| 摘要 |
<p>ELECTROMAGNETIC UNIT FUEL INJECTOR -- -- An electromagnetic unit fuel injector for use in a diesel engine includes a housing means with a pump therein that includes a cam actuated plunger reciprocable in a bushing for supplying fuel via a discharge passage means in the housing means to a spring biased, pressure actuated, injection valve positioned to control flow discharge out through the spray tip outlet of the housing means, the discharge passage means also being connected to a low pressure, fuel drain passage means with flow from the discharge passage means, that includes a metering orifice passage therein, to the drain passage means being controlled by a normally open, electromagnetic valve. During a pump stroke of the plunger, the electromagnetic valve can be energized thereby blocking flow to the low pressure fuel drain passage means whereby allowing the pressure of fuel in the discharge passage means to increase during the pump stroke of the plunger to effect unseating of the injection valve.</p> |
