Device for determining angular position of a rotating part

US4715009A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Heinz Bohmler · Pleidelsheim, DE
• Rolf Daumer · Laichingen, DE
• Dieter Mayer · Ludwigshafen, DE
• Egbert Perenthaler · Stuttgart, DE

Key dates

• Filing date: Nov 12, 1985
• Grant date: Dec 22, 1987
• Expiry date: Nov 12, 2005

Classification

• Technology area (CPC G): Physics
• CPC primary: G01P3/489
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A device for picking up the position of an angle of a rotating part which is provided with angle markers 11 or teeth being simultaneously distributed over its circumference, whereby at least one angle marker and/or intermediate space between two angle markers is shaped differently serving as a reference marker 12. This can be realized, for example, by a wide or smaller angle marker or gap between two angle markers. The distance between two angle marker flanks is picked up by a counter 17 which counts a cycle frequency, whereby the counter is a free running continously counting counter. The instantaneously present counter level is transmitted into a storage 18 for each angle marker flank (ascending flank or rear flank) to be evaluated. Subtractions of two successive storage values and comparisons of successive corresponding differential values are performed for recognizing a reference marker. A reference marker signal is generated during a deviation of a differential value by a predetermined dimension from the established differential value, preferably before or after.