Self-calibrating water fluid control apparatus

• US 5,570,869 A
• Filed: 12/20/1994
• Issued: 11/05/1996
• Est. Priority Date: 12/20/1994
• Status: Expired due to Fees

• Current Assignee: T & S Brass and Bronze Incorporated
• Original Assignee: T & S Brass and Bronze Incorporated
• Inventors: Diaz, Alexander R., Roush, Ronald L.
• Primary Examiner(s): Look, Edward K.
• Assistant Examiner(s): VERDIER, CHRISTOPHER M
• Application Number:
  US08/359,439
• Time in Patent Office: 686 Days
• Field of Search: 251/129.04, 4/623, 4/304, 4/DIG. 3, 250/221, 250/221.1, 250/205
• US Class Current: 251/129.04
• CPC Class Codes: E03C 1/057 touchless, i.e. using sensors

Abstract

A self-calibrating fluid flow control apparatus for use with a fluid flow source is provided. A detection area is defined wherein the interposition of an object therein causes a control device to activate the fluid flow source. A calibrating device is configured to continuously define, at a predetermined rate, a steady state boundary of the detection area, wherein the steady state boundary conforms to objects interposed within said detection area so that a new detection area is defined which is free of interposed objects capable of activating the fluid flow source. An object left indefinitely within the detection area will not, therefore, cause the control device to indefinitely activate the fluid flow source nor, after deactivation by a timing mechanism, prevent the fluid flow source'"'"'s subsequent reactivation.

Claims

1. A continuously self-calibrating fluid flow control apparatus for utilization with a fluid flow source, comprising:

an infrared signal source configured to repeatedly emit, at a predetermined rate, an infrared signal into a defined detection area;

an infrared receiver configured to receive reflections of said infrared signals from objects within said detection area and generate electrical signals corresponding to said reflections;

a calibrating mechanism in communication with said infrared receiver and said infrared signal source and configured to compare said received infrared signal to at least one predetermined reference signal and adjust, responsive to said comparison, the intensity of infrared signals subsequently emitted by said infrared signal source so that the subsequent electrical signals corresponding to reflections therefrom approach said at least one predetermined reference signal; and

a control mechanism in communication with said infrared receiver and configured to output, responsive to said electrical signals, fluid flow source control signals to the fluid flow source, wherein said control mechanism is further configured so that when said electrical signals approximate said at least one reference signal, the fluid flow source is not activated.

2. The continuously self-calibrating fluid flow control apparatus as in claim 1, further comprising an interface device operatively disposed between said control mechanism and the fluid flow source and configured to present said fluid flow source control signals to the fluid flow source in a form actable upon by the fluid flow source.

3. The continuously self-calibrating fluid flow control apparatus as in claim 1, wherein said control mechanism further comprises a timing mechanism in communication with said control mechanism and configured to deactivate the fluid flow source after a predetermined activation period and to prevent the subsequent activation of the fluid flow source until at least one of the removal of said objects from said detection area and the approximation of said electrical signals to said at least one predetermined reference signal.

4. A water faucet assembly, comprising:

a faucet operatively connected to a water source;

a valve configured to selectively permit water flow from said water source to said faucet; and

a continuously self-calibrating water flow control apparatus operatively connected to said valve;

comprising;

a control device configured to open said valve, thereby activating said faucet, upon the interposition of an object within a defined detection area relative to said faucet; and

a calibrating device in communication with said control device and configured to continuously define, at a predetermined rate, a steady state boundary of said detection area conforming to objects interposed within said detection area such that said conforming steady state boundary excludes objects capable of activating the faucet.

5. The water faucet assembly as in claim 4, wherein said control device further comprises a timing mechanism configured to deactivate the water flow source after a predetermined activation period.

6. The water faucet assembly as in claim 5, further comprising a power source operatively connected to said continuously self-calibrating water flow control apparatus.

