Semi-active ride control for a mobile machine

Details Semi-active ride control for a mobile machine Semi-active ride control for a mobile machine

2007-01-23

2007-01-23

Kershteyn, Igor (Department: 3745)

Power plants

Pressure fluid source and motor

With control means for structure storing work driving energy

C060S468000

Reexamination Certificate

active

11056684

ABSTRACT:
A system and method of achieving ride control for a work vehicle that replaces a traditional accumulator with a ride control valve, a directional control valve and a fluid pressure source. The fluid pressure source may be a variable displacement hydraulic pump. The ride control valve is set to a first relief pressure that allows fluid to flow from the head end of a hydraulic cylinder when the loading on the cylinder, i.e., the pressure in the head end is equal to or greater than the first relief pressure. A work tool of the vehicle falls from a first position to a second position when fluid flows from the head end. The ride control valve is then reset to a second relief pressure, higher than the first relief pressure and sufficient to move the work tool toward the first position. Afterwards, the directional control valve is opened long enough to allow fluid from the fluid pressure source to enter the head end and move the work tool back to approximately the first position. The ride control valve may be dynamically adjusted.

REFERENCES:
patent: 5048296 (1991-09-01), Sunamura et al.
patent: 5733095 (1998-03-01), Palmer et al.
patent: 6938413 (2005-09-01), Harnischfeger

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