Door Drive Control for Manual Closing Assistance
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Solution Overview
Problem
Manual operation of building doors with electric drives often results in mechanical play and counter pressure issues, leading to incomplete sealing and increased effort, due to mechanical play in the drive system and counter pressure from door seals.
Innovation Solution
A door drive system with a position sensor that detects manual movement near the 'DOOR CLOSED' position, switches on the motor to gently guide the door into its natural end position, correcting for mechanical slip and play, and includes a door drive control that automatically adjusts speed and power to ensure proper sealing and reduce manual effort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the door is manually closed without motor assistance, then the user can operate the door freely, but mechanical play and counter pressure prevent complete sealing and increase closing effort
Solution Approach 1:
The system performs preliminary detection of manual closing action and prepares motor assistance in advance by activating the motor before the door reaches the closing position, ensuring the door is properly sealed before the user completes the closing motion
Solution Approach 2:
The motor-driven door operator acts as an intermediary between the user's manual closing force and the door leaf, providing supplemental force to overcome mechanical play and seal counter pressure, ensuring complete sealing while reducing the effort required by the user
2Measurement precision
If the motor drives the door to the closing position, then positioning accuracy improves, but mechanical play in the drive system reduces sealing effectiveness
Solution Approach 1:
The system activates the motor in advance during the closing approach and maintains motor assistance through the final sealing phase, compensating for mechanical play that occurs in the drive system before and during engagement with the door frame
Solution Approach 2:
The control unit monitors the door position and closing force, adjusting motor output in real-time to compensate for mechanical play and ensure the door leaf achieves complete sealing despite variations in the mechanical drive system
3Reliability
If the motor provides continuous assistance during closing, then sealing is improved, but the complexity of the door drive system increases
Solution Approach 1:
The motor provides assistance only during the critical closing phase when sealing is required, rather than continuous operation, reducing control complexity while maintaining sealing quality through targeted motor intervention in the closing zone
Data Source
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AI summary
The invention relates to a method for operating a door drive (14) connected to a leaf (18) of a building door (10), in order to provide for a comfortable manual actuation of a building door comprising a door drive. Said method comprises: sensing if the leaf (18) is being moved manually in the closing direction into a closing end range (72) adjoining the closing end position, and pulling the leaf (18) closed in a motor-driven manner by driving the leaf (18) into the closing end position if the leaf (18) is in the closing end range (72).