7. The water faucet assembly as in claim 5, wherein said control device comprises:

an infrared signal source configured to emit an infrared signal into said detection area;

an infrared receiver configured to receive reflections of said infrared signals from objects within said detection area and generate electrical signals corresponding to said reflections; and

a control mechanism configured to output, responsive to said electrical signals corresponding to said reflections of said infrared signals, water flow control signals to said valve capable of controlling the operation of said valve, and

wherein said calibrating device comprises a calibrating mechanism configured to compare said electrical signals to at least one predetermined reference signal and adjust, responsive to said comparison, the intensity of infrared signals subsequently emitted by said infrared signal source so that the subsequent electrical signals corresponding to reflections therefrom approach said at least one predetermined reference signal.

8. A continuously self-calibrating fluid flow control apparatus for utilization with a fluid flow system, comprising:

a control device mateable with said fluid flow system and configured to activate a water flow source of the fluid flow system upon the interposition of an object within a defined detection area; and

a calibrating device in communication with said control device and configured to continuously redefine, at a predetermined rate, a steady state boundary of said detection area, wherein said steady state boundary conforms to objects interposed within said detection area so that a new detection area is defined which is free of interposed objects capable of activating the fluid flow system.

9. The continuously self-calibrating fluid flow control apparatus as in claim 8, wherein said control device is configured to activate said fluid flow source when said object is interposed at a predetermined position within said detection area and wherein the relationship between said predetermined position and the position of said boundary is preserved by said calibrating device.

10. The continuously self-calibrating fluid flow control apparatus as in claim 8, wherein said control device comprises:

an infrared signal source configured to emit an infrared signal into said detection area;

an infrared receiver configured to receive reflections of said infrared signals from objects within said detection area and to generate electrical signals corresponding to said reflections; and

a control mechanism in communication with said infrared receiver and configured to output, responsive to said electrical signals corresponding to said reflections of said infrared signals, fluid flow source control signals to the fluid flow source.

11. The continuously self-calibrating fluid flow control apparatus as in claim 10, wherein said control device further comprises a timing mechanism in communication with said control mechanism and configured to deactivate the fluid flow source after a predetermined activation period.

12. The continuously self-calibrating fluid flow control apparatus as in claim 10, further comprising an interface device operatively disposed between said control mechanism and the fluid flow source and configured to present said fluid flow source control signals to the fluid flow source in a form actable upon by the fluid flow source.

13. The continuously self-calibrating fluid flow control apparatus as in claim 10, wherein said control mechanism is comprised of a microprocessor.

14. The continuously self-calibrating fluid flow control apparatus as in claim 10, wherein said calibrating device is configured to repeatedly compare said electrical signals to predetermined criteria and calibrate, responsive to said comparison, the infrared signals subsequently emitted by said infrared signal source so that the subsequent electrical signals corresponding to reflections therefrom approach said predetermined criteria.

15. The continuously self-calibrating fluid flow control apparatus as in claim 14, wherein said control mechanism is configured such that when said electrical signals approximately satisfy said predetermined criteria, the fluid flow source is not activated.

16. The continuously self-calibrating fluid flow control apparatus as in claim 14, wherein said predetermined criteria comprise at least one reference signal corresponding to a desired intensity of said reflected signals.

17. The continuously self-calibrating fluid flow control apparatus as in claim 10, wherein said calibrating device is comprised of electrical circuitry configured to repeatedly compare said electrical signals to at least one predetermined reference signal and adjust, responsive to said comparison, the intensity of infrared signals subsequently emitted by said infrared signal source so that the subsequent electrical signals corresponding to reflections therefrom approach said at least one predetermined reference signal and wherein said control mechanism is configured such that when said electrical signals approximate said at least one reference signal, the fluid flow source is not activated.

18. The continuously self-calibrating fluid flow control apparatus as in claim 14, wherein said calibrating device is configured to adjust the intensity of said infrared signals at a predetermined rate, wherein said predetermined rate is set to permit the activation of the fluid flow source during a desired use.

19. The continuously self-calibrating fluid flow control apparatus as in claim 10, wherein said calibrating device comprises a microprocessor.

20. The continuously self-calibrating fluid flow control apparatus as in claim 8, wherein said continuously self-calibrating fluid flow control apparatus is configured to be retrofitted into a fluid flow assembly.

