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

{
  "publication_number": "US9395078B2",
  "country": "US",
  "kind": "B2",
  "title": "Boil and boil-dry detection systems for cooking appliances using vibration sensors",
  "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.",
  "claims": [
    "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."
  ],
  "description_excerpt": "The disclosure relates to cooking appliances and, more particularly, to cooking sensor systems employing vibration sensors for use in such appliances.\n\nCooking operations involving foods, mixtures, edibles, soups, liquids and other preparations with substantial liquid content often require a boiling step. Depending on the food composition (i.e., solid and liquid components), recipe and various other cooking-related factors, a short or prolonged boiling step may be required. The boiling temperature of the liquid component of a food substance is dependent on atmospheric conditions, the composition of the liquid itself, condition of the cookware, and other factors. Typically, the cooking operations necessary to boil such substances involve manual control and oversight of a heating input, e.g., a gas burner control knob, an electric heating element input, etc. In particular, an operator, through visual and/or auditory indications, detects a boiling condition and controls the heating input, accordingly.\n\nOne aspect of the disclosure is to provide 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 arranged 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.",
  "cpc": [
    "A47J 27/21058",
    "F23D 14/06",
    "F23D 14/72",
    "F23N 2031/00",
    "F23N 2231/00",
    "F23N 5/242"
  ],
  "ipc": [
    "F23D 5/12",
    "F23D 14/06",
    "F23D 14/72",
    "F23N 5/24",
    "F24H 9/20"
  ],
  "assignees": [
    "Whirlpool Corp"
  ],
  "inventors": [
    "Ali R. Buendia Garcia",
    "Farhad Ashrafzadeh",
    "Moeed MUKHTAR"
  ],
  "filing_date": "2012-08-22",
  "publication_date": "2016-07-19",
  "grant_date": "2016-07-19",
  "priority_date": "2012-08-22",
  "application_number": "US-201213591692-A",
  "family_id": "50148274",
  "cited_by_count": 4,
  "citations": [
    "US4869233A",
    "US5096725A",
    "US6118104A",
    "US6433693B1",
    "CN201346120Y",
    "US20120186745A1"
  ]
}