US 12,173,789 B2
Hydraulic control device for hydraulic actuation machine, hydraulic control method for hydraulic actuation machine, and non-transitory computer-readable medium
Yuji Oishi, Sagamihara (JP); Keisuke Iwado, Ebina (JP); Hiroyuki Tokoi, Isehara (JP); and Masanori Satou, Tachikawa (JP)
Assigned to JATCO LTD, Fuji (JP); and NISSAN MOTOR CO., LTD., Yokohama (JP)
Appl. No. 18/259,357
Filed by JATCO Ltd, Fuji (JP); and NISSAN MOTOR CO., LTD., Yokohama (JP)
PCT Filed Nov. 26, 2021, PCT No. PCT/JP2021/043380
§ 371(c)(1), (2) Date Jun. 26, 2023,
PCT Pub. No. WO2022/153687, PCT Pub. Date Jul. 21, 2022.
Claims priority of application No. 2021-003952 (JP), filed on Jan. 14, 2021.
Prior Publication US 2024/0052857 A1, Feb. 15, 2024
Int. Cl. F16H 61/00 (2006.01)
CPC F16H 61/0031 (2013.01) [F16H 2061/004 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A hydraulic control device for a hydraulic actuation machine including a main oil pump configured to supply oil to the hydraulic actuation machine, a sub oil pump configured to temporarily supply oil to the hydraulic actuation machine based on a drive request so as to compensate for an oil shortfall when supply of oil from the main oil pump to the hydraulic actuation machine is stopped or insufficient, and an electric motor configured to drive the sub oil pump, wherein
when an elapsed time elapsed from a time point when the sub oil pump is driven reaches a predetermined time, the hydraulic control device generates an air discharge command for discharging air accumulated in the sub oil pump and outputs the air discharge command to the electric motor,
the electric motor drives the sub oil pump to discharge the air accumulated in the sub oil pump based on the output air discharge command, and
the electric motor drives the sub oil pump based on the drive request to temporarily supply oil to the hydraulic actuation machine before the elapsed time reaches the predetermined time.