Vehicle Lamp IR Wavelength Control to Prevent Headlamp Interference
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Solution Overview
Problem
Existing obstacle detection devices for vehicles face instability and reduced accuracy in light distribution control due to infrared light interference between left and right headlamps, affecting the determination of obstacles in the vehicle's path.
Innovation Solution
A vehicle lamp system comprising two lamp units with light sources emitting at different peak wavelengths and a light receiving unit to detect reflected light intensity, where the control unit manages light distribution by ensuring the second light source of one lamp unit does not emit light simultaneously with the second light source of the other lamp unit, preventing interference and enhancing accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If infrared light is emitted from both left and right headlamps simultaneously, then obstacle detection coverage is improved, but light distribution control accuracy deteriorates due to cross-interference between headlamps
Solution Approach 1:
The patent implements periodic action by controlling the second light sources of the left and right headlamps to emit infrared light alternately rather than simultaneously. The control unit coordinates the emission timing so that one headlamp emits infrared light while the other remains off, then switches. This periodic emission pattern maintains comprehensive obstacle detection coverage while eliminating cross-interference that would otherwise degrade light distribution control accuracy.
Solution Approach 2:
The control unit performs preliminary action by pre-coordinating the emission timing of the second light sources before actual obstacle detection begins. By establishing a predetermined alternating emission schedule, the system ensures that infrared light from one headlamp does not interfere with the other headlamp's light receiving unit, thereby maintaining measurement precision while achieving comprehensive coverage.
2Measurement precision
If the second light source emits infrared light for obstacle detection, then detection capability is improved, but interference with the first light source's light distribution control occurs
Solution Approach 1:
The system applies periodic action by separating the emission periods of the second light source from the operation periods of the first light source. The control unit orchestrates infrared light emission in periodic intervals that do not overlap with the visible light distribution phases, ensuring that obstacle detection capability is enhanced while light distribution control stability is maintained without mutual interference.
Solution Approach 2:
The patent applies segmentation by dividing the operational timeline into distinct segments: one segment dedicated to infrared light emission for obstacle detection, and another segment for visible light distribution control. This temporal segmentation ensures that the two functions operate independently without interfering with each other, thereby maintaining both detection capability and control stability.
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
This configuration allows for stable and accurate light distribution control, reducing glare and improving visibility by ensuring independent operation of left and right headlamps, thereby enhancing obstacle detection and driving safety.
Implementation Method 1
a second light source configured to emit light having a peak wavelength different from that of the first light source
Implementation Method 2
a light receiving unit configured to detect an intensity of reflected light of the light emitted from the second light source
Data Source
AI summary
The vehicle lamp includes a first lamp unit and a second lamp unit each including a first light source configured to emit an emission beam (visible light), a second light source configured to emit infrared light for sensing having a peak wavelength different from that of the first light source, and a light receiving unit configured to detect an intensity of reflected light of the infrared light emitted from the second light source. The light distribution control is performed on the light emitted from the first light source in accordance with the intensity of the reflected light detected by the light receiving unit, and the peak wavelength of the light emitted from the second light source of the first lamp unit and the peak wavelength of the light emitted from the second light source of the second lamp unit are different from each other.