Vehicle suspension control system
AssigneeDeere & Company
InventorSteven Daniel Wallestad
Life of this patent
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Abstract
A vehicle suspension system includes a fluid pump, a pair of suspension cylinders and a hydraulic control circuit for controlling pressurization of the suspension cylinders. Each suspension cylinder has a head end and a rod end. The control circuit includes a proportional rod pressure control valve with a first pilot which is exposed to a pressure which is communicated to the head end of the suspension cylinder, and a second pilot which is exposed to pressure which is communicated to the rod end of the suspension cylinder. The rod pressure control valve controls pressure in the rod end of the suspension cylinder as a function of and proportional to the pressure in the head end of the suspension cylinder. A suspension damping valve controls communication between a chamber of the cylinder and an accumulator.
Claims15
A hydraulic control circuit for a vehicle suspension system having a fluid pump and a suspension cylinder having a head chamber and a rod chamber, the control circuit comprising:
- an accumulator connected to the rod chamber;
- and
- a proportional rod pressure control valve having a first pilot which is exposed to a pressure which is communicated to the head chamber of the suspension cylinder, and a second pilot which is exposed to pressure which is communicated to the rod chamber of the suspension cylinder, the first and second pilots operating together against a spring, the rod pressure control valve controlling pressure in the accumulator and the rod chamber of the suspension cylinder as a function of and proportional to the pressure in the head chamber of the suspension cylinder.
A vehicle suspension system coupled between a frame and axle of the vehicle, comprising:
- a fluid pump;
- a suspension cylinder coupled between the frame and the axle, the cylinder having a first chamber and a second chamber;
- an accumulator connected to the second chamber;
- and
- a control circuit for controlling fluid communication between the pump and the cylinder, the control circuit comprising a proportional rod pressure control valve having a first pilot which is exposed to a pressure which is communicated to the first chamber of the suspension cylinder, and a second pilot which is exposed to pressure which is communicated to the second chamber of the suspension cylinder, the first and second pilots operating together against a spring, the rod pressure control valve controlling pressure in the accumulator and the second chamber of the suspension cylinder as a function of and proportional to the pressure in the first chamber of the suspension cylinder.
Dependencies are inferred from the claim text.