Patent ID: 7996141
Filing Date: 2011-08-09
Classification: F01M,F02D,F02M

Abstract:
1. A method for operating an internal combustion engine with venting via a breather of a crankcase into an intake tract, comprising the following steps: measuring one or more operating parameters of the internal combustion engine; calculating a mass blow-by flow of fuel from the crankcase into the intake tract as a function of the one or more operating parameters measured; defining a permissible range of a fuel-air ratio between the fuel supplied to the internal combustion engine and fresh air supplied to the internal combustion engine as a function of the calculated mass blow-by flow of fuel; determining an actual fuel-air ratio in the internal combustion engine; comparing (a) the determined actual fuel-air ratio with (b) the permissible range of a fuel-air ratio defined as a function of the calculated mass blow-by flow of fuel; and based at least on the comparison, controlling or ascertaining operability or malfunction of the internal combustion engine.