| 摘要 |
A fuel injector ( 1 ) in an internal combustion engine, wherein an intermediate chamber control valve ( 26 ) operated by the fuel pressure in a common rail ( 2 ) is arranged in a fuel flow passage ( 25 ) connecting a two-position switching type three-way valve ( 8 ) and an intermediate chamber ( 20 ) of a booster piston ( 17 ). When the fuel pressure in the common rail ( 2 ) is in a high pressure side fuel region, the booster piston ( 17 ) is operated by this intermediate chamber control valve ( 26 ), while when the fuel pressure in the common rail ( 2 ) is in a low pressure side fuel region, the operation of the booster piston ( 17 ) is stopped by this intermediate chamber control valve ( 26 ).
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