Arrangement for measuring a torque acting on a steering shaft of a motor vehicle and method for checking the arrangement

US12025520B2 · kind B2 · utility

Assignee

• Schaeffler Technologies AG & Co. KG · DE

Inventors

• Stephan Neuschaefer-Rube · Herzogenaurach, DE
• Thomas Lindenmayr · Nuremberg, DE
• Bernd Wittmann · Pommersfelden, DE

Key dates

• Filing date: Apr 29, 2020
• Grant date: Jul 2, 2024
• Expiry date: Mar 11, 2041

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R33/091
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method test an arrangement for measuring a torque acting on a steering shaft of a motor vehicle. The measurement is carried out using the inverse magnetostrictive effect. The steering shaft has an axis and at least two magnetization areas extending circumferentially around the axis. The arrangement comprises at least four magnetic field sensors for measuring an axial component of a magnetic field caused by the magnetization as well as by the torque. There are at least two combinations of at least two of the magnetic field sensors each, each of which is sufficient to measure the torque. First and second measurement values of the torque are determined with first and second combinations of the magnetic field sensors. The first measurement value and the second measurement value are compared, as a result of which a malfunction of the arrangement can be recognized.