Method for diagnosing a crankcase system of an internal combustion engine, and internal combustion engine
AssigneeVolkswagen Aktiengesellschaft
InventorsMathias Hauptvogel, Stephan Wassmann
Life of this patent
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Abstract
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.
Claims15
A method for diagnosing a crankcase system of an internal combustion engine, the method comprising:
- capturing a pressure value in a crankcase system;
- ascertaining a pressure value of a reference pressure or modeling a pressure value to be expected in the crankcase system;
- forming 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;
- integrating the two formed gradients over time;
- and
- evaluating the function of the crankcase system based on the values obtained by the integrations.
Dependencies are inferred from the claim text.