Fuel injection system for an internal combustion engine

Abstract

A fuel injection system with a common rail pressure reservoir which is filled with fuel at high pressure, and a dual substance nozzle for dual-fluid injection of fuel and a supplementary liquid into an internal combustion engine. The system includes a 2/2-way valve in the injection line between the common rail pressure reservoir and a pressure chamber surrounding the nozzle needle of the dual substance nozzle. A pressure fluid container with supplementary liquid under pressure, which via a storage valve can charge the supplementary liquid line with a respective predeterminable quantity of supplementary liquid and that in turn can be charged with supplementary liquid by means of a pump via a check valve and its internal pressure can be kept at a desired level by a pressure regulating valve. As a result, the otherwise usual, technologically substantially more complex 3/2-way magnet control valves can be replaced by a single, less expensive 2/2-way valve. At the same time, the possibility is created of shifting the metering for the supplementary liquid to a single metering valve that serves an entire group of injection valves.

Dependencies are inferred from the claim text.