Method for checking the functional capability of a nitrogen oxide sensor

US10627382B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Eckehard Knoefler · Erbach, DE
• Torsten Handler · Stuttgart, DE

Key dates

• Filing date: Jan 16, 2018
• Grant date: Apr 21, 2020
• Expiry date: May 17, 2038

Classification

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

Abstract

A method is presented for checking the functional capability of a nitrogen oxide sensor (10) which has a first chamber (12) and a second chamber (14), wherein the first chamber has a first oxygen pump cell (20) and the second chamber has a second pump cell (34), in a normal operating mode of the nitrogen oxide sensor (10), an oxygen concentration level in the first chamber is reduced to a predetermined first value with the first pump cell, and an oxygen concentration level in the second chamber is reduced to a second value with the second pump cell, said second value being lower than the first value.