The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 17, 2003
Filed:
Mar. 05, 2001
Ingolf Rupp, Ludwigsburg, DE;
Michael Lehner, Muehlacker, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
The invention relates to a device for detecting the reverse rotation of a rotating part of an internal combustion engine, having a crankshaft ( ) whose rotation, by means of a sensor ( ) and a detector disk ( ) which is connected to the crankshaft ( ) and has a reference mark ( ) and a multitude of similar angle marks ( ), are sent by the sensor ( ) to a control unit ( ) in the form of pulses, having a camshaft ( ) whose rotation is detected by means of an absolute angle detector ( ), wherein the output signal of the absolute angle detector ( ) steadily rises or falls within a period depending on the rotation direction of the camshaft . The output signal of the absolute angle detector ( ) is supplied to the control unit ( ) for processing. In order to detect reverse rotation of the internal combustion engine, three successive angle values &phgr;(k−2), &phgr;(k−1), &phgr;(k), are scanned from the output signal of the absolute angle detector ( ) and are compared to one another in an algorithm in such a way that in the event of a malfunction with reverse rotation, the equation: &phgr;(k)<&phgr;(k−1)<&phgr;(k−2) is true. If this condition is not fulfilled, no conclusion is drawn regarding reverse rotation.