Laundry Dryer Moisture Detection to Prevent Empty-Chamber Energy Waste
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Solution Overview
Problem
Laundry drying machines lack efficient methods to detect empty or dried chambers during early phases of a drying program, leading to unnecessary energy consumption and potential damage to laundry due to incomplete or excessive treatment.
Innovation Solution
A method for controlling laundry drying machines that uses a moisture sensor to compare signals with predefined thresholds, allowing for partial program execution, skipping of energy-intensive phases, or stopping the program when the chamber is determined to be empty or containing dried laundry, thereby optimizing energy use and preventing over-drying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complete laundry treating program is executed regardless of chamber conditions, then the machine ensures thorough drying treatment, but energy consumption increases and laundry may suffer unnecessary stress or damage
Solution Approach 1:
The moisture sensor performs preliminary detection of chamber conditions (empty or dried state) at the beginning of the treatment program before the main drying phase commences. This preliminary action enables the control unit to identify when laundry is already dry or the chamber is empty, allowing the system to skip unnecessary energy-consuming drying phases while ensuring adequate treatment when needed.
Solution Approach 2:
The system continuously monitors moisture levels during the drying program through the moisture sensor and provides feedback to the control unit. Based on this feedback, the control unit can dynamically adjust the treatment program, terminating or skipping phases when drying objectives are already met, thereby reducing energy consumption while maintaining reliable drying performance.
2Reliability
If a complete laundry treating program is executed regardless of chamber conditions, then the machine ensures thorough drying treatment, but treatment time increases
Solution Approach 1:
The moisture sensor performs preliminary detection of chamber conditions at the start of the program to identify already-dry laundry or empty chambers. This preliminary check enables the system to skip unnecessary treatment phases, significantly reducing drying program duration while ensuring complete treatment is delivered when actually needed.
Solution Approach 2:
Continuous moisture monitoring provides real-time feedback during the drying program, enabling the control unit to detect when drying objectives are achieved and terminate or skip remaining phases, thereby reducing overall treatment time while maintaining reliable drying completeness.
3Productivity
If the machine operates without detecting empty or dried conditions, then the program runs completely, but unnecessary stress or damage occurs on laundry due to useless treatments
Solution Approach 1:
The moisture sensor performs preliminary detection at the beginning of the program to identify already-dry laundry or empty chambers before the main drying phase starts. This preliminary action prevents unnecessary mechanical stress from prolonged drum rotation and thermal stress from excessive heating on already-dry laundry, while ensuring complete program execution when laundry actually requires drying.
Solution Approach 2:
Real-time moisture monitoring provides feedback during the drying program, enabling the control unit to terminate treatment when drying objectives are achieved. This feedback mechanism prevents harmful over-drying effects such as excessive mechanical stress from continued tumbling and thermal damage from prolonged high-temperature exposure, while maintaining productive program execution when needed.
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 reduces energy consumption, saves time, and prevents unnecessary stress on laundry by accurately detecting chamber conditions, allowing for tailored treatment phases and notifications to users.
Implementation Method 1
a moisture sensor which provides a signal indicative of the moisture of the laundry
Data Source
AI summary
A method for controlling a laundry drying machine having a laundry treating chamber and a control unit which receives a signal indicative of laundry moisture from a moisture sensor. The method includes receiving a user input of a laundry treating program, and, in the machine initialization phase, comparing the laundry moisture indicated by the signal to a first threshold, which is stored in the control unit and is indicative of dried laundry or empty threating chamber. If the signal is determined to be equal or less than the first threshold, one or more of the following actions is performed: carrying out only a portion of the selected laundry treating program; skipping the program main phase; starting the program final phase; stopping the laundry treating program; providing a notification of dried laundry and/or empty treating chamber.