Method and apparatus for an energy saving heating, ventilation, and air conditioning (HVAC) control system

• US 9,791,872 B2
• Filed: 03/14/2013
• Issued: 10/17/2017
• Est. Priority Date: 03/14/2013
• Status: Active Grant

• Current Assignee: Pelco (Schneider Electric SE)
• Original Assignee: Pelco (Schneider Electric SE)
• Inventors: Wang, Lei, Aghdasi, Farzin
• Primary Examiner(s): Bahta, Kidest
• Application Number:
  US13/827,717
• Publication Number:
  US 20140277757A1
• Time in Patent Office: 1,678 Days
• 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 11/46 Improving electric energy efficiency or saving
• CPC Class Codes: F24F 11/63 Electronic processing
• CPC Class Codes: F24F 2120/10 Occupancy
• CPC Class Codes: G05D 23/1927 using a plurality of sensors G05D23/1902, G05D23/1917, and G05D23/1919 take precedence

Abstract

Embodiments of methods and apparatus disclosed herein may employ depth, visual, or motions sensors to enable three-dimensional people counting and data mining to enable an energy saving heating, ventilation, and air conditioning (HVAC) control system. Head detection methods based on depth information may assist people counting in order to enable an accurate determination of room occupancy. A pattern of activities of room occupancy may be learned to predict the activity level of a building or its rooms, reducing energy usage and thereby providing a cost savings.

Claims

1. A method of controlling environmental comfort of at least one boundary zone, the method comprising:

monitoring a depth sensor mounted in proximity of an entrance, exit, or pathway of the at least one boundary zone to detect motion of living beings entering or leaving the at least one boundary zone through at least one detection zone, the at least one boundary zone having parameters associated therewith available to be used in adjusting an environmental control setting of the at least one boundary zone;

determining a number of living beings present in the at least one boundary zone based on the motion detected through the at least one detection zone;

monitoring at least one motion or visual sensor mounted within the at least one boundary zone for detecting motion of living beings within a respective interior space of the at least one boundary zone;

collecting motion or visual data from the at least one motion or visual sensor mounted within the at least one boundary zone to verify and provide error correction for the number of living beings present in the at least one boundary zone determined based on the motion detected through the at least one detection zone; and

determining at least one environmental control setting to enable control of environmental comfort of the at least one boundary zone based on the number of living beings determined, error correction associated therewith, and the parameters associated with the at least one boundary zone.

2. The method according to claim 1, wherein the parameters associated with the at least one boundary zone include dimensions for the at least one boundary zone, an exhaust fan size for a fan corresponding to the at least one boundary zone, or a combination thereof.

3. The method according to claim 1 further comprising:

collecting depth data from the depth sensor monitored to enable statistical modeling used to predict a future number of living beings present in the boundary zone at a given future time.

4. The method according to claim 3, wherein the depth sensor includes an infrared laser projector coupled to a monochrome complementary metal-oxide-semiconductor (CMOS) sensor configured to capture three-dimensional video data under varying ambient light conditions.

5. The method according to claim 1, further comprising receiving depth data from a depth sensor, wherein determining the number of living beings present in the at least one boundary zone includes counting the living beings entering and exiting the at least one boundary zone based on the depth data received.

6. The method according to claim 5, further including utilizing depth segmentation and head detection methods on the depth data received to enable counting the living beings.

7. The method according to claim 1, further including:

deriving a range for a head size of a measured living being at a given distance from a depth sensor based on measurements of the measured living being and depth data of the measured living being collected from the depth sensor; and

receiving depth data from the depth sensor, wherein determining the number of living beings present in the at least one boundary zone includes counting the living beings entering and exiting the at least one boundary zone by detecting heads of the living beings based on the depth data received and the range for the head size derived.

8. The method according to claim 7 wherein the range for the head size includes a width and radius for the head size in pixels.

9. The method according to claim 1, wherein the at least one boundary zone is at least one of a room, building, or portion of building.

10. The method according to claim 1, further comprising controlling heating, ventilation, or air conditioning for the at least one boundary zone based on the at least one environmental control setting determined.

11. The method according to claim 1, further comprising:

learning an activity pattern for occupancy of the at least one boundary zone by associating a timestamp with the number of living beings determined; and

controlling heating, ventilation, or air conditioning for the at least one boundary zone based on the at least one environmental control setting determined and the activity pattern learned.

12. The method according to claim 11 wherein controlling heating, ventilation, or air conditioning for the at least one boundary zone includes adjusting the heating, ventilation, or air conditioning levels before or after the at least one boundary zone is occupied based on the activity pattern learned.

