| 摘要 |
PURPOSE:To make it possible to precisely control pilot fuel injection and main fuel injection following the latter by controlling the time intervals of control signals for a fuel overflow solenoid valve in accordance with an output signal from a DVC sensor. CONSTITUTION:A fuel overflow solenoid valve 11 for opening and closing the passage between a pressurizing chamber which pressurizes fuel and pressure- feeds fuel into a fuel injection valve, and a return passage 15, is twice energized in accordance with control signals at a predetermined interval during one pressure-feed cycle so as to allow the fuel injection nozzle to perform pilot inject on and main injection. In this arrangement, a DVC sensor 40 delivers an actual valve closing signal and an actual valve opening signal in accordance with the motion of a needle valve 105 in the solenoid valve. Further, a control circuit 9 controls the time intervals of the control signals for the solenoid valve 11 in accordance with an output from the DVC sensor 40. With this arrangement it is possible to set the predetermined time intervals a ways to an optimum value in accordance with a change of the solenoid valve 11, thereby it is possible to control always the pilot injection and the main injection following the latter.
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