Windshield Obstruction Classification for Wiper Wear Monitoring
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Solution Overview
Problem
Conventional image processing techniques for detecting moisture conditions on or around a vehicle are limited in effectively distinguishing between water and debris on vehicle windows, leading to inefficient wiper wear monitoring and maintenance.
Innovation Solution
A vehicle system incorporating a camera, window clearing system, and control circuitry that detects obstructions on the window, classifies them as water or debris, and adjusts wiper operations and cleaning fluid application based on classification, with optional manual override and automatic modes for enhanced visibility and wiper wear monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional image processing techniques are used to detect moisture conditions, then the system can detect water on the window, but it cannot effectively distinguish between water and debris
Solution Approach 1:
The system changes the parameter being measured from simple moisture detection to multi-parameter analysis including optical distortion levels, image clarity metrics, and obstruction patterns. This allows differentiation between water (which causes optical distortion) and debris (which causes blocking without distortion), resolving the classification accuracy issue while maintaining manageable system complexity through algorithmic rather than hardware complexity.
2Reliability
If the wiper operates continuously to clear obstructions, then visibility is maintained, but wiper wear increases
Solution Approach 1:
The system applies partial action by operating the wiper only when and where needed based on obstruction classification. When debris is detected, the sprayer applies cleaning fluid partially to affected areas before wiper activation. When water is detected, the wiper operates at reduced intensity or frequency. This selective, partial operation maintains visibility reliability while significantly reducing overall wiper usage and wear compared to continuous operation.
Solution Approach 2:
The system introduces cleaning fluid as an intermediary substance that prepares the window surface before wiper operation. The sprayer applies fluid to debris-obstructed areas, softening and loosening the debris, which then requires less mechanical force from the wiper to remove. This intermediary action reduces the stress and wear on the wiper blade while maintaining effective cleaning performance.
3Productivity
If the wiper operates on debris without cleaning fluid, then clearing speed is maintained, but wiper wear accelerates
Solution Approach 1:
The system performs preliminary action by detecting debris obstructions and automatically activating the sprayer to apply cleaning fluid before the wiper operates. This pre-treatment softens and loosens debris, reducing the mechanical stress required for removal. The control circuitry sequences the operations so that fluid application precedes wiper activation, ensuring the wiper operates on a pre-prepared surface that minimizes wear while maintaining clearing effectiveness.
Solution Approach 2:
Cleaning fluid serves as an intermediary substance between the debris obstruction and the wiper blade. The fluid penetrates and softens the debris, creating a lubricating layer that reduces friction and mechanical stress during wiper contact. This intermediary action allows the wiper to remove debris efficiently without the high-speed, high-stress direct contact that would otherwise cause accelerated wear, thus maintaining productivity while reducing harmful wear effects.
Data Source
AI summary
A vehicle includes a camera configured to capture images through a window of the vehicle, a window clearing system operable between a clearing operation and a cleaning operation, and includes a wiper configured to move along the window in the clearing operation and the cleaning operation, and an interface for manually activating the clearing operation. Control circuitry configured to detect an obstruction on the window based on the images, classify the obstruction as water or debris, detect manual operation of the wiper, determine a wear condition during manual operation of the wiper and based on classification of the obstruction as debris, and communicate a signal to indicate the wear condition.