Household dishwasher machine and method for operating a household dishwasher machine
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Solution Overview
Problem
Household dishwashers often fail to completely dry dishes after a cycle, leading to restrictions on immediate placement and potential recondensation, despite existing methods like rinse aid, zeolite drying units, and moisture sensors.
Innovation Solution
A household dishwasher equipped with an optical sensor, such as an infrared sensor, and an evaluation unit that determines the drying state of dishes based on detected temperature and relative humidity, allowing for triggered actions to enhance drying or notify the user when dishes are ready to be removed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional drying methods (rinse aid, zeolite drying units, condensation drying) are used, then some drying effect is achieved, but dishes are not completely dry and moisture may recondense
Solution Approach 1:
The patent employs an optical sensor to continuously monitor the drying status of dishes and provides feedback to the control device. Based on this feedback, the control device adjusts drying parameters or extends the drying phase to ensure complete dryness and prevent recondensation, resolving the contradiction between achieving drying effectiveness and preventing moisture return.
Solution Approach 2:
The system performs preliminary detection of dish drying status during the wash cycle using optical sensors. By detecting moisture levels in advance, the system can extend the drying phase or adjust parameters before the cycle ends, ensuring dishes are completely dry and preventing recondensation during cooling or door opening.
2Ease of operation
If dishes are removed immediately after washing, then user convenience is improved, but dishes are wet and require hand drying or rack arrangement
Solution Approach 1:
The control device receives continuous feedback from optical sensors about dish drying status and notifies the user when dishes are completely dry. This allows users to remove dishes immediately at the optimal moment without wetness, combining convenience with complete drying without requiring extended wait times or manual drying.
3Measurement precision
If an optical sensor is added to detect drying status, then drying monitoring is improved, but device complexity increases
Solution Approach 1:
The patent uses an optical sensor as an intermediary to indirectly detect dish drying status by measuring properties of the air or dish surfaces. This intermediary approach provides precise measurement without requiring direct contact with dishes, maintaining measurement precision while keeping the system relatively simple through non-invasive optical detection.
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
Enables precise determination of dish drying state, facilitating quicker drying, preventing recondensation, and informing users when dishes are ready for removal, thus improving user convenience and efficiency.
Implementation Method 1
The optical sensor is designed as an infrared sensor configured to detect the temperature of the items and the relative humidity of the air in the wash chamber
Implementation Method 2
an optical sensor for detecting an optical sensor signal from the items arranged in the wash chamber
Data Source
Figure 1
Figure 2~3
AI summary
The invention relates to a household dishwasher machine (1) comprising a control device (100) for running a washing program selected from a number of washing programs for washing items to be washed (15) arranged in a washing compartment (4), an optical sensor (110) for detecting an optical sensor signal of the items to be washed (15) arranged in the washing compartment (4), and an evaluation unit (120) designed to determine a dry state of the items to be washed (15) arranged in the washing compartment (4) according to the detected optical sensor signal of the washing compartment (4).