Prime mover control device of construction machine

摘要

A prime mover control device of a construction machine according to the present invention includes a hydraulic pump ( 11 ) driven by a prime mover ( 40 ), a hydraulic traveling motor ( 5 ) driven with pressure oil output from the hydraulic pump ( 11 ), and a control valve ( 12 ) that controls a flow of the pressure oil from the hydraulic pump ( 11 ) to the hydraulic motor ( 5 ) in response to an operation of an operating member ( 22 a). The prime mover control device further includes a deceleration detection means ( 31 ) that detects a deceleration operation at the operating member ( 22 a), a rotation speed detection means ( 35 ) that detects a rotation speed Nm of the hydraulic motor ( 5 ), and a prime mover rotation speed control means ( 30,43 ) that executes speed reduction control of the rotation speed of the prime mover ( 40 ) based upon detection results provided by the rotation speed detection means ( 35 ) if the deceleration operation is detected by the deceleration detection means ( 31 ) and controls the rotation speed of the prime mover ( 40 ) in correspondence to an operation of the operating member ( 22 a) which is detected to be other than the deceleration operation.