Active Roll Control System Using Variable Lever Ratio
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Solution Overview
Problem
Conventional active roll control systems face limitations in securing turning stability due to constant roll rigidity and require complex hydraulic pressure systems, which can compromise productivity and layout efficiency.
Innovation Solution
An active roll control system that adjusts the mounting position of a stabilizer link on a suspension arm using a drive motor and roller bearings, changing the lever ratio of the stabilizer link to actively control roll rigidity based on driving conditions, thereby enhancing turning stability and simplifying control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a hydraulic pressure cylinder is used as an actuator to control roll actively, then roll rigidity can be changed, but the system requires complex hydraulic pressure components (pumps, lines, valves) which deteriorates productivity and increases device complexity
Solution Approach 1:
The patent replaces the hydraulic pressure system with a direct mechanical actuation system. The actuator directly adjusts the connecting length between the stabilizer bar end and the lower arm through mechanical means, eliminating the need for hydraulic pressure pumps, lines, and valves, thereby simplifying the overall system while maintaining roll rigidity control capability
Solution Approach 2:
The patent extracts and removes the complex hydraulic pressure components (pumps, pressure lines, valves) from the system, retaining only the essential mechanical actuation mechanism needed to adjust the stabilizer link connecting length, thus reducing device complexity while preserving the core functionality
2Ease of operation
If the lower end of the hydraulic pressure cylinder is assembled through a separate bracket to secure maximum operation stroke, then actuator stroke is maximized, but productivity is deteriorated due to complex assembly
Solution Approach 1:
The patent merges the actuator mounting function directly into the lower arm structure, eliminating the need for a separate bracket. The actuator is assembled directly to the lower arm at a position that provides sufficient operation stroke, thereby simplifying the assembly process and improving productivity while maintaining adequate actuator stroke
3Ease of manufacture
If a conventional stabilizer bar with constant roll rigidity is used, then the structure is simple, but turning stability cannot be secured under various driving conditions
Solution Approach 1:
The patent introduces a mechanical actuator that dynamically adjusts the connecting length between the stabilizer bar end and the lower arm based on driving conditions. This dynamic adjustment capability allows the stabilizer bar to provide appropriate roll rigidity control under various driving conditions while maintaining a relatively simple structural design
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 effectively improves turning stability by dynamically adjusting roll rigidity and simplifies control by eliminating the need for complex hydraulic systems, while minimizing offset and torsional moment effects, resulting in a more efficient and compact layout.
Implementation Method 1
a connector (9) having a screw hole formed at a center portion thereof and a connecting end formed at one side surface thereof and connected to an end of the stabilizer link (3), upper and lower portions of which are mounted on the rail plate (7) so as to be movable along the rail plate (7)
Implementation Method 2
a drive motor (11) coupled to an inboard end of the suspension arm (5) and provided with a rotation shaft that is a screw shaft (27), the rotation shaft being engaged to the screw hole (SH) such that the connector (9) is movable along the rail plate (7)
Implementation Method 3
in a case that left and right wheels 111 move to the opposite direction (one moves upwardly and the other moves downwardly), the stabilizer bar 105 is twisted and suppresses the roll of the vehicle body 107 by torsional restoring force
Implementation Method 4
the stabilizer bar 105 is twisted and stabilizes position of the vehicle body by torsional restoring force
Data Source
AI summary
An active roll control system (ARCS) can actively control roll of a stabilizer bar connected to a pair of upper arms mounted respectively at both sides of a vehicle body through stabilizer links. The system may include a rail plate mounted in a space formed by bending a middle portion of the suspension arm, a connector having a screw hole and a connecting end that is connected to the stabilizer link, upper and lower portions of the connector being movable along the rail plate, a drive motor coupled to the suspension arm and provided with a screw shaft, wherein the connector is movable along the rail plate, and a cover covering the space in a state of being coupled with the rail plate and having a slot formed at a lower surface thereof, wherein the stabilizer link being inserted in and movable along the slot.