Adaptive Steering Torque Filtering for Driver Assistance
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Solution Overview
Problem
Existing driving assistance systems for motor vehicles can create an unpleasant experience for drivers when the corrective torque opposes the driver's torque, leading to a feeling of fighting against the system, especially when the vehicle deviates from the lane or approaches bends.
Innovation Solution
A method that filters the corrective torque to reduce its value when it opposes the driver's torque, cancels it when the deviation is minor, and adjusts the torque based on the lateral deviation and driver's input to avoid opposing the driver's steering, ensuring a harmonious and safe driving experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If corrective torque is exerted to maintain vehicle position in traffic lane, then vehicle lane maintenance is improved, but driver comfort deteriorates when torque opposes driver input
Solution Approach 1:
The system dynamically adjusts the corrective torque based on real-time detection of driver torque. When driver torque is detected, the corrective torque is reduced or canceled, making the assistance dynamic and adaptive rather than static, thereby resolving the contradiction between maintaining lane position and ensuring driver comfort
Solution Approach 2:
The system implements feedback by continuously monitoring the torque exerted by the driver on the steering wheel and using this information to modulate the corrective torque. This feedback mechanism allows the system to respond to driver intentions and adjust assistance accordingly, preventing the uncomfortable situation where corrective torque opposes driver input
2Ease of operation
If corrective torque is reduced when opposing driver torque, then driver comfort is improved, but vehicle position control precision deteriorates
Solution Approach 1:
The system applies partial corrective torque rather than full corrective torque when driver torque is detected. This partial action is sufficient to maintain vehicle position while being comfortable for the driver, avoiding the need for full corrective torque that would cause discomfort
Solution Approach 2:
The system changes the parameter of corrective torque magnitude based on detected driver input. By modulating the torque parameter dynamically - reducing it when driver torque is present and maintaining it when no driver torque is detected - the system achieves both driver comfort and adequate position control
Data Source
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AI summary
The invention relates to a driver assistance method for a motor vehicle moving in a traffic lane, during which a corrective torque (TC) to be applied to a steering member of the motor vehicle is determined (c), on the basis of a data item (yL) in relation to a position of the motor vehicle relative to the traffic lane, considering a torque (TA) applied by a driver of the motor vehicle to this steering member, so that the motor vehicle follows a target path. According to the invention, this method further comprises steps during which: d) a filtered corrective torque (TCF) is determined on the basis of said corrective torque, such that the value of this filtered corrective torque is systematically less than that of this corrective torque when said applied torque is substantially counter to said corrective torque, and e) said filtered corrective torque is applied to the steering member of the motor vehicle.