Fuel injection pump control system in diesel engine

Claim 1

A fuel injection pump control system in a diesel engine wherein injection timing of fuel from an engine-driven feed pump is controlled by a plunger rotatably and axially movable in synchronism with engine rotation and fuel injection flow rate is controlled by the position of a spill ring movably associated with said plunger, said system comprising: an electronic control section providing an output command signal in accordance with engine operating conditions; control valve means selectively dividing a portion of fuel from said feed pump into two parts in response to a command signal; and a spill ring adjusting means for positioning said spill ring independent of feed pump pressure including: a cylinder, a piston reciprocally received in said cylinder, respective ones of said two fuel parts being separately applied to said cylinder at opposite ends of said piston, said piston being linkingly connected to the spill ring, and a pair of flow discharge means operatively connected to said cylinder for continually releasing said two fuel parts from said cylinder, the flow rate through each individual flow discharge means being determined by the position of said piston in said cylinder so that an increase in the flow rate of one of said two fuel parts provides an increase in the flow rate through a corresponding one of the flow discharge means and a decrease in the flow rate through the other flow discharge means.