Method for operating an internal combustion engine

Abstract

The invention relates to a method for operating an internal combustion engine, wherein a crank housing (2) of the internal combustion engine comprises a ventilation (9) into the intake tract (10) of the internal combustion engine, characterized in that, during the outgassing of fuel from engine oil present in the crank housing (2), the operating point of the internal combustion engine is modified such that a predeterminable air / fuel ratio is not fallen below.

Description

technical field [0001] The invention relates to a method for operating an internal combustion engine, wherein the crankcase of the internal combustion engine has an exhaust gas line leading into an intake system of the internal combustion engine. Background technique [0002] The crankcase of the internal combustion engine does not close tightly. Small airflows flow past the piston rings, which would generate high pressure in the crankcase without openings in the crankcase. This pressure build-up is avoided by the so-called crankcase vent line. The crankcase exhaust gas line conducts gases from the crankcase into the intake manifold and from there into the intake system of the internal combustion engine. Avoid direct connection to the suction manifold vacuum here, since otherwise the crankcase would be placed at the suction manifold pressure level. [0003] Via the piston rings, not only the combusted so-called blow-by gas (Blow-By-Gase) is pressed into the crankcase, but...

AI Technical Summary

Problems solved by technology

[0007] If the internal combustion engine is warmed up for a short period of time (e.g. due to high load and high rotational speed) with such high levels of fuel added to the engine oil and is then run idling, the gaseous exhaust volume flow is often uncontrollable

Further leaning by the injection valve is then often not possible because the minimum injection time has already been reached

Images