Active Roll Control via Wire Tension and Pulley Mechanism
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Solution Overview
Problem
Conventional active roll control systems for vehicles face challenges in quickly and precisely controlling vehicle roll due to their complex hydraulic pressure systems and the need for additional brackets, which complicate assembly and reduce mass productivity.
Innovation Solution
An active roll control system that changes the torsional rigidity of a stabilizer bar by adjusting the tension of a wire using a pulley unit operated by an electric motor, simplifying the control and layout by eliminating the need for hydraulic pressure systems and additional brackets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hydraulic pressure cylinder is used to control the stabilizer bar, then active roll control is achieved, but the system complexity increases due to hydraulic pressure supply systems
Solution Approach 1:
The patent replaces the hydraulic pressure cylinder system with a mechanical linkage system consisting of a control link connected to the stabilizer bar and a pulley mechanism. This substitution eliminates the complex hydraulic pressure supply system while maintaining the active roll control function through pure mechanical means.
Solution Approach 2:
The patent extracts and removes the hydraulic pressure supply system components (hydraulic pump, hydraulic lines, control valves) from the active roll control system, retaining only the essential mechanical linkage components needed to achieve roll control.
2Reliability
If additional brackets are installed on the lower arm to guarantee operational stroke, then the hydraulic pressure cylinder can be assembled, but mass productivity is reduced
Solution Approach 1:
The patent uses a pulley mechanism that allows the control link to achieve the necessary operational stroke through rotational movement of the pulley, eliminating the need for additional brackets on the lower arm. This dynamic pulley mechanism provides the required range of motion while maintaining a clean, bracket-free lower arm design that is easier to manufacture.
3Reliability
If a hydraulic pressure cylinder is used, then active roll control is achieved, but the control system becomes complex requiring ECU control of hydraulic pressure system
Solution Approach 1:
The patent replaces the electronically-controlled hydraulic pressure system with a purely mechanical control linkage system. The control link is directly connected to the stabilizer bar through a pulley mechanism, allowing mechanical transmission of control forces without requiring ECU control of hydraulic pressure.
4Device complexity
If conventional stabilizer bar is used, then simple structure is maintained, but roll control is slow and imprecise
Solution Approach 1:
The patent introduces a control link with pulley mechanism that enables dynamic adjustment of the stabilizer bar position and tension. This allows the stabilizer bar to respond more quickly and precisely to roll conditions while maintaining a relatively simple overall 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
This solution allows for precise and efficient active roll control of vehicles by changing the torsional rigidity of the stabilizer bar, simplifying the control mechanism and reducing the complexity of the system layout, thereby improving vehicle stability and ride comfort without the drawbacks of hydraulic pressure systems.
Implementation Method 1
controlling rotation of a wire pulley by using torque of a driven device connected to the wire pulley
Implementation Method 2
a driving device engaged with the driven device and operated by an actuator
Data Source
AI summary
An active roll control system actively controls roll of a vehicle by changing torsional rigidity of a stabilizer bar by using change in tension of a wire connected to the stabilizer bar and both lower arms according to an operation of a pulley unit mounted at the lower arm, simplifies control thereof as a consequence that an electric motor controls operation of the pulley unit, and simplifies layout thereof.