Combustion condition sensor

US4452072A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Eckart Damson · Stuttgart, DE
• Winfried Moser · Ludwigsburg, DE
• Franz Rieger · Aalen, DE

Key dates

• Filing date: Aug 23, 1982
• Grant date: Jun 5, 1984
• Expiry date: Aug 23, 2002

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01T13/48
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

To protect the light guide element of a combustion sensor, for example combined with a spark plug, and extending through a bore in the center electrode thereof against high temperatures and attach due to environmental conditions occurring within the combustion chamber, a protective element of a high temperature resistant, light transmitting ceramic, preferably alpha-crystalline aluminum oxide is located at the combustion end portion, for example in form of a disc 14, held in position by a turned-over flange of the end portion of the center electrode 13 of a spark plug-sensor combination.