Multi-cylinder internal combustion engine and method for operation thereof

US7293405B2 · kind B2 · utility

Assignee

• Daimlerchrysler AG · US

Inventors

• Markus Kemmner · Unterensingen, DE
• Thomas Koch · Remchingen, DE

Key dates

• Filing date: Jul 9, 2004
• Grant date: Nov 13, 2007
• Expiry date: Jul 9, 2024

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F01L1/34
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

In a multi-cylinder internal combustion engine and a method for operating a multi-cylinder internal combustion engine, cylinders are assigned an exhaust line and, in each case, a gas inlet valve and a gas outlet valve which are used for the charge cycle. At least one of the cylinders of the internal combustion engine has an additional outlet valve through which, in the opened state, a flow connection can be established between the combustion chamber and the exhaust line. At least one of an exhaust gas composition and an exhaust gas temperature is changed compared to the normal operating mode, and regeneration of the exhaust gas cleaning unit can be set in conjunction with a regeneration operating mode for regenerating an exhaust gas cleaning unit which is arranged in the exhaust line by activating the additional outlet valve of at least one cylinder. For the method, the additional outlet valve of at least one cylinder is opened at least temporarily in conjunction with regeneration of the exhaust gas cleaning unit.