US 12,077,941 B2
Hydraulic control system, work machine and method for controlling operation of a work attachment
Carlo Struss, Hannover (DE); and Christian Hahn, Hannover (DE)
Assigned to KOMATSU LTD., Tokyo (JP)
Appl. No. 17/044,429
Filed by KOMATSU LTD., Tokyo (JP)
PCT Filed Mar. 12, 2019, PCT No. PCT/JP2019/009887
§ 371(c)(1), (2) Date Oct. 1, 2020,
PCT Pub. No. WO2019/207987, PCT Pub. Date Oct. 31, 2019.
Claims priority of application No. 18169532 (EP), filed on Apr. 26, 2018.
Prior Publication US 2021/0032849 A1, Feb. 4, 2021
Int. Cl. E02F 9/20 (2006.01); E02F 3/34 (2006.01); E02F 3/43 (2006.01); E02F 9/22 (2006.01); F15B 11/10 (2006.01); F15B 21/08 (2006.01); G05G 13/00 (2006.01)
CPC E02F 9/2041 (2013.01) [E02F 9/2004 (2013.01); E02F 9/2025 (2013.01); E02F 9/2221 (2013.01); E02F 9/2228 (2013.01); E02F 9/2235 (2013.01); E02F 9/2285 (2013.01); F15B 11/10 (2013.01); F15B 21/082 (2013.01); G05G 13/00 (2013.01); E02F 3/34 (2013.01); E02F 3/435 (2013.01); E02F 3/438 (2013.01); E02F 9/2296 (2013.01); F15B 2211/20523 (2013.01); F15B 2211/20538 (2013.01); F15B 2211/20546 (2013.01); F15B 2211/255 (2013.01); F15B 2211/275 (2013.01); F15B 2211/6346 (2013.01); F15B 2211/6355 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A hydraulic control system for controlling operation of a work attachment of a work machine, comprising:
a controller configured to output a work attachment control value controlling the operation of the work attachment,
an operator input device operatively connected to the controller, wherein the operator input device is configured to output a command signal depending on an amount of actuation of the operator input device for setting the work attachment control value,
a mode select input device operatively connected to the controller and configured to select a first mode and a second mode, and
a save input device operatively connected to the controller, wherein the save input device is configured to generate a save command signal upon actuating the save input device,
wherein the controller is configured to save a constant work attachment control value, wherein the constant work attachment control value is the work attachment control value as set by the command signal upon receiving the save command signal,
in the first mode, the controller outputs the work attachment control value based on the command signal, and
in the second mode, the controller outputs the constant work attachment control value when the command signal reaches a predetermined threshold.