Daimler Chrysler Ag

Daimler Ag

Markus Kemmner

Thomas Koch

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.

Multi-cylinder internal combustion engine and method for operation thereof

A method of operating an internal-combustion engine () which has at least one cylinder () with a combustion chamber () assigned to it, in the cylinder (), a piston () carries out an oscillating movement between a lower dead center and an upper dead center. In the combustion chamber () a fuel-air mixture is ignited. Exhaust gas forming during the combustion of the fuel-air mixture in the combustion chamber () is fed to an exhaust pipe (), and the exhaust gas is purified in an exhaust treatment device () arranged in the exhaust pipe (). For the regeneration of the exhaust treatment device (), the temperature in the exhaust pipe () is increased in that an outlet valve () opening up the combustion chamber () in the direction of the exhaust pipe () is opened in the range of the upper compression dead center of the piston ().

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Unterensingen, Germany

Markus Kemmner