Exhaust aftertreatment system and method for regenerating a particulate filter

US11053827B2 · kind B2 · utility

Assignee

• VOLKSWAGEN AKTIENGESELLSCHAFT · DE

Inventors

• Stefan Paukner · Wolfsburg, DE
• Falk-Christian Baron Von Ceumern-Lindenstjerna · Braunschweig, DE
• Michael Manz · Langenhagen, DE

Key dates

• Filing date: Jun 19, 2019
• Grant date: Jul 6, 2021
• Expiry date: Jun 19, 2039

Classification

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

Abstract

The invention relates to an exhaust aftertreatment system for an internal combustion engine that, at its outlet, is connected to an exhaust gas system. In the exhaust gas system, a three-way catalytic converter close to the engine, an electrically heatable three-way catalytic converter downstream from the three-way catalytic converter close to the engine, and further downstream, a particulate filter or a four-way catalytic converter are situated in the flow direction of an exhaust gas of the internal combustion engine through an exhaust duct of the exhaust gas system. In addition, the exhaust aftertreatment system includes a secondary air system with a secondary air pump and a secondary air line, which opens into the exhaust duct at an introduction point downstream from the three-way catalytic converter close to the engine and upstream from the electrically heatable three-way catalytic converter. The invention further relates to a method for regenerating a particulate filter or the four-way catalytic converter by use of such an exhaust aftertreatment system.