Method and system for controlling a solid product release mechanism

• US 5,922,030 A
• Filed: 12/19/1996
• Issued: 07/13/1999
• Est. Priority Date: 12/20/1995
• Status: Expired due to Term

• Current Assignee: Uusi LLC (Nartron Corporation)
• Original Assignee: Nartron Corporation
• Inventors: Shank, David, Taylor, Robert E.
• Primary Examiner(s): Terrell, William E.
• Assistant Examiner(s): Tran, Khoi H.
• Application Number:
  US08/772,027
• Time in Patent Office: 936 Days
• Field of Search: 700/479.01, 222/56, 222/1, 141/94, 141/95, 62/125, 62/126, 209/590
• US Class Current: 222/56
• CPC Class Codes: F25C 5/187 with ice level sensing means
• CPC Class Codes: G01D 5/48 using wave or particle radiation means G01D5/26 takes precedence
• CPC Class Codes: G01F 23/2967 for discrete levels
• CPC Class Codes: G01S 15/02 using reflection of acoustic waves G01S15/66 takes precedence
• CPC Class Codes: G05D 9/12 characterised by the use of electric means

Abstract

A method and system for controlling a solid product release mechanism to control the level of solid products in a storage bin. An acoustical wave is transmitted across either a passage of a delivery chute or a cavity of the storage bin. The strength of the transmitted acoustical wave is sensed. As the solid products fall from the release mechanism into the delivery chute or storage bin, a change in the strength of the acoustical wave signal is sensed. A control signal is generated to control the release mechanism when the change in the strength of the transmitted acoustical wave exceeds a predetermined threshold for more than a predetermined amount of time. A method and system is also provided for controlling an ice release mechanism in an automatic ice-making machine. A method and system is provided for automatically calibrating an ultrasonic ranging sensor used in determining the level of solid products in a storage bin. An apparatus is also provided for controlling a solid product release mechanism to control the level of solid products in a storage bin.

Claims

1. For use with a solid product release mechanism for releasing a plurality of solid products, a delivery chute having a passage for guiding the solid product from the solid product release mechanism to a storage bin, the storage bin for receiving and storing the solid product and having a cavity, a method for controlling the solid product release mechanism to control the level of solid products in the storage bin, the method comprising:

transmitting an acoustical wave across the passage of the delivery chute, the acoustical wave having a predetermined frequency based on a resonance of the delivery chute;

sensing a strength of the transmitted acoustical wave after the acoustical wave has traversed across the passage;

releasing the solid products into the passage of the delivery chute so as to change the strength of the transmitted acoustical wave;

sensing the change in the strength of the transmitted acoustical wave; and

generating a control signal when the change in the strength exceeds a predetermined threshold for more than a predetermined amount of time wherein the control signal is utilized to prevent the solid product release mechanism from releasing additional solid product.

2. The method as recited in claim 1 wherein the resonance is a resonant frequency of the physical structure of the delivery chute.

3. The method as recited in claim 1 wherein the resonance is a resonant frequency of the passage of the delivery chute.

4. The method as recited in claim 1 wherein the strength of the transmitted acoustical wave is an amplitude.

5. For use with a solid product release mechanism for releasing a plurality of solid products, a delivery chute having a passage for guiding the solid product from the solid product release mechanism to a storage bin, the storage bin for receiving and storing the solid product and having a cavity, a method for controlling the solid product release mechanism to control the level of solid products in the storage, the method comprising:

transmitting an acoustical wave across the cavity of the storage bin, the acoustical wave having a predetermined frequency based on a resonance of the storage bin;

sensing a strength of the transmitted acoustical wave after the acoustical wave has traversed across the cavity;

releasing the solid products into the cavity of the storage bin so as to change the strength of the transmitted acoustical wave;

sensing the change in the strength of the transmitted acoustical wave; and

generating a control signal when the change in the strength exceeds a predetermined threshold for more than a predetermined amount of time wherein the control signal is utilized to prevent the solid product release mechanism from releasing additional solid product.

6. The method as recited in claim 5 wherein the resonance is a resonant frequency of the cavity of the storage bin.

7. The method as recited in claim 5 wherein the strength of the transmitted acoustical wave is an amplitude.

8. For use with an automatic ice-making machine having an ice release mechanism for releasing ice, a delivery chute having a passage for guiding the ice from the ice release mechanism to a storage bin, the storage bin for receiving and storing the ice and having a cavity, a method for controlling the ice release mechanism to control the level of ice in the storage bin, the method comprising:

(a) transmitting an acoustical wave across one of the passage of the delivery chute and the cavity of the storage bin, the acoustical wave having a predetermined frequency based on a resonance of one of the delivery chute and the storage bin;

(b) sensing a strength of the transmitted acoustical wave after the acoustical wave has traversed across the one of the passage and the cavity;

(c) releasing the ice into the one of the passage and the cavity so as to change the strength of the transmitted acoustical wave;

(d) sensing the change in the strength of the transmitted acoustical wave; and

(e) generating a control signal when the change in the strength exceeds a predetermined threshold for more than a predetermined amount of time wherein the control signal is utilized to prevent the ice release mechanism from releasing additional ice.

