Elevator Rescue Brake Control for Smooth Passenger Movement
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Solution Overview
Problem
Conventional rescue systems for machine-roomless (MRL) elevator systems cause jerky vibrations and noise due to the brake being either fully on or off, making it uncomfortable and potentially injurious for trapped passengers, and are not suitable for smooth movement to a desired floor.
Innovation Solution
A rescue braking system comprising a rescue brake controller with a battery, brake release cable, actuator, and motion control that incrementally adjusts the force applied to the brake based on speed and location, allowing for smooth operation by mechanically engaging and disengaging the brake.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the brake is fully on or off in conventional rescue systems, then the system is simple to operate, but the elevator car experiences jerky vibrations and noise
Solution Approach 1:
The brake control system transitions from static (fully on/off) to dynamic (incrementally adjustable) operation. The motion control enables continuous adjustment of brake release cable position, allowing the brake force to vary dynamically based on elevator car speed and location, thereby eliminating jerky vibrations while maintaining operational simplicity.
Solution Approach 2:
The system changes the brake force parameter from discrete (fully engaged/disengaged) to continuous (incrementally adjustable). By modifying the brake release cable position in small increments rather than abrupt transitions, the system achieves smooth brake application and release, reducing vibrations and noise while keeping the control interface simple.
2Device complexity
If the brake is fully on or off in conventional rescue systems, then the system requires minimal control complexity, but passenger comfort and safety are compromised
Solution Approach 1:
The motion control system incorporates feedback from speed detectors and door zone detectors to automatically adjust brake force. This closed-loop control continuously monitors elevator car speed and position, making real-time adjustments to the brake release cable position, thereby ensuring passenger comfort and safety without requiring complex manual control procedures.
Solution Approach 2:
The brake control system performs self-adjustment based on detected conditions. The motion control automatically regulates brake force according to speed and location parameters without requiring constant operator intervention, reducing control complexity while maintaining high reliability for passenger safety and comfort.
3Speed
If the brake release cable is operated abruptly in conventional systems, then the response time is fast, but the elevator car movement becomes unstable
Solution Approach 1:
The motion control system performs preliminary positioning of the brake release cable before full brake engagement. Instead of abrupt brake application, the system gradually adjusts the cable position in increments, preparing the brake for smooth engagement and maintaining elevator car movement stability while preserving rapid response capability.
Data Source
AI summary
A rescue braking system provides a smoother elevator car movement by mechanically lifting or applying the brake. The rescue braking system incrementally adjusts the force applied to the brake based on the speed and location of the elevator car. Therefore, it can effectively eliminate the jerky vibration and noises caused by the fully on-off brake systems and make the passengers feel more comfortable when the elevator car drifts to the nearest floor door.