Optical combustion event sensor structure particularly knock sensor for an internal combustion engine

US4446723A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Bernward Boning · Ludwigsburg, DE
• Rainer Bone · Leinfelden, DE
• Rudolf Nagel · Asperg, DE
• Franz Sellmaier · Schwieberdingen, DE
• Helmut Reum · Stuttgart, DE

Key dates

• Filing date: Feb 1, 1982
• Grant date: May 8, 1984
• Expiry date: Feb 1, 2002

Classification

• Technology area (CPC G): Physics
• CPC primary: G01J5/046
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A light guide element, secured in a spark plug-like housing and positioned, for example, within a metallic tube forming a spark plug connector, is coated at the end facing the combustion chamber with a light-impervious material viz: graphite, the graphite emitting radiation upon influence of heat arising within the combustion chamber, which radiation is transmitted to the optical pick-up for subsequent photo-electric evaluation thereof. The optical pick-up is, for example, a quartz glass rod coupled to a light guide cable, or directly coupled to an opto-electrical transducer.