METHOD AND DEVICE FOR ADJUSTING A SET POINT

• US 20160239002A1
• Filed: 09/25/2013
• Published: 08/18/2016
• Est. Priority Date: 09/25/2013
• Status: Active Application

• Current Assignee: Schneider Electric Buildings LLC (Schneider Electric SE)
• Original Assignee: Schneider Electric Buildings LLC (Schneider Electric SE)
• Inventors: LFGREN, Fredrik, BIRGER, Lars
• Application Number:
  US15/024,573
• Publication Number:
  US 20160239002A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G05B 15/02 electric
• CPC Class Codes: G05B 19/0423 Input/output

Abstract

The present invention relates to a building control system, and more particular to a method and a device for set point adjustment in a building control system. The device (308) for set point adjustment comprises an active sensor configured to sense the distance to an object (310), for example at a first distance (304) and at a second distance (312). In response to sensing the movement of the object (310), the device (308) adjusts the set point from a first set point to a second set point. The second set point depends on the first set point and an offset between the first distance (304) and the second distance (312).

Claims

1. A method for set point adjustment in a building control system, comprising the steps of:

sensing (S602) an object (310) at a first distance (304) from an active sensor (202), whereby the set point adjustment is initiated;

sensing (S604) a movement of the object (310) from the first distance (304) to a second distance (312, 412) from the active sensor (202); and

adjusting (S606) the set point from a first set point to a second set point in response to sensing the movement of the object (310), wherein the second set point depends on the first set point and an offset between the first distance (304) and the second distance (312, 412).

2. The method of claim 1, wherein in the step of adjusting the set point, the second set point further depends on the time the object (310) is sensed at the second distance (312).

3. The method of claim 2, wherein the difference between the second set point and the first set point is proportional to the time the object (310) is sensed at the second distance (312).

4. The method of claim 2, wherein if the time the object (310) is sensed at the second distance (312) is less than a minimum set point adjustment time, the set point is not adjusted.

5. The method of claim 3, wherein the time is measured in discrete steps.

6. The method of claim 2, wherein the step of adjusting the set point comprises increasing or decreasing the set point depending on whether the offset is positive or negative.

7. The method of claim 1, wherein the difference between the second set point and the first set point is proportional to the offset.

8. The method of claim 7, wherein the offset is measured in discrete steps.

9. The method of claim 7, further comprising the steps of:

sensing a further movement of the object (310) from the second distance (412) to a third distance (414) from the active sensor (202); and

adjusting the set point from the second set point to a third set point in response to sensing the further movement of the object (310), wherein the difference between the third set point and the second set point is proportional to an offset between the second distance (412) and the third distance (414).

10. The method of claim 1, further comprising the steps of:

sensing that the object (310) is removed from a sensing area of the active sensor (202); and

in response thereto, terminating the set point adjustment.

11. The method of claim 1, wherein the set point adjustment is further initiated by:

sensing the object (310) at the first distance (304) for a certain period of time.

12. The method of claim 1, wherein the set point adjustment is further initiated by:

sensing a movement of the object (310) from a start distance (502) to the first distance (304).

13. The method of claim 12, wherein the set point adjustment is further initiated by:

sensing that a speed of the movement (512) of the object (310) from the start distance (502) to the first distance (304) is within a certain range.

14. The method claim 1, comprising the step of:

generating a feedback indicative of that the set point adjustment is initiated.

15. The method of any one of claim 1, comprising the step of:

generating a feedback indicative of the adjusted set point.

16. A device (100, 308, 408, 508) for set point adjustment in a building control system, comprising:

an active sensor (202) configured to;

sense an object at a first distance from the active sensor, whereby the set point adjustment is initiated;

sense a movement of the object from the first distance to a second distance from the active sensor; and

a processing unit (204) connected to the active sensor (202) and configured to;

adjust the set point from a first set point to a second set point in response to the active sensor (202) sensing a movement of the object, wherein the second set point depends on the first set point and an offset between the first distance and the second distance.

17. The device of claim 16, wherein the active sensor (202) is one of an IR-sensor, an ultra sound sensor and a laser sensor.