Vehicle Projection Lamp Timing for Turn Signal Alerting
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Solution Overview
Problem
Existing vehicle projection systems lack optimal lighting timing and mode coordination between turn lamps and projection units, particularly in relation to turn signal lighting, which can lead to inadequate alerting of pedestrians and drivers due to traffic conditions or obstructions.
Innovation Solution
A vehicle projection device with a lighting control unit that adjusts the lighting timing and intensity of projection units based on vehicle speed, ensuring the projection unit reaches target light intensity later than the turn lamp, and employs pulse width modulation to achieve gradual or continuous light intensity changes, optimizing alerting for both low-speed and high-speed travel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the projection unit starts lighting immediately when the turn signal is activated, then the alerting effect is immediate, but the image appears suddenly which may startle pedestrians and drivers
Solution Approach 1:
The patent applies dynamics by making the light intensity change over time rather than remaining static. The projection unit gradually increases light intensity from initial to target brightness, creating a dynamic transition that prevents sudden image appearance while maintaining timely alerting. This temporal dynamic resolves the contradiction between immediate response and gentle alerting.
Solution Approach 2:
The patent changes the light intensity parameter over time during the projection process. By controlling the light intensity to increase gradually from an initial value to a target value, the system transforms the abrupt parameter change into a controlled transition, thereby preventing the harmful effect of sudden image appearance while preserving the speed of response.
2Illumination intensity
If the projection unit reaches target light intensity quickly, then the alerting effect is strong, but the transition time is short which may cause sudden appearance
Solution Approach 1:
The system employs dynamic control of light intensity transition, where the brightness changes continuously over a controlled time period rather than switching abruptly. This dynamic approach allows the projection to reach target intensity while maintaining a reasonable transition duration that prevents sudden appearance.
Solution Approach 2:
The patent ensures continuous action during the light intensity transition by maintaining the projection throughout the duration from initial to target brightness. This continuous useful action guarantees that the alerting function is performed effectively while the intensity builds up gradually, avoiding sudden appearance.
3Device complexity
If the projection unit lighting is synchronized with the turn lamp, then the coordination is simple, but the alerting effect is not optimized for different vehicle speeds
Solution Approach 1:
The patent introduces dynamic adaptation by adjusting the projection lighting timing and characteristics based on vehicle speed conditions. Rather than fixed synchronization, the system dynamically modifies the lighting behavior to suit different speed scenarios, thereby achieving speed-adaptive alerting while maintaining reasonable control coordination.
Solution Approach 2:
The system changes the lighting parameters (timing, duration, intensity progression) based on vehicle speed conditions. This parameter adaptation allows the projection unit to provide optimized alerting effects for different driving scenarios without requiring completely separate control systems, balancing complexity and versatility.
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
Enhances safety by gently alerting pedestrians and drivers at low speeds and quickly alerting them at high speeds through optimized projection timing and intensity adjustments, improving visibility and reducing sudden image appearance on the road surface.
Implementation Method 1
The lighting control unit is configured to perform the lighting control of the light source such that the light intensity increases stepwise or continuously over the required time period
Data Source
AI summary
A lighting timing or lighting mode of a projection unit requires improvement in relation to lighting of a turn lamp. A vehicle lamp includes: a projection unit that includes a light source and projects a predetermined image onto a road surface based on lighting of the light source; and a lighting control unit that controls the light source. The lighting control unit controls the light source such that a required time period from a first time point at which the light source starts lighting in response to an input of a turn signal or a hazard signal to a second time point at which the light source reaches a target light intensity ends later than a third time point at which a turn lamp or a hazard lamp is lit at a target light intensity thereof in response to the input of the turn signal or the hazard signal.