Headlight Optical Axis Control with Roll Motion Correction
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Solution Overview
Problem
Existing optical axis control systems for headlights face errors in pitch angle calculation due to roll angles, leading to incorrect headlight adjustments, and increase processing load, especially when calculating corrections for roll motion.
Innovation Solution
An optical axis control apparatus that determines roll motion during vehicle stop and corrects pitch angle changes using pre-set correction amounts for each roll angle, reducing processing load and improving accuracy by separating stop and travel phases for headlight adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the control device calculates pitch angle using acceleration sensor output values during vehicle stop, then the optical axis angle control is simplified, but the pitch angle calculation contains errors when roll angle is non-zero
Solution Approach 1:
The control device prestores correction amounts corresponding to various roll angles in memory before vehicle operation. When roll angle is detected during vehicle stop, the appropriate correction amount is retrieved and applied to the pitch angle calculation, eliminating the need for complex real-time correction calculations while maintaining high precision.
Solution Approach 2:
The control device dynamically determines whether the vehicle is in stop or travel state based on detected conditions, and switches between different pitch angle calculation methods accordingly. During stop with non-zero roll angle, the device applies correction amounts; during travel or when roll angle is zero, it uses standard calculation, optimizing both precision and computational efficiency.
2Measurement precision
If the control device calculates correction amount using acceleration values during vehicle travel, then the pitch angle error is reduced, but the processing load increases
Solution Approach 1:
Instead of calculating correction amounts in real-time during vehicle travel, the control device prestores multiple correction amounts corresponding to different roll angles in memory during the manufacturing phase. During operation, the device only needs to retrieve the appropriate correction amount based on detected roll angle, dramatically reducing processing load while maintaining precision.
Solution Approach 2:
The control device applies correction amounts selectively only when roll angle is non-zero during vehicle stop, and only retrieves correction amounts when travel state is detected. This partial application of correction logic reduces unnecessary processing operations while ensuring precision is maintained when actually needed.
3Measurement precision
If the control device applies correction for roll angle during vehicle stop, then the optical axis angle accuracy is improved, but the device complexity increases
Solution Approach 1:
The control device utilizes the existing acceleration sensor to detect both vehicle stop state and roll angle, serving multiple functions with a single sensor. The same sensor data is used for both state determination and correction amount selection, eliminating the need for additional sensors or complex measurement systems while maintaining high accuracy.
Solution Approach 2:
The control device prestores correction amounts in memory during manufacturing, organizing them by roll angle values. During vehicle operation, the device simply retrieves the appropriate correction amount based on detected roll angle, transforming a complex real-time calculation problem into a simple lookup operation that maintains accuracy without increasing device complexity.
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
The apparatus effectively corrects pitch angle errors caused by roll angles with high accuracy, reducing processing load and ensuring accurate headlight adjustments, even when roll motion disappears during vehicle travel.
Implementation Method 1
calculates, during stop of the vehicle, a pitch angle by using output values from an acceleration sensor provided for a vehicle
Implementation Method 2
determines, when the vehicle starts traveling, whether there is a rolling motion during the stop of the vehicle
Data Source
AI summary
An optical axis control apparatus includes: an optical axis controlling unit for calculating, during stop of the vehicle, a pitch angle using an acceleration sensor provided in a vehicle and controlling, using the pitch angle, optical axis angles of headlights provided in the vehicle; and a rolling motion determination unit for determining, when the vehicle has started traveling, whether there has been a rolling motion during the stop of the vehicle. When the pitch angle has been changed during the stop of the vehicle and the rolling motion determination unit determines that the rolling motion exists, the optical axis controlling unit corrects, when the vehicle has started traveling and the rolling motion has been terminated, the amount change in pitch angle, using the amounts of correction set for each roll angle, and controls the optical axis angles using the corrected pitch angle.