Fuel injection control apparatus for use to engine

Abstract

A fuel injection control apparatus for use in an engine wherein fuel injection is controlled in accordance with the conditions of the engines operation. This apparatus is provided with a fuel quantity control unit of the distribution type which measures and discharges an amount of fuel in response to detection signals which represent the conditions of the engines operation, and with a plurality of unit injectors for distributing and supplying fuel to their respective engine cylinders, said fuel being set and measured by the fuel quantity control unit. Each of said unit injectors comprises a compression plunger driven by a cam system which is rotated by a rotation shaft of said engine, a compression pump chamber whose fuel pressure is set by the operation of said compression plunger, an injection plunger driven by the fuel pressure in the compression pump chamber, an injection pump chamber which is filled with fuel whose pressure has been set by the operation of said injection plunger and whose amount has been adjusted by the fuel amount adjuster means, and a timing plunger whose position is set by the amount of fuel adjusted, wherein the fuel pressure in the compression pump chamber caused when the compression plunger is driven causes the timing plunger to move to a specified position and then acts on the injection plunger to raise the pressure in the injection pump chamber, thereby enabling the quantity-adjusted fuel in the injection pump chamber to be injected.