Volkswagen Ag

Hans-Georg Nitzke

Jens Jeschke

Axel Groenendijk

Michael Mazur

Werner Aberle

Thomas Lang

Jörn Müller

Uwe Scher

Lothar Nee

Achim Freitag

Dieter Mannigel

Jürgen Wendt

Jörg Larink

Oliver Cassebaum

Johannes Westendorf

Thorsten Rebohl

Matthias Dockhorn

Jürgen Gloger

An internal combustion engine has a high-pressure exhaust-gas recirculation line and a low-pressure exhaust-gas recirculation line with a low-pressure exhaust-gas recirculation valve. The low-pressure exhaust-gas recirculation line branches off from the exhaust-gas system downstream of a turbine of an exhaust-gas turbocharger and opens into a fresh-air system upstream of a compressor of the exhaust-gas turbocharger. An exhaust-gas flap is disposed in the exhaust-gas system downstream from where the low-pressure exhaust-gas recirculation line branches off from the exhaust-gas system. At least one pressure sensor is disposed in the low-pressure exhaust-gas recirculation line and configured such that the at least one pressure sensor determines a pressure difference in the low-pressure exhaust-gas recirculation line between a point upstream of the low-pressure exhaust-gas recirculation valve and a point downstream of the low-pressure exhaust-gas recirculation valve. A method for operating an internal combustion engine is also provided.

Internal combustion engine with an exhaust-gas recirculation and method for operating an internal combustion engine

An engine management system uses physically based models to determine the composition and mass of the fresh air/exhaust gas mixture suctioned by an internal combustion engine. The models are closely coupled to each other in a partial manner and are used to simulate the filling of the combustion chamber with the suctioned fresh air/waste gas mixture in order to simulate the flow of the mass of re-circulating exhaust gas, the behavior of the exhaust gas manifold upstream and downstream from a turbine, the storage behavior of the intake manifold, and the behavior of the intake pipe or inlet manifold whereby the fresh air/exhaust gas mixture is fed to the combustion engine from a corresponding mixing point where the suctioned fresh air is mixed with the exhaust gas re-circulated via the exhaust gas re-circulation line. As a result, a plurality of additional state variables can be determined without additional sensors.

Method for determination of composition of the gas mixture in a combustion chamber of an internal combustion engine with exhaust gas recirculation and correspondingly configured control system for an internal combustion engine

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Wettmershagen, Germany

Hans-Georg Nitzke