Dryer appliance load detection
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Solution Overview
Problem
Conventional dryer appliances rely on standardized termination criteria for cycle completion, which are not always accurate across different loads and machines, leading to inefficiencies due to varying load sizes and installation conditions.
Innovation Solution
A method and system for a dryer appliance that tracks energy output to determine a load score, allowing for a customized termination criterion for drying operations, ensuring accurate cycle completion based on the load size and type.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If standardized termination criteria are used for dryer cycle completion, then the control system is simple and easy to implement, but the accuracy of cycle completion detection deteriorates across different loads and machines
Solution Approach 1:
The system performs preliminary action by detecting load characteristics (weight, volume, density) before the drying cycle begins. This advance detection allows the controller to pre-calculate customized termination criteria specific to each load, thereby resolving the contradiction by enabling accurate detection without requiring complex real-time adjustments during operation.
Solution Approach 2:
The system applies parameter changes by dynamically adjusting termination criteria based on detected load parameters. Instead of using fixed standardized criteria, the controller modifies termination parameters (time, temperature, humidity thresholds) according to the specific load characteristics, achieving high accuracy while maintaining relatively simple control logic through parameter adaptation.
2Measurement precision
If customized termination criteria are determined based on load characteristics, then the accuracy of cycle completion detection is improved, but the device complexity increases
Solution Approach 1:
The system applies self-service by enabling the dryer to automatically detect its own load characteristics and autonomously determine appropriate termination criteria without external intervention. The controller uses built-in sensors and algorithms to perform load assessment and criterion customization, reducing the need for complex external control systems while achieving high detection accuracy.
Solution Approach 2:
The system implements feedback by continuously monitoring drying progress and comparing actual conditions against customized termination criteria. The controller adjusts operation based on feedback from sensors measuring temperature, humidity, and energy consumption, enabling accurate cycle completion detection through iterative refinement while maintaining manageable system complexity through closed-loop control.
3Productivity
If energy output is tracked to determine load score, then the drying process efficiency is improved, but the use of energy increases
Solution Approach 1:
The system applies continuity of useful action by tracking energy output throughout the entire drying cycle rather than performing separate detection operations. The controller continuously monitors energy consumption as part of the normal drying process, using this data to determine load characteristics and optimize drying parameters in real-time, thereby improving efficiency without adding separate energy-intensive detection steps.
Solution Approach 2:
The system uses energy output tracking as an intermediary measure to infer load characteristics indirectly. Rather than using additional sensors that would consume extra energy, the controller uses energy consumption patterns during initial heating phases as a proxy for determining load weight and composition, achieving efficient load detection while minimizing additional energy usage.
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 enables more precise control over drying cycles, improving efficiency and accuracy by tailoring the drying process to specific loads, reducing energy consumption and ensuring optimal dryness levels.
Implementation Method 1
heated air flows from the heating system to the chamber of the drum for drying of articles within the chamber
Data Source
AI summary
A method of operating a dryer appliance includes activating a heating system of the dryer appliance and tracking an energy output of the heating system. The method also includes determining a load score of a load of articles to be dried in the dryer appliance based on the tracked energy output and determining a termination criterion for a dry operation of the dryer appliance based on the load score. The method further includes performing the dry operation in the dryer appliance and terminating the dry operation when the determined termination criterion is reached.