Oscillation sensor, particularly combustion engine knock sensor

US4275586A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Theodor Gast · Berlin, DE
• Kurt Binder · Stuttgart, DE

Key dates

• Filing date: Jan 16, 1979
• Grant date: Jun 30, 1981
• Expiry date: Jan 16, 1999

Classification

• Technology area (CPC G): Physics
• CPC primary: G01H11/08
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

In order to detect the occurrence of engine knock (pinging, detonation), a piezoelectric sensor is mounted on the engine in a location where the oscillations due to engine knock are readily transmitted. The detector is a strip or strips of piezoelectric material mounted in cantilevered configuration in a clamping device. An advantageous location for the sensor is a bore within one of the cylinder head bolts of the engine. A variety of embodiments is described including the provision of seals for permitting the introduction of a damping fluid in the receiver bore for the sensor.