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3. TOD OPERATION
1) 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 phenomenon 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.
2) Mode Selection
The TOD system has 2 selectable mode, 4H
and 4L. 4H is the normal operating mode
when drive of which gear ratio is 1:1 and 4L
mode distributes power to front and rear
wheels 50:50 of which gear ratio is 2.48:1.
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