| 摘要 |
For each cylinder of the internal combustion engine, the fuel injection system has one high-pressure fuel pump and one fuel injection valve communicating with it. A first pump piston of the high-pressure fuel pump defines a pump work chamber, which communicates with a pressure chamber of the fuel injection valve; the fuel injection valve has an injection valve member, by which injection openings are controlled, and which is movable by the pressure prevailing in the pressure chamber in an opening direction counter to a closing force. The high-pressure fuel pump has a second pump piston, which defines a work chamber, and on which, after an initial pumping stroke, the first pump piston comes to rest, so that the second pump piston likewise executes a pumping stroke. By means of a first control valve, a communication of the pump work chamber with a relief chamber is controlled, and by a second control valve, a communication of a control pressure chamber, which is in communication with the work chamber and is defined by a control piston acting at least indirectly on the injection valve member in the closing direction, with a relief chamber is controlled.
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