Low frequency booster for RV/shock/friction disturbance rejection
AssigneeHitachi Asia Ltd.
InventorQing Wei Jia
Life of this patent
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Abstract
A system for removing low frequency disturbance signals from a control system output. The system includes a controller, a mixer, a feedback loop, and a low pass filter. The controller generates a control signal. The mixer is connected to the controller and receives the control signal from the controller. The feedback loop connects an output of said mixer to an input of the mixer. A low pass filter in the feedback loop allows low frequency disturbance signals in the control signal output from the mixer to pass through the feedback loop and to be added to the control signal by said mixer for handling by the controller.
Claims36
A system for removing low frequency disturbance signals from a control signal for a plant, said system comprising:
- a controller that generates said control signal;
- a mixer connected to said controller to receive said control signal;
- a feedback loop that connects an output of said mixer to an input of said mixer;
- and
- a low pass filter in said feedback loop that allows said low frequency disturbance signals in said control signal output from said mixer
- to pass through said feedback loop and
- to be added to said control signal by said mixer for handling by said controller.
A method for removing low frequency disturbance signals from a control system, said method comprising:
- tapping a control signal generated by a controller;
- isolating said low frequency disturbance signals from said control signal;
- and
- adding said isolated low frequency disturbance signals to said control signal.
An apparatus for removing low frequency disturbance signals from a control signal for a plant, said apparatus comprising:
- means for generating said control signal;
- means for receiving said control signal;
- means for isolating said low frequency disturbance signals in said received control signal;
- and
- means for adding said isolated low frequency disturbance signals to said control signal.
Dependencies are inferred from the claim text.