Heated hot-film air-mass sensor

US7966877B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Erhard Renninger · Markgröningen, DE
• Gerhard Hueftle · Aspach, DE
• Joerg Brueckner · Gerlingen, DE
• Bernhard Opitz · Leonberg, DE
• Bernd Kuenzl · Schwieberdingen, DE
• Uwe Konzelmann · Asperg, DE
• Ulrich Wagner · Bernburg, DE
• Henning Marberg · Weil der Stadt, DE
• Christoph Gmelin · Stuttgart, DE
• Matthias Illian · Gerlingen, DE

Key dates

• Filing date: Feb 23, 2006
• Grant date: Jun 28, 2011
• Expiry date: Mar 14, 2027

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T29/4913
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

To determine air mass flows, especially for controlling internal combustion engines, a hot-film air-mass sensor is provided, which may be used especially for sensing air mass flows in the intake tract of an internal combustion engine. The hot-film air-mass sensor has a sensor chip having a sensor frame and a sensor diaphragm having at least one heating element and at least two temperature sensors. Furthermore, the hot-film air-mass sensor has a chip carrier for mounting the sensor chip, as well as at least one additional heating element. The sensor chip is able to be heated up using the at least one additional heating element, which is inserted into the chip carrier. Compared to the usual devices, the hot-film air-mass sensor has a lower susceptibility to contamination, especially by oil films.