| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve fuel consumption of an engine in a crane device. <P>SOLUTION: An operation mode is switched to an operation mode A of supplying electric power to loads 30 and 40 from a battery 52, an operation mode B of charging the battery 52 by regenerative electric power regenerated from the load 30, an operation mode C of supplying the electric power to the loads 30 and 40 from an engine generator 21 and the battery 52 and an operation mode D of charging the battery 52 from the engine generator 21. In the operation mode C, a discharge current from the battery 52 and a generated current from the engine generator 21 are supplied to the loads 30 and 40. When transferring to the operation mode C from the operation mode A, a power supply balance by the discharge current of the battery 52 and a generator current of the engine generator 21 corresponding to the battery charging ratio SOC and the size of the loads 30 and 40 (for example, the load sharing ratio of the battery 52 and the engine generator 21) is preset before increasing the load. <P>COPYRIGHT: (C)2012,JPO&INPIT |
