HYBRID CONSTRUCTION MACHINE

摘要

Provided is a hybrid construction machine capable of appropriate control of engine speed based on a total load torque, reduction in energy loss due to the power for auxiliary devices and efficient operation of the engine and the generator motor, including a hydraulic pump, a generator motor, an engine, and a control device. The control device includes a total load torque determination section determining a total load torque, the sum of load torques for the hydraulic pump and the generator motor, and an engine speed control section controlling the engine speed based on the total load torque. The engine speed control section performs a regulation control of increasing the engine speed as the total load torque decreases under a high load torque condition and performs an isochronous control of maintaining the engine speed at a constant target speed N2 under a low load torque condition.