Patent ID: 9739641
Date: 2017-08-22
CPC Classifications: B60L,G01D,H02J,Y02T

Claim:
1. A method for controlling stray electromagnetic fields for a vehicle with an inductive charging system including a stationary primary coil, a secondary coil mounted to the vehicle, and at least one alignment coil assembly including at least three assembly coils, each assembly coil having a longitudinal axis and oriented orthogonally to a plane defined by the longitudinal axes of two other assembly coils, said alignment coil assembly being arranged in the vicinity of said secondary coil, comprising the steps of: (a) providing sensors for detecting the voltage induced in each assembly coil by a magnetic field generated by the primary coil to determine the position of the primary coil relative to the position of the secondary coil; (b) providing feedback to the vehicle operator to guide the alignment of the secondary coil relative to the primary coil; (c) biasing the feedback so as to modify a shape and size of an alignment zone; and (d) directing the vehicle operator to position the secondary coil within the modified alignment zone so as to control the stray electromagnetic fields.