Effect of towing load of combustion engines on economic parameters of operation of tractor aggregates

This paper deals with possible ways how to reduce consumption of Diesel oil under conditions of increased performance of tractor aggregates. In laboratory, complete characteristics of John Deere 8300 engine were measured on the power take-of shaft. The same tractor was thereafter used for field experiments with a seven-shares suspended turning plough. Measurements were carried out in the village Jeníčkova Lhota (county Tábor) on a field with loamy-sandy soil of 16.1% average moisture content. The specific volume density of dry soil was 1.48 g/cm3. The following engine parameters were measured: Diesel oil consumption, engine speed, wheel slippage, time interval required for passing through the measured distance and the depth and width of ploughing. Measured values were used for calculation of Diesel oil consumption (amount required for ploughing of 1 cu. m. and the area ploughed up for a unit of time). Tractor ploughed always with the full fuel tank. Measurements were carried out at 1680 - 1850 and 1900 - 2050 revolutions per minute. Obtained results indicate that with 1680 - 1850 rev./min. the average fuel consumption was 6.4 ml/cu. m while with 1900 - 2050 rev./min. it increased to 7.49 ml/cu. m. This means that the saving of fuel was a 17% and the increase in tractor performance 10.8%.

Keywords: tractor-plugh aggregate, performance, fuel consumption, engine speed

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Příspěvek byl vypracován na základě výsledků získaných při řešení projektu VAZV QC 009 "Objektivizace normativů spotřeby pohonných hmot a energie na výrobu zemědělských produktů a tvorba jejich databáze".