Vehicle Rear Lighting Flux Control for Trunk Door Position
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Solution Overview
Problem
Existing motor vehicle lighting systems with movable and fixed light parts struggle to maintain consistent luminous flux intensity when the trunk door is open or closed, leading to inefficient energy use and non-compliance with regulatory light intensity requirements.
Innovation Solution
A lighting device with means to control the power supply of light sources based on the relative position of the movable and fixed parts, adjusting the intensity of the luminous flux emitted by each source to meet regulatory light intensity standards, using a signal indicative of the relative position and controlling the electric current intensity to achieve the necessary flux levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the trunk door is opened to provide wide trunk opening, then the trunk accessibility is improved, but the space available for mounting fixed rear lights becomes restricted and the luminous flux intensity becomes inconsistent
Solution Approach 1:
The lighting system dynamically adjusts the luminous flux intensity of individual LED sources based on the trunk door position. When the trunk door is opened, the control unit modifies the intensity of lights on the movable support to compensate for the changed optical path and visibility conditions, maintaining consistent overall luminous flux intensity regardless of door position.
2Device complexity
If common power supply is used for both fixed and mobile light parts, then the device complexity is reduced, but the energy management efficiency deteriorates
Solution Approach 1:
The power supply system provides differentiated power management to different light sources based on their location and function. The control unit independently controls the luminous flux intensity of each LED source or group of sources, allowing optimized energy distribution where mobile lights receive adjusted power based on trunk door position while fixed lights maintain standard operation, improving overall energy management efficiency.
3Ease of operation
If the trunk door is opened, then the trunk accessibility is improved, but the luminous flux intensity emitted by the light sources becomes inconsistent with regulatory requirements
Solution Approach 1:
The system incorporates a control unit that receives feedback regarding the trunk door position (open or closed state) and automatically adjusts the luminous flux intensity of the light sources accordingly. This closed-loop control ensures that the overall luminous flux emitted by the rear lighting system consistently meets regulatory requirements regardless of whether the trunk door is open or closed.
4Use of energy by moving object
If individual LED intensity is adjusted based on position, then the energy efficiency is improved, but the device complexity increases due to additional control mechanisms
Solution Approach 1:
The control unit performs multiple functions: it monitors the trunk door position, determines the appropriate luminous flux intensity based on position feedback, and independently controls the power supply to multiple LED sources. This multi-functional approach consolidates what could be multiple separate systems into a single integrated control unit, managing energy efficiency without proportionally increasing system complexity.
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
Ensures efficient and economical management of electrical energy by adjusting light intensity according to the trunk door position, ensuring compliance with regulatory light intensity requirements and optimizing energy usage.
Implementation Method 1
An LED is a semiconductor component, which, when an electric current of a predetermined intensity passes through it, emits light rays. A luminous flux of a predetermined intensity, generally related to the intensity of the electric current passing through the LED, can then be measured.
Data Source
Figure 1~3
AI summary
The invention provides a device and a method for managing the luminous flux emitted by fixed (110, 210, 310) and moving (120, 220, 320) parts of a lighting system (100, 200, 300) for a motor vehicle. Remarkably, the management of the luminous flux takes into account the relative position between the different parts of the lighting system.