Pressure transducer for determining the pressure in the combustion chamber of an internal combustion engine

US5095741A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Ingo Bartig · Berlin, DE
• Rainer Burkel · Le Chesnay, FR
• Hansjoachim Mamisch · Berlin, DE
• Winfried Moser · Ludwigsburg, DE

Key dates

• Filing date: Sep 7, 1990
• Grant date: Mar 17, 1992
• Expiry date: Sep 7, 2010

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S73/04
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

In a pressure transducer (11), the diaphragm (14) is fastened at the front side of the housing (10) facing the combustion chamber of an internal combustion engine by weld connections. The pressure acting on the diaphragm (14) is transmitted via the plunger (16) to a sensor block (18) including a plurality of piezoelectrically acting crystals (19, 20). The quartz disks (19, 20) are glued together with one another and with an intermediate electrode (21) as well as with the housing (10) of the pressure transducer (11) by a conducting glue. The plunger (14), the abutment (23) and the piezoelectrically acting crystals (19, 20) are connected in the housing (10) so that force transmission to the crystals (19, 20) occurs without mechanical pretensioning. The pressure transducer (11) is virtually free of dynamic temperature errors and enables a relatively exact determination of the pressure curve with respect to time in the combustion chamber of an internal combustion engine in long-term operation.