DETERMINING COOKWARE LOCATION ON A COOKTOP APPLIANCE BASED ON RESPONSE TO AN ELECTROMAGNETIC PULSE
A cooktop appliance includes first and second heating elements and a controller operably connected to the first and second heating elements. The controller is configured for receiving a signal from a temperature sensor associated with a cooking utensil. The controller is also configured for generating an electromagnetic pulse with the first heating element for a testing period, and monitoring a voltage or a current associated with the temperature sensor during the testing period. The controller is configured for determining that the cooking utensil is located on the first heating element when the voltage or current associated with the temperature sensor displays electromagnetic interference from the electromagnetic pulse.
The present subject matter relates generally to cooktop appliances, or more particularly to methods for operating cooktop appliances.
BACKGROUNDCooktop appliances generally include heating elements for heating cooking utensils, such as pots, pans and griddles. A user can select a desired heating level, and operation of the heating elements is modified to match the desired heating level. For example, certain cooktop appliances include electric heating elements. During operation, such a cooktop appliance operates the electric heating elements at a predetermined power output corresponding to a selected heating level.
Operating the heating elements at the predetermined power output corresponding to the selected heating level poses certain challenges. For example, the predetermined power output is only an indirect measurement of the actual cooking temperature. Some cooktop appliances employ a temperature sensor to directly measure the temperature of a cooking utensil and/or articles contained within the cooking utensil. The measured temperature may then be used to adjust the power output above or below the predetermined level in order to achieve a cooking temperature closer to the selected heating level.
However, in some instances the cooking utensil with the temperature sensor may be misplaced. For example, the cooking utensil with the temperature sensor may be located on a heating element other than the heating element which is adjusted based on the measured temperature. Further, the cooking utensil with the temperature sensor may be a first cooking utensil and a second cooking utensil may be located on the heating element which is adjusted based on the measured temperature of the first cooking utensil. In such cases, the articles in the first cooking utensil may not be heated as desired and the power output of the heating element which is adjusted based on the measured temperature may be adjusted to a level that is unsuitable for the second cooking utensil and/or articles therein, which can degrade the cooking performance of the cooktop appliance.
Accordingly, a cooktop appliance with features for avoiding such degraded cooking performance would be useful. In particular, a cooktop appliance with features for determining or verifying that a cooking utensil with a temperature sensor corresponds to or is correctly located on the heating element of the cooktop appliance which is controlled based on measurements from the temperature sensor would be particularly beneficial.
BRIEF DESCRIPTION OF THE INVENTIONAspects and advantages of the invention will be set forth in part in the following description, or may be apparent from the description, or may be learned through practice of the invention.
In an exemplary aspect of the present disclosure, a cooktop appliance is provided. The cooktop appliance includes first heating element and a second heating element. The first and second heating elements are positioned at a cooktop surface of the cooktop appliance. The cooktop appliance also includes a controller operably connected to the first and second heating elements. The controller is configured for receiving a signal from a temperature sensor associated with a cooking utensil located on one of the first heating element and the second heating element. The signal is indicative of a temperature associated with the cooking utensil. The controller is also configured for generating an electromagnetic pulse with the first heating element for a testing period and monitoring a voltage or a current associated with the temperature sensor during the testing period. The controller is further configured for determining that the cooking utensil is located on the first heating element when the voltage or current associated with the temperature sensor displays electromagnetic interference from the electromagnetic pulse.
In another exemplary aspect, a method of operating a cooktop appliance is provided. The cooktop appliance has a first heating element and a second heating element positioned at a cooking surface of the cooktop appliance. The cooktop appliance is in operative communication with a temperature sensor associated with a cooking utensil located on one of the first heating element and the second heating element. The method includes generating an electromagnetic pulse with the first heating element for a testing period and monitoring a voltage or a current associated with the temperature sensor during the testing period. The method further includes determining that the cooking utensil is located on the first heating element when the voltage or current associated with the temperature sensor displays electromagnetic interference from the electromagnetic pulse.
These and other features, aspects and advantages of the present invention will become better understood with reference to the following description and appended claims. The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.
A full and enabling disclosure of the present invention, including the best mode thereof, directed to one of ordinary skill in the art, is set forth in the specification, which makes reference to the appended figures.
