Method for monitoring crankcase pressure
AssigneeMTU Friedrichshafen GmbH
InventorsJohannes Baldauf, Patrick Dussler, Eugen Bucher, Vadzim Khakholka
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Abstract
A method for monitoring crankcase pressure, in which a learning curve is calculated according to a target-actual deviation of the crankcase pressure, the target crankcase pressure is adjusted according to the learning curve, and a limit curve is calculated according to the target crankcase pressure. The actual crankcase pressure is monitored for exceedance of the limit curve. After an engine start, upon identification of a steady-state operation of the internal combustion engine, the actual crankcase pressure is compared with a limit value and, if the limit value is identified as being exceeded, the learning curve and, as a result, the limit curve are reset to their initial values.
Claims5
A method for monitoring crankcase pressure of an internal combustion engine, comprising the steps of:
- calculating a learning curve according to a target-actual deviation of the crankcase pressure;
- adjusting a target crankcase pressure according to the learning curve;
- calculating a limit curve according to the target crankcase pressure;
- monitoring actual crankcase pressure for exceedance of the limit curve;
- and after an engine start, upon identification of a steady-state operation of the internal combustion engine, determining that the actual crankcase pressure exceeds a limit value, and resetting the learning curve to a first initial value and the limit curve to a second initial value when the actual crankcase pressure exceeds the limit value.
Dependencies are inferred from the claim text.