Invention Application
- Patent Title: ELECTRO-HYDRAULIC SYSTEM FOR CONTROLLING MULTIPLE FUNCTIONS
- Patent Title (中): 用于控制多功能的电液系统
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Application No.: PCT/US2012/027679Application Date: 2012-03-05
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Publication No.: WO2012125320A1Publication Date: 2012-09-20
- Inventor: FRANZONI, Germano , HARSIA, Jarmo , LOWMAN, Roger
- Applicant: FRANZONI, Germano , HARSIA, Jarmo , LOWMAN, Roger , PARKER HANNIFIN CORPORATION
- Applicant Address: 23042 N. Main Street Prairie View, Illinois 60069 US
- Assignee: FRANZONI, Germano,HARSIA, Jarmo,LOWMAN, Roger,PARKER HANNIFIN CORPORATION
- Current Assignee: FRANZONI, Germano,HARSIA, Jarmo,LOWMAN, Roger,PARKER HANNIFIN CORPORATION
- Current Assignee Address: 23042 N. Main Street Prairie View, Illinois 60069 US
- Agency: CLARK, Robert et al.
- Priority: US61/453,644 20110317; US61/453,686 20110317
- Main IPC: F15B11/16
- IPC: F15B11/16
Abstract:
Electro-hydraulic systems (10, 110, 210, 310, 410, 510, 610 and 710) control multiple hydraulic motors without objectionable erratic or jerky motion. The system (10) includes a variable displacement pump (20), an electronic controller (30), a direction control valve (40), first and second pump outlet valves (60) and (70), and a fluid reservoir (80). The pump (20) does not require or use a load feedback signal to control pump output. The controller (30) provides electric control signals to a pump control (21) and to individual hydraulic motors (51). A load sense circuit (46) resolves a highest load sense pressure Ps, which is communicated to the first and second pump outlet valves (60) and (70). The first pump outlet valve (60) limits the maximum load sense pressure. The second pump outlet valve (70) limits the maximum pressure differential between the pump outlet and the load sense pressure.
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