Patent · US Expired

Sensor

US4549430A · kind A · utility

4Cited by

10References

8Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Klaus Dobler · Gerlingen, DE
Rudolf Heinz · Renningen, DE
Ulrich Schoor · Stuttgart, DE
Thomas Frey · Friolzheim, DE

Key dates

Filing date	Apr 10, 1984
Grant date	Oct 29, 1985
Priority date	—
Expiry date	Apr 10, 2004

Classification

Technology area (CPC G)Physics
CPC primaryG01L23/22
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A conductor (5) which varies its resistance value under the influence of pressure is introduced into the combustion chamber of the engine. In one embodiment the conductor is a wire (5), a coil, a meander pattern or the like; preferably, one part (5a) of the wire arrangement is shielded from the pressure. The shielded (5a) and the unshielded (5b) parts of the wire arrangement then form the branches of a bridge circuit. The sensor is preferably disposed in the breathing room (11) of a spark plug or for a Diesel engine, combined with an electric conductor (21, 44) serving to provide pre-glowing in a glow plug. Combustion pressures are thus sensed for controlling and/or regulating injection systems and/or ignition systems without requiring additional bores.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.