Self learning control system and method for optimizing a consumable input variable

• US 9,823,627 B2
• Filed: 11/13/2013
• Issued: 11/21/2017
• Est. Priority Date: 12/12/2012
• Status: Active Grant

• Current Assignee: S.A. Armstrong Limited
• Original Assignee: S.A. Armstrong Limited
• Inventors: Acosta Gonzalez, Marcelo Javier
• Primary Examiner(s): Bahta, Kidest
• Application Number:
  US14/443,207
• Publication Number:
  US 20150293505A1
• Time in Patent Office: 1,469 Days
• CPC Class Codes: F04D 15/0209 responsive to a condition of the working fluid F04D15/029 takes precedence
• CPC Class Codes: F04D 15/029 for pumps operating in parallel
• CPC Class Codes: F04D 27/00 Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
• CPC Class Codes: G05B 13/04 involving the use of models or simulators
• CPC Class Codes: G05B 13/041 in which a variable is automatically adjusted to optimise the performance
• CPC Class Codes: G05B 15/02 electric
• CPC Class Codes: G05B 19/042 using digital processors G05B19/05 takes precedence
• CPC Class Codes: G05D 7/0617 specially adapted for fluid materials
• CPC Class Codes: G05D 7/0682 using a plurality of flow sources
• CPC Class Codes: Y02B 30/70 Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

A control system for an operable system such as a flow control system or temperature control system. The system operates in a control loop to regularly update a model with respect at least one optimizable input variable based on the detected variables. The model provides prediction of use of the input variables in all possible operation points or paths of the system variables which achieve an output setpoint. In some example embodiments, the control loop is performed during initial setup and subsequent operation of the one or more operable elements in the operable system. The control system is self-learning in that at least some of the initial and subsequent parameters of the system are determined automatically during runtime.

Claims

1. A control system for controlling an operable flow system, comprising:

one or more operable elements resulting in output variables, at least one of the operable elements including a respective variably controllable motor, wherein there is more than one operation point or path of system variables of the operable flow system that can provide a given output setpoint of a circulating medium, wherein at least one system variable at an operation point or path restricts operation of another system variable at the operation point or path; and

one or more controllers configured to operate in a control loop to;

detect input variables, the input variables including non-controllable variables and system controllable variables, the non-controllable variables including output demand, the system controllable variables include a speed of at least one of the variably controllable motors and at least one optimizable input variable, the at least one optimizable input variable including power consumed,

detect the system variables including pressure and flow of the circulating medium for the operable flow system,

update a model with respect to the at least one optimizable input variable, comprising calculating the updated model using established relationships between variables, the detected input variables and the detected system variables, the updated model providing, based on established relationships between variables, prediction of use of the input variables in all possible operation points or paths of the system variables, including the pressure and the flow, which achieve an output setpoint of the circulating medium, and

operate, based on one or more of the detected input variables and the detected system variables, the one or more operable elements in accordance with the updated model to provide an optimal operation point or path of the system variables which achieves the output setpoint and which optimizes consumption of the at least one optimizable input variable;

wherein for iterations of the control loop said updating of the model is based on said operating of the one or more operable elements during the control loop;

wherein the one or more controllers are configured to, during initial setup of the one or more operable elements in the operable flow system, without prior knowledge of the system variables, perform the control loop to determine the system variables for initially calculating the model.

2. The control system as claimed in claim 1, wherein the control loop is performed during initial setup and subsequent operation of the one or more operable elements in the operable flow system.

3. The control system as claimed in claim 1, wherein a non controllable input variable includes a variable system hydraulic resistance of the operable flow system.

4. The control system as claimed in claim 1, wherein the one or more controllers are further configured to perform a system review through specified operation of the output variables to calibrate at least one optimizable input variable.

5. The control system as claimed in claim 1, wherein said updating includes updating the model for subsequent iterations of the control loop.

6. The control system as claimed in claim 1, wherein the optimizable input variable comprises a power efficiency variable of the one or more operable elements.

