| 摘要 |
<p>The present invention provides a fuel injection pump for an internal combustion engine, pump plunger means providing sequential pumping strokes, means for changing the timing of the pumping strokes comprising a cylinder, an advance piston movable in said cylinder, means interconnecting said advance piston with said pump plungermeans to advance and to retard the relative timing of the pumping strokes, a source of fluid having a pressure correlated with engine speed providing a speed related pressure, a hydraulic chamber at one end of said piston connected to said source of fluid under pressure to move the advance piston to advance the timing of the pumping strokes in response to increased engine speed, first means for controlling the delivery of fluid from said source to said hydraulic chamber, said first means including means for preventing the delivery of fluid from said source to said hydraulic chamber until a predetermined speed is reached, and second means for controlling the delivery of fluid from said source to said hydraulic chamber, said second means bypassing said first means to deliver fluid from said source to said hydraulic chamber during the starting of the engine thereby to advance the timing of the pumping strokes.</p> |
