Fuel injection unit for IC engine with high pressure pump - drawing fuel via filling valve to pump working chamber defined by pump piston and delivers by valve at high pressure to HP storage

摘要

The pressure at the HP storage (24) is maintained at a set value via a pressure control unit (41, 37). A distributor (2) is driven in synchronism with the IC engine, and it successively feeds the engine injection valves when rotated across a distributor opening (31). A first valve (29) is provided electrically controlled by a unit (37) in a fuel line (28, 15) leading from the HP storage (24) to the distributor opening (31). A second electrically controlled valve (36) is provided downstream of the first valve (29) in a discharge line connected to the distributor opening (31). The opening of the first electrically controlled valve (29) with a closed second valve (36) begins the injection and, upon opening of the second electrically controlled valve completion of the injection is determined for regulating the injection time and amt. of fuel. The first valve (29) is controlled to close with the simultaneous opening of the second valve (36). This relationship can be varied. ADVANTAGE - Very simply constructed with as few components as possible.