Destination-Based Elevator Motion Profiles With Adaptive Overspeed Control
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Solution Overview
Problem
Elevators with different maximum speeds in the same building require separate hoistway pits with different depths due to varying overspeed governor and pit safety equipment dimensions, leading to inefficiencies and increased construction complexity.
Innovation Solution
Implementing a method and system that generates customizable elevator car motion profiles based on destination, allowing for variable maximum speeds and decelerations, and incorporating electronic overspeed monitoring to adjust safety brake triggers, reducing the need for uniform pit dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If elevators with different maximum speeds are installed in the same building, then each elevator can be optimized for its specific speed requirements, but separate hoistway pits with different depths are required, increasing construction complexity and cost
Solution Approach 1:
The patent applies universality by designing a single standardized pit depth that can accommodate multiple elevators with different maximum speeds. The overspeed governor is configured to trigger at different speed thresholds for different elevators, allowing the same physical infrastructure to support varied elevator performances without requiring separate pits for each speed class.
Solution Approach 2:
The patent changes the parameter of overspeed governor triggering speed to differentiate between elevators with different maximum speeds. By adjusting the governor's triggering threshold rather than changing the physical pit depth, the system allows multiple elevators with different speed characteristics to share the same hoistway pit structure.
2Reliability
If pit safety equipment is dimensioned to absorb kinetic energy of elevators moving at maximum speed, then safety is ensured for high-speed elevators, but this increases the depth of the hoistway pit, which is inefficient for low-speed elevators
Solution Approach 1:
The patent changes the triggering speed parameter of the overspeed governor to match different elevator maximum speeds. This allows the same pit depth to be sufficient for all elevators, as each governor triggers its safety brakes at an appropriate threshold for its specific elevator's maximum speed, preventing the need to design pits for the highest possible speed in the building.
Solution Approach 2:
The patent introduces dynamic adjustment of the overspeed governor's triggering threshold based on the specific elevator's maximum speed. This dynamic parameter configuration allows the safety system to adapt to different speed requirements without requiring static changes to the physical pit infrastructure.
3Ease of operation
If a constant speed limit is applied throughout the entire hoistway, then overspeed protection is simplified, but this prevents optimization of motion profiles for different destinations and reduces transport efficiency
Solution Approach 1:
The patent implements dynamic speed profile generation that adjusts the maximum speed and motion parameters based on the destination. The elevator controller generates optimized motion profiles for different destinations, allowing the elevator to travel at higher speeds for longer distances while maintaining safety through destination-specific deceleration zones and adaptive overspeed governor triggering.
Solution Approach 2:
The patent segments the hoistway into different zones with different speed characteristics. The motion profile is divided into acceleration zones, constant speed zones, and deceleration zones, with the deceleration zone extending further from the destination to allow for safer speed reduction. This segmentation enables optimized transport efficiency while maintaining safety.
Data Source
AI summary
The invention relates to a method for operating an elevator system. The method comprises receiving a request to drive an elevator car to a destination and generating an elevator car motion profile to serve the received request. The elevator car motion profile comprises at least the following motion parameters of the elevator car: acceleration, maximum speed, and deceleration. At least one of the maximum speed of the elevator car and the deceleration of the elevator car in the generated elevator car motion profile is defined on the basis of the destination. The invention relates also to a processing unit and an elevator system configured to perform the method at least partly.