| 摘要 |
PURPOSE: A hybrid excavator boom drive system and a control method thereof are provided to minimize energy loss during excavation work, secure the operating performance of a boom, and collect regenerative energy from the boom while using an electric motor. CONSTITUTION: A hybrid excavator boom drive system comprises an electric motor(110), an ultra capacitor(115), a hydraulic pump motor(120), a boom control valve(125), a main pump(140), a first control valve(151), and a second control valve(152). The electric motor is driven with a motor or generator. The ultra capacitor stores the electricity produced by the electric motor. The hydraulic pump motor is driven with the electric motor to provide working fluid to a boom(100). The boom control valve selectively connects or disconnects a discharge line(121) and an intake line(122) of the hydraulic pump motor to or from a head(106) or a rod(107) of the boom. The main pump is driven with an engine(141) to provide working fluid to a bucket, a driving motor, or an arm. |
