Infrared Load Sensing in Clothes Dryers for Accurate Cycle Control
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Solution Overview
Problem
Clothes dryers often struggle to accurately determine laundry load size, leading to inefficient energy use and varying drying times, as existing methods rely on user input or simplistic automatic detection.
Innovation Solution
A method using an infrared temperature sensor to take multiple temperature readings over time, calculating temperature variation and delay time to estimate load size, allowing for precise control of operating parameters such as drum speed, temperature, and air flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If user manually inputs laundry load size, then the dryer can adjust operating parameters, but the measurement precision is low and user convenience is reduced
Solution Approach 1:
The dryer automatically determines laundry load size using an infrared sensor to detect temperature variations during drum rotation, eliminating the need for manual user input. The system self-adjusts operating parameters based on the detected load size, improving both measurement precision and user convenience.
Solution Approach 2:
The patent replaces manual mechanical input methods with an infrared optical sensing system. The infrared sensor detects thermal radiation from the laundry load, converting thermal energy to electrical signals for automated load size determination, thereby eliminating manual operation while maintaining high precision.
2Ease of operation
If simple automatic detection methods are used, then ease of operation is improved, but measurement precision of laundry load size deteriorates
Solution Approach 1:
The system continuously monitors temperature variations during drum rotation and uses this feedback to calculate the laundry load size. The infrared sensor takes multiple temperature readings, and the controller processes these readings to determine the load size, providing accurate automatic detection that maintains both ease of operation and measurement precision.
Solution Approach 2:
The patent measures temperature variations as the drum rotates, utilizing the changing thermal parameters detected by the infrared sensor. By analyzing how temperature changes with drum rotation and delay time, the system accurately determines load size without requiring complex mechanical detection systems.
3Productivity
If fixed operating parameters are used regardless of load size, then device complexity is reduced, but productivity and energy efficiency deteriorate
Solution Approach 1:
The system dynamically adjusts operating parameters such as drum speed, temperature, and air flow based on the detected laundry load size. The controller modifies these parameters in real-time during the drying cycle, optimizing productivity and energy efficiency while using a relatively simple infrared sensing mechanism.
Solution Approach 2:
The patent changes operating parameters (drum speed, temperature, air flow) based on the load size determined by the infrared sensor. This parameter adaptation allows the system to maintain high productivity and energy efficiency across different load sizes without requiring a complex control system, as the adjustment logic is based on simple temperature variation measurements.
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 accurate load size determination, optimizing energy use and cycle duration by adjusting operating parameters based on temperature and delay time analysis, resulting in improved drying performance and user convenience.
Implementation Method 1
an infrared temperature sensor directed toward the drying chamber
Data Source
AI summary
A method for controlling the operation of a clothes dryer by determining a load size estimation based on at least one of a temperature variation of the laundry load and a delay time wherein the delay time is a time it takes for the temperature variation to satisfy a predetermined threshold.