The method of calculating the limit parameter states characteristic of oil state

In the majority of transport systems, they use the exploiting strategies where the use of oil is calculated in accordance to the following criteria: -the distance in kilometres travelled, -the time of engine work, -petrol used by an engine. When the value of one of the above criteria is reached, oil must be changed regardless its real state and its potential to be still used. If the oil potential were made use of, it would increase the effectiveness of the working system radically. The subject of the research is the changes of metal elements content in oil depending on lengthening the usage of examined oil. The thesis shows the results the operation research of engine oil as well as the results of the research of models that calculate the limit states of the content of some metallic elements in tested oil. The exploiting research was based on the samples taken from engine oil of some bus makes. On the basis of the results of the exploitation research, according to the distance in kilometres travelled of buses, the content of metallic elements in examined engine oil has been calculated. On the basis of self research and literature analysis, it has been stated that there is a lack of comfortable and reliable methods of assessing limit states of engine oil in transport systems. In the following thesis, the attempt to lengthen the mileage of engine oil on the basis of calculating the change of the content of the crucial metallic elements has been taken.