Vehicle Headlamp Light Distribution Control Timing
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Solution Overview
Problem
Existing light distribution control systems for vehicle headlamps often annoy drivers by frequent changes in illumination due to rapid variations in the positions of multiple vehicles ahead, as they attempt to prevent glare for oncoming vehicles, leading to inefficient control responses.
Innovation Solution
A light distribution control device that delays responses to shrinking vehicle presence ranges and prioritizes follow-up control when ranges expand, using a timing controller with peak hold circuits to manage swivel and leveling adjustments, ensuring the driver of the front vehicle is not glare while minimizing annoyance to the self-vehicle driver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If light distribution control follows fast variations of front vehicle positions to prevent glare, then glare prevention is improved, but the driver of the self vehicle is annoyed by frequent illumination changes
Solution Approach 1:
The patent applies dynamics by making the light distribution pattern adaptive and variable rather than fixed. The cutoff line is dynamically adjusted based on the detected position of front vehicles, allowing the system to respond to changing conditions. The variable shade component enables real-time modification of the light distribution pattern to follow vehicle positions while preventing glare.
Solution Approach 2:
The patent changes the parameters of light distribution by varying the cutoff line position and light intensity in different regions. By adjusting these parameters based on front vehicle detection, the system prevents glare while minimizing unnecessary changes that would annoy the self-vehicle driver. The timing controller manages the rate of parameter changes to balance glare prevention with driver comfort.
2Reliability
If light distribution control responds to small and fast variations of vehicle positions, then glare prevention is improved, but control frequency becomes too high causing annoyance
Solution Approach 1:
The system uses dynamic control with a timing controller that adapts the response characteristics based on the situation. The timing controller filters out small and fast variations that would cause excessive control actions while maintaining responsiveness to significant position changes. This dynamic filtering approach ensures reliable glare prevention without excessive control frequency.
3Object-affected harmful factors
If follow-up speed of light distribution control is increased to track front vehicles, then glare prevention is improved, but the system becomes overly sensitive to position variations
Solution Approach 1:
The patent introduces a timing controller as an intermediary between the vehicle position detection and light distribution control. This intermediary component filters and manages the control signals, preventing direct coupling between detection and actuation. The timing controller reduces the impact of noisy or rapid position variations while maintaining effective glare prevention, thereby simplifying the overall control logic.
Data Source
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AI summary
There is provided a light distribution control device (100) for controlling a light distribution pattern which is formed by light emitted from a vehicle headlamp (RHL, LHL) of a vehicle. The device includes: a vehicle presence range detector (101) configured to detect a vehicle presence range in which a front vehicle (CAR 1) exists in front of the vehicle; a light distribution controller (102) configured to determine the light distribution pattern based on the vehicle presence range so as to prevent the vehicle presence range from being illuminated with the light; a swivel controller (104) configured to control swiveling of the vehicle headlamp; and a timing controller (105) configured to control a swiveling timing of the swivel controller, depending on an area change of the vehicle presence range. When an area of the vehicle presence range is reduced, the timing controller control the swiveling timing of the swivel controller such that swiveling of the vehicle headlamp is delayed.