May 27, 2020
Priority date	May 27, 2020
Publication date	Nov 22, 2022
Grant date	Nov 22, 2022

Abstract

A vehicle including a power receiving pad for wirelessly receiving power, a plurality of magnetic sensors for measuring a magnetic field of a power transmitting pad and obtaining magnetic field data, one or more processors, and one or more memory modules are provided. The one or more memory modules include a computer-readable medium storing computer-readable instructions that, when executed by the one or more processors, cause the one or more processors to receive the magnetic field data from the plurality of magnetic sensors, and estimate a lateral misalignment of the power receiving pad with respect to a magnetic axis of the power transmitting pad. The magnetic sensors are arranged to detect at least an X-component and a Y-component of a magnetic field produced by a power transmitting pad.

First claim

What is claimed is:

1. A vehicle comprising:
a power receiving pad for wirelessly receiving power from a first power transmitting pad;
a plurality of magnetic sensors for measuring a magnetic field of a second power transmitting pad and obtaining magnetic field data;
one or more processors; and
one or more memory modules comprising a non-transitory computer-readable medium storing computer-readable instructions that, when executed by the one or more processors, cause the one or more processors to:
receive the magnetic field data from the plurality of magnetic sensors;
estimate a lateral misalignment of the power receiving pad with respect to a magnetic axis of the second power transmitting pad;
decrease power output of the first power transmitting pad at a forward end thereof at a first rate; and
increase power output of the second power transmitting pad at a rear end thereof at a second rate corresponding to the first rate, the forward end of the first power transmitting pad overlaps the rear end of the second power transmitting pad at an overlapping region to provide uniform power across the first power transmitting pad and the second power transmitting pad.

2. The vehicle of claim 1 , wherein the lateral misalignment is estimated by an artificial neural network.

3. The vehicle of claim 1 , wherein the vehicle includes at least three magnetic sensors located proximate a front end of the vehicle.

4. The vehicle of claim 3 , wherein the at least three magnetic sensors are arranged to detect an X-component and a Y-component of the magnetic field.

5. The vehicle of claim 1 , wherein the computer-readable instructions further cause the one or more processors to estimate a vertical offset between the power receiving pad and the second power transmitting pad.

6. The vehicle of claim 5 , further comprising a vehicle suspension configured to be adjusted based on the estimated vertical offset.

7. The vehicle of claim 1 , further comprising a display device for indicating the lateral misalignment.

8. A power transmitting system for dynamic power transfer comprising:
a plurality of power transmitting pads;
one or more processors; and
one or more memory modules comprising non-transitory computer readable medium storing computer-readable instructions that, when executed by the one or more processors, cause the one or more processors to:
receive magnetic field data detected by a plurality of magnetic sensors of a vehicle detecting a magnetic field of the plurality of power transmitting pads;
detect a position of the vehicle relative to the magnetic field;
sequentially activate the plurality of power transmitting pads based on the position of the vehicle relative to the magnetic field
decrease power output of a first power transmitting pad of the plurality of power transmitting pads at a forward end thereof at a first rate; and
increase power output of a second power transmitting pad of the plurality of power transmitting pads at a rear end thereof at a second rate corresponding to the first rate, the forward end of the first power transmitting pad overlaps the rear end of the second power transmitting pad at an overlapping region to provide uniform power across the first power transmitting pad and the second power transmitting pad.

9. The power transmitting system of claim 8 , wherein:
the plurality of power transmitting pads each switch from a misalignment estimation mode to a power transmitting mode,
the plurality of power transmitting pads generate the magnetic field received by the plurality of magnetic sensors of the vehicle when in the misalignment estimation mode, and
the plurality of power transmitting pads transmit power to a power receiving pad of the vehicle when in the power transmitting mode.

10. The power transmitting system of claim 9 , wherein the computer-readable instructions, when executed by the one or more processors, cause the one or more processors to estimate a speed of the vehicle.

11. The power transmitting system of claim 9 , wherein the plurality of power transmitting pads operates at a first frequency when in the misalignment estimation mode and operates at a second frequency when in the power transmitting mode, the first frequency being different from the second frequency.

12. The power transmitting system of claim 8 , wherein the computer-readable instructions, when executed by the one or more processors, cause the one or more processors to adjust a magnitude of the magnetic field of the plurality of power transmitting pads based on an estimated vertical offset between a power receiving pad and the plurality of power transmitting pads.

13. A method for providing dynamic wireless power transfer to a vehicle, the method comprising:
wirelessly receiving power at a power receiving pad of a vehicle from a first power transmitting pad and a second power transmitting pad of a plurality of power transmitting pads;
detecting, using a plurality of magnetic sensors, a magnetic field provided by each of the plurality of power transmitting pads to obtain magnetic field data;
estimating a lateral misalignment of the power receiving pad with respect to a magnetic axis of the plurality of power transmitting pads using the magnetic field;
adjusting a position of the vehicle to account for the lateral misalignment of the power receiving pad;
decreasing power output of a first power transmitting pad of the plurality of power transmitting pads at a forward end thereof at a first rate; and
increasing power output of a second power transmitting pad of the plurality of power transmitting pads at a rear end thereof at a second rate corresponding to the first rate,
wherein the forward end of the first power transmitting pad overlaps the rear end of the second power transmitting pad at an overlapping region to provide uniform power across the first power transmitting pad and the second power transmitting pad.

14. The method of claim 13 , further comprising estimating a vertical offset of the power receiving pad with respect to the plurality of power transmitting pads using the magnetic field.

15. The method of claim 14 , further comprising instructing the vehicle to adjust a suspension of the vehicle based on the estimated vertical offset.

16. The method of claim 14 , further comprising instructing the plurality of power transmitting pads to adjust a magnitude of the magnetic field based on the estimated vertical offset.

17. The method of claim 13 , further comprising:
switching operation of each of the plurality of power transmitting pads from a misalignment estimation mode to a power transmitting mode;
estimating vehicle misalignment when in the misalignment estimation mode; and
transmitting power to the power receiving pad of the vehicle when in the power transmitting mode.

Assignees

• Toyota Eng & Mfg North America
• Univ Utah State

Inventors

• Pantic Zeljko
• Tavakoli Seyed Mohammad Reza
• Chou Chungchih
• Dede Ercan Mehmet

Classifications

• H02J2105/37

  exchanging power with electric vehicles [EV] or with hybrid electric vehicles [HEV] · CPC title

• H02J50/12

  of the resonant type · CPC title

• B60L53/36

  by positioning the vehicle · CPC title

• H02J50/90

  involving detection or optimisation of position, e.g. alignment · CPC title

• B60L53/12

  Inductive energy transfer · CPC title