Dual-Heat Gas Oven Baking Control for Even Browning
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Solution Overview
Problem
Gas oven cooking algorithms face inconsistent performance due to variable input voltages affecting the time for the oven igniter to reach ignition temperature, leading to uneven cooking and poor browning results.
Innovation Solution
A gas cooking appliance with both a lower and upper heat source, where the upper heat source is cycled for a predetermined time and the lower heat source is activated based on temperature, ensuring consistent heating above and below food items, reducing susceptibility to voltage fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single lower heat source is used for baking, then the device complexity is reduced, but the cooking uniformity deteriorates because the bottom of items gets seared while the top remains unbrowned
Solution Approach 1:
The single heat source is segmented into two separate heat sources: an upper heat source and a lower heat source. This segmentation allows independent control of heating zones to achieve uniform browning on both top and bottom surfaces of baked items, resolving the cooking uniformity issue without requiring excessive complexity.
Solution Approach 2:
The heating arrangement transitions from a one-dimensional lower-only configuration to a two-dimensional configuration with both upper and lower heat sources. This dimensional change enables simultaneous heating from multiple directions, improving cooking uniformity while maintaining reasonable device complexity.
2Device complexity
If the oven igniter is connected in series with the gas valve circuit, then the device complexity is reduced, but the reliability deteriorates because voltage fluctuations cause variable ignition times that disrupt timed cooking cycles
Solution Approach 1:
The control system monitors the actual ignition time and uses this feedback information to adjust subsequent cooking cycle timings. This feedback mechanism compensates for voltage-induced ignition time variations, maintaining reliable and consistent cooking performance despite electrical fluctuations.
Solution Approach 2:
The system pre-calculates and stores multiple ignition time compensation values that are applied based on measured ignition delays. This preliminary preparation of compensation data allows rapid correction of timing errors without complex real-time calculations, maintaining reliability while managing circuit complexity.
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 ensures even browning of both top and bottom surfaces of food items, improving cooking consistency and performance across varying input voltages by maintaining a stable oven cavity temperature.
Implementation Method 1
As power flows through the oven igniter, the igniter heats up. When the oven igniter reaches a predetermined ignition temperature, the oven gas valve will open, allowing gas to flow from the burner. The glowing hot oven igniter will ignite the gas flow.
Implementation Method 2
an upper heat source disposed adjacent the top surface of the gas oven cavity... providing heat above and below the food item during baking
Implementation Method 3
cycling the upper heat source and the lower heat source for providing heat above and below the food item
Data Source
AI summary
A gas cooking appliance includes a gas oven cavity for cooking a food item, the gas oven cavity including a top surface and a bottom surface, a lower heat source disposed adjacent the bottom surface of the gas oven cavity, an upper heat source disposed adjacent the top surface of the gas oven cavity, and a controller configured to cycle the upper heat source and the lower heat source for providing heat above and below the food item during cooking, wherein a cycle of the upper heat source is time-dependent, and a cycle of the lower heat source is temperature-dependent.