The Strength of Air Improves the Efficiency
Source: F.A.Z. from 9 March 1999: One of the largest and most
respected newspapers in Germany.
Translated by babelfish.altavista.digital.com
The supercharger of Turbodyne with electric drive makes also that
thick Diesel speedy legs Around the American enterprise Turbodyne are at the stock exchange some eddies developed. In the meantime it became admits that Turbodyne with save, a large American manufacturer for superchargers cooperates. We
interest us here only for the system of an electrically propelled loading
The time is long past. there truck Diesels with accelerating
black Smoke clouds from the exhaust pushed. Nevertheless are those
Engine engineers also the present status not contently. Around the smoke clouds too
avoid, the injection amount within the critical acceleration area had strongly
are taken back. Among them the early development suffered one
as high ones as possible Torque and therefore the accelerating power. It is
a peculiarity today with almost all diesel engines, also with those for
Passenger vehicle used superchargers that them only with higher engine speed
sufficient Fresh air promote with some diesel engines for person auto
used adjustable guide vanes before the exhaust-gas turbine wheel can that
Problem few lindern, but do not eliminate. Because at low numbers of revolutions
is missing completely turn simply the necessary printing of the exhaust gases, around the turbine more highly to leave.
Naturally applies also to petrol engines with supercharger, with those
those substantially higher exhaust gas temperature still additional barriers
established.
For these reasons Peter Hofbauer develops with Turbodyne
at present, Supercharger with additional electric drive preferably for
small Diesel (F.A.Z. from 1 September 1998). With large diesel engines for
Commercial motor vehicles run the clocks more slowly, model changes find in longer
Intervals instead of as Passenger vehicle. Therefore one looked for solutions, over without profound Modifications in the engine nevertheless a better
Acceleration behavior too achieve. Here an electrically propelled fresh air turbine is offered on, in that Acceleration phase additionally air in the air intake system presses. Such Turbines there are already, it became from Turbodyne first for
Commercial motor vehicle engines into that United States developed, push however also with that European Engine manufacturers on large interest. Thus Hans Zellbeck reported, Professor on the technical University of Dresden, on the Aachener colloquium in passed Autumn, with an electrically supported supercharger would leave itself those Acceleration time around approximately 20 per cent improve. To it
employee Model calculations are acknowledged by practice, like yard farmer
reported - and occasionally even exceeded.
From Turbodyne several sizes of turbineturbine turbines became
developed. Of them largest with the designation 2500 is suitable for heavy
Commercial motor vehicle Diesel particularly well. After switching on on it runs in 0.2 seconds on one Number of revolutions of approximately 40,000 per minute highly. In this extremely short time it takes max. 28 Kilowatt from the electrical system up; those are from the batteries in Commercial motor vehicle however bears perfect. Afterwards the capacity sinks spontaneously, over itself to settle down high air requirement on approximately 5 KW. According to experience the turbine needs only few seconds to run then it their purpose fulfilled and switches itself off, It shifts thus only the combustion engine on to it sufficient exhaust gas supplies, over the supercharger on high number of revolutions and high air delivery too float.
Amount of fuel and air become natural very exactly electronically regulated, so that
despite the substantial acceleration buildup the exhaust gas smokelessly remains. There those Turbine only short time to run must is the dimensions of the
Electric motor extremely, grant. The runner on the turbine shaft has only the thickness one normal Thumb, while the stator fits comfortably into a hand. Because of that
high Capacity when starting is the engine however by thick Copper cable
connected with the battery, and the controller stresses the workstation one
Shoe cardboard. As usual for turbines with high efficiency, is that Turbine
comparatively tiny. The wave turns in continuouslubricated Ceramic(s) ball bearings.
Attempts at more than 100 motorbuses in the United States resulted in in
usual city traffic with countless acceleration and Delay processes
Fuel saving up to 29 per cent - during drastic discharge that Driver those
before difficulties had, itself into flowing traffic to arrange. The penalty
Diesels are equipped, with v-six cylinder-Zweitaktdieseln of Detroit both
a mechanical loader (root blower) and one Superchargers have.
Already after the first attempts yard farmer recommended to that Engine manufacturer, completely on the heavy root blower with its floated on to omit, because
those electrically propelled turbine is better suitable, the air requirement of the engine
with lower To cover number of revolutions and with accelerating from the status. Perhaps those can substantial improvement by the electrical turbine the manufacturer
in addition move, to design the interesting six cylinder engine again, because of
its incomparable cyclic testing in the world is unique. There Detroit Diesel
in the meantime by Daimler Chrysler taken over could yard farmer is in
Stuttgart open Ears find. In driving and in the direct comparison between " without "
and "mit " - eliminates the injectinjecting injecting also the last doubt. The driver
feels neither still power-off off, particularly with the laufgeraeusch of the
Commercial motor vehicle Diesel of the turbine nothing to hear is. From the relatively slow-acting commercial motor vehicle becomes no running horse, for it however a quickly accelerating vehicle that that Driver with Are not positioned into flowing traffic any longer the fear sweat up the forehead floats. If one would not know anything from the turbine in the background, one could on the installation a larger engine believe.
Four-stroke diesel engines react to the electrically propelled Turbine not
differently. By the zusatzluft the efficiency becomes with full load and lower
Number of revolutions raised, which consumption favorably influenced. Here are missing still comparable numbers. Naturally city penalty does not only profit from that
Addition turbine, also long-distance traffic full trailer combinations would draw from it substantial use. There that usable Speed range of the engines is extended, left themselves perhaps even Gears save. Here the development must be waited for.
It becomes still more interesting, if the electrical system voltage of 12 or 24 on (48)
Volt rises, because itself then the conditions for all electric drives in the auto
quite substantially improve. That applies to passenger vehicles and commercial motor vehicles equally, naturally also for vehicles with petrol engines. Only besides is to be mentioned, that loaded petrol engines likewise for zusatzluft in the lower
Speed range gratefully would be. Thus the feared " turbo-hole " became final that
Past belong.
Naturally the higher efficiency of an engine hangs not only of that additional chargecharge charge at low numbers of revolutions off - however it is those
A prerequisite for it. Here thus a development came into course, those already
for the more near future an interesting improvement of our engines promises.
The diesel engine as low-performance engine becomes of it in the next years to
most profit - the commercial motor vehicle engine quite particularly.
Author HCRlcScTcIcAcN BARTSCH
Source: F.A.Z. from 9 March 1999
Translated by babelfish.altavista.digital.com
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