| 摘要 |
<p>A pair of solenoids (72,74) are disposed coaxially with and around a hollow cylindrical cut-off valve (68), which includes an inner non-magnetic sleeve (92) and an outer permanent magnet sleeve (94). The cut-off valve (68) slidably engages a fuel distributing plunger (48) which injects fuel according to its axial reciprocation. The cut-off valve (68) serves to control the fuel injection quantity via the timing of exposure of a fuel injection cut-off port (66) in the plunger (48). When the pair of solenoids (72,74) are energized in accordance with operating parameters of the engine, the cut-off valve (68) is moved to a corresponding position along the plunger (48). A sensor (78) senses the actual position of the cut-off valve (68) for feedback control thereof. A pair of disc-like permanent magnets (96) may be disposed opposite either extreme of travel of the cut-off valve (68) in spaced relationship thereto (Figure 15). A pair of non-magnetic discs (98) may be disposed in place of the pair of disc-like permanent magnets (Figure 16). A biasing member (100,110,130) may be disposed between the cut-off valve (68) and the plunger housing (50) for preventing the cut-off valve (68) from being attracted by the plunger housing (50) and for preventing rotation of the cut-off valve (68) relative to the plunger housing (50). The biasing member may be diaphragm (100) (Figure 2), coil spring (130) (Figure 14) or a leaf spring (110) (Figure 7).</p> |
