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

Patent metadata

Field	Value
Publication number	US-9395078-B2
Application number	US-201213591692-A
Country	US
Kind code	B2
Filing date	Aug 22, 2012
Priority date	Aug 22, 2012
Publication date	Jul 19, 2016
Grant date	Jul 19, 2016

Abstract

A cooking sensor system that includes a burner assembly; and a vibration sensor assembly configured to generate a vibration signal that corresponds to vibrations of cookware situated on the burner assembly. The cooking sensor system also includes a processor to receive the vibration signal and determine at least one of a boiling condition and a boil-dry condition for a liquid contained within the cookware, wherein the determination is based at least in part on the vibration signal. The cooking sensor system further includes an indicator element coupled to the processor to indicate the at least one of a boiling condition and a boil-dry condition. The cooking sensor system may also include a control element coupled to the processor to operate the burner assembly based at least in part on the at least one of a boiling condition and a boil-dry condition.

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;
a processor arranged to receive the vibration signal and determine each of a boiling condition and a boil-dry condition for a liquid contained within the cookware, wherein the determination is based at least in part on a conversion of the vibration signal into a vibration data set comprising vibration power versus frequency by applying Fast Fourier Transform methodologies, and a comparison of the vibration data set to a predetermined threshold frequency, a predetermined boiling onset threshold vibration power, and a predetermined peak boiling threshold vibration power that correspond to prior-derived data associated with the boiling and boil-dry conditions for the liquid contained within the cookware; and
an indicator element coupled to the processor, wherein the indicator element is arranged to at least one of visually and audibly indicate at least one of the boiling condition and the boil-dry condition.

2. The cooking sensor system according to claim 1 , wherein the vibration sensor assembly comprises at least one sensor from the group consisting of an accelerometer, a tilt sensor, a proximity sensor, a position sensor, and a transducer.

3. The cooking sensor 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. A cooking control 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;
a processor arranged to receive the vibration signal and determine each of a boiling condition and a boil-dry condition for a liquid contained within the cookware, wherein the determination is based at least in part on a conversion of the vibration signal into a vibration data set comprising vibration power versus frequency by applying Fast Fourier Transform methodologies, and a comparison of the vibration data set to a predetermined threshold frequency, a predetermined boiling onset threshold vibration power, and a predetermined peak boiling threshold vibration power that corresponds to prior-derived data associated with the boiling and boil-dry conditions for the liquid contained within the cookware; and
a control element coupled to the processor, wherein the control element is arranged to operate the burner assembly based at least in part on at least one of the boiling condition and the boil-dry condition.

5. The cooking control system according to claim 4 , wherein the vibration sensor assembly comprises at least one sensor from the group consisting of an accelerometer, a tilt sensor, a proximity sensor, a position sensor, and a transducer.

6. The cooking control system according to claim 4 , wherein the determination is based at least in part on the vibration signal and a heat input from the burner assembly.

7. The cooking control system according to claim 4 , wherein the control element is arranged to control the operation of the burner assembly to optimize energy usage based at least in part on at least one of the boiling condition and the boil-dry condition.

8. The cooking control system according to claim 4 , wherein the control element is arranged to de-activate the burner assembly based at least in part on the boil-dry condition.

9. The cooking system according to claim 4 , wherein the control element is arranged to operate the burner assembly to optimize energy usage upon the determination of the boiling condition.

10. The cooking system according to claim 4 , wherein the control element is arranged to deactivate the burner assembly upon the determination of the boil-dry condition.

11. 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;
a processor arranged to receive the vibration signal and determine each of a boiling condition and a boil-dry condition for a liquid contained within the cookware, wherein the determination is based at least in part on a conversion of the vibration signal into a vibration data set comprising vibration power versus frequency by applying Fast Fourier Transform methodologies, and a comparison of the vibration set to a predetermined threshold frequency, a predetermined boiling onset threshold vibration power, and a predetermined peak boiling threshold vibration power that corresponds to prior-derived data associated with the boiling and boil-dry conditions for the liquid contained within the cookware;
a control element coupled to the processor, wherein the control element is arranged to operate the burner assembly based at least in part on at least one of the boiling condition and the boil-dry condition; and
an indicator element coupled to the processor configured to visually and/or audibly indicate at least one of the boiling condition and the boil-dry condition.

Assignees

• Buendia Garcia Ali R
• Ashrafzadeh Farhad
• Mukhtar Moeed
• 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 Primary

  with radial outlets at the burner head · CPC title

• F23N5/242 Primary

  using electronic means · CPC title