The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 04, 2002
Filed:
Jan. 13, 2000
Andrew Michael Voto, Swartz Creek, MI (US);
Ronald Kenneth Selby, Flint, MI (US);
Paul Thaddeus Glomski, Fenton, MI (US);
Maurice Lydell Dantzler, Carmel, IN (US);
Delphi Technologies, Inc., Troy, MI (US);
Abstract
An electronic compass system using information on a communications bus to eliminate magnetic noise which is integrated with an instrument cluster. A vehicle accessory, such as a blower motor, generates a known, consistent, magnetic field of intensity sufficient to cause a static magnetic offset in the electronic compass for each of its' electrical states. An electronic controller commands the vehicle accessory to change electrical states and transmits a vehicle event message on a communications bus. A magnetic field sensor detects a combination of Earth's magnetic field and the stray magnetic field produced by the vehicle accessory. A controller is coupled to the communications bus and uses the vehicle event message to look up a predetermined correction factor, corresponding to the electrical state, to eliminate the effect of the static magnetic offset. The controller then displays a heading unaffected by the static magnetic offset.