| 摘要 |
A battery charging system and a charging method thereof for a hybrid construction machine using a rotating force of a fan are disclosed. The battery charging system includes a fan, a controller controlling a braking device of the fan and a battery which is charged with electric energy. The charging method includes controlling, by the controller, a braking device of the fan to decrease a fan rotating speed down to a target fan rotating speed if the current target fan rotating speed, which is obtained depending on a current cooling water temperature, a hydraulic fluid temperature, and an engine intake air temperature, is lower than an actually measured fan rotating speed; and charging, by the braking device, electric energy which is caused by a rotating force that is generated while the fan rotating speed is decreased from the actually measured fan rotating speed to the target fan rotating speed in the battery. Since the electric energy generated by the rotating force is stored in the battery, the engine operation time is reduced, and thus a fuel efficiency can be improved. |
