| 摘要 |
PROBLEM TO BE SOLVED: To provide a fuel injection control device capable of accurately calculating an actual injection amount on the basis of a pressure drop amount when a target injection amount is equal to or less than a prescribed amount.SOLUTION: An electronic control device acquires (S402) a common rail pressure before injection (Pbefore) at a prescribed crank angle before fuel injection (S400), and stores (S406) a common rail pressure (Ptemp) acquired by sampling when standby time which is a total of pulse width time of an injection command signal and injection end delay time has elapsed. When Ptemp acquired this time is larger than a maximum pressure PAmax up to the previous one (S408: Yes), Ptemp is set as PAmax (S410). When elapsed time (Tnow) after starting of sampling reaches a prescribed time (TfCA) (S412: Yes), a common rail pressure after injection (Pafter) is calculated (S414), and a pressure drop amount &Dgr;P is calculated from Pbefore and Pafter, and an actual injection amount Qr is calculated based on &Dgr;P (S416). |
