Driver Handover Timing in Automated Vehicle Control
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Solution Overview
Problem
Current vehicle vision systems fail to effectively determine when a driver should take over control from an autonomous or semi-autonomous vehicle, particularly in hazardous conditions, and struggle to estimate the time it takes for the driver to regain control, leading to potential safety issues due to driver distraction or unexpected events.
Innovation Solution
A driver assistance system that processes image and sensor data to determine the driver's readiness to take over, estimating the time it will take for the driver to regain control and deciding whether to continue autonomous control or hand over control based on the estimated recovery time and available time, potentially initiating a safe harbor maneuver if the driver is not ready in time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the autonomous control system hands over control to the driver, then the driver can handle hazardous conditions, but the driver may not be ready in time leading to safety issues
Solution Approach 1:
The system performs preliminary assessment of driver readiness before handover is triggered. By continuously monitoring driver state and pre-evaluating recovery time, the system prepares for potential handover scenarios in advance, ensuring the driver is ready when control transfer is needed.
Solution Approach 2:
The system implements a feedback loop that continuously monitors driver state, assesses readiness, and adjusts handover timing accordingly. The controller receives ongoing information about driver recovery time and uses this feedback to determine the optimal moment for control transfer, ensuring safety while minimizing delay.
2Reliability
If the system continues autonomous control to avoid hazards, then vehicle safety is maintained, but the driver loses control when needed
Solution Approach 1:
The system dynamically adjusts the balance between autonomous control and driver control based on real-time assessment of driver readiness. The control mode is not fixed but adapts continuously, allowing the system to maintain autonomous operation when safe while seamlessly transitioning to driver control when the driver is ready and it becomes necessary.
Solution Approach 2:
The system uses continuous feedback about driver state to determine when to maintain autonomous control versus when to transfer control. The controller monitors recovery time and uses this information to make real-time decisions about control mode, ensuring the driver regains control when needed while maintaining safety through autonomous operation when appropriate.
3Measurement precision
If the system estimates driver recovery time accurately, then handover timing is optimized, but the system complexity increases
Solution Approach 1:
The system introduces a dedicated controller as an intermediary component specifically tasked with assessing driver readiness and estimating recovery time. This specialized component simplifies the overall system architecture by centralizing the complex assessment functions in a single module rather than distributing complexity throughout the entire control system.
Solution Approach 2:
The driver assessment system monitors its own readiness state and provides self-evaluation data to the controller. By having the driver monitoring subsystem work autonomously to assess its own state, the system reduces the computational burden on the main controller and simplifies the overall architecture while maintaining precise recovery time estimation.
Data Source
AI summary
A vehicular control system includes a forward-viewing camera, a forward-sensing sensor and an in-cabin-sensing sensor. With the system controlling driving of the vehicle, the system determines a triggering event that triggers handing over driving of the vehicle to a driver of the vehicle before the vehicle encounters an event point associated with the triggering event. The vehicular control system (i) determines a total action time available before the vehicle encounters the event point, (ii) estimates a driver takeover time for the driver to take over control of the vehicle and (iii) estimates a handling time for the driver to control the vehicle to avoid encountering the event point. Responsive to the vehicular control system determining that the estimated driver takeover time is less than the difference between the determined total action time and the estimated handling time, control of the vehicle is handed over to the driver of the vehicle.