Induction Cooktop Event Detection for Precise Temperature Control
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Solution Overview
Problem
Existing cooking systems, particularly induction cooktops, face challenges in accurately monitoring food temperature and doneness due to sudden temperature changes caused by operations like food addition or flipping, which can be influenced by food type and sensor positioning.
Innovation Solution
A method using a closed-loop controller in an induction cooktop with embedded or external sensors to maintain constant cooking temperature by adjusting power based on the time derivative of temperature and power absorption, detecting food insertion and manipulation through abrupt variations exceeding predetermined thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If temperature sensors are used to monitor food temperature in real-time, then cooking precision is improved, but the system becomes sensitive to abrupt temperature changes caused by food insertion or flipping operations
Solution Approach 1:
The system dynamically adjusts the interpretation of temperature changes based on the cooking phase. During heating phase, temperature drops are expected and acceptable. During maintenance phase, temperature drops below threshold trigger power adjustment. This dynamic adaptation resolves the contradiction by making the monitoring system intelligent rather than static.
Solution Approach 2:
The system changes the threshold parameter for temperature monitoring based on the current cooking phase. Two different thresholds are used: one for heating phase and another for maintenance phase. This parameter change allows the system to tolerate temperature variations during food manipulation while maintaining precision during stable cooking.
2Stability of the object's composition
If the induction cooktop increases heating power to maintain constant temperature, then temperature stability is improved, but power consumption increases during food manipulation operations
Solution Approach 1:
The system dynamically adjusts power consumption based on cooking phase and temperature deviation magnitude. During heating phase, high power is used to reach target temperature. During maintenance phase, power is adjusted only when temperature drops below threshold, rather than continuously. This dynamic approach maintains stability while reducing unnecessary energy consumption.
Solution Approach 2:
The system uses feedback from temperature sensors to adjust power delivery. The controller continuously monitors temperature and compares it against phase-specific thresholds, adjusting power only when deviation exceeds acceptable limits. This feedback mechanism ensures temperature stability while avoiding excessive power consumption during normal operations.
3Device complexity
If simple temperature threshold monitoring is used, then system complexity is reduced, but the ability to detect actual cooking events (food insertion, flipping) is worsened
Solution Approach 1:
The system uses dynamic threshold adjustment based on cooking phase to detect events. During heating phase, larger temperature drops are expected and tolerated. During maintenance phase, even small drops indicate events like food insertion or flipping. This dynamic approach enables event detection without complex algorithms, maintaining low system complexity.
Solution Approach 2:
The cooking process is segmented into distinct phases (heating and maintenance), each with its own temperature threshold criteria. This segmentation allows the simple threshold-based system to effectively detect different types of events by comparing temperature changes against phase-appropriate thresholds, avoiding the need for complex detection algorithms.
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
Enables reliable monitoring of cooking operations by generating event signals for food insertion and flipping, ensuring adherence to a chosen recipe by maintaining temperature within a narrow range, thus facilitating precise cooking control.
Implementation Method 1
an induction cooktop... operated so as to keep constant the cooking temperature
Implementation Method 2
heating power provided by the induction cooktop
Implementation Method 3
sensors coupled to the item of cookware
Data Source
Figure 1
Figure 2
Figure 3a~3d
AI summary
Operations such as adding food or flipping food in an item of cookware being heated may be detected by comparing with a threshold the time derivative of a sensed temperature and/or of heating power absorbed by an item of cookware, wherein the heating power is provided by an induction cooktop operated in order to keep constant the temperature value sensed by the sensors coupled to the item of cookware.