| 主权项 |
1. A hybrid work machine, comprising:
an engine (15) configured to drive a hydraulic pump as a hydraulic source of a hydraulic actuator; an engine-assist motor generator (20) attached to the engine (15); an electric motor (50) for use in a part of a driving system of the work machine; an electricity storage device (42) configured to store generated power of the motor generator (20); a power converter (60) disposed between the electric motor (50) and DC buses (80, 81, 80a, 81a); and a buck-boost converter (40, 40a) disposed between the DC buses (80, 81, 80a, 81a) and the electricity storage device (42), and configured to perform power transfer between the DC buses (80, 81, 80a, 81a) and the electricity storage device (42) by raising and lowering a voltage of the DC buses (80, 81, 80a, 81a), the hybrid work machine, further comprises: a controller (70) configured to temporarily raise the voltage of the DC buses (80, 81, 80a, 81a) when a torque required for the electric motor (50) exceeds a torque outputtable at the voltage of the DC buses (80, 81, 80a, and 81a) connected to the power converter (60). |
