Vehicle Distracted Driving Detection Using Contact Margin Time
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Solution Overview
Problem
Existing vehicle control systems fail to appropriately determine distracted driving based on the vehicle's surrounding situation, including speed and positional relationship with preceding vehicles, leading to inadequate vehicle control.
Innovation Solution
A vehicle control device that includes a recognizer for surrounding situations, a driving state detector, and a determiner to assess distracted driving by detecting a lack of steering operation for a predetermined time, adjusted by contact margin time and vehicle speed, with controls for steering and acceleration/deceleration to mitigate distracted driving.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed predetermined period of time is used to determine distracted driving, then the determination process is simple, but the determination accuracy is insufficient because it does not consider surrounding situation
Solution Approach 1:
The patent applies dynamics by making the predetermined period of time variable rather than fixed. The time period is dynamically adjusted based on the contact margin time calculated from the vehicle's speed and distance to the preceding vehicle. This allows the determination system to adapt to different driving situations, improving accuracy while maintaining reasonable complexity through automated calculations.
Solution Approach 2:
The patent changes the parameter of time duration based on other parameters (speed and distance). By calculating contact margin time from speed and positional relationship, and using this to determine the appropriate observation period for detecting distracted driving, the system achieves more accurate determination without excessive complexity.
2Reliability
If the predetermined period of time is extended to account for safety margins, then the determination becomes more conservative, but the responsiveness to actual distracted driving decreases
Solution Approach 1:
The system dynamically adjusts the predetermined period of time based on real-time driving conditions. When the contact margin time is large (safe situation), the observation period can be longer, providing conservatism. When the contact margin time is small (risky situation), the system responds more quickly by reducing the required observation period, thus maintaining both reliability and responsiveness.
Solution Approach 2:
The patent changes the time parameter based on the calculated contact margin time. By using speed and distance to determine an appropriate time window, the system ensures that safety margins are maintained while avoiding excessive delays in detecting actual distracted driving situations.
3Speed
If the predetermined period of time is shortened for quick detection, then the response speed increases, but false positives increase due to normal temporary steering releases
Solution Approach 1:
The patent adjusts the time parameter dynamically based on driving conditions. In safe situations with large contact margin times, the system can use longer observation periods to confirm distracted driving, reducing false positives. In urgent situations, shorter periods are used for quick detection, accepting some trade-off in accuracy for immediate safety.
4Adaptability or versatility
If traditional distracted driving detection is used without considering vehicle speed and position, then the system is simple to implement, but appropriate vehicle control cannot be made according to surrounding situation
Solution Approach 1:
The patent makes the determination system multi-functional by integrating it with the existing vehicle control system. The same system that detects distracted driving also considers speed and position information to adjust the determination criteria, and this integrated information is used for both detection and control decisions, reducing overall system complexity while improving adaptability.
Solution Approach 2:
The system uses parameter changes from speed and position data to adapt the distracted driving determination. By incorporating these parameters into the time calculation, the system achieves situation-aware control without requiring a completely separate complex system, as it builds upon existing sensor and control infrastructure.
Data Source
AI summary
A vehicle control device of an embodiment includes a recognizer configured to recognize a surrounding situation of a vehicle. a driving state detector configured to detect a driving state of an occupant of the vehicle, and a determiner configured to determine distracted driving of the occupant on the basis of a result of detection by the driving state detector, in which the determiner determines that the occupant is in distracted driving when a steering operation of the occupant is not detected by the driving state detector for a predetermined period of time or more, and the predetermined period of time is set on the basis of a contact margin time between an obstacle near the vehicle and the vehicle, and a speed of the vehicle.