Household Appliance Service Mode Timeout for Safe Reversion
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Solution Overview
Problem
Existing household appliances lack a safe mechanism to automatically exit the service mode if accidentally entered or if a problem is encountered, potentially leading to hazardous situations due to deactivated safety settings.
Innovation Solution
The appliance automatically returns to the operating mode if a selector predefined by the producer is not actuated within a certain time period after entering the service mode, ensuring user safety and allowing controlled service operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the service mode is entered by deactivating safety settings, then the service personnel can perform manual malfunction controls, but the appliance becomes unsafe if accidentally entered or if problems occur during service mode
Solution Approach 1:
The control unit is pre-programmed with a time-based monitoring mechanism that automatically detects when the selector has not been actuated within the predetermined time period, and automatically switches back to operating mode without requiring additional user input or intervention
Solution Approach 2:
The control unit continuously monitors the state of the selector and the elapsed time since service mode activation, using this feedback information to automatically determine when to switch back to operating mode, creating a closed-loop safety mechanism
2Adaptability or versatility
If the service mode requires pressing predetermined keys or entering codes, then the service mode can be activated, but there is no mechanism to automatically return to operating mode if accidentally entered
Solution Approach 1:
The control unit is pre-configured with a time threshold value that defines the maximum duration for which the selector must remain actuated to maintain service mode, and automatically executes the mode switch-back function when this time limit is exceeded
Solution Approach 2:
The appliance performs the safety function of returning to operating mode automatically through its own control unit without requiring external intervention, tools, or additional user actions, making the system self-correcting
3Reliability
If the service personnel must remain near the appliance to prevent problems during service mode, then safety can be maintained, but the service operations are interrupted and productivity decreases
Solution Approach 1:
The control unit autonomously monitors the selector state and elapsed time, and automatically switches back to operating mode when the selector is not actuated within the predetermined time period, eliminating the need for continuous service personnel presence and allowing uninterrupted service operations
Data Source
Figure 1
AI summary
The present invention relates to a household appliance (1) that can be operated in an operating mode or a service mode which comprises a control unit (2) for controlling the operation in the selected mode, and at least one selector (3) that sends a command to the control unit (2) by being actuated.