Vehicle Door Window Retention at High Speeds
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Solution Overview
Problem
Frameless vehicle doors struggle to securely retain the window glass at high speeds due to pressure differences, leading to potential ejection of the window from its seals, and existing solutions are not strong enough to prevent this issue while maintaining aesthetic appeal.
Innovation Solution
A motor-operated window system with three predetermined positions, where the window is resiliently retained within a seal at low speeds, retracted from the seal at moderate speeds, and extended into the seal at high speeds to prevent ejection, utilizing a flexible seal and structural retention to manage pressure differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the window is resiliently retained within the seal at high speeds, then the window is securely held against pressure differences, but the door cannot be opened in emergency situations without damaging the cover
Solution Approach 1:
The system dynamically adjusts the window position between two states: normally retained within the seal at high speeds for security, and retractable to a first position where the distal edge clears the seal to allow emergency door opening. The motor management unit controls this dynamic repositioning based on operational conditions.
Solution Approach 2:
Before the door can be opened in an emergency, the window must first be retracted to the first position by the motor management unit. This preliminary action clears the distal edge of the window from the seal, preventing damage to the cover when the door is subsequently opened.
2Ease of operation
If the window is retracted from the seal, then the door can be opened easily, but the window is not securely retained at high speeds and may be ejected
Solution Approach 1:
The system dynamically adjusts the window position between two states: normally retained within the seal at high speeds for security, and retractable to a first position where the distal edge clears the seal to allow emergency door opening. The motor management unit controls this dynamic repositioning based on operational conditions.
3Ease of operation
If a flexible seal is used to allow easy door opening, then the door can be opened without damaging the cover, but the seal is not strong enough to securely retain the window at high speeds
Solution Approach 1:
The system dynamically adjusts the window position between two states: normally retained within the seal at high speeds for security, and retractable to a first position where the distal edge clears the seal to allow emergency door opening. The motor management unit controls this dynamic repositioning based on operational conditions.
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 system ensures the window glass is securely retained at high speeds, preventing ejection and maintaining the door's aesthetic appeal by using a motor management unit to adjust the window's position based on speed, enhancing safety and performance.
Implementation Method 1
the window piece is resiliently retained within the seal
Data Source
AI summary
A vehicle comprises an outer shell having an opening and a cover for the opening. The cover comprises: a housing, a window and a motor for moving the window. The motor management unit stores three predetermined positions of the window relative to the housing. When the housing is engaged with the opening: in the first predetermined position the window is resiliently retained within the seal and the cover can be released from the opening without damage to the cover; in the second predetermined position the window does not engage with the seal; and in the third predetermined position the window extends into the seal and the window is prevented from being released from the seal without the window first being retracted to the first or second positions. The motor management unit causes the motor to extend the window to the third predetermined position when the vehicle exceeds a predetermined speed.