Road Illumination Control for Vehicle Deceleration and Reversing
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Solution Overview
Problem
Existing vehicle lighting systems fail to effectively communicate a vehicle's behavior, such as deceleration or reversing, to nearby traffic participants through changes in road surface illumination patterns.
Innovation Solution
A vehicle lighting fixture device with a control unit that adjusts the illumination range or position of light on the road surface in synchronization with the vehicle's behavior, changing the pattern at different speeds during forward travel, deceleration, and reversing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the illumination pattern changes at a constant high speed during forward travel, then the lighting system provides consistent visual information, but traffic participants cannot recognize vehicle deceleration behavior
Solution Approach 1:
The patent applies dynamics by making the illumination pattern change speed variable rather than constant. The control unit adjusts the change speed of the illumination pattern based on vehicle behavior: during deceleration, the change speed is reduced to a lower speed, while during normal forward travel, it maintains a predetermined higher speed. This dynamic adjustment allows traffic participants to recognize vehicle deceleration behavior through the distinctive slower change rate of the illumination pattern.
2Device complexity
If the illumination pattern changes in the forward travel direction only, then the lighting system simplifies control logic, but traffic participants cannot recognize when the vehicle is reversing
Solution Approach 1:
The patent applies inversion by reversing the direction of illumination pattern change when the vehicle reverses. During forward travel, the illumination pattern changes in the forward direction, but when the vehicle reverses, the illumination pattern changes in the reverse direction (opposite to the forward travel direction). This inverted direction provides intuitive visual feedback to traffic participants about the vehicle's reversing behavior while maintaining relatively simple control logic that mirrors the vehicle's actual motion.
3Device complexity
If the illumination pattern uses a single uniform change rate, then the lighting system reduces control parameters, but it fails to provide distinctive visual cues for different vehicle behaviors
Solution Approach 1:
The patent applies local quality by applying different change rates to the illumination pattern based on the specific vehicle behavior state. Instead of using a single uniform change rate, the system applies a first change rate (predetermined speed) during normal forward travel and a second change rate (lower speed) during deceleration. This localized differentiation of control parameters provides distinctive visual cues for different vehicle behaviors while keeping the control system manageable.
Data Source
AI summary
A vehicle lighting fixture device configured to: at a time of forward travel of a vehicle, except during deceleration of the vehicle, control a lighting fixture of the vehicle so as to change, at a predetermined speed in a direction of travel of the vehicle, an illumination range on a road surface of light emitted from the lighting fixture, at a time of deceleration of the vehicle, control the lighting fixture so as to change, at a lower speed than the predetermined speed in the direction of travel of the vehicle, the illumination range on a road surface of the light emitted from the lighting fixture, and at a time of reversing of the vehicle, control the lighting fixture so as to change, in a direction of reversing of the vehicle, the illumination range on a road surface of the light emitted from the lighting fixture.