Hydraulic Suspension Anti-Roll System with Flow Restriction
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Solution Overview
Problem
Hydraulic suspension systems for vehicles, particularly articulated haulers, face challenges in balancing anti-roll functionality with the prevention of lateral vibrations, as existing cross-coupled hydraulic anti-roll bars tend to increase sideways rolling and lateral vibrations during certain driving conditions.
Innovation Solution
The system incorporates a hydraulic suspension system with at least two hydraulic cylinders and four accumulators, featuring fluid communication paths with reduced cross-sectional areas at specific points, utilizing flow restriction elements to manage fluid flow rates and dampen cross-coupling between cylinders during sudden events, while maintaining anti-roll functionality during non-sudden events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If cross-coupled hydraulic anti-roll bars are used to reduce body roll during fast cornering, then anti-roll functionality is improved, but lateral vibrations and sideways rolling increase when driving over obstacles
Solution Approach 1:
The system dynamically adapts the coupling between left and right suspension circuits by using a control unit that monitors wheel position and obstacle detection. When an obstacle is detected on one side, the control unit opens a valve to disconnect the cross-coupling, allowing independent suspension movement and reducing lateral vibrations. During normal cornering, the cross-coupling remains active to provide anti-roll functionality.
Solution Approach 2:
A control unit and valve system act as an intermediary between the cross-coupled hydraulic circuits. This intermediary can selectively connect or disconnect the fluid communication between left and right suspension circuits based on driving conditions, enabling the system to switch between anti-roll mode and vibration-reduction mode.
2Ease of operation
If hydraulic suspension cylinders are provided to each wheel for absorbing road irregularities, then travel comfort is improved, but body roll increases during fast cornering without anti-roll systems
Solution Approach 1:
The suspension system is segmented into independent left and right hydraulic circuits, each with its own suspension cylinders for absorbing road irregularities. The cross-coupling mechanism selectively connects these segmented circuits only when anti-roll functionality is needed, allowing each side to independently handle road irregularities for comfort while providing body roll control when required.
3Object-affected harmful factors
If the cross-sectional area of fluid communication paths is reduced to dampen cross-coupling during sudden events, then lateral vibrations are reduced, but anti-roll functionality may be compromised during non-sudden events
Solution Approach 1:
The system changes the flow resistance parameter in the fluid communication paths by using valves that can adjust or completely open the cross-coupling connection. During sudden events like obstacle detection, the valves open to reduce flow resistance and allow rapid fluid movement for vibration damping. During non-sudden cornering, the cross-coupling maintains appropriate flow characteristics for anti-roll functionality.
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
This configuration enhances vehicle stability by controlling fluid flow rates to reduce lateral vibrations and maintain effective anti-roll performance, providing improved comfort and handling during various driving conditions.
Implementation Method 1
at least four hydraulic accumulators, and at least a first and a second fluid communication path. The first chamber of said first hydraulic cylinder and the second chamber of said second hydraulic cylinder are in fluid communication with each other by means of said first fluid communication path
Implementation Method 2
The cross-connection then works as a hydraulic anti-roll bar. Such a hydraulic anti-roll bar functions works well for some driving conditions, while it has a tendency to increase the sideways rolling, or lateral vibrations
Implementation Method 3
the first fluid communication path has at a portion of the extension between the connection point to said first accumulator fluid communication path and the connection point to said second accumulator fluid communication path a cross-sectional area that is smaller than the smallest cross-sectional area
Data Source
AI summary
A hydraulic suspension system is provided for a vehicle, the system including at least a first hydraulic cylinder and a second hydraulic cylinder, each of the hydraulic cylinders including a first chamber and a second chamber, at least four hydraulic accumulators, and at least a first and a second fluid communication path. The first chamber of the first hydraulic cylinder, and the second chamber of the second hydraulic cylinder are in fluid communication with each other by means of the first fluid communication path, and the first chamber of the second hydraulic cylinder and the second chamber of the first hydraulic cylinder are in fluid communication with each other by means of the second fluid communication path, wherein a first hydraulic accumulator is in fluid communication with the first fluid communication path by means of a first accumulator fluid communication path and a second hydraulic accumulator is in fluid communication with the first fluid communication path by means of a second accumulator fluid communication path, wherein a connection point between the first accumulator fluid communication path and the first fluid communication path is distanced from a connection point between the second accumulator fluid communication path and the first fluid communication path, and wherein a third hydraulic accumulator is in fluid communication with the second fluid communication path by means of a third accumulator fluid communication path and a fourth hydraulic accumulator is in fluid communication with the second fluid communication path by means of a fourth accumulator fluid communication path, wherein a connection point between the third accumulator fluid communication path and the second fluid communication path is distanced from a connection point between the fourth accumulator fluid communication path and the second fluid communication path.