Toaster Thickness Detection for Adaptive Heating Program Control
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Solution Overview
Problem
Conventional toasters fail to achieve optimal heating results for certain food categories, such as toast, as short programs result in underheated interiors while longer programs lead to burnt exteriors due to insufficient heat penetration.
Innovation Solution
Incorporating a detection device to recognize food thickness and generate a corresponding signal, which activates a control unit to execute a heating program with alternating activations and deactivations of the heating elements, ensuring even heating without burning the outer surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a long heating program is selected, then the inside of the toast is heated appropriately, but the outer surfaces will get too hot or may even burn
Solution Approach 1:
The heating element operates in periodic cycles with multiple activation phases separated by deactivation intervals. During activation phases, heat is applied to brown the outer surface; during deactivation intervals, heat allows the inner layers to cook through conduction without additional external heating, preventing burning while ensuring thorough internal heating.
Solution Approach 2:
The initial activation phase applies heat to the outer surface first to establish browning, then subsequent cycles provide controlled heating intervals that allow heat to penetrate inward. This preliminary action on the outer surface creates a thermal gradient that protects against burning during extended heating periods.
2Adaptability or versatility
If manual program selection is required, then the user can choose based on food type, but the toaster cannot automatically optimize heating for different food thicknesses
Solution Approach 1:
The toaster automatically detects food thickness using a sensor that measures the position of the food item, then autonomously selects and executes the appropriate heating program from multiple predefined options. This eliminates the need for manual program selection by the user while providing optimized heating parameters tailored to the specific food thickness detected.
Solution Approach 2:
The thickness detection sensor provides feedback about the food item's dimensions to the control system, which then automatically adjusts the heating program selection and parameters. This closed-loop feedback mechanism enables the toaster to adapt its operation to match the actual food characteristics without user input.
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 solution allows for optimal heat transfer to both outer surfaces and inner layers of the food, improving the quality of the toasted product by autonomously selecting the appropriate heating program based on food thickness, thus enhancing user satisfaction.
Implementation Method 1
the heat can be allowed to reach also the innermost layers of the food
Implementation Method 2
heating elements... consisting of electric resistors that, when run by electric current, transfer heat to the foods
Implementation Method 3
detection device configured for recognising said at least one thickness as a function of a displacement of said at least one positioning structure
Data Source
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AI summary
A toaster comprising: at least one heating compartment (11, 12), in which the food to be heated (13, 14) is positioned; at least one heating element (21-24), associated with said at least one heating compartment (11, 12) and adapted to heat the food (13, 14) positioned in said at least one heating compartment (11, 12); at least one detection device (70, 80) for recognising a thickness of said at least one food (13, 14) and generating a corresponding detection signal (DS1, DS2); a control unit (30), acting upon said at least one heating element (21-24) and configured for executing a heating program as a function of said detection signal (DS1, DS2).