Adaptive Front Lighting System Motor Failure Dazzling Prevention
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Solution Overview
Problem
The Adaptive Front Lighting System (AFLS) faces issues with dazzling opposing vehicles or pedestrians when the motor fails during dynamic bending, and existing fail-safe methods either cause excessive downward irradiance or require complex and costly electromagnetic wave-based leveling actuators.
Innovation Solution
The system includes a motor driver, power supply unit, and controller that generate and respond to motor fault signals to adjust the electric power supplied to LED lamps, selectively blocking power to specific lamps to prevent dazzling by comparing current and previous beam irradiation directions, thereby maintaining safe lighting without motor operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a leveling actuator is used to compulsively downwardly direct the beam to prevent dazzling, then opposing vehicle dazzling is prevented, but driver visibility at nighttime is deteriorated due to excessive downward irradiance
Solution Approach 1:
The patent applies local quality by selectively controlling individual LED lamps or groups of LED lamps based on their specific beam directions. When motor failure is detected, the controller identifies which LED lamps are pointing toward opposing vehicles or pedestrians and selectively reduces or blocks power only to those specific lamps, while maintaining normal operation of lamps pointing in safe directions. This resolves the contradiction by preventing dazzling locally without compromising overall driver visibility.
2Object-affected harmful factors
If a leveling actuator with electromagnetic wave-based control is used to prevent dazzling, then opposing vehicle dazzling is prevented, but manufacturing cost and system complexity are increased
Solution Approach 1:
The patent extracts and eliminates the separate leveling actuator component from the system. Instead of using a dedicated electromagnetic wave-based leveling actuator, the invention repurposes the existing AFLS motor and controller to detect motor failure and selectively control LED lamp power. This removes the need for additional control equipment and parts, significantly reducing system complexity and manufacturing cost while still achieving the dazzling prevention function.
Solution Approach 2:
The patent applies universality by making the existing AFLS motor and controller perform multiple functions: normal dynamic bending operation, motor failure detection, and selective LED lamp power control for dazzling prevention. The controller that originally only controlled beam direction now also detects motor faults and adjusts LED power accordingly, eliminating the need for separate dedicated components and reducing overall system complexity.
3Object-affected harmful factors
If selective power control of LED lamps is implemented based on motor fault detection, then dazzling is prevented without motor operation, but additional control equipment is required
Solution Approach 1:
The patent merges the dazzling prevention control function with the existing AFLS control system. The controller that originally controlled the AFLS motor for dynamic bending operation is extended to also detect motor failure and selectively control LED lamp power. By combining multiple functions into the existing controller, no additional control equipment is needed, and the system achieves dazzling prevention using already-available components.
Data Source
AI summary
Provided is an Adaptive Front Lighting System and a control method thereof, which includes a motor driver which controls a beam irradiation direction of a headlamp by operating a motor coupled to the headlamp according to a motor control signal, and generates a motor fault signal when fail occurs in the motor, a power supply unit which controls a magnitude of electric power supplied to the headlamp according to a power control signal, and a controller which selectively outputs the power control signal to the power supply unit according to the motor fault signal of the motor driver.