Oven Broiler Temperature Control Using Dual-Threshold Heating Cycles
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Solution Overview
Problem
Conventional oven appliances face challenges in accurately delivering high-intensity heat for broiling due to discrepancies between temperature measurements at sensors and actual cooking chamber temperatures, leading to inadequate or lengthy cooking operations.
Innovation Solution
An oven appliance with a controller that initiates and manages the activation of a top heating element based on initial and predetermined temperature thresholds, reducing heat output when a certain temperature is reached and reactivating it according to a maximum threshold, ensuring consistent and accurate heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the broiler heating assembly is activated to achieve a set temperature in the cooking chamber, then the cooking chamber temperature increases, but the temperature sensor readings become inaccurate due to indirect measurement and thermal lag
Solution Approach 1:
The patent introduces an intermediary algorithm that translates indirect temperature sensor readings into accurate representations of the cooking chamber temperature. The controller applies thermal models and correction factors to compensate for the sensor's position and thermal lag, effectively mediating between the sensor's limited capabilities and the need for precise temperature control.
Solution Approach 2:
The system implements continuous feedback by monitoring temperature sensor readings and dynamically adjusting the broiler heating assembly activation. The controller uses real-time temperature data to modulate heating cycles, ensuring the cooking chamber reaches and maintains the desired temperature while compensating for measurement inaccuracies through iterative correction.
2Productivity
If the broiler heating assembly is activated for extended periods to perform multiple cooking cycles, then productivity increases, but the correlation between sensor temperature and actual cooking chamber temperature becomes disrupted
Solution Approach 1:
The patent applies preliminary thermal modeling and pre-calculated correction factors that account for extended heating scenarios. Before multiple cooking cycles begin, the system establishes baseline thermal characteristics and prepares compensation algorithms that remain valid throughout extended operation, preventing correlation disruption before it occurs.
Solution Approach 2:
The temperature compensation algorithm dynamically adapts to changing thermal conditions during extended cooking operations. The controller continuously updates correction factors based on observed thermal behavior patterns, allowing the system to maintain accurate temperature correlation even as thermal mass and heat distribution change over multiple cooking cycles.
3Adaptability or versatility
If the temperature sensor is positioned away from the cooking chamber center, then the heating element can be positioned flexibly, but the temperature measurement becomes indirect and less accurate
Solution Approach 1:
The patent uses an intermediary computational model that translates temperature readings from the sensor's off-center position into accurate representations of the cooking chamber center temperature. The thermal model acts as a mediator, accounting for heat distribution patterns and spatial relationships to provide accurate temperature control despite the sensor's flexible positioning.
4Speed
If the top heating element is activated at high power to deliver intense heat quickly, then cooking speed increases, but other portions of the cooking chamber become excessively heated
Solution Approach 1:
The patent implements periodic heating cycles where the top heating element operates at high power for specific durations followed by controlled rest periods. This pulsed activation pattern delivers intense heat quickly when needed while allowing heat distribution to equalize during off-periods, preventing excessive heating of areas not requiring direct radiant heat.
Solution Approach 2:
The heating element's power output is dynamically adjusted based on real-time temperature feedback from multiple sensors. The controller modulates power delivery continuously, increasing power when the target area needs heat and reducing power when surrounding areas approach temperature thresholds, enabling fast heating without harmful overheating.
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 ensures consistent and accurate heating of the cooking chamber, preventing overcooking or overheating, and maintaining extended heat generation without excessively heating other portions of the oven.
Implementation Method 1
Multiple gas or electric heating elements are positioned within the cabinet for heating the cooking chamber to cook food items located therein
Implementation Method 2
The oven temperature sensor may be disposed within the cabinet to detect a temperature within the cooking chamber
Data Source
AI summary
An oven appliance may include a cabinet, a plurality of chamber walls, a top heating element, an oven temperature sensor, and a controller. The plurality of chamber walls may define a cooking chamber. The oven temperature sensor may be disposed within the cabinet to detect a temperature within the cooking chamber. The controller may be configured to initiate a cooking operation that includes directing initial activation of the top heating element according to an initial offset temperature threshold, detecting a first temperature value at the oven temperature sensor that is greater than the initial offset temperature threshold, reducing heat output at the top heating element in response to detecting the first temperature value, and directing, following reducing heat output, reactivation of the top heating element according to a predetermined maximum threshold at the oven temperature sensor, the predetermined maximum threshold being distinct from the initial offset threshold.