Active Suspension Torque Control for Understeer Compensation
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Solution Overview
Problem
Current vehicle handling dynamics control systems fail to effectively compensate for understeer or oversteer conditions, leading to unstable vehicle behavior during cornering, which can result in accidents.
Innovation Solution
A method using fully active suspension (FAS) to determine and generate compensation torque by shifting tire loads between tires, adjusting suspension stiffness, and anticipating driving conditions to maintain desired vehicle motion and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional suspension systems are used, then device complexity is low, but vehicle handling dynamics control and stability during cornering deteriorate
Solution Approach 1:
The suspension system transitions from a passive, fixed configuration to an active, dynamically adjustable system. The fully active suspension (FAS) continuously modifies suspension characteristics in real-time based on detected vehicle conditions (understeer/oversteer), enabling the system to adapt handling dynamics actively rather than relying on fixed geometric design
Solution Approach 2:
The system changes physical parameters of the suspension (stiffness, damping characteristics) dynamically through active control. By adjusting suspension parameters in response to detected handling conditions, the system can compensate for understeer and oversteer, transforming the suspension from a static component to a controllable actuator for handling dynamics
2Stability of the object's composition
If fully active suspension is implemented to compensate for understeer/oversteer, then vehicle stability and handling improve, but device complexity increases
Solution Approach 1:
The system implements closed-loop feedback control by continuously monitoring vehicle handling dynamics (detecting understeer/oversteer conditions) and using this information to adjust suspension characteristics. This feedback mechanism enables automatic compensation for handling instability, maintaining vehicle stability through real-time adaptation
Solution Approach 2:
The fully active suspension system performs self-adjustment to correct handling dynamics without requiring external intervention. The system autonomously detects handling conditions, determines appropriate compensation actions, and executes suspension adjustments independently, making the vehicle self-correcting for stability issues
3Productivity
If tire loads are shifted dynamically to generate compensation torque, then cornering performance improves, but control complexity increases
Solution Approach 1:
The control system segments the vehicle into independent controllable units (individual wheels or axle groups), allowing independent manipulation of tire loads on different sides of the vehicle. This segmentation enables precise control of load transfer to generate compensation torque for correcting understeer/oversteer
Solution Approach 2:
The system adds a new control dimension by utilizing vertical load transfer (z-axis) to influence lateral handling dynamics (x-y plane). By shifting tire loads vertically and laterally through active suspension, the system generates compensation torque that directly affects cornering performance, adding a new degree of freedom to handling control
Data Source
AI summary
Arrangements (e.g., method, apparatus, computer-readable non-transitory media embodying a program) for compensating for understeer or oversteer behavior in a vehicle having a fully active suspension, including: determining whether an understeer or oversteer condition exists; determining a compensation torque needed to correct the understeer or oversteer condition; and generating the compensation torque by using the fully active suspension to shift tire loads between tires.