| 摘要 |
PURPOSE:To enable mode change to be made simply at an edge of rice field ridge in a power vehicle with an automatic steering mode by providing the vehicle with a control means by which changeover to a set mode is made possible through cancellation of automatic mode made by operation of one mode setting switch. CONSTITUTION:When an engine of a tractor is started, a front steering mode is selected. At this time changeover is made to a manual mode by pressing an automatic/ manual changeover switch S4 and thereafter the steering mode determined by pushing the switch is obtained. In the case of automatic mode selected, when a working vehicle is raised at a front wheel steering mode, changeover is made to a front/rear wheel reverse phase steering mode, and when the vehicle is lowered without pushing any switch, changeover is made (resumed) to the front wheel steering mode. When any of switches, that is, a front wheel steering switch S1, front and rear steering switch S2 and rear wheel steering switch S3 is pushed during the raising operation of the vehicle, the front/rear wheel reverse phase steering mode is canceled and thus a selected steering mode is carried out. It is thus possible to simplify the steering mode changeover when a working vehicle is raised at an edge of ridge in a rice field. |
