公开(公告)号：US10408238B2

公开(公告)日：2019-09-10

申请号：US15808373

申请日：2017-11-09

Applicant: Eaton Intelligent Power Limited

Inventor： Meng Wang ,  Michael Berne Rannow

IPC: F16D31/02 ,  F15B13/04 ,  F15B13/044 ,  F15B11/00 ,  F15B21/02 ,  F15B21/08 ,  F16K37/00 ,  F15B11/08 ,  G01F1/36 ,  G01F15/00

Abstract: Systems and methods for controlling valve assemblies associated with an actuator in an electro-hydraulic system are disclosed. In one method, a controller monitors hydraulic fluid flow for an actuator to identify one valve assembly connected to the actuator as a meter-in valve and another valve assembly connected to the actuator as a meter-out valve. In one aspect, the valve assembly most recently identified as the meter-in valve is controlled to maintain a pressure setpoint and the valve assembly most recently identified as the meter-out valve is controlled to maintain a hydraulic fluid flow rate. The method can also include determining whether the actuator is in a passive state or an overrunning state and controlling the valve most recently identified as the meter-in valve to maintain a first pressure setpoint when the actuator is in a passive state and to maintain a second pressure setpoint when the actuator is in an overrunning state.

公开(公告)号：US10323663B2

公开(公告)日：2019-06-18

申请号：US15326395

申请日：2015-07-15

Applicant: Eaton Intelligent Power Limited

Inventor： Meng Wang ,  Michael Berne Rannow

IPC: F15B15/24 ,  F15B21/00 ,  B66C13/06 ,  F15B11/00 ,  F15B11/044 ,  E04G21/04 ,  F15B11/042 ,  F16K31/42 ,  F15B19/00

Abstract: A hydraulic system (600) and method for reducing boom dynamics of a boom (30), while providing counter-balance valve protection, includes a hydraulic actuator (110), first and second counter-balance valves (300, 400), first and second independent control valves (700, 800), and first and second blocking valves (350, 450). The actuator includes first and second corresponding chambers. In a first mode, the second counter-balance valve is opened by the first control valve, and the first counter-balance valve is opened by the second control valve. In a second mode, at least one of the counter-balance valves is closed. A meter-out control valve (800, 700) may be operated in a flow control mode, and/or a meter-in control valve (700, 800) may be operated in a pressure control mode. Boom dynamics reduction may occur while the boom is in motion (e.g., about a worksite). By opening the counter-balance valves, sensors at the control valves may be used to characterize external loads. The control valves may respond to the external loads and at least partially cancel unwanted boom dynamics. The system may further detecting faults in actuators with counter-balance valves and prevent any single point fault from causing a boom falling event and/or mitigate such faults.