Piezocryst Advanced Sensorics Gmbh

Avb List Gmbh

Gernot Leuprecht

Josef Glaser

Christian Reiter

Dietmar Kroeger

A sensor element () has at least one measurement element () with piezoelectric and pyroelectric properties, and measurement electrodes (). A measurement variable and a disturbance variable act simultaneously upon the at least one measurement element () and the measurement signal derived from the measurement electrodes () includes an interference signal. The sensor element () has at least one compensation element (') upon which only the disturbance variable acts, so that a correction signal used to compensate for the interference signal in the measurement signal can be derived from the compensation element (). The invention consists in that the compensation element (&#x2032;) is in thermal contact with a first support () and with a second support () of the measurement element (), or with the measurement element (), over its length between the supports (), so that substantially the same temperature field is established in the measurement element () and in the compensation element (&#x2032;).

Sensor element having at least one measurement element with piezoelectric and pyroelectric properties

In a spark plug, whose shell is provided with an eccentrically positioned, full-length, longitudinal bore designed to hold an insulating element, parts of the shell having varying wall thicknesses and a pressure measuring device being located in a part of greater wall thickness. In order to simplify connection with the ignition cable or coil, respectively, and to avoid breakage of the insulator, the spark plug insulator is configured as a multi-piece element and comprise at least an upper piece carrying the high voltage connector, a lower piece adjacent to the combustion chamber, and an insulating intermediate element of flexible material, which is placed between the upper and the lower piece of the insulator.

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St. Radegund-Rinnegg, Austria

Gernot Leuprecht