Analysis of energetic parameters of John Deere 6620 agricultural tractors

Measurement of energetic parameters is one of the most important factors enabling efficient exploitation of agricultural tractors. Knowledge of these parameters is necessary for assessment of vehicle work economics but also enables determination of its present technical condition. Goal of this work was determination of energetic parameters of John Deere 6620 agricultural tractors. Courses of external characteristics of torque M(oz), power N(ez), hourly Gc and unitary fuel consumption g(ez) were determined. Research concerned tractors equipped with straight 6 cylinder engine powered by dispenser supply system or by distributor injection pump with turbocharger and intercooler. Tractor engine energetic parameters obtained as a result of such investigations enable evaluation of energetic "saturation" of a tractor. Mainly its energy consumption and ability to work in changing work conditions including changes of load and rotation speed.