Volkswagen Ag

Volkswagen Akiihngesellschaft

Mathias Hauptvogel

Falk-Christian Baron Von Ceumern-Lindenstjerna

Christoph Nee

Fabian Berski

Stephan Wassmann

Sebastian Gehrke

A method for diagnosing a crankcase system of an internal combustion engine. A pressure value is captured in a crankcase system. A pressure value of a reference pressure is ascertained or a pressure value to be expected in the crankcase system is modeled. A gradient of the pressure value in the crankcase system and a gradient of the reference pressure or the modeled pressure in the crankcase system is formed. The two formed gradients are integrated over time. The function of the crankcase system is evaluated based on the values obtained by the integrations. A control device as well as an internal combustion engine for carrying out the method are provided.

Method for diagnosing a crankcase system of an internal combustion engine, and internal combustion engine

A method for diagnosing a combustion machine, wherein the combustion machine comprises at least one internal combustion engine and one intake air line via which fresh air can be fed to the internal combustion engine. In addition, at least one intake air compressor and, upstream from the intake air compressor, a control flap are integrated into the intake air line. In one operating state of the combustion machine, the control flap is closed so far that a negative pressure relative to the ambient pressure is produced by means of the running internal combustion engine in the portion of the intake air line that lies between the control flap and the internal combustion engine, with an actual value that is associated with this negative pressure being compared with a target value and the presence or absence of leakage in this portion of the intake air line being deduced from any difference that might exist between the actual value and the target value.

Method for diagnosing a supercharged internal combustion engine for leakage in a portion of the intake air line

The invention relates to an internal combustion engine with an air intake system and an exhaust system is embodied as an internal combustion engine, in particular a gasoline engine, that is charged by means of an exhaust gas turbocharger. At least one three-way catalytic converter is arranged in the exhaust system of the internal combustion engine. Furthermore, a low-pressure exhaust gas recirculation system is provided that connects the exhaust system downstream from a turbine of the exhaust gas turbocharger and upstream from the at least one three-way catalytic converter to the air intake system upstream from a compressor of the exhaust gas turbocharger. The invention further relates to a method for exhaust aftertreatment of such an internal combustion engine.

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Weferlingen, Germany

Mathias Hauptvogel