ABS Brake Control Circuit for Elevator Safety
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Solution Overview
Problem
Elevator brake systems face safety risks due to inadequate dynamic braking and unreliable manual brake release mechanisms, leading to potential injuries or accidents during abnormal conditions, especially in the absence of a machine room where remote operation is necessary but often fails due to corrosion or high mechanical resistance.
Innovation Solution
An ABS brake control circuit that switches between normal and anti-lock brake modes, utilizing a backup power supply and signal identification circuits to enable dynamic braking through repeated brake engagement and release, ensuring safe deceleration and manual rescue capabilities, thereby enhancing brake safety for elevators, escalators, and sidewalks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a large breaking force is applied during emergency braking, then the elevator can stop quickly, but the passengers may be injured due to excessive deceleration
Solution Approach 1:
The patent implements periodic action through ABS (Anti-lock Braking System) that repeatedly engages and releases the brake in a controlled manner during emergency braking. Instead of applying continuous maximum braking force, the system cycles the brake engagement, allowing the elevator to decelerate rapidly while preventing excessive G-forces that would injure passengers. This periodic brake application achieves both quick stopping and passenger safety.
Solution Approach 2:
The patent applies dynamics by transitioning from static braking (fixed braking force) to dynamic braking (variable braking force). The brake controller continuously adjusts the braking force based on real-time conditions, implementing a dynamic braking curve that optimizes deceleration while maintaining passenger comfort and safety. The system adapts the braking force throughout the stopping process rather than applying a constant force.
2Object-affected harmful factors
If a small breaking force is applied during emergency braking, then passenger safety is maintained, but the elevator may not stop in time causing serious accidents
Solution Approach 1:
The patent implements feedback through a brake controller that continuously monitors elevator speed, position, and braking force application. The controller receives feedback signals from sensors and automatically adjusts the braking force to achieve the desired stopping distance while maintaining passenger safety. This closed-loop control ensures the elevator stops reliably without requiring manual intervention or guesswork about the appropriate braking force.
Solution Approach 2:
The ABS system uses periodic brake engagement and release cycles to maintain reliable stopping capability. By repeatedly applying and releasing brake force in a controlled manner, the system ensures the elevator will stop within the required distance while preventing wheel lockup and maintaining steering control, thereby ensuring safety brake effectiveness.
3Ease of operation
If remote operating mode is used to release the brake, then the worker can operate from a distance, but the brake may not release reliably due to corrosion or high mechanical resistance
Solution Approach 1:
The patent replaces the mechanical remote brake release mechanism with an electrical/electronic control system. Instead of using mechanical linkages that are prone to corrosion and high friction, the system uses electrical signals from a remote control device to activate an electromagnetic brake release mechanism. This substitution eliminates the reliability issues associated with mechanical transmission over distance while maintaining ease of remote operation.
Solution Approach 2:
The patent introduces an intermediary - the brake controller and electromagnetic release mechanism - between the remote operator and the brake system. The operator sends an electrical signal through this intermediary system, which then actuates the brake release. This intermediary eliminates the need for direct mechanical connection, allowing reliable remote operation without the corrosion and friction problems of mechanical linkages.
4Ease of operation
If static braking is used in normal operation, then the brake system is simple to operate, but it cannot provide dynamic control during abnormal conditions
Solution Approach 1:
The patent implements universality by designing a brake control system that performs both static braking for normal operation and dynamic ABS braking for abnormal conditions. The same brake controller and actuation system handle both braking modes, eliminating the need for separate mechanical systems. The system automatically selects the appropriate braking mode based on operational conditions, providing both simplicity and adaptability through a single multi-functional system.
Solution Approach 2:
The patent transitions the brake system from static to dynamic operation by implementing a brake controller that continuously adjusts braking force based on real-time conditions. In normal operation, the system provides simple static braking, but upon detecting abnormal conditions, it automatically switches to dynamic ABS braking with variable force application. This dynamic capability is built into the same system that provides simple normal operation, achieving both ease of operation and adaptability.
Data Source
AI summary
An ABS brake control circuit for elevator breaking comprises a brake controller, a backup power supply, a manual rescue instruction circuit, a power grid power-off instruction circuit, a system failure instruction circuit, a signal identification circuit and a brake mode switching circuit. when transport equipments, such as an elevator, an escalator, and so on, encounters a system failure or power grid power-off or needs an emergency rescue, the ABS brake control circuit can allow the transport equipment to transition to a safe brake stop through a previous safe deceleration, thereby eliminating a significant security risk caused by a halt resulted from one-step brake which exists in an elevator brake system, and being capable of ensuring that the manual brake releasing will not cause the phenomena of a stalling of an elevator car and a brake failure of a brake, such that the brake safety of the transport equipments such as an elevator, an escalator, a moving walkway and the like is increased.