Hybrid construction machine

A hybrid construction machine comprising:

• an engine;
• a generator-motor configured to make a generator action and a motor action;
• a hydraulic pump configured to be driven by the engine;
• a hydraulic actuator configured to be operated by the hydraulic pump as a hydraulic pressure source;
• an actuator regeneration section configured to make a regenerative action of generating actuator regenerated-electric-power through return fluid from the hydraulic actuator;
• an electric storage device capable of being charged and discharging electric power stored therein;
• a charging-rate detector configured to detect a charging rate of the electric storage device;
• and
• a control section configured to perform:
• causing the electric storage device to be charged with electric power generated by the generator-motor through the generator action and the actuator regenerated-electric-power generated by the actuator regeneration section through the regenerative action;
• causing the generator-motor to make the motor action through electric power stored in the electric storage device to thereby assist the engine;
• and a regeneration control of stopping the generator action of the generator-motor and restricting the actuator regenerated-electric-power to be generated by the actuator regeneration section when the charging rate of the electric storage device detected by the charging-rate detector is equal to or greater than a preset charging-rate limitation value.