Vehicle Door Guide Rail Control for Synchronized Sliding Motion
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Solution Overview
Problem
Existing vehicle door systems for passenger transport systems face challenges such as high energy consumption, complex kinematics, and difficulty in hazard detection due to non-uniform load distribution and master-slave drive relationships, which are exacerbated in systems with small wheelbases and steerable wheels.
Innovation Solution
A vehicle door system with guide arms connected to guide rails and driven by Bowden cables, allowing for synchronized movement and adjustable sensor detection areas, and a control system that varies the position offset based on the door's position to optimize drive synchronization and reduce load imbalance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If vehicle door systems use shiftable door elements with multiple drives in master-slave relationship, then the door can be automatically operated, but the load distribution between drives becomes non-uniform due to time delay
Solution Approach 1:
The control system pre-calculates and applies a position offset to the slave drive's setpoint position before the actual movement occurs. This anticipatory adjustment compensates for the time delay in signal transmission and processing, ensuring that both master and slave drives remain synchronized throughout the door movement cycle, thereby maintaining uniform load distribution.
2Length of moving object
If the door travel path extends along the outside of the vehicle, then the door can open fully, but collision with steerable wheels may occur
Solution Approach 1:
The system dynamically adjusts the door travel path based on real-time wheel position data. When wheels are detected to be turned inward, the control system modifies the door's movement trajectory to avoid the wheel area, preventing collisions while still allowing the door to open to a functional extent.
3Extent of automation
If conventional sensor systems are used to monitor hazardous areas, then object detection is provided, but the detection reliability is insufficient for complex door kinematics
Solution Approach 1:
The system merges multiple sensor types (optical sensors, capacitive sensors, and radar) into a unified hazard detection system. Each sensor type detects different aspects of the environment, and their data is integrated to provide comprehensive and reliable hazard detection that accounts for the complex kinematics of the door system.
4Manufacturing precision
If multiple drives are used for door operation, then the door can be controlled precisely, but the device complexity increases
Solution Approach 1:
The control system acts as an intermediary that coordinates the multiple drives through a master-slave relationship with position offset compensation. This intermediary control layer manages the complexity of coordinating multiple drives while maintaining precise door position control, effectively reducing the operational complexity despite having multiple actuation points.
Data Source
AI summary
A vehicle door element (120, 122) for reversibly closing at least part of a body opening (102) on a vehicle (100) comprises a door leaf (124, 126) and at least one guide arm (128, 130, 132, 134) which includes a door-side portion and a vehicle-side portion, wherein the door-side portion of the guide arm (128, 130, 132, 134) is mounted on the door leaf (124, 126), and the vehicle-side portion of the guide arm (128, 130, 132, 134) includes connecting means (140, 142, 144, 146) which are configured for shiftably connecting the vehicle door element (120, 122) to the vehicle (100). The connecting means (140, 142, 144, 146) comprise at least one first connecting means (140, 142) which is configured for shiftable connection to a first guide rail (150, 152) of a vehicle door system (110) of the vehicle (100), and at least one second connecting means (144, 146) which is configured for shiftable connection to a second guide rail (154, 156) of the vehicle door system (110) of the vehicle (100). A sensor device (500) for a vehicle door system (110) comprises a sensor unit (510), an adjusting device (520), and a control unit (530) which is configured to control the adjusting device (520) in dependence on the position of at least one vehicle door element (120, 122) of the vehicle door system (110).