Reference now will be made in detail to embodiments of the invention, one or more examples of which are illustrated in the drawings. Each example is provided by way of explanation of the invention, not limitation of the invention. In fact, it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the scope or spirit of the invention. For instance, features illustrated or described as part of one embodiment can be used with another embodiment to yield a still further embodiment. Thus, it is intended that the present invention covers such modifications and variations as come within the scope of the appended claims and their equivalents.
As used herein, terms of approximation, such as “generally,” or “about” include values within ten percent greater or less than the stated value. When used in the context of an angle or direction, such terms include within ten degrees greater or less than the stated angle or direction, e.g., “generally vertical” includes forming an angle of up to ten degrees in any direction, e.g., clockwise or counterclockwise, with the vertical direction V.
A cooking surface 14 of cooktop appliance 12 includes a plurality of heating elements 16. The heating elements 16 are generally positioned at, e.g., on or proximate to, the cooking surface 14. In certain exemplary embodiments, cooktop 12 may be an induction cooktop with induction heating elements mounted below cooking surface 14. For the embodiment depicted, the cooktop 12 includes five heating elements 16 spaced along cooking surface 14. However, in other embodiments, the cooktop appliance 12 may include any other suitable shape, configuration, and/or number of heating elements 16. Each of the heating elements 16 may be the same type of heating element 16, or cooktop appliance 12 may include a combination of different types of heating elements 16. For example, in various embodiments, the cooktop appliance 12 may include any other suitable type of heating element 16 in addition to the induction heating element, such as a resistive heating element or gas burners, etc.
As shown in
As will be discussed in greater detail below, the cooktop appliance 12 includes a control system 50 (
Referring now to
In some example embodiments, the cookware temperature sensor 28 may be in contact with, attached to, or integrated into the cooking utensil 18 and configured to sense a temperature of, e.g., a bottom surface of the cooking utensil 18 or bottom wall of the cooking utensil 18. For example, the cookware temperature sensor 28 may be embedded within the bottom wall of the cooking utensil 18 as illustrated in
Additionally, the food temperature sensor 30 may be positioned at any suitable location to sense a temperature of one or more food items 32 (see
In certain exemplary embodiments, one or both of the cookware temperature sensor 28 and the food temperature sensor 30 may utilize any suitable technology for sensing/determining a temperature of the cooking utensil 18 and/or food items 32 positioned in the cooking utensil 18. The cookware temperature sensor 28 and the food temperature sensor 30 may measure a respective temperature by contact and/or non-contact methods. For example, one or both of the cookware temperature sensor 28 and the food temperature sensor 30 may utilize one or more thermocouples, thermistors, optical temperature sensors, infrared temperature sensors, resistance temperature detectors (RTD), etc. The specific structure and function of such sensors are well understood by those of skill in the art, as such, the sensors are not described or shown in further detail for the sake of clarity and concision.
Referring again to
As stated, the cooktop appliance 12 includes a receiver 34 associated with one or more of the heating elements 16, for example a plurality of receivers 34 each associated with a respective heating element 16. For the embodiment depicted, each receiver 34 is positioned directly below a center portion of a respective heating element 16. Moreover, for the embodiment depicted, each receiver 34 is configured as a wireless receiver 34 configured to receive one or more wireless signals. Specifically, for the exemplary control system 50 depicted, both of the cookware temperature sensor 28 and the food temperature sensor 30 are configured as wireless sensors in wireless communication with the wireless receiver 34 via a wireless communications network 54. In certain exemplary embodiments, the wireless communications network 54 may be a wireless sensor network (such as a Bluetooth communication network), a wireless local area network (WLAN), a point-to point communication networks (such as radio frequency identification (RFID) networks, near field communications networks, etc.), a combination of two or more of the above communications networks, or any suitable wireless communications network or networks.
Referring still to
Referring still to
Further, the controller 52 is operably connected to each of the plurality of heating elements 16 for controlling a power level of each of the plurality of heating elements 16 in response to one or more user inputs through the user interface 62 (e.g., control panel 22 and controls 24). Specifically, for the embodiment depicted, wherein one or more of the heating elements 16 are configured as induction heating elements, the controller 52 is operably connected to a plurality of current control devices 64, each current control device 64 associated with a respective one of the induction heating elements 16.
