Prototype X announced the 2008 Lancer
13 July 2007.
Mitsubishi Motors Corporation
announced last Tuesday that it developed two new
component systems that are expected to feature in the
new Lancer Evolution (X), due to be launched this
The first new component system is the
Super All Wheel Control (S-AWC), an advanced vehicle
dynamics control system that regulates drive torque at
Center Differential (ACD) incorporates
an electronically-controlled hydraulic
multi-plate clutch to optimize
front/rear wheel torque split and
provide the best balance between
traction and steering response.
The second one is the Twin Clutch SST
(Sport Shift Transmission), which is an automated manual
transmission designed to deliver slicker shifting
through the gears while freeing the driver from the need
to operate the clutch.
Mitsubishi claims that Twin Clutch
SST and S-AWC help making driving more intuitive. Both
systems work to efficiently distribute power appropriate
to road conditions, and deliver better control with
stability maintained by an "intelligent"
system that "reads" and reflects driver intent
in real time.
Yaw Control (AYC) uses a torque transfer
mechanism in the rear differential to
control rear wheel torque differential
for different driving conditions. It
also acts like a limited slip
differential by suppressing rear wheel
slip to improve traction.
The S-AWC system adds an ASC
(Active Stability Control) feature to the ACD (Active
Center Differential), AYC (Active Yaw Control, see
photo) and Sport ABS (Sport Antilock Brake System)
components that have proven themselves in the Lancer
Evolution series (see yellow box).
The integrated system management of
these four components regulates torque and braking force
at each wheel. S-AWC also now employs yaw rate feedback
control. This allows the system to control each wheel
under a wide range of driving conditions, thus realizing
vehicle behavior that reflects driver inputs and allows
drivers of all abilities to enjoy sporty motoring with
(mounted on current Lancer Evolution
IX): vehicle dynamics control system to
regulate drive torque at each wheel.
Twin Clutch SST - MMC's new
automated manual transmission employs dual clutches to
realize power transmission efficiencies on a par with a
normal manual gearbox while also allowing slick and
Allowing drivers of all abilities to
shift rapidly up and down through the gears, Twin Clutch
SST delivers sporty acceleration while also returning
superior fuel mileage thanks to its high-efficiency
power transmission mechanism. The new transmission also
features three operating modes tailored to different
situations: from around-town drivability to
instant-response and follow-the-line sporty motoring on
the open road.
How it works?
vehicle dynamics control system
integrates management of all its AYC,
ACD, ASC and Sport ABS components while
adding braking force control to
Mitsubishi Motors' own AYC system. As a
result S-AWC elevates drive power,
cornering performance as well as vehicle
stability under all driving situations,
from everyday motoring to emergency
Center Differential ( ACD)
multi-plate clutch. The system optimizes
clutch cover clamp load for different
driving conditions, regulating the
differential limiting action between
free and locked states to optimize front/rear
wheel torque split and thereby producing
the best balance between traction and
Yaw Control (AYC, see photo) uses a
torque transfer mechanism in the rear
differential to control rear wheel
torque differential for different
driving conditions and limit the yaw
moment that acts on the vehicle body.
AYC also acts like a limited slip
differential by suppressing rear wheel
slip to improve traction. AYC was first
used in the Lancer Evolution IV launched
in April 1996. In comparison to the
system used in the Lancer Evolution IX,
AYC now features yaw rate feedback
control using a yaw rate sensor and also
gains braking force control. Monitoring
the cornering dynamics on a real-time
basis, the system controls vehicle
behavior through corners and realize
vehicle behavior that more closely
mirrors driver intent.
Stability Control ( ASC) stabilizes
the vehicle while maintaining optimum
traction by regulating engine power
and the braking force at each wheel.
Taking a step beyond the previous
generation Lancer Evolution, the fitting
of a brake pressure sensor at each wheel
allows more precise and positive control
of braking force. ASC prevents the
driving wheels from spinning on slippery
surfaces and/or in an emergency evasive
maneuver or after sudden steering
ABS (Sport Anti-lock Braking System)
allows the driver to maintain steering
control and keeps the vehicle stable by
preventing the wheels from locking under
heavy braking or when braking on
slippery surfaces. The addition of yaw
rate sensors and brake pressure sensors
to the Sport ABS system has improved
braking performance through corners
compared to the Lancer Evolution IX.
use of engine torque and brake pressure
information in the regulation of the ACD
and AYC components allows the S-AWC
system to determine more quickly whether
the vehicle is accelerating or
also employs yaw rate feedback for the
first time. The system helps the driver
follow his chosen line more closely by
comparing how the car is running, as
determined from data from the yaw rate
sensors, and how the driver wants it to
behave, as determined from steering
inputs, and operates accordingly to
correct any divergence.
addition of braking force regulation to
AYC's main role of transferring torque
between the right and left wheels
allows S-AWC to exert more control over
vehicle behavior in on-the-limit driving
braking force on the inside wheel during
understeer and on the outer wheel during
oversteer situations, AYC's new braking
force control feature works in concert
with torque transfer regulation to
realize higher levels of cornering
performance and vehicle stability.
integrated management of the ASC and ABS
systems allows S-AWC to effectively and
seamlessly control vehicle dynamics when
accelerating, decelerating or cornering
under all driving conditions.
offers three operating modes:
TARMAC for dry, paved surfaces; GRAVEL
for wet or unmade surfaces, and SNOW for
snow covered surfaces. The driver
selects the mode best suited to current
road surface conditions.
SST: Mechanism: The Twin
Clutch SST puts odd (1st, 3rd, 5th) and even (2nd, 4th
and 6th) gears on separate input shafts, each connected
to an individual clutch. With both clutches under
precise system control, this arrangement allows very
fast, smooth and lag-free gear changes with no
interruption in power delivery.
Using clutches instead
of a torque converter to transmit power makes the Twin
Clutch SST simpler in structure and reduces power
transmission losses for higher transmission efficiency
that leads to improved fuel mileage.
Twin Clutch SST allows
the driver to switch between three shifting programs --
Normal, Sport and S-Sport -- to cover the full range of
driving situations, from town use to sporty motoring on
Normal mode is
for use around town and other normal driving situations,
Its uses relatively low-speed shift points to deliver
unobtrusive shifting for maximum comfort together with
optimum fuel economy.
Sport mode is
more adapted to driving in the mountains or when engine
braking is required. It uses higher shift points and
quicker shifting to deliver instant throttle response.
Compared with Sport
mode, S-Sport mode keeps the engine turning at
higher revs while allowing very fast shifting.