| 摘要 |
PROBLEM TO BE SOLVED: To improve fuel economy, and to rapidly reduce a rail pressure of a common rail.SOLUTION: A fuel injection control device 1 of this invention includes a common rail 3 for storing fuel to be supplied to an injector 2, a force-feed pump 4 for force-feeding the fuel to the common rail 3, a pressure reduction valve 5 for returning the fuel in the common rail 3 to a fuel tank 11, a pressure reduction valve control section 6 for feed-back controlling opening and closing operation of the pressure reduction valve 5 in accordance with a deviation between an actual rail pressure and a target rail pressure of the common rail 3, and a pump control section 7 for feed-back controlling a fuel force-feed amount of the force-feed pump 4 by PID control in accordance with the deviation and stopping force-feeding of the fuel from the force-feed pump 4 during opening of the pressure reduction valve 5 by the pressure reduction valve control section 6.SELECTED DRAWING: Figure 1 |
