Window Glass Trapping Detection Threshold Adjustment
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Solution Overview
Problem
Conventional open-close member control systems for vehicles, such as power windows, often misdetect trapping conditions due to increased sliding load from factors like belt molding deformation or temperature changes, leading to incorrect stops during open or descent movements, which degrades manipulability and requires frequent stops of the window glass, even when no trapping is present.
Innovation Solution
An open-close member control apparatus that includes a driving device, a control device, and a trapping detection section, which compares movement state signals with thresholds to determine trapping, allowing the system to continue movement even with mis-detection and re-start the open movement under specific conditions, using a condition-alleviated state to prevent incorrect stops and ensure continuous operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the trapping detection sensitivity is increased to detect foreign matter trapping, then the reliability of trapping detection is improved, but the frequency of mis-detection increases causing incorrect stops
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the trapping detection threshold based on operating conditions. The control device changes the threshold parameter according to the movement state of the window glass, allowing the system to adapt to varying sliding loads caused by temperature changes, belt molding deformation, and other secular factors. This resolves the contradiction by making the detection sensitivity adjustable rather than fixed, thereby improving reliability without causing excessive mis-detection.
Solution Approach 2:
The patent implements dynamics by transitioning from a static trapping detection threshold to a dynamic one that changes with the movement state. The detection threshold is adjusted in real-time based on whether the window glass is moving up or down, and on the detected movement state. This dynamic approach allows the system to maintain high detection reliability while adapting to changing operating conditions, thereby reducing mis-detection frequency.
2Reliability
If the system stops open movement upon detecting trapping to prevent damage, then the protection function is improved, but the manipulability and continuous operation capability deteriorate
Solution Approach 1:
The patent applies dynamics by making the stop decision dynamic rather than static. Instead of immediately stopping upon any trapping detection, the control device evaluates the movement state and adjusts the detection threshold accordingly. This allows the system to maintain protection functionality while avoiding unnecessary stops that would degrade manipulability, particularly in cases of mis-detection due to secular changes in the system.
Solution Approach 2:
The patent implements feedback by continuously monitoring the movement state of the window glass and using this information to adjust the trapping detection threshold. The system provides feedback to itself about its operating conditions and adjusts its detection sensitivity accordingly. This feedback mechanism ensures that the protection function remains effective while reducing false alarms that would interfere with normal operation and manipulability.
3Reliability
If the trapping detection threshold is set low to detect all trapping cases, then the detection coverage is improved, but the false alarm rate increases due to secular changes in the system
Solution Approach 1:
The patent applies parameter changes by adjusting the detection threshold parameter based on the movement state and operating conditions. Rather than using a fixed low threshold that would cause false alarms due to secular changes like belt molding deformation and temperature effects, the system dynamically modifies the threshold parameter. This maintains comprehensive detection coverage while filtering out false alarms caused by normal system variations.
Solution Approach 2:
The patent implements dynamics by making the detection threshold adaptive rather than static. The threshold changes dynamically based on whether the window is moving up or down, and on the detected movement characteristics. This dynamic adaptation allows the system to maintain high detection coverage for actual trapping events while automatically adjusting to secular changes in the system, thereby maintaining detection accuracy.
Data Source
AI summary
An open-close member control apparatus is to prevent a foreign matter from being trapped to a window glass serving as an open-close member that is driven to open by manipulation of a manipulation switch. When a trapping detection section determines that the foreign matter is trapped to the window glass, power supply to a driving device is stopped to stop opening of the window glass. Then, it is determined whether a predetermined condition is satisfied for approving re-open of the window glass. When the predetermined condition is satisfied, the power supply to the driving device is re-started. Opening of the window glass is thereby enabled again.