Abstract
In cooperation with Adam Opel AG an injection valve with integrated heating was developed at the Institute for Internal Combustion Engines and Automotive Engineering at the Technical University of Vienna.
When fuel is injected into the intake-manifold during the pressure jump a sudden vaporization of low-boiling fuel components (Flash-Boiling Effect) occurs at the injection valve orifice. This is caused by an increase of the fuel temperature.
The flash-boiling-injection-valve was used for several comparative studies both with conventional injection valves as well as with other valve systems, which are supported by external energy. The results of these studies demonstrate a large potential for reducing the unburnt hydrocarbon emissions, especially for cold engine operation. Other advantages of this system are the low demand of energy as well as the easy deactivation of the heating after the warm-up phase.