Turning now to
In some embodiments, the controller 52 may be configured to receive a signal from a temperature sensor associated with first cooking utensil 18A located on one of the first heating element 16A and the second heating element 16B, e.g., via the receiver 34 as described above. The signal may be indicative of a temperature associated with the first cooking utensil 18A. For example, the temperature sensor may be associated with the cooking utensil 18A in that the temperature sensor is positioned and configured to sense a temperature of the cooking utensil 18A itself, such as the cookware temperature sensor 28, and/or a temperature of the contents of the cooking utensil, such as the food temperature sensor 30. In order to confirm that the first cooking utensil 18A is located on the first heating element 16A, the controller 52 may further be configured to determine the location of the first cooking utensil 18A based on electromagnetic interference detected via the temperature sensor(s) 28 and/or 30.
For example, in some embodiments, method 200 may include a step 204 of and/or the controller 52 may be configured for generating an electromagnetic pulse for a testing period. In some embodiments, the electromagnetic pulse may be generated by activating the first heating element 16A, e.g., by supplying a current to the coil 15 (
In various embodiments, the second heating element 16B may be deactivated or activated at a low heating level during the testing period. In such embodiments, the location of the first cooking utensil 18A can be determined or confirmed with a minimal or no interruption in the desired cooking operation because of the instantaneous response of electromagnetic fields from the electromagnetic pulse.
The method 200 may further include a step 206 of monitoring a voltage or a current associated with the temperature sensor during the testing period. For example, voltage or current values associated with the temperature sensor(s) 28 and/or 30 may be continuously measured over the testing period. Thus, it should be understood that “monitored,” “monitoring,” or other cognates thereof as used herein include continuous or repeated measuring or sampling of data, e.g., voltage or current, over a period of time. In at least some embodiments, whether the voltage or the current is monitored may depend on what type of sensor is used. For example, in some embodiments, the temperature sensor 28 and/or 30 may be a thermocouple and the controller 52 may be configured for monitoring a voltage across the thermocouple during the testing period. As another example, in some embodiments, the temperature sensor 28 and/or 30 may be one of a thermistor or a resistance temperature detector, and the controller 52 may be configured for monitoring a current through the temperature sensor during the testing period.
The method 200 may also include, at step 208, determining whether the temperature sensor displays or exhibits electromagnetic interference from the electromagnetic pulse, e.g., whether the monitored voltage or current is greater than a predefined threshold. If so, it may be determined that the cooking utensil is located on the correct intended heating element, e.g., the first heating element 16A. For example, in some embodiments where the voltage across the temperature sensor is monitored, the displayed electromagnetic interference may include a peak-to-peak voltage greater than a predetermined threshold. In such embodiments, the displayed electromagnetic interference may also or instead include a maximum voltage or a minimum voltage greater than a predetermined threshold. As another example, in some embodiments where the current through the temperature sensor is monitored, the displayed electromagnetic interference may include a current greater than a predetermined threshold.
Once it has been determined that the first cooking utensil 18A and the associated temperature sensor(s) 28 and/or 30 are located on the first heating element 16A, the method 200 may include a step 210 of adjusting a heating level of the first heating element 16A based on the received signal from the temperature sensor. For example, the controller 52 may then operate the first heating element 16A in response to the measured temperature, e.g., by adjusting a heating level of the first heating element 16A based on the received signal from the temperature sensor(s) 28 and/or 30. For example, adjusting the heating level may include supplying a variable power level to the first heating element 16A based on the measured temperature, e.g., using a closed control loop such as a PI or PID control. For example, as is generally understood in the art, the measured temperature may be input into a closed control loop and the operation of the first heating element 16A, e.g., the heating level, may be adjusted based on the output of the closed control loop.
In some embodiments, when the electromagnetic interference is not detected, e.g., before the testing period elapses, the method 200 may further include a step 212 of and/or the controller 52 may further be configured for deactivating the first heating element 16A. In such cases, a notification such as an error message or alert, e.g., via user interface 62, may also be provided when the electromagnetic interference is not detected.
As mentioned above, the displayed electromagnetic interference may include a current greater than a predetermined threshold. For example,
As mentioned above, the displayed electromagnetic interference may include a peak-to-peak voltage greater than a predetermined threshold and/or a maximum voltage or a minimum voltage greater than a predetermined threshold. For example,
This written description uses examples to disclose the invention, including the best mode, and also to enable any person skilled in the art to practice the invention, including making and using any devices or systems and performing any incorporated methods. The patentable scope of the invention is defined by the claims, and may include other examples that occur to those skilled in the art. Such other examples are intended to be within the scope of the claims if they include structural elements that do not differ from the literal language of the claims, or if they include equivalent structural elements with insubstantial differences from the literal languages of the claims.
