Vehicle Headlamp DBL Control for Bend Dazzling Prevention
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Solution Overview
Problem
Traditional motor vehicle headlamps, especially those with dynamic bending light (DBL) functions, can dazzle oncoming drivers due to the fixed camera field of view and beam orientation, which fails to detect oncoming vehicles in time, leading to potential dazzling situations when the vehicle is navigating a bend.
Innovation Solution
A method and system that control the DBL bending light function to change states based on conditions such as active high beam mode and steering wheel angle or curve radius, ensuring the headlamps adjust their beam orientation to prevent dazzling, using a combination of CAN and GPS data for accurate bend detection and adjusting the beam orientation to avoid dazzling oncoming vehicles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the DBL bending light function is activated to illuminate bends, then the road illumination in bends is improved, but the risk of dazzling oncoming drivers increases when the camera field of view diverges from the headlamp beam
Solution Approach 1:
The patent makes the DBL bending light function dynamic by enabling it to change states (first active state, second active state, or inactive state) based on real-time detection of oncoming vehicles and road geometry. The system dynamically adjusts headlamp beam orientation and intensity according to the presence of oncoming traffic and the severity of bends, rather than operating in a fixed manner.
Solution Approach 2:
The system uses feedback from the camera-based obstacle detection system and road geometry data to continuously monitor the environment. When an oncoming vehicle is detected or when the bend severity exceeds thresholds, the system receives feedback and automatically adjusts the DBL function state, creating a closed-loop control system that prevents dazzling while maintaining road illumination.
2Device complexity
If the camera field of view is fixed parallel to vehicle direction, then the obstacle detection system is simple, but it cannot detect oncoming vehicles in bends timely
Solution Approach 1:
The patent applies local quality by making the headlamp beam orientation independent of the fixed camera field of view. While the camera maintains its simple fixed position parallel to the vehicle direction, the headlamps can be oriented at different angles to follow bends. This allows the detection system to remain simple while the illumination system adapts locally to bend conditions.
Solution Approach 2:
The system segments the functions of obstacle detection and road illumination by using the fixed camera for detection and the adjustable DBL headlamps for illumination. This segmentation allows each component to optimize its own function - the camera maintains simple fixed positioning for reliable detection, while the headlamps independently adjust to provide proper illumination in bends.
3Device complexity
If the headlamp beam is oriented straight ahead in traditional configuration, then the lighting system is simple, but it cannot adapt to bend situations
Solution Approach 1:
The patent implements dynamics by enabling the headlamp beam orientation to change based on detected bends and road geometry. The DBL function allows the headlamps to dynamically adjust their orientation and intensity according to the vehicle's path through bends, transforming a static lighting system into an adaptive one that responds to real-time driving conditions.
Solution Approach 2:
The system achieves universality by making the headlamp system perform multiple functions: traditional straight-ahead illumination, bend illumination through DBL, and adaptive adjustment based on oncoming vehicle detection. The same headlamp system can operate in different modes (traditional mode, DBL mode with first active state, DBL mode with second active state) depending on the driving situation.
Data Source
AI summary
A system and method for controlling a vehicle headlamp, the headlamp being equipped with an automatic switching unit between high beam and low beam lighting modes and with a bending light function (DBL). The method comprises a step of making the bending light function (DBL) change from a first active state to a second state for detecting a combination of conditions comprising an active state of the automatic switching unit between high beam and low beam lighting modes and an active state of the high beam lighting mode.