Active Suspension Control Unit Reducing Response Delays
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Solution Overview
Problem
Conventional active roll stabilization (ARS) suspension control systems experience delays and fail to effectively handle disturbances in wheel height changes, leading to compromised passenger comfort and driving stability, especially under varying road conditions.
Innovation Solution
An active suspension control unit and method that incorporates a first controller for determining a desired relative suspension vertical force based on driving situations and a second controller for adjusting actuator control values using the difference in relative suspension vertical velocities between left and right wheels, minimizing response delays and improving stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a feedback method is used to determine desired relative suspension vertical force based on relative suspension vertical velocity, then the suspension can be controlled according to driving situation, but it causes a delay phenomenon and does not properly handle disturbance situations
Solution Approach 1:
The patent introduces a disturbance observer that proactively estimates disturbance forces (such as road irregularities) before they significantly affect suspension performance. By predicting disturbances in advance and compensating for them preemptively, the system eliminates response delays and improves disturbance handling without waiting for feedback signals to trigger corrections
Solution Approach 2:
The patent employs a disturbance observer as an intermediary component that estimates unmeasured disturbance forces based on available sensor data. This observer acts as a mediator between the control input and actual suspension behavior, providing real-time disturbance compensation that bridges the gap between commanded and actual suspension performance
2Ease of operation
If the stabilizer bar is set to be soft for passenger comfort, then comfort is improved, but driving stability deteriorates
Solution Approach 1:
The patent implements an active roll stabilization system that dynamically adjusts the stabilizer bar stiffness in real-time based on driving conditions. The system can transition from a soft configuration for comfort during normal driving to a hard configuration for stability during cornering or rough roads, eliminating the need for compromise in fixed-structure stabilizer bars
Solution Approach 2:
The patent changes the stiffness parameter of the stabilizer bar dynamically through active control. By varying the mechanical or electromagnetic properties of the stabilizer bar based on sensor feedback and control algorithms, the system optimizes both comfort and stability performance across different driving scenarios rather than being constrained by a fixed stiffness value
3Stability of the object's composition
If the stabilizer bar is set to be hard for driving stability, then driving stability is improved, but passenger comfort deteriorates
Solution Approach 1:
The active roll stabilization system dynamically adjusts stabilizer bar stiffness based on real-time driving conditions. During cornering or on rough roads, the system increases stiffness for enhanced stability, while during normal smooth driving, it reduces stiffness to maintain passenger comfort, thus adapting to different operational requirements
4Ease of manufacture
If a conventional feedback control method is used, then the system is simple to implement, but it cannot rapidly suppress roll/yaw motions under varying road conditions
Solution Approach 1:
The disturbance observer performs preliminary estimation of disturbance forces before they fully manifest in suspension motion. This proactive approach enables the controller to prepare compensation actions in advance, significantly reducing response time for suppressing roll and yaw motions while maintaining a relatively simple control architecture
Data Source
AI summary
An active suspension control unit may include an actuator having an active roll stabilization (ARS) structure to variably adjust response characteristics of a suspension, and a controller for determining a driving situation of a vehicle through information input from a sensor, and determining a final desired control value of the actuator based on a desired relative suspension vertical force value set in advance according to the driving situation and a difference value generated by a difference between left and right wheel's relative suspension vertical velocities.