Tod System Function - SSANGYONG Rexton Y200 Manual

5D2-2 TRANSFER CASE - TOD
GENERAL INFORMATION AND OPERATION
TOD system means the full time 4WD system and the
registered trade mark of Borg Warner. TOD is an
abbreviation of Torque On Demand.
TOD control unit automatically tailors torque distribution
to road, offering full time four wheel drive. TOD
distributes electronically-controlled power into front and
rear wheels whose ratio change from 0 : 100 to 50 : 50
complying with wheel speed differences.
Also TOD control unit analyzes data from wheel speed
sensor and engine output then changes pressure of
electromagnetic clutch. This pressure controls front
propeller shaft and power to front wheel. Power to front
wheel depends on degree of pressure corresponding
clutch slip.
TOD is designed to distribute the power to front and
rear axle by operation of 4H/4L switch and shift motor.
Shifting 4WD high (4H) to 4WD low (4L) is performed
towards reducing high-low collar by means for
connection high-low shift fork with output shaft in order
to join with planetary gear. Torque transmits input shaft
then sun gear rotating front planetary gear. Front
planetary gear joins with output shaft and drives at
low position.
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.

TOD SYSTEM FUNCTION

4H Mode
The TOD system transfer case controls the clutch
mechanism to comply with rotation in front and rear
propeller shaft and if its difference exceeds the
permissible range, corresponding power is distributed
into front wheel through electromagnetic clutch (EMC).
Hall effect speed sensors are located front and rear
propeller shafts, send signals to TOD transfer case
control unit (TCCU). The EMC coil is activated by
variable current on exceeding difference of speed in
front and rear propeller shafts.
4L Mode
When select 4L mode, EMC is locked to apply
maximum torque into front and rear propeller shafts.
Shift motor rotates also 4L position by rotation of cam
thus propeller shaft torque changes from 1:1 to 2.48:1
by planetary gear set.
Transfer Case Control Unit (TCCU)
Transfer case control unit (TCCU) receives, front and
rear propeller shaft speed, shift motor position and
4H/4L switch signals and controls electromagnetic
clutch (EMC), shift motor. TCCU communicates with
scan tool with K-line for diagnosis. It located under
the front LH seat.
SSANGYONG Y200