Vehicle Lamp Auto-Leveling Control via Dynamic Threshold Adjustment
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Solution Overview
Problem
Existing auto-leveling control systems for vehicle lamps, which rely on inclination sensors like acceleration sensors, face challenges in achieving high performance, particularly in determining vehicle attitude angles accurately during various driving conditions such as turning, rough road travel, and slope driving, leading to suboptimal illumination adjustments.
Innovation Solution
A control apparatus for vehicle lamps that includes a threshold value adjustment section to adjust turning and rough road traveling determination thresholds based on vehicle speed and acceleration, using a tri-axial acceleration sensor to derive vehicle attitude angles by plotting detection values on a coordinate system and calculating linear approximation formulas to enhance the accuracy of optical axis adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If an acceleration sensor is used as an inclination sensor for auto-leveling control, then cost and weight of the vehicle can be reduced, but the performance of the auto-leveling control needs further improvement
Solution Approach 1:
The patent applies dynamics by making the threshold values dynamic rather than fixed. The turning determination threshold and rough road traveling determination threshold are adjusted based on vehicle speed and acceleration conditions. This allows the system to adapt to different driving scenarios, improving measurement precision and reliability while maintaining the use of cost-effective acceleration sensors.
Solution Approach 2:
The patent changes parameters by adjusting determination thresholds based on vehicle operating conditions. By modifying the threshold values according to vehicle speed and acceleration, the system optimizes its performance across different driving scenarios, resolving the contradiction between using simple sensors and achieving high performance.
2Device complexity
If fixed threshold values are used for determining turning and rough road traveling states, then the control logic is simple, but the accuracy of vehicle attitude angle derivation is insufficient under varying driving conditions
Solution Approach 1:
The patent transforms fixed thresholds into dynamic thresholds that adapt to vehicle speed and acceleration conditions. This resolves the contradiction by introducing conditional logic that adjusts thresholds based on operating state, improving measurement precision without excessive complexity increase.
Solution Approach 2:
The patent changes the parameters (threshold values) based on vehicle operating conditions. By adjusting thresholds according to speed and acceleration, the system achieves higher accuracy in vehicle attitude angle derivation while maintaining reasonable control logic complexity.
3Quantity of substance
If detection values during turning and rough road traveling are included in straight line derivation, then more data points are available for calculation, but the accuracy of vehicle attitude angle is reduced
Solution Approach 1:
The patent extracts and excludes detection values obtained during turning and rough road traveling states from the straight line derivation process. By identifying and removing these problematic data points based on threshold comparisons, the system maintains measurement precision while still utilizing valid detection values for calculation.
Solution Approach 2:
The patent implements feedback by using determination thresholds to identify invalid detection values and exclude them from calculations. This feedback mechanism ensures that only reliable data points contribute to the vehicle attitude angle derivation, maintaining high measurement precision.
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 improves the accuracy of auto-leveling control by distinguishing between different driving states and adjusting thresholds accordingly, resulting in enhanced performance and optimal illumination adjustments across various driving conditions.
Implementation Method 1
an acceleration sensor 110 to detect acceleration in a vehicle vertical direction
Data Source
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AI summary
A control apparatus (100) for a vehicle lamp (210) includes a receiver (102) and a controller (104). The receiver (102) receives detection values of an acceleration sensor (110). The controller (104) plots the detection values to derive a straight line and outputs an adjustment signal that instructs to adjust an optical axis (O) of the vehicle lamp (21) based on a gradient of the straight line. A vehicle attitude angle (θv) can be estimated from the gradient of the straight line. If the detection values to be used to derive the straight line include a detection value that is obtained when the vehicle (300) is in a predetermined traveling state which lowers an accuracy of estimation of the vehicle attitude angle (θv) from the gradient of the straight line, the controller (104) derives the straight line with excluding this detection values and adjusts the optical axis (O), avoids an output of the adjustment signal, or outputs a maintenance signal.