Method and diagnostic device for diagnosing a heatable exhaust gas sensor of an internal combustion engine

US9062623B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Cyril Verdier · Stuttgart, DE
• Stefan Klein · Meitingen, DE
• Gerhard Lemke · Eßlingen, DE
• Karsten Glashoff · Deizisau, DE
• Peter Brida · Lambach, DE
• Frank Meier · Goldkronach, DE
• Thomas Seiler · Stuttgart, DE

Key dates

• Filing date: Jun 30, 2010
• Grant date: Jun 23, 2015
• Expiry date: Jul 12, 2032

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02D41/266
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method is described for diagnosing a heatable exhaust gas sensor of an internal combustion engine, in which a predefined chronologically varying or constant voltage or a predefined chronologically varying or constant current is generated with the aid of a voltage source, the voltage or the current is applied to terminals of the exhaust gas sensor, a current or applied voltage, which flows through the voltage source when the voltage or the current is applied, is detected, and the current or the voltage is analyzed to diagnose the exhaust gas sensor. To diagnose the exhaust gas sensor, which permits a reliable and accurate diagnosis of the exhaust gas sensor and allows a statement about the type of a possibly existing error on the exhaust gas sensor, the method is executed independently of a control and/or regulating unit of the internal combustion engine, an operating temperature of the exhaust gas sensor being regulated to a predefined temperature value with the aid of a regulating element, which is separate from the control and/or regulating unit.