Method for determining the loading of a soot filter

US11585258B2 · kind B2 · utility

Assignees

• VOLKSWAGEN AKTIENGESELLSCHAFT · DE
• Robert Bosch GmbH · DE

Inventors

• Dieter Schwarzmann · Heilbronn, DE
• Thomas Binnewies · Ostseebad Nienhagen, DE
• Thomas Kessler · Chur, CH
• Florian Brunner · Magstadt, DE

Key dates

• Filing date: Oct 16, 2019
• Grant date: Feb 21, 2023
• Expiry date: May 24, 2041

Classification

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

Abstract

The invention relates to a method for determining a loading of a soot filter with soot particles from an exhaust gas mass flow of an internal combustion engine in a motor vehicle, a control device for an internal combustion engine having a soot filter, and a computer program product for carrying out the method. In the first step 100 of the method a characteristic curve for the relationship between the exhaust gas mass flow, exhaust gas temperature, ambient pressure, and pressure drop across the soot filter without loading is determined; in the second step 200 a second exhaust gas mass flow and a second pressure drop that occurs during loading of the soot filter are determined; in the third step 300, from the characteristic curve the first pressure drop is determined for which the first and second exhaust gas mass flows have the same value; in the fourth step 400 an estimated value for the loading of the soot filter is computed via a real-time parameter estimation, preferably by use of the gradient method, based on the previously determined parameters. The method allows a reliable determination of the instantaneous loading of a particulate filter, regardless of the type of measuring…