9. The method as recited in claim 8 wherein the acoustical wave is transmitted across the passage of the delivery chute.

10. The method as recited in claim 9 wherein the resonance is a resonant frequency of the physical structure of the delivery chute.

11. The method as recited in claim 9 wherein the resonance is a resonant frequency of the passage of the delivery chute.

12. The method as recited in claim 8 wherein the acoustical wave is transmitted across the cavity of the storage bin.

13. The method as recited in claim 11 wherein the resonance is a resonant frequency of the cavity of the storage bin.

14. The method as recited in claim 8 wherein the strength of the transmitted acoustical wave is an amplitude.

15. The method as recited in claim 8 wherein the ice release mechanism includes an ice-maker for making ice and wherein the control signal is utilized to prevent the making of ice.

16. The method as recited in claim 8 wherein the step of transmitting the acoustical wave is performed utilizing a speaker.

17. The method as recited in claim 8 wherein the step of sensing the strength of the transmitted acoustical wave and the step of sensing the change in the strength is performed utilizing a microphone.

18. The method as recited in claim 8 wherein the step of transmitting the acoustical wave and the steps of sensing the strength and sensing the change in the strength is performed utilizing a piezoelectric element.

19. The method as recited in claim 8 wherein the step of transmitting the acoustical wave is performed utilizing a solenoid.

20. The method as recited in claim 8 further comprising the step of determining the resonance of the one of the delivery chute and the storage bin prior to step (a).

21. For use with a solid product release mechanism that releases solid products through a delivery chute having a passage for guiding the solid products from the release mechanism to a storage bin, the storage bin for receiving and storing the solid products and having a cavity, a system for controlling the solid product release mechanism to control the level of solid products in the storage bin, the system comprising:

means for transmitting an acoustical wave across the passage of the delivery chute, the acoustical wave having a predetermined frequency based on a resonance of the delivery chute;

a sensor for sensing a strength of the transmitted acoustical wave after the acoustical wave has traversed across the passage;

means for releasing the solid products into the passage of the delivery chute so as to change the strength of the transmitted acoustical wave;

the sensor for sensing the change in the strength of the transmitted acoustical wave; and

means for generating a control signal when the change in the strength exceeds a predetermined threshold for more than a predetermined amount of time wherein the control signal is utilized to prevent the solid product release mechanism from releasing additional solid product.

22. The system as recited in claim 21 wherein the resonance is a resonant frequency of the physical structure of the delivery chute.

23. The system as recited in claim 21 wherein the resonance is a resonant frequency of the passage of the delivery chute.

24. The system as recited in claim 21 wherein the strength of the transmitted acoustical wave is an amplitude.

25. For use with a solid product release mechanism that releases solid products through a delivery chute having a passage for guiding the solid products from the release mechanism to a storage bin, the storage bin for receiving and storing the solid products and having a cavity, a system for controlling the solid product release mechanism to control the level of solid products in the storage bin, the system comprising:

means for transmitting an acoustical wave across the cavity of the storage bin, the acoustical wave having a predetermined frequency based on a resonance of the storage bin;

a sensor for sensing a strength of the transmitted acoustical wave after the acoustical wave has traversed across the cavity;

means for releasing the solid products into the cavity of the storage bin so as to change the strength of the transmitted acoustical wave;

the sensor for sensing the change in the strength of the transmitted acoustical wave; and

means for generating a control signal when the change in the strength exceeds a predetermined threshold for more than a predetermined amount of time wherein the control signal is utilized to prevent the solid product release mechanism from releasing additional solid product.

26. The system as recited in claim 25 wherein the resonance is a resonant frequency of the cavity of the storage bin.

27. The system as recited in claim 25 wherein the strength of the transmitted acoustical wave is an amplitude.

28. For use with an automatic ice-making machine having an ice release mechanism that releases ice through a delivery chute having a passage for guiding the ice from the ice release mechanism to a storage bin, the storage bin for receiving and storing the ice and having a cavity, a system for controlling the ice release mechanism to control the level of ice in the storage bin, the system comprising:

means for transmitting an acoustical wave across one of the passage of the delivery chute and the cavity of the storage bin, the acoustical wave having a predetermined frequency based on a resonance of one of the delivery chute and the storage bin;

a sensor for sensing a strength of the transmitted acoustical wave after the acoustical wave has traversed across the one of the passage and the cavity;

means for releasing the ice into the one of the passage and the cavity so as to change the strength of the transmitted acoustical wave;

the sensor for sensing the change in the strength of the transmitted acoustical wave; and

means for generating a control signal when the change in the strength exceeds a predetermined threshold for more than a predetermined amount of time wherein the control signal is utilized to prevent the ice release mechanism from releasing additional ice.

