Electromagnetic Suspension Actuator with Adaptive Stroke Velocity Filtering
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Solution Overview
Problem
Conventional electrically powered suspension systems fail to balance stability and responsiveness, leading to vibration issues when vibration is input to the electromagnetic actuator, as they either suffer from poor stability or insufficient vibration suppression near resonance points.
Innovation Solution
The system incorporates an electromagnetic actuator with an information acquisition unit, a target damping force calculation unit, and a filter processing unit that applies specific filtering characteristics based on stroke velocity and rate of change of damping force, ensuring stability and responsiveness by selectively applying filtering characteristics in different frequency regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a filtering process is applied to stroke velocity to improve system stability, then stability is improved, but responsiveness to vibration suppression deteriorates
Solution Approach 1:
The filter processing unit dynamically switches between multiple filtering characteristics based on operating conditions (stroke velocity magnitude). When stroke velocity is large, a filtering characteristic with stronger attenuation is applied to ensure stability. When stroke velocity is small, a filtering characteristic with weaker attenuation is applied to maintain responsiveness. This dynamic adaptation resolves the contradiction between stability and responsiveness.
Solution Approach 2:
The system changes the filtering parameters (cut-off frequency, attenuation rate) based on the magnitude of stroke velocity. By adjusting these parameters dynamically, the system achieves both stability (when needed) and responsiveness (when needed), resolving the technical contradiction between these two opposing requirements.
2Object-affected harmful factors
If filtering characteristics are applied to suppress vibration near resonance points, then vibration suppression is improved, but system stability deteriorates
Solution Approach 1:
Different filtering characteristics are applied locally based on the specific operating condition (stroke velocity magnitude). For large stroke velocities, filtering characteristics that prioritize stability are applied. For small stroke velocities, filtering characteristics that prioritize vibration suppression near resonance points are applied. This localized approach resolves the contradiction between vibration suppression and system stability.
3Speed
If the system prioritizes responsiveness over stability, then responsiveness is improved, but the system may enter a vibration state
Solution Approach 1:
The filter processing unit continuously monitors the stroke velocity and automatically switches between different filtering characteristics based on the current operating state. This feedback mechanism ensures that when the system approaches conditions that may cause vibration states, the filtering characteristic is adjusted to restore stability, thus preventing unreliable operation while maintaining responsiveness during normal operation.
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 effectively suppresses vehicle vibrations while maintaining system stability and responsiveness, preventing the system from entering a vibration state and ensuring adequate damping near resonance points.
Implementation Method 1
The electromagnetic actuator includes a ball screw mechanism in addition to the electric motor. The electromagnetic actuator operates to generate a driving force related to the damping operation by converting rotary motion of the electric motor into linear motion of the ball screw mechanism.
Implementation Method 2
The electromagnetic actuator operates to generate a driving force related to the damping operation by converting rotary motion of the electric motor into linear motion of the ball screw mechanism.
Data Source
AI summary
An electrically powered suspension system includes: an electromagnetic actuator configured to generate a driving force related to vibration damping of the vehicle; an information acquisition unit configured to acquire information on a stroke velocity of the electromagnetic actuator; a target damping force calculation unit configured to calculate a target damping force based on the stroke velocity; a drive control unit configured to control driving of the electromagnetic actuator based on the target damping force; and a filter processing unit configured to perform a filtering process by applying a predetermined filtering characteristic to the stroke velocity. The filter processing unit has a plurality of filtering characteristics set in a second frequency region, which has a frequency higher than that of a first frequency region. The filter processing unit selectively applies, among the plurality of filtering characteristics, one filtering characteristic that is based on the stroke velocity to the stroke velocity.