Vehicular Suspension Roll Center Controller Dynamics
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Solution Overview
Problem
Conventional vehicular suspension systems that adjust roll center heights for improved roll behavior during turning under different loading conditions fail to consider vertical forces applied to wheels, leading to reduced vehicle driving stability, especially on rough roads and during high-speed turns.
Innovation Solution
A vehicular suspension device with a roll center controller that adjusts roll center heights based on vehicle speed and road surface information using an actuator, lowering roll centers on rough roads to reduce vertical forces and raising them during high-speed turns to minimize roll moments, thereby enhancing stability and movement performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the roll center height is raised to improve roll behavior during turning, then vehicle movement performance is improved, but vertical force on wheels increases causing vehicle wobble and reduced driving stability
Solution Approach 1:
The patent applies dynamics by making the roll center height adjustable during vehicle operation rather than fixed. The roll center position is dynamically changed based on real-time detection of vehicle speed and road surface conditions, allowing the system to optimize between movement performance and driving stability according to actual operating conditions
Solution Approach 2:
The patent changes the parameter of roll center height based on detected vehicle speed and road surface information. When high-speed turning is detected, the roll center height is increased to improve movement performance; when rough road surfaces are detected, the roll center height is decreased to reduce vertical forces and maintain driving stability
2Ease of operation
If the roll center height is adjusted based only on roll behavior considerations, then turning performance is improved, but vertical forces on wheels are not controlled leading to increased vehicle wobble
Solution Approach 1:
The patent implements feedback by detecting vehicle speed and road surface conditions, then using this information to adjust the roll center height accordingly. The system continuously monitors operating conditions and adjusts the roll center position to prevent both excessive vehicle wobble on rough roads and insufficient turning performance on smooth roads
Solution Approach 2:
The patent applies preliminary action by adjusting the roll center height in advance based on detected road surface conditions and vehicle speed before critical situations occur. When rough road surfaces are detected, the roll center is lowered preemptively to prevent vehicle wobble; when high-speed turning is anticipated, the roll center is raised to ensure optimal turning performance
Data Source
AI summary
Provided is a vehicular suspension device that achieves both of improvement in driving stability and improvement in vehicle movement performance. The vehicular suspension device includes a suspension capable of adjusting a roll center height by control of an actuator, and a roll center controller. The controller includes a traveling state corresponding height determination unit configured to determine the roll center height of the suspension in accordance with a predetermined rule on the basis of vehicle speed information and road surface information, and an actuator controller configured to control the actuator so that the roll center height reaches the roll center height determined by the unit.