Disclosed are a hydraulic system, a control method and a working machine. The hydraulic system includes an oil tank, a working pump, a control cylinder controlling a displacement changing mechanism, a working oil line communicating with an output main path of the working pump, a load-sensing system including a load-sensing circuit outputting hydraulic pressure based on load, a load-sensing valve and a switching-control valve switchable between a first-valve-position and a second-valve-position. When differential pressure between the first and second control ports is greater than a first threshold, the output main path communicates with an input port of the control cylinder; when it is less than the first threshold, the input port communicates with an oil return port of the oil tank. Based on this, operators can switch the hydraulic system between the fixed-displacement mode and the fixed/variable-displacement mode, thereby achieving a better balance between energy conservation and performance.
HYDRAULIC SYSTEM SWITCHABLE BETWEEN FIXED-DISPLACEMENT AND FIXED/VARIABLE-DISPLACEMENT, CONTROL METHOD THEREOF AND WORKING MACHINE
2023-09-21
Patent
Elektronische Ressource
Englisch
Hydraulic motor-pump with fixed or variable displacement
Europäisches Patentamt | 2017
|HYDRAULIC MOTOR-PUMP WITH FIXED OR VARIABLE DISPLACEMENT
Europäisches Patentamt | 2020
|SAE Technical Papers | 2006
|Europäisches Patentamt | 2017
|