HYBRID CONSTRUCTION MACHINE

摘要

The purpose of the present invention is to operate an engine in a proper operating state while keeping the remaining energy in an electricity storage device within a proper range. A hybrid construction machine according to the present invention is provided with a controller for controlling an engine in accordance with a governor characteristic having a slope that defines a relationship between load torque and rotating speed so that the rotating speed decreases with an increase in the load torque. In the controller, a target engine power calculator (2-5) calculates a first target engine power that increases and decreases with increases and decreases in output values of a load power calculator (2-1) and a charge-discharge request calculator (2-3), and a target rotating speed calculator (2-6) calculates, as a command value for a target rotating speed for a motor-generator, a rotating speed at the intersection between a governor characteristic line changed by a governor characteristic changer (2-4) and an equal power line dependent on the first target engine power on a rotating speed-torque characteristic line diagram.