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:
Jul. 08, 2003
Filed:
Aug. 27, 2001
Juergen Sauler, Stuttgart, DE;
Axel Heinstein, Wimsheim, DE;
Carsten Kluth, Stuttgart, DE;
Werner Haeming, Neudenau, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
In the diagnostic method for detecting erroneous operation of a knock sensor of an internal combustion engine an actual reference level is formed from knock sensor signals generated by the knock sensor; then two minimum knock detection thresholds consisting of rotation speed values are defined and compared with rotation speed to test whether or not rotation speed exceeds each minimum knock detection threshold; the reference level is then compared with at least one of an upper reference level threshold and a lower reference level threshold, but only with the upper reference level threshold when a lower minimum knock detection threshold is exceeded, and a diagnostic signal indicative of a knock sensor fault or error is generated when the reference level exceeds the upper reference level threshold or falls below the lower reference level threshold, if and only if engine rotation speed exceeds at least one of the minimum knock detection thresholds.