Active Roll Control Stabilizer Bar Lever Ratio Adjustment
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Solution Overview
Problem
Existing active roll control systems for vehicles struggle to maintain stability during high-speed turns due to limited spring characteristics of stabilizer bars, which either compromise riding comfort or fail to actively control roll motions effectively.
Innovation Solution
An active roll control system that incorporates a roll control mechanism with a lever ratio adjustment mechanism, utilizing a screw shaft and actuator controlled by an ECU, to increase the spring characteristic of the stabilizer bar during high-speed turns, enhancing roll stiffness and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the spring characteristics of the stabilizer bar are increased to suppress rolling, then turning stability is improved, but riding comfort is reduced
Solution Approach 1:
The stabilizer bar's spring characteristic is made dynamically adjustable through an actuator mechanism that can change the lever ratio between the stabilizer link and control arm. The ECU controls the actuator to adjust the stabilizer bar's effectiveness based on vehicle speed and steering angle, providing high roll stiffness during high-speed turns while maintaining normal comfort during straight travel or low-speed maneuvers.
Solution Approach 2:
The system changes the physical parameter of the stabilizer bar's lever ratio dynamically. By adjusting the position of the stabilizer link connection point on the control arm, the system modifies the mechanical advantage and spring characteristic of the stabilizer bar, enabling transition between soft (comfort-oriented) and stiff (stability-oriented) modes.
2Ease of operation
If the spring characteristics of the stabilizer bar are kept small to maintain riding comfort, then comfort is improved, but turning stability is reduced
Solution Approach 1:
The system dynamically adjusts the stabilizer bar's lever ratio based on real-time driving conditions. During straight travel or low-speed maneuvers, the actuator positions the stabilizer link to provide minimal roll stiffness for comfort. When high-speed turning is detected by the ECU, the actuator adjusts the link position to increase the lever ratio and roll stiffness, thereby improving turning stability.
Solution Approach 2:
The ECU monitors vehicle speed and steering angle to determine when adjustment is needed, dynamically changing the stabilizer bar's effective spring characteristic by repositioning the stabilizer link connection point on the control arm through the actuator mechanism.
3Device complexity
If a fixed stabilizer bar configuration is used, then device complexity is reduced, but adaptability to various traveling conditions is limited
Solution Approach 1:
The suspension system incorporates a dynamic adjustment mechanism that allows the stabilizer bar's lever ratio to change based on driving conditions. The actuator, controlled by the ECU, repositions the stabilizer link connection point on the control arm, enabling the system to adapt to different vehicle speeds and steering angles while maintaining a relatively simple base structure.
Solution Approach 2:
The stabilizer bar system serves multiple functions through a single adjustable component. The same stabilizer bar provides both comfort-oriented soft support during straight travel and stability-oriented stiff support during high-speed turns, eliminating the need for separate suspension systems for different driving conditions.
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 improves turning stability by dynamically increasing the spring characteristic of the stabilizer bar during high-speed turns, reducing roll angle and enhancing vehicle stability while maintaining comfort during straight travel.
Implementation Method 1
a screw shaft rotatably disposed in the space of the upper and lower cases and combined with the slider in a ball screw type
Data Source
AI summary
A roll control system improves stability in turning by actively controlling roll stiffness in accordance with traveling conditions of a vehicle. The active roll control system for a vehicle suspension includes a stabilizer bar of which the middle straight portion is fixed to a sub-frame by a mount bush and both ends are connected with a lower control arm by a stabilizer link to suppress roll of the vehicle body, in which a roll control mechanism is disposed between a lower end connecting portion of the stabilizer link and the lower control arm to increase roll stiffness by increasing a lever ratio of the stabilizer bar, if needed.