Swing Door Braking Control for Smooth Opening
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Solution Overview
Problem
Existing vehicle door devices do not adequately ensure smooth opening and closing actions by insufficiently reflecting the viewpoint of braking control for swing doors, leading to potential vibrations and impaired smoothness when reaching the fully open position.
Innovation Solution
A door device with a braking control unit that applies a braking force to the swing door by controlling an electromagnetic brake, setting a strong opening prevention boundary on the closing direction side from the fully open position and applying a braking force to the swing door that opens on the opening direction side from this boundary, ensuring smooth operation by gradually changing the braking force to prevent sudden stops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a braking force is applied to the swing door when it opens close to the non-contact limit position, then the smoothness of the opening action is improved, but the door may not reach the fully open position smoothly
Solution Approach 1:
The control unit applies different braking control strategies to different regions of the door opening stroke. A strong opening prevention boundary is set at a predetermined angle from the fully open position, creating distinct control zones: one where braking is applied to prevent strong opening, and another where braking is relaxed to allow smooth completion of opening. This local differentiation resolves the contradiction by ensuring smoothness in the critical region while maintaining reliability for reaching the fully open position.
Solution Approach 2:
The braking force is dynamically adjusted based on the real-time opening angle of the swing door. The control unit continuously monitors the door position and modulates the braking force magnitude, applying stronger braking when the door approaches the strong opening prevention boundary and reducing braking as the door nears the fully open position. This dynamic adjustment ensures both smooth operation and reliable completion of the opening action.
2Reliability
If a strong braking force is applied to prevent the door from reaching the fully open position, then opening prevention is improved, but the smoothness of the closing action deteriorates due to potential vibrations
Solution Approach 1:
The braking control is localized to specific angular regions. The strong opening prevention boundary is positioned at a predetermined angle from the fully open position, ensuring that strong braking is applied only in the region where opening prevention is needed, while the closing action in other regions remains smooth and vibration-free.
Solution Approach 2:
The control unit proactively applies braking force before the door reaches the strong opening prevention boundary, preventing the door from strongly reaching the fully open position. This preliminary braking action avoids the need for sudden, strong braking at the limit position, thereby preventing vibrations that would degrade closing smoothness.
3Reliability
If the braking boundary is set close to the fully open position, then the door can reach the fully open position, but the smoothness of the opening action deteriorates due to vibrations
Solution Approach 1:
The control unit begins applying braking force in advance when the door approaches the strong opening prevention boundary (positioned at a predetermined angle from the fully open position). This preliminary braking prevents the door from strongly reaching the fully open position, avoiding vibrations and ensuring smooth opening action throughout the entire stroke.
Solution Approach 2:
The braking force is dynamically modulated based on the door's real-time position. As the door approaches the strong opening prevention boundary, the braking force increases gradually. As the door nears the fully open position, the braking force is reduced or eliminated, allowing the door to complete its opening smoothly without vibrations.
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
The solution effectively prevents the swing door from strongly reaching the fully open position, avoiding vibrations and ensuring a smooth action by applying a controlled braking force, allowing for safe and comfortable operation.
Implementation Method 1
a braking control unit applying a braking force to a swing door of a vehicle by controlling an operation of a braking device
Data Source
AI summary
A vehicle door device includes: a braking control unit applying a braking force to a swing door of a vehicle by controlling an operation of a braking device; and an action position detection unit detecting an action position of the swing door. The braking control unit sets a strong opening prevention boundary on a closing direction side from a fully open position as a mechanical opening action limit of the swing door and applies a braking force to the swing door that opens on an opening direction side from the strong opening prevention boundary.