Vehicle Headlight Parallax Correction for Glare Prevention
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Solution Overview
Problem
Existing vehicle headlight control systems inaccurately calculate the direction range for suppressing headlight illumination due to variations in sensor mounting positions, which are not necessarily at the vehicle's center.
Innovation Solution
A headlight control system that acquires the position of a forward vehicle's light source from a sensor, calculates a parallax-corrected direction based on the position deviation between the lighting fixture and sensor mounting positions, and outputs the corrected direction range for suppressing headlight illumination, ensuring accurate calculation regardless of sensor mounting position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the sensor mounting position is not at the vehicle center, then the device complexity is reduced and ease of installation is improved, but the measurement precision of the direction range calculation deteriorates
Solution Approach 1:
The control device acts as an intermediary that receives detection results from the sensor and transforms them into accurate direction range information by calculating parallax based on the known offset between sensor mounting position and lighting fixture mounting position. This mediator function resolves the contradiction by compensating for the non-center sensor position through computational correction.
Solution Approach 2:
The system changes the parameter of direction calculation by introducing parallax calculation that accounts for the position offset. Instead of directly using sensor detection results, the system transforms the directional parameters by calculating the difference between the sensor mounting position and lighting fixture mounting position, thereby maintaining measurement precision regardless of sensor placement location.
2Measurement precision
If parallax correction is calculated based on position deviation between lighting fixture and sensor mounting positions, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The system replaces complex mechanical alignment requirements with a computational solution. Instead of physically aligning the sensor with the lighting fixture center, the patent substitutes this mechanical requirement with a software-based parallax calculation that uses the known position offset to correct direction measurements, thereby reducing mechanical complexity while maintaining precision.
Solution Approach 2:
The control device serves as a mediator that handles the complexity of parallax correction through software algorithms. By centralizing the computational correction function in the control device, the system manages the increased complexity in a controlled manner while achieving improved measurement precision without requiring hardware modifications.
3Ease of operation
If the direction range calculation uses sensor mounting position as reference, then the ease of operation is improved, but the reliability of glare prevention deteriorates
Solution Approach 1:
The system incorporates feedback by using the known position offset between sensor and lighting fixture as a correction parameter. The control device continuously applies this feedback information to adjust direction range calculations, ensuring that glare prevention remains reliable even when the sensor is mounted at convenient non-center positions. This feedback mechanism maintains reliability without compromising operational simplicity.
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
The system accurately determines the direction range for suppressing headlight illumination, improving accuracy and preventing glare for both preceding and oncoming vehicles, regardless of sensor placement.
Implementation Method 1
acquires, from a sensor mounted in a predetermined sensor mounting position in the vehicle, a position of a target light source of a forward vehicle
Data Source
AI summary
A lamp ECU acquires, from a sensor, a position of a target light source of a forward vehicle when viewed from a sensor mounting position, calculates, on a basis of an amount of position deviation between a lighting fixture mounting position and the sensor mounting position, a parallax-corrected direction of a target position, based on the acquired position of the target light source, when viewed from the lighting fixture mounting position, and outputs a light shielding range on a basis of the calculated parallax-corrected direction.