13. An apparatus for controlling environmental comfort of at least one boundary zone, the apparatus comprising:

a sensing module configured to monitor a depth sensor mounted in proximity of an entrance, exit, or pathway of the at least one boundary zone to detect motion of living beings entering or leaving at least one boundary zone through at least one detection zone, the at least one boundary zone having parameters associated therewith available to be used in adjusting an environmental control setting of the at least one boundary zone;

a data center module configured to determine a number of living beings present in the at least one boundary zone based on the motion detected though the at least one detection zone, wherein the data center module is further configured to monitor an output of at least one motion or visual sensor mounted within the at least one boundary zone to detect motion of living beings within a respective interior space of the at least one boundary zone and to collect motion or visual data from the output monitored to provide error correction for the number of living beings present in the at least one boundary zone determined based on the motion detected though the at least one detection zone; and

a heating, ventilation, and air conditioning (HVAC) control module configured to determine at least one environmental control setting used to control environmental comfort of the at least one boundary zone based on the number of living beings determined, error correction associated therewith, and the parameters associated with the at least one boundary zone.

14. The apparatus according to claim 13, wherein the parameters associated with the at least one boundary zone include at least one of dimensions for the at least one boundary zone or an exhaust fan size for a fan corresponding to the at least one boundary zone.

15. The apparatus according to claim 13, wherein the sensing module further includes a motion detection module configured to detect motion by monitoring an output of the depth sensor and to collect depth data from the output monitored to enable statistical modeling used to predict a future number of living beings present in the boundary zone at a given future time.

16. The apparatus according to claim 15, wherein the depth sensor includes an infrared laser projector coupled to a monochrome complementary metal-oxide-semiconductor (CMOS) sensor configured to capture three-dimensional video data under varying ambient light conditions.

17. The apparatus according to claim 13, wherein the HVAC control module is further configured to control heating, ventilation, or air conditioning for the at least one boundary zone based on the at least one environmental control setting determined.

18. The apparatus according to claim 13, wherein the data center module is further configured to receive depth data from a depth sensor and motion data from a motion or visual sensor and further configured to determine the number of living beings present in the at least one boundary zone based on the depth data and the motion data received, and still further wherein optionally the motion data includes visual data of the at least one boundary zone.

19. The apparatus according to claim 18, wherein the data center module is further configured to analyze the depth data received and perform depth segmentation and head detection methods on the depth data received to enable counting the living beings.

20. The apparatus according to claim 13, wherein the data center module is further configured to learn an activity pattern for occupancy of the at least one boundary zone by associating a timestamp with the number of living beings determined and wherein the HVAC control module is further configured to control heating, ventilation, or air conditioning for the at least one boundary zone based on the at least one environmental control setting determined and the activity pattern learned.

21. The apparatus according to claim 20 wherein the HVAC control module includes an adjustment module to adjust heating, ventilation, or air conditioning levels before or after the at least one boundary zone is occupied based on the activity pattern learned.

22. The apparatus according to claim 13, wherein the parameters associated with the at least one boundary zone include at least one:

of dimensions for the at least one boundary zone or an exhaust fan size for a fan corresponding to the at least one boundary zone.

23. A non-transitory computer-readable medium having encoded thereon a sequence of instructions which, when loaded and executed by a processor, causes the processor to:

monitor a depth sensor mounted in proximity of an entrance, exit or pathway of the at least one boundary zone to detect motion of living beings entering or leaving at least one boundary zone through at least one detection zone, the at least one boundary zone having parameters associated therewith available to be used in adjusting an environmental control setting of the at least one boundary zone;

determine a number of living beings present in the at least one boundary zone based on the motion detected through the at least one detection zone;

monitor at least one motion or visual sensor mounted within the at least one boundary zone to detect motion of living beings within a respective interior space of the at least one boundary zone; and

collect motion or visual data from the at least one motion or visual sensor mounted within the at least one boundary zone to verify and provide error correction for the number of living beings present in the at least one boundary zone determined based on the motion detected through the at least one detection zone; and

determine at least one environmental control setting to enable control of environmental comfort of the at least one boundary zone based on the number of living beings determined, error correction associated therewith, and the parameters associated with the at least one boundary zone.

24. A method for controlling heating, ventilation, or air conditioning (HVAC), the method comprising:

building a probability distribution of the number of counts of living beings for at least one boundary zone during at least one time period to determine at least one HVAC control mode, the at least one HVAC control mode providing environmental comfort to the at least one boundary zone based on counts of living beings occupying the at least one boundary zone;

building a statistical model including the probability distribution, the statistical model being configured to predict at least one HVAC control mode to use for a given time period based on a previous HVAC control mode of the at least one HVAC control mode having been used for a previous time period corresponding to the given time period;

updating the probability distribution based on counting the number of living beings in the at least one boundary zone for the given time period to adjust a predication of a future HVAC control mode of the at least one HVAC control mode; and

controlling HVAC for the at least one boundary zone for the given time period using HVAC control mode predictions from the statistical model.

25. The method of claim 24 further comprising:

collecting historical data including count information of living beings in the at least one boundary zone for at least one previous time period;

including a Kalman filter in the statistical model; and

configuring the Kalman filter included to predict counts of living beings in the at least one boundary zone based on the historical data collected.

26. The method of claim 25 wherein the Kalman filter is a linear Kalman filter.

27. The method of claim 24 wherein the given time period is a time of day, day, week, month, year, or weekend.

28. The method of claim 24 wherein the at least one boundary zone is a room, corridor, elevator, stairway, building, open space of the building, or a combination thereof.