| 摘要 |
In an apparatus, a shift quantity calculating unit tentatively shifts a reference fuel spray characteristic to an obtained actual fuel spray characteristic in a phase direction and in a magnitude offset direction while monitoring a distance between the reference fuel spray characteristic and the obtained actual fuel spray characteristic therebetween. The shift quantity calculating unit calculates a shift quantity between the reference fuel spray characteristic and the obtained actual fuel spray characteristic in the phase direction when the monitored distance is minimized. A phase correcting unit shifts the reference fuel spray characteristic by the calculated shift quantity in the phase direction to thereby correct the reference fuel spray characteristic.
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