Electricity: measuring and testing – Magnetic – Displacement
Patent
1996-06-24
1998-10-20
Snow, Walter E.
Electricity: measuring and testing
Magnetic
Displacement
32420722, 32420725, 341 15, G01B 730, B62D 1502, G01D 5249
Patent
active
058251782
ABSTRACT:
The sensing device for determination of a steering wheel angle of a steering column of a vehicle includes a first coded disk which is read by a first group of receiving devices to form a fine code signal and which rotates at the same speed as the steering wheel. A second coded disk rotates with a fourth the speed of the first disk and has two or more pole change positions which are detected by a second group of receiving devices to form a gross code signal. Hall elements are used as receiving devices. Magnetically coded disks having a predetermined sequence of alternating North and South pole regions are used as the coded disks. These regions are distributed around the periphery of the disk and have different arc lengths. Hall switching devices are used as receivers which cooperate with the magnetic regions of the coded disks. An accurate angle position signal for the steering wheel is produced by a device for combining the fine and gross code signals produced by the Hall switching devices which includes a microcomputer .mu.C.
REFERENCES:
patent: 4792788 (1988-12-01), Kumar
patent: 5646523 (1997-07-01), Kaiser et al.
Abendroth Manfred
Hipp Ulrich
Robert & Bosch GmbH
Snow Walter E.
Striker Michael J.
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