Frequency-Selective Vibration Damper With Bypass Control Valve
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Solution Overview
Problem
Existing vibration dampers face challenges with insufficient volume flow at low damper speeds, lack of closed-loop control for bypass flow, and a non-compact design, particularly in low-frequency excitations with small amplitudes.
Innovation Solution
A frequency-selective vibration damper with a bypass control valve system, featuring a damper tube filled with damping fluid, a movable piston rod, and a damping module that includes a control piston and disk valve assembly. The control piston allows for independent control of the bypass flow, enabling parallel fluid flow through the comfort and bypass paths, and is decoupled from the working piston for improved response times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a disk valve assembly is arranged in the main flow, then the damping force can be controlled, but at low damper speeds the volume flow is insufficient to open the valve
Solution Approach 1:
A bypass control valve is introduced as an intermediary element that allows damping fluid to flow through a bypass path in parallel to the main flow path. This bypass path is equipped with its own valve assembly that can be independently controlled, enabling the system to maintain effective damping force even when the main flow volume is insufficient to open the primary disk valve at low speeds.
2Device complexity
If no bypass control is provided, then the design is simpler, but closed-loop control of bypass flow is not possible
Solution Approach 1:
The bypass control valve is equipped with a valve disk assembly that includes a bypass control valve, enabling closed-loop control of the bypass flow. This feedback mechanism allows the system to monitor and adjust the bypass flow dynamically, improving adaptability to different operating conditions while maintaining a relatively compact design through integrated valve assemblies.
3Device complexity
If the control piston is mechanically coupled to the working piston, then the structure is simpler, but response times are increased
Solution Approach 1:
The control piston is mechanically decoupled from the working piston, creating independent control segments. This segmentation allows the bypass control valve to respond independently to control signals without being mechanically constrained by the working piston's motion, significantly reducing response time particularly for low-frequency excitations with small amplitudes.
4Volume of moving object
If a fixed bypass path is used, then the design is more compact, but independent closed-loop control of bypass flow is not possible
Solution Approach 1:
The bypass path is designed with a controllable valve assembly that transitions the fixed bypass path into a dynamic, adjustable flow path. The bypass control valve can modulate the bypass flow independently based on control signals, enabling closed-loop control while maintaining a compact integrated design within the damper structure.
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 solution provides short response times without comfort losses, even at low-frequency excitations, and allows for a compact design, enabling effective damping with improved driving characteristics.
Implementation Method 1
a bypass control valve, via which, bypassing the comfort valve, damping fluid can be caused to flow via a bypass control path hydraulically in parallel with respect to the flow through the working piston (4), wherein the bypass control valve is controlled by means of the stroke of the control piston (8)
Implementation Method 2
The control arrangement comprises a control piston, wherein the stroke of the control piston imparts a preload via a spring element to a spring washer valve in the main flow
Implementation Method 3
a frequency-selective vibration damper for motor vehicles... enabling effective damping with improved driving characteristics
Data Source
AI summary
A damper tube which is at least partially filled with damping fluid and in which a piston rod is movable back and forth, wherein a working piston is movable jointly with the piston rod, by means of which working piston the interior space of the damper tube is divided into a piston-rod-side working space and a piston-rod-remote working space. A damping module for the frequency-dependent control of a comfort bypass is formed between the piston-rod-side working space and the piston-rod-remote working space and which comprises a comfort path via which damping fluid can be caused to flow hydraulically in parallel with respect to the flow through the working piston.