| 摘要 |
A direct injection diesel engine (1) is provided with a fuel injection nozzle (7) which is capable of performing a multistage injection. In a middle-or-high load region, in order to reduce soot, an after-injection is performed immediately after a main injection. An injection timing of the after-injection is set from a map in accordance with a driving condition (step 1). During a transient time, the injection timing of the after-injection is corrected on a basis of a difference ”P between an actual rail pressure rPrail and a target rail pressure tPrail (step 3). In a case where the injection timing after the correcting is more retardation angle side than a threshold value, the after-injection is inhibited (steps 4 ˆ¼6). |
