System and apparatus to determine the angular position, and speed of a rotating shaft, particularly crank shaft of an internal combustion engine

US4356447A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Gunter Honig · Ditzingen, DE
• Uwe Kiencke · Ludwigsburg, DE
• Rainer Bone · Leinfelden, DE

Key dates

• Filing date: Jul 10, 1980
• Grant date: Oct 26, 1982
• Expiry date: Jul 10, 2000

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02D41/0097
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

To positively allocate output signals from a transducer scanning marker elements arranged at a uniform distance from the center of a rotating disk, the markers are located around the circumference of the disk in accordance with a predetermined pattern, for example, uniformly distributed 30.degree. apart, or distributed with uniformly increasing relative distances, and an additional market element (33) and forming a reference marker is located in the zones between adjacent markers spaced from a neighboring marker element (21) of the plurality of marker elements by a distance which is substantially larger than the angular distance with respect to the marker element at the other side of the reference marker. The outputs from a pick-up sensor are evaluated by applying the outputs to two counters, counting a different clock rate, the count output of one of the counters being stored and compared with a subsequent count state of the other counter operating at a higher clock rate. If the second counter has not reached the previously stored count, a positive indication that the sense marker as the reference marker is obtained, permitting a comparator to switch over a transfer switch to rout…