Adaptive Vehicle Headlamp Beam Control for Overtaking Visibility
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Solution Overview
Problem
Current vehicle headlamp systems experience a 'black hole' effect when switching from high beam to dipped beam during overtaking, causing temporary reduced visibility and increased accident risk, and windscreen wiper systems fail to address visibility loss from splashing water effectively.
Innovation Solution
A method for controlling vehicle headlamps and windscreen wipers that detects an overtaking vehicle in the rear lateral zone, allowing for gradual switching from high beam to dipped beam and increasing wiper speed, respectively, to anticipate and mitigate the 'black hole' effect and visibility loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If headlamps switch rapidly from main beam mode to dipped beam mode when an overtaking vehicle is detected, then the dazzling effect is avoided, but a 'black hole' effect occurs causing temporary reduced visibility and increased accident risk
Solution Approach 1:
The system performs preliminary action by detecting the overtaking vehicle in the rear lateral zone (blind spot) before it enters the main beam area, and initiates the switching sequence in advance. The headlamp switching is triggered earlier than conventional systems, and the wiper speed is increased preemptively to counteract anticipated water splashing, thereby preparing the system before the harmful effect occurs.
Solution Approach 2:
The system applies dynamics by making the headlamp beam dynamic rather than static. The main beam is gradually tilted downward towards dipped beam orientation over a period of time, creating a continuous adaptive transition. This dynamic adjustment allows the beam pattern to adapt smoothly to the changing spatial relationship with the overtaking vehicle, avoiding abrupt visibility loss.
2Object-affected harmful factors
If headlamps switch from main beam mode to dipped beam mode during overtaking, then the overtaking vehicle is not dazzled, but visibility is reduced during the switching period
Solution Approach 1:
The headlamp system dynamically adjusts the beam orientation by gradually tilting the main beam downward towards the dipped beam position rather than making an abrupt switch. This continuous dynamic adjustment maintains optimal illumination for the driver's own lane while progressively reducing intensity in the direction of the overtaking vehicle, thereby balancing both visibility needs.
Solution Approach 2:
The switching process maintains continuity of useful action by ensuring that illumination is continuously adapted rather than abruptly changed. The gradual tilting of the beam and the staged reduction of main beam intensity ensure that useful illumination for the driver's path is maintained throughout the transition, avoiding complete darkness or visibility loss.
3Illumination intensity
If wiper speed is increased to high speed during overtaking, then visibility is regained from splashing water, but energy consumption increases and normal operation is disrupted
Solution Approach 1:
The system applies preliminary action by increasing the wiper speed in advance, before water splashing from the overtaking vehicle actually reaches the windscreen. The detection of the overtaking vehicle in the rear lateral zone triggers preemptive wiper acceleration, so that when water does splash, the windscreen is already being cleared at high speed, maintaining visibility without prolonged high-energy operation.
Solution Approach 2:
The wiper system operates dynamically by continuously monitoring the presence of overtaking vehicles and adjusting wiper speed accordingly. The wiper device transitions between low and high speeds based on real-time detection conditions, optimizing energy consumption by maintaining high speed only when necessary for visibility, rather than operating at constant high speed.
4Reliability
If switching from high beam to dipped beam is done gradually, then the 'black hole' effect is reduced, but the time required for switching increases
Solution Approach 1:
The system recovers lost time by performing preliminary action - detecting the overtaking vehicle in the rear lateral zone before it enters the main beam area and initiating the switching sequence early. This headstart allows the gradual switching process to occur in advance, so that by the time the overtaking vehicle reaches the critical position, the transition is already complete or near-complete, minimizing the effective time visibility is compromised.
Solution Approach 2:
The switching process is made dynamic and adaptive rather than fixed. The duration and rate of gradual switching can be adjusted based on detection parameters such as the distance and speed of the overtaking vehicle. This dynamic control allows the system to optimize the balance between gradual transition (for visibility stability) and switching speed (to minimize time loss).
Data Source
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AI summary
The invention concerns a method of controlling at least one functional member (5, 9) of a motor vehicle (1), said at least one functional member (5, 9) being able to function according to a road mode suitable for driving in the absence of an overtaking vehicle (1a), and a passing mode, suitable for the presence of an overtaking vehicle (1a), characterised in that it comprises the following steps: a. detecting (101) an overtaking vehicle (1a) in a rear lateral zone, b. shifting (105, 111) from the road operating mode to the passing operating mode when the overtaking vehicle (1a) is detected in the rear lateral zone. The invention also relates to a functional unit of a motor vehicle (1) configured to implement the method.