Multi-mode auto changeover system

• US 10,190,788 B2
• Filed: 07/14/2016
• Issued: 01/29/2019
• Est. Priority Date: 03/15/2013
• Status: Active Grant

• Current Assignee: Ademco Inc. (Resideo Technologies, Inc.)
• Original Assignee: Honeywell International Inc.
• Inventors: Schnell, Robert J., Nichols, Steven C.
• Primary Examiner(s): Norman, Marc
• Application Number:
  US15/209,987
• Publication Number:
  US 20160320086A1
• Time in Patent Office: 929 Days
• Field of Search: 236 1 C
• 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 11/52 Indication arrangements, e.g. displays
• CPC Class Codes: F24F 11/58 using Internet communication
• 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 11/65 for selecting an operating mode
• CPC Class Codes: F24F 11/67 Switching between heating and cooling modes
• CPC Class Codes: F24F 2110/10 Temperature

Abstract

An auto changeover mechanism for a thermostat. A heat and cool mode auto changeover with single or crossed setpoints may be an approach for doing a single setpoint auto changeover, an approach that can handle auto changeover with separate heat and cool setpoints that do not require the cool setpoint to always be higher than the heat setpoint, and also an approach that does not necessarily require a dead band between the setpoints. A hysteresis may be associated with switching to the other mode. The thermostat having the auto changeover mechanism may have a display of a mode that automatically changes between heat and cool.

Claims

1. A thermostat comprising:

a cool mode and heat mode mechanism having a connection for controlling a building heating and cooling system for affecting a temperature of a space;

a temperature setpoint mechanism, having cool and heat setpoints that are adjustable, connected to the cool mode and heat mode mechanism; and

an auto changeover connected to the temperature setpoint mechanism; and

wherein;

the auto changeover is configured to switch the thermostat from one mode to another mode according to the temperature of the space for a set amount of time relative to the cool and heat setpoints and hystereses above and below the cool and heat setpoints, respectively;

the auto changeover is configured to occur at each of the cool setpoint is less than the heat setpoint, the cool and heat setpoints are the same, and the cool setpoint is greater than the heat setpoint.

2. The thermostat of claim 1, wherein:

the auto changeover switches from a heat mode to a cool mode when the temperature of the space is X degrees F. or more above the heat setpoint for W minutes of time; and

the auto changeover switches from the cool mode to the heat mode when the temperature of the space is Y degrees F. or more below the cool setpoint for Z minutes of time.

3. The thermostat of claim 2, wherein:

X ranges from 0.0 to virtually any number;

Y ranges from 0.0 to virtually any number;

X can vary with time;

Y can vary with time;

X and Y are not necessarily the same number;

W ranges from 0.0 to virtually any number;

Z ranges from 0.0 to virtually any number;

W can vary with time;

Z can vary with time; and

W and Z are not necessarily the same number.

4. The thermostat of claim 1, further comprising:

a user interface having a display; and

wherein the display shows a mode which automatically changes between heat and cool to indicate the mode of the thermostat.

5. The thermostat of claim 1, wherein:

if a mode is unknown and the temperature of the space is below the heat setpoint and the cool setpoint, then the auto changeover will start in a heat mode;

if the mode is unknown and the temperature of the space is above the heat setpoint and the cool setpoint, then the auto changeover may start in a cool mode;

or

if the mode is unknown and the temperature of the space is between the heat setpoint and the cool setpoint, then the auto changeover may start in the mode of whichever setpoint is closest to the temperature of the space.

6. The thermostat of claim 1, wherein:

the auto changeover can be overridden by manually selecting a heat mode or a cool mode; and

the auto changeover can be reinstated by a manual retrigger, a time-out retrigger, or a retrigger of conditions that cause switching between the heat mode and the cool mode.

7. The thermostat of claim 1, wherein the building heating and cooling system is a heating, ventilation and air conditioning (HVAC) system.

