Active Roll Control via Integrated Suspension Arm Actuator
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Solution Overview
Problem
Existing active roll control systems for vehicles face challenges in maintaining stability during turns due to constant torsional stiffness and require large forces to operate within the behavior range, leading to reduced durability and increased susceptibility to chipping from vibrations and foreign objects.
Innovation Solution
The system integrates an actuator with the suspension arm, eliminating the need for a push rod and allowing stabilizer links to operate within the suspension arm's behavior range, with a gear housing and motor configuration that enhances power transmission efficiency and reduces compliance influence, while maintaining actuator durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate actuator and push rod configuration is used to change stabilizer bar stiffness, then active roll control is achieved, but the system becomes more complex and more susceptible to chipping from vibrations and foreign objects
Solution Approach 1:
The actuator is integrated directly into the suspension arm structure, eliminating the separate push rod component. The motor housing and gear housing are merged with the suspension arm to form a unified structure, reducing the number of separate parts and connection points that could be susceptible to chipping while maintaining the active roll control function.
Solution Approach 2:
The push rod is completely removed from the system. By integrating the actuator directly into the suspension arm, the intermediate push rod component is extracted and eliminated, simplifying the mechanical transmission path and reducing potential failure points.
2Reliability
If the actuator operates outside the suspension arm's behavior range, then roll control is achieved, but large forces are required reducing durability
Solution Approach 1:
The actuator is positioned to operate dynamically within the suspension arm's natural behavior range rather than outside it. The connection point on the suspension arm is specifically selected so that the actuator's motion follows the suspension arm's movement characteristics, allowing operation within optimal force ranges.
Solution Approach 2:
The position parameters of the actuator connection points are optimized to change the lever ratio and operating characteristics. By adjusting where the actuator connects to the suspension arm, the system operates within the suspension arm's behavior range, reducing the forces required.
3Stability of the object's composition
If stabilizer links are positioned outside the behavior range, then roll control is achieved, but compliance influence increases reducing stability
Solution Approach 1:
The stabilizer link connection points are positioned to operate within the suspension arm's behavior range, allowing the system to dynamically adapt to suspension movements without excessive compliance influence. This positioning ensures stable operation while maintaining responsiveness to roll 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
This configuration actively controls roll strength by varying the lever ratio of stabilizer links, improves vehicle stability during turns, and minimizes the impact of vibrations and foreign objects on the actuator's durability.
Implementation Method 1
a power transmission slidably disposed in the gear housing, having a screw thread on a rear inner side
Implementation Method 2
the stabilizer bar suppresses roll of a vehicle using a torsional elastic force while twisting when the left and right wheels move up/down
Data Source
AI summary
An active roll control system that actively controls roll by changing roll strength of a stabilizer bar by varying a connection position of a stabilizer link, which connects both ends of the stabilizer bar on a subframe with a suspension arm, on the suspension arm. The suspension arm includes a rail unit that has a top opening and includes slide rails arranged in a vehicle width direction within the rail unit, and guides a connector connected with the lower end of the stabilizer link along the slide rails. In addition, an actuator unit of the suspension arm has a driving shaft connected with the connector and provides a forward and rearward driving force to the connector.