Method and apparatus for calibrating a vehicle compass system

Details Method and apparatus for calibrating a vehicle compass system Method and apparatus for calibrating a vehicle compass system

1993-05-07

1995-02-14

Teska, Kevin J.

Boots, shoes, and leggings

36457101, 36457105, 33356, 73 1E, G01C 1738, G01C 2500

Patent

active

053901223

ABSTRACT:
A vehicle compass system that is adapted to be calibrated in the assembly plant during final assembly of the vehicle. In particular, two factory calibration modes are disclosed: an automatic factory calibration mode wherein the calibration sequence is automatically initiated upon the occurrence of a uniquely definable event on the assembly line, and a manual factor calibration mode wherein a calibration button sequence is actuated at a specified location on the assembly line. In addition, an automatic adaptive calibration process is disclosed which continuously updates the calibration constants each time valid new heading data is obtained. In particular, heading vectors for the four main N, S, E, and W heading directions are calculated and stored in memory when the system is initially calibrated. Thereafter, whenever new heading direction data is obtained, the value of the new heading vector is used to update the value of the closest of the four main heading vectors. A new center calculation is also performed using the updated values and if the result is outside a tolerance window, the calibration constants are changed accordingly.

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