Elevator Brake Control System for Comfort and Reliability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional elevator brake devices suffer from excessive deceleration leading to passenger discomfort and longer braking distances due to a single brake control unit, and inconsistent deceleration during emergency stops, affecting riding comfort based on car position.
Innovation Solution
An elevator apparatus with a dual brake control system, including a first brake control portion for emergency stops and a second brake control portion that reduces braking force when deceleration exceeds a threshold, using independent calculation portions to adjust the threshold based on car position, ensuring reliable stopping and consistent comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single brake control unit performs both basic emergency braking and braking force control, then the device complexity is reduced, but the reliability decreases and riding comfort deteriorates when malfunction occurs
Solution Approach 1:
The brake control unit is divided into a first brake control portion for basic emergency braking operation and a second brake control portion for deceleration control. This segmentation allows each portion to have specialized functions, improving reliability while maintaining manageable complexity through modular design.
2Productivity
If high deceleration is applied during emergency stop, then the stopping distance is reduced, but the riding comfort deteriorates
Solution Approach 1:
The second brake control portion dynamically adjusts the braking force based on real-time deceleration feedback. When deceleration exceeds a threshold value, the control portion reduces braking force to maintain comfortable riding conditions while still achieving effective stopping.
Solution Approach 2:
The threshold value for deceleration control is set to vary according to car position. This parameter change allows the system to optimize the balance between stopping speed and riding comfort based on the specific operational context.
3Object-affected harmful factors
If deceleration control is applied during emergency stop, then the riding comfort improves, but the stopping distance increases
Solution Approach 1:
The deceleration control is applied partially rather than continuously. The second brake control portion activates only when deceleration exceeds the threshold value, providing just enough control to ensure comfort while minimizing the impact on stopping distance.
4Object-affected harmful factors
If the threshold value is set to vary according to car position, then the riding comfort consistency improves, but the control system complexity increases
Solution Approach 1:
The threshold value is configured with local quality characteristics, varying according to specific car positions. This allows the system to provide optimized deceleration control for different operational scenarios while maintaining a relatively simple control structure through position-based parameter adjustment.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
In an elevator apparatus, a brake control device comprises: a first brake control portion for operating a brake device upon detection of an abnormality to stop a car as an emergency measure; and a second brake control portion for reducing a braking force of the brake device when a deceleration of the car becomes equal to or higher than a threshold value at a time of an emergency braking operation of the first brake control portion. The second brake control portion includes a first calculation portion and a second calculation portion, each independently executing an operation of reducing the braking force of the brake device by calculation processing. The threshold value is set in the first calculation portion to vary according to a car position, and the threshold value is set in the second calculation portion as in a case of the first calculation portion.