Vehicle Lateral Sliding Control for Yaw-Free Emergency Avoidance
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Solution Overview
Problem
Existing vehicle safety systems, such as ABS and ESC, are inadequate in preventing collisions when obstacles are unavoidable, as they rely on traditional control approaches that avoid sliding and can induce instability during high-speed turns.
Innovation Solution
A control system that performs controlled lateral sliding by saturating the rear tires through brake-induced maneuvers, which are yaw-free and temporarily disable ABS and ESC to avoid interference, allowing the vehicle to maneuver around hazards without inducing yaw acceleration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional safety systems (ABS and ESC) are used to avoid sliding, then vehicle stability is improved under normal conditions, but the ability to perform emergency lateral maneuvers is hindered
Solution Approach 1:
The system dynamically switches between traditional stability control mode and emergency lateral maneuver mode based on detected hazard conditions. The control system transitions from preventing sliding under normal conditions to inducing controlled sliding during emergencies, making the vehicle's behavior adaptive to different operational contexts
Solution Approach 2:
The system changes the braking parameter state from moderate force (during normal ABS/ESC operation) to saturation-level braking force (during emergency maneuvers). By applying maximum braking force to rear wheels, the system intentionally induces tire sliding to achieve lateral movement, fundamentally changing the operational parameters of the braking system
2Speed
If direct steering is used to maneuver laterally around an obstacle, then the vehicle can avoid hazards, but rapid yaw rate increase causes instability
Solution Approach 1:
Instead of using steering input to achieve lateral movement (traditional approach), the system inverts the approach by using brake-induced sliding to create lateral motion. By applying brakes to rear wheels, the vehicle body slides laterally relative to the wheels, achieving lateral maneuvering through braking rather than steering
Solution Approach 2:
The system segments the vehicle's lateral control function into independent wheel-level brake control. By selectively applying brake force to individual rear wheels, the system creates asymmetric sliding that generates lateral movement while maintaining controlled yaw characteristics, separating the lateral motion generation from the steering system
3Adaptability or versatility
If brake saturation is applied to induce sliding, then lateral maneuvering capability is improved, but interference from ABS and ESC systems occurs
Solution Approach 1:
The system performs preliminary action by temporarily disabling ABS and ESC systems before initiating the emergency lateral maneuver. This pre-emptive disablement prevents these systems from interfering with the brake saturation process, ensuring that the intended sliding maneuver can execute without counteracting stability control interventions
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
This approach enhances the vehicle's stability and maneuverability in emergency situations by enabling effective avoidance of obstacles that would otherwise result in collisions, improving safety beyond standard ABS and ESC capabilities.
Implementation Method 1
lateral accelerations that are yaw-free for the vehicle... induce sliding in at least one rear wheel through a process of saturating an associated brake
Data Source
AI summary
Systems, methods, and other embodiments described herein relate to emergency lateral maneuvers using brake-induced tire sliding. In one embodiment, a method includes determining a vehicle state for a vehicle according to sensor data about a surrounding environment. The method includes computing, using the sensor data and the vehicle state, lateral accelerations that are yaw-free for the vehicle. The method includes, in response to detecting that the vehicle state is associated with an emergency event, selecting a maneuver from the lateral accelerations. The method includes controlling the vehicle according to the maneuver.