| 摘要 |
PROBLEM TO BE SOLVED: To prevent occurrence of failure such as poor lubrication by efficiently restraining freezing of moisture mixed into oil O in an engine 1 using alcohol-containing fuel.SOLUTION: An amount of moisture mixed into oil O is estimated based on the history of a fuel injection amount during operation of an engine 1 (steps ST 102, ST 103). An amount of fuel mixed into the oil O is increased when the estimated moisture amount is equal to or higher than a prescribed amount compared to when the amount is lower than the prescribed amount (steps ST 104, ST 105). Accordingly, freezing of the moisture can be suppressed by adding alcohol to the oil O. The amount of the fuel mixed into the oil O is preferably increased by post ignition.SELECTED DRAWING: Figure 3 |
