| 摘要 |
PURPOSE:To achieve the reduction in burning noise by controlling the valve closing timing of a solenoid valve for overflowing fuel at the pressurizing stroke of the plunger of a fuel injection pump at the time of idle or low load operation so as to reduce the fuel injection rate. CONSTITUTION:In the subject device, a solenoid valve M6 is interposed in a fuel releasing passage M5 which communicates a fuel pressurization chamber M4 in a plunger pump M3 having a plunger M2 freely capable of reciprocally moving in the axial direction of a fuel injection pump M1 to the low-pressure side, and the fuel injection quantity is controlled by controlling the fuel overflow ing quantity by the open/shut operation of this solenoid valve M6. IN the above, the control circuit M7 of the solenoid valve M6 is so constituted that, in the period of time in which an operating condition discriminating means S1 descriminates the operation to be in a specific operating condition such as an idle condition or low-load operating condition, the valve closing timing of the solenoid valve M6 during forward movement of the plunger M2 is deter mined, and in the other discriminating period of operating condition the valve opening timing of the solenoid valve M6 during the forward movement of the same is determined by a setting means S2.
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