Active Suspension Control Using Road Preview for Seat Vibration
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Solution Overview
Problem
Conventional active suspensions in vehicles are limited by delayed response in vibration damping control due to reliance on post-vibration detection, leading to reduced control effectiveness and system stability.
Innovation Solution
A control device that predicts vibration states of a vehicle body using road surface information to proactively control an active suspension, eliminating the need for sensors on individual seats by calculating corresponding-position state amounts based on vehicle body vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the active suspension is controlled based on the detection value of an acceleration sensor disposed on a seat, then the control system is simple and reliable, but the control response is delayed because the suspension can only be controlled after the seat is vibrated
Solution Approach 1:
The system performs preliminary action by detecting road surface information before the vehicle actually encounters it, using the obtained information to predict future vibration states and proactively adjust the active suspension. This eliminates the delay inherent in reactive control systems that only respond after vibration occurs.
Solution Approach 2:
The patent introduces road surface information as an intermediary element that mediates between the road surface and the seat vibration. By detecting road surface characteristics in advance and using them to predict seat vibration states, the system achieves faster control response without requiring direct real-time sensing of seat acceleration.
2Measurement precision
If sensors are installed on each seat to detect vibration, then the vibration detection is accurate, but the number of sensors increases leading to higher costs and more installation space
Solution Approach 1:
The patent extracts the vibration detection function from individual seats and relocates it to the vehicle body level. By detecting road surface information and predicting seat vibration states based on vehicle body vibrations, the system eliminates the need for dedicated sensors on each seat while maintaining detection accuracy.
Solution Approach 2:
The vehicle body vibration sensors serve multiple functions: they detect overall vehicle vibrations and enable prediction of seat-specific vibration states. This multi-functional approach allows a single sensor system to provide information for both vehicle stability control and seat vibration suppression without requiring separate sensing systems.
Data Source
AI summary
A control device for a vehicle includes: a carrier installed on the vehicle and on which an occupant or an object to be conveyed is placed; an active suspension disposed between the carrier and the vehicle body and capable of controlling a force that acts between the carrier and the vehicle body; a road surface information obtaining device configured to obtain road surface information that is information on a displacement in an up-down direction of a road surface on which a predetermined subject wheel is scheduled to travel; and a controller configured to control the active suspension. The controller calculates a vibration state of the vehicle body based on the road surface information, calculates, based on the vibration state, a corresponding-position state amount indicating the vibration state of a portion of the vehicle body corresponding to the carrier, and controls the active suspension based on the corresponding-position state amount.