Driver Assistance System for Split-Friction Braking Stability
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Solution Overview
Problem
During split-friction braking events, vehicles experience unwanted yaw torque due to asymmetric brake forces, leading to instability and increased stopping distance, as existing technologies like EP1209053 only provide limited assistance by adjusting steering, without fully considering driver reaction and alertness.
Innovation Solution
A driver assistance system that adjusts brake pressure based on real-time differences in road friction and driver reaction levels, including alertness, to optimize stopping distance and stability, by continuously monitoring and responding to driver input and road conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If brake force is reduced to limit yaw torque, then vehicle stability is improved, but stopping distance increases
Solution Approach 1:
The system continuously monitors driver steering input and vehicle yaw rate, using this feedback to dynamically adjust brake pressure. When the driver actively counteracts yaw torque through steering input, the system increases brake pressure to shorten stopping distance. When driver input is insufficient, the system reduces brake pressure to maintain stability, thus resolving the contradiction between stability and stopping distance through real-time feedback control
Solution Approach 2:
The brake pressure is made dynamic rather than static, continuously adapting based on driver reaction level and vehicle conditions. The system transitions between different brake pressure levels depending on whether the driver is actively compensating for yaw torque, allowing the system to optimize both stability and stopping distance under varying operational conditions
2Loss of time
If automated braking function is implemented, then stopping distance is reduced, but driver situation awareness deteriorates
Solution Approach 1:
The system monitors the driver's own steering input and uses this information to determine when to apply enhanced brake pressure. The driver's natural compensatory steering actions during split-mu events serve as the trigger for the automated braking assistance, allowing the system to act autonomously while being activated by the driver's own situational responses
Solution Approach 2:
The system replaces the need for the driver to consciously monitor and adjust brake pressure with an automated control system that senses driver steering input and automatically modulates brake pressure accordingly, substituting mechanical driver action with automated electronic control while preserving driver intent
Data Source
AI summary
A method for controlling a driver assistance system is provided, as is a corresponding driver assistance system and a computer program product.