Method and device for the self-diagnosis of a particle sensor

US8794046B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Sabine Roesch · Ditzingen, DE
• Benjamin Gaertner · Neureut, DE
• Johannes Grabis · Renningen, DE
• Alexander Hetznecker · Karlsruhe, DE
• Thorsten Ochs · Schwieberdingen, DE
• Henrik Schittenhelm · Stuttgart, DE

Key dates

• Filing date: Aug 5, 2010
• Grant date: Aug 5, 2014
• Expiry date: Jul 2, 2032

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/40
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

Self-diagnosis of a particle sensor may be used for determining a particle content in a gaseous stream. The particle sensor may include at least two interlocking, interdigital electrodes and a heating element. The heating element may be separated from the electrodes by an insulation layer. The particle sensor may be heated in a regeneration phase and a soot load on the particle sensor can thereby be removed. A semiconductive layer may be formed in the insulation layer directly beneath the electrodes by means of external doping or auto-doping. To perform a self-diagnosis, a measurement voltage may be applied at least periodically between the electrodes and a self-diagnostic current may be measured.