Sensor including hall element, movable magnetic body and permanent magnet for automatically triggering safety devices in motor vehicles

US5359286A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Harry Kaiser · Heidelberg, DE
• Manfred Abendroth · Marbach am Neckar, DE

Key dates

• Filing date: Jun 19, 1992
• Grant date: Oct 25, 1994
• Expiry date: Jun 19, 2012

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S73/03
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A sensor for automatically triggering safety devices in motor vehicles has a housing a having a recess, a body arranged in the housing so as to serve as a seismic mass and to trigger a control signal when a predetermined threshold value is exceeded, a permanent magnet enclosed by a region of magnetically nonconductive material, a Hall element arranged in the body in working connection with the permanent magnet and comprising magnetically conducting material. The Hall element substantially evaluates magnetic flux lines running parallel to a polarization direction of the permanent magnet, so that the Hall element evaluates the magnetic flux lines running parallel to the polarization direction of the permanent magnet in a basic position, and evaluates the magnetic flux lines running in an opposite direction in a tilting position.