| 摘要 |
The oil of a diesel engine is exchanged for each running at a predetermined distance. The oil exchange is carried out by estimating the amount of soot generation by combustion based on a running distance, and is not very accurate. The oil is exchanged earlier. Therefore, the oil is consumed wastefully and a cost of maintenance is increased. There has been found a phenomenon (correlation) in which the degree of oil degradation in the diesel engine is determined depending on an injection end point in such an injection way as to cause the injection end point to be earlier than a specific point (TB) and is determined 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. When the amount of soot generation is obtained by utilizing the phenomenon, the degree of oil degradation can be obtained more accurately than that in the conventional art. In every fuel injection, it is judged whether the injection end point is set before or after the specific point (Step 8), and a current injection degradation value is obtained by using a corresponding map (Step 9, 10). A cumulative added value is obtained to judge the oil degradation.
|
