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• W612762712 abstract "The aim of this thesis project was to create a model of engine oil deterioration, suitable for implementation in the engine control unit. To this end, the model has to be sufficiently simple not to unnecessarily waste limited computing power and yet exact enough not to over- or underestimate the oil change interval too much. Too frequent oil changes mean an unnecessary extra cost for new oil and loss of availability while too long oil change intervals may damage the engine, at an even greater cost. The model was divided into four sub-models, one for each of the processes that cause oil deterioration, i.e. dilution by fuel, chemical degradation, soot contamination and dilution by water. The models created were based on publicized scientific studies of the various processes. In order to validate the models they were implemented in Matlab and compared with experiment data. Various modification attempts were made and the resulting models were evaluated based on their correspondence with measurements. Dilution by fuel, dilution by water and soot contamination are all processes whose causes and dynamics are relatively well known. Oil degradation on the other hand is a complex process that depends on a large number of factors which makes it very complicated to model. This is especially problematic as oil degradation usually is limiting for oil change intervals. Out of the four sub-models that were created, the model for fuel dilution gave the best correspondence with measurements. However data was only available for the part of the model handling evaporation and thus it is unknown how well the model for fuel influx performs. As the model is very simple there is reason to believe that the correspondence between the modelled influx and the actual influx is not very good. The model for oil degradation could not be validated using the available data and further experiments are necessary. However it was concluded from the data available that a model based only on oil temperature, as was first intended, will not be sufficient. The water dilution model was reasonably accurate in predicting average water concentrations, but missed short term variations completely. In order to fully validate the model, further experiments, where the various rates of condensation are measured, will be necessary. The model for oil-soot already available at Scania was considered sufficient and no further work has been done on this model. A short description of the model has been included for completeness." @default.
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• W612762712 date "2011-01-01" @default.
• W612762712 modified "2023-09-23" @default.
• W612762712 title "Modellering av oljedegenerering" @default.
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