Extremum seeking control with actuator saturation control
First Claim
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1. A method for optimizing a control process for an actuator, the method comprising:
- operating the control process using an extremum seeking control strategy; and
using an electronics circuit to compensate for an actuator saturation condition of the extremum seeking control strategy, wherein the step of compensating for actuator saturation control comprises;
receiving a feedback signal representative of the actuator'"'"'s accuracy relative to a control signal for the actuator;
obtaining a difference signal between the control signal and the feedback signal;
providing the difference signal to an input of the extremum seeking control strategy to override a previously determined control parameter of the extremum seeking control strategy.
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Abstract
An extremum seeking control method optimizes a control process for a plant such as an air handling unit. The method improves the performance of an extremum seeking control strategy by limiting, removing or preventing the effects of an actuator saturation condition, particularly as the extremum seeking control strategy relates to HVAC applications.
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Citations
15 Claims
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1. A method for optimizing a control process for an actuator, the method comprising:
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operating the control process using an extremum seeking control strategy; and using an electronics circuit to compensate for an actuator saturation condition of the extremum seeking control strategy, wherein the step of compensating for actuator saturation control comprises; receiving a feedback signal representative of the actuator'"'"'s accuracy relative to a control signal for the actuator; obtaining a difference signal between the control signal and the feedback signal; providing the difference signal to an input of the extremum seeking control strategy to override a previously determined control parameter of the extremum seeking control strategy. - View Dependent Claims (2)
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3. A controller for controlling an actuator, the controller comprising:
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a processing circuit configured to operate the plant using an extremum seeking control strategy and to compensate for an actuator saturation condition of the extremum seeking control strategy; an input configured to receive a feedback signal from the actuator; and an output configured to send a control signal to the actuator; wherein the processing circuit is further configured to obtain a difference signal describing the difference between the feedback signal and the control signal and wherein the processing circuit is further configured to provide the difference signal to a portion of the processing circuit configured to provide the extremum seeking control strategy, the difference signal to override a previously determined of the extremum seeking control strategy. - View Dependent Claims (4, 5, 6, 7, 8, 9)
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10. A controller for an air handling unit having an actuator that opens and closes a damper to control the amount of outdoor air used for cooling the air provided to a building space by the air handling unit, comprising:
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an input interface configured to receive a temperature sensor input; a temperature regulator control module configured to provide a command to a temperature regulator system configured to chill air provided by the air handling unit, wherein the temperature regulator control module determines the command based on the temperature sensor input received at the input interface; an extremum seeking control module configured to receive the command from the temperature regulator control module and comprising an integrator and a performance gradient probe, the performance gradient probe configured to use the received command to detect a difference between an estimated optimal position for the actuator and a current actuator position and to provide the detected difference to the integrator, wherein the integrator is configured to calculate an actuator command signal configured to reduce the detected difference; an output interface configured to provide the actuator command signal to the actuator; and a feedback interface configured to receive a feedback signal from the actuator representative of the actual position of the actuator after the actuator is adjusted in response to the actuator command signal; wherein the extremum seeking control module is further configured to determine an error between the actuator command signal and the feedback signal; wherein the extremum seeking control module is further configured to add the error to the detected difference provided to the integrator of the extremum seeking control module. - View Dependent Claims (11, 12, 13, 14, 15)
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Specification