Chiller with automatic probe detection and filtered temperature display

• US 6,311,509 B1
• Filed: 12/22/2000
• Issued: 11/06/2001
• Est. Priority Date: 12/22/2000
• Status: Expired due to Term

• Current Assignee: Premark FEG LLC (Illinois Tool Works Inc.)
• Original Assignee: Premark FEG LLC (Illinois Tool Works Inc.)
• Inventors: Boryca, Walter J., Smith, Al D., Edelmann, David Charles, Cartwright, Richard W.
• Primary Examiner(s): Tanner, Harry B.
• Application Number:
  US09/748,674
• Time in Patent Office: 319 Days
• Field of Search: 622/13, 622/03, 621/30, 622/281, 622/08, 621/29, 621/31, 621/25, 621/26, 621/27, 622/29, 236/15.BB, 236/51, 236/91.R, 236/91.A, 236/91.E
• US Class Current: 62/213
• CPC Class Codes: F25D 2400/36 Visual displays
• CPC Class Codes: F25D 2500/04 Calculation of parameters
• CPC Class Codes: F25D 2700/02 Sensors detecting door opening
• CPC Class Codes: F25D 2700/10 Sensors measuring the temperature of the evaporator
• CPC Class Codes: F25D 2700/12 Sensors measuring the inside temperature
• CPC Class Codes: F25D 2700/16 Sensors measuring the temperature of products
• CPC Class Codes: F25D 29/00 Arrangement or mounting of control or safety devices

Abstract

In a chiller, an apparatus and method for automatically identifying a temperature probe for use in a chilling operation is provided in order to reduce user error. In the place of manual selection by a user, automatic selection of the appropriate temperature probe is accomplished by comparing the temperature of the given temperature probe to a threshold temperature. An additional apparatus and method for filtering a displayed compartment temperature is provided to reduce user confusion. The responsiveness of the displayed temperature to temperature changes in the compartment is reduced when the compartment door is opened.

Claims

1. In a chiller including a chilling compartment and a plurality of temperature probes, a method for automatically identifying a temperature probe for use in a chilling operation, comprising the steps of:

(a) inserting at least one of a plurality of temperature probes into a hot food product to be chilled;

(b) obtaining a temperature from each of the plurality of temperature probes; and

(c) identifying, for use in a chilling operation, a temperature probe with a corresponding temperature that exceeds a threshold temperature.

2. The method of claim 1, further comprising the step of obtaining an air temperature of the chilling compartment.

3. The method of claim 2, wherein the threshold temperature is determined by adding a specified amount to the air temperature of the chilling compartment.

4. The method of claim 3, wherein the specified amount can be supplied by a user through a user input device.

5. The method of claim 3, wherein the specified amount is a predetermined constant.

6. The method of claim 1, wherein step (b) is initiated by a user through a user input device.

7. The method of claim 1, wherein step (b) is performed repeatedly.

8. The method of claim 1, further comprising the step of:

(d) obtaining a first temperature of each of the plurality of temperature probes at a first point in time, prior to step (b);

wherein in step (c) a distinct threshold temperature is determined for each of the plurality of temperature probes by adding a specified amount to the first temperature of each temperature probe.

9. The method of claim 8, wherein step (d) is performed prior to step (a).

10. The method of claim 8, wherein step (d) is performed after step (a).

11. The method of claim 8, wherein the specified amount can be supplied by a user through a user input device.

12. In a chiller including a chilling compartment having a plurality of temperature probes associated therewith, a method for automatically determining whether a given temperature probe has been selected for use in a chilling operation, the method comprising the steps of:

(a) comparing a temperature of the given temperature probe to a threshold temperature; and

(b) determining whether the given temperature probe has been selected for use in the chilling operation based at least in part upon the comparison made in step (a).

13. The method of claim 12 wherein, in step (b), the given temperature probe is determined to have been selected for use in the chilling operation only if the temperature of the given temperature probe exceeds the threshold temperature.

14. The method of claim 12 further comprising the step of:

(c) determining an air temperature within the chilling compartment;

wherein the threshold temperature of step (a) is a specified amount above the air temperature of the chilling compartment.

15. The method of claim 12, wherein the threshold temperature is a specified amount above a prior temperature of the given temperature probe as determined prior to step (b).

16. The method of claim 12 wherein the determination of step (b) is made in order to automatically identify the given probe for use in the chilling operation if a user selected the given probe by placing it in a hot food product.

17. The method of claim 12 comprising the further step of examining the given probe based upon user identification of the given probe via a user input device, wherein the determination of step (b) is made in order to verify that the user identification of the given probe was correct.

18. A chiller apparatus comprising:

a chilling compartment into which hot food products to be chilled are received;

a chilling system for cooling the chilling compartment;

a plurality of temperature probes insertable in food products for monitoring the temperatures of food products during chilling operations; and

a controller operatively coupled to the plurality of temperature probes for receiving signals therefrom, the controller operable to determine whether a given temperature probe has been selected for use in a chilling operation based, at least in part, on a signal received from the given temperature probe.

19. The chiller apparatus of claim 18, further comprising an air temperature sensor for obtaining an air temperature of the chilling compartment, wherein the controller is operatively coupled to the temperature sensor for receiving a signal therefrom, the controller further operable to determine whether the given temperature probe has been selected based, at least in part, on the signal received from the air temperature sensor.

