Contactless measurement device for determination of angular position of a shaft, particularly an engine cam shaft, enables position to be precisely known from the time at which the engine is switched on

• Main Authors: HAAS, GUNTHER, GROTHE, WOLFGANG, SIEGLE, HENRIK
• Format: Patent
• Language: English; German
• Published: 30.08.2001
• Edition: 7
• Subjects: ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVEREDIN A SINGLE OTHER SUBCLASS; MEASURING; MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR; PHYSICS; TARIFF METERING APPARATUS; TESTING

Measurement device (1) comprises a permanent magnet (2) arranged above a magnetic sensor element (3). The latter is arranged in the vicinity of a signal generator wheel (4) with a number of teeth and holes on its outer surface. The field of the permanent magnet is directed along a radius of the generator wheel. Typically the magnetically sensitive element is of AMR or GMR material and the analysis circuit is a Wheatstone's bridge circuit. Die vorliegende Erfindung betrifft eine Messvorrichtung (1) zur berührungslosen Erfassung der momentanen Drehstellung einer Welle, umfassend einen Permanentmagneten (2) und ein magnetfeldempfindliches Element (3). Die Welle weist ein ferromagnetisches Geberrad (4) auf. Dem ferromagnetischen Geberrad (4) gegenüberliegend ist das magnetfeldempfindliche Element (3) positioniert. Schließlich ist der Permanentmagnet (2) auf der Rückseite des magnetfeldempfindlichen Elements (3) angeordnet.