Abstract: At least one time-varying signal is applied to a plurality of coil elements in cooperative relationship with and spanning different portions of a vehicle. The coil elements generate an associated plurality of magnetic field components that interact with the vehicle. At least one detection circuit generates a detected signal responsive to signal components from the coil elements so as to provide for detecting a change in a magnetic condition of the vehicle.
Type:
Grant
Filed:
July 29, 2006
Date of Patent:
June 17, 2008
Assignee:
Automotive Systems Laboratory Systems, Inc.
Inventors:
Leonard S. Cech, W. Todd Watson, Hiroshi Aoki, Dana A. Stonebrook