Diesel Engine Control Device and Control Method

摘要

A direct injection diesel engine is provided with a fuel injection nozzle 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. During a transient time, the injection timing of the after-injection is corrected on a basis of a difference ΔP between an actual rail pressure rPrail and a target rail pressure tPrail. In a case where the injection timing after the correcting is more retardation angle side than a threshold value, the after-injection is inhibited.

主权项

1. A control apparatus for a direct injection diesel engine, the diesel engine having a fuel injection nozzle capable of performing a multi-stage injection and in which an after-injection is performed immediately after a main injection, the control apparatus comprising:
means for setting a target fuel pressure on a basis of an engine revolution speed and a load and variably controlling a fuel pressure supplied to the fuel injection nozzle along the target fuel pressure; means for setting a base value of an injection timing of the after-injection on a basis of the engine revolution speed and the load; and means for correcting the base value of the injection timing of the after-injection toward an advance side in a case where an actual fuel pressure is higher than the target fuel pressure, on a basis of a difference between the detected actual fuel pressure and the target fuel pressure, during a transient time of the engine.