Vehicle Evasive Maneuver Stability Control via Differential Braking
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Solution Overview
Problem
Existing driver assistance systems for evasive maneuvers in vehicles often result in incorrect interventions, such as partial overlap collisions or vehicle instability, due to limitations in detecting slippery roads, overlooking obstacles, and reacting to high-speed dynamic steering inputs.
Innovation Solution
A method that uses environmental sensors and vehicle dynamics control systems to support and dampen driver steering during evasive maneuvers, generating additional yaw moments through braking interventions to achieve a safe lateral offset and stabilize the vehicle, while prioritizing steerability over braking distance in critical situations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If braking intervention is used to prevent collision, then collision risk is reduced, but braking distance increases on slippery roads leading to incorrect interventions
Solution Approach 1:
The system dynamically changes the coefficient of friction parameter based on detected driving conditions (wet road, icy road, loose gravel) to adjust distance calculations and braking intervention thresholds, ensuring accurate distance assessment across varying road surfaces
Solution Approach 2:
The system performs preliminary detection of road surface conditions and obstacle positions before initiating braking, using environment sensors to assess the situation in advance and calculate safe distances with adjusted friction coefficients, preventing incorrect late interventions
2Speed
If driver steers dynamically to avoid obstacle, then avoidance maneuver is achieved, but vehicle stability is compromised leading to skidding or tipping
Solution Approach 1:
The system applies preliminary counteracting braking forces to specific wheels before and during the steering maneuver to prevent excessive lateral acceleration and yaw rate, counteracting the destabilizing effect of dynamic steering while maintaining avoidance capability
Solution Approach 2:
The system continuously monitors lateral acceleration and yaw rate during the evasive maneuver, using this feedback to dynamically adjust braking forces on individual wheels to maintain vehicle stability throughout the maneuver
3Length of stationary object
If steering support is provided during evasive maneuver, then lateral offset is achieved, but excessive steering dynamics increase risk of tipping over
Solution Approach 1:
The system applies braking forces locally to specific wheels (front inside wheel or rear outside wheel) rather than uniformly, creating a targeted yaw moment that generates necessary lateral offset while minimizing overall vehicle dynamics and tipping risk
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
Minimizes the risk of collisions by enabling vehicles to achieve sufficient lateral offset and maintain stability during evasive maneuvers, reducing the risk of skidding and tipping over, especially at high speeds, and ensuring safe obstacle avoidance without excessive steering dynamics.
Implementation Method 1
electronically controlled braking system which enables a driver-independent build-up and modulation of the braking forces on the individual wheels of the vehicle
Data Source
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AI summary
Provided is a method in which the driving behaviour of a vehicle is influenced as a function of surroundings data in order to assist an avoidance manoeuvre when a collision risk is identified on the basis of the data from one or more surroundings sensors, in particular radar sensors and/or cameras, and the data from one or more vehicle sensors, in particular steering angle sensor and/or yaw rate sensor and/or wheel speed sensors, and the vehicle has an electronically regulated brake system which permits a driver-independent build-up and modulation of the brake forces at the individual wheels of the vehicle, wherein in the event of a collision risk being identified, in a first phase, a steering input by the driver is assisted, and/or in a second phase, a steering action by the driver is dampened. Also defined is an electronic control unit for a brake system.