Vehicle Motion Control Device for Lateral Overturn Prevention
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Solution Overview
Problem
Existing vehicle motion control systems are inadequate in preventing lateral overturn, particularly for vehicles with high loading weights, as they fail to sufficiently suppress rolling and vibration during emergency maneuvers.
Innovation Solution
A vehicle motion control device that actively increases brake force at the front inside wheel to cause skidding, synchronized with the outside wheel, based on loading weight, steering angle, roll angle, and friction coefficient, to prevent lateral overturn by generating a suitable brake force for skidding and tilting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If brake force is increased at the outside wheel to prevent lateral overturn, then the vehicle stability improves, but the vehicle rolling and vibration increases
Solution Approach 1:
The patent applies local quality by differentiating brake force control between inside and outside wheels. Specifically, the brake force to the front inside wheel is increased to cause skidding, while the brake force to the outside wheel is controlled to prevent excessive rolling. This localized differentiation allows the system to achieve lateral overturn prevention without generating harmful rolling and vibration effects.
Solution Approach 2:
The patent inverts the conventional approach by actively causing the front inside wheel to skid rather than preventing skidding. This inversion is achieved by increasing brake force to the inside wheel until skidding occurs, which generates a lateral force that counteracts the overturning moment. This counterintuitive approach effectively prevents lateral overturn while the control system manages the resulting vehicle dynamics.
2Stability of the object's composition
If brake force is increased to cause skidding at the front inside wheel, then the lateral overturn prevention improves, but the brake force control complexity increases
Solution Approach 1:
The patent employs feedback mechanisms to manage brake force control complexity. The brake ECU continuously monitors vehicle state (including lateral acceleration, steering angle, and wheel speeds) and adjusts brake forces to the inside and outside wheels accordingly. This feedback loop enables automatic adaptation to changing conditions, preventing lateral overturn without requiring complex manual intervention or overly sophisticated control algorithms.
Solution Approach 2:
The patent utilizes parameter changes by adjusting brake force levels based on detected vehicle conditions. The system modifies brake pressure parameters dynamically - increasing force to the inside wheel to induce skidding when overturn risk is detected, and adjusting outside wheel force to maintain stability. These parameter adjustments are made through standard brake control mechanisms, keeping system complexity manageable.
3Stability of the object's composition
If duty cycles for W/C pressure boosting and depressurizing are suppressed, then the W/C pressure change is reduced, but the lateral overturn cannot be sufficiently prevented for vehicles with high loading weight
Solution Approach 1:
The patent applies local quality by implementing differentiated brake force control for inside and outside wheels rather than uniform pressure suppression. The system increases brake force to the front inside wheel to cause controlled skidding, while managing outside wheel brake force separately. This localized approach ensures effective lateral overturn prevention even for vehicles with high loading weight, overcoming the limitations of uniform duty cycle suppression.
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
Effectively suppresses vehicle rolling and vibration, and further prevents lateral overturn by causing the front inside wheel to skid with higher possibility, thereby enhancing stability and steerability.
Implementation Method 1
a brake force control means which performs anti-lateral overturn control for increasing a brake force to be generated at a front inside wheel of a vehicle in order to cause skidding at the front inside wheel
Data Source
AI summary
The vehicle motion control device performs anti-lateral overturn control for increasing a brake force to be generated at a front inside wheel of a vehicle in order to cause skidding at the front inside wheel when a condition for increasing a brake force to be generated at an outside wheel is satisfied, wherein the condition is that the vehicle motion control device is in the anti-lateral overturn mode and the vehicle is turning.