Vehicle Stability Envelope Control for Recoverable Drifting
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Solution Overview
Problem
Existing vehicle safety systems intervene too aggressively, limiting the vehicle's maneuverability and agility, especially in drifting maneuvers, by applying brakes to prevent loss of traction, without allowing the driver to fully utilize the vehicle's potential.
Innovation Solution
A system and method to determine a maximum phase recovery envelope (MPRE) that allows the vehicle to operate within a larger, recoverable state space by simulating critical points and vehicle parameters, enabling aggressive maneuvers while ensuring stability, using online adaptation to changing conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If existing vehicle safety systems apply brakes to prevent loss of traction, then vehicle stability is improved, but vehicle maneuverability and agility deteriorate
Solution Approach 1:
The system dynamically adjusts the stability intervention threshold based on vehicle state parameters (speed, steering angle, yaw rate). At high speeds, the system allows greater deviation from stable operation before intervening, while at lower speeds it maintains stricter stability control. This parameter adaptation enables aggressive maneuvers like drifting at high velocities while preventing unsafe conditions.
Solution Approach 2:
The safety system transitions from static brake application rules to dynamic, state-dependent intervention. The system continuously monitors phase plane coordinates (steering angle and yaw rate) and adjusts its intervention strategy in real-time, allowing the vehicle to operate in previously restricted states when conditions permit safe recovery.
2Reliability
If electronic stability control intervenes to reduce loss of traction, then vehicle safety is improved, but driver control and vehicle potential are limited
Solution Approach 1:
The system implements closed-loop feedback by continuously monitoring vehicle phase plane coordinates and comparing them against dynamically calculated safe operation boundaries. Intervention occurs only when trajectories approach critical thresholds, allowing drivers full control within the safe envelope while automatically preventing excursions into dangerous states.
Solution Approach 2:
The system performs preliminary calculations of the maximum phase recovery envelope based on current vehicle conditions (friction coefficient, velocity) before intervention is needed. This pre-computed safety boundary enables the system to permit aggressive maneuvers that are pre-determined to be recoverable, rather than relying solely on reactive brake application.
Data Source
AI summary
Systems and methods for determining a maximum phase recovery envelope are disclosed herein. In one example, a system includes a processor and a memory having a vehicle control module. The vehicle control module includes instructions that, when executed by the processor, cause the processor to determine a critical point on a phase plane indicating a maximum defined recovery point a vehicle can recover from, perform forward and reverse simulations from the critical point to define outermost contours of a maximum phase recovery envelope using parameters and state of the vehicle, and cause the vehicle to operate within the maximum phase recovery envelope.