Oven Cooking Surface Preheat Control Using Segmented Heating Elements
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Solution Overview
Problem
Conventional oven appliances face challenges in preheating high-heat cooking surfaces efficiently, leading to uneven temperatures and prolonged heating times, which can affect cooking performance, especially for foods requiring localized high heat.
Innovation Solution
An oven appliance with a controller that manages a top and bottom heating element, using sensors to initiate preheat and maintain specific temperatures by activating and deactivating these elements based on temperature thresholds, ensuring a consistent cooking surface and oven temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If bottom heat only is used to preheat the cooking surface, then the cooking surface can be heated, but the temperature distribution becomes uneven with areas near the bottom heater being hotter than those further away
Solution Approach 1:
The heating system is segmented into multiple independent heating zones (front, center, rear) along the cooking surface. Each zone can be controlled separately to achieve uniform temperature distribution across the entire cooking surface, preventing the localized overheating that occurs with a single bottom heater.
Solution Approach 2:
Different regions of the cooking surface are provided with dedicated heating elements positioned to deliver heat locally to specific areas. This ensures that each zone reaches the desired temperature uniformly, with front, center, and rear sections independently controlled to maintain overall temperature consistency.
2Manufacturing precision
If traditional oven preheat methods alternate bottom and top heat, then even heating of the oven is achieved, but a long period of time is required to bring the cooking surface to ready-to-cook temperature
Solution Approach 1:
The cooking surface is preheated in advance using dedicated bottom heating elements positioned directly beneath the cooking surface. This preliminary heating action occurs simultaneously with or before the oven chamber heating, so that when cooking begins, the cooking surface is already at the required temperature, eliminating the time delay associated with traditional alternating preheat methods.
Solution Approach 2:
The bottom heating elements operate continuously during the preheat cycle without interruption or alternation with top heating elements. This continuous application of heat to the cooking surface ensures rapid and consistent temperature rise, maintaining useful heating action throughout the preheat period rather than alternating between heating zones.
3Temperature
If bottom heating element is used to preheat the cooking surface, then the cooking surface temperature can be increased, but the oven chamber remains unpreheated which reduces cooking performance
Solution Approach 1:
The heating system is designed with multi-functionality where bottom heating elements serve dual purposes: heating the cooking surface directly and contributing to overall oven chamber preheating. The top heating elements simultaneously heat the oven chamber and assist in creating uniform temperature distribution, ensuring both the cooking surface and oven environment are properly prepared for cooking.
Solution Approach 2:
The preheating functions for the cooking surface and the oven chamber are merged into a single coordinated operation. Multiple heating elements (front, center, rear bottom heaters and top heaters) operate together in a unified preheat sequence, so that both the cooking surface and oven chamber reach their target temperatures simultaneously, ensuring optimal cooking performance from the start.
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 rapid and even preheating of the cooking surface and oven chamber, maintaining precise temperatures throughout the cooking cycle, enhancing cooking performance and reducing heating time.
Implementation Method 1
The bottom heating element may be mounted below the cooking surface to heat the cooking surface
Implementation Method 2
heat from the bake heating assembly is thus forced to rise through an air gap
Implementation Method 3
heat from the bake heating assembly is thus forced to rise through an air gap
Implementation Method 4
The top heating element may be mounted above the cooking surface to heat the cooking chamber
Implementation Method 5
The cooking surface temperature sensor may be disposed in proximity to the cooking surface. The oven temperature sensor may be disposed within the cabinet
Data Source
AI summary
An oven appliance may include a cabinet, a plurality of chamber walls, a cooking surface, a top heating element, a temperature sensor, and a controller. The cooking surface may be defined in a cooking chamber. The top heating element may be mounted above the cooking surface to heat the cooking chamber. The temperature sensor may be disposed within the cabinet. The controller may be configured to initiate a cooking operation that includes initiating preheat activation of the top heating element, receiving temperature signals from the temperature sensor during the preheat activation, determining a preheat threshold is met based on the received temperature signals, and initiating cooking activation of the top heating element based on a cooking cycle having a predetermined time interval subsequent to determining the preheat threshold is met. Initiating cooking activation may include directing the top heating element based on the cooking cycle for the predetermined time interval.