Vehicle Torque Vectoring Control for Side-Slope Stability
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Solution Overview
Problem
Current vehicle control systems lack the ability to dynamically adjust the turning moment based on driving conditions, leading to suboptimal handling and stability, especially on varying surfaces like grass, mud, and sand, where traditional systems fail to provide adequate steering assistance and torque distribution.
Innovation Solution
A control system that detects the driver's requested steering angle and adjusts the net turning moment in response to driving conditions, using a combination of torque vectoring and brake torque vectoring to enhance steering assistance, allowing for automatic mode selection or user-enabled/disabled steering assist functions, and optimizing subsystem configurations for different terrain modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional vehicle control systems are used without dynamic turning moment adjustment, then the system complexity is low, but vehicle handling and stability are suboptimal on varying surfaces
Solution Approach 1:
The control system dynamically adjusts the turning moment based on real-time driving conditions and detected steering angle. The system transitions from a static control approach to a dynamic one where control parameters are continuously modified according to surface conditions (grass, mud, sand, etc.), vehicle speed, and steering input, thereby improving handling and stability on varying surfaces.
Solution Approach 2:
The system incorporates feedback mechanisms by detecting the driver-requested steering angle and using this information along with driving condition signals to adjust the turning moment. This closed-loop control enables the system to respond to actual driving conditions and driver intent, improving vehicle behavior without requiring overly complex manual adjustments.
2Reliability
If the turning moment is adjusted in response to driver-requested steering angle based on driving conditions, then vehicle handling on low-friction surfaces is improved, but the control system complexity increases
Solution Approach 1:
The control system is designed to operate across multiple driving conditions and surface types (grass, gravel, snow, mud, ruts, sand, and paved surfaces) using a unified control architecture. The same control system handles various terrains by adjusting parameters based on detected conditions, avoiding the need for separate specialized systems for each surface type.
Solution Approach 2:
The system improves steering assistance on low-friction surfaces by dynamically changing control parameters such as the turning moment adjustment factor based on detected driving conditions. When low-friction surfaces are detected, the system modifies the relationship between steering angle and turning moment to provide appropriate steering feel and vehicle response, rather than using fixed parameters.
3Ease of operation
If automatic mode selection is implemented, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The control system automatically detects driving conditions and selects appropriate control modes without requiring manual intervention from the driver. The system monitors parameters such as wheel slip, vehicle speed, and steering angle to autonomously determine the current terrain type and adjust control parameters accordingly, freeing the driver from mode selection tasks.
Solution Approach 2:
The system performs preliminary analysis of driving conditions and proactively adjusts control parameters before the driver encounters handling issues. By continuously monitoring vehicle behavior and surface conditions, the system prepares and applies appropriate control adjustments in advance, improving responsiveness without requiring reactive manual mode changes.
Data Source
AI summary
Embodiments of the present invention provide a control system for a motor vehicle comprising: means for detecting a side-slope condition in which a vehicle is traversing a side-slope; and means for controlling an amount of torque applied to one or more wheels to induce a turning moment on a vehicle, the system being configured to cause a turning moment to be induced in a direction opposing side-slip of a trailing axle in a down-slope direction relative to a leading axle.