EP 1586752 B1 20080716 - Method for controlling the lubricating oil dilution of an internal combustion engine and device for monitoring and reducing this oil dilution
Title (en)
Method for controlling the lubricating oil dilution of an internal combustion engine and device for monitoring and reducing this oil dilution
Title (de)
Verfahren und Vorrichtung zur Regelung der Ölverdünnung in einer Brennkraftmaschine
Title (fr)
Dispositif et méthode pour contrôler la dilution de l'huile dans un moteur à combustion interne
Publication
Application
Priority
EP 04101510 A 20040414
Abstract (en)
[origin: EP1586752A1] The present invention relates to a method for controlling the lubricating oil dilution - in volume percent - of an internal combustion engine. Furthermore the invention relates to a device for monitoring and reducing this oil dilution. <??>It is an object of the present invention to provide a method, which enables technologies aiming at reduction of soot and NOx emissions, namely control strategies making use of in-cylinder post injection(s) required for vehicels equipped with particulates filter or lean NOx trap. <??>Another object of the present invention is to provide a device for monitoring and reducing the oil dilution. <??>According to the present invention and with respect to the first object a method is provided comprising the following steps (a) monitoring the oil dilution ratio by calculating and/or estimating the so-called oil dilution state from measured operating parameters, and (b) reducing the oil dilution ratio by promoting the evaporation of the liquid contaminates - such as water, glycol and in particular the light hydrocarbon fuel components mixed with the lubricating oil - by elevating the temperature of the diluted lubricating oil, and/or promoting the partial combustion of the diluted lubricating oil by increasing blow-by gas flow from crankcase to engine cylinder during fuel cut off in deceleration. <IMAGE>
IPC 8 full level
F01M 5/00 (2006.01); F02D 41/12 (2006.01)
CPC (source: EP)
F01M 5/001 (2013.01); F01M 2001/165 (2013.01); F02D 41/123 (2013.01); F02D 2250/11 (2013.01)
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 1586752 A1 20051019; EP 1586752 B1 20080716; DE 602004015068 D1 20080828
DOCDB simple family (application)
EP 04101510 A 20040414; DE 602004015068 T 20040414