Field neutralization during inductive charging

Patent metadata

Field	Value
Publication number	US-10069334-B2
Application number	US-201615177785-A
Country	US
Kind code	B2
Filing date	Jun 9, 2016
Priority date	Dec 9, 2013
Publication date	Sep 4, 2018
Grant date	Sep 4, 2018

Abstract

A device and a corresponding method are provided for reducing an electromagnetic field in a vehicle. A control unit for a vehicle is designed to determine one or more properties of an electromagnetic interference field. The control unit is further designed to incite an emission unit in the vehicle to emit an opposing field which reduces a strength of the interference field in a first zone around and/or in the vehicle.

First claim

What is claimed is:

1. A control unit for a vehicle, wherein the control unit is operatively configured to:
determine one or more properties of an electromagnetic interference field; and
cause a transmitting unit of the vehicle to emit an opposing field which reduces a field strength of the interference field in a first region around and/or in the vehicle;
wherein the control unit is operatively configured to determine the opposing field in such a way that a destructive interference results from a superimposition of the opposing field with the interference field in the first region.

2. The control unit as claimed in claim 1 , wherein:
the vehicle is designed to provide an access function,
the access function comprises an exchange of authentication signals between the vehicle and a vehicle-external authentication unit,
the transmitting unit is designed to transmit a signal to the authentication unit, and
the interference field interferes with one of the authentication signals.

3. The control unit as claimed in claim 2 , wherein the control unit is operatively configured to cause the transmitting unit to emit a superimposition of the opposing field and an authentication signal.

4. The control unit as claimed in claim 1 , wherein the one or more properties of the interference field comprise one or more of: a frequency of the interference field, and one or more field strength values of the interference field at corresponding one or more locations around and/or in the vehicle.

5. The control unit as claimed in claim 1 , wherein:
the one or more properties are predefined and are stored on a storage unit of the vehicle, and
the control unit is operatively configured to access the storage unit in order to determine the one or more properties of the interference field.

6. The control unit as claimed in claim 1 , wherein the vehicle comprises a charging coil which causes the electromagnetic interference field.

7. A control unit for a vehicle, wherein the control unit is operatively configured to:
determine one or more properties of an electromagnetic interference field;
cause a transmitting unit of the vehicle to emit an opposing field which reduces a field strength of the interference field in a first region around and/or in the vehicle; and
alter the opposing field in order to reduce the interference field in a second region around and/or in the vehicle,
wherein the second region comprises at least one location around and/or in the vehicle which is not contained in the first region.

8. The control unit as claimed in claim 1 , wherein:
the vehicle comprises a multiplicity of transmitting units at different locations of the vehicle, and
the control unit is operatively configured to cause the multiplicity of transmitting units to emit a corresponding multiplicity of opposing fields which reduce the field strength of the interference field in a corresponding multiplicity of regions.

9. A method for neutralizing an electromagnetic interference field in and/or around a vehicle, wherein the method comprises the acts of:
determining one or more properties of the interference field; and
emitting an opposing field which reduces a field strength of the interference field in a first region around and/or in the vehicle;
wherein the opposing field is determined in such a way that a destructive interference results from a superimposition of the opposing field with the interference field in the first region.

Assignees

• Bayerische Motoren Werke Ag

Inventors

• Barbul Andreas
• Wagatha Helmut
• Drozkowski Stefan

Classifications

• H01F27/38

  Auxiliary core members; Auxiliary coils or windings · CPC title

• Y02T90/14

  Plug-in electric vehicles · CPC title

• H01F38/14

  Inductive couplings {(for wireless supply or distribution of electric power using inductive coupling H02J50/10)} · CPC title

• B60L2270/147

  electro magnetic [EMI] · CPC title

• Y02T10/7072

  Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors · CPC title