Fuel injection arrangement for internal combustion engines

Abstract

A fuel injection arrangement for internal combustion engines, having a high-pressure fuel pump driven by the engine. The high-pressure fuel pump fills a pressure reservoir chamber with fuel at high pressure which chamber in turn communicates via injection lines with injection valves that protrude into the combustion chamber of the engine to be supplied. For free choice of the injection pressure at the injection valves independently of the rpm, the proposed system operates with two pressure levels. The higher pressure level is the maximum pressure in the pressure reservoir chamber, which via a connecting line that can be opened by means of a connecting valve communicates with a pressure chamber that builds up a second pressure level, and from that chamber the injection lines lead away in turn. The pressure chamber can also be rapidly pressure-relieved via a relief line that has a magnet valve. By way of opening the valve, the pressure in the pressure chamber and in the injection lines can now be varied or modulated during the injection event; a constant injection pressure is attainable via a reservoir device that communicates with the pressure chamber.

Dependencies are inferred from the claim text.