Active Chassis Control for Two-Track Vehicle Roll-Over Prevention
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Solution Overview
Problem
Existing off-road vehicles face limitations in robustly preventing static roll-over when stopping or driving on transversely inclined roads, as conventional methods like track width and center of gravity adjustments are insufficient and compete with other vehicle requirements.
Innovation Solution
A device for a two-track vehicle chassis with vertical dynamics actuators controlled by a unit, which detects tipping risks and actively lowers the vehicle's center of gravity and adjusts spring deflection to prevent roll-over, using both electromechanical and hydraulic actuators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional methods like track width and center of gravity adjustments are used for roll-over prevention, then structural stability is improved, but adaptability to different operating conditions deteriorates
Solution Approach 1:
The patent implements dynamic roll-over prevention by using active suspension actuators that continuously adjust suspension travel and wheel forces based on real-time operating conditions. The control system monitors vehicle state and dynamically modifies suspension characteristics, enabling the vehicle to adapt to varying speeds, terrains, and body positions rather than relying on fixed structural parameters.
Solution Approach 2:
The system changes physical parameters of the suspension system dynamically. The control unit adjusts suspension travel limits, spring forces, and damper characteristics based on detected operating conditions such as vehicle speed, body roll angle, and wheel position. This allows the same vehicle structure to exhibit different stability characteristics under different operating conditions.
2Adaptability or versatility
If active suspension control is implemented for roll-over prevention, then adaptability to operating conditions is improved, but device complexity increases
Solution Approach 1:
The control system is designed to perform multiple functions: it manages roll-over prevention, maintains ride height, controls body roll, and optimizes wheel contact with the ground. By integrating these functions into a single control unit that monitors common sensors, the system achieves multi-functionality without proportionally increasing complexity.
Solution Approach 2:
The control system automatically monitors vehicle conditions and adjusts suspension parameters without requiring manual intervention. Sensors continuously provide feedback on body position, wheel travel, and operating conditions, and the control unit autonomously determines the appropriate suspension response, making the system self-regulating and reducing operational complexity.
3Speed
If vertical dynamics actuators are used to lower center of gravity instantly, then roll-over prevention response time is improved, but energy consumption increases
Solution Approach 1:
The system applies active suspension forces periodically or intermittently based on detected roll conditions rather than continuously. The actuators engage when roll risk is detected and disengage when the vehicle returns to a stable position, creating a periodic action pattern that provides rapid response when needed while minimizing continuous energy consumption.
Solution Approach 2:
The suspension system dynamically adjusts its characteristics based on real-time conditions. During normal operation, the system uses passive suspension elements that require no energy. When roll risk is detected, the system dynamically activates active actuators to provide the necessary corrective forces, then returns to passive operation, optimizing the balance between response capability and energy usage.
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
Enables immediate and permanent stabilization against roll-over by actively managing tire forces and center of gravity, ensuring safe operation on inclined surfaces.
Implementation Method 1
each vehicle wheel HL, HR, VL, VR is assigned a suspension spring 3, which carries the static body weight of the vehicle
Implementation Method 2
the vertical dynamics control unit 21 actuates the vertical dynamics actuators 7 to avoid roll-over. This allows the vehicle center of gravity SP to be lowered suddenly. In addition, the roll angle can be reduced by increasing the spring deflection
Data Source
AI summary
A device for operating a chassis of a two-track vehicle, in which each vehicle wheel is assigned a suspension spring, which carries the static body weight of the vehicle, and a vertical dynamics actuator, which is actuatable by a vertical dynamics control unit, having a tipping detection function which detects a tipping situation with a roll-over risk in which there is a danger that the vehicle will tip sideways on a transversely inclined roadway. When a roll-over risk is detected, the vertical dynamics control unit actuates the vertical dynamics actuators to avoid roll-over.