Vehicle Torque Control for Side-Slope Stability
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Solution Overview
Problem
Conventional vehicle control systems fail to effectively manage side-slope conditions, leading to yaw and trailing axle slip issues, which can compromise vehicle stability and handling.
Innovation Solution
A control system that detects side-slope conditions and trailing axle slip angles, and proactively induces turning moments by adjusting torque distribution between wheels to counteract side-slip, using a combination of brake torque and powertrain drive torque to maintain stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional vehicle control systems are used on side-slopes, then the system structure remains simple, but trailing axle slip and yaw occur compromising vehicle stability
Solution Approach 1:
The control system proactively induces a first turning moment in response to detecting side-slope conditions, before trailing axle slip fully develops. This preliminary counteracting action prevents the slip from occurring in the first place, rather than merely responding after the problem arises
Solution Approach 2:
The control system continuously monitors trailing axle slip angles and dynamically adjusts torque distribution between wheels based on detected slip conditions. This closed-loop feedback mechanism ensures stability is maintained by constantly adapting to changing vehicle states
2Manufacturing precision
If torque distribution is adjusted to counteract side-slip, then trailing axle slip angle is reduced, but system complexity increases
Solution Approach 1:
The control system applies different torque levels to different wheels based on their individual slip conditions. Specifically, it increases torque to wheels experiencing slip while reducing torque to wheels with adequate traction, creating localized torque adjustments rather than uniform torque distribution
Solution Approach 2:
The system intentionally creates asymmetric torque distribution across the wheel set when side-slope conditions are detected. By applying different torque magnitudes to different wheels based on their individual slip angles and traction conditions, the system generates the turning moment needed to counteract side-slip
Data Source
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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.