Adaptive Take-Over Interval for Automated Vehicle Control
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Solution Overview
Problem
Existing automated vehicle systems fail to provide an optimal take-over interval for operators to assume manual control, as they do not adequately account for the operator's readiness state, potentially leading to unsafe transitions in unexpected traffic scenarios or situations where the operator is distracted or incapacitated.
Innovation Solution
A system that includes an operator-detection device using cameras and sensors to assess the operator's readiness state, determining a take-over interval based on their alertness and position, and a controller that forecasts the necessary transition time from automated to manual control, providing tailored notifications to ensure the operator can safely assume control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed take-over interval is used for all operators, then the system is simple to implement, but the safety is reduced because it cannot adapt to different operator readiness states
Solution Approach 1:
The take-over interval is made dynamic by continuously monitoring the operator's readiness state through multiple sensors (eye tracking, head position, hand position) and adjusting the notification timing accordingly. When the operator is detected to be in a ready state, the system can provide shorter notice, whereas when distracted or incapacitated, longer notice is provided, optimizing both safety and system responsiveness.
Solution Approach 2:
The system implements feedback loops where sensor data about operator state continuously feeds back to the controller, which then adjusts the take-over notification timing. This closed-loop control ensures the system adapts to real-time operator conditions, improving safety without requiring overly complex predetermined protocols.
2Reliability
If the system provides early notification for operators in distracted states, then the operator has more time to prepare, but the transition may be delayed beyond when it is safely possible
Solution Approach 1:
The notification timing is dynamically adjusted based on real-time operator state detection. The system calculates an optimal notification time that balances preparation needs with safety constraints, providing just-enough-advance-notice rather than fixed early or late notifications. This dynamic timing prevents both premature notification delays and insufficient preparation time.
Solution Approach 2:
The system changes the temporal parameter of notification based on detected operator parameters (eye state, head position, hand position). By varying the notification lead time as a parameter in response to operator state measurements, the system optimizes the balance between preparation time and transition timing for each specific situation.
3Measurement precision
If multiple sensors are used to detect operator readiness, then the accuracy of readiness assessment is improved, but the device complexity increases
Solution Approach 1:
Multiple sensors (eye tracking, head position, hand position) are merged into a unified readiness assessment system. The controller integrates data from all sensors to compute an overall readiness state, where the combined information provides more accurate assessment than any single sensor alone, while the merging process manages the complexity through systematic data integration.
Solution Approach 2:
The sensor system is designed with multi-functionality where each sensor serves multiple purposes in the readiness assessment. For example, camera-based eye tracking can simultaneously detect eye state, head position, and potentially other cues, reducing the need for separate dedicated sensors for each measurement and thereby managing complexity while maintaining precision.
Data Source
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AI summary
A system (10) for changing a control-mode (12) of an automated vehicle (14) from automated-control (16) to manual-control (18) includes an operator-detection device (24) and a controller (26). The operator-detection device (24) is operable to detect a readiness- state (22) of an operator (20) of a vehicle (14) while a control-mode (12) of the vehicle (14) is automated-control (16). The controller (26) is configured to forecast a future-time (32) when the control-mode (12) of the vehicle (14) should change from automated-control (16) to manual-control (18) and determine a take-over- interval (36) for an operator (20) to assume manual-control (18) of the vehicle (14) once notified. The take-over-interval (36) is determined based on the readiness-state (22). The controller (26) is also configured to notify the operator (20) that the control-mode (12) of the vehicle (14) should change from automated-control (16) to manual-control (18) no later than the take-over-interval (36) prior to the future-time (32).