Device for determining a motion parameter with automatic scaling factor correction

US5987984A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Johannes Artzner · Eningen unter Achalm, DE
• Wolfram Bauer · Lörrach, DE

Key dates

• Filing date: Mar 11, 1998
• Grant date: Nov 23, 1999
• Expiry date: Mar 11, 2018

Classification

• Technology area (CPC G): Physics
• CPC primary: G01D18/00
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A device which determines a motion parameter with a sensor having a plurality of sensor elements coupled to one another, in which the motion parameter corresponds to a rotational speed. The device includes a starter loop for putting the sensor in a state of excitation via a starter signal via at least one of the sensor elements and for generating a sensor quantity, with the sensor quantity being a measure of a response of the sensor to the starter signal, and the starter signal having a substantially constant amplitude. A detector loop coupled to at least one of the sensor elements is also provided in the device for providing a measurement signal correlating with the motion parameter. The device further includes an analysis unit for providing an output voltage representing the motion parameter as a function of the measurement signal, a correction unit for keeping a substantially constant correlation between the output voltage and the motion parameter and for generating a correction signal as a function of the sensor quantity, and a multiplier providing the correction signal to the analysis unit.