Vehicle Rain Sensor Glass Specification Detection
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Solution Overview
Problem
Rainfall measurement by vehicle rain sensors is unreliable due to variations in windshield glass specifications, leading to inconsistent wiper control, as different glass types affect light reflection and signal interpretation.
Innovation Solution
The method involves determining the glass specification of the windshield through frequency analysis of light-receiving signals and applying parameter tuning, including offset removal, phase inversion, sensitivity correction, and amplitude correction, to standardize signal interpretation and adjust sensitivity for accurate rainfall measurement and wiper control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If rain sensor measures rainfall through reflected light amount, then automatic wiper control is achieved, but measurement accuracy varies due to different windshield glass specifications
Solution Approach 1:
The system performs frequency analysis on light-receiving signals to identify glass specification characteristics, then applies parameter tuning (offset removal, phase inversion, sensitivity correction, amplitude correction) to adjust the measurement parameters according to the detected glass type, thereby maintaining accurate rainfall measurement across different glass specifications
Solution Approach 2:
The system uses frequency analysis of the light-receiving signal to detect glass specification and provides feedback to adjust the measurement parameters accordingly, creating a closed-loop system that adapts to different windshield glass types to maintain measurement accuracy
2Device complexity
If light-receiving signal is used directly for rainfall measurement, then measurement process is simple, but deviation occurs due to glass specification differences
Solution Approach 1:
The system performs frequency analysis and glass specification detection before conducting rainfall measurement, and applies appropriate parameter tuning in advance, so that the actual rainfall measurement process remains simple while the reliability is ensured through preliminary adaptation to the glass type
3Measurement precision
If parameter tuning is applied according to glass specification, then measurement accuracy is improved, but system complexity increases
Solution Approach 1:
The system automatically performs frequency analysis to detect glass specification and self-adjusts the measurement parameters through parameter tuning without requiring manual intervention or complex external calibration, thereby improving accuracy while keeping the system operationally simple
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
This approach ensures accurate rainfall measurement and reliable wiper control across various glass specifications, eliminating deviations and generating error signals when normal operation is compromised, thereby maintaining consistent wiper performance.
Implementation Method 1
A rain sensor of a vehicle emits light to the windshield and measures the rainfall through an amount of reflected light
Data Source
AI summary
A rain sensor of a vehicle and a control method thereof are provided to solve a problem that a measurement result of rainfall varies according to a glass specification of a windshield even under the same rainfall condition by tuning sensitivity of the rain sensor in accordance with the glass specification of the windshield. For this, a method of determining the glass specification of the rain sensor includes determining the glass specification of the windshield from a light-receiving signal obtained by receiving light reflected by the windshield of the vehicle, and eliminating a deviation between light-receiving signals by glass specification, which is caused by a difference in the glass specification, by applying parameter tuning according to a glass specification to the light-receiving signal.