| 摘要 |
PROBLEM TO BE SOLVED: To provide a construction machine capable of suppressing occurrence of hunting in operation control of an engine.SOLUTION: This invention includes a load estimating section 45 for estimating pump absorbing power P, a regeneration/power running requirement calculating section 46 for calculating regeneration/power running requirement power Q in accordance with a charging condition of a battery 34, an engine requirement calculating section 47 for calculating engine requirement power L based on the pump absorbing power P and the regeneration/power running requirement power Q, and a motor generator control section 48 for performing engine speed control or torque control. The motor generator control section 48 includes a control switch section 48A for switching between engine speed control and torque control in accordance with the engine requirement power L and engine speed of an engine 15, and the control switch section 48A switches from torque control to engine speed control when the engine requirement power L is increased and the engine speed of the engine 15 is lower than engine speed Nmin during torque control.SELECTED DRAWING: Figure 3 |
