Distribution Of Driving Force According To Road Surface - SSANGYONG 2004 Rexton 2.7XDi Workshop Manual

GENERAL INFORMATION AND OPERATION
OVERVIEW
TOD system means the full time 4WD system and the
registered trade mark of Borg Warner. TOD is an abbre-
viation of Torque On Demand.
TOD (Torque On Demand) system, which is superior than
existing Full Time 4WD, checks the road surface and ve-
hicle conditions via various sensors and, subsequently,
according to the situations and conditions, distributes the
most optimal driving force to front wheels and rear wheels
by activating the electro-magnetic clutch located inside of
TOD Transfer Case.
TOD receives the speed signals from speed sensors in-
stalled in front axle and rear axle, the TPS signals from
engine, and the operating signals from ABS control unit
via CAN. Based on these data, TOD control unit controls
the electro-magnetic clutch to distribute the 3:97 ~ 44:56
of driving force to front wheels and rear wheels.
The conventional system uses "FR driving" (theoretically,
the 100 % of driving force is transferred to rear wheels) on
normal paved road. When the system detects a slip in the
rear wheels, a proper percentage of driving force is trans-
ferred to front wheels.
TOD control unit receives the wheel speed signals from
the speed sensors in propeller shaft of transfer case and
engine output information from the engine control unit. TOD
control unit changes the pressure force of the electro-
magnetic clutch based on the analyzed data.
TOD
REXTON SM - 2004.4
Distribution of Driving Force
According to Road Surface
1. On normal road surface
In vehicle with existing part time transfer case, when
a driver turns the steering wheel to park in the 4WD
mode, the vehicle may halt sensation of tight corner
braking phenomena. However, in vehicle with TOD
system, this phenomena does not occur and the
driving force is properly and automatically distributed.
2. On paved road with high speed
Driving at high speed on roads such as highway
mainly uses rear wheels as driving wheel. At this
moment, some of torques is also distributed to front
wheels so that the vehicle could maintain safe ground
grab capacity against side winds and rain. Distribution
ratio: 15 % for front wheels and 85% for rear wheels.
3. When turning on the road with low friction rate
During cornering on roads such as unpaved, snowy,
icy and muddy, ground grab capacity is increased
by distributing required torque and, at the same time,
comfortable steering operation is maintained by
controlling the ground grab capacity at high level.
Distribution ratio: 30 % for front wheels and 70 % for
rear wheels.
4. When climbing or starting off on the road with low
friction rate
In order to secure the maximum ground grab capacity
and driving force during climbing or starting off on the
roads such as unpaved, snowy and icy road, the
system controls the driving force to distribute properly
in full 4WD mode. Distribution ratio: 50 % for front
wheels and 50 % for rear wheels.
3E-3
Y220_03E001
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN