Active Roll Control Apparatus with Variable Lever Ratio
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional active roll control apparatuses require high-capacity motors due to fixed lever ratios, leading to increased costs, size constraints, and instability issues in vehicle turning stability.
Innovation Solution
An active roll control apparatus that adjusts the connection position of a stabilizer link using a driving unit with rotating shafts, moving units, and a motor, allowing for variable lever ratios and flexible installation, thereby controlling the stiffness of the stabilizer bar to enhance turning stability without the need for high-capacity motors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional active roll control apparatuses use high-capacity motors to control stabilizer link lever ratio, then vehicle turning stability is improved, but motor size increases, costs increase, and installation becomes difficult
Solution Approach 1:
The patent changes the control parameter from direct motor-driven stabilizer link adjustment to pressure-controlled hydraulic cylinder adjustment. By controlling the pressure of master cylinder fluid rather than directly moving the stabilizer link, the system achieves roll control with a smaller motor while maintaining vehicle stability.
Solution Approach 2:
The patent replaces the direct mechanical connection between motor and stabilizer link with a hydraulic system. The motor drives a pump that controls fluid pressure, which then actuates the hydraulic cylinder to adjust the stabilizer link. This substitution allows using a smaller motor while achieving the same control effect.
2Adaptability or versatility
If conventional active roll control apparatuses increase motor capacity to adjust stabilizer link position, then roll stiffness control is improved, but installation space requirements increase and costs increase
Solution Approach 1:
The system controls roll stiffness by changing fluid pressure parameters rather than using a large motor to directly move the stabilizer link. The pressure control mechanism allows for compact installation while maintaining full adaptability in roll stiffness adjustment across different driving conditions.
Solution Approach 2:
The patent uses a hydraulic system where master cylinder fluid pressure controls the hydraulic cylinder that adjusts the stabilizer link position. This hydraulic approach enables compact motor size and reduced installation space while maintaining full roll stiffness control capability through pressure regulation.
3Reliability
If stabilizer bar stiffness is increased to improve turning stability, then vehicle stability is improved, but ride quality deteriorates due to constant stiffness
Solution Approach 1:
The patent implements dynamic stabilizer bar stiffness control through hydraulic pressure adjustment. The master cylinder fluid pressure can be varied in real-time based on driving conditions, allowing the system to provide high stiffness for stability during turning while reducing stiffness for comfort during normal riding, thus achieving both vehicle stability and ride quality.
Solution Approach 2:
The system changes the stiffness parameter dynamically by adjusting hydraulic pressure rather than using a fixed constant stiffness design. This allows the stabilizer bar to adapt its stiffness characteristic to different operating conditions, providing optimal performance for both stability and ride quality.
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 apparatus improves vehicle turning stability by dynamically adjusting the stabilizer bar's stiffness, reduces the need for large motors, and increases installation flexibility, saving costs and space while maintaining vehicle stability across varying speeds.
Implementation Method 1
The rotating shaft may be formed as a lead screw, and the moving unit may be formed as a nut engaged with the lead screw
Implementation Method 2
The driving unit may include a worm wheel connected with the other end of the rotating shaft to rotate the rotating shaft and a worm shaft engaged with the worm wheel to rotate the worm wheel
Implementation Method 3
the stabilizer bar performs an anti-roll function that suppresses roll of the vehicle body using torsional elastic force generated while being distorted
Data Source
AI summary
Provided is an active roll control apparatus for controlling a stiffness value of a stabilizer bar by moving the stabilizer bar, which is installed between left and right wheels of a vehicle and extends in a first direction, and a stabilizer link connected with the stabilizer bar to improve turning stability of the vehicle by actively controlling roll stiffness of the vehicle. The active roll control apparatus includes rotating shafts having one ends connected to both ends of the stabilizer bar, moving units into which the rotating shafts are inserted and which are movable along outer side surfaces of the rotating shafts in a second direction perpendicular to the first direction, and a driving unit configured to rotate the rotating shafts to move the moving units.