Global Patent Index - EP 1883825 A1

EP 1883825 A1 20080206 - SYSTEM FOR INTRINSICALLY SAFE DETECTION OF A WHEEL ROTATIONAL SPEED

Title (en)

SYSTEM FOR INTRINSICALLY SAFE DETECTION OF A WHEEL ROTATIONAL SPEED

Title (de)

ANORDNUNG ZUR EIGENSICHEREN RADDREHZAHLERFASSUNG

Title (fr)

SYSTEME DE DETECTION DE LA VITESSE DE ROTATION D'UNE ROUE A SECURITE INTRINSEQUE

Publication

EP 1883825 A1 20080206 (DE)

Application

EP 06755232 A 20060517

Priority

  • EP 2006062375 W 20060517
  • DE 102005022596 A 20050517

Abstract (en)

[origin: WO2006122945A1] The invention relates to a system for detecting the rotational speed of a wheel or another rotating body with a sensor (1, 6), in particular, an active sensor (1), coupled with an encoder (23) by means of a magnetic field, which rotates with the rotating body, in particular, for the automotive industry. If, on the known systems, the air gap between the sensor device (S1, S2) and the encoder (23) is too small, then flipping and thus a duplication of the measured rotational speed of the wheel can happen and lead to problems in safety devices of the vehicle, which need a correct indication of the wheel rotational speed for proper operation. The aim of said invention is to improve tolerance on the fitting position of the known systems. Said aim is achieved, whereby the use of two separate signal paths (S1, f1; S2, f2) is provided, which comprise sensor devices (S1, S2) with a different sensitivity. The signal paths (S1, f1; S2, f2) are embodied, so that a signal path (S1, f1) with the highest sensitivity is always available, so that, in the normal undisturbed case, minimal optical distortions of the encoder track (13) for maximal air gaps are obtained, while simultaneously a monitoring signal path (S2, f2) is always available, the sensitivity of which is such that flipping is safely avoided in all magnetic conditions.

IPC 8 full level

G01P 3/487 (2006.01); G01P 3/489 (2006.01)

CPC (source: EP KR US)

G01D 5/24438 (2013.01 - EP US); G01D 5/24461 (2013.01 - EP US); G01D 5/24476 (2013.01 - EP US); G01D 5/2451 (2013.01 - EP US); G01P 3/487 (2013.01 - EP KR US); G01P 3/489 (2013.01 - EP US); G01P 21/02 (2013.01 - EP US)

Citation (examination)

Designated contracting state (EPC)

DE FR

DOCDB simple family (publication)

DE 102005022596 A1 20061123; CN 101176002 A 20080507; CN 101176002 B 20101110; EP 1883825 A1 20080206; JP 2008541116 A 20081120; JP 4972086 B2 20120711; KR 101354735 B1 20140122; KR 20080007616 A 20080122; US 2012092000 A1 20120419; US 8698488 B2 20140415; WO 2006122945 A1 20061123

DOCDB simple family (application)

DE 102005022596 A 20050517; CN 200680017085 A 20060517; EP 06755232 A 20060517; EP 2006062375 W 20060517; JP 2008511698 A 20060517; KR 20077026808 A 20060517; US 92048006 A 20060517