7. The control system as claimed in claim 1, wherein said detecting of the output variables comprises self-detecting device properties of the operable element and correlating to the output variables.

8. The control system as claimed in claim 1, wherein said optimizing includes maintaining a specified average value of the at least one optimizable input variable.

9. The control system as claimed in claim 1, wherein said optimizing includes maintaining a specified operation range of the at least one optimizable input variable.

10. The control system as claimed in claim 1, wherein said optimizing includes maintaining a specified distribution, detected over a specified operation time, of the at least one optimizable input variable.

11. The control system as claimed in claim 1, wherein at least one optimizable input variable is a consumable input variable.

12. The control system as claimed in claim 1, wherein detecting of the system variables further includes correlating at least one of the system variables from at least one self-detected device property of the one or more operable elements.

31. The control system as claimed in claim 1:

wherein the operable flow system further comprises a chilled circulating system including;

a refrigerant, and

wherein the one or more operable elements includes a compressor having the respective variably controllable motor for controlling circulation of the refrigerant, resulting in the output variables including lift and flow for the refrigerant.

32. The control system as claimed in claim 1, wherein the output variables include a temperature variable to achieve the output setpoint.

33. The control system as claimed in claim 1, wherein the non-controllable variables include outdoor temperature.

13. A flow control system for controlling a flow system, comprising:

one or more circulating pumps each having a respective variably controllable motor resulting in output variables including pressure and flow of a circulating medium for the flow system; and

one or more controllers configured to operate in a control loop to;

detect input variables, the input variables including non-controllable variables and system controllable variables, the non-controllable variables including output demand, the system controllable variables include a speed of at least one of the variably controllable motors and at least one optimizable input variable, the at least one optimizable input variable including power consumed,

detect the output variables including pressure and flow of the circulating medium for the flow system,

update a model with respect to the at least one optimizable input variable, comprising calculating the updated model using established relationships between variables, at least one of the detected input variables and the detected output variables, the updated model providing, based on established relationships between variables, prediction of use of the input variables in all possible operation points or paths of the output variables which achieve an output setpoint of the circulating medium,

optimize a control curve in accordance with the updated model with respect to the at least one optimizable input variable based on the detected input variables and the detected output variables, the control curve providing co-ordination of the operation point or path of the pressure and flow in order to achieve the output setpoint of the circulating medium, and

operate, based on one or more of the detected variables, at least one of the variably controllable motors of the one or more circulating pumps in accordance with the optimized control curve to provide the operation point or path of the pressure and flow to achieve the output setpoint and which optimizes consumption of the at least one optimizable input variable;

wherein for iterations of the control loop said updating of the model is based on said operating of said at least one of the variably controllable motors during the control loop;

wherein the one or more controllers are configured to, during initial setup of the circulating pumps in the flow system, without prior knowledge of the system variables, perform the control loop to determine the system variables for initially calculating the model.

14. The flow control system as claimed in claim 13, wherein the control loop is performed during initial setup and subsequent operation of the at least one of the variably controllable motors.

15. The flow control system as claimed in claim 13, wherein the one or more controllers are further configured to perform a system review through specified operation of the output variables to calibrate the at least one optimizable input variable.

16. The flow control system as claimed in claim 13, wherein said optimizing includes updating parameters of the control curve for subsequent iterations of the control loop.

17. The flow control system as claimed in claim 13, wherein the optimizable input variable comprises a power efficiency variable of the at least one of the variably controllable motors.

18. The flow control system as claimed in claim 17, wherein the power efficiency variable is an efficiency curve of the at least one of the variably controllable motors.

19. The flow control system as claimed in claim 13, wherein said detecting of the output variables comprises correlating self-detected device properties of the at least one of the variably controllable motors to the output variables.

20. The flow control system as claimed in claim 13, wherein a non-controllable input variable includes a hydraulic resistance variable of the flow system.

21. The flow control system as claimed in claim 20, wherein said optimizing includes maintaining a specified average value of the system hydraulic resistance variable.

