Dishwasher Door Position Detection for Delayed Cycle Protection
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Solution Overview
Problem
Existing dishwashing appliances may initiate a washing operation without ensuring the door is properly closed, leading to missed washing cycles due to users forgetting to latch the door.
Innovation Solution
A method and system for a dishwashing appliance that includes determining a future-use chamber cycle to be initiated at a delayed time, detecting if the door is unlatched, generating a door-alert signal, and restricting the initiation of the future-use chamber cycle until the door is properly latched.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the appliance initiates washing operation without door position verification, then the washing cycle can start automatically, but the user may miss the washing operation due to forgetting to close the door
Solution Approach 1:
The system performs preliminary door position verification before initiating the washing cycle. The controller checks whether the door is properly closed and latched before allowing the wash operation to commence, preventing missed cycles due to user forgetfulness.
Solution Approach 2:
The system implements feedback by monitoring door position status and providing user notifications. The controller continuously checks door position and alerts the user if the door is not properly closed, ensuring the washing cycle only starts when conditions are appropriate.
2Reliability
If the appliance requires door latching before washing, then the washing operation reliability improves, but the ease of operation deteriorates due to additional user steps
Solution Approach 1:
The system performs self-verification of door position automatically. The controller monitors door position and manages the pre-wash check without requiring explicit user action, making the reliability improvement transparent to the user.
Solution Approach 2:
The system provides automated feedback to guide user action. Rather than requiring users to manually verify door closure, the system monitors and communicates status, reducing the perceived operational burden while maintaining reliability.
3Reliability
If the appliance adds door position detection and alert functions, then the reliability of washing operation improves, but the device complexity increases
Solution Approach 1:
The door position sensor serves multiple functions: it detects door closure status, verifies proper latching, and provides input for the control logic that determines whether to allow wash cycle initiation. This multi-functionality reduces the need for separate dedicated components.
Solution Approach 2:
The door position detection function is integrated with the existing control system. The controller that manages the washing cycle also handles door position verification and user alerting, combining multiple functions into a single control unit rather than adding separate dedicated systems.
Data Source
AI summary
A dishwashing appliance may include a cabinet, a tub, a door, a sensor assembly, and a controller. The tub may be mounted within the cabinet and define a wash chamber for receipt of articles for washing. The door may be movably mounted to the cabinet. The door may be movable between a latched position restricting access to the wash chamber and an unlatched position permitting access to the wash chamber. The sensor assembly may be mounted to the door to detect a position thereof. The controller may be configured to initiate a detection operation. The detection operation may include determining a future-use chamber cycle (FCC) to be initiated at a delayed time period, detecting the door in the unlatched position at the sensor assembly, generating a door-alert signal in response to detecting the door in the unlatched position, and restricting initiation of the FCC following generating the door-alert signal.