FUEL INJECTION DEVICE FOR AIR COMPRESSING COMBUSTION ENGINES

A fuel injection device for air compressing combustion engines is provided. In order to reduce undesirable combustion noises it is suggested to divide the injection step into a pre-injection and a main injection. For this purpose, a pressure wave generator is introduced into the injection line which ensures that, even under partial load and at low revolutions of the combustion engine, due to the sudden opening of the pressure wave generator, a high pressure level for the pre-injection is provided. The opening pressure of the pressure wave generator is controlled by the play of forces between the effective hydraulic piston surface and a closing spring, respectively, a piston, whereby the piston may be actuatable via a performance range controlled auxiliary pressure source. Due to the high pressure level provided the pre-injection portion is finally atemized. Subsequent to the pre-injection the main injection commences with a delay resulting from the travel time difference between the two injection lines.