Cooking Appliance Gain Scheduling for Sudden Temperature Drops
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Solution Overview
Problem
Existing cooking appliances face poor temperature control performance during early stages of heating due to controller gain values that are not optimized for sudden temperature changes, such as when food is added to the cookware.
Innovation Solution
A cooking appliance that utilizes multiple sets of controller gain values, including a first set for initial temperature stabilization and a second set for rapid response to sudden changes, through a trigger-based scheduling mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single set of controller gain values is used for feedback controlled heating, then the controller structure remains simple, but temperature control precision deteriorates during sudden temperature changes
Solution Approach 1:
The patent implements dynamic switching between multiple sets of controller gain values based on real-time temperature change rates. The controller monitors the rate of temperature change and automatically selects appropriate gain values from different sets, transitioning from static to dynamic control parameters. This resolves the contradiction by making the controller adaptive to changing conditions while maintaining a relatively simple overall structure through algorithmic switching rather than hardware complexity.
Solution Approach 2:
The patent changes the controller gain parameters dynamically by selecting from multiple pre-defined sets of gain values. Each set is optimized for different operating conditions (e.g., different temperature ranges or heating stages). By changing parameters based on detected trigger events such as food addition, the system achieves high precision temperature control without requiring a completely complex controller architecture.
2Speed
If controller gain values are optimized for rapid response to sudden temperature changes, then responsiveness improves, but temperature control stability deteriorates during early heating stages
Solution Approach 1:
The patent segments the heating process into different stages or conditions, each with its own optimized set of controller gain values. One set is optimized for rapid response during sudden temperature changes (e.g., when food is added), while another set is optimized for stability during early heating stages. The controller switches between these segmented parameter sets based on detected trigger events, thereby achieving both rapid responsiveness and temperature stability in different operating phases.
Solution Approach 2:
The controller dynamically adapts its gain values based on the current heating stage and detected temperature change patterns. During early heating stages, the controller uses gain values optimized for stability. When a trigger event is detected indicating sudden temperature change, the controller switches to gain values optimized for rapid response. This dynamic parameter adjustment resolves the contradiction between responsiveness and stability.
3Adaptability or versatility
If a single set of controller gain values is used throughout the heating process, then the control algorithm remains simple, but temperature control adaptability deteriorates when cooking conditions change
Solution Approach 1:
The controller implements dynamic adaptation by monitoring cooking conditions and automatically switching between multiple sets of gain values. When conditions change (e.g., food added to cookware, temperature reaches certain thresholds), the controller detects trigger events and switches to appropriately optimized parameter sets. This provides high adaptability to different cooking scenarios while keeping the control algorithm relatively simple through rule-based switching rather than complex adaptive algorithms.
Solution Approach 2:
The system uses feedback from temperature sensors to detect trigger events and determine when to switch between different gain value sets. The feedback mechanism monitors temperature changes and cooking progress, and automatically adjusts the controller parameters accordingly. This feedback-driven parameter switching enhances adaptability to changing cooking conditions while maintaining algorithmic simplicity through event-triggered switching.
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
Enhances temperature control precision and responsiveness, allowing for quicker temperature attainment and better handling of sudden temperature fluctuations during cooking.
Implementation Method 1
A cooking appliance generally includes one or more heating elements configured for heating a cookware item
Implementation Method 2
a temperature sensor configured to selectively monitor a temperature of the cookware item
Implementation Method 3
A cooking appliance and method of operating a cooking appliance which obviates one or more of the above-mentioned drawbacks would be beneficial. In particular, a cooking appliance capable of utilizing multiple sets of controller gain values during a cooking operation would be useful
Data Source
AI summary
A method of operating a cooking appliance including at least one heating element and a temperature sensor includes determining a temperature setpoint; retrieving a first set of controller gain values for a feedback controlled heating operation, the first set of controller gain values including a first derivative gain value; directing the at least one heating element according to the first set of controller gain values; detecting a trigger event while directing the at least one heating element according to the first set of controller gain values; retrieving a second set of controller gain values in response to detecting the trigger event, the second set of controller gain values including a second derivative gain value; and directing the at least one heating element according to the second set of controller gain values.