Hybrid working machine and method of controlling hybrid working machine

摘要

A hybrid excavator includes an engine, a generator motor, a capacitor, a swing motor, a transformer, a transformer temperature sensor, a capacitor temperature sensor, and a hybrid controller. An overheat suppression control unit of the hybrid controller changes the amount of power regenerated by the swing motor supplied to the capacitor and the amount of power regenerated by the swing motor supplied to the generator motor based on a temperature of the transformer detected by the transformer temperature sensor and a temperature of the capacitor detected by the capacitor temperature sensor.

主权项

1. A hybrid working machine comprising:
an internal combustion engine; a generator motor which is connected to an output shaft of the internal combustion engine; a battery which stores power generated by the generator motor and supplies the power to the generator motor; an electric motor which is driven by at least one of the power generated by the generator motor and the power stored in the battery; a transformer which is installed between the battery and the generator motor and between the battery and the electric motor; a transformer temperature detecting sensor which detects a temperature of the transformer; a battery temperature detecting sensor which detects a temperature of the battery; a voltage sensor which detects a voltage of the battery; and an overheat suppression control device which obtains a first transformer input limit power corresponding to the voltage detected by the voltage sensor and changes the amount of the power regenerated by the electric motor supplied to the battery and the amount of the power regenerated by the electric motor supplied to the generator motor based on the temperature of the transformer detected by the transformer temperature detecting sensor and the temperature of the battery detected by the battery temperature detecting sensor and the first transformer input limit power, and wherein the overheat suppression control device changes the amount of the power regenerated by the electric motor supplied to the battery and the amount of the power regenerated by the electric motor supplied to the generator motor based on a magnitude relation of a first power running output that is determined based on voltage of the battery and allow the generator motor to perform power running and a second power running output that is determined based on input and output power of the electric motor and battery side input limit power based on the temperature of the battery and the temperature of the transformer and allow the generator motor to perform power running.