Förfarande och system för att övervaka kvalitetsförsämringen hos olja

摘要

Method and system for monitoring deterioration of the quality of oil which accumulates in a gathering space (2) in a motor vehicle.In a situation where the oil in the gathering space is allowed to cool to its gelling point, a first temperature value and a second temperature value which represent the temperature of the oil in respective first and second regions of the gathering space are generated. Gelling of the oil is detected on the basis of the difference between these temperature values. When gelling is detected, a gelling point value which represent the oil's gelling point is determined on the basis of one or more measured values for the temperature of the oil in the gathering space at the time when the gelling is detected. The gelling point value is then used to determine whether or not the quality of the oil has deteriorated to such an extent that it needs changing.