Controller of hybrid construction machine

A controller of a hybrid construction machine, comprising:

• a variable displacement type of a main pump;
• a regulator for controlling a tilt angle of the main pump;
• a boom cylinder;
• a boom operated valve connected to the main pump;
• a sensor detecting a manipulated direction and a manipulated variable of the boom operated valve;
• operated valves connected to the main pump, as well as the boom operated valve;
• a proportional solenoid valve provided between a piston chamber of the boom cylinder and the boom operated valve;
• a variable displacement type of a sub pump connected to a discharge side of the maim pump, a tilt angle of the sub pump being controlled by a tilt-angle control unit;
• a variable displacement type of an assist motor connected to a upstream side of the proportional solenoid valve with respect to a return flow from the boom cylinder, and actuated by the return flow, an tilt angle of the assistor motor being controlled by a tilt-angle control unit;
• an electric motor serving also as a generator and allowing coaxial rotation of the sub pump and the assist motor;
• and
• a control unit for controlling the sensor provided in the boom operated valve, the proportional solenoid valve, the tilt-angle control units for the sub pump and the assist motor and the electric motor,
• the control unit comprising:
• a function of receiving a signal output from the sensor provided in the boom operated valve and determining a manipulated direction and a manipulated variable of the boom operated valve, and
• a function of, in accordance with the manipulated direction and the manipulated variable, controlling a degree of opening of the proportional solenoid valve and operating the tilt-angle control units to control the tilt angles of the sub pump and the assist motor,
• wherein an output of the assist motor is used to assist in an output of the sub pump and an output of the electric motor.