Adaptive Elevator Door Dwell Time Control
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Solution Overview
Problem
Conventional elevator systems employ a fixed door dwell time, which can lead to unnecessary waiting for passengers, as it defaults to a longer time to accommodate handicapped passengers, and does not adjust based on the actual load weight, affecting service quality.
Innovation Solution
An adaptive method that adjusts the elevator door dwell time by comparing a predefined load weight value to a sensed load weight value, allowing for adjustments such as decreasing or increasing the dwell time based on the difference, using a load weight sensor and controller to optimize door operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed long door dwell time is used to accommodate handicapped passengers, then accessibility for handicapped passengers is improved, but waiting time for other passengers increases unnecessarily
Solution Approach 1:
The door dwell time is made dynamic rather than fixed. The controller adjusts the door dwell time based on real-time load weight detection, allowing the system to adapt between short dwell times for light loads and long dwell times for heavy loads or handicapped passengers, thus resolving the contradiction between accessibility and waiting time
Solution Approach 2:
The door dwell time parameter is changed based on load weight conditions. When the load weight exceeds a threshold (indicating possible handicapped passengers or heavy cargo), the dwell time is extended; otherwise, it is reduced, optimizing both accessibility and service efficiency
2Device complexity
If a fixed door dwell time is used, then system simplicity is maintained, but service quality and efficiency deteriorate due to unnecessary waiting
Solution Approach 1:
A feedback mechanism is introduced where the load weight sensor continuously monitors the elevator car load and provides information to the controller. The controller uses this feedback to dynamically adjust the door dwell time, improving service quality without significantly increasing system complexity
Solution Approach 2:
The system automatically adjusts door dwell time based on load weight detection without requiring manual intervention. The controller self-regulates the door operation parameters based on sensor data, maintaining simplicity while enhancing productivity
Data Source
AI summary
A method of controlling an elevator door dwell time includes obtaining a predefined load weight value; obtaining a load weight value from a load weight sensor coupled to an elevator car; comparing the load weight value to the predefined load weight value to generate a difference; and adjusting the elevator door dwell time in response to the difference to define an adjusted elevator door dwell time.