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4wd Vehicle Behavior During Braking in a Turn
Technical Paper
876054
Sector:
Language:
English
Abstract
Vehicle behavior during braking in a turn is important for
vehicle stability and controllability. Behavior of a four wheel
drive (4WD) vehicle is different from that of a two wheel drive
(2WD) vehicle due to larger moment of inertia of driveline and
restraint condition between front and rear anxle.
Theoretical analysis and experimental study were conducted on
the behavior of three typical 4WD systems; 1) 4WD with center
differential, 2) 4WD with directly connected front and rear axles,
and 3) 4WD with viscous coupling (viscous transfer type).
In order to confirm the validity of the simulation, vertical,
longitudinal and lateral forces working on four wheels during
braking in a turn were measured by a six-component wheel load cell
installed on each wheel.
This study clarifies that the influence of suspension
characteristics and brake force distribution is important in 4WD
vehicles with center differential and the influence of suspension
characteristics is important in directly connected 4WD vehicles and
4WD vehicles with viscous coupling.