POWER CONTROL APPARATUS AND POWER CONTROL METHOD FOR CONSTRUCTION MACHINERY

摘要

An aspect of the present invention provides a power control apparatus of a construction machine, including: an engine (10) connected to a hydraulic pump (20) to drive the hydraulic pump (20); and a controller (60) for calculating an engine load ratio defined as a ratio of a load torque of the engine for an engine maximum torque calculated from an input engine target RPM, and calculating an engine RPM command value according to the engine load ratio such that the engine is driven at the target RPM to output the calculated engine load ratio and engine RPM command value to the engine. Another aspect of the present invention provides a power control apparatus of a construction machine for controlling a hydraulic pump (20) driven by an engine (10), including: a horse power regulating unit (30) for varying a swash plate angle of the hydraulic pump (20) to vary a required horse power of the hydraulic pump (20); a pressure sensor (50) for detecting a load pressure (Pd) of a working fluid discharged from the hydraulic pump (20); and a controller (60) for calculating a target pump requiring horse power from the load pressure (Pd) detected by the pressure sensor (50), and controlling a horse power regulating unit (30) such that a required horse power of the hydraulic pump (20) gradually approaches the target pump requiring horse power for a preset time (”t).