Active Vehicle Suspension for Low-Frequency Body Motion Isolation
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Solution Overview
Problem
Current motion control systems in vehicles fail to effectively isolate the vehicle body from vibrations, particularly low-frequency motions, which can lead to discomfort for passengers and potential damage to the vehicle's components.
Innovation Solution
The implementation of a vehicle suspension system that combines passive and active suspension components, where active suspension components, including six or more actuators, control the motion of the body with respect to the chassis in three linear and three rotational degrees of freedom, using sensors and a controller to determine control signals and apply forces to counteract vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If passive suspension components are used to isolate the vehicle body from vibrations, then the vehicle body can be isolated from high-frequency vibrations, but low-frequency motions cannot be effectively controlled
Solution Approach 1:
The patent replaces traditional passive mechanical suspension components with an active suspension system that uses electric motors and actuators to generate controlled forces. This substitution enables the system to actively counteract both high-frequency and low-frequency vibrations, overcoming the limitation of passive systems that can only handle high-frequency vibrations through spring and damper mechanisms.
Solution Approach 2:
The patent implements a feedback control system that uses sensors to detect vehicle body motion and chassis motion, processes this information through a controller, and adjusts the active suspension actuators in real-time. This closed-loop feedback mechanism enables effective control of low-frequency motions by continuously adapting the suspension forces based on actual vehicle dynamics.
2Reliability
If active suspension components are added to control vehicle body motion, then low-frequency motions can be controlled, but the device complexity increases
Solution Approach 1:
The patent designs the active suspension components to perform multiple functions: they provide structural support for the vehicle body, enable active vibration control, and integrate with existing chassis systems. This multi-functionality reduces the need for separate dedicated components, thereby managing complexity while achieving effective low-frequency motion control.
Solution Approach 2:
The patent merges the active suspension control system with the existing vehicle chassis and body structure. The active suspension actuators are integrated into the chassis, and the control system utilizes sensors and processors that can be incorporated into the vehicle's existing electronic architecture, thereby reducing overall system complexity compared to a completely separate active suspension system.
3Reliability
If the vehicle body is redesigned to accommodate active suspension technology, then optimal performance can be achieved, but manufacturing costs and development time increase
Solution Approach 1:
The patent segments the suspension system into distinct modular components: passive suspension components that remain unchanged, active suspension actuators that can be added as modules, and a control system that operates independently. This segmentation allows the active suspension technology to be implemented without redesigning the entire vehicle platform, maintaining ease of manufacture while achieving optimal performance.
Solution Approach 2:
The patent introduces an intermediate chassis structure that serves as a mediator between the existing vehicle body and the new active suspension components. This intermediate structure provides mounting points and integration interfaces for the active suspension actuators without requiring fundamental changes to the original vehicle body design, thereby facilitating adoption of active suspension technology on existing platforms.
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 significantly reduces the transmission of vibrations to the vehicle body, enhancing passenger comfort and minimizing the impact of road disturbances, while allowing the vehicle body to remain largely unchanged, thus enabling the adoption of active suspension technologies without redesigning existing platforms.
Implementation Method 1
active motion control system uses components that output forces having a controlled magnitude and direction that is determined based on information received from sensors
Implementation Method 2
A passive motion control system uses components such as springs and dampers (e.g., gas or liquid filled dampers) to isolate the sprung mass from the unsprung mass. Thus, passive motion control components function to remove energy from the system.
Data Source
AI summary
A motion control system that includes a support motion control system and a body motion control system. The body motion control system includes passive motion control components and active motion control components.