Patent ID: 7673402
Filing Date: 2010-03-09
Classification: E01H

Abstract:
1. A self-propelled work machine comprising travel units and a work unit in which a load placed on the work unit increases as the travel speed of the travel units increases, the self-propelled work machine further comprising: electric motors for driving the travel units; an engine for driving the work unit; a work drive instruction unit for instructing the work unit to turn on or off; and a control unit for controlling the electric motors, wherein the control unit performs proportional-integral-derivative (PID) control in which the actual speed of the electric motors is reduced so that the actual rotational speed of the engine returns to an engine reference rotational speed when it is determined that two conditions are satisfied from among a condition wherein the instruction of the work drive instruction unit is ON, and a condition wherein the actual rotational speed of the engine is below the prescribed engine reference rotational speed when the work unit is driven by the engine.