Motorcycle Headlamp Glare Control During Cornering Tilt
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Solution Overview
Problem
Two-wheeled vehicle head lamps experience unnecessary light non-irradiation ranges when tilted, leading to discomfort for drivers due to enlarged glare-free zones, as existing systems turn off light sources unnecessarily when an oncoming vehicle is detected, even if it doesn't require it.
Innovation Solution
A vehicle lamp system with a controller that adjusts the light distribution pattern based on the vehicle's tilting state, using sensors to detect objects and adjust the non-irradiation range dynamically, ensuring minimal light exclusion and maintaining comfort for the driver by continuing light radiation to necessary areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light source is turned off when an oncoming vehicle is detected in a tilted light distribution pattern, then glare to the oncoming vehicle is prevented, but a non-irradiation range is enlarged to areas that do not require lighting, causing driver discomfort
Solution Approach 1:
The patent applies local quality by creating different irradiation states in different regions of the light distribution pattern. Specifically, the controller selectively turns off light sources only in the glare region (where the oncoming vehicle is located) while maintaining light radiation in other regions below the reference line. This localized control prevents glare to oncoming vehicles while preserving necessary illumination for the driver, thus resolving the contradiction between preventing harmful glare and maintaining driver comfort.
2Object-affected harmful factors
If a non-irradiation range is enlarged to prevent glare in a tilted light distribution pattern, then glare prevention is improved, but the lighting coverage for necessary areas is reduced
Solution Approach 1:
The patent implements local quality by spatially differentiating the light distribution pattern into a glare region and non-glare regions. The controller selectively controls light sources to create a non-irradiation range only in the glare region (above the reference line or where oncoming vehicles are detected) while maintaining irradiation in other regions. This selective local control prevents glare while preserving maximum necessary lighting coverage, resolving the contradiction between glare prevention and lighting coverage.
3Object-affected harmful factors
If the light distribution pattern is adjusted to account for vehicle tilting, then accurate glare prevention is achieved, but the system complexity increases
Solution Approach 1:
The patent applies dynamics by making the light distribution pattern adjustable and adaptive to the vehicle's tilting state. The controller dynamically modifies the light distribution pattern based on detected bank angles, selectively controlling individual light sources to maintain accurate glare prevention throughout cornering maneuvers. This dynamic adjustment enables accurate glare prevention adapted to varying vehicle attitudes without requiring overly complex mechanical or optical mechanisms.
Solution Approach 2:
The patent implements parameter changes by modifying the light distribution pattern parameters (which light sources are active, their intensity, and spatial arrangement) based on the vehicle's tilting angle. The controller adjusts the irradiation pattern parameters in real-time according to the bank angle, enabling accurate glare prevention that adapts to the vehicle's dynamic state while using relatively simple electronic control rather than complex mechanical systems.
Data Source
AI summary
A vehicle lamp includes: a light source; an optical member configured to form a predetermined light distribution pattern by radiating light; and a controller configured to adjust the predetermined light distribution pattern so as to include a first non-irradiation range in which an object outside a vehicle is not irradiated with the light when the object is detected. The controller is configured to define the first non-irradiation range based on a case where a vehicle body is in a straight traveling state. When the vehicle body is in a cornering state, the controller is configured to acquire height information of the object in accordance with a tilting state of the vehicle body, define a second non-irradiation range narrower than the first non-irradiation range based on the height information, and adjust the predetermined light distribution pattern so as to include the second non-irradiation range instead of the first non-irradiation range.