It is presented a new approach to evaluate tractor efficiency. Data collected by conventional static bench-tests is computed and converted into an operational efficiency. The diagnostic is better oriented to a considered field operation. Typical working dynamics are assimilated to a square profile which characteristics (magnitudes and durations) were determined by analysis of the data collected during a long term data acquisition campaign. Once identified, a model of consumption is used to predict hourly consumption over line and maneuver operation. This model is fitted over tests points run on an engine test bench. Later, by setting a field length, an implement width, a maneuver duration and a tractor speed, it is possible to generate operational efficiency indicators consisting in field efficiency and area specific consumption. The reconstructed efficiency corresponds to measured efficiency, validating thereby the approach considering the square profile for this operation. To evaluate the effect of the working parameters (speed, implement width) on the operational efficiency, a model converting a draft force into an engine consumption has been proposed. This model takes into account a transmission efficiency which sensitivity to the employed lubricant has been investigated. For the tested gear, fuel economy lubricants can enhance the transmission efficiency by 2 %. The sensitivity analysis showed a high dependence of the engine running point setting to the tractor speed and transmission efficiency. A set of field oriented test points is available for testbench operations, but varying operational parameters can be considered. Higher speed increases draft and therefore the power required to operate the implement. This makes the area specific consumption highly speed dependant, field efficiency as well. Finally, the sensitivity to transmission efficiency is studied: any possible improvement of efficiency brought by lubricants used in the transmission box perceptibly impacts the area specific consumption.
Monitoring tractor field working dynamics to optimize fuel economy lubricants
Lastkollektivermittlung eines Traktors als Hilfe zur Entwicklung von energieeffizienten Ölen
ATK, Antriebstechnisches Kolloquium, 15 ; 309-325
2013
17 Seiten, 8 Bilder, 14 Quellen
Conference paper
English
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