<；P>；PROBLEM TO BE SOLVED: To reduce fuel consumption, without having to decrease the threshing treatment performance of a combine harvester, by detecting the engine load conditions from fuel consumption to change running speed so that the load remains constant. <；P>；SOLUTION: A running speed controlling means (2) for controlling the running speed of a machine body, an engine control means (4) for controlling output of an engine (3) by controlling fuel supply corresponding to the load, and a fuel supply detecting means (5) for detecting fuel supply in real time, are provided. Additionally, a fuel control means (6), which controls the running speed, by the running speed control means (2) so that the fuel consumption detected by the fuel supply detecting means (5) is fitted within a predetermined range, is provided. <；P>；COPYRIGHT: (C)2008,JPO&INPIT
