Active Damping System for Two-Track Vehicle
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vehicle damping systems are limited in their ability to effectively dampen vibrations in the vehicle body and unsprung masses at frequencies above 5 Hertz, primarily due to the slow response time of hydraulic systems and the inability of passive dampers to introduce forces into the system.
Innovation Solution
An active damping system is developed for a two-track vehicle, incorporating a passive stabilizer and an electric motor-driven actuator that can introduce forces into the system, combined with hydraulic vibration dampers, allowing for targeted damping of vibrations up to 30 Hertz, and an advanced control system to manage these forces efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If hydraulic dampers are used to dampen vibrations, then damping effect is achieved, but response time is slow and frequency range is limited to below 5 Hertz
Solution Approach 1:
The system is divided into two independent but coordinated damping paths: a passive hydraulic damper for low-frequency body vibrations and an active electromechanical actuator for high-frequency unsprung mass vibrations. Each component operates in its optimal frequency range, resolving the contradiction by segmenting the damping function across different mechanisms rather than relying on a single hydraulic system.
Solution Approach 2:
The patent replaces the traditional hydraulic actuation system with an electromechanical actuator featuring a direct-drive motor and gear mechanism. This substitution eliminates hydraulic fluid dynamics limitations, enabling response frequencies up to 30 Hertz while reducing system complexity through integrated electromechanical design.
2Force
If passive stabilizers are used, then system simplicity is maintained, but ability to introduce forces into the system is lost
Solution Approach 1:
The system transitions from a static passive stabilizer to a dynamic active system where the electromechanical actuator can vary its stiffness and damping characteristics in real-time. The actuator dynamically adjusts the force it introduces based on detected vibration frequencies, enabling effective damping across both low and high frequency ranges while maintaining coordinated operation with the passive hydraulic damper.
3Adaptability or versatility
If hydraulic swivel motors are used for roll stabilization, then roll movement control is achieved, but frequency range is limited due to slow response time
Solution Approach 1:
The patent replaces hydraulic swivel motors with an electromechanical actuator system featuring a direct-drive motor and gear mechanism. This substitution leverages the faster response characteristics of electromagnetic actuation, expanding the operational frequency range to 30 Hertz while maintaining the roll stabilization function through coordinated control with the passive stabilizer.
4Speed
If active dampers are used to dampen vibrations up to 30 Hertz, then frequency range is expanded, but system complexity increases
Solution Approach 1:
The damping function is segmented into two frequency domains: the passive hydraulic damper handles low-frequency body vibrations (below 5 Hz), while the active electromechanical actuator handles high-frequency unsprung mass vibrations (up to 30 Hz). This segmentation allows each component to be optimized for its specific range, achieving broad frequency coverage without requiring the entire system to be overly complex.
Solution Approach 2:
The electromechanical actuator serves multiple functions: it acts as an active stabilizer for roll control, provides high-frequency vibration damping for unsprung masses, and coordinates with the passive hydraulic damper for low-frequency body vibration suppression. This multi-functionality reduces the need for separate dedicated components, thereby managing system complexity while achieving comprehensive vibration damping across the full frequency spectrum.
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 dampens vibrations in both the vehicle body and unsprung masses across a broader frequency range, ensuring effective energy recovery and minimizing energy consumption, while maintaining system safety and stability.
Implementation Method 1
An actuator (8) with an electric motor drive (11) is provided for each wheel suspension (6)
Implementation Method 2
This torsion bar is initially constructed like a (conventional) transverse stabilizer and consists of a torsion bar and two pivot arms
Implementation Method 3
An angled torsion bar with torsion spring properties extends into the actuator
Implementation Method 4
the known hydraulic vibration dampers, also called shock absorbers, are always used in the prior art
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention relates to a damping system (1) of a two-track vehicle (2), comprising a passive stabiliser (18) having a torsion bar (7) which runs in a vehicle transverse direction and having lever elements (3) which adjoin a torsion bar at the end sides and which are connected to mutually oppositely situated wheel suspension arrangements (6) of an axle of the vehicle (2), furthermore having two actuators (8) which are assigned to in each case one wheel (6a) of the wheel suspension arrangement and which are mounted on the vehicle body (16) and which have in each case one drive (11) by way of which a torque can be exerted on that section (7a) of the stabiliser (18) which faces toward the respective wheel (6a). Here, the actuators (8) are in the form of electric motors and are designed to dampen vertical vibrations of the respective wheel (6a) or of the so-called unsprung mass, and/or vibrations of the vehicle body (16) in a frequency range between 0 Hertz and at least 20 Hertz, through suitable regulation of the drive (11) of said actuators and thus also through active introduction of forces into the system.