Claims
1. A cooktop appliance, comprising:
- a first heating element and a second heating element, the first and second heating elements positioned at a cooktop surface of the cooktop appliance; and
- a controller operably connected to the first and second heating elements, the controller configured for: receiving a signal from a temperature sensor associated with a cooking utensil located on one of the first heating element and the second heating element, the signal indicative of a temperature associated with the cooking utensil; generating an electromagnetic pulse with the first heating element for a testing period; monitoring a voltage or a current associated with the temperature sensor during the testing period; and determining that the cooking utensil is located on the first heating element when the voltage or current associated with the temperature sensor displays electromagnetic interference from the electromagnetic pulse.
2. The cooktop appliance of claim 1, wherein the temperature sensor comprises a thermocouple and the controller is configured for monitoring a voltage across the thermocouple during the testing period.
3. The cooktop appliance of claim 1, wherein the temperature sensor comprises one of a thermistor or a resistance temperature detector and the controller is configured for monitoring a voltage across or a current through the temperature sensor during the testing period.
4. The cooktop appliance of claim 1, wherein the electromagnetic interference comprises a peak-to-peak voltage greater than a predetermined threshold.
5. The cooktop appliance of claim 1, wherein the electromagnetic interference comprises a current greater than a predetermined threshold.
6. The cooktop appliance of claim 1, wherein the electromagnetic interference comprises one of a maximum voltage and a minimum voltage greater than a predetermined threshold.
7. The cooktop appliance of claim 1, wherein the controller is further configured for deactivating the first heating element and providing a notification when the voltage or current of the conductor does not display electromagnetic interference from the electromagnetic pulse.
8. The cooktop appliance of claim 1, wherein generating the electromagnetic pulse comprises activating the first heating element for a predetermined period of time.
9. The cooktop appliance of claim 1, wherein generating the electromagnetic pulse comprises activating the first heating element for a first predetermined period of time and deactivating the first heating element for a second predetermined period of time following the first predetermined period of time.
10. The cooktop appliance of claim 1, wherein the controller is further configured for adjusting a heating level of the first heating element based on the received signal from the temperature sensor after determining that the cooking utensil is located on the first heating element.
11. A method of operating a cooktop appliance having a first heating element and a second heating element positioned at a cooking surface of the cooktop appliance, the cooktop appliance in operative communication with a temperature sensor associated with a cooking utensil located on one of the first heating element and the second heating element, the method comprising:
- generating an electromagnetic pulse with the first heating element for a testing period;
- monitoring a voltage or a current associated with the temperature sensor during the testing period; and
- determining that the cooking utensil is located on the first heating element when the voltage or current associated with the temperature sensor displays electromagnetic interference from the electromagnetic pulse.
12. The method of claim 11, wherein the temperature sensor comprises a thermocouple and the step of monitoring comprises monitoring a voltage across the thermocouple during the testing period.
13. The method of claim 11, wherein the temperature sensor comprises one of a thermistor or a resistance temperature detector and the step of monitoring comprises monitoring a current through the temperature sensor during the testing period.
14. The method of claim 11, wherein the electromagnetic interference comprises a peak-to-peak voltage greater than a predetermined threshold.
15. The method of claim 11, wherein the electromagnetic interference comprises a current greater than a predetermined threshold.
16. The method of claim 11, wherein the electromagnetic interference comprises one of a maximum voltage and a minimum voltage greater than a predetermined threshold.
17. The method of claim 11, further comprising deactivating the first heating element and providing a notification when the voltage or current of the conductor does not display electromagnetic interference from the electromagnetic pulse.
18. The method of claim 11, wherein generating the electromagnetic pulse comprises activating the first heating element for a predetermined period of time.
19. The method of claim 11, wherein generating the electromagnetic pulse comprises activating the first heating element for a first predetermined period of time and deactivating the first heating element for a second predetermined period of time following the first predetermined period of time.
20. The method of claim 11, further comprising adjusting a heating level of the first heating element based on a received signal from the temperature sensor, the signal indicative of a temperature associated with the cooking utensil, after determining that the cooking utensil is located on the first heating element.
Type: Application
Filed: Jul 13, 2018
Publication Date: Jan 16, 2020
Inventor: Michael Blum (Louisville, KY)
Application Number: 16/034,418