Targeted oven self-clean preheat temperature control
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Solution Overview
Problem
Manufacturing variations in cooking elements can cause cooking appliances with similar construction and control to fail time-temperature curve comparisons, necessitating full testing for certification, even if they are substantially similar to existing certified products.
Innovation Solution
A cooking appliance with a controller that dynamically controls the rate of temperature rise during the preheat phase of the self-clean cycle to reach target temperature setpoints, reducing the impact of manufacturing variations and ensuring consistent time-temperature curves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dynamic temperature control during preheat phase is implemented, then time-temperature curve consistency is improved, but device complexity increases
Solution Approach 1:
The control system dynamically adjusts the power delivered to cooking elements during the preheat phase based on real-time temperature feedback. The controller modifies heating parameters (power level, duration) to compensate for manufacturing variations in cooking elements, ensuring consistent time-temperature curves across different appliances. This dynamic adaptation resolves the contradiction by making the control system flexible enough to handle component variations without requiring overly complex hardware modifications.
Solution Approach 2:
The system employs temperature sensors to continuously monitor oven cavity temperature during the preheat phase and feeds this information back to the controller. The controller uses this feedback to adjust cooking element power in real-time, compensating for variations in element performance. This closed-loop feedback mechanism ensures consistent time-temperature curves while maintaining relatively simple device architecture, resolving the contradiction between reliability and complexity.
2Productivity
If manufacturing variations in cooking elements are accommodated, then productivity is improved through test waivers, but measurement precision deteriorates
Solution Approach 1:
The system changes the control parameters (power, time, temperature setpoints) during the preheat phase to compensate for manufacturing variations in cooking elements. By dynamically adjusting these parameters based on actual temperature measurements and element performance, the system ensures that time-temperature curves remain within acceptable ranges despite component variations. This enables test waivers to be granted while maintaining measurement precision through active parameter adaptation.
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 approach provides a consistent time-temperature curve that is resistant to manufacturing variations, potentially allowing for test waivers and reducing certification testing requirements by ensuring that products similar to existing ones meet regulatory standards.
Implementation Method 1
a temperature sensor configured to sense an air temperature within the oven cavity
Implementation Method 2
one or more electric cooking elements configured to generate heat within the oven cavity
Data Source
AI summary
One or more cooking elements of a cooking appliance may be controlled during the preheat phase of an oven self-clean cycle to dynamically control a rate of temperature rise to reach a target temperature setpoint at a predetermined time in the oven self-clean cycle.