Motor vehicles – Bodies – Movable cab or operator's station
Reexamination Certificate
2005-05-03
2005-05-03
Dickson, Paul N. (Department: 3616)
Motor vehicles
Bodies
Movable cab or operator's station
C248S550000
Reexamination Certificate
active
06886650
ABSTRACT:
A suspension system supports a seat with respect to a base mounted on a frame of a vehicle. The system includes a hydraulic actuator coupled between the seat and the base. A single accelerometer is attached to the base and generates a base acceleration signal in response to motion of the base. A control unit actively controls the hydraulic actuator as a function of the base acceleration signal. The control unit generates a base velocity signal by integrating the base acceleration signal, generates a seat position signal representing a position of the seat relative to the base, generates a seat position error signal representing a difference between a desired position and the seat position signal, and generates a command signal as a function of the velocity signal and of the position error signal. The control unit controls the actuator by applying the command signal thereto.
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