Adaptive real-time optimization control

• US 8,495,888 B2
• Filed: 12/14/2011
• Issued: 07/30/2013
• Est. Priority Date: 01/30/2007
• Status: Active Grant

• Current Assignee: Tyco Fire & Security GmbH (Johnson Controls International plc)
• Original Assignee: Johnson Controls Technology Company (Johnson Controls International plc)
• Inventors: Seem, John E.
• Primary Examiner(s): Ciric, Ljiljana
• Assistant Examiner(s): COX, ALEXIS K
• Application Number:
  US13/325,971
• Publication Number:
  US 20120083926A1
• Time in Patent Office: 594 Days
• Field of Search: 621/86
• US Class Current: 62/186
• CPC Class Codes: F24F 11/0001 for ventilation F24F11/30 takes precedence
• CPC Class Codes: F24F 11/30 for purposes related to the operation of the system, e.g. for safety or monitoring
• CPC Class Codes: F24F 11/46 Improving electric energy efficiency or saving
• CPC Class Codes: F24F 11/62 characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
• CPC Class Codes: F24F 11/63 Electronic processing
• CPC Class Codes: F24F 2011/0002 for admittance of outside air
• CPC Class Codes: F24F 2011/0006 using low temperature external supply air to assist cooling
• CPC Class Codes: G05B 13/042 in which a parameter or coefficient is automatically adjusted to optimise the performance
• CPC Class Codes: G05D 23/1917 using digital means
• CPC Class Codes: G05D 23/1931 to control the temperature of one space
• CPC Class Codes: Y02B 30/54 Free-cooling systems

Abstract

A computerized method for operating a process includes using at least one sensor to determine when to transition a state machine between a first operating state wherein the process is operated using extremum seeking control and a second operating state wherein the process is operated without extremum seeking control. The method further includes, in response to the determination, automatically transitioning from the first operating state to the second operating state.

Claims

1. A controller for a process, comprising:

a processing circuit configured as state machine to transition the controller and the process from a first operating state to a second operating state;

an output coupled to the processing circuit, wherein the processing circuit uses the output to provide control signals to a ventilation affecting device;

wherein in the first operating state the processing circuit operates the process using extremum seeking control; and

wherein in the second operating state the processing circuit operates the process without using extremum seeking control;

wherein the transition boundary between the first operating state and the second operating state is automatically adjusted by recalculating a specific volume of outdoor air threshold.

2. The controller of Claim 1, wherein the ventilation affecting device affects a fraction of outdoor air used for cooling.

3. The controller of claim 2, wherein the extremum seeking control of the first operating state is configured to seek the fraction of outdoor air used for cooling that minimizes power consumption of a mechanical cooling device.

4. The controller of claim 3, wherein the second operating state is a state in which the fraction of outdoor air is held in a maximum level while the mechanical cooling device is varied to meet cooling demands.

5. The controller of claim 3, wherein the second operating state is a state in which the fraction of outdoor air used for cooling is held at a minimum level while the mechanical cooling device is controlled to meet cooling demands.

6. The controller of claim 5, wherein the processing circuit is further configured to transition the controller and the process from the first operating state to a third operating state.

7. The controller of claim 6, wherein the third operating state is a state in which the fraction of outdoor air used for cooling is held at a maximum level while the mechanical cooling device is varied to meet cooling demands.

8. The controller of claim 7, wherein the processing circuit is configured to transition between the first operating state, wherein the processing circuit operates the process using extremum seeking control, and the third operating state by evaluating humidity and temperature of the outdoor air.

9. The controller of claim 8, wherein the processing circuit is configured to transition between the first operating state wherein the processing circuit operates the process using extremum seeking control and the second operating state by evaluating humidity and specific volume of the outdoor air.

10. A computerized method for operating a process, comprising:

using at least one sensor input to determine when to transition a state machine between a first operating state wherein the process is operated using extremum seeking control and a second operating state wherein the process is operated without extremum seeking control; and

in response to the determination, automatically transitioning from the first operating state to the second operating state;

wherein the computerized method is conducted by a controller for providing control signals to a ventilation affecting device, wherein a transition boundary between the first operating state and the second operating state is automatically adjusted by recalculating a specific volume of outdoor air threshold.

11. The computerized method of claim 10, wherein the process comprises cooling a building space by controllably varying an amount of outdoor air introduced into the building space.

12. The computerized method of Claim 10, wherein the ventilation affecting device is a damper having an actuator that receives a control signal from the controller.

13. A computerized method for operating a process, comprising:

using at least one sensor input to determine when to transition a state machine between a first operating state wherein the process is operated using extremum seeking control and a second operating state wherein the process is operated without extremum seeking control; and

in response to the determination, automatically transitioning from the first operating state to the second operating state;

wherein the computerized method is conducted by a controller for providing control signals to a ventilation affecting device, wherein a transition boundary between the first operating state and the second operating state is automatically adjusted by recalculating an enthalpy of outdoor air threshold.

14. The computerized method of claim 13, wherein the process comprises cooling a building space by controllably varying an amount of outdoor air introduced into the building space.

15. The computerized method of claim 13, wherein the ventilation affecting device is a damper having an actuator that receives a control signal from the controller.

16. A controller for a process, comprising:

a processing circuit configured as state machine to transition the controller and the process from a first operating state to a second operating state;

an output coupled to the processing circuit, wherein the processing circuit uses the output to provide control signals to a ventilation affecting device;

wherein in the first operating state the processing circuit operates the process using extremum seeking control; and

wherein in the second operating state the processing circuit operates the process without using extremum seeking control;

wherein a transition boundary between the first operating state and the second operating state is automatically adjusted by recalculating an enthalpy of outdoor air threshold.

17. The controller of claim 16, wherein the ventilation affecting device affects a fraction of outdoor air used for cooling.

18. The controller of claim 17, wherein the extremum seeking control of the first operating state is configured to seek the fraction of outdoor air used for cooling that minimizes power consumption of a mechanical cooling device.

19. The controller of claim 18, wherein the second operating state is a state in which the fraction of outdoor air used for cooling is held at a minimum level while the mechanical cooling device is controlled to meet cooling demands.

20. The controller of claim 19, wherein the processing circuit is further configured to transition the controller and the process from the first operating state to a third operating state.

21. The controller of claim 20, wherein the third operating state is a state in which the fraction of outdoor air used for cooling is held at a maximum level while the mechanical cooling device is varied to meet cooling demands.

22. The controller of claim 21, wherein the processing circuit is configured to transition between the first operating state, wherein the processing circuit operates the process using extremum seeking control, and the third operating state by evaluating humidity and temperature of the outdoor air.