Hands-Free Driving Detection via Steering Torque Comparison
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Solution Overview
Problem
Current driving assistance systems in motor vehicles cannot effectively detect hands-free driving situations, leading to unintended autonomous steering which is not permitted by regulatory standards.
Innovation Solution
A method involving a theoretical steering system model and a comparison unit to generate and compare estimated and actual steering system signals, allowing the detection of hands-free driving states and adjusting the driving assistance system's steering corrections accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If driving assistance systems perform independent steering corrections, then lane keeping assistance is improved, but unauthorized autonomous steering occurs which violates regulatory standards
Solution Approach 1:
The system continuously monitors steering wheel torque signals and compares them against expected values to detect when the driver is not providing sufficient steering input. This feedback mechanism allows the system to identify hands-free driving situations and respond by deactivating autonomous steering corrections, thereby preventing unauthorized autonomous steering while maintaining lane keeping assistance when proper driver engagement is detected
Solution Approach 2:
A torque sensor acts as an intermediary between the driver's steering input and the driving assistance system's control actions. By measuring the torque applied to the steering wheel, the system can indirectly detect driver presence and engagement level without directly monitoring driver behavior, enabling it to mediate between the need for autonomous corrections and the requirement for driver oversight
2Reliability
If the driving assistance system continuously monitors steering input to detect hands-free situations, then regulatory compliance is improved, but system complexity increases
Solution Approach 1:
The existing steering wheel torque sensor, which is already part of the power steering system, is utilized to detect hands-free driving situations. The system repurposes existing hardware and data streams rather than adding dedicated monitoring sensors, allowing the steering system to serve dual functions: providing steering assistance and detecting driver engagement status
Solution Approach 2:
The torque sensor and steering system components perform multiple functions: they provide mechanical steering assistance through the power steering mechanism and simultaneously serve as detection sensors for monitoring driver engagement. This multi-functionality reduces the need for separate monitoring hardware and simplifies the overall system architecture while ensuring regulatory compliance
Data Source
AI summary
Embodiments of the inventive subject matter ensure that a hands-free driving situation of a motor vehicle can be detected. In the case of such detection of a hands-free driving situation, requirements of a driving assistance system are preferably reset with respect to steering corrections made by the driving assistance systems. In this manner, virtually independent steering of the vehicle such as, for example, and autopilot type of driving assistance functionality is therefore advantageously avoided.