Vehicle Suspension Control for Concurrent Vibration and Roll Suppression
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Solution Overview
Problem
When vibration suppression control and roll control are executed concurrently in a vehicle, the roll of the sprung portion may be increased, and the target roll control force may become insufficient, leading to ineffective reduction of roll.
Innovation Solution
A vehicle travel state control device and method that generates a control force in the up-down direction to suppress vibration by predicting wheel passage positions and computing target vibration suppression and roll control forces based on road surface displacement information and roll index values, with correction adjustments to the control forces to optimize roll reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vibration suppression control and roll control are executed concurrently, then vibration of the sprung portion is suppressed effectively, but roll of the sprung portion is increased and roll control becomes ineffective
Solution Approach 1:
The patent introduces a correction force as an intermediary element that mediates between the vibration suppression control force and the roll control force. The correction force is generated based on the relationship between the right and left control forces, and is applied to adjust the total control force to prevent excessive roll while maintaining vibration suppression effectiveness
Solution Approach 2:
The patent implements a feedback mechanism where the correction force is continuously adjusted based on the relationship between the right and left control forces generated by the vibration suppression control. The correction force calculation uses the difference and sum of the control forces to dynamically adjust the total control force, ensuring that roll control effectiveness is maintained while vibration suppression is active
Data Source
AI summary
A control unit is configured to execute vibration suppression control, in which the control force generation device is controlled based on a target vibration suppression control force when a wheel passes through a predicted wheel passage position, and roll control, in which the control force generation device is controlled based on a target roll control force for reducing roll of the sprung portion based on a roll index value. When the vibration suppression control and the roll control are executed concurrently, the control force generation device is controlled based on the target vibration suppression control force and the target roll control force obtained after at least one of a reduction correction for the target vibration suppression control force and an increase correction for the target roll control force is performed.