Method and apparatus for internal model control using a state variable feedback signal
First Claim
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1. An apparatus for controlling a process comprising:
- means for providing at least one control signal in response to at least one setpoint reference signal, said providing means including at least one integration function;
means for modeling a process to be controlled, and for outputting a predicted process output signal in response to said at least one control signal; and
means for producing an error signal between a process output signal and said predicted process output signal, said error signal being a first input to said providing means to modify at least one setpoint reference signal, and said error signal being a second input to said providing means to modify an output of said integration function.
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Abstract
The present invention relates generally to the control of processes which include relatively long time delays, yet which are susceptible to transient external disturbances, such as high-speed sheetmaking processes. Exemplary embodiments include a control system architecture that combines internal model-based control with state feedback in a manner which provides robust control, yet provides rapid rejection of external transient disturbances even in processes including relatively long time delays.
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9 Claims
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1. An apparatus for controlling a process comprising:
- means for providing at least one control signal in response to at least one setpoint reference signal, said providing means including at least one integration function;
means for modeling a process to be controlled, and for outputting a predicted process output signal in response to said at least one control signal; and means for producing an error signal between a process output signal and said predicted process output signal, said error signal being a first input to said providing means to modify at least one setpoint reference signal, and said error signal being a second input to said providing means to modify an output of said integration function. - View Dependent Claims (2, 3, 4)
- means for providing at least one control signal in response to at least one setpoint reference signal, said providing means including at least one integration function;
- 5. The apparatus according to claim 5, wherein said predicted state vector is of an at least second order system.
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7. An apparatus for controlling a process having an order greater than one comprising:
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means for providing at least one control signal in response to at least one setpoint reference signal, said providing means including at least one integration function; means for modeling a process to be controlled, and for outputting a predicted process output signal in response to said at least one control signal; and
means for producing an error signal between a process output signal and said predicted process output signal, said error signal being a state feedback vector of said process.
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8. A method for controlling a process, comprising the steps of:
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receiving at least one setpoint reference signal; modeling a process to be controlled; producing a predicted process output signal in response to said at least one setpoint signal; producing both a control signal based on a time integral of said predicted process output signal and a control signal not based on a time integral of said predicted process output signal; and controlling said process using both said control signal based on a time integral of said predicted process output signal and said control signal not based on a time integral of said predicted process output signal.
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9. A method for controlling a process having an order greater than one, comprising the steps of:
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receiving at least one setpoint reference signal; modeling a process to be controlled; producing a predicted process output signal in response to said at least one setpoint signal; producing an error signal between a process output signal and said predicted process output signal, said error signal being a state feedback vector of said process.
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Specification