Elevator Bypass Control for Peak Load Transport
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Solution Overview
Problem
In high-rise buildings, undisciplined input of destination calls in elevator systems leads to fully loaded elevator cars stopping at unnecessary floors, causing increased transport times and reduced capacity, especially during peak hours when many passengers travel to the ground floor simultaneously.
Innovation Solution
The method activates a bypass function when the elevator load exceeds capacity, allowing fully laden cars to travel directly to the ground floor or main stop without stopping at booked floors, shifting unfulfilled destination calls to subsequent circuits and ensuring all passengers are transported before normal operation resumes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If the destination call control allocates elevator cars based on booked destination calls, then the control system operates automatically and efficiently, but undisciplined input by passengers causes fully loaded elevator cars to stop at unnecessary floors, increasing transport time and reducing transport capacity
Solution Approach 1:
The system continuously monitors the instantaneous load of the elevator car using a load measuring device and compares it with the full load parameter. This feedback mechanism enables the control system to detect when the elevator is fully loaded and activate the bypass function accordingly, resolving the contradiction between automatic control and transport capacity maintenance
Solution Approach 2:
The control system dynamically switches between normal operation mode and bypass function based on real-time load conditions. When the elevator exceeds full load capacity, the system automatically transitions to bypass mode, preventing stops at intermediate floors and maintaining optimal transport capacity during peak demand periods
2Ease of operation
If the elevator car stops at every floor with a booked destination call, then all booked passengers can potentially board, but the elevator car becomes fully loaded early and cannot accommodate additional passengers, leading to increased waiting times
Solution Approach 1:
The system determines the instantaneous load at a fixable point in time before the elevator completes its circuit, allowing it to predict when full load will be reached. This preliminary assessment enables proactive activation of the bypass function, ensuring that the elevator maintains availability for additional passengers while minimizing waiting times
3Productivity
If the bypass function is activated to maintain transport capacity, then transport time is optimized and capacity is maximized, but the system complexity increases with additional control mechanisms
Solution Approach 1:
The load measuring device automatically provides load information to the control system, and the control system autonomously decides when to activate the bypass function based on pre-defined full load parameters. This self-service approach minimizes the need for additional complex control mechanisms while maintaining optimized transport capacity
Data Source
AI summary
A method of controlling an elevator installation having an elevator car transporting passengers between floors of a building inputs destinations of the passengers into a destination call control and books destination calls and determines an instantaneous load disposed in the elevator car with a load measuring device at a fixable point in time. In order to make uniform the waiting times of the passengers in the case of incorrect operation of the destination call control and to ensure, for all passengers, an optimized transport time with maximum transport capacity the method additionally compares the instantaneous load with a full load parameter and in the case of exceeding of the full load parameter activating a bypass function those floors for which destination calls are booked and which are passed during a half circuit of the fully loaded elevator car.