Thermostat control

• US 5,211,332 A
• Filed: 09/30/1991
• Issued: 05/18/1993
• Est. Priority Date: 09/30/1991
• Status: Expired due to Term

• 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:
  US07/769,038
• Time in Patent Office: 596 Days
• Field of Search: 236/78 D, 236/68 B, 364/557
• US Class Current: 236/78.00D
• CPC Class Codes: G05D 23/1917 using digital means

Abstract

A process of operating an electronic thermostat so that it models the effects of a mechanical thermostat anticipator.

Claims

1. A method of controlling the operation of HVAC equipment in a thermostat, the thermostat having a set point and droop and measuring a room temperature, comprising the steps of:

(a) creating Count variable having a preselected initial value;

(b) creating a first new Count variable which is equal to said Count variable plus a first difference between the setpoint and the room temperature;

(c) comparing the new Count variable to a preselected number;

(d) producing a first signal for changing states of the HVAC equipment from a first state to a second state, resetting the Count variable to said initial variable and moving to a step (e) if the new Count variable exceeds the preselected number, and returning to step (b) otherwise;

(e) creating a second new Count variable which is equal to said Count variable plus the droop minus a second difference between said setpoint and said room temperature;

(f) comparing said second new Count variable to said preselected number; and

(g) producing a second signal to change states of the HVAC equipment from said second state to said first state, resetting said Count variable to said initial value and returning to step (b) if said second new Count variable exceeds the preselected number, and returning to step (e) otherwise.

2. The method of claim 1, wherein:

said calculations of said first and second new Count variables in steps (b) and (e) include addition of a constant to said sums, said constant being chosen to cause the process to better model a preselected mechanical anticipator.