O controle de emissão dos gases expelidos pelos veículos automotores é ponto passivo de preocupação dos governos mundiais nos seus órgãos ambientais. Portanto, este estudo tem como objetivo avaliar a emissão dos gases de descarga expelidos pelo motor ciclo diesel de um trator agrícola. Para tanto, foram aferidas as medições dos índices dos gases (dióxido de carbono ou gás carbônico – CO2 e Óxido de Nitrogênio - NOx), considerando o funcionamento do motor em 5 rotações diferentes e duas temperaturas sendo: abaixo de 60º C e entre 60º a 80º C. Os dados foram analisados por meio da estatística descritiva, pelo método do delineamento experimental inteiramente casualizado com parcelas subdivididas. Pode-se observar que variação da rotação do motor não influenciou nos níveis de emissão dos gases CO e NOX, enquanto que a alteração da temperatura de trabalho do motor apenas influenciou o nível de emissão do CO.
ABSTRACT:The aim of this study was evaluate the longitudinal distribution of maize seeds using a seeding line prototype, whit a microcontroller data acquisition system, at different speeds and types of horizontal feeder discs. Initially it was constructed a prototype simulator of seeding line, in the laboratory, and mounted two systems of microcontroller data acquisitions with infrared sensors for maize seeds counting. A test was conducted in a completely randomized design in split plots with factorial scheme of treatments 5 x 2 x 2, being the parcel two types of microcontroller data acquisition systems (infrared sensors in parallel and an diffuse infrared sensor), the factors were two feeder discs of maize seeds (inclined and normal) and five sowing speeds (3.0, 4.0, 5.0, 6.0, and 8.0 km h -1 ), with three replications, totaling 60 plots. The results showed that the data acquisition systems presented efficiency higher than 93% in the perception of the seeds. The lower speeds provided a seed distribution closer to the desired. The spacing average error between seed with the microcontroller data acquisition system with diffuse sensor was 0.0206 meters and the system with infrared sensors in parallel was 0.0158 meters.
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