Elevator Safety Device Deceleration Curve Control
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Solution Overview
Problem
Existing elevator safety devices face high computational demands due to continuous monitoring of distance between two cars and the activation curve-dependent calculation of safety distances, which complicates collision prevention.
Innovation Solution
The elevator system employs a safety device that initiates a deceleration curve for one car upon a first braking measure, allowing comparison of speed with a specified value, reducing computational demands by eliminating the need for continuous distance monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous monitoring of distance between two cars is implemented, then collision prevention reliability is improved, but computing capacity demands increase
Solution Approach 1:
The safety device calculates and stores deceleration curves in advance for various initial speeds and distances. When a collision risk is detected, the system simply compares the actual deceleration with the pre-calculated curve rather than performing complex real-time calculations, significantly reducing computing capacity demands while maintaining collision prevention reliability
Solution Approach 2:
The system transforms the continuous monitoring problem into a discrete comparison problem by parameterizing the deceleration behavior. Instead of continuously calculating safety distances based on activation curves, the system uses pre-determined deceleration curves with specific parameters (initial speed, distance, deceleration rate) that can be quickly compared against actual measurements
2Manufacturing precision
If activation curve-dependent calculation of safety distances is performed, then braking precision is improved, but device complexity increases
Solution Approach 1:
The system pre-calculates deceleration curves for various operating conditions (different initial speeds and distances) and stores them for quick reference. This eliminates the need for complex real-time activation curve calculations while maintaining precise braking control through straightforward comparison of actual deceleration with pre-determined curves
Solution Approach 2:
The system uses simplified deceleration curve data structures that can be quickly generated and discarded after use. Instead of maintaining complex activation curve models in memory, the system uses lightweight pre-calculated curve parameters that are computationally inexpensive to store and compare
Data Source
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AI summary
The invention relates to an elevator (1), comprising a first and a second cab (2, 3) that can be moved along a common track. In addition, the elevator (1) comprises a safety device (22, 23) by means of which the two cabs (2, 3) can be monitored and a shaft information system, which is connected to the safety device (22, 32) and by means of which the speed and the position of the two cabs (2, 3) can be determined. If the two cabs (2, 3) fall below a safety distance (D, D'), a first braking action can be taken for at least one first cab (2, 3) by means of the safety device (22, 32). The elevator (1) is characterized in that a deceleration curve (b, b') can be specified for the at least one first cab (3) by means of the safety device (22, 32) when the first braking action is taken. A second braking action can be taken for the at least one first cab (3) by means of the safety device (22, 32) if the deceleration curve (b, b') is exceeded.