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System and method for cancelling the effects of stray magnetic fields from the output of a variable reluctance sensor

United States Patent

November 19, 2002
View the Complete Patent at the US Patent & Trademark Office
National Renewable Energy Laboratory - Visit the NREL Technology Transfer Website
A sensor system for sensing a rotation of a sensing wheel is disclosed. The sensor system has a sensing coil in juxtaposition with the sensing wheel. Moreover, the sensing coil has a sensing coil output signal indicative of the rotational speed of the sensing wheel. Further, a cancellation coil is located remotely from the sensing coil and connected in series therewith. Additionally, the cancellation coil has a cancellation coil output signal indicative of an environmental disturbance which is effecting the sensing coil output signal. The cancellation coil output signal operates to cancel the effects of the environmental disturbance on the sensing coil output signal.
Chen; Chingchi (Ann Arbor, MI), Degner; Michael W. (Farmington Hills, MI)
Ford Global Technologies, Inc. (Dearborn, MI)
09/ 606,863
June 29, 2000
GOVERNMENT RIGHTS The U.S. Government may have certain rights in this invention as provided by the terms under NREL Subcontract No. ZCB-4-13032-02, Prime Contract No. DEAC36-83CH10093 awarded by the Department of Energy.