Sorption Dryer Control Architecture for Dishwasher Thermal Protection
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Solution Overview
Problem
Domestic dishwashers with sorption drying systems face challenges in ensuring secure and reliable operation of the sorption drying device over the product lifetime, particularly in maintaining functional integrity during sorption and desorption processes.
Innovation Solution
An additional control unit is provided to specifically control electrical components of the sorption drying device, allowing for tailored operating parameters and enhanced supervision to ensure secure operation, including thermal protection and fault detection mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an additional control unit is provided for specific control of electrical components of the sorption drying device, then functional security and reliability of the sorption drying device is improved, but device complexity increases
Solution Approach 1:
The control system is segmented into a main control device for overall dishwasher control and an additional control unit specifically dedicated to controlling electrical components of the sorption drying device. This segmentation allows the additional control unit to focus on specific control tasks, improving functional security through specialized supervision while maintaining manageable system complexity through modular architecture.
Solution Approach 2:
The additional control unit acts as an intermediary between the main control device and the electrical components of the sorption drying device (heating device, fan). It receives control signals from the main control device and translates them into specific control actions for the electrical components, providing a layer of dedicated control that enhances reliability without requiring the main control device to directly manage all sorption drying components.
2Volume of stationary object
If the additional control unit is integrated as a component of the main control device, then device space occupation is reduced, but functional independence and fault isolation capability deteriorate
Solution Approach 1:
The control functionality is segmented into the main control device and an additional control unit as separate functional entities. This segmentation enables fault isolation, where failures in the sorption drying device's electrical components or their control logic do not propagate to the main control device, thereby maintaining overall system reliability while occupying minimal additional space through compact integration.
3Reliability
If the additional control unit is spatially separated from the main control device, then functional security through fault isolation is improved, but installation outlay and space requirements increase
Solution Approach 1:
The additional control unit is positioned in close proximity to the sorption drying device's electrical components (heating device, fan) rather than being remotely located. This local positioning minimizes installation complexity and space requirements while still providing adequate fault isolation from the main control device. The close proximity facilitates easier wiring and maintenance while maintaining the functional independence needed for reliability.
4Reliability
If the additional control unit supervises operating parameters of electrical components, then operational security is improved, but control system complexity increases
Solution Approach 1:
The additional control unit implements feedback supervision of operating parameters (temperature, fan operation) of the electrical components in the sorption drying device. By continuously monitoring these parameters and comparing them against safe operating ranges, the control unit can detect anomalies and trigger protective actions, enhancing operational security through intelligent monitoring without requiring complex control algorithms.
Solution Approach 2:
The additional control unit provides self-service monitoring and protection for the electrical components of the sorption drying device. It independently supervises operating parameters and can autonomously initiate protective measures when unsafe conditions are detected, reducing the burden on the main control device and simplifying the overall control architecture while maintaining high operational security.
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
The additional control unit ensures the sorption drying device operates within a safe range, preventing thermal overloads and material damage, thus maintaining functional security and integrity throughout the dishwasher's lifetime.
Implementation Method 1
For regeneration, i.e. desorption, of the reversibly dehydratable sorption drying material of the sorption column for re-use in the dry state
Implementation Method 2
to enable it to be blown by means of an air flow generated by the fan into the washing container
Implementation Method 3
The air heated up by this desorption can be used additionally to warm or to heat a washing liquor, air and/or items to be washed
Data Source
AI summary
A domestic dishwasher is provided, which has a main controller, a sorption drying device, and an additional controller to specifically control an electrical component of the sorption drying device.