Hands-Free Driving Error Handling for Sensor Failure Takeover
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Solution Overview
Problem
Current driver assistance systems for hands-free driving in vehicles are limited in their ability to maintain safety during failures of sub-sensors, often deactivating the mode entirely upon detection of any error, which can lead to unsafe transitions from automated to manual control.
Innovation Solution
A driver assistance system with an error handling unit that maintains vehicle guidance with restricted functions in failure scenarios, using information from multiple sub-sensors like front radar and optical systems, and escalates warning levels to prompt the driver to take over, while allowing for a limited time of automated control to ensure safe transition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the driver assistance system deactivates hands-free driving mode upon detection of any sensor failure, then system safety is maintained, but the transition from automated to manual control becomes unsafe and disruptive
Solution Approach 1:
The error handling is segmented into different levels based on failure severity. The system divides sensor failures into categories (single sub-sensor failure vs. multiple sub-sensor failures) and applies different response strategies to each segment, allowing safe continuation in less critical scenarios while maintaining safety in critical ones.
Solution Approach 2:
The system dynamically adjusts the hands-free driving mode status based on the current failure scenario. Instead of a static on/off response, the system transitions between different operational states (full functionality, restricted functionality, take-over request) depending on the severity and type of sensor failure detected.
2Productivity
If the driver assistance system maintains full vehicle guidance functionality during sensor failures, then driving continuity is improved, but safety is compromised
Solution Approach 1:
The system applies different quality levels to different guidance functions based on sensor availability. When sensors fail, the system restricts certain functions (e.g., lane keeping) while maintaining others (e.g., longitudinal control), ensuring each function operates within its safe capability boundaries rather than uniformly disabling all functions.
Solution Approach 2:
The system takes partial action by maintaining restricted vehicle guidance functionality rather than complete functionality. This allows the system to continue providing useful assistance (partial action) while acknowledging the limitations imposed by sensor failures, avoiding both complete shutdown and unsafe full operation.
3Speed
If the driver assistance system immediately deactivates hands-free mode upon sensor failure, then safety response is prompt, but the driver is not given adequate time to react and take over control
Solution Approach 1:
The system performs preliminary action by issuing take-over requests to the driver before completely deactivating hands-free mode. This preliminary warning allows the driver to prepare for and execute the transition to manual control, reducing the time loss associated with sudden mode changes while maintaining safety through timely intervention.
Data Source
AI summary
A driver assistance system for motor vehicles. The system includes a vehicle surroundings sensor system (for detecting vehicle surroundings information which includes multiple sub-sensor systems, in a driving mode for hands-free driving, a vehicle guidance being carried out based on vehicle surroundings information detected by the vehicle surroundings sensor system, the vehicle guidance encompassing functions for the vehicle transverse guidance and for the vehicle longitudinal guidance. An error handling unit is configured, in the driving mode for hands-free driving, to maintain the vehicle guidance with different restrictions of functions of the vehicle guidance, and to output a vehicle guidance take-over request to a person driving the vehicle, in different failure scenarios of sub-sensor systems of the vehicle surroundings sensor system.