Crt Common Rail Technologies, Ag

Severin Kern

Marco A Ganser

Roland Kolb

Markus Tappolet

Andreas Carelli

The control space of the fuel injection valve is delimited, on the one hand, by the piston of the injection-valve member, on the other hand by the slide-valve body and circumferentially by the sleeve. Both the double-acting piston and the slide-valve body are guided in a narrow sliding fit on the sleeve. The throttle passage runs through the slide-valve body and is flow-connected permanently to the control passage in the control body. The throttle inlet leads from the high-pressure space into the control passage. The latter, on the side facing away from the slide-valve body, can, via a pilot valve, be connected to a low-pressure space and be separated again from the latter. The connection of the control passage to the low-pressure space leads to a pressure drop in the control space, with the result being that the injection-valve member moves in the direction of the slide-valve body and releases the injection nozzles. After the control passage has been separated from the low-pressure space, as a result of the pressure difference in the control space and on that side of the slide-valve body which faces away from the latter, the slide-valve body, together with the injection valve, is moved in a direction away from the control body, thus leading to a rapid closing of the injection nozzles. Under the force of the spring element, the slide valve body then again sealingly engages the control body.

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Winterthur, Switzerland

Severin Kern