Flexible process controller

• US 5,651,264 A
• Filed: 10/13/1995
• Issued: 07/29/1997
• Est. Priority Date: 06/29/1993
• Status: Expired due to Fees

• Current Assignee: Siemens Electric Limited
• Original Assignee: Siemens Electric Limited
• Inventors: Grudzinski, Piotr, Leung, Dominic, Lo, Lai
• Primary Examiner(s): Wayner, William E.
• Application Number:
  US08/542,567
• Time in Patent Office: 655 Days
• Field of Search: 62/230, 62/181, 62/203, 165/218, 236/78 D
• US Class Current: 62/230
• 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 11/54 using one central controller connected to several sub-controllers
• CPC Class Codes: F24F 11/63 Electronic processing
• CPC Class Codes: F24F 3/065 with a plurality of evaporators or condensers
• CPC Class Codes: G05B 15/02 electric
• CPC Class Codes: G05D 23/1917 using digital means

Abstract

A flexible process controller for coordinating the operations of various equipment is disclosed. Briefly stated, in the preferred embodiment of the present invention, various parameters of the sub-systems in a HVAC system are monitored and made alterable or changeable. These parameters are transmitted to and controlled by a flexible process controller which thereafter cooperates with a motor drive controller. Logic incident to and resident in the flexible process controller consider the various parameters monitored and allow the user or the system to minimize power consumption amongst one or more of the sub-systems while maximizing efficiency and operability.

Claims

1. A method for actively coordinating the operation of a process system having at least first and second process equipment components, each of the at least first and second process equipment components operating in response to a plurality of predetermined control parameters, said method comprising the steps of:

monitoring a plurality of predetermined sensor parameters corresponding to a process environment of the process system and producing environmental data values representative thereof;

controlling the first process equipment component by adjusting selected ones of the plurality of control parameters in response to the environmental data values and to a plurality of predetermined set-point parameters which relate to respective predetermined desired output values of the process system; and

controlling the second process equipment component by adjusting selected ones of the plurality of control parameters in response to the environmental data values and to the plurality of set-point parameters;

wherein the controlling of the second process equipment component is concurrent with the controlling of the first process equipment component and the controlling of the first and second process equipment components adjust the plurality of control parameters to optimize at least one parameter of the plurality of sensor parameters which one parameter is affected by each of the first and second process equipment components.

2. A method according to claim 1 wherein each of the plurality of control parameters has predetermined minimum and maximum values and the steps of controlling the first and second process equipment components adjust the selected ones of the control parameters by interpolating between the respective minimum and maximum values of each of the selected parameters.

3. A method according to claim 2 wherein the at least one parameter of the plurality of sensor parameters includes a measure of operational power consumed by the process system.

4. A method according to claim 2 wherein:

the plurality of sensor parameters define an instantaneous state of the process system;

the plurality of set-point parameters define a desired state of the process system; and

the controlling of the first and second process equipment components adjusts the plurality of control parameters to minimize differences between selective ones of the plurality of sensor parameters and corresponding ones of the plurality of set-point parameters.

5. A method according to claim 4 wherein one of the plurality of sensor parameters is a measure of operational power consumed by the process system and the controlling of the first and second process equipment components adjusts the plurality of control parameters to minimize differences between the selected ones of the plurality of sensor parameters and the corresponding ones of the plurality of set-point parameters and to minimize the operational power consumed by the process system.

6. A device for actively coordinating the operation of a process system having at least first and second process equipment components, each of the at least first and second process equipment components operating in response to a plurality of predetermined control parameters said device comprising:

instrumentation means for monitoring a plurality of sensor parameters corresponding to a process environment of the process system and for producing environmental data values representative thereof;

flexible process control means for controlling the at least first and second process equipment components, said flexible process control means including;

first control means, for controlling the first process equipment component by adjusting selected ones of the plurality of control parameters, said first control means being responsive to the environmental data values and to a plurality of predetermined set-point parameters which relate to respective predetermined desired output values of the process system; and

second control means for controlling the second process equipment component by adjusting selected ones of the plurality of control parameters, said second control means being responsive to the environmental data values and to the plurality of set-point parameters;

wherein the first control means operates concurrently with the second control means and the flexible process control means adjusts the plurality of control parameters to optimize at least one parameter of the plurality of sensor parameter values which one parameter is affected by each of the first and second process equipment components.

7. A device according to claim 6 wherein each of the plurality of control parameters has predetermined minimum and maximum values and the flexible process control means adjusts the selected ones of the control parameters by interpolating between the respective minimum and maximum values of each of the selected parameters.

8. A device according to claim 7 wherein the at least one parameter of the plurality of sensor parameters is a measure of operational power consumed by the process system.

9. A method according to claim 7 wherein:

the plurality of sensor parameters define an instantaneous state of the process system;

the plurality of set-point parameters define a desired state of the process system; and

the flexible process control means adjusts the plurality of control parameters to minimize differences between selected ones of the plurality of sensor parameters and corresponding ones of the plurality of set-point parameters.

10. A method according to claim 9 wherein one of the plurality of sensor parameters is a measure of operational power consumed by the process system and the flexible process control means includes means for adjusting the plurality of control parameters to minimize the differences between the selected ones of the plurality of sensor parameters and the corresponding ones of the plurality of set-point parameters and to minimize the operational power consumed by the process system.