Patent ID: 6067964
Filing Date: 2000-05-30
Classification: F02M

Abstract:
A fuel injection system for an internal combustion engine, comprising a high-pressure pump (1) for delivering fuel into a dual-fuel injector (3), a delivery device for delivering an additive fluid conveyed by way of a check valve (3.4), into an additive fluid line (15) that leads to the dual-fuel injector (3) and is connected to a pressure chamber (3.5) that encloses an injector needle (3.1) of the dual-fuel injector (3), a valve device for storing the additive fluid quantity in the dual-fuel injector (3), wherein an opening and closing of the injector needle (3.1) occurs by means of the pressure of a common rail pressure reservoir (2; 20; 30; 40) filled with high-pressure fuel, the valve device is disposed at least partially in an injection line (6), and when storing the additive fluid, interrupts the fuel supply to the injector (3) and connects the pressure chamber (3.5) to a low-pressure fuel side and otherwise interrupts a connection to a low-pressure fuel side and acts on the pressure chamber (3.5) with high-pressure fuel, a first 2/2-way valve (MV1) is provided in the injection line (6) between the common rail pressure reservoir (2; 20; 30; 40) and the pressure chamber (3.5) and a second 2/2-way valve (MV2) is provided, whose inlet, via a supply line (7), is connected to the injection line (6) at a point between the first 2/2-way valve (MV1) and the pressure chamber (3.5), and whose outlet is connected to the low-pressure fuel side via an outlet line (8).