TITLE:
Active Control Method for Critical Cornering Range
AUTHORS:
Takahiko Yoshino, Hiromichi Nozaki
KEYWORDS:
Motion Control, Automobile, Vehicle Dynamics, Maneuverability, Active Safety
JOURNAL NAME:
Engineering,
Vol.6 No.8,
July
11,
2014
ABSTRACT: It has been
reported that steering systems with derivative terms have a heightened lateral
acceleration and yaw rate response in the normal driving range. However, in
ranges where the lateral acceleration is high, the cornering force of the front
wheels decreases and hence becomes less effective. Therefore, we applied
traction control for the inner and outer wheels based on the steering angle
velocity to improve the steering effectiveness at high lateral accelerations.
An experiment using a driving simulator showed that the vehicle’s yaw rate
response improved for a double lane change to avoid a hazard; this improves
hazard avoidance performance. Regarding improved vehicle control in the
cornering margins, traction control for the inner and outer wheels is being
developed further, and much research and development has been reported.
However, in the total skid margin, where few margin remains in the forward and
reverse drive forces on the tires, spinout is unavoidable. Therefore, we
applied tire camber angle control to improve vehicle maneuverability in the
total skid margin. An experiment using a driving simulator has confirmed that
the vehicle’s lateral acceleration at the turning limit can be improved by
controlling the camber angle. Because of this, camber angle control promises to
be more effective than traction control for the inner and outer wheels. By
applying this type of steering control, it is possible to increase maneuverability
and stability in the cornering margins.