Adaptive High-Beam Control Using Predicted Vehicle-Ahead Position
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Solution Overview
Problem
Conventional vehicle lamp systems experience delays in glare prevention due to processing times for acquired camera or radar data, leading to potential glare on vehicles ahead.
Innovation Solution
A vehicle lamp system that calculates a predicted position of a vehicle ahead based on recent position data and travel road information to adjust high-beam illumination patterns, using a controller to restrict glare by changing the state of illuminated regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If information is transferred to a processing device for computational processing, then the distance and position of the vehicle ahead can be calculated, but a processing time period of several tens to hundreds of milliseconds is required
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing position information in advance. The processing device performs computational processing beforehand to calculate position information, which is then stored in a storage device. During actual operation, the control device directly retrieves pre-calculated position information without performing real-time computation, thereby eliminating processing delays while maintaining calculation accuracy.
2Object-affected harmful factors
If prediction control is performed by setting control-target region based on predicted position, then glare restriction can be achieved, but the position accuracy deteriorates due to the time delay
Solution Approach 1:
The patent resolves this contradiction by pre-calculating position information before it is needed for control. The processing device calculates position information in advance and stores it, so when prediction control is required, the control device can directly use accurate pre-calculated position data without suffering from real-time processing delays, thereby maintaining both glare restriction effectiveness and position accuracy.
Solution Approach 2:
The patent introduces a storage device as an intermediary between the processing device and control device. The storage device stores pre-calculated position information, acting as a buffer that decouples the computational processing from the real-time control requirements. This intermediary allows the system to retrieve accurate position data instantly without performing real-time calculations, thus maintaining both accuracy and responsiveness.
3Productivity
If the light-distribution pattern is switched after processing time, then the vehicle ahead has moved to a different position, but the control-target region becomes inaccurate
Solution Approach 1:
The patent applies preliminary action by having the processing device calculate and store position information in advance before the control device needs it. This pre-calculated position information is already adjusted for the expected time delay, so when the control device retrieves and uses this data, the control-target region remains accurate even though time has passed between calculation and actual control execution.
Data Source
AI summary
A vehicle lamp system includes: a vehicle lamp that can form a high-beam light-distribution pattern in which a state of illuminating one or some illuminated regions is changed among illuminated regions that are separate in a vehicle-width direction; and a controller that can control the vehicle lamp to restrict the state of illuminating the one or some illuminated regions, based on position information having a correlation with the position of a vehicle ahead. The controller calculates a predicted position to which the vehicle ahead is predicted to move after a fixed time period from a reference time, based on the position information acquired anew at the reference time, an amount of change in position of the vehicle ahead calculated from pieces of the position information acquired during a predetermined time period before the reference time, and information on a travel road on which the vehicle ahead travels.