PROBLEM TO BE SOLVED: To provide a combine harvester equipped with three or more ground height detection sleigh bodies which can prevent taking in of soil and can simultaneously horizontally be controlled, and to provide a ground height control program therefor.SOLUTION: At least three or more ground height detection sleigh bodies are separately disposed, and independently detect ground heights, respectively. The ground height detection sleigh bodies 36L, 36R respectively arranged at the right and left ends have horizontal control means for ridges. The ground height detection sleigh body 36C arranged at the center has a reaping height control means. The horizontal control means performs ground height control on the basis of the detection values of the maximum and minimum heights at the right and left ridges. The reaping height control means controls the lifting or lowering of the reaping section on the basis of the detection value of the maximum height at the three row ridges.COPYRIGHT: (C)2011,JPO&INPIT【課題】土の取り込みを防止しつつ水平制御を行うことができる3つ以上の対地高さ検出用ソリ体を備えたコンバイン及び対地高さ制御プログラムを提供する。【解決手段】対地高さ検出用ソリ体を少なくとも3個以上別々に配設し、それぞれが独立して対地高さを検出する。そして、左右端に位置する対地高さ検出用ソリ体36L、36Rは、畝に対する水平制御手段を有し、また、中央に位置する対地高さ検出用ソリ体36Cは、刈り高さ制御手段を有する。さらに、前記水平制御手段は、左右の畝における最大高さと最小高さの各検出値をもとにして対地平行制御を行い、また、前記刈り高さ制御手段は、3条の畝における最大高さの検出値をもとにして前記刈取部の昇降制御を行う。【選択図】図24
