Patent · US Expired

Piezoelectric engine-knock sensor

US4379404A · kind A · utility

5Cited by

3References

8Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Hans-Joachim Hamisch · Berlin, DE
Manfred Boruschweitz · Berlin, DE
Theodor Gast · Berlin, DE

Key dates

Filing date	Feb 23, 1981
Grant date	Apr 12, 1983
Priority date	—
Expiry date	Feb 23, 2001

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF02B1/04
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A metallic reed clamped against a piezoelectric element, and free to oscillate at its other end, generates electrical signals in a piezoelectric element which is held between clamp surfaces in fixed relation to an engine part which transmits engine knock vibrations to the sensor assembly. The reed is oriented perpendicular to the vibratory motions of the engine part on which it is mounted, so that vibrations of the reed will be excited thereby, and these will deform the piezoelectric element to generate signals. The entire assembly can be enclosed in a transverse bore in the head of a cylinder head screw.

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