Method for controlling a hybrid construction machine and hybrid construction machine

摘要

A method of controlling a hybrid construction machine, which is supplied with an internal combustion engine (2) and a generator (3) coupled to each other, a swing motor (9), the electric power from the generator motor (3), for pivoting a part of a body in With respect to other parts, a capacitor (6) for storing the power generated respectively by the generator motor (3) and the swing motor (9) and supplying the electric power to the generator motor (3) and the swing motor (9), and an amplifier (8) for boosting the voltage of the capacitor (6) for output thereof, the method comprising: a assist torque limiting value calculating step of calculating an assist torque limiting value of the generator motor (3) corresponding to a capacitor voltage of the capacitor (6) when the amplifier (8) performs an output in connection with discharging the capacitor (6), a generator motor torque command value calculating step of calculating a torque command value of the generator motor (3) according to a target rotational speed of the generator motor (3), and a step of generating an actual generator motor torque command value of comparing the assist torque limiting value calculated in the assist torque limiting value calculating step the torque command value calculated in the generator motor torque command value calculation step, and generating an actual torque command value of the generator motor (3) by using the smaller of the assist torque limiting value and the torque command value.