Active Suspension Control Using Vehicle Body Vibration Prediction
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Solution Overview
Problem
Conventional active suspension systems for vehicles are limited in response time for vibration suppression, as they can only be controlled after the seat has vibrated, leading to delays in damping control and potential instability.
Innovation Solution
A control device that includes a vibration detector on the vehicle body to detect the vibration state, allowing the active suspension to be controlled based on the corresponding-position state amount, which estimates the vibration state of the seat, enabling earlier and more responsive control without the need for sensors on the carrier.
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 the seat, then the control system is simple, but the response time for vibration suppression is delayed
Solution Approach 1:
The vibration detector is disposed on the vehicle body to detect vibrations before they are transmitted to the seat. The controller calculates the corresponding-position state amount representing seat vibration based on the detected vehicle body vibration, enabling the active suspension to be controlled in advance before the seat actually vibrates, thus improving response time without requiring sensors on the seat
2Measurement precision
If sensors are provided on the carrier to detect vibration, then the vibration detection is accurate, but the number of sensors and installation space increases
Solution Approach 1:
The vehicle body acts as an intermediary between the vibration source and the seat. By disposing the vibration detector on the vehicle body and calculating the corresponding-position state amount, the system indirectly measures the vibration that will affect the seat, eliminating the need for direct sensors on the seat while maintaining detection accuracy
Data Source
AI summary
A control device for a vehicle includes: a carrier installed on a vehicle and on which an occupant or an object to be conveyed is placed; an active suspension disposed between the carrier and a body of the vehicle and capable of controlling a force that acts between the carrier and the vehicle body; a vibration detector configured to detect a vibration state of the vehicle body; and a controller configured to calculate, based on a detection result of the vibration detector, a corresponding-position state amount indicating the vibration state of a portion of the vehicle body corresponding to a position where the carrier is disposed and control the active suspension based on the corresponding-position state amount.