Input Means Locking Device for Household Appliance Setting Protection
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Solution Overview
Problem
Household devices, such as refrigeration units, often experience unintentional changes in settings due to user interactions, leading to potential misuse or accidental modifications of device functions.
Innovation Solution
An electronic control device with an input means locking mechanism that automatically locks after a predetermined period of inactivity, preventing unintended changes by requiring a minimum actuation duration for unlocking and providing acoustic or optical signals for user feedback, thus ensuring safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the input means locking device automatically locks after a predetermined period of inactivity, then device settings are protected from unintentional changes, but the ease of operation is reduced due to requiring manual unlocking
Solution Approach 1:
The control element serves dual purposes: it functions as both a regular control input and an unlocking mechanism. When activated for a sufficient duration, it automatically unlocks the input means locking device, eliminating the need for a separate unlocking action and making the system self-serving.
Solution Approach 2:
The system uses time-based periodic action where the control element must be held for a specific duration (minimum actuation duration) to trigger the unlocking function. This temporal distinction allows the system to differentiate between accidental brief touches and intentional unlocking commands.
2Reliability
If the minimum actuation duration is set to prevent accidental unlocking, then the reliability of locking is improved, but the ease of operation deteriorates due to longer required press duration
Solution Approach 1:
The system requires a partial action (holding the control element for a minimum duration) to distinguish intentional unlocking from accidental touches. This excessive action threshold ensures that only deliberate attempts to unlock will succeed, while brief accidental contacts are ignored.
3Ease of operation
If acoustic or optical signals are provided for user feedback, then the ease of operation is improved through clear feedback, but the device complexity increases
Solution Approach 1:
The control element is designed to perform multiple functions: it serves as both the control input for normal operations and as an unlocking mechanism. This multi-functionality reduces the need for separate components and simplifies the overall device structure while maintaining clear user feedback capabilities.
Data Source
AI summary
A household device, in particular a refrigeration device, includes an electronic control device configured to control at least one function of the household device, an input device connected to the control device, having at least one input and being configured to supply an assigned control signal to the control device, based on a manual actuation of the at least one input. An input locking device, in its locked state, is configured to prevent controlling of the function of the household device, despite the at least one input being actuated, and in its unlocked state, is configured to permit controlling of the function of the household device when the at least one input is actuated. The input locking device is configured and/or constructed for shifting the input locking device into the locked state, after the at least one input has not been actuated over a predefined time period.