Method for operating motor vehicle internal combustion engine

US9458799B2 · kind B2 · utility

Assignee

• Daimler AG · DE

Inventors

• Ortwin Balthes · Sachsenheim, DE
• Berthold Keppeler · Owen, DE
• Siegfried Mueller · Großingersheim, DE

Key dates

• Filing date: Oct 18, 2011
• Grant date: Oct 4, 2016
• Expiry date: Oct 23, 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 for operating a motor vehicle internal combustion engine that has an exhaust tract with an exhaust gas purification unit acting catalytically and/or by filtration with which combustion air supplemented by exhaust gas diverging from the exhaust tract is fed to the combustion chambers of the internal combustion engine by exhaust gas branching off from the exhaust tract at a total exhaust gas recirculation rate. The total exhaust gas recirculation rate has a low-pressure proportion diverging downstream from the exhaust gas purification unit and a high-pressure proportion diverging upstream from an exhaust gas turbocharger turbine arranged in the exhaust tract. An essentially decreasing low pressure proportion is set with at least approximately the same operating points of the internal combustion engine with an increasing operating period of the exhaust gas purification unit.