Swerve Assist Steering Torque Amplification and Wheel Braking
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Solution Overview
Problem
Existing vehicle assistance systems fail to effectively support drivers in evasive maneuvers to avoid collisions, as they either intervene too late or incorrectly, and lack integration of criticality and driver intent in evasive maneuvers.
Innovation Solution
A method and device that detect evasive maneuvers by combining additional steering torque with individual wheel braking, amplifying the driver's steering movement and yaw motion to enhance lateral offset and avoid obstacles, while ensuring controllability and reducing the probability of incorrect interventions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If additional steering torque is applied to amplify driver's steering input during evasive maneuver, then lateral displacement speed is improved, but vehicle stability deteriorates
Solution Approach 1:
The braking intervention is segmented into individual wheel braking rather than uniform braking across all wheels. This allows selective application of braking force to specific wheels to generate controlled yaw moments that enhance lateral displacement while maintaining overall vehicle stability through differential brake force distribution.
Solution Approach 2:
The steering torque amplification and braking intervention are dynamically adjusted based on real-time detection of evasive maneuver conditions. The system continuously monitors steering angle, steering rate, and vehicle state to modulate the additional steering torque and braking force, ensuring stability is maintained while achieving rapid lateral displacement when needed.
2Speed
If individual wheel braking is applied to increase lateral displacement, then evasive maneuver effectiveness is improved, but risk of wheel lockup and loss of steerability worsens
Solution Approach 1:
Braking force is applied locally to specific wheels rather than uniformly to all wheels. The system selectively applies braking to individual wheels or combinations of wheels based on the detected evasive maneuver direction and magnitude, creating localized yaw moments that enhance lateral displacement while preserving steerability of unbraked wheels.
Solution Approach 2:
The braking intervention parameters (brake force magnitude, duration, and wheel selection) are continuously adjusted based on vehicle speed, steering input, and detected evasive maneuver characteristics. At lower speeds, braking force is reduced or avoided to maintain steerability, while at higher speeds where lateral displacement is more critical, braking is applied more aggressively within safe limits.
3Reliability
If steering intervention is applied when driver is minimally engaged, then collision avoidance is improved, but driver intent misinterpretation risk worsens
Solution Approach 1:
The system continuously monitors driver steering input, steering rate, and vehicle response to detect evasive maneuvers. By analyzing the feedback from the driver's steering actions and the vehicle's resulting motion, the system can distinguish between genuine evasive maneuvers requiring assistance and normal steering adjustments, reducing false interventions while maintaining collision avoidance capability.
Solution Approach 2:
The system prepares for potential evasive maneuvers by continuously monitoring driving conditions and pre-positioning assistance readiness. When an evasive maneuver is detected through analysis of steering input patterns and vehicle state, the system can quickly activate appropriate assistance levels based on the detected maneuver characteristics, ensuring timely intervention without requiring full driver engagement.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively supports drivers in evasive maneuvers by quickly achieving desired lateral offsets, reducing the risk of collisions, and maintaining vehicle steerability, with interventions tailored to vehicle speed and criticality, ensuring the system operates within controllability limits.
Implementation Method 1
an additional steering torque (3) is applied to amplify an existing steering torque
Implementation Method 2
Applying or activating individual wheel braking of the vehicle to further increase the lateral displacement or yaw motion of the vehicle generated by the (existing) steering torque and the additional steering torque
Data Source
Figure 1~4
Figure 5
Figure 6
AI summary
The swerve assist according to the invention shall assist the driver of a vehicle (10) during an avoidance manoeuvre so that a collision with an obstacle (1) is avoided. For this purpose, an additional steering torque (3) for amplifying a current steering torque is applied when an avoidance manoeuvre of the vehicle (10) has been detected. In addition, a single wheel braking (5; 6) of the vehicle (10) is actuated in order to increase a transverse offset of the vehicle (10).