Adaptive Front-Lighting Vertical Control for Road Gradient Blind Spots
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Solution Overview
Problem
Traditional adaptive front-lighting systems (AFS) cannot effectively predict road conditions ahead, leading to inadequate illumination and blind spots, especially in gradient terrains, due to the limitations of current sensors and navigation maps.
Innovation Solution
The method calculates a to-be-adjusted vertical adjustment angle for the AFS based on electronic horizon data, determining a safe sight distance and screening gradient points to optimize the illumination angle, thereby avoiding blind spots caused by gradient changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If traditional sensors (steering wheel sensor, body inclination sensor) are used to adjust lighting angles, then the system can obtain current vehicle state data, but it cannot predict road conditions ahead, resulting in inadequate illumination of the road ahead
Solution Approach 1:
The patent applies preliminary action by using electronic horizon data to predict road gradient information ahead of the vehicle before the vehicle actually reaches those positions. The system calculates expected gradient values at future positions and uses these predictions to pre-adjust the lighting angles, ensuring that the road ahead is properly illuminated before the vehicle arrives. This resolves the contradiction by obtaining road condition information ahead through prediction rather than current sensor measurement.
2Adaptability or versatility
If navigation map data is used to optimize horizontal front-lighting angle, then road ahead prediction is improved, but vertical angle control lacks optimization because common navigation maps do not contain road gradient information
Solution Approach 1:
The patent applies parameter changes by transitioning from using only horizontal position data from navigation maps to utilizing electronic horizon data that includes vertical gradient parameters. The system calculates vertical adjustment angles based on predicted road gradient values, enabling the lighting system to adapt to both horizontal and vertical road conditions. This resolves the contradiction by enriching the data parameters to include gradient information, thereby enabling vertical angle optimization while maintaining horizontal angle adaptability.
3Ease of operation
If simple angle control based on current gradient is used, then the control method is simple, but blind spots are produced when terrain gradient changes, as the illumination angle does not account for gradient variations ahead
Solution Approach 1:
The patent applies preliminary action by predicting road gradient changes ahead of the vehicle using electronic horizon data and calculating the appropriate lighting angle adjustments in advance. The system determines the expected gradient at future positions and pre-adjusts the illumination angles accordingly, ensuring continuous coverage even when terrain gradient changes. This resolves the contradiction by maintaining control simplicity while improving reliability through predictive angle adjustment that accounts for upcoming gradient variations.
4Length of moving object
If illumination angle is adjusted according to expected farthest position gradient, then the lights can reach farther, but blind spots are created due to the difference between expected position gradient and current position gradient
Solution Approach 1:
The patent applies segmentation by dividing the road ahead into multiple segments with different gradient characteristics. Instead of using a single angle adjustment based on the farthest position, the system calculates intermediate gradient points and adjusts lighting angles progressively through each segment. This ensures continuous illumination coverage while maintaining extended reach, resolving the contradiction by segmenting the illumination path to match the segmented gradient profile of the road ahead.
Data Source
AI summary
The disclosure relates to an adaptive front-lighting system control method and terminal device, and a storage medium. The method includes: calculating, based on gradient values of different gradient points in electronic horizon data ahead, a to-be-adjusted vertical adjustment angle of the adaptive front-lighting system, and adjusting an illumination angle of the adaptive front-lighting system with the vertical adjustment angle. The disclosure provides gradient information of the road out of view for control of the adaptive front-lighting system, optimizes the control of vertical angle, and can avoid the blind spot of illumination caused by the change in the gradient in simple angle control, thus being more suitable for the control of the adaptive front-lighting system in a gradient terrain.