Electrically controlled fuel injection pump

摘要

The invention relates to an electrically controlled fuel injection pump in accordance with German Patent 3,804,025 for internal combustion engines, in particular for direct fuel injection in internal combustion engines with applied ignition, in which a single common cam (4) is used to drive a multiplicity of pump plungers (29), the delivery quantity of which is fed under the control of a rotary-slide valve (46) to the injection nozzles (56) at the injection locations of the internal combustion engine, quantity control being effected by an electrically controlled valve (50). According to the invention, there is, connected to an axial passage (44) of the rotary slide (46), which passage [lacuna] into control bores or control grooves (42, 47, 53) distributed over the circumference of the rotary slide (46) and interacting [lacuna] next to the [lacuna] with the pump working spaces (35) and the delivery lines (55) leading to the injection locations (56) and which can be subjected to the pump pressure of the pump plungers (29), at least one further control bore or control groove (57), which is connected to an accumulator (62). This makes possible a pilot injection, separate from a main injection, at exhaust TDC (Fig. 2). <IMAGE>