Abstract
An automatic contolled vehicle (ROBOTRA) for the tilling robot was constructed by modifying a commercial tractor (23.5kW) and by installing a controller to the vehicle. To evaluate the performance of the tilling robot, we established a evaluation tests method. The evaluation tests consist of a work performance test to check the efficiency and accuracy of the unmanned operation, a handling test to check the use and the safety of operation, and so on. We executed the evaluation tests with three navigation systems by comparing to the conventional manual work. We found that the tilling robot can perform unmanned tilling in the rectangular field area of 50×100m at almost the same efficiency and accuracy as the manual work. In the straight running performance, the robot operation was superior to the manual work.