Discrete time control apparatus
AssigneeOmron Tateisi Electronics Co.
InventorsNorio Yoshikawa, Tadaaki Hotta
Life of this patent
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Abstract
Under a transient condition, a control variable is detected at each sampling interval, and operation on a controlled system is effected in a binary switching mode at each sampling interval. Parameters of a model for the controlled system are estimated on the basis of past controlled and manipulated variables, and a controlled variable sequence that can be predicted in response to application of a controlled variable over several future steps to the model is estimated, so that the system is controlled in order to render the controlled variable optimum. Under a normal operating condition, parameters are computed from the model for the control system that is obtained upon control under the transient condition, and the system is controlled by continuous manipulated-variable sampling control.
Claims8
A discrete time control apparatus for controlling a system in continuous time, comprising:
- sampling/detecting means for detecting a controlled system variable at each sampling interval;
- control means for selectively switching operation on the system at each sampling interval between a binary mode and a continuous mode, the control means being responsive to an external input;
- discrete-time adaptive switching control means for (i) estimating and updating model parameters at said each sampling interval based on a manipulated variable to be applied to an actuator effecting the binary mode wherein the controlled variable is detected by said sampling/detecting means in order to adapt a discrete-time model to said system, and for (ii) selecting a sequence of predicted controlled variables over predictable sampling intervals in response to application of a possible controlled-variable sequence over certain sampling intervals to said discrete-time model, thereby determining a controlled variable for said actuator;
- continuous manipulated-variable sampling control means for computing parameters based on the discrete-time model estimated by said discrete-time adaptive switching control means for effecting continuous control on said system;
- and
- switching means for selecting, one at a time, said discrete-time adaptive switching control means and said continuous manipulated-variable sampling control means based on a target preset value and the present controlled variable.
Dependencies are inferred from the claim text.