SSANGYONG RODIUS 2004.09 Manual page 65

3) CIRCUIT DESCRIPTION
A. TOD SYSTEM OPERATION
The TOD system is responsible for distributing torque between the front and rear axles. The
TOD monitors the propeller shaft speeds, operating range (High/Low), and ABS activity and
then applies a calculated amount of torque to the front axle by Pulse Width Modulating the
current applied to the EMC.
▶Touch-off torque
The minimum EMC Duty Cycle is based on the vehicle speed and throttle position.
The TOD receives the TPS signal from the following sources:
On vehicles equipped with CAN, the TOD receives the TPS signal from the CAN bus.
▶When slip detection
The TOD continuously monitors the front and rear propeller shaft speeds to detect wheel
slip. Wheel slip control When wheel slip is detected the TOD controls the EMC duty cycle
as necessary until the wheel slip is reduced below the allowable limit. The EMC Duty
Cycle will then be reduced to the Touch-Off value.
▶Brake/ABS strategy
When the ABS System is active, the EMC Duty Cycle is set to a fixed duty cycle (30 %) to
aid in braking without counteracting the ABS System.
▶4L strategy
When the system is operating in 4L, the TOD continues TOD (operation provided that the
propeller shaft speed is below 10 Hz). When the speed increases above 10 Hz, the EMC
Duty Cycle is set to the maximum value (88 %) which applies the maximum available
torque to the front axle.
B. SHIFT REQUIREMENTS
- If 4H/4L switch position is not matched with shift motor position code with the ignition
switch "ON", the shift requirements operate to the direction of 4H/4L conversion
- switch.
The next shift requirements are identified only when those are different from current
operation.
C. SHIFT CONDITIONS