Adjusting a preheating cycle according to thermal attributes of cookware items
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Solution Overview
Problem
Cooking appliances face issues with undesirable heating behaviors, such as excessive temperature overshoots and long heat rise times, due to the use of single feedback control algorithms that fail to account for the varying thermal properties of cookware items.
Innovation Solution
A cooking appliance with a feedback controlled heating operation that includes a thermal coupling classification period to determine the thermal behavior of cookware items, allowing for adjustments to the power level and duration of the preheating phase based on the thermal coupling behavior, optimizing heat transfer and retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single feedback control algorithm is used to control heating, then the control system is simple, but it results in excessive temperature overshoots and long heat rise times due to varying thermal properties of cookware
Solution Approach 1:
The system dynamically adapts the feedback control parameters based on detected thermal coupling behavior. The controller switches between different feedback control algorithms or adjusts algorithm parameters according to the cookware's thermal properties, transforming a static single-algorithm system into a dynamic multi-algorithm system that adapts to different cookware types.
Solution Approach 2:
The system changes control parameters (such as proportional gain, integral gain, derivative gain) based on the detected thermal coupling behavior. By adjusting these parameters according to the cookware's thermal properties, the system optimizes temperature control precision without requiring complete system redesign.
2Device complexity
If a single feedback control algorithm is used for all cookware, then the control algorithm is simple, but it causes undesirable heating behaviors including excessive temperature overshoots
Solution Approach 1:
The system dynamically selects or adjusts feedback control algorithms based on real-time detection of thermal coupling behavior. This dynamic adaptation ensures reliable heating operations across different cookware types while maintaining reasonable algorithm complexity through automated selection rather than manual configuration.
Solution Approach 2:
The system uses feedback from temperature sensors to detect thermal coupling behavior and automatically adjusts the control algorithm accordingly. This closed-loop feedback mechanism improves heating reliability by continuously monitoring and adapting to the actual thermal conditions.
3Ease of operation
If a single feedback control algorithm is used, then the system is easy to operate, but it results in long heat rise times
Solution Approach 1:
The system dynamically optimizes heating parameters based on detected thermal coupling behavior, automatically adjusting power levels and control strategies to minimize preheating time. This dynamic optimization achieves fast heating without requiring user intervention or complex manual adjustments.
Solution Approach 2:
The system performs preliminary detection of thermal coupling behavior during an initial classification period before full heating begins. This preliminary action allows the system to pre-configure optimal control parameters, enabling faster and more efficient heating from the start of the cooking process.
4Device complexity
If a single feedback control algorithm is used, then the control system is simple, but it leads to unsatisfactory cookware item heat at the conclusion of preheating
Solution Approach 1:
The system dynamically adapts control parameters based on detected thermal coupling behavior to achieve uniform temperature distribution. By adjusting control strategies in real-time according to the specific cookware's thermal properties, the system ensures satisfactory heating results without requiring complex manual tuning.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach ensures more efficient and precise preheating by adjusting parameters based on the thermal behavior of cookware items, reducing temperature overshoots and heat rise times, resulting in improved cookware item heat uniformity and reduced preheating times.
Implementation Method 1
Some cooking appliances incorporate a preheating phase to provide heat to the cookware item before performing the cooking operation
Implementation Method 2
A controller may selectively energize the heating element(s) to provide thermal energy to the cookware item during the preheating phase
Implementation Method 3
a temperature sensor configured to selectively monitor a temperature of the cookware item
Implementation Method 4
A controller operably connected with the at least one heating element and the temperature sensor, the controller configured to perform a feedback controlled heating operation
Data Source
AI summary
A method of operating a cooking appliance includes receiving a temperature setpoint input for a preheating phase of a cooking operation; retrieving a default power level for at least one heating element in response to receiving the temperature setpoint input; directing the at least one heating element at the default power level over a thermal coupling classification period, the thermal coupling classification period being a portion of the preheating phase; determining a thermal coupling behavior of a cookware item provided on the at least one heating element after an expiration of the thermal coupling classification period; and adjusting one or more parameters of the preheating phase based on the thermal coupling behavior of the cookware item.