| 摘要 |
An electronically controlled, microprocessor equipped fuel injection system for new manufacture or retrofit of existing diesel engines has a tubular injector provided with a fuel pressure amplification chamber next adjacent and communicating directly with an injector nozzle at one end of the tube; the nozzle has atomizing orifices for spraying the pressure amplified fuel into the engine cylinder. A fuel flow controlling solenoid is provided at the opposite end of the tube and all component parts in the tube between the nozzle and a spring loaded solenoid armature are disposed along a common axis extending longitudinally of the tube. Such parts include a fuel pressure amplification plunger, a hydraulic pumping piston for actuating the plunger, a spool valve shiftable toward and away from the armature and a needle valve normally closing the orifices. Three fuel pressures exist in the injector from time to time, namely medium inlet fuel pressure supplied by the engine fuel pump, low pressure return fuel to the supply tank and highly intensified fuel pressure produced in the nozzle upon energization of the solenoid to insure injection of controlled amounts of fuel into a respective cylinder of the engine notwithstanding the pressure conditions existing in a corresponding cylinder during fuel injection.
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