Automated Lateral Guidance Deactivation via Dynamic Steering Torque
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Solution Overview
Problem
Current driving systems with automated lateral guidance require cumbersome manual steering interventions to deactivate the system, often distracting drivers and being prone to inadvertent deactivation, which is inefficient and uncomfortable.
Innovation Solution
A driving system with a hands-on detection device that distinguishes between intended and inadvertent steering interventions, reducing the necessary steering torque for deactivation and allowing for easier override of automated lateral guidance, and automatically reactivating it when conditions are met.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high steering torque threshold is required to deactivate automated lateral guidance, then inadvertent deactivation is prevented, but deactivation becomes laborious for the driver
Solution Approach 1:
The system dynamically adjusts the steering torque threshold based on the detected hand contact state. When both hands are detected on the steering wheel, the threshold is reduced to facilitate intentional deactivation, while when only one hand is detected, the higher threshold remains to prevent inadvertent deactivation. This dynamic adaptation resolves the contradiction by making the threshold context-dependent rather than fixed.
Solution Approach 2:
The patent changes the parameter of steering torque threshold based on the hand contact state parameter. The control unit modifies the deactivation threshold parameter from a high value (for safety) to a lower value (for ease of operation) when the condition of two-handed contact is detected, thereby resolving the contradiction between reliability and ease of operation.
2Ease of operation
If automated lateral guidance is deactivated by manual steering intervention, then system override is achieved, but driver distraction increases due to cumbersome operation
Solution Approach 1:
The system dynamically reduces the steering torque threshold when two-handed contact is detected, enabling faster and easier deactivation. This reduces the time and effort required for driver intervention, thereby minimizing driver distraction and resolving the contradiction between ease of operation and loss of time.
Solution Approach 2:
The hands-on detection device continuously monitors the steering wheel contact state in advance, preparing the system to rapidly respond when deactivation is intended. This preliminary detection allows the system to be ready for quick deactivation when needed, reducing the time loss associated with driver distraction.
3Ease of operation
If a simple steering contact triggers deactivation, then ease of override is improved, but inadvertent deactivation increases
Solution Approach 1:
The patent applies different deactivation thresholds to different local conditions of steering wheel contact. Instead of a uniform threshold, the system applies a high threshold for single-hand contact (preventing inadvertent deactivation) and a low threshold for two-hand contact (enabling easy intentional deactivation). This local differentiation resolves the contradiction between ease of operation and reliability.
Solution Approach 2:
The system changes the steering torque threshold parameter based on the contact state parameter. When the contact state changes from single-hand to two-hand contact, the threshold parameter is adjusted accordingly, allowing the system to differentiate between inadvertent and intentional deactivation attempts, thus resolving the contradiction.
Data Source
AI summary
A driving system for automated driving includes at least automated lateral guidance for a motor vehicle. The system is configured to determine whether one or more indications of a current or imminent manual steering intervention are present, which do not take place inadvertently and are intentional by a driver. Starting from a driving state with activated automated lateral guidance, the driving system deactivates the automated lateral guidance in response to the manual steering intervention. To deactivate the lateral guidance, a necessary steering torque operating counter to the activated lateral guidance is applied by the driver via the steering wheel within the scope of the manual steering intervention. When the at least one indication of the steering intervention intended by the driver is found to be present, the steering torque necessary to deactivate the lateral guidance is lower than when the indication of an intended steering intervention is not present.