Mitsubishi Evolution X. Manual — part 145

SUPER ALL WHEEL CONTROL (S-AWC)

TSB Revision

MANUAL TRANSAXLE

22A-7

AWC SWITCH

With the operation of AWC switch, the driving mode can be
switched among TARMAC, GRAVEL, and SNOW.
Depending on the mounting position, the mode switching dif-
fers with the AWC switch.

• Steering wheel

(TARMAC

⇔ GRAVEL ⇔ SNOW)

• Floor console <Vehicles with steering wheel audio remote

control>
(TARMAC

→ GRAVEL → SNOW → TARMAC)

.

MULTI INFORMATION DISPLAY

The current driving mode is displayed at all times to the upper
center of multi information display. When the mode is switched,
the mode switching status is displayed automatically to the
information screen at the middle, and then the screen returns to
the previous screen after the completion of setting.

Also, by the operation of multi information meter switch, an
exclusively designated screen for displaying the AWC opera-
tion status can be set to the information screen at the middle.
This exclusively designated screen displays the ACD differen-
tial limit status to the screen center, and the yaw movement
control status by AYC to the screen left and right.

AC709649AC

AC706060 AC

AC706013

GRAVEL

SNOW

TARMAC

AWC mode

AWC mode
(When switched)

AC

AC705117AC

ACD differential limit
status

Yaw movement
control status
by AYC
(Figure: When the
right-turn moment
is applied)

SUPER ALL WHEEL CONTROL (S-AWC)

TSB Revision

MANUAL TRANSAXLE

22A-8

CONTROL OVERVIEW

M2223000800028

AWC CONTROL MODE

The AWC control is the same as with EVOLUTION
IX, and the control mode can be switched among
TARMAC, GRAVEL, and SNOW in response to road
conditions.

SENSOR INFORMATION

Together with the sensor information used with EVO-
LUTION IX, information on engine torque, engine
speed, and brake pressure yaw rate have been
added to enable more substantial control, thus
improving the responses to vehicle driving condi-
tions.

YAW RATE FEEDBACK CONTROL

.

INTRODUCTION OF YAW RATE
FEEDBACK CONTROL

Using the yaw rate sensor information, the vehicle
cornering status is accurately determined, and the
vehicle cornering motion that is faithful to the driver's
steering operation has been achieved.

.

AWC control mode Control content
TARMAC

Mainly for a dry paved road surface. A slight control is performed with ACD, and a
focused control is performed with AYC (lateral torque movement control, brake
control).

GRAVEL

Mainly for a wet road surface and dirt road. A slightly strong control is performed with
ACD, and a mid-range control is performed with AYC (lateral torque movement
control, brake control).

SNOW

Mainly for snowy roads. A focused control is performed with ACD, and a slight control
is performed with AYC (lateral torque movement control, brake control).

SUPER ALL WHEEL CONTROL (S-AWC)

TSB Revision

MANUAL TRANSAXLE

22A-9

EFFECTS OF YAW RATE FEEDBACK CONTROL

With the cornering performance of when vehicle is
steered to trace a turning circle of certain radius
while the speed is gradually increased, the under-
steer is further suppressed compared to the
ACD/AYC control adopted with EVOLUTION IX,

resulting in a further improvement to cornering per-
formance. For the quick steering lane change on a
slippery road surface, the stability and convergence
of vehicle behavior at the completion of lane change
have also been improved.

BRAKE CONTROL

.

ADDITION OF BRAKE CONTROL

In addition to the conventional lateral torque move-
ment control, a new brake control has been added to
AYC. It is activated near the driving limit range to
assist the yaw motion control.

Brake force is applied to the inside wheels while the
vehicle behavior is understeer during cornering, and
to the outside wheels when oversteer, achieving the
vehicle cornering performance that corresponds to
the driver's operation. Also, the spinning of front
wheels at vehicle start is suppressed by the brake
force, improving the traction performance.
This brake control can be deactivated with the ASC
OFF switch.

.

AC705142 AC

Cornering limit has been improved.

Current ACD/AYC control

AWC
control

Under-steering
has been
reduced.

Centripetal acceleration

0

0

0

Current ACD/AYC control

AWC control

Convergence and stability
have been improved.

Steering
angle

Yaw rate

Time

Steering
angle
ratio

AC705118 AC

AWC-ECU

Brake control command

ASC-ECU

Brake force is
generated.

Master cylinder brake
hydraulic pressure sensor

Hydraulic unit

Brake force is
generated.

Brake force is
generated.

Brake force is
generated.

Offers information
of sensor and ASC
status.

Wheel cylinder brake
hydraulic pressure sensor

SUPER ALL WHEEL CONTROL (S-AWC)

TSB Revision

MANUAL TRANSAXLE

22A-10

EFFECTS OF BRAKE CONTROL

The understeer behavior and oversteer behavior
near the driving limit range are further suppressed.

INTEGRATED CONTROL OF
ACD/AYC/ASC/ABS

ASC has been added to ACD, AYC, and ABS that
are equipped with LANCER EVOLUTION IX, and an
integrated control is performed to enhance the driv-
ing performance, cornering performance, and stabil-
ity in any driving condition during acceleration,
deceleration, and cornering.

ADDITION OF TC-SST CONTROL
<VEHICLES WITH TC-SST>

For vehicles with TC-SST, AWC-ECU communicates
with TC-SST-ECU via CAN line to suppress unnec-
essary gear shifts during cornering which hamper the
sport driving.