| 摘要 |
A hydraulically actuated fuel injector includes an injector body that defines a fuel nozzle outlet and a plurality of passages, including high pressure actuation fluid passages, and low pressure drainage and vent passages. A piston with at least one hydraulic surface is movably disposed between retracted and advanced positions along a stroke distance in a piston bore defined by the injector body. When acted upon by high pressure actuation fluid, the piston, in cooperation with a plunger, advances from its initial retracted position a certain stroke distance before it uncovers and exposes an actuation fluid flow enhancement annulus. Exposure of the piston hydraulic surface(s) to the additional flow capacity provided via the actuation fluid flow enhancement annulus yields higher piston and plunger acceleration rates, resulting in sustained high piston acceleration and a higher peak fuel injection pressure and flow rate.
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