| 摘要 |
This fuel injection device extends the duration which elapses from the injection starting point to the point of maximum lift of the needle valve to lower the initial injection ratio, thereby reducing NOx emissions. Further, the time which elapses from the starting point of injection termination to the nozzle hole closing point is decreased to ensure positive fuel cutoff, increase the injection rate immediately before the end of the injection process and reduce emissions such as soot and HC. In this fuel injection device, the passage for supplying high-pressure fuel into the balance chamber is formed larger than the orifice for discharging the fuel from the balance chamber, and a normally open check valve is provided in the annular chamber.
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