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:
Mar. 21, 1995
Filed:
Jun. 11, 1993
Robert Entenmann, Benningen, DE;
Joerg Bonitz, Muehlacker, DE;
Stefan Unland, Schwieberdingen, DE;
Romuald Fries, Ditzingen-Heimerdingen, DE;
Robert Sloboda, Markgroeningen, DE;
Klaus Schenk, Bietigheim-Bissingen, DE;
Karl Dums, Renninger-Malmsheim, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
A knock sensor for indirect or direct fixing to an internal combustion engine has a housing (10) with a pressure sleeve (11) on the outer side of which a piezoceramic disk, a seismic mass (16), the contact disks (14), and the insulating disks (13) are arranged. The insulating disks (13) or the piezoelectrical disk (15) are or is made slightly electrically conductive so that the voltage spikes which occur due to the pyroelectrical effect can be easily eliminated. In this way, faulty measuring and interference can be avoided in the electrical circuit connected to the knock sensor.