20. The chiller apparatus of claim 19, wherein the controller is operable to determine whether the given temperature probe has been selected for use in the chilling operation based, at least in part, on a comparison of a threshold temperature to the temperature of the given temperature probe.

21. The chiller apparatus of claim 20, wherein the controller calculates the threshold temperature as a function of at least:

(i) the air temperature of the chilling compartment; and

(ii) a specified amount.

22. The chiller apparatus of claim 20, wherein the comparison is performed by the controller for each of the plurality of temperature probes that is not already being used in chilling operations.

23. The chiller apparatus of claim 18, wherein the controller is operable to determine whether to identify the given temperature probe for use in the chilling operation based, at least in part, on a comparison of a threshold temperature to a current temperature of the given temperature probe, wherein the controller calculates the threshold temperature as a function of a least:

(i) a prior temperature of the given temperature probe; and

(ii) a specified amount.

24. The chiller apparatus of claim 23, wherein the comparison is performed by the controller for each of the plurality of temperature probes that is not already being used in chilling operations.

25. The chiller apparatus of claim 18, wherein the determination of whether the given probe has been selected is made in order to automatically identify the given probe for use in the chilling operation if a user selected the given probe by placing it in a hot food product.

26. The chiller apparatus of claim 18, wherein the determination of whether the given probe has been selected is initiated based upon user identification of the given probe via a user input device, wherein the determination is made in order to verify that the user identification of the given probe was correct.

27. In a cooling apparatus including a cooling compartment and a door that opens to the cooling compartment, a method for displaying a temperature that is representative of an air temperature in the cooling compartment, wherein a status of the door as being open or closed affects a responsiveness of the temperature that is displayed to temperature changes in the cooling compartment.

28. The method of claim 27, comprising the steps of:

(a) measuring the air temperature in the cooling compartment repeatedly; and

(b) calculating the temperature that is displayed by averaging a plurality of measured air temperatures in the cooling compartment;

wherein a number of measured air temperatures to be averaged is increased at least once when the door is open.

29. The method of claim 28, wherein the number of measured air temperatures to be averaged is increased only if the door remains open for a given time.

30. The method of claim 27, comprising the steps of:

(a) when the door is closed;

(i) repeatedly measuring an air temperature in the cooling compartment; and

(ii) repeatedly calculating an average temperature as a function of previously measured air temperatures in the cooling compartment and displaying the average temperature;

(b) at least once when the door is open;

(i) calculating a new average temperature value as a function of both a new measured temperature and an old average temperature, wherein the old average temperature is weighted by some value greater than one, and displaying the new average temperature.

31. The method of claim 30, wherein step (b)(i) is performed only if the door remains open for a given time.

32. The method of claim 27, comprising the steps of:

(a) measuring the air temperature in the cooling compartment repeatedly; and

(b) calculating the temperature that is displayed by a averaging a plurality of measured air temperatures in the cooling compartment;

wherein a frequency with which step (a) is performed is decreased at least once when the door is open.

33. The method of claim 32, wherein the frequency with which step (a) is performed is decreased only if the door remains open for a given time.

34. The method of claim 27, comprising the steps of:

(a) measuring the air temperature in the cooling compartment repeatedly; and

(b) calculating the temperature that is displayed by averaging a plurality of measured air temperatures in the cooling compartment;

wherein a frequency with which step (b) is performed is decreased at least once when the door is open.

35. The method of claim 34, wherein the frequency with which step (b) is performed is decreased only if the door remains open for a given time.

36. The method of claim 27, wherein the cooling apparatus comprises one of a refrigerator and a chiller.

37. A cooling apparatus comprising:

a cooling compartment into which hot food products are received;

a door which can be opened to load or unload food products from the cooling compartment;

a door state sensor for monitoring an open/closed state of the door;

a cooling system for cooling the cooling compartment;

an air temperature sensor for obtaining an air temperature of the cooling compartment;

a display device for effecting display of information to a user;

a controller operatively coupled to the air temperature sensor for receiving a signal therefrom, the controller operable to repeatedly establish a display temperature for display by the display device based, at least in part, on the signal received from the air temperature sensor; and

wherein, the controller is operatively coupled to receive a signal from the door state sensor, the controller operable at least once during an open state of the door to reduce the responsiveness of the established display temperature to temperature changes in the cooling compartment.

38. The cooling apparatus of claim 37, wherein the controller is operable to calculate the display temperature by averaging a plurality of measured air temperatures in the cooling compartment, the controller further operable to increase a number of measured air temperatures to be averaged when the door is open.

39. The cooling apparatus of claim 37, wherein the controller is operable to calculate the display temperature as function of previously measured air temperatures in the cooling compartment, the controller further operable to calculate the display temperature as a function of a new measured air temperature in the cooling compartment and an old average of a plurality of measured air temperatures in the cooling compartment, wherein the old average is weighted by some value greater than one when the door is open.

40. The cooling apparatus of claim 37, wherein the controller is operable to calculate the display temperature by averaging a plurality of measured air temperatures in the cooling compartment, the controller further operable to decrease the frequency with which the air temperature of the cooling compartment is measured when the door is open.

41. The cooling apparatus of claim 37, wherein the controller is operable to calculate the display temperature by averaging a plurality of measured air temperatures in the cooling compartment, the controller further operable to decrease the frequency with which the display temperature is calculated when the door is open.

42. The cooling apparatus of claim 37, wherein the controller is operable to reduce the responsiveness of the established display temperature to temperature changes in the cooling compartment only if the door is determined to be open for a predetermined time period.