POWER SOURCE DEVICE FOR WORKING MACHINE

摘要

Power distribution of an engine and an electric power storage device is determined according to a charge amount of the power storage device, and the charge amount of the power storage device is maintained in an adequate range. A power source device for working machines includes a hydraulic pump (3), a generator-motor (4), an engine (1), serving as a common power source, to which the hydraulic pump and the generator-motor are connected parallel, and a battery (7), serving as an electric power storage device, for storing a power thereof by the generator function of the generator-motor (4). The generator-motor (4) is driven by a discharge power of the battery (7) to perform the motor function. Using a controller (8), the power distribution of the engine (1) and the generator-motor (4) is determined based on the required actuator power, the charge power and the discharge power of the battery which are set according to the battery charge amount in such a way that the battery charge amount is maintained in a predetermined range, and on the preset engine power.