Eaton Intelligent Power Limited

Eaton Corporation

Danfoss Power Solutions Ii Technology A/s

Meng (Rachel) Wang

Michael Berne Rannow

Damrongrit Piyabongkarn

Aaron Hertzel Jagoda

Vishal Vijay Mahulkar

Chad Anthony Larish

Per William Danzl

A hydraulic system () and method for reducing boom dynamics of a boom (), while providing counter-balance valve protection, includes a hydraulic actuator (), first and second counter-balance valves (), first and second control valves (), and first and second blocking valves (). A net load () is supported by a first chamber () of the hydraulic actuator, and a second chamber () of the hydraulic actuator may receive fluctuating hydraulic fluid flow from the second control valve to produce a vibratory response () that counters environmental vibrations () on the boom. The first blocking valve prevents the fluctuating hydraulic fluid flow from opening the first counter-balance valve. The first blocking valve may drain leakage from the first counter-balance valve.

Pilot control mechanism for boom bounce reduction

A hydraulic system () and method for reducing boom dynamics of a boom (), while providing counter-balance valve protection, includes a hydraulic cylinder (), first and second counter-balance valves (), first and second control valves (), and a selection valve set (). The selection valve set is adapted to self-configure to a first configuration and to a second configuration when a net load () is supported by a first chamber () and a second chamber () of the hydraulic cylinder, respectively. When the selection valve set is enabled in the first and second configurations, the second and first control valve may fluctuate hydraulic fluid flow to the second and first chamber, respectively, to produce a vibratory response () that counters environmental vibrations () of the boom. When the selection valve set is not enabled, the first and second counter-balance valves are adapted to provide the hydraulic cylinder with conventional counter-balance valve protection.

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

A hydraulic system () and method for reducing boom dynamics of a boom (), while providing counter-balance valve protection, includes a hydraulic cylinder (), first and second counter-balance valves (), first and second control valves (), and first and second blocking valves (). A net load () is supported by a first chamber () of the hydraulic cylinder, and a second chamber () of the hydraulic cylinder may receive fluctuating hydraulic fluid flow from the second control valve to produce a vibratory response () that counters environmental vibrations () on the boom. The method may include measuring first pressure ripples at the second chamber and reducing a magnitude of second pressure ripples at the first chamber. The pressure ripples may be transformed into a flow command by multiplying the pressure ripples by a gain and/or phase shifting. The gain and/or the phase shifting may be adjusted by feedback. The feedback may include the second pressure ripples at the load holding chamber, a position of the hydraulic actuator, and/or an operator input. A reference signal may be filtered with a moving average filter.

Control strategy for reducing boom oscillation

A control system for a hydraulic system including an accumulator and a hydraulic transformer coordinates flow sharing within the hydraulic system. The hydraulic transformer includes first and second variable displacement pump/motor units mounted on a rotatable shaft. The rotatable shaft has an end adapted for connection to a first external load. The first variable displacement pump/motor unit includes a first side that fluidly connects to a pump and a second side that fluidly connects to a tank. The second variable displacement pump/motor unit includes a first side that fluidly connects to the accumulator and a second side that fluidly connects with the tank. A second external load may be hydraulically connected to the hydraulic system. Energy may be transferred to/from the pump, the accumulator, the first external load, and/or the second external load, as directed by the control system.

Growing community of inventors

Eden Prairie, MN, United States of America

Meng (Rachel) Wang