Semi-Active Stabilizer Bar Stiffness Control
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Solution Overview
Problem
Conventional stabilizer bars lack the ability to control stiffness effectively, leading to either excessive stiffness for safety on curved roads or insufficient stiffness for ride comfort on straight roads, and are costly and heavy, making them unsuitable for mid- or low-priced vehicles.
Innovation Solution
A semi-active anti-roll stabilizer bar design that varies stiffness based on torsional angle without the need for sensors or actuators, utilizing an outer and inner housing with elastic elements and rotational bearings to provide adjustable stiffness by compressing coil springs in stages, ensuring low stiffness on straight roads and high stiffness on curved roads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the stabilizer bar is designed with high stiffness to prevent turnover on curved roads, then safety is improved, but ride comfort deteriorates on straight roads
Solution Approach 1:
The stabilizer bar employs a dynamic stiffness control mechanism where the bar itself generates controlling force through its torsional deformation. The non-linear torsional characteristic of the stabilizer bar allows it to provide high stiffness when torsional angle exceeds a predetermined threshold (preventing turnover) while maintaining low stiffness within the threshold range (ensuring ride comfort). This eliminates the need for active actuators or sensors, achieving dynamic adaptation purely through mechanical design.
2Adaptability or versatility
If an active anti-roll stabilizer bar with actuators and sensors is used to control stiffness, then stiffness control capability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The stabilizer bar is designed to automatically control its own stiffness based on its torsional angle without requiring external sensors or actuators. The bar's inherent non-linear torsional characteristic causes it to naturally transition between low-stiffness and high-stiffness states based on the magnitude of torsional deformation, making the system self-regulating and eliminating complex control mechanisms.
Solution Approach 2:
The invention extracts and eliminates the unnecessary components (sensors, actuators, controllers) from the conventional active stabilizer bar system. By removing these complex elements and relying solely on the mechanical properties of the stabilizer bar itself, the system achieves stiffness control capability with significantly reduced complexity and lower manufacturing costs.
3Adaptability or versatility
If an active anti-roll stabilizer bar with actuators is used, then stiffness control is improved, but weight increases
Solution Approach 1:
The stabilizer bar achieves stiffness control through its own mechanical deformation characteristics without requiring additional actuators or sensors. The non-linear torsional property of the bar allows it to automatically adjust its stiffness based on the torsional angle, eliminating the need for heavy active components and reducing overall system weight.
4Ease of manufacture
If a single-piece stabilizer bar is manufactured, then manufacturing cost is reduced, but stiffness control capability is lost
Solution Approach 1:
The stabilizer bar incorporates a specific local structural feature - a non-linear torsional characteristic section - that enables stiffness control capability. This localized design feature allows the bar to transition between different stiffness states based on torsional angle while maintaining the simplicity of a largely single-piece construction, thus achieving stiffness control without significantly increasing manufacturing complexity or cost.
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 design enhances ride quality and safety by maintaining low stiffness on straight roads and increasing stiffness on curved roads, reducing manufacturing costs and weight, making it suitable for mid- or low-priced vehicles.
Implementation Method 1
at least one elastic element; When the outer housing and the inner housing are rotated relative to each other, the elastic element is elastically deformed thereby exerting elastic force
Data Source
AI summary
A semi-active anti-roll stabilizer bar capable of controlling the stiffness thereof by virtue of the elastic force of a spring is disclosed. When the stabilizer bar is rotated during general travelling, the stabilizer bar has roll stiffness attributable to the repulsive force due to the spring constant thereof. When the stabilizer bar is greatly rotated during turning of the vehicle, the springs are closely compressed, with the result that the stabilizer bar has the same high stiffness as that of a general stabilizer bar.