Motor vehicles – Bodies – Movable cab or operator's station
Patent
1997-11-12
2000-02-29
Culbreth, Eric
Motor vehicles
Bodies
Movable cab or operator's station
180 8912, 29619007, B62D 3308
Patent
active
060297646
ABSTRACT:
An active suspension system for a work vehicle is disclosed herein. The system includes multiple active vibration isolators mounted between the chassis and cab of the vehicle. Each isolator includes mounts attached to the cab and the chassis, and a spring and a hydraulic actuator are connected between the mounts. The actuator includes a cylinder and a piston moveable therein. The actuator moves the cab relative to the chassis when pressurized hydraulic fluid is selectively supplied and relieved to the actuator by a valve assembly responsive to a valve control signal. The isolator includes a first sensor to measure the displacement between the mounts, and a second sensor to measure movement of the cab due to disturbances in the chassis. The multiple isolators are controlled by a common control circuit which receives the sensed signals and generates the valve control signals to attenuate transmission of force between the cab and the chassis and to control the displacements. The control signals are coordinated with each other to coordinate control of the vibration isolators. The control signals can coordinate control of the displacements, or the attenuation of force, between the isolators. The pressure in air springs supporting the static weight of the cab may also be controlled in a coordinated manner.
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Active Cab Suspension; by Bjorn Lofgren; Skog Forsk, Results, No. 4, 1995.
Case Corporation
Culbreth Eric
LandOfFree
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