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Development of roll attitude control theory for semi-active suspension system
Technical Paper
2000-05-0177
Sector:
Language:
English
Abstract
A bodywork roll attitude during cornering is not a simple rotary
motion around the geometrical roll center. It is a complicated
rotary motion including vertical motion under the influence of a
lot of forces caused by suspension links and components. This
motion affects not only vehicle dynamics, but also roll feeling
evaluated by a driver. Therefore a vehicle roll attitude is
recognized as one of factors to characterize the vehicle handling
performance, and a suspension system is designed considering this
point. Concerning the roll feeling, it is known that human being
feels insecurity and discomfort toward "floating," and
the vertical motion during cornering has a relationship with
subjective ratings by a driver.
Tis paper presents the roll attitude control theory
"Virtual Damper Control (VDC)" considering above
behavior, and confirms the effects by comparing with current
anti-roll control. The trait of VDC is to create a down roll
attitude by defining virtual dampers inside of the corner. From the
simulation study and the experiments using actual vehicle, the
following results were verified. 1. The roll attitude created by
VDC improved the roll feeling and the sense of security of driver.
2. The roll attitude created by VDC decreases the amount of weight
transfer about 20% and improved the balance of tire lateral force
distribution ratio about 5%. 3. From the results of above effects,
the yaw response was improved and it decreased the steering wheel
inputs.