| 摘要 |
The fuel injection system according to the invention comprises a nozzle ( 2 ) with an inlet and a needle ( 15 ). A control piston ( 16 ) forms a control chamber ( 17 ) and abuts the needle such that a higher pressure in the control chamber urges the piston to close the nozzle. A cam-driven plunger ( 5 ) forms a plunger chamber ( 7 ) connected to the inlet of the nozzle. The system also comprises a common rail ( 11 ) for fuel, a feed line ( 13 ) and an electrically operated valve ( 9 ). The valve isolates the chamber from the common rail and connects it to the line while in a third position, isolates it from both the line and the common rail in a second position, and isolates it from the line and connects it to the common rail in a first position. There are also means ( 12 ) for pressurizing the feed line with a relatively low fuel feed pressure and a fuel tank ( 20 ). The control chamber is connected to the common rail.
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