Door Drive Locking Element Position Detection via Coil Current
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Solution Overview
Problem
Existing door drive systems with parking devices struggle to accurately and reliably determine the position of a sliding stone along a slide rail between locking and open positions, which is crucial for automatic door closing mechanisms.
Innovation Solution
A procedure that involves monitoring the coil current of an electromagnet, detecting the crossing of a locking element by the sliding stone, and determining its position relative to the locking element using the electromagnet's coil current, thereby eliminating the need for separate position-determining sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a separate sensor is provided next to the locking element for position determination, then the position of the sliding block can be detected, but the device complexity increases and additional sensors are required
Solution Approach 1:
The patent combines the locking element and sensing function into a single integrated component. The locking element itself serves as the sensing element by detecting its own position through the coil current monitoring, eliminating the need for separate sensors and reducing system complexity while maintaining position determination accuracy
Solution Approach 2:
The locking element is given multiple functions: it serves both as the mechanical locking component and as the sensing element for position determination. By monitoring the coil current of the electromagnet coupled to the locking element, the system simultaneously controls the locking mechanism and detects position, making the locking element a multi-functional component
2Reliability
If the coil current is monitored and evaluated, then the position determination is accurate and reliable, but the current intensity must be precisely controlled
Solution Approach 1:
The system utilizes changes in coil current parameters (current intensity and temporal profile) to detect different position states. By monitoring how the current intensity varies over time as the sliding block moves, the system can reliably determine position without requiring complex current control, as the natural current variations during movement provide the detection signals
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution provides precise and reliable automatic position determination of the sliding stone, ensuring accurate control of the door drive system and enhancing the reliability of the automatic door closing mechanism.
Implementation Method 1
an energizable electromagnet. The electromagnet, acting as an actuator, locks the locking element in the locking position when energized with a predetermined current
Implementation Method 2
monitoring the coil current of the electromagnet; detecting an overtravel of the blocking element by the sliding block based on the temporal profile of the monitored coil current
Data Source
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AI summary
The invention relates to a method for determining the position of a sliding block 33 of a door drive comprising a locking device 1. The method comprises at least the following steps: supplying a magnetic coil 23 of an electromagnet 25 coupled to a locking element 5 of the locking device 1 with a current of a predetermined current I2 or a lower current I11; monitoring the coil current of the electromagnet 25; detecting when the sliding block 33 passes over the locking element 5 based on the time course of the monitored coil current; and determining the position of the sliding block 33 relative to the locking element 5 using the detection of the sliding block 33 passing over the locking element 5.Furthermore, the present invention relates to a locking device 1 which is designed to carry out the method according to the invention, and to a door drive with such a locking device 1, a corresponding slide rail and a corresponding sliding block 33.