Control Device For Hybrid Construction Machine

A control device for a hybrid construction machine, including

• a variable displacement type of a main pump,
• a circuit system connected to the main pump and including a plurality of operated valves for controlling actuators, and
• an operated valve for controlling a rotating motor provided in the circuit system, comprising:
• a single operation detection unit that detects single operation of the rotating motor;
• a variable displacement type of a sub-pump;
• a tilt angle control unit that controls a tilt angle of the sub-pump;
• an electric motor that is a driving source of the sub-pump;
• a merging passage connected to the sub-pump and communicating with a discharge side of the main pump;
• an assist control input unit that inputs a signal representing whether or not assist control is required in the single operation of the rotating motor;
• and
• a controller that controls the tilt angle of the sub-pump and a rotational speed of the electric motor, wherein
• the controller comprising a function of controlling one of or both a rotational speed of the electric motor and a tilt angle of the sub-pump on the basis of a low output set value which is relatively lower than a low output set value in regular working operations except the single operation of the rotating motor, when the controller receives the signal representing a rotating-motor single operation from the single operation detection unit and receives the signal representing a need for an assist from the assist control input unit.