Dual-Sensor Cooking Probe for Lid-Aware Heat Control
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Solution Overview
Problem
Cooking appliances lack effective methods to monitor and control the presence of a lid on cooking utensils, leading to undesirable temperature gradients and suboptimal cooking results.
Innovation Solution
A cooking appliance with a temperature probe having both a fluid temperature sensor and an air temperature sensor, which determines the presence of a cover by comparing actual and predicted air temperatures, allowing for responsive adjustments in heating element power to maintain precise cooking conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single fluid temperature sensor is used, then the device complexity is reduced, but the temperature monitoring precision is insufficient to detect air temperature variations caused by lid presence
Solution Approach 1:
The temperature monitoring function is segmented into two separate sensors: a fluid temperature sensor for monitoring liquid temperature and an air temperature sensor for monitoring air temperature above the fluid. This segmentation enables precise detection of temperature differences that indicate lid presence, resolving the contradiction between measurement precision and device complexity by dividing the monitoring task into specialized sub-functions.
Solution Approach 2:
The dual-sensor probe serves multiple functions: it monitors both fluid and air temperatures simultaneously, enabling the system to detect lid presence through air temperature variations while continuing to monitor cooking temperature. This multi-functionality approach improves measurement precision without proportionally increasing device complexity, as a single probe structure houses both sensors.
2Adaptability or versatility
If lid presence monitoring is added, then cooking process control is improved, but the device complexity increases due to additional sensors and control logic
Solution Approach 1:
The system implements feedback control by continuously comparing the measured air temperature with the measured fluid temperature. When the air temperature is significantly lower than the fluid temperature, the system infers lid presence and adjusts cooking parameters accordingly. This feedback mechanism provides adaptive cooking control without requiring complex direct lid detection hardware.
Solution Approach 2:
The air temperature acts as an intermediary indicator of lid presence. Instead of directly detecting whether a lid is on the pot, the system uses the air temperature above the fluid as a mediator that reflects the thermal environment created by lid presence. This indirect detection method improves cooking process control while avoiding the complexity of direct lid sensors or cameras.
3Measurement precision
If air temperature monitoring is implemented, then lid presence detection accuracy is improved, but energy consumption increases due to continuous dual-temperature monitoring
Solution Approach 1:
The system employs periodic sampling of air and fluid temperatures rather than continuous monitoring. By taking temperature readings at intervals and comparing them to detect lid presence, the system achieves accurate detection while reducing energy consumption associated with continuous sensor operation and data processing.
Solution Approach 2:
The system changes the monitoring parameters dynamically: it compares air temperature and fluid temperature differences to determine lid presence, and adjusts the frequency or threshold of monitoring based on cooking stage and detected conditions. This parameter adaptation allows accurate lid detection while optimizing energy consumption by avoiding unnecessary continuous high-precision monitoring throughout the entire cooking process.
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
Ensures accurate monitoring of both fluid and air temperatures, enabling precise control of cooking processes and improving cooking efficiency by adjusting heating element power based on the presence of a lid.
Implementation Method 1
a first temperature sensor positioned within a fluid contained within the utensil for sensing a temperature of the fluid
Implementation Method 2
a second temperature sensor spaced apart from the first temperature sensor above the fluid for sensing a temperature of the air above the fluid
Implementation Method 3
A cooking appliance may include a heating element, a probe in operative communication with the heating element
Implementation Method 4
a probe holder configured to attach the probe to a cooking utensil
Data Source
AI summary
A method of operating a cooking appliance includes obtaining a set fluid temperature for a fluid within a cooking utensil, monitoring an actual fluid temperature via a first temperature sensor of a probe, determining a predicted air temperature above the fluid, monitoring an actual air temperature above the fluid via a second temperature sensor of the probe, comparing the actual air temperature to the predicted air temperature, and implementing a responsive action based on the comparison between the actual air temperature and the predicted air temperature.