Driver Reengagement Timing for Adaptive ADAS Hand-Off
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Solution Overview
Problem
Existing advanced driver assist systems (ADAS) face challenges in managing operator reengagement with the steering wheel, particularly in scenarios requiring hands-on interaction, and current systems struggle to adapt to varying environmental and operational conditions effectively.
Innovation Solution
A system that determines an operator reengagement score based on perception factors (path confidence, road type, adjacent vehicles) and controllability factors (lateral acceleration, road curvature, speed relative to limit) to adjust the reengagement delay, using sensor data and weighting to trigger appropriate vehicle actions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the operator reengagement delay is set to a fixed time period, then the system is simple to operate, but it cannot adapt to varying environmental and operational conditions
Solution Approach 1:
The patent implements a dynamic reengagement delay system that adjusts the time period based on real-time assessment of environmental and operational conditions. The system transitions from a static fixed delay to a dynamic adaptive delay by continuously monitoring factors such as road geometry, traffic conditions, and vehicle speed, then modifying the reengagement delay accordingly. This resolves the contradiction by making the system adaptable to varying conditions while maintaining reasonable operational complexity through automated condition assessment.
Solution Approach 2:
The system changes the time period parameter of the reengagement delay based on detected conditions. By establishing multiple condition categories (e.g., safe, caution, hazardous) and assigning different time period ranges to each category, the system dynamically adjusts the delay parameter without requiring complex manual intervention. This resolves the contradiction by enabling adaptability through parameter modification while keeping the control logic structured and manageable.
2Reliability
If the reengagement delay is reduced for safety, then operator reengagement is ensured timely in challenging conditions, but it increases unnecessary interventions in favorable conditions
Solution Approach 1:
The patent applies different reengagement delay characteristics to different operational contexts. By assessing local conditions (road geometry, traffic, speed) and assigning appropriate delay durations specific to each condition category, the system ensures timely reengagement when needed while avoiding unnecessary delays in safe conditions. This resolves the contradiction by making the delay behavior context-specific rather than uniformly conservative.
Solution Approach 2:
The system continuously monitors operational conditions and uses this feedback to adjust the reengagement delay in real-time. By establishing a feedback loop that detects current conditions, compares them against safety thresholds, and dynamically modifies the delay accordingly, the system achieves reliable safety assurance only when conditions warrant it, thereby minimizing unnecessary delays in favorable conditions.
3Adaptability or versatility
If manual adjustment of reengagement delay is allowed, then the system is flexible, but it increases the difficulty of operation
Solution Approach 1:
The patent implements a self-adjusting reengagement delay system that automatically monitors operational conditions and modifies the delay period without requiring manual operator input. The system serves itself by detecting conditions, determining appropriate delay categories, and applying the corresponding time periods autonomously. This resolves the contradiction by providing flexibility through automatic adaptation while maintaining ease of operation by eliminating manual adjustment requirements.
Data Source
AI summary
A system including a computer having a processor and a memory. The memory includes instructions executable by the processor to determine an operator reengagement score based on sensor data including multiple perception factors and multiple controllability factors. An operator reengagement delay is adjusted based on the operator reengagement score and a vehicle component is actuated upon expiration of the operator reengagement delay.