| 摘要 |
An ECU (60) for an engine (10, 70) monitors a change of an actual fuel pressure (NPC), when a target fuel pressure (PFIN) is changed stepwise. In one abnormality, the time required for the actual fuel pressure to reach the target fuel pressure is equal to that when an actuator (34) operates normally. However, the maximum value of a differential value (dNPC/dt) with respect to time of the actual fuel pressure is different from that when the actuator operates normally. For this reason, a normal range is set in advance for the maximum value of the differential value with respect to time of the actual fuel pressure and when the maximum value of the differential value with respect to time of the actual fuel pressure is out of the normal range, it is determined that the actuator operates abnormally. |