21. The continuously self-calibrating fluid flow control apparatus as in claim 10, wherein said calibrating device is configured to repeatedly compare said electrical signals to predetermined criteria and adjust, responsive to said comparison, said predetermined criteria so that said adjusted criteria approach the electrical signals corresponding to reflections from subsequently emitted infrared signals.

22. The continuously self-calibrating fluid flow control apparatus as in claim 21, wherein said calibrating device is configured such that when said electrical signals approximately satisfy said predetermined criteria, the fluid flow source is not activated.

23. The continuously self-calibrating fluid flow control apparatus as in claim 8, further comprising a power source operatively connected to said control device and said calibrating device.

24. The water faucet assembly as in claim 23, wherein said power source comprises a battery.

25. A method of controlling fluid flow from a fluid flow assembly, comprising:

selectively permitting, upon the interposition of an object within a defined detection area, fluid flow from the fluid flow assembly; and

continuously defining, at a predetermined rate, a steady state boundary of said detection area to conform to objects interposed within said detection area so that said conforming steady state boundary excludes objects capable of activating the fluid flow assembly.

26. The method as in claim 25, wherein the fluid flow assembly is activated when said object is interposed at a predetermined position within said detection area and wherein the relationship between said predetermined position and the position of said boundary is preserved during said defining step.

27. The method as in claim 25, wherein said permitting step further comprises the steps of:

emitting infrared signals into said detection area;

receiving reflections of said infrared signals from objects within said detection area and generating electrical signals corresponding to said reflections; and

outputting, responsive to said electrical signals corresponding to said reflections of said infrared signals, fluid flow assembly control signals to the fluid flow assembly.

28. The method as in claim 27, wherein said defining step further comprises the steps of:

repeatedly comparing said electrical signals to predetermined criteria; and

calibrating, responsive to said comparison, the infrared signals subsequently emitted during subsequent said emitting steps so that the subsequent electrical signals corresponding to reflections therefrom approach said predetermined criteria.

29. The method as in claim 28, wherein when said electrical signals approximate said predetermined criteria, the fluid flow assembly is not activated.

30. The method as in claim 28, wherein the intensity of said infrared signals is calibrated at a predetermined rate set to permit the activation of the fluid flow assembly during a desired use.

31. The method as in claim 25, wherein said permitting step is further comprised of the steps of:

emitting, at a predetermined rate, infrared signals into said detection area;

receiving reflections of said infrared signals from objects within said detection area and generating electrical signals corresponding to said reflections;

outputting, responsive to said electrical signals corresponding to said reflections of said infrared signals, fluid flow assembly control signals to the fluid flow assembly such that when said electrical signals approximate said at least one predetermined reference signal, the fluid flow assembly is not activated; and

presenting said fluid flow assembly control signals to the fluid flow assembly in a form actable upon by the fluid flow assembly; and

wherein said defining step further comprises the steps of comparing said received infrared signals to said at least one predetermined reference signal and adjusting, responsive to said comparison, the intensity of infrared signals subsequently emitted during subsequent said emitting steps so that the subsequent electrical signals corresponding to reflections therefrom approach said at least one predetermined reference signal.

32. The method of claim 31, wherein said permitting step further comprises the steps of:

deactivating the fluid flow assembly upon the expiration of a predetermined activation period; and

preventing reactivation of the fluid flow assembly until at least one of the removal of said objects from said detection area and the approximation of said electrical signals to said at least one predetermined reference signal.

33. The method as in claim 27, wherein said defining step further comprises the steps of:

repeatedly comparing said electrical signals to predetermined criteria; and

adjusting, responsive to said comparison, said predetermined criteria so that said adjusted criteria approach the electrical signals corresponding to reflections from subsequently emitted infrared signals.

34. The method as in claim 33, wherein when said electrical signals approximately satisfy said predetermined criteria, the fluid flow assembly is not activated.

35. The method as in claim 27, wherein said defining step further comprises the steps of:

repeatedly comparing said electrical signals to at least one predetermined reference signal; and

adjusting, responsive to said comparison, said at least one predetermined reference signal so that said adjusted at least one reference signal approaches the subsequent electrical signals corresponding to reflections of said infrared signals, and

wherein when said adjusted at least one reference signal approximates said electrical signals, the fluid flow assembly is not activated.