29. The system as recited in claim 28 wherein the acoustical wave is transmitted across the passage of the delivery chute.

30. The system as recited in claim 29 wherein the resonance is a resonant frequency of the physical structure of the delivery chute.

31. The system as recited in claim 29 wherein the resonance is a resonant frequency of the passage of the delivery chute.

32. The system as recited in claim 29 wherein the acoustical wave is transmitted across the cavity of the storage bin.

33. The system as recited in claim 32 wherein the resonance is a resonant frequency of the cavity of the storage bin.

34. The system as recited in claim 28 wherein the strength of the transmitted acoustical wave is an amplitude.

35. The system as recited in claim 28 wherein the ice release mechanism includes an ice-maker for making ice and wherein the control signal is utilized to prevent the making of ice.

36. The system as recited in claim 28 wherein the means for transmitting the acoustical wave is a speaker.

37. The system as recited in claim 28 wherein the sensor for sensing the strength of the transmitted acoustical wave and for sensing the change in the strength is a microphone.

38. The system as recited in claim 28 wherein the means for transmitting the acoustical wave and the sensor for sensing the strength and sensing the change in the strength is a piezoelectric element.

39. The system as recited in claim 28 wherein the means for transmitting the acoustical wave is a solenoid.

40. The system as recited in claim 28 further comprising means for determining the resonance of the one of the delivery chute and the storage bin.

41. The system as recited in claim 40 wherein the means for determining the resonance comprises:

means for transmitting a plurality of acoustical waves each having a frequency;

the sensor for sensing the frequency of each of the acoustical waves and generating corresponding frequency signals; and

means for determining the frequency signal having the lowest frequency.

42. For use with an ice release mechanism that releases ice through a delivery chute having a passage for guiding the ice from the ice release mechanism to a storage bin, the storage bin for receiving and storing the ice and having a cavity, an apparatus for controlling the ice release mechanism to control the level of ice in the storage bin, the apparatus comprising:

a transmitter for transmitting an acoustical wave across one of the passage and the cavity, the acoustical wave having a predetermined frequency based on the resonance of one of the delivery chute or the storage bin;

a sensor for sensing a strength of the transmitted acoustical wave after the acoustical wave has traversed the one of the passage and the cavity;

a controller, coupled to the release mechanism, the transmitter and the sensor, for allowing at least one solid product to fall from the release mechanism into one of the passage and the cavity so as to change the strength of the transmitted acoustical wave;

the sensor for sensing the change in the strength of the transmitted acoustical wave; and

the controller for generating a control signal when the change in the strength exceeds a predetermined threshold for more than a predetermined amount of time wherein the control signal is utilized to prevent the solid product release mechanism from releasing additional ice.

43. The apparatus as recited in claim 42 wherein the transmitter is affixed to a wall of the delivery chute for transmitting the acoustical wave across the passage.

44. The apparatus as recited in claim 43 wherein the sensor is affixed to a wall of the delivery chute adjacent the transmitter.

45. The apparatus as recited in claim 43 wherein the sensor is affixed to a wall of the delivery chute opposite the transmitter.

46. The apparatus as recited in claim 42 wherein the transmitter is affixed to a wall of the storage bin for transmitting the acoustical wave across the cavity of the storage bin.

47. The apparatus as recited in claim 46 wherein the sensor is affixed to a wall of the storage bin adjacent the transmitter.

48. The apparatus as recited in claim 46 wherein the sensor is affixed to a wall of the storage bin opposite the transmitter.

49. The apparatus as recited in claim 42 wherein the transmitter and the sensor are affixed to a top portion of the storage bin for transmitting and sensing the acoustical wave across a portion of the cavity of the storage bin and further comprising a deflector plate for deflecting the transmitted acoustical wave for receipt by the sensor, the deflector plate positioned opposite the transmitter and the sensor in the storage bin and having a closed end and an open end, the closed end being secured to the top portion of the storage bin adjacent the transmitter and the sensor and the open end for receiving the ice as the storage bin begins to fill.

50. The apparatus as recited in claim 49 wherein the open end of the deflector plate is at an angle to the closed end of the deflector plate.

51. The apparatus as recited in claim 49 wherein the transmitter and the sensor are the same device.