Food information monitoring system

• US 6,856,247 B1
• Filed: 04/25/2003
• Issued: 02/15/2005
• Est. Priority Date: 05/10/2002
• Status: Expired due to Fees

• Current Assignee: Unified Brands, Inc. (Electrolux Professional AB)
• Original Assignee: A La Cart, Inc.
• Inventors: Wallace, Thomas E.
• Primary Examiner(s): PHAM, TOAN NGOC
• Application Number:
  US10/423,309
• Time in Patent Office: 662 Days
• Field of Search: 340/539.16, 340/539.17, 340/679, 340/506, 340/501, 340/531, 340/584, 340/585, 340/588
• US Class Current: 340/539.16
• CPC Class Codes: G01K 1/026 arrangements for monitoring a plurality of temperatures, e.g. by multiplexing
• CPC Class Codes: G01K 2207/02 for measuring food temperature

Abstract

Systems and methods are provided for gathering temperature and other food condition information at a plurality of remote sensor units and transmitting it to a central collection location. Data may be buffered at each sensor unit until communications have been established between the unit and the central computer. A plurality of interface units may be provided for receiving data from the sensor units and relaying it to the central computer. At the central computer, the data may be compared to a preset limit, and if the limit is violated, an alarm may be generated at the corresponding remote sensor unit. If a deactivation request is received at a sensor unit, then a signal is transmitted to the central computer to warn of the deactivation, and the sensor unit is deactivated.

Claims

1. A method of monitoring food information in a food service facility, the method comprising the steps of:

providing a central collection apparatus;

providing a plurality of remote sensor units, each remote sensor unit including a temperature sensor and a computer memory device;

installing and initializing each remote sensor unit at a food receptacle; and

after completing the installing and initializing step, operating each remote sensor unit without further user intervention, wherein the step of operating each remote sensor unit includes, at each remote sensor unit;

periodically detecting, via the temperature sensor of the remote sensor unit, food temperature data,

storing the detected data in the computer memory device of the remote sensor unit,

periodically determining whether wireless communication is enabled between the remote sensor unit and the central collection apparatus, and

if wireless communication is enabled between the remote sensor unit and the central collection apparatus, transmitting the data stored in the computer memory device from the remote sensor unit to the central collection apparatus via a wireless communication interface.

2. The method of claim 1, wherein the step of periodically determining whether wireless communication is enabled includes the step of receiving a message having predetermined content from the central collection apparatus.

3. The method of claim 1, wherein the determining step is carried out at each remote sensor unit at least as frequently as the detecting step is carried out at the same remote sensor unit.

4. The method of claim 1, wherein the detecting and determining steps are carried out by each remote sensor unit at a predetermined frequency.

5. The method of claim 4, wherein the predetermined frequency is at least once every ten minutes.

6. The method of claim 1, wherein the step of storing the detected data in the computer memory device is only carried out if it is determined that wireless communication is not enabled.

7. The method of claim 1, further comprising the automatic step, at each remote sensor unit, of recording information about the time that each detecting step is carried out.

8. The method of claim 7, further comprising the automatic step of transmitting, in conjunction with the step of transmitting the stored data, the recorded time information to the central collection apparatus.

9. The method of claim 1, wherein the step of providing a central collection apparatus includes:

installing a central computer system that accumulates first and second temperature data transmitted from the respective remote sensor units; and

installing at least one translator unit within wireless communication range of at least one of the plurality of remote sensor units, each translator unit having a receiver that receives the first and second temperature data from at least one of the plurality of remote sensor units and a transmitter that transmits the first and second temperature data to the central computer system.

10. The method of claim 9, wherein the step of providing a central collection apparatus includes connecting each of the at least one translator unit to the central computer system via a local area network.

11. A method of gathering food information from a variety of locations in a food service facility, the method comprising the steps of:

providing a plurality of uniquely identifiable remote sensor units, each remote sensor unit including a food information sensor and a wireless transceiver;

providing a plurality of interface units, each interface unit including a wireless transceiver;

sensing, via the food information sensor at each remote sensor unit, data representative of a food characteristic;

selecting one of the plurality of remote sensor units;

wirelessly transmitting, via at least one of the interface units, a predetermined signal directed to the selected remote sensor unit; and

upon receiving the predetermined signal at the selected remote sensor unit, wirelessly transmitting the data sensed by the selected remote sensor unit to at least one of the interface units.

12. The method of claim 11, further comprising the step of, upon receiving the predetermined signal at any remote sensor unit other than the selected remote sensor unit, ignoring the predetermined signal.

13. The method of claim 12, further comprising the step of relaying the data from at least one interface unit to a central computer.

14. The method of claim 13, wherein the step of selecting one of the plurality of remote sensor units is carried out by the central computer.

15. The method of claim 13, wherein the steps of selecting, wirelessly transmitting a predetermined signal and wirelessly transmitting the sensed data are carried out for each of the plurality of remote sensor units.

16. The method of claim 15, wherein the steps of selecting, wirelessly transmitting a predetermined signal and wirelessly transmitting the sensed data are repeated periodically for each of the plurality of remote sensor units.

17. The method of claim 13, further comprising the step of maintaining, at the central computer, a list of active remote sensor units, wherein the selecting step includes selecting one of the plurality of remote sensor units from the list of active remote sensor units.

18. The method of claim 12, wherein the step of providing a plurality of remote sensor units includes positioning the remote sensor units in various locations in a food service facility.

19. The method of claim 12, wherein the sensing step includes sensing data representative of a food temperature characteristic.

20. A method of gathering food information, the method comprising the steps of:

installing each of a plurality of remote sensor units in a food service facility;

at each remote sensor unit;

repeatedly gathering data representative of a food characteristic, and

after at least some of the gathering steps, communicating the gathered data from the remote sensor unit to a central computer;

initiating a deactivation request at a selected remote sensor unit;

upon receiving the deactivation request, transmitting a signal from the selected remote sensor unit to the central computer alerting the central computer that the selected remote sensor unit has received a deactivation request; and

after receiving the deactivation request, discontinuing the step of communicating the gathered data from the deactivated remote sensor unit.

21. The method of claim 20, further comprising the step of displaying, at the central computer, the data gathered from each remote sensor unit while the remote sensor unit continues to repeatedly carry out the gathering and communicating steps.

22. The method of claim 21, further comprising the step, after receiving the deactivation request, of discontinuing the step of repeatedly gathering data at the deactivated remote sensor unit.

23. The method of claim 21, wherein the step of transmitting a signal includes transmitting a data packet of a predefined content.

24. The method of claim 21, wherein the remote sensor unit includes a user interface, and wherein the deactivation request is generated in response to input received from a user via the user interface.

25. The method of claim 24, wherein the user interface includes a deactivation push button, and wherein the deactivation request is generated in response to the user pressing the deactivation push button.

26. The method of claim 24, further comprising the step of providing power to each remote sensor unit via a respective battery, wherein the deactivation request is generated in response to an indication that the battery level is nearly depleted.

27. The method of claim 21, further comprising the step of maintaining, at the central computer, a record of the activation status of each of the plurality of remote sensor units.

28. The method of claim 27, further comprising the step of displaying, at the central computer, an indication of the activation status of each of the plurality of remote sensor units.

29. A method of alerting a user to a temperature problem, the method comprising the steps of:

providing a plurality of portable remote sensor units, each remote sensor unit including a food temperature sensor and an input port;

at each remote sensor unit;

detecting data representative of a food temperature characteristic, and

communicating the data to a central computer;

at the central computer, comparing the data received from each remote sensor unit to one or more predetermined temperature limit;

if the data from any of the remote sensor units violates any predetermined temperature limit, communicating a predetermined alarm signal from the central computer to the remote sensor unit that detected the data; and

if any remote sensor unit receives the predetermined alarm signal from the central computer, generating, at the remote sensor unit that receives the signal, a user-perceptible alert signal indicating the existence of a temperature problem.

30. The method of claim 29, wherein the one or more predetermined temperature limits for one remote sensor unit may be established independently from the one or more predetermined temperature limits for the other remote sensor units.

31. The method of claim 29, further comprising the step of acknowledging, to the central computer, the receipt of the predetermined alarm signal at the remote sensor unit that detected the violating data.

32. The method of claim 31, further comprising the step of recording an indication of the time that the acknowledgment was received at the central computer.

33. The method of claim 29, wherein at least one of the one or more predetermined temperature limits is a temperature maximum.

34. The method of claim 29, wherein at least one of the one or more predetermined temperature limits is a temperature minimum.

35. The method of claim 29, wherein the step of comparing the received data to one or more predetermined temperature limit includes comparing the received data to both a temperature maximum and a temperature minimum.