Patent ID: 7886862

Claim:
A prime mover control device of a construction machine that includes: a hydraulic pump driven by a prime mover; an actuator driven with pressure oil discharged from the hydraulic pump; and a control valve that controls a flow of the pressure oil from the hydraulic pump to the actuator in response to an operation of a first operating member, comprising: a first set device that sets a first set rotation speed of the prime mover according to the operation of the first operating member; a second set device that sets a second set rotation speed of the prime mover according to an operation of a second operating member; a selection member that selects one of a first mode and a second mode, in the first mode a rotation speed of the prime mover is set according to either the operation of the first operating member or the operation of the second operating member, and in the second mode the rotation speed of the prime mover is set according to the operation of the second operating member regardless of the operation of the first operating member; and a rotation speed control device that controls the prime mover rotation speed to match with a maximum value between the first set rotation speed and the second set rotation speed when the selection member selects the first mode, and that controls the prime mover rotation speed to match with the second set rotation speed when the selection member selects the second mode.