Engine oil degradation judging method and apparatus

摘要

A method of determining a degree of oil degradation in the diesel engine depending on an injection end point in such an injection way as to cause the injection 0end point to be earlier that a specific point (TB) and depending on the injection amount after the specific point and the injection end point in such an injection way as to cause the injection end point to be later than the specific point. In every fuel injection, it is judged whether the injection end point is set before or after the specific point, and a current injection degradation value is obtained by using a corresponding map. A cumulative added value is obtained to judge the oil degradation.