Adaptive Headlamp Vertical Control Using Road Gradient Prediction
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Solution Overview
Problem
Existing adaptive front-lighting systems fail to predict road conditions ahead, leading to blind spots due to gradient changes and inadequate vertical angle control, especially in complex terrains.
Innovation Solution
An adaptive front-lighting system control method that calculates vertical adjustment angles based on electronic horizon data, adjusting illumination angles dynamically to account for gradient changes within a safe sight distance, optimizing lighting to avoid blind spots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
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, leading to blind spots in illumination
Solution Approach 1:
The system performs preliminary action by using navigation map data to predict road conditions (gradients, curves) ahead of the vehicle before actually encountering them. This allows the lighting system to pre-adjust angles to match upcoming road geometry, eliminating blind spots that would occur with reactive sensor-based systems that only respond to current vehicle state
Solution Approach 2:
The navigation electronic map serves as an intermediary between the vehicle and the road environment. Instead of directly sensing road conditions (which requires being at the location), the system uses the map as a mediator to obtain advance information about road geometry, enabling predictive adjustment of lighting angles without physical presence at the upcoming location
2Adaptability or versatility
If navigation map data is used to optimize horizontal front-lighting angle, then road ahead can be predicted, but the common navigation map lacks road gradient information, resulting in no optimization in vertical angle control and blind spots on hillside terrain
Solution Approach 1:
The system segments the road geometry information into two independent components: horizontal geometry (curves, turns) and vertical geometry (gradients, slopes). Horizontal angle control uses horizontal geometry data, while vertical angle control uses gradient data. This segmentation allows each control dimension to be optimized independently with the appropriate data source, solving the limitation of maps that only provide horizontal information
Solution Approach 2:
The system changes the parameter set used for lighting control by incorporating road gradient values (vertical parameter) in addition to horizontal curve information. This parameter expansion enables the vertical lighting angle to be adjusted according to upcoming gradients, eliminating blind spots on hillside terrain that cannot be addressed by horizontal angle control alone
3Ease of operation
If simple angle control based on current gradient is used, then the system is easy to implement, but blind spots are produced due to gradient changes ahead that are not accounted for
Solution Approach 1:
Instead of reacting to current gradient conditions only, the system performs preliminary action by querying the navigation map for gradient data at upcoming locations within the lighting range. This advance knowledge allows the system to adjust lighting angles proactively to match future road geometry, ensuring continuous illumination without blind spots while maintaining reasonable computational complexity
Data Source
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AI summary
The present invention relates to an adaptive front-lighting system control method and terminal device, and a storage medium. The method includes: determining a safe sight distance corresponding to a current position of a vehicle according to a current speed of vehicle; calculating, in combination with the electronic horizon data ahead, a difference of view inclination of each gradient point relative to the current position of the vehicle within the safe sight distance; screening the gradient points sequentially from the farthest gradient point within the safe sight distance until the differences of view inclination corresponding to all the gradient points between the screened gradient point and the current position of the vehicle are within a lighting angle range corresponding to the screened gradient point; and adjusting the illumination angle using the difference of view inclination corresponding to the screened gradient point as the vertical adjustment angle of the adaptive front-lighting system. The present invention provides gradient information of the road out of view for control of the adaptive front-lighting system based on electronic horizon technology, 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.