| 摘要 |
The invention relates to a method for predicting a fuel dilution level of an oil in an internal combustion engine (200) equipped with an exhaust after treatment system (215) requiring regeneration. The method comprises the steps of zero-setting a counter (102) at oil exchange, making a counter (102) increase for each after treatment system (215) regeneration, making a counter (102) decrease for each time unit an oil temperature is over a threshold value, and signalling to a vehicle operator when the counter (102) has reached a predetermined level. The invention also relates to a counter (102) for determining oil change intervals on an internal combustion engine (200) equipped with an exhaust after treatment system (215) requiring regeneration. The counter includes a zero-setting means (Z), that zero-sets a counter (102)setting when the engine oil is changed, a counter increase means (R1, R2, R3), that increases the counter setting each time the exhaust after treatment system (215) is regenerated, a counter decrease means (OT), that decreases the counter setting each time unit the engine oil temperature is above a threshold value and a signal means (O1, 02), that either gives a signal to a driver that it is time for an oil change, and / or gives a signal to an engine control unit, ECU, to avoid oil diluting regeneration strategies when the counter setting has reached a predetermined value. |
