PROBLEM TO BE SOLVED: To prevent degrading of threshing treatment accuracy by avoiding that a dust-sending guide is uselessly opened and regulated when engine load is increased by traveling load, like in the case where the degree of opening of the dust-sending guide is controlled based only on the engine load.SOLUTION: A combine harvester 1 in which the degree of opening toward a treated material flow route of the dust-sending guide 17 can be changed, includes a dust-sending guide-driving motor 19 for changing the degree of opening of the dust-sending guide 17 by the driving force of an actuator, a control part 39 for controlling the degree of opening of the dust-sending guide 17 through the dust-sending guide-driving motor 19, an engine load sensor 34 for detecting the engine load, and a specific load-detecting means (sensors 35 to 38) for detecting specific loads other than that in a threshing chamber, wherein the control part 39 estimates the load at the threshing chamber 12 based on the detected load of the engine load sensor 34 and the detected load of the specific load-detecting means, and automatically controles the degree of opening of the dust-sending guide 17 according to the estimated load.COPYRIGHT: (C)2013,JPO&INPIT【課題】エンジン負荷のみにもとづいて送塵ガイドの開度を制御するもののように、走行負荷を原因とするエンジン負荷の増大時に送塵ガイドが無駄に開き制御されることを回避し、脱穀処理精度の低下を防止する。【解決手段】送塵ガイド17の処理物流動路に対する開度を変更可能にしたコンバイン1であって、送塵ガイド17の開度をアクチュエータの駆動力で変化させる送塵ガイド駆動モータ19と、送塵ガイド駆動モータ19を介して送塵ガイド17の開度を制御する制御部39と、エンジン負荷を検出するエンジン負荷センサ34と、扱室以外の特定負荷を検出する特定負荷検出手段(センサ35~38)と、を備え、制御部39は、エンジン負荷センサ34の検出負荷と特定負荷検出手段の検出負荷にもとづいて扱室12の負荷を推定し、該推定負荷に応じて送塵ガイド17の開度を自動的に制御する。【選択図】図7