22. The flow control system as claimed in claim 20, wherein said optimizing includes maintaining a specified operation range of the system hydraulic resistance variable.

23. The flow control system as claimed in claim 20, wherein said optimizing includes maintaining a specified distribution, detected over a specified operation time, of the system hydraulic resistance variable.

24. The flow control system as claimed in claim 13, wherein at least one optimizable input variable is a consumable input variable.

34. The flow control system as claimed in claim 13, wherein the output variables include a temperature variable to achieve the output setpoint.

35. The flow control system as claimed in claim 13, wherein the non-controllable variables include outdoor temperature.

25. A method for controlling an operable flow system, the operable flow system including one or more operable elements resulting in output variables, at least one of the operable elements including a respective variably controllable motor, wherein there is more than one operation point or path of system variables of the operable flow system that can provide a given output setpoint of a circulating medium, wherein at least one system variable at an operation point or path restricts operation of another system variable at the operation point or path, the method being performed as a control loop and comprising:

detecting input variables, the input variables including non-controllable variables and system controllable variables, the non-controllable variables including output demand, the system controllable variables include a speed of at least one of the variably controllable motors and at least one optimizable input variable, the at least one optimizable input variable including power consumed;

detecting the system variables including pressure and flow of the circulating medium for the operable flow system;

updating a model with respect to the at least one optimizable input variable, comprising calculating the updated model using established relationships between variables, the detected input variables and the detected system variables, the updated model providing, based on established relationships between variables, prediction of use of the input variables in all possible operation points or paths of the system variables which achieve an output setpoint; and

operating, based on one or more of the detected input variables and the detected system variables, the one or more operable elements in accordance with the updated model to provide an optimal operation point or path of the system variables which achieves the output setpoint and which optimizes consumption of the at least optimizable one input variable;

wherein for iterations of the control loop said updating of the model is based on said operating of the one or more operable elements during the control loop;

wherein the one or more controllers are configured to, during initial setup of the one or more operable elements in the operable flow system, without prior knowledge of the system variables, perform the control loop to determine the system variables for initially calculating the model.

26. A non-transitory computer readable medium comprising instructions which, when executed by one or more controllers, cause the controllers to control an operable flow system in a control loop, the operable system including one or more operable elements resulting in output variables, at least one of the operable elements including a respective variably controllable motor, wherein there is more than one operation point or path of system variables of the operable flow system that can provide a given output setpoint of a circulating medium, wherein at least one system variable at an operation point or path restricts operation of another system variable at the operation point or path, the instructions comprising:

instructions for detecting input variables, the input variables including non-controllable variables and system controllable variables, the non-controllable variables including output demand, the system controllable variables include a speed of at least one of the variably controllable motors and at least one optimizable input variable, the at least one optimizable input variable including power consumed;

instructions for detecting the system variables including pressure and flow of the circulating medium for the operable flow system;

instructions for updating a model with respect to the at least one optimizable input variable, comprising calculating the updated model using established relationships between variables, the detected input variables and the detected system variables, the updated model providing, based on established relationships between variables, prediction of use of the input variables in all possible operation points or paths of the system variables which achieve an output setpoint of the circulating medium; and

instructions for operating, based on one or more of the detected input variables and the detected system variables, the one or more operable elements in accordance with the updated model to provide an optimal operation point or path of the system variables which achieves the output setpoint and which optimizes consumption of the at least one optimizable input variable;

wherein for iterations of the control loop said updating of the model is based on said operating of the one or more operable elements during the control loop;

wherein the one or more controllers are configured to, during initial setup of the one or more operable elements in the operable flow system, without prior knowledge of the system variables, perform the control loop to determine the system variables for initially calculating the model.

