Steer-By-Wire Torque Vectoring for Vehicle Rollover Prevention
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Solution Overview
Problem
Existing steer-by-wire steering systems and rollover stabilization methods fail to effectively prevent motor vehicle rollovers during strong lateral load changes, as they either lead to vehicle slipping or reduced speed due to braking, which can result in unstable driving situations.
Innovation Solution
A method and steer-by-wire steering system that detects critical lateral load changes and applies maximum drive torque to the loaded wheel to induce slip, turning it in the direction of travel to prevent rollovers, while maintaining control through an automatic steering state for a limited time to stabilize the vehicle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If braking is applied to the outside front wheel to reduce lateral force and prevent rollover, then rollover risk is reduced, but vehicle speed is reduced and understeer occurs causing the vehicle to slide out of the curve
Solution Approach 1:
Instead of braking the loaded outside wheel to reduce lateral force, the patent applies drive torque to the unloaded inside wheel. This inverts the conventional approach by using the opposite wheel's drive force to create a counteracting yaw moment that prevents rollover while maintaining vehicle speed and curve stability.
Solution Approach 2:
The patent converts the harmful effect of lateral load transfer into a beneficial control mechanism. By detecting the critical lateral acceleration and applying drive torque to the inside wheel, the system uses the load transfer itself to identify which wheel needs intervention, transforming the rollover risk into a controlled situation where the inside wheel's drive force stabilizes the vehicle.
2Stability of the object's composition
If braking is applied to the outside front wheel to create yaw moment counteracting vehicle steering, then lateral acceleration is reduced, but vehicle understeers and slides out of the curve
Solution Approach 1:
The patent inverts the control approach by applying drive torque to the inside wheel rather than braking the outside wheel. This generates a yaw moment in the opposite direction that counteracts excessive lateral acceleration while preserving the vehicle's ability to follow the curve, eliminating understeer behavior.
Solution Approach 2:
The system changes the control parameter from braking force to drive torque. By applying drive torque to the inside wheel instead of braking the outside wheel, the patent alters the physical state of wheel-surface interaction, maintaining tire adhesion and curve following ability while achieving lateral acceleration control.
3Force
If drive torque is applied to the wheel loaded by lateral load change to induce slip, then the wheel slips and reduces lateral force, but this may create unstable driving situations
Solution Approach 1:
The patent applies drive torque to the inside wheel (unloaded wheel) rather than the outside wheel (loaded wheel). This inversion ensures that the driven wheel maintains road contact and adhesion, preventing slip-induced instability while still reducing overall lateral force through the creation of a stabilizing yaw moment.
Solution Approach 2:
The system continuously monitors lateral acceleration and wheel slip conditions. By detecting when critical lateral acceleration occurs and applying drive torque only to the inside wheel, the patent uses feedback control to maintain driving stability while achieving the desired lateral force reduction effect.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively prevents rollovers by allowing the vehicle to slide without tipping over, reducing lateral forces, and enabling quick transition back to manual steering once the critical state passes, thus maintaining stability and control.
Implementation Method 1
applying a drive torque by an individual wheel drive to the wheel loaded by the lateral load change in such a way that the wheel loaded by the lateral load change is caused to slip
Data Source
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AI summary
The invention relates to a method for preventing roll-over in the event of transverse load change of a motor vehicle, wherein the motor vehicle has an single-wheel drive which is designed to drive the wheel (70, 71) affected by the transverse load change independently of the at least one other wheel (70, 71) of the motor vehicle, said method comprising the following method steps: detecting a critical state of the motor vehicle in the event of transverse load change; applying a drive torque (TAntrieb) to the wheel (70, 71) of the motor vehicle affected by the transverse load change via the single-wheel drive (150, 151) in such a way that the wheel (70, 71) affected by the transverse load change is caused to slip; and steering the wheel (70, 71) of the motor vehicle affected by the transverse load change in the direction of travel (x) in such a way that a roll-over of the motor vehicle can be prevented.