Drive Assist Optical Flow Display Fatigue Adaptation
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Solution Overview
Problem
Existing drive assist systems that change the display of light spots on a windshield for acceleration and deceleration assist can bother drivers and hinder driving by displaying light spots along the vehicle's lane, leading to a need for a system that optimally controls the optical flow presented to the driver.
Innovation Solution
A drive assist system that includes a fatigue degree estimator and a display controller to adjust the display range and speed of an optical flow on the windshield based on the driver's fatigue level and vehicle speed, using sensors to detect vehicle and environmental information, and a HUD device to project the optical flow, ensuring the driver feels appropriate vehicle speed and maintaining visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If light spots are displayed along the vehicle's lane on the windshield for acceleration and deceleration assist, then the driver receives visual feedback for speed control, but the display distracts the driver and hinders driving
Solution Approach 1:
The patent extracts the essential function of speed feedback from the traditional lane-aligned light spot display and relocates it to an optical flow display that does not interfere with the driver's view of the road. The light spots are taken out from their harmful position (along the lane) and transformed into a beneficial optical flow pattern that provides speed information without distraction.
Solution Approach 2:
The patent introduces an optical flow as an intermediary between the vehicle's speed control system and the driver. Instead of directly displaying lane-aligned light spots that cause distraction, the system uses optical flow characteristics (movement speed, direction, pattern) to indirectly convey speed information in a non-distracting manner.
2Adaptability or versatility
If the optical flow display range and speed are fixed, then the system is simple to implement, but it cannot adapt to varying driver fatigue levels and vehicle speeds
Solution Approach 1:
The patent makes the optical flow display dynamic by continuously adjusting its movement speed and display range based on real-time detection of driver fatigue level and vehicle speed. The system transitions from a static display to a dynamic one that adapts to changing conditions, with the optical flow speed being modulated to match vehicle speed and display range being adjusted according to fatigue detection.
Solution Approach 2:
The patent implements feedback loops where driver fatigue is detected and fed back to adjust optical flow display parameters, and vehicle speed is detected and fed back to control optical flow movement speed. This closed-loop feedback system enables automatic adaptation without requiring complex manual configuration.
3Speed
If the optical flow moves at high speed to indicate high vehicle speed, then the driver perceives appropriate speed feedback, but the fast-moving flow becomes difficult to track and may cause discomfort
Solution Approach 1:
The patent changes multiple parameters of the optical flow simultaneously to maintain visual comfort across different speed ranges. When vehicle speed increases, the system adjusts not only the optical flow speed but also its display range, movement pattern, and possibly density of light spots, creating a coordinated parameter transformation that maintains tracking ease despite increased speed.
Data Source
AI summary
A drive assist device includes a fatigue degree estimator and a display controller. The fatigue degree estimator estimates a fatigue degree of a driver of a vehicle. The display controller changes a display range of an optical flow to be presented to the driver, on a basis of the fatigue degree.