| 摘要 |
<p>A fuel injector (1) for a compression ignition internal combustion engine which comprises a fuel injection valve having an injection valve member (5) which is moveable in use, under the influence of fuel pressure within an injection valve member control chamber (25) acting upon it, between a closed position and an open position. The fuel injector (1) further comprises a high pressure fuel supply passage (17) to the injection valve member control chamber (25), and an actuator operable to open and close a discharge valve (61) connected between the injection valve member control chamber (25) and a fuel outlet passage (59) to a low pressure reservoir or drain. A shut-off valve is provided in the high pressure fuel supply passage and the shut-off valve has a shut-off valve member (29) which is moveable in use, under the influence of fuel pressure within a shut-off valve member control chamber (51) acting upon it, between a closed position and an open position. The shut-off valve member control chamber (51) is connectable to the low pressure reservoir or drain via the discharge valve (61), and a fuel transfer passage (63) is provided between the injection valve member control chamber (25) and the low pressure reservoir or drain.</p> |
