Elevator Jerk Profile Control via Sinusoidal Transitions
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Solution Overview
Problem
Elevator systems face a trade-off between maximizing traffic handling capacity and ride comfort, as reducing flight time typically compromises ride quality, and improving ride quality often increases flight time, with conventional methods leading to increased jerk and vibration.
Innovation Solution
A controller programmed to manage elevator motion profiles with non-instantaneous transitions between jerk values, allowing for reduced vibration and improved ride quality without lengthening flight time by using different transition rates for different portions of the motion profile.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If acceleration values are decreased to improve ride quality, then vibration levels are reduced, but flight time increases
Solution Approach 1:
The patent changes the jerk parameter profile from conventional square-wave transitions to sinusoidal transitions. This parameter change allows acceleration to be reduced smoothly, decreasing vibration levels while maintaining flight time through optimized transition characteristics.
Solution Approach 2:
The patent implements dynamic transition rates between jerk values, where the transition rate varies during the motion profile. This allows the system to adaptively control acceleration changes, reducing vibration during critical phases while maintaining efficiency overall.
2Loss of time
If jerk values are increased to maintain flight time while decreasing acceleration, then ride quality deteriorates due to higher vibration
Solution Approach 1:
The patent transforms the jerk parameter from high-amplitude instantaneous changes to lower-amplitude sinusoidal transitions. This parameter transformation reduces vibration while maintaining flight time by distributing the acceleration change over a smoother temporal profile.
3Loss of time
If instantaneous transitions between jerk values are used, then flight time is minimized, but ride quality deteriorates due to high vibration
Solution Approach 1:
The patent replaces static instantaneous jerk transitions with dynamic sinusoidal transitions that evolve over time. This dynamic approach smooths the acceleration profile, reducing vibration while maintaining efficient flight time through optimized transition timing.
Solution Approach 2:
The patent applies curved sinusoidal transitions instead of straight instantaneous jumps in the jerk profile. This curvature in the transition profile eliminates abrupt changes, reducing vibration while preserving flight time efficiency.
Data Source
AI summary
An exemplary device for controlling an elevator car motion profile includes a controller (64) that is programmed to cause an associated elevator car (62) to move with a motion profile that includes a plurality of jerk values (78, 82, 86, 90, 96, 100). The controller (64) is programmed to cause at least one transition (84, 88, 94, 98) between two of the jerk values to be at a non-instantaneous transition rate.