Vehicle Window Crack Detection via Resistance Measurement
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Solution Overview
Problem
Vehicle windows with thin film heating layers are prone to damage from impacts, leading to potential corrosion and improper function if cracks are undetected, which can result in more extensive cracking and reduced performance.
Innovation Solution
Incorporating conductive layers in vehicle windows that allow for resistance measurements and ohmic heating, using elongated metal terminals to apply localized heating currents and detect cracks, with control circuitry monitoring electrical properties to identify abnormalities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If thin film heating layers are incorporated into vehicle windows, then window heating function is improved, but susceptibility to damage from impacts increases
Solution Approach 1:
The patent implements preliminary crack detection through resistance measurements before the thin film heating layer is fully damaged. By continuously monitoring electrical resistance and detecting changes that indicate crack formation, the system can alert users or activate protective measures before the heating function is completely compromised, preventing further damage and ensuring reliable operation.
2Measurement precision
If resistance measurements are performed continuously to detect cracks, then crack detection capability is improved, but energy consumption increases
Solution Approach 1:
The patent employs periodic resistance measurements rather than continuous monitoring. The control circuitry performs resistance measurements at predetermined intervals or when specific conditions are detected (such as temperature changes or user input), thereby maintaining crack detection capability while significantly reducing energy consumption compared to continuous monitoring.
Solution Approach 2:
The system monitors changes in electrical resistance parameters to detect crack formation. By establishing baseline resistance values and detecting deviations from these baselines, the system can identify crack development without requiring constant high-power measurement, thus reducing energy consumption while maintaining detection precision.
3Ease of operation
If thin film layers are used for heating, then window defrosting function is improved, but risk of corrosion from moisture exposure increases
Solution Approach 1:
The patent implements a feedback mechanism where resistance measurements continuously monitor the integrity of the thin film heating layer. When cracks are detected that could lead to moisture exposure and corrosion, the system can alert users or deactivate the heating function, preventing moisture from penetrating through damaged areas and causing corrosion damage.
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
Enables effective detection of cracks and maintenance of window functionality by applying targeted ohmic heating, preventing corrosion and ensuring window integrity and performance.
Implementation Method 1
Control circuitry in the vehicle may also apply ohmic heating currents to the windows to heat the windows
Implementation Method 2
The control circuitry may make resistance measurements on the windows to detect cracks
Data Source
AI summary
A system such as a vehicle may have windows with one or more conductive layers. The conductive layers may form part of an infrared-light-blocking layer or other layer. The infrared-light-blocking layer or other layer may be formed as a coating on a transparent structural window layer such as an outer or inner glass layer in a laminated window or may be embedded in a polymer layer between the outer and inner layers. Segmented terminals and elongated terminals that may extend past two or more segmented terminals may be coupled to the edges of the conductive layers. Using these terminals, control circuitry can apply localized ohmic heating currents and can make resistance measurements on the conductive layers to detect cracks.