Abstract
We developed a system that indicates the operating conditions to drivers to reduce fuel consumption in work with agricultural tractors. In this paper, we reported the results of the fundamental tests and outlined the prototype system. In the fundamental tests, we detected the engine speed and emission gas temperature of the tractor using a rotating sensor and a thermocouple. By grouping engine speed data into 100rpm increments, we found that the working power can be estimated from the measured engine speed and emission gas temperature. The prototype system employed five operating areas according to the engine speed and working power. The system was designed to indicate to change the operating conditions (traveling speed gear, PTO gear and engine speed) so that the tractor operates in the area that enables high fuel efficiency and low exhaust smoke density. To ensure that the work accuracy does not change, indicated traveling speed and PTO speed were almost the same as the former value of them.
