Method and device for adapting signals of an oxygen sensor in the air supply channel of an internal combustion engine

US8893546B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Richard Holberg · Stuttgart, DE
• Christian Reichert · Weingarten, DE

Key dates

• Filing date: Feb 7, 2013
• Grant date: Nov 25, 2014
• Expiry date: May 27, 2033

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/40
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A method/device for evaluating oxygen sensor signals of an air supply channel connected to an exhaust gas channel of the internal combustion engine, via an exhaust gas recirculation having at least one exhaust gas recirculation valve; the oxygen sensor being downstream from the exhaust gas recirculation initiation; the sensor signal(s) being corrected as a function of at least one characteristics variable describing the dependence of the sensor signal on the oxygen concentration or a correlated variable, and/or additional physical variables. At at least one engine operating point(s), in response to a closed exhaust gas recirculation valve, output oxygen sensor signals and additional operating point parameters are recorded/stored; and an adaptation of the characteristic variables is derived assuming that the gas composition corresponds to pure air. Also, a characteristics curve adjustment and a compensation of pressure temperature dependencies may be performed to improve the accuracy of the oxygen sensor signals.