Patent · US Expired

Optical combustion sensor, particularly for use with internal combustion engines

US4412446A · kind A · utility

5Cited by

2References

19Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Ernst Linder · Mühlacker, DE
Helmut Maurer · Rodenbach, DE
Klaus Muller · Tamm, DE
Helmut Reum · Stuttgart, DE

Key dates

Filing date	Feb 1, 1982
Grant date	Nov 1, 1983
Priority date	—
Expiry date	Feb 1, 2002

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF02B1/04
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

To provide for improved cleaning of an optical combustion sensor, particularly to determine knocking in an internal combustion (IC) engine, a pick-up element made of glass, glass-coated or covered metal or the like, and, for example, hollow inside and filled with a vaporizable and condensable medium to define a heat pipe, has a sensing end portion which is formed with a mushroom-shaped enlarged head (14). The unit may be combined with the functions of a spark plug by extending a conductor therethrough, making the pick-up of electrically conductive glass or ceramic, placing a metal foil or other conductor at the outside, separated from the metallic housing by an insulating sleeve or the like.

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