Vehicle Stability Control Hierarchy for AWD Torque Management
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Solution Overview
Problem
Vehicles, particularly those with all-wheel drive systems, experience instability during steering due to axle torque, leading to understeering or oversteering issues, which existing technologies fail to adequately address.
Innovation Solution
A method and system that utilize a control hierarchy to prioritize controlling body motion and wheel slip before standard stability, employing actuators such as electric motors, electronic limited slip differentials, and active aerodynamic assemblies to manage torque distribution and wheel behavior, ensuring stability and handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If standard stability control systems are used to address understeering and oversteering, then vehicle stability is improved, but energy consumption increases due to energy-intensive interventions
Solution Approach 1:
The control system is segmented into three hierarchical levels: body motion control (highest priority), wheel slip control (secondary priority), and standard stability control (lowest priority). This segmentation allows the system to address stability issues at the most efficient level first, reducing unnecessary energy consumption from lower-priority interventions.
Solution Approach 2:
The system performs preliminary control actions at the body motion and wheel slip levels before resorting to standard stability control. By addressing potential stability issues early through targeted body motion and wheel slip control, the system prevents the need for more energy-intensive standard stability interventions.
2Stability of the object's composition
If a comprehensive control system addressing both body motion and wheel slip is implemented, then vehicle stability and handling are improved, but device complexity increases
Solution Approach 1:
The control system dynamically adjusts its behavior based on real-time vehicle conditions, prioritizing body motion control when stability issues are detected and escalating to wheel slip control or standard stability control only when necessary. This dynamic approach maintains simplicity by activating complex controls only when needed.
Solution Approach 2:
The controller acts as an intermediary that coordinates between body motion control systems and wheel slip control systems, managing their interaction through a hierarchical structure. This intermediary role organizes the complex interactions between different control systems, making the overall system more manageable despite its comprehensive nature.
3Power
If axle torque is applied during steering, then vehicle propulsion is improved, but understeering and oversteering occur causing instability
Solution Approach 1:
The system continuously monitors vehicle behavior during steering and propulsion, detecting signs of understeering or oversteering. When such conditions are detected, the controller provides feedback to adjust body motion and wheel slip control, maintaining both propulsion effectiveness and stability by correcting torque distribution in real-time.
Solution Approach 2:
The system applies preliminary anti-actions to prevent understeering and oversteering before they fully develop. By monitoring vehicle dynamics during steering and propulsion, the controller can counteract developing instability through body motion and wheel slip control, preventing the harmful effects of axle torque-induced steering issues.
Data Source
AI summary
A method of controlling stability of a vehicle and a stability control system for the vehicle. A driver command is determined based on driver input data. At least one output command is sent to one or more vehicle systems to control stability of the vehicle based on the driver command. A controller sends the output command based on a control hierarchy that provides an order in which the controller controls body motion of the vehicle, wheel slip of the vehicle, and standard stability of the vehicle to control stability of the vehicle. The order dictates that the controller controls the body motion of the vehicle and the wheel slip of the vehicle before the controller controls the standard stability of the vehicle. A state of one or more of the vehicle systems is controlled based on the sent output command as dictated via the control hierarchy.