Electric Oven Broiling Control for Closed-Door Operation
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Solution Overview
Problem
Electric ovens typically require the door to be open during broiling to prevent overcooking, limiting cooking options and efficiency, as the door needs to be closed for certain cooking methods to maintain temperature and prevent heat loss.
Innovation Solution
The electric oven is equipped with a control unit that monitors the door position and temperature, allowing for both open-door and closed-door broil operations by activating and deactivating the broiling element based on predefined shutoff temperatures and user-selected power modes, including cycling between power levels to optimize cooking conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the oven door is opened during broiling, then the foodstuffs are prevented from being overcooked, but heat loss increases and cooking efficiency decreases
Solution Approach 1:
The patent implements dynamic door position detection and adaptive broiling control. The control unit continuously monitors door position and adjusts broiling element operation accordingly, switching between open-door and closed-door broiling modes. This dynamic adaptation allows the system to optimize between preventing overcooking (when door is open) and reducing heat loss (when door is closed), resolving the contradiction through real-time condition-based control.
2Loss of energy
If the oven door is closed during broiling, then heat loss is reduced and energy efficiency improves, but the risk of overcooking increases
Solution Approach 1:
The patent employs feedback control by continuously monitoring door position and temperature, then adjusting broiling element operation accordingly. When the door is closed, the control unit detects this condition and modifies broiling parameters to prevent overcooking while maintaining energy efficiency. This closed-loop feedback system resolves the contradiction by using real-time information to balance heat retention with food safety.
3Productivity
If the broiling element is operated continuously at high power, then cooking speed increases, but energy consumption and risk of overheating increase
Solution Approach 1:
The patent implements periodic cycling of the broiling element operation. Instead of continuous high-power operation, the control unit cycles the broiling element on and off based on temperature feedback and door position. This periodic action maintains cooking speed by ensuring the element operates at full power when needed, while reducing overall energy consumption through strategic off-periods, particularly when the door is closed and heat retention is high.
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 enables efficient broiling operations with the door open or closed, maintaining desired temperatures and power levels, enhancing cooking flexibility and energy efficiency while preventing overcooking.
Implementation Method 1
An electric broiling element positioned proximate to an upper surface of the cooking chamber
Implementation Method 2
A temperature sensor positioned to determine the temperature within the cooking chamber
Data Source
AI summary
An electric oven broils foodstuffs with either its oven door opened or closed. The operating parameters of the oven's broiling elements are altered based on the position of the door.