Elevator Door Control Device Mass-Based Speed Tracking
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Solution Overview
Problem
Elevator door control systems face reduced followability of actual speed to the speed instruction value when the car door and hall door speeds differ, leading to increased turbulence and longer opening/closing times due to mass differences.
Innovation Solution
An elevator door control device that generates a speed instruction value and determines a motor instruction value based on the mass of the elevator door, identifying the mass at each opening/closing position to ensure the speeds of the car and hall doors coincide, thereby enhancing followability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the door control device controls elevator door motion assuming equal speeds of car door and hall door, then the control system remains simple, but the followability of actual speed to speed instruction value deteriorates when speed difference occurs
Solution Approach 1:
The control device measures the actual speeds of both car door and hall door, calculates their difference, and feeds this information back to the control unit. The control unit then adjusts the motor instruction value based on this feedback to compensate for speed differences, thereby maintaining good followability without requiring a completely complex control system architecture.
Solution Approach 2:
The system dynamically changes the motor instruction value parameter based on the detected speed difference between car door and hall door. By adjusting this control parameter in real-time according to actual operating conditions, the system maintains optimal followability performance across varying speed conditions.
2Weight of moving object
If the mass of hall door increases, then the door structure becomes more robust, but the turbulence increases and followability of actual speed to speed instruction value deteriorates
Solution Approach 1:
The control device continuously monitors the speed difference between car door and hall door and uses this feedback information to adjust motor control. This allows the system to compensate for the inertial effects of heavier hall doors in real-time, maintaining good speed followability despite the increased mass.
Solution Approach 2:
The control system transitions from a static control approach (assuming equal speeds) to a dynamic control approach that continuously adapts to changing conditions. By making the control parameters dynamic and responsive to actual speed differences, the system can handle varying door masses effectively.
3Ease of operation
If the speeds of car door and hall door differ, then the engagement device movement becomes necessary, but the turbulence increases and opening/closing time extends
Solution Approach 1:
The control device uses feedback from speed sensors to detect when speed differences occur between car door and hall door. Based on this feedback, it adjusts the motor instruction value to minimize turbulence and reduce the duration of the engagement device movement, thereby shortening overall opening/closing time.
Solution Approach 2:
The control system takes preliminary action by detecting speed differences early and adjusting motor control before significant turbulence develops. This preventive adjustment reduces the extent of engagement device movement required and minimizes the time penalty associated with speed synchronization.
Data Source
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AI summary
There is provided an elevator door control device in which even in the case where the speeds of a car door and a hall door are different from each other, the followability of actual speed of the elevator door to the speed instruction value of the elevator door can be enhanced. For this purpose, the elevator door control device includes a generating part that generates a speed instruction value of the elevator door in which the car door and the hall door are coupled by engagement, a speed controlling part that determines a motor instruction value given to a motor for driving the elevator door by using the mass of the elevator door so that the speed of the elevator door coincides with the speed instruction value, and an identifying part that identifies the mass of the elevator door at the time when the motor instruction value is determined for each opening/closing position of the elevator door based on the speeds of the car door and the hall door.