Data processing: measuring – calibrating – or testing – Calibration or correction system – Position measurement
Patent
1997-06-18
1999-03-30
Barlow, John
Data processing: measuring, calibrating, or testing
Calibration or correction system
Position measurement
702 92, 702 93, 701307, 701224, G06F 1500
Patent
active
058900993
ABSTRACT:
The apparatus for determining turning rate, particularly of a motor vehicle, includes two sensor systems (1,3), each of which generate at least one output signal depending on the turning rate. The sensor signals from both sensor systems are combined by a microcontroller including a memory to determine the turning rate accounting for offset drift and sensitivity drift. The first sensor system (1) includes an electronic compass with at least two sensor components (10) each including at least one magnetoresistive element (19) arranged in a Wheatstone bridge for detecting an X-component, a Y-component or a Z-component of the earth's magnetic field. The second sensor system (3) generates a sensor signal according to a Coriolis force experience by an oscillating structure. Each sensor component (10) of the first sensor system also includes an integrated field compensation coil (L.sub.F) and a set/reset coil (L.sub.C) located next to the Wheatstone bridge, a preamplifier (12) with offset compensation connected across the Wheatstone bridge (11), a flip source connected to the field compensation coil, a demodulator receiving output signals from the preamplifier and a current controller connected to the set/reset coil and demodulator.
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Barlow John
Bui Bryan
Robert & Bosch GmbH
Striker Michael J.
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