| 摘要 |
PROBLEM TO BE SOLVED: To improve a controlling characteristics of fuel pressure within an accumulator pipe.SOLUTION: In the case that a subsequent pressure reduction valve is driven subsequent to driving of a preceding pressure reduction valve, if a pump rotational position becomes a prescribed calculating position where a driving amount of a pressure reduction valve 28 under a subsequent driving of the pressure reduction valve is calculated after stopping of electrical energization of the pressure reduction valve 28 in the preceding driving of the pressure reduction valve, a pressure estimation value that is a common rail pressure upon completion of pressure reduction through the preceding driving of the pressure reduction valve is calculated on the basis of a calculating time pressure that is a fuel pressure detected by a rail pressure sensor 27 under a timing in which the pump rotational position becomes a prescribed calculating position and a rotational required time required from an energization stopping timing for the preceding driving of the pressure reduction valve to a timing when the pump rotational position becomes the prescribed calculating position or its relative parameters and the driving amount of the subsequent driving of the pressure reduction valve is calculated on the basis of the pressure estimation value. |
