Patent ID: 8467934

Claim:
A controller of a hybrid construction machine, comprising: a main pump of a variable displacement type that is connected to a circuit system including a plurality of operated valves, a regulator provided in the main pump for controlling a tilt angle of the main pump, a pilot passage provided in the circuit system for guiding a pilot pressure produced when switching operation is performed on any of the operated valves, a pressure sensor provided in the pilot passage for detecting a pilot pressure, wherein the pilot passage provided in the circuit system is connected to the regulator provided in the main pump, a sub pump of a variable displacement type that is driven off output of an electric motor and connected to a discharge side of the main pump, a tilt-angle control unit provided in the sub pump for controlling a tilt angle of the sub pump, and a control unit provided in the sub pump for controlling the tilt-angle control unit, wherein the pressure sensor is connected to the control unit, and the control unit controls a tilt angle of the sub pump in response to a pressure signal from the pressure sensor.