Vehicle Lamp LIDAR Aiming Using an Inclined Reference Screen
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Solution Overview
Problem
The existing aiming adjustment methods for vehicle lamps with LIDAR devices face challenges in accurately aligning the optical axes due to the narrow detection range of LIDAR devices, making it difficult to determine the inclination of the headlamp, especially when dealing with vehicles of different heights, and complicating the adjustment process.
Innovation Solution
An aiming adjustment method and apparatus that utilize a screen in front of the LIDAR device to detect the state of its surface, allowing for the detection of angular errors in the posture of the vehicle lamp, which are then corrected using a diagnostic device and actuator to ensure precise alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a target is provided on a vertical screen for LIDAR detection during aiming adjustment, then the headlamp direction can be adjusted, but the target may fall outside the narrow detection range of the LIDAR device making proper adjustment difficult
Solution Approach 1:
The screen surface is changed from a vertical orientation to an inclined orientation at a specific angle (e.g., 45 degrees). This dimensional change allows the LIDAR device to detect the target within its narrow detection range while still obtaining accurate angular error information for aiming adjustment in both pitch and roll directions.
Solution Approach 2:
The detection angle of the LIDAR device is set to match the inclination angle of the screen surface. By changing the parameter of screen inclination, the system enables the LIDAR to detect distance changes that correspond to angular errors in multiple directions, overcoming the limitation of narrow detection range.
2Device complexity
If a vertical screen is used for detection, then the setup is simple, but it is impossible to determine the up-down tilt direction of the headlamp since the detected distance change amount is the same regardless of deviation direction
Solution Approach 1:
By inclining the screen surface, the system transforms the detection geometry such that distance changes now encode both magnitude and direction of angular errors. The inclined surface creates different effective detection paths that preserve directional information that would be lost with a vertical screen.
3Adaptability or versatility
If the same screen target is used for all vehicle types, then the system is simple, but aiming adjustment work becomes complicated when vehicles of different heights are produced in line
Solution Approach 1:
The inclined screen serves multiple functions: it provides a detectable target for LIDAR, encodes angular error information, and works with vehicles of different heights. The geometry of the inclined screen naturally accommodates variations in headlamp height positions without requiring changes to the screen itself, enabling universal application across different vehicle models.
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 method enables high-accuracy aiming adjustments even with LIDAR devices having a narrow detection range, simplifying the process for vehicles of varying heights and improving the accuracy of adaptive driving beam control and automatic driving systems.
Implementation Method 1
a light detection and ranging (LIDAR) device
Implementation Method 2
detecting a state of a surface of the screen by the LIDAR device
Data Source
AI summary
An aiming adjustment method for adjusting a posture of a vehicle lamp provided with a LIDAR device includes: providing a screen in front of the LIDAR device; detecting a state of a surface of the screen by the LIDAR device; detecting an angular error of the posture of the vehicle lamp based on a detection signal indicating the detected state of the surface; and correcting the posture of the vehicle lamp based on the angular error.