US 12,146,294 B2
Method of controlling a hydraulic actuator, a hydraulic actuator, a hydraulic system and a working machine
Mika Sahlman, Tampere (FI); and Kim Heybroek, Kvicksund (SE)
Assigned to VOLVO CONSTRUCTION EQUIPMENT AB, Eskilstuna (SE)
Appl. No. 17/638,849
Filed by VOLVO CONSTRUCTION EQUIPMENT AB, Eskilstuna (SE); and NORRHYDRO OY, Rovaniemi (FI)
PCT Filed Aug. 30, 2019, PCT No. PCT/EP2019/073256
§ 371(c)(1), (2) Date Feb. 27, 2022,
PCT Pub. No. WO2021/037382, PCT Pub. Date Mar. 4, 2021.
Prior Publication US 2022/0298751 A1, Sep. 22, 2022
Int. Cl. E02F 9/22 (2006.01); F15B 11/036 (2006.01); F15B 21/08 (2006.01)
CPC E02F 9/2203 (2013.01) [E02F 9/2267 (2013.01); E02F 9/2292 (2013.01); E02F 9/2296 (2013.01); F15B 11/036 (2013.01); F15B 21/087 (2013.01); F15B 2211/7055 (2013.01); F15B 2211/76 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A method of controlling a hydraulic actuator, wherein the hydraulic actuator comprises:
a linear double-acting output member, and
at least three working chambers in fluid connection with the output member, the working chambers having respective effective areas with a non-binary relationship;
wherein the method comprises:
selectively fluidly connecting each working chamber to either a high-pressure side or a low-pressure side to provide a plurality of discrete pressurization states of the hydraulic actuator;
characterized in that the method further comprises
determining at least one of the pressurization states as a prevented pressurization state; and
transitioning between a plurality of allowed pressurization states among the pressurization states while preventing transition to the at least one prevented pressurization state.