초록

A fuel injection pump is proposed in which, at relatively low rpm, there is an outflow of a partial quantity of fuel for the purpose of prolonging the injection time. This outflow begins only after the injection has already begun.

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In a fuel injection pump for supplying fuel to injection nozzles of self-igniting internal combustion engines, having: housing means within which a bore and a suction chamber are defined; a pump piston mounted for reciprocating movement within the bore as a function of engine rpm, said housing means

In a fuel injection pump for supplying fuel to injection nozzles of self-igniting internal combustion engines, having: housing means within which a bore and a suction chamber are defined; a pump piston mounted for reciprocating movement within the bore as a function of engine rpm, said housing means and piston defining a pump work chamber in said bore, a plurality of pressure lines, each adapted to be connected at one end to the housing means for communicating with the work chamber and at the other end to an injection nozzle, and a fuel injection quantity control device for changing the fuel quantity delivered by said fuel injection pump into said pressure lines as a function of engine parameters, the improvement comprising: a relief conduit containing a throttle, the relief conduit being connected to the work chamber and to the suction chamber for passage therethrough of a partial fuel quantity during a part of the compression stroke of the piston, said relief conduit being controlled by at least one control edge of the piston and a control element actuated by said fuel injection quantity control device both arranged in line to one another for delivery of the partial fuel quantity to the suction chamber, when the piston has executed a predetermined pre-stroke of its compression stroke, during which time the remaining fuel has reached the injection pressure, and a control slide further controlling the cross section of said relief conduit in line to said control edge and said control element to selectively block or throttle the fuel flow through said relief conduit.