US 12,411,151 B2
Omnidirectional rotational speed and rotational direction sensor
Christian Huber, Ludwigsburg (DE); and Michael Hauff, Munich (DE)
Assigned to KNORR-BREMSE SYSTEME FUER NUTZFAHRZEUGE GMBH, Munich (DE)
Appl. No. 18/000,277
Filed by Knorr-Bremse Systeme Fuer Nutzfahrzeuge GmbH, Munich (DE)
PCT Filed Jun. 25, 2021, PCT No. PCT/EP2021/067537
§ 371(c)(1), (2) Date Nov. 29, 2022,
PCT Pub. No. WO2022/008265, PCT Pub. Date Jan. 13, 2022.
Claims priority of application No. 10 2020 117 752.6 (DE), filed on Jul. 6, 2020.
Prior Publication US 2023/0258684 A1, Aug. 17, 2023
Int. Cl. G01P 3/487 (2006.01); G01P 1/02 (2006.01); G01P 13/04 (2006.01)
CPC G01P 3/487 (2013.01) [G01P 1/026 (2013.01); G01P 13/045 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A magnetic field sensor, comprising:
a chip having at least a first, a second, and a third magnetic field measuring element, which are configured to output a first, a second, and a third magnetic field signal respectively, amplitudes of which are proportional to a magnetic field emanating from a rotating object, wherein directions of normal vectors of the first, the second, and the third magnetic field measuring elements are linearly independent of each other, wherein the first measuring element is a lateral Hall sensor, and the second and the third measuring elements are vertical Hall sensors, and wherein the normal vectors of the first, the second, and the third magnetic field measuring elements are at an angle of 90° relative to one another;
a signal acquisition unit to determine a first differential signal and a second differential signal, wherein the first differential signal is based on a difference between the first magnetic field signal of the first magnetic field measuring element and the second magnetic field signal of the second magnetic field measuring element, and wherein the second differential signal is based on a difference between the first magnetic field signal of the first magnetic field measuring element and the third magnet field signal of the third magnetic field measuring element, and wherein the signal acquisition unit is further configured to determine a combined signal from the first magnetic field signal of the first magnetic field measuring element and the first differential signal and second differential signal; and
an evaluation unit to generate an output signal, which contains a speed of motion and a direction of motion of the rotating object.