IR Toaster Image-Based Feedback for Consistent Browning Control
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Solution Overview
Problem
Toasters face challenges in consistently toasting bread products with varying densities and initial temperatures, leading to inconsistent surface toasting and potential burning due to the Maillard reaction, which affects flavor, texture, and appearance.
Innovation Solution
Mechanical thermal management components, including heat retention lids and a shutter for the camera aperture, along with a controller that analyzes image data from an external camera to adjust heating element operation, ensuring precise toasting control and speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the heating element operates at high temperature to speed up toasting, then toasting speed is improved, but the risk of burning increases
Solution Approach 1:
The patent employs a camera to capture images of the bread surface during toasting and uses image analysis to detect browning progress. This visual feedback is fed back to the controller, which adjusts heating element operation in real-time. The system transitions from open-loop timing control to closed-loop visual control, allowing high-temperature operation while preventing burns through continuous monitoring and adaptive adjustment.
Solution Approach 2:
The patent replaces traditional mechanical/thermal sensing methods with optical sensing using a camera and image processing algorithms. Instead of using thermocouples or mechanical contact sensors to detect bread temperature and browning, the system uses non-contact optical detection to monitor surface color changes, enabling more precise and responsive control of the heating process.
2Reliability
If the toaster uses high thermal capacity to maintain consistent temperature, then toasting control is improved, but the ability to adapt to varying bread densities decreases
Solution Approach 1:
The visual feedback system allows the controller to observe actual browning progress on each bread surface individually. When processing breads of varying densities, the system can detect differences in browning rates and adjust heating power accordingly for each side, maintaining consistent results despite variations in bread composition. The feedback loop enables real-time compensation for density variations.
Solution Approach 2:
The patent implements dynamic control where heating parameters are continuously adjusted based on real-time image analysis. Rather than using fixed thermal capacity and static timing, the system dynamically modulates heating element power levels in response to observed browning progress, allowing adaptation to different bread densities and compositions while maintaining consistent toasting quality.
3Extent of automation
If the camera is exposed to heat energy from the heating element, then the camera can monitor the toasting process, but the camera functionality and longevity are compromised
Solution Approach 1:
The patent physically separates the camera from the high-temperature toasting chamber environment by positioning it outside through an aperture. The camera monitors the toasting process remotely without being exposed to direct heat energy from the heating element. This spatial extraction protects the camera's electronic components and sensor from thermal damage while maintaining automated monitoring capability.
Solution Approach 2:
The aperture serves as an intermediary structure that allows optical information to pass from the toasting chamber to the camera while blocking thermal energy. The aperture design enables the camera to observe the browning process through transmitted light without exposing the camera body to harmful heat levels, thus protecting camera functionality while enabling automated monitoring.
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
The solution enables consistent toasting of bread products with varying densities and temperatures, improving toasting speed and control by retaining heat and protecting camera functionality, while minimizing burn risk and enhancing flavor development.
Implementation Method 1
A heating element is arranged within the toasting chamber interior of the housing and relative to the rack. The heating element is operable to direct IR energy to the bread product on the rack.
Implementation Method 2
Mechanical thermal management components of the toaster enable the selective management of the heat conditions created in the toaster during operation thereof. The mechanical thermal management components include but are not limited to heat retention lids which may be configured to selectively occlude one or more openings into the toaster.
Implementation Method 3
The mechanical thermal management components may further include a shutter that selectively occludes a camera aperture. The shutter blocks the camera from being exposed to a portion of the heat energy generated by the toaster during operation.
Implementation Method 4
The process of toasting, which is also referred to herein as browning, is the result of a chemical reaction known as the Maillard reaction. The Maillard reaction is the reaction between carbohydrates and proteins that occurs upon heating and which produces browning.
Implementation Method 5
An image capture device is positioned exterior of the housing. The image capture device operates to acquire image data of the bread product on the rack. A controller receives the image data. The controller processor analyzes successive image data received from the image capture device.
Data Source
AI summary
A toaster includes a rack within a toasting chamber. A lid is movable with the rack to selectively occlude an opening to the toasting chamber. A heating element within the toasting chamber is operable to direct IR energy to the bread product on the rack. An image capture device operates to acquire image data of the bread product on the rack. A controller receives the image data. The controller processor analyzes successive image data received from the image capture device. Based upon the analysis of the image data, the controller operates the heating element to achieve a predetermined toasting level of the bread product and then turn off the heating element.