Driver Assistance Steering Override via Torque Feedback
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Solution Overview
Problem
Driver assistance systems that influence the steering can cause unintended automatic steering, potentially leading to driver injury or loss of control, especially when the driver removes their hands from the wheel during operations like parking or lane-keeping assistance.
Innovation Solution
A method and device that determine and apply a driver-independent system steering variable to the steering wheel, allowing the system to deactivate based on the driver's steering input, ensuring the driver maintains control by recognizing and overriding automatic steering actions when the driver's input exceeds or contradicts the system's input, thereby preventing unintended vehicle steering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If the driver assistance system applies driver-independent steering moments to the steering wheel, then the system achieves automatic steering capability, but the driver may lose control and suffer injury when removing hands from the wheel
Solution Approach 1:
The system continuously monitors the driver steering variable (torque, steering angle, or angular velocity) and uses this feedback to determine whether to deactivate the driver assistance system. When the driver's steering input exceeds a threshold or contradicts the system's steering direction, the system deactivates automatically, preventing unintended steering while maintaining automation during normal operation.
Solution Approach 2:
The system dynamically adjusts its operational state based on real-time driver input conditions. The deactivation criteria involve comparing the driver steering variable against the system steering variable over a time interval, allowing the system to transition between active and deactivated states depending on whether the driver's actions align with or contradict the automated steering commands.
2Ease of operation
If the system deactivates when driver steering input exceeds a threshold, then driver control is maintained, but brief signal noise may cause false deactivation
Solution Approach 1:
The system requires that the driver steering variable exceed the threshold continuously over a predeterminable time interval before deactivation occurs. This preliminary condition filtering prevents brief signal noise or transient driver inputs from causing false deactivation, while still allowing sustained driver steering actions to override the system safely.
3Reliability
If the system requires continuous threshold exceedance over a time interval for deactivation, then false deactivation is prevented, but response time to genuine driver override increases
Solution Approach 1:
The system uses adjustable parameters including the threshold value for driver steering variable and the time interval duration. These parameters can be optimized to balance reliability and response time - a shorter time interval provides faster response to genuine driver override, while a longer interval provides better filtering of false signals. The specific parameter values can be tuned based on the application requirements.
Data Source
AI summary
In a method for deactivating a driver assistance system that influences the steering, a driver-independent system steering variable is applied to the steering wheel by the driver assistance system, the value of a driver steering variable applied to the steering wheel by the driver is determined, and the driver assistance system is deactivated dependent on the driver steering variable.