Headlight Beam Control Using Ground Speed to Avoid False Vehicle Detection
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Solution Overview
Problem
Existing light distribution control systems struggle to accurately detect vehicles and prevent erroneous detection of roadside objects, leading to inappropriate switching between high and low beams, which can cause daze to other drivers.
Innovation Solution
A light distribution control system that utilizes external sensors to acquire information about objects around the vehicle, including ground speed acquisition units to set variable headlight emission ranges based on ground speed thresholds, preventing high beam emission to vehicles with speeds greater than or equal to a threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If light distribution control is performed based on detection of another vehicle's light, then high beam emission to another vehicle can be prevented, but detection becomes difficult due to disturbance or in case of non-lighting vehicles
Solution Approach 1:
The patent introduces an external sensor as an intermediary detection means to acquire information about objects around the vehicle. This mediator enables vehicle detection through alternative methods (shape, moving direction, speed) when direct light detection fails, thus maintaining reliable high beam control under various conditions.
Solution Approach 2:
The patent changes the detection parameters from light-based to multi-parameter detection including shape, moving direction, and speed. By acquiring ground speed of objects and comparing with threshold values, the system can reliably distinguish vehicles from roadside objects even when light detection is unavailable or unreliable.
2Productivity
If roadside objects are detected using conventional light detection methods, then vehicle detection can be performed, but erroneous detection of roadside objects as vehicles occurs
Solution Approach 1:
The patent changes detection parameters from light-based to multi-parameter detection including ground speed acquisition. By comparing acquired ground speed with threshold values and analyzing moving direction, the system can accurately distinguish moving vehicles from stationary roadside objects, eliminating erroneous detections while maintaining efficient operation.
3Illumination intensity
If high beam is emitted without accurate vehicle detection, then illumination coverage is maximized, but daze is given to drivers of other vehicles
Solution Approach 1:
The patent implements a feedback mechanism where the external sensor continuously monitors the environment, acquires ground speed information, and feeds this back to the light distribution control unit. Based on this feedback, the system dynamically adjusts headlight emission, switching between high and low beams to prevent daze to other drivers while maximizing illumination when safe.
Data Source
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Figure 3
Figure 4A~4B
AI summary
Vehicle-external recognition is performed, and light distribution control over headlights mounted on a vehicle is performed based on the vehicle-external recognition. A configuration includes an external sensor that acquires information about an object around the vehicle, and a ground speed acquisition unit that acquires a ground speed of the object based on an output from the external sensor. An emission range of the headlights is variably set based on the ground speed acquired by the ground speed acquisition unit.