Patent ID: 9482234
Filing Date: 2016-11-01
CPC Classification: E02F,F04D

Claim Text:
1. A construction machine comprising: an engine with a supercharger; a variable-displacement hydraulic pump driven by the engine; a hydraulic actuator driven by hydraulic fluid discharged from the hydraulic pump; a supercharging pressure detector adapted to detect a supercharging pressure of the supercharger; and a controller adapted to control pump torque, which is absorption torque of the hydraulic pump, the controller being adapted to perform, until engine speed of the engine has risen to reach a target engine speed from engine speed lower than the target engine speed, calculating target pump torque from a predetermined relationship between engine no-load speed set and the target pump torque, correcting the target pump torque so as to make the target pump torque be smaller as the supercharging pressure is lower, on the basis of the supercharging pressure detected by the supercharging pressure detector, and limiting actual pump torque to the corrected target pump torque.