New injection nozzle
07 March 2008
The latest development from hatz which helps to reduce levels of NOx, is the rate shaping nozzle (RSN) according to Peter Prinz-Hufnagel, responsible for the company's engine development, combustion and exhaust emissions divisions.
“Before, there were only standard injection nozzles with a blind hole. The disadvantage is that a small residue of fuel remains in the blind hole after injection and this is blown out again in unburned form,” said.
The next stage in development is a tapered blind hole from which today's state-of-the-art technology, the standard multi-hole injection nozzle, devel, Mr Prinz-Hufnagel said.
“Here the injection holes branch off in the area of the nozzle seating and are thus uncovered. This prevents any evaporation of fuel,” he added.
Mr Prinz-Hufnagel said, “The RSN nozzle enables a higher needle stroke and at the same time operates in two stages: initially the nozzle lifts only slightly and ther is only a small quantity of fuel injected. It is only when the pressure increases that the needle stroke is increased and normal injection (full injection) ensues.”
The RSN nozzle is now fitted throughout the B Series and in the Supra series. It is currently under preparation for 2G40 version.