US 11,851,843 B2
Hydraulic machine
Taerang Jung, Gyeongsangnam-do (KR); Sangmin Gwon, Gyeongsangnam-do (KR); and Sangki Bae, Gyeongsangnam-do (KR)
Assigned to Volvo Construction Equipment AB, Eskilstuna (SE)
Appl. No. 17/601,211
Filed by Volvo Construction Equipment AB, Eskilstuna (SE)
PCT Filed Apr. 5, 2019, PCT No. PCT/KR2019/004087
§ 371(c)(1), (2) Date Oct. 4, 2021,
PCT Pub. No. WO2020/204236, PCT Pub. Date Oct. 8, 2020.
Prior Publication US 2022/0162829 A1, May 26, 2022
Int. Cl. E02F 3/43 (2006.01); E02F 9/22 (2006.01)
CPC E02F 3/435 (2013.01) [E02F 9/2203 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A hydraulic machine comprising:
a controller;
a tank;
a working device comprising a boom;
a boom cylinder actuating the boom and comprising a large chamber and a small chamber;
a floating hydraulic circuit connected to the large chamber, the small chamber, and the tank to perform a floating function enabling the large chamber, the small chamber, and the tank to communicate with each other; and
an operator input device coupled to the controller, the operator input device receiving a request to activate or deactivate the floating hydraulic circuit, input by an operator,
wherein, in a boom-down operation in which the boom is lowered, the controller determines whether or not the working device is hanging in the air, and when the working device is determined to be hanging in the air, deactivates the floating hydraulic circuit even when the request to activate the floating hydraulic circuit is input to the operator input device.