Vehicle Stability Control via Dynamic Torque Allocation
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Solution Overview
Problem
Current vehicle stability control methods for front axis and rear axis distributed driven vehicles are inefficient in generating a yawing moment to maintain stability, often resulting in late and strong braking interventions, which degrade the driving experience.
Innovation Solution
A vehicle stability control method that calculates and adjusts the front-axis and rear-axis target slip ratios and torques in real-time based on the required yawing moment, using angular velocity errors and slip ratios to ensure accurate and quick stability control, thereby providing an additional yawing moment for maintaining lateral stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ESP braking intervention is used to generate yawing moment for vehicle stability control, then vehicle stability is improved, but the intervention is late and strong, degrading driver experience
Solution Approach 1:
The system performs preliminary stability control by adjusting torque distribution between front and rear axes before the vehicle enters an unstable state. The controller continuously monitors vehicle state and proactively adjusts torque allocation to prevent instability, rather than reacting after instability occurs. This preliminary action enables earlier intervention with milder torque adjustments instead of late strong braking, improving driver experience while maintaining stability.
2Device complexity
If torque allocation proportions of front and rear axes are fixed, then control system is simple, but control freedom and stability are limited
Solution Approach 1:
The system implements dynamic torque allocation where the torque distribution between front and rear axes changes continuously based on real-time vehicle state. The controller adjusts torque allocation proportions dynamically according to vehicle speed, steering angle, acceleration, and stability conditions. This dynamic adaptation provides high control freedom and versatility while maintaining manageable system complexity through model-based control strategies.
3Device complexity
If slip ratio control is not considered, then control method is simple, but additional yawing moment for stability cannot be provided
Solution Approach 1:
The system implements slip ratio feedback control where the actual slip ratio is continuously measured and compared with target slip ratio. The controller uses this feedback to adjust torque allocation and generate the required additional yawing moment. The feedback mechanism enables accurate slip ratio control that provides the necessary yawing moment for lateral stability while keeping the control method systematically manageable through closed-loop control.
Data Source
AI summary
A vehicle stability control method and a vehicle stability control device are provided. The method may be applied to an intelligent automobile field such as intelligent driving or autonomous driving, and is used to control lateral stability of a front axis and rear axis distributed driven vehicle. In this method, a yawing movement of the vehicle is considered, and an additional yawing moment for maintaining lateral stability of the vehicle is provided by compensating for front-axis and rear-axis slip ratios, to control lateral stability of the vehicle and therefore improve stability of the vehicle during driving.