| 摘要 |
A fuel injection system includes fuel injection valves arranged to be supplied with part of pressurized fuel which is being supplied to or has been supplied to a fuel injection pump from a fuel feed pump. The pressurized fuel supplied to the injection valves acts upon the nozzle needles against their lifting motions to cause the valves to operate with higher valve opening pressure. The supply of the pressurized fuel to the valves is controlled as a function of an operating condition of an engine associated with the fuel injection system. For instance, the fuel supply is carried out when the rotational speed of the engine exceeds a predetermined rpm, so that higher valve opening pressure is available when the engine operates in a high rpm region.
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