8. A thermostat system comprising:

a thermostat hardware device; and

wherein;

the thermostat hardware device comprises;

a cool mode and heat mode mechanism having a connection for controlling a building heating and cooling system for affecting a temperature of a space;

a temperature setpoint mechanism, having cool and heat setpoints that are adjustable, connected to the cool mode and heat mode mechanism; and

an auto changeover connected to the temperature setpoint mechanism; and

wherein;

the auto changeover is configured to switch the thermostat from one mode to another mode according to the temperature of the space relative to the cool and heat setpoints; and

the auto changeover occurs at each of the cool setpoint greater than, less than, and equal to the heat setpoint.

9. The system of claim 8, may further comprise

a mobile application;

and

a cloud connected to the mobile application and to the thermostat hardware device.

10. The system of claim 8, wherein the cool and heat setpoints are situated between zero and any number of degrees F. apart from each other.

11. The system of claim 8, wherein:

the auto changeover switches from a heat mode to a cool mode when the temperature of the space is X degrees F. or more above the heat setpoint and after transitioning for a period of Y minutes at the temperature of the space of X degrees F. or more above the heat setpoint; and

the auto changeover switches from the cool mode to the heat mode when the temperature of the space is X degrees F. or more below the cool setpoint and after transitioning for a period of Y minutes at the temperature of the space of X degrees F. or more below the cool setpoint;

X ranges from zero to virtually any number;

Y ranges from zero to virtually any number; and

X and Y for switching to the cool mode are not necessarily the same as X and Y for switching to the heat mode.

12. A thermostat device for a heating, ventilation and air conditioning system of a building, comprising:

a user interface;

a controller configured to receive inputs from the user interface and to activate or deactivate one or more components of a heating, ventilation, and air conditioning system of a building;

an auto changeover connected to the controller, for switching from one mode to another mode according to a temperature of a space at a set amount of time relative to a time a temperature controlled space reaches a cool setpoint or heat setpoint, and having adjustable hystereses above and below the cool and heat setpoints, respectively; and

wherein;

the user interface displays a mode of the thermostat device and automatically indicates a heat or cool mode that is in effect; and

the cool setpoint is different from the heat setpoint and a minimum deadband is not required between the cool setpoint and the heat setpoint;

the user interface has a provision for receiving one or more one touch actions;

a one touch action is a user defined set of operations carried out across one or more devices at a press of a button switch; and

the one or more touch actions comprise a one touch action of a button switch actuates multiple device specific actions or a one touch action of a button switch for control of the temperature of the space comprises setting the heat setpoint and the cool setpoint;

a one touch action is an automatic action comprising a trigger to execute an action list, wherein the trigger is either true or false

when a trigger changes from false to true, then the action list is executed;

once the action list is executed, to execute the action list again, the trigger needs to change back to false and then to true; and

the action list comprises energizing a heating, ventilation and air conditioning (H-VAC) piece of equipment.

13. The device of claim 12, wherein:

a one touch action is an automatic action;

the automatic action comprises a time or trigger, and an optimal enable condition;

triggers and enable conditions are either true or false; and

a trigger is a temperature.

14. The device of claim 13, wherein if a parameter of the automatic action is manually changed it overrides the automatic action.

15. The device of claim 14, further comprising:

an action button for executing all automatic actions having triggers that have an evaluation of true; and

wherein the action button gives a user an ability to cancel overrides of triggers of automatic actions.

16. The device of claim 12, wherein:

a setpoint is shown at the user interface when the mode is shown;

when a system switch is on the heat mode, the setpoint is the heat setpoint, and the heat setpoint can be modified by manually changing the setpoint shown;

when the system switch is on the cool mode, the setpoint is the cool setpoint, and the cool setpoint can be modified by manually changing the setpoint shown; and

when the system switch is at off, then no setpoint is shown and the heat setpoint or the cool setpoint cannot be manually changed.

17. The device of claim 12, wherein:

the auto changeover is always allowed; and

the auto changeover can be manually deactivated and activated.

18. The device of claim 17, further comprising:

an emergency heat component having a button to activate emergency heat; and

wherein;

when the emergency heat is activated, a system switch automatically changes the thermostat device to heat and the auto changeover is automatically deactivated;

when the auto changeover is activated, the emergency heat is deactivated; and

when the system switch is changed to cool or off, the emergency heat is automatically deactivated.