Diagnostic method for an internal combustion engine exhaust gas system that includes a particle filter

US8096171B2 · kind B2 · utility

Assignees

• Daimler AG · DE
• Conti Temic microelectronic GmbH · DE

Inventors

• Joachim Konrad · Goldkronach, DE
• Yi Liu · Columbus, US
• Emmanuel Routier · Stuttgart, DE
• Kevin Sisken · Saline, US
• Patrick Wolf · Traunreut, DE
• Peter Schimmelpfennig · Erlangen, DE

Key dates

• Filing date: Nov 5, 2009
• Grant date: Jan 17, 2012
• Expiry date: Aug 27, 2030

Classification

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

Abstract

In a method for the diagnostics of an internal combustion engine exhaust gas system that includes a particle filter, first and second sets of value vectors are determined, each including associated values for absolute pressure upstream and downstream of the particle filter, a differential pressure determined from the values of the absolute pressure, an exhaust gas volume flow through the particle filter, and a temperature of the exhaust gas volume flow. After a temperature-standardization of the pressure values, characteristics for dependence of the pressure values are generated from temperature-standardized values of the first set of value vectors and possibly stored as reference characteristics. By comparing temperature-standardized values for the absolute pressure on the inlet and outlet sides of the particle filter and the differential pressure of the second set of value vectors with reference characteristics, flow anomalies can be determined in the exhaust gas system.