Wartsila Diesel International Ltd Oy

Goran Hellen

Dave Jay

An injection arrangement for an internal combustion engine, especially a diesel engine, for injecting different pressure mediums directly into a cylinder of the engine, which arrangement includes a first valve (3), which is arranged to inject fuel, and a second (4) valve, which is arranged to inject an additional medium, by means of which the content of noxious substances resulting from burning of the fuel can be decreased. Said second valve (4) comprises an elongated valve member (5) movable within a valve body (2) against the force of a spring (12) and in association with the part of which located on the cylinder side there is arranged a chamber (6), which encircles the valve member (5) and into which said additional medium is arranged to be fed continuously under pressure. Said chamber (6) is limited at its end away from the cylinder to a step made in the valve member (5) and serving as a piston surface (7) and being so dimensioned that the mere pressure of the additional medium fed into the chamber (6) is not sufficient as such in order to open the valve (4) for effecting injection. In addition the arrangement comprises a control valve (27) controlled by an electric signal (35) and which, under the influence of the control signal (35), is arranged to effect, together with the pressure of the additional medium acting on the said piston surface (7) in the valve member (5), movement of the valve member (5) into a position opening the valve (4) for injection of the additional medium into the cylinder.

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Vaasa, Finland

Goran Hellen