Elevator Control System Continuous Acceleration Landing
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Solution Overview
Problem
Existing elevator control systems experience a decline in ride comfort due to vibrations induced during landing control, as the acceleration command discontinuously changes after a delay, leading to discomfort for passengers.
Innovation Solution
An elevator control system that includes a position detecting unit, a point-of-origin detecting unit, multiple pattern generating units, and a run control unit, which generates and selects continuous acceleration patterns from the point-of-origin to the landing position to minimize landing time and reduce vibrations, ensuring smooth deceleration and comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the acceleration command is generated with a delay time tdelay in conventional elevator control, then the control simplicity is maintained, but the ride comfort deteriorates due to discontinuous acceleration changes and car vibrations
Solution Approach 1:
The control system generates the acceleration command in advance based on the present position of the car, eliminating the need for delay-time-based control. By calculating the required acceleration before the car reaches the landing position, the system ensures continuous and smooth acceleration control without abrupt changes that cause vibrations.
Solution Approach 2:
The control system continuously monitors the present position of the car and uses this feedback information to dynamically adjust the acceleration command. This closed-loop control ensures that the acceleration command remains continuous and adaptive to the car's actual position, preventing discontinuities that would induce vibrations.
2Object-affected harmful factors
If multiple pattern generating units with different algorithms are used to generate run patterns, then the ride comfort is improved through continuous acceleration, but the device complexity increases
Solution Approach 1:
The control system dynamically selects the most appropriate run pattern from multiple pre-generated patterns based on the car's present position and speed. This dynamic selection allows the system to adapt to varying operational conditions while maintaining continuous acceleration, optimizing ride comfort without requiring all patterns to be active simultaneously.
Solution Approach 2:
Multiple run patterns are pre-generated using different algorithms before the car reaches the landing position. This preliminary generation allows the control system to have multiple candidate patterns ready for selection, ensuring that a suitable continuous acceleration pattern is always available without requiring complex real-time calculations during critical landing phases.
3Productivity
If the run pattern is selected to minimize landing time based on car speed at point-of-origin, then the productivity is improved, but the control complexity increases
Solution Approach 1:
The control system automatically determines the optimal run pattern by evaluating the car's present position and speed at the point-of-origin detection, and selecting the pattern that minimizes landing time. This self-service approach eliminates the need for manual intervention or complex external control logic, as the system autonomously optimizes landing time based on real-time conditions.
Data Source
AI summary
A position measuring unit detects a present position of a car. A point-of-origin detecting unit detects a passage of the car at a point-of-origin position which is separated by a distance set in advance from a landing position of the car. Each of pattern generating units generates a run pattern based on mutually different algorithms. In each run pattern, an acceleration from before the car passes the point-of-origin position until the car stops is continuous. A pattern selecting unit selects a run pattern which minimizes a landing time as a run pattern which a run control unit causes a run of the car to follow based on a present position. The pattern selecting unit makes the selection based on a speed of the car at a timing when the car passes the point-of-origin position.