Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Vehicle subsystem or accessory control
Patent
1998-04-24
2000-06-27
Nguyen, Tan
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
Vehicle subsystem or accessory control
2808011, 32420721, B60R 2200
Patent
active
060817593
ABSTRACT:
A sensor of Giant magneto-resistive (GMR) type is attached to a seat belt anchor bracket. A seat belt passes through an opening in the bracket and is doubled back and sewn to form a loop. A magnet positioned on a sliding carriage is biased away from the sensor by springs. A seat belt loops around the carriage, and when tension is applied to the belt, the carriage with the magnet is drawn against the springs toward the GMR sensor. The GMR sensor measures the magnetic field present at the sensor and a microprocessor determines belt tension based on the known spring constants and the strength of measured magnetic field which is correlated with displacement of the magnet.
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Magnetic Field Sensors for Magnetic Position Sensing in Automotive Applications; GM R & D--8651; Joseph P. Heremans, Physics & Physical Chemistry Dept.
Husby Harald Snorre
Simpson Leonard
Breed Automotive Technology Inc.
Drayer Lonnie R.
Nguyen Tan
Stiennon Patrick
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