Mitsubishi LANCER EVOLUTION-VII 2001, Техническое руководство

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POWER TRAIN - ACD and AYC
2-12
ACTIVE CENTER DIFFERENTIAL (ACD) AND ACTIVE YAW
CONTROL (AYC)
The LANCER EVOLUTION-VII adopts the newly developed active center differential (ACD).
The driving performance of the ACD has been improved by varying the center differential drive by electronic
control.
The yaw moment is directly controlled by the active yaw control (AYC) adopted from EVOLUTION-V
onwards to improve the turning performance.
By combining and integratedly controlling these two systems, the driving performance has been further
improved.
RS, RS II
ACD Option
ACD and AYC Option
OUTLINE OF CONTROL
The following effects are obtained by equipping the ACD or ACD and AYC.
State of vehicle ACD AYC Integrated control effects
1. During de-
celeration
(Before
corners)
Similar to the direct engagement
4WD by increasing the center
differential during sharp decelera-
tion to improve stability in decelera-
tion.
[When decelerated during
turning]
The driving power is moved to
the inside turning wheel to
reduce the tack in.
Stability against various
external influences such as
poor road conditions and
driver operations have been
improved.
2. First half of
turning
(Corner en-
trance)
The center differential restriction is
reduced according to the steering
angle and operation speed to set
the center differential as close as
possible to the free state and
improve turning performance.
The driving power is moved to
the outside turning wheel
according to the steering
angle and operation speed to
improve the turning perfor-
mance.
The response to steering
operations (brisk move-
ment) is improved as much
as possible.
3. Latter half
of turning
(Corner
exit)
The center differential restriction is
enhanced according to the amount
the acceleration is stepped to set
similar effects as the direct engage-
ment 4WD and improve the accel-
eration performance.
The driving power is moved to
the outside turning wheel
according to the amount the
acceleration is stepped to
decrease the acceleration
understeer and improve turn-
ing performance.
Two elements (acceleration
and turning) have been
improved simultaneously.
ACD: Free
AYC: Turning
1. During deceleration
2. First half of turning
ACD: Direct
engagement
AYC: Tack in deceleration
(During deceleration when turning)
3. Latter half of turning
AYC: Under steer deceleration
ACD: Direct engagement