Hydraulic system and method for reducing boom bounce with counter-balance protection

A hydraulic valve set comprising:

• a first counter-balance valve providing a first back-flow protection to a first node, the first counter-balance valve including a first counter-balance valve opening node;
• a second counter-balance valve providing a second back-flow protection to a second node, the second counter-balance valve including a second counter-balance valve opening node;
• and
• a selection valve arrangement fluidly connected to the first node, the second node, the first counter-balance valve opening node, and the second counter-balance valve opening node, the selection valve arrangement adapted to self-configure in response to a net spool force produced by a first fluid pressure of the first node and a second fluid pressure of the second node;
• wherein when the net spool force is in a first direction the selection valve arrangement connects the first node of the first counter-balance valve to the second counter-balance valve opening node of the second counter-balance valve;
• and
• wherein when the net spool force is in a second direction the selection valve arrangement connects the second node of the second counter-balance valve to the first counter-balance valve opening node of the first counter-balance valve.

A hydraulic boom control system comprising:

• a pair of counter-balance valves hydraulically coupled to opposite sides of a hydraulic actuator of a boom;
• a selection valve arrangement the selection valve arrangement sensing a net unloaded side of the opposite sides of the hydraulic actuator and opening a one of the pair of counter-balance valves corresponding to the net unloaded side;
• and
• a pair of control valves corresponding to the opposite sides of the hydraulic actuator, a one of the pair of control valves corresponding to the net unloaded side transmitting a vibratory hydraulic fluid flow to the net unloaded side of the hydraulic actuator.

A method of controlling vibration in a boom, the method comprising:

• providing a hydraulic actuator including a first chamber and a second chamber;
• selecting one of the first chamber and the second chamber as a locked chamber;
• selecting another of the first chamber and the second chamber as a dynamically pressurized chamber;
• locking the locked chamber;
• and
• transmitting vibrating hydraulic fluid to the dynamically pressurized chamber.

A hydraulic system for actuating a boom, the hydraulic system comprising:

• a hydraulic actuator including a first chamber and a second chamber;
• a first control valve fluidly connected to the first chamber via a first counter-balance valve;
• and
• a second control valve fluidly connected to the second chamber via a second counter-balance valve;
• wherein the first chamber of the hydraulic actuator is adapted to support a net load when vibration control is active;
• and
• wherein the second chamber of the hydraulic actuator is adapted to produce a vibratory response when the vibration control is active.