Adaptive control system

• US 4,620,668 A
• Filed: 04/25/1985
• Issued: 11/04/1986
• Est. Priority Date: 04/25/1985
• Status: Expired due to Fees

• Current Assignee: Honeywell Incorporated (Honeywell International Inc.)
• Original Assignee: Honeywell Incorporated (Honeywell International Inc.)
• Inventors: Adams, John T.
• Primary Examiner(s): Wayner, William E.
• Application Number:
  US06/727,315
• Time in Patent Office: 558 Days
• Field of Search: 236/46 R, 165/12, 364/557, 364/505, 364/148
• US Class Current: 236/46.00R
• CPC Class Codes: G05D 23/1904 variable in time

Abstract

An adaptive control system uses a controller for controlling an air temperature treatment apparatus at a reduced energy consuming level during periods of non-occupancy of a building and for energizing the air treatment apparatus before occupancy so that a desired internal building temperature is reached by a time of occupancy. The controller includes a temperature sensor for sensing an environmental temperature within the building, a control timer responsive to the actual time-of-day for initiating the start of a pre-occupancy control cycle for the temperature treatment apparatus at a first predetermined real time, an adjustable timer for defining a second predetermined time following the first time, and logic means for incrementing or decrementing the second predetermined time by an incremental time in response to a comparison of the environmental temperature reached in the building at the end of the sum of the first and second real times with a setpoint temperature representative of the desired building temperature.

Claims

1. An adaptive control system comprising

sensing means for sensing an environmental variable to produce a first output signal representative of the variable,

a first timer means for producing a second output signal after a first predetermined period,

second timer means responsive to said second output signal and to a timing control sign for producing a control signal at the end of a time period selectable from a second predetermined time period less than said first predetermined time period,

environmental variable control means responsive to said control signal for controlling said variable, and

setpoint comparator means for comparing said first output signal with a setpoint level at the end of the sum of said first and second time periods to produce said timing control signal to select said selectable time period.

2. A control system as set forth in claim 1 wherein said first time period is twenty-two hours and said second time period is two hours.

3. A control system as set forth in claim 1 wherein said selectable time period is selectable in fifteen minute increments from said second time period.

4. A control system as set forth in claim 1 wherein said environmental variable is temperature and said control means controls the temperature.

5. A control system as set forth in claim 1 wherein said first timer means includes a fixed frequency oscillator producing clock signals and a counter for counting said clock signals to produce said second output signal.

6. A control system as set forth in claim 5 wherein said second timer means includes a second counter for counting said clock signals and presettable to an initial count to define said control time period at the end of a count by said second coutner.

10. An adaptive control system as set forth in claim 4 wherein said environmental variable is temperature and treatment apparatus affects the temperature of the air in the building.

7. An adaptive control system for controlling an environment treatment apparatus at a reduced energy consuming level during periods of non-occupancy of a building and for energizing the environment treatment apparatus before a predetermined occupancy time of the building so that the building internal environment is at a setpoint level by the time of occupancy comprising

sensing means for sensing an environmental variable within the building and for comparing said variable with a setpoint level at the time of occupancy to produce a timing control signal representative of said comparison,

a first timer means for producing a first output signal after a first predetermined real time period,

second timer means responsive to said first output signal and to said timing control signal for producing an energy control signal at the end of a control time period selectable from a second predetermined real time period less then said first predetermined real time period, the sum of said first and second predetermined time period, occuring at the start of the time of occupancy, and

connection means for applying said energy control signal to the environment treatment apparatus to energize said environmental variable at the end of said control time period prior to the occupancy of the building.

8. An adaptive control system as set for in claim 7 wherein said first real time period is twenty-two hours and said second real time period is two hours.

9. An adaptive control system as set forth in claim 8 wherein said control time period is incrementally adjustable by fifteen minute intervals.

11. A control system as set forth in claim 7 wherein said first timer means includes a fixed frequency oscillator producing clock signals, and a first counter for counting said clock signal to define said first real time period.

12. A control system as set forth in claim 11 wherein said second timer means includes a second counter for counting said clock signal and having an initial count selectable by said timing control signal to define said control time period at the end of a count by said second counter.

13. A method for controlling an environment treatment apparatus at a reduced energy consuming level during periods of non-occupancy of a building and for energizing the environment treatment apparatus before a predetermined time of occupancy of the building so that the building internal environment is at a setpoint level by the time of occupancy comprising the steps of

sensing an environmental variable within the building,

comparing said variable with a setpoint level at the time of occupancy to produce a timing control signal representative of said comparison,

utilizing the timing control signal to determine a control time period selectable from a first predetermined real time period which occurs after a second predetermined real time period which is greater than the first predetermined time period, the sum of the first and second predetermined time perods occuring at the start of the occupancy time of the building,

producing an energy control signal at the end of the control time period and

initiating operation of the treatment apparatus in response to the energy control signal.

14. A method as set forth in claim 13 wherein the second predetermined time period is twenty-two hours and the first predetermined time is tow hour period.

15. A method as set forth in claim 13 wherein the environmental variable is temperature and the treatment apparatus affects the temperature of the air in the building.