PROBLEM TO BE SOLVED: To automatically and reliably set a turning start point at which an agricultural working vehicle can reliably turn in a headland.SOLUTION: The device for setting the turning start position of an agricultural working vehicle includes: an original point setting part 1 for setting an original part P as a travel starting point of the agricultural working vehicle 100 based on position information of GPS a reference line setting part 3 for setting a linear reference line L1 from the original point P a moved distance measuring part 4 for measuring a moved distance from the original point P a travel distance measuring part 5 for measuring an actual travel distance of the agricultural working vehicle 100 a distance difference calculating part 6 for calculating the difference between the measured moved distance and the travel distance a turning determination part 7 for determining that the agricultural working vehicle 100 turns a turning determination point setting part 8 for setting a turning determination point P2 at a position where turning of the agricultural working vehicle 100 is determined a linear reference point setting part 9 for setting a linear reference point P3 at an any point on the reference line L1 and a turning start position setting part 10 for setting a final position as a turning start position P4 by returning back from the turning determination point P2 to the reference line L1 and detecting the final point without having the distance difference on the reference line L1.COPYRIGHT: (C)2012,JPO&INPIT【課題】農作業車が枕地において確実に旋回できる旋回開始位置を自動的、且つ確実に設定する。【解決手段】GPSによる位置情報に基づいて、農作業車100の走行起点とする原点Pを設定する原点設定部1と、原点Pから直線状の基準線L1を設定する規準線設定部3と、原点Pからの移動距離を計測する移動距離計測部4と、農作業車100の実際の走行距離を計測する走行距離計測部5と、計測された移動距離と走行距離との差を算出する距離差算出部6と、農作業車100が旋回していると判定する旋回判定部7と、農作業車100の旋回が判定された位置に旋回判定点P2を設定する旋回判定点設定部8と、規準線L1上の任意の位置に直線基準点P3を設定する直線基準点設定部9と、旋回判定点P2から規準線L1に戻って、規準線L1上の距離差がない最終地点を検出し、この最終地点を旋回開始位置P4として設定する旋回開始位置設定部10とを備えた。【選択図】図1
