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Gewählte Master / Diploma Thesis:

Franz Frassl (2008): Untersuchungen zum Einfluss von Lastschaltgetriebe und "stufenlosem" Getriebe auf den Kraftstoffverbrauch bei Bodenbearbeitung und Transport.
Master / Diploma Thesis, BOKU-Universität für Bodenkultur, pp 89. UB BOKU obvsg

Data Source: ZID Abstracts
Abstract:
Tractors with continuously variable transmission (CVT) are shown by the suppliers as fuel efficient. Within the scope of this work the fuel consumption was examined by two tractors with different transmissions (power shift transmission, continuously variable transmission) by heavy soil tillage with heavy cultivator (4,7 m) and subsoiler (3 m) and by the transport of 24,85 t of total weight on an level street. The investigations were carried out at the experimental farm of the University of Natural Resources and Applied Life Sciences, Vienna in Groß Enzersdorf. Every single test variation with different driving strategies was repeated three times to be able to secure the results statistically. With the heavy cultivator the tractor with CVT needs a middle significant additional consumption per hectare of 14.9 % or 0.93 l/ha. With the subsoiler the additional consumption amounted on average to 13.7 % or 1.37 l/ha in comparison to the tractor with power shift transmission. Another test variant was maximise the driving speed with a certain engine speed. The additional consumption with the tractor with the CVT decreased with the heavy cultivator to 0.63 l/ha or 8.7 %. With the subsoiler the difference amounted to 6.2 % in flavour of the tractor with power shift transmission. With the collected data the influence of the driving strategy (driving speed and engine speed) could be also examined for the fuel consumption. The driving strategy has a substantially higher influence on the fuel consumption than the transmission type. The investigations for the transport activity showed that the tractor with the CVT had a fuel consumption lower about 6.3 % per drive in comparison to the tractor with power shift transmission. If the maximum speed is reduced from 50 km/h to 40 km/h with CVT, the saving potential amounts to 24 %. At transport activities the tractor with CVT could achieve advantages in fuel saving.

Beurteilende(r): Weingartmann Herbert

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