Laser Headlamp Converter Self-Test via Pattern Comparison
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Solution Overview
Problem
The operability of motor vehicle headlamps with laser converters can be impaired by mechanical damage and aging, leading to eye irritation and glare for other road users, and existing methods lack a simple and cost-effective way to detect such issues.
Innovation Solution
A method involving a motor vehicle with a headlamp that sets and detects a test pattern using a control device and optical detection system, comparing it with a reference pattern to assess the light distribution for damage, and using additional sensors to differentiate converter issues from other headlamp malfunctions, allowing for online testing without disrupting drivers or other users.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a laser and converter are used in the headlamp to generate high-intensity light, then the illumination intensity is improved, but the risk of converter damage and eye irritation increases
Solution Approach 1:
The system performs preliminary testing of the converter's light distribution pattern before actual operation. By projecting a test pattern and comparing it with a reference pattern, the system detects converter damage early, preventing harmful light distribution that could cause eye irritation or glare to other road users.
Solution Approach 2:
The system uses an optical detection device to capture the light distribution pattern and compares it with a reference pattern stored in memory. This feedback mechanism allows real-time monitoring of converter condition and automatic detection of damage, enabling the system to adjust or alert operators to prevent harmful effects.
2Measurement precision
If existing testing methods are used to detect converter damage, then the detection capability is limited, but the system complexity and cost increase
Solution Approach 1:
The motor vehicle performs self-testing of its headlamp converter using its own optical detection device (such as a camera already present in modern vehicles). The system captures images of the light distribution pattern, processes them through evaluation algorithms, and compares results with reference patterns, enabling autonomous damage detection without external testing equipment.
Solution Approach 2:
The system uses existing optical detection devices in the vehicle (such as cameras for other functions) to perform converter damage detection. By making the detection device multi-functional, the system avoids adding dedicated testing equipment, thereby reducing overall system complexity while maintaining high detection precision.
3Speed
If the headlamp is tested continuously to detect converter damage promptly, then the detection speed is improved, but the disruption to drivers and other road users increases
Solution Approach 1:
The system performs converter damage detection at periodic intervals rather than continuously. Testing is conducted at predetermined times (such as when the vehicle is stationary or during scheduled maintenance checks), allowing prompt detection of converter damage while minimizing disturbance to drivers and other road users by limiting when the high-intensity test light is activated.
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
Enables prompt and accurate detection of converter damage, reducing glare and eye irritation by allowing the vehicle to self-test its headlamp operability without external devices, with the ability to identify specific sources of error and adjust the light distribution to compensate for damage until repair.
Implementation Method 1
a laser can be used as a light source. By means of this laser, a converter for emitting converted light can be excited. The laser is usually used to generate light with a particularly high light intensity in a particularly narrow wavelength range
Implementation Method 2
If excited, the converter emits light in another, particularly broad wavelength range, i.e., it converts the light generated by the laser
Implementation Method 3
the test pattern is detected on the surface area by means of an optical detection device
Data Source
AI summary
The invention relates to a method for testing the operability of a motor vehicle (10) with a headlamp (12) which comprises a laser (14) for generating by means of which a converter (16) for emitting converted light is excited, which is emitted by the headlamp (12) for generating a predeterminable light distribution (18) on a surface area (20) in a surrounding area of the motor vehicle (10), wherein the predeterminable light distribution (18) is set by a control device (22) of the headlamp (12). The object of the invention is to check the condition of the converter (16). A test pattern (26, 30) is set by the control device (22) as light distribution (18). The test pattern (26, 30) is detected on the surface area (20) by means of an optical detection device (24) of the motor vehicle (10). The detected test pattern (26, 30) is compared with at a predetermined reference pattern by an evaluation device (28) of the motor vehicle (10). The invention also relates to a motor vehicle (10), which is designed to carry out such a method.