Preview Vibration Damping Control for Changing Road Surfaces
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Solution Overview
Problem
Conventional vibration damping control systems for vehicles may generate control forces in the wrong direction when road surface conditions change, leading to increased vibrations of the sprung portion due to discrepancies between current and past road surface conditions stored in databases.
Innovation Solution
A vibration damping control apparatus that determines whether road surface conditions have changed by comparing real-time road surface displacement values with historical data, adjusting control forces accordingly to prevent increased vibrations by reducing or maintaining target control forces based on the probability of condition changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If preview vibration damping control is executed using road surface displacement data from a road map database, then vibration of the sprung portion can be suppressed, but when road surface conditions change, the control force may be generated in the opposite direction leading to increased vibrations
Solution Approach 1:
The control unit compares the actual road surface displacement measured by the measurement vehicle with the predicted road surface displacement from the road map database. When a discrepancy is detected, the control unit adjusts the control force accordingly. This feedback mechanism ensures that the preview control adapts to actual road conditions while maintaining the vibration suppression benefits of using historical data.
Solution Approach 2:
The system obtains road surface displacement data in advance through measurement vehicles and stores it in the road map database. This preliminary action allows the main vehicle to receive preview information about upcoming road conditions and prepare appropriate control forces before actually encountering the road sections, improving both vibration suppression and adaptability.
2Reliability
If the control force is increased to counteract predicted road surface displacement, then vibration damping effectiveness is improved, but energy consumption and wear on actuators increases
Solution Approach 1:
The control unit calculates the control force based on the discrepancy between actual and predicted road surface displacement. When the road surface condition has not changed, the full preview control force is applied for optimal vibration suppression. When changes are detected, the control force is adjusted to the appropriate level, avoiding excessive actuator operation and reducing energy consumption while maintaining sufficient damping effectiveness.
Data Source
AI summary
A vibration damping control apparatus of a vehicle executes preview vibration damping control for controlling a control force generating apparatus on the basis of a final target control force including a first target control force computed by using preview information. When the vibration damping control apparatus determines that the probability that a road surface condition has changed after a past point in time is high, the vibration damping control apparatus executes particular control for setting the magnitude of the first target control force to become smaller.