US 12,473,710 B2
Construction machine and control method thereof
Byungil Kang, Incheon (KR)
Assigned to HD HYUNDAI INFRACORE CO., LTD., Incheon (KR)
Appl. No. 18/017,728
Filed by HD HYUNDAI INFRACORE CO., LTD., Incheon (KR)
PCT Filed Jul. 22, 2021, PCT No. PCT/KR2021/009514
§ 371(c)(1), (2) Date Jan. 24, 2023,
PCT Pub. No. WO2022/019691, PCT Pub. Date Jan. 27, 2022.
Claims priority of application No. 10-2020-0092351 (KR), filed on Jul. 24, 2020.
Prior Publication US 2023/0287650 A1, Sep. 14, 2023
Int. Cl. E02F 3/43 (2006.01); E02F 9/22 (2006.01); F15B 1/04 (2006.01); F15B 13/04 (2006.01)
CPC E02F 3/435 (2013.01) [E02F 9/2203 (2013.01); E02F 9/2217 (2013.01); E02F 9/2267 (2013.01); E02F 9/2275 (2013.01); E02F 9/2296 (2013.01); F15B 1/04 (2013.01); F15B 13/04 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A construction machine, which comprises a boom, the construction machine comprising:
a boom cylinder configured to move the boom upward or downward and comprises a head side and a rod side;
a boom regeneration valve configured to control a flow rate of a working fluid discharged from a head side of the boom cylinder;
an operating device configured to generate an operating signal for operating the boom;
an accumulator configured to store the working fluid discharged from the boom cylinder;
a regeneration motor configured to produce renewable energy by performing a regenerative operation by using the working fluid discharged from the boom cylinder or the working fluid discharged from the accumulator; and
a control device configured to correct an opening area of the boom regeneration valve on the basis of pressure of the accumulator when the boom descends,
wherein the control device is configured to:
determine a target speed of the boom corresponding to the operating signal of the operating device;
calculate a target passage flow rate at which the working fluid needs to pass through the boom regeneration valve to achieve the target speed; and
calculate the opening area of the boom regeneration valve required to pass the calculated target passage flow rate, and, once the opening area is calculated, transmit a control command to the boom regeneration valve.