27. A flow control system for controlling a chilled circulating system having a refrigerant, comprising:

one or more compressors each having a respective variably controllable one or more operable elements, including a respective motor, resulting in output variables including lift and flow for the refrigerant of the chilled circulating system; and

one or more controllers configured to operate in a control loop to;

detect input variables, the input variables including non-controllable variables and system controllable variables, the non-controllable variables including output demand, the system controllable variables including a speed of at least one of the motors and at least one optimizable input variable, the at least one optimizable input variable including power consumed,

detect the output variables including the lift and the flow of the refrigerant,

update a model with respect to the at least one optimizable input variable, comprising calculating the updated model using established relationships between variables, at least one of the detected input variables and the detected output variables, the updated model providing, based on established relationships between variables, prediction of use of the input variables in all possible operation points or paths of the output variables which achieve an output setpoint,

optimize a control curve in accordance with the updated model with respect to the at least one optimizable input variable based on the detected input variables and the detected output variables, the updated model providing co-ordination of the operation point or path of the outputs in order to achieve the output setpoint, and

operate, based on one or more of the detected variables, the variably controllable one or more operable elements in accordance with the optimized control curve to provide the operation point or path of the outputs to achieve the output setpoint and with optimizes consumption of the at least one optimizable input variable including power consumed;

wherein for iterations of the control loop said updating of the model is based on said operating of the one or more operable elements during the control loop;

wherein the one or more controllers are configured to, during initial setup of the one or more operable elements in the chilled circulating system, without prior knowledge of the system variables, perform the control loop to determine the system variables for initially calculating the model.

28. The flow control system as claimed in claim 27, wherein the chilled circulating system includes an interface in thermal communication with a secondary circulating system.

29. The flow control system as claimed in claim 27, wherein the non-controllable variables includes outdoor temperature.

30. The flow control system as claimed in claim 27, wherein the output variables include a temperature variable to achieve the output setpoint.

36. A temperature control system for controlling a circulating system, the circulating system having a circulating medium and an interface in thermal communication with a secondary circulating system, comprising:

one or more operable elements resulting in output variables, at least one of the operable elements including a respective variably controllable motor, wherein there is more than one operation point or path of system variables of the circulating system that can provide a given output setpoint, wherein at least one system variable at an operation point or path restricts operation of another system variable at the operation point or path; and

one or more controllers configured to operate in a control loop to;

detect input variables, the input variables including non-controllable variables and system controllable variables, the non-controllable variables including output demand, the system controllable variables include a speed of at least one of the variably controllable motors and at least one optimizable input variable, the at least one optimizable input variable including power consumed,

detect the system variables including temperature for the circulating system,

update a model with respect to the at least one optimizable input variable, comprising calculating the updated model using established relationships between variables, the detected input variables and the detected system variables, the updated model providing, based on established relationships between variables, prediction of use of the input variables in all possible operation points or paths of the system variables which achieve an output setpoint, and

operate, based on one or more of the detected input variables and the detected system variables, the one or more operable elements in accordance with the updated model to provide an optimal operation point or path of the system variables which achieves the output setpoint and which optimizes consumption of the at least one optimizable input variable;

wherein for iterations of the control loop said updating of the model is based on said operating of the one or more operable elements during the control loop;

wherein the one or more controllers are configured to, during initial setup of the one or more operable elements in the circulating system, without prior knowledge of the system variables, perform the control loop to determine the system variables for initially calculating the model.

37. The temperature control system as claimed in claim 36, wherein the circulating system further comprises a chilled circulating system having one or more cooling coils at the interface, wherein the one or more operable elements includes a variable compressor, and wherein the output demand includes demand defined by the cooling coils, and wherein the circulating medium includes a refrigerant.

38. The temperature control system as claimed in claim 36, wherein the circulating system further comprises a heating circulating system having one or more heating elements at the interface, wherein the one or more operable elements includes a variable pump, and wherein the output demand includes demand defined by the heating elements.

39. The temperature control system as claimed in claim 36, wherein the output variables include a temperature variable to achieve the output setpoint.

40. The temperature control system as claimed in claim 36, wherein the non-controllable variables include outdoor temperature.