Hydraulic Systems And Methods To Control A Member

A system to move a member, the system comprising:

• a first pump that delivers hydraulic fluid at a first pressure;
• a second pump that delivers hydraulic fluid at a second pressure;
• a control device comprising an integrated hydraulic actuator and an inerter, the actuator comprising a first chamber and a second chamber, the control device operatively coupled to the member;
• a dual spool valve positioned between the first and second pumps and the control device to direct the hydraulic fluid to and from the first and second chambers;
• supply lines that deliver the hydraulic fluid from the first and second pumps to the dual spool valve;
• and
• return lines that deliver the hydraulic fluid from the dual spool valve to the first pump and the second pump.

A system to control a member, the system comprising:

• a first pump that delivers hydraulic fluid at a first pressure;
• a control device comprising a hydraulic actuator and integrated inerter that is operatively coupled to the member;
• a supply line through which the hydraulic fluid is delivered from the first pump to the control device;
• a second pump that delivers the hydraulic fluid to the control device at a second pressure that is higher than the first pressure;
• a dual spool valve that is positioned between the control device and the first and second pumps, the dual spool valve directs the hydraulic fluid;
• a return line that returns the hydraulic fluid from the control device to the first pump;
• and
• a spare line that extends between the return line and the second pump, the spare line positioned along the return line upstream from the first pump;
• wherein at least a portion of the hydraulic fluid that is supplied to the second pump comprises the hydraulic fluid that is returning along the return line from the control device towards the first pump.

A method of operating a system to control a member, the method comprising:

• positioning a dual spool valve at a first position and supplying hydraulic fluid at a first pressure from a first pump to a control device that is operatively connected to the member, the control device comprising an integrated actuator and inerter;
• returning the hydraulic fluid from the control device to the first pump along a return line;
• in response to a load pressure demand, positioning the dual spool valve at a second position and supplying hydraulic fluid to the control device from a second pump at an elevated pressure that is above the first pressure;
• and
• in response to the load pressure demand, supplying the hydraulic fluid to the second pump from the return line prior to the hydraulic fluid being returned to the first pump.

A method of controlling a control device to move a member, the method comprising:

• positioning a first spool in a first manifold at a second position and opening a supply port in the first manifold and moving hydraulic fluid from a supply line and into a first chamber of a hydraulic actuator and positioning a second spool in a second manifold at a first position and opening a return port in the second manifold and moving hydraulic fluid from a second chamber of the hydraulic actuator to a return line and moving a piston of the hydraulic actuator in a first direction;
• positioning the first spool in the first manifold at a first position and opening a return port in the first manifold and positioning the second spool in the second manifold at the first position and opening the return port in the second manifold and moving hydraulic fluid from the first chamber of the hydraulic actuator through the return port in the first manifold and through the return port in the second manifold and into the second chamber of the hydraulic actuator and moving the piston of the hydraulic actuator in a second direction;
• positioning the first spool in the first manifold at the first position and opening the return port in the first manifold and moving hydraulic fluid from the first chamber to the return line and positioning the second spool in the second manifold to a second position and opening a supply port in the second manifold and moving hydraulic fluid from the supply line and into the second chamber of the hydraulic actuator and moving the piston of the hydraulic actuator in the second direction;
• and
• positioning the first spool in the first manifold at the first position and opening the return port in the first manifold and positioning the second spool in the second manifold to the first position and opening the return port in the second manifold and moving hydraulic fluid from the second chamber of the hydraulic actuator through the return port in the second manifold and through the return port in the first manifold and into the first chamber of the hydraulic actuator and moving the piston of the hydraulic actuator in the first direction;
• while moving hydraulic fluid to the first and second chambers, axially accelerating using an inerter coupled to the control device a first terminal relative to a second terminal simultaneously with an in proportion to actuation of the control device;
• and
• rotationally accelerating a flywheel in the control device in proportion to and simultaneous with the axial acceleration of the first terminal relative to the second terminal.