Boil and boil-dry detection systems for cooking appliances using vibration sensors

Patent metadata

Field	Value
Publication number	US-9675199-B2
Application number	US-201615207808-A
Country	US
Kind code	B2
Filing date	Jul 12, 2016
Priority date	Aug 22, 2012
Publication date	Jun 13, 2017
Grant date	Jun 13, 2017

Abstract

A method of boil and boil-dry detection for cooking appliances. The method includes the steps: detecting vibrations that correspond to cookware situated on a burner assembly; generating a vibration signal based on the vibrations; and performing signal processing on the vibration signal. The method also includes the steps: collecting vibration data related to the vibration signal; and detecting boiling and boil-dry conditions for a liquid contained within the cookware based at least in part on an evaluation of the vibration data.

First claim

We claim:

1. A cooking sensor system, comprising:
a burner assembly;
a vibration sensor assembly configured to generate a vibration signal that corresponds to vibrations of cookware situated on the burner assembly; and
a processor arranged to receive the vibration signal and determine at least one of a boiling onset condition and a boil-dry condition for a liquid contained within the cookware,
wherein the determination is based at least in part on (a) a conversion of the vibration signal into a vibration data set comprising vibration power versus frequency, and (b) a comparison of the vibration data set to boiling attributes of the liquid, and
further wherein the boiling attributes comprise: (i) a predetermined threshold frequency, (ii) a predetermined boiling onset threshold vibration power, and (iii) a predetermined peak boiling threshold vibration power.

2. The system according to claim 1 , wherein the determination is further based at least in part on (c) a comparison of the vibration data set to other attributes of the sensor system, the other attributes comprising a cookware placement threshold frequency and a burner assembly adjustment threshold frequency.

3. The system according to claim 1 , wherein the determination is based at least in part on the vibration signal and a heat input from the burner assembly.

4. The system according to claim 1 , wherein the conversion of the vibration signal into a vibration data set comprising vibration power versus frequency is based on a Fast Fourier Transform methodology.

5. The system according to claim 1 , further comprising:
an indicator element coupled to the processor configured to visually and/or audibly indicate the at least one of the boiling onset condition and the boil-dry condition.

6. The system according to claim 1 , further comprising:
a control element coupled to the processor, wherein the control element is arranged to operate the burner assembly based at least in part on the at least one of the boiling onset condition and the boil-dry condition.

7. The system according to claim 5 , further comprising:
a control element coupled to the processor, wherein the control element is arranged to operate the burner assembly based at least in part on the at least one of the boiling onset condition and the boil-dry condition.

8. A cooking sensor system, comprising:
a burner assembly;
a vibration sensor assembly configured to generate a vibration signal that corresponds to vibrations of cookware situated on the burner assembly; and
a processor arranged to receive the vibration signal and determine a boil-dry condition for a liquid contained within the cookware,
wherein the determination is based at least in part on (a) a conversion of the vibration signal into a vibration data set comprising vibration power versus frequency, and (b) a comparison of the vibration data set to boiling attributes of the liquid, and
further wherein the boiling attributes comprise: (i) a predetermined threshold frequency, (ii) a predetermined boiling onset threshold vibration power, and (iii) a predetermined peak boiling threshold vibration power.

9. The system according to claim 8 , wherein the determination is further based at least in part on (c) a comparison of the vibration data set to other attributes of the sensor system, the other attributes comprising a cookware placement threshold frequency and a burner assembly adjustment threshold frequency.

10. The system according to claim 8 , wherein the determination is based at least in part on the vibration signal and a heat input from the burner assembly.

11. The system according to claim 8 , wherein the conversion of the vibration signal into a vibration data set comprising vibration power versus frequency is based on a Fast Fourier Transform methodology.

12. The system according to claim 8 , further comprising:
an indicator element coupled to the processor configured to visually and/or audibly indicate the boil-dry condition.

13. The system according to claim 8 , further comprising:
a control element coupled to the processor, wherein the control element is arranged to operate the burner assembly based at least in part on the boil-dry condition.

14. The system according to claim 12 , further comprising:
a control element coupled to the processor, wherein the control element is arranged to operate the burner assembly based at least in part on the boil-dry condition.

15. A cooking sensor system, comprising:
a burner assembly;
a vibration sensor assembly configured to generate a vibration signal that corresponds to vibrations of cookware situated on the burner assembly; and
a processor arranged to receive the vibration signal and determine a boiling onset condition for a liquid contained within the cookware,
wherein the determination is based at least in part on (a) a conversion of the vibration signal into a vibration data set comprising vibration power versus frequency, and (b) a comparison of the vibration data set to boiling attributes of the liquid, and
further wherein the boiling attributes comprise: (i) a predetermined threshold frequency, (ii) a predetermined boiling onset threshold vibration power, and (iii) a predetermined peak boiling threshold vibration power.

16. The system according to claim 15 , wherein the determination is further based at least in part on (c) a comparison of the vibration data set to other attributes of the sensor system, the other attributes comprising a cookware placement threshold frequency and a burner assembly adjustment threshold frequency.

17. The system according to claim 15 , wherein the determination is based at least in part on the vibration signal and a heat input from the burner assembly.

18. The system according to claim 15 , wherein the conversion of the vibration signal into a vibration data set comprising vibration power versus frequency is based on a Fast Fourier Transform methodology.

19. The system according to claim 15 , further comprising:
an indicator element coupled to the processor configured to visually and/or audibly indicate the boiling onset condition.

20. The system according to claim 15 , further comprising:
a control element coupled to the processor, wherein the control element is arranged to operate the burner assembly based at least in part on the boiling onset condition.

Assignees

• Whirlpool Co

Inventors

• Buendia Garcia Ali R
• Ashrafzadeh Farhad
• Mukhtar Moeed

Classifications

• F23N2231/00

  Fail safe · CPC title

• A47J27/21058 Primary

  Control devices to avoid overheating, i.e. "dry" boiling, or to detect boiling of the water (A47J27/21158 takes precedence) · CPC title

• F23D14/72

  Safety devices, e.g. operative in case of failure of gas supply · CPC title

• F23D14/06

  with radial outlets at the burner head · CPC title

• F23N5/242 Primary

  using electronic means · CPC title