Method for operating a motor vehicle internal combustion engine with an exhaust particle filter

US8919106B2 · kind B2 · utility

Assignee

• Daimler AG · DE

Inventors

• Achim Dittler · Stuttgart, DE
• Uwe Gaertner · Winnenden, DE
• Thomas Koch · Remchingen, DE
• Alexander Massner · Eßlingen, DE
• Kevin Sisken · Saline, US
• Frank Zimmermann · Stuttgart, DE

Key dates

• Filing date: Sep 6, 2012
• Grant date: Dec 30, 2014
• Expiry date: Apr 23, 2033

Classification

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

Abstract

A method for operating a motor vehicle internal combustion engine with an exhaust system branch in which a wall-flow exhaust particle filter is arranged. An amount of ash and an amount of soot accumulated in the exhaust particle filter are continuously determined. An ash increase value characterizing an increase in the amount of ash is determined and if pre-set conditions are present, the operation of the internal combustion engine is changed over to a special operating mode for performing an ash detachment and transportation operation, in which operating variables of the internal combustion engine are set such that, on the exhaust entry side in the exhaust particle filter, a pre-settable minimum exhaust flow speed results at which detachment of ash attached to the channel walls of the exhaust particle filter and transportation of detached ash in the direction of the respective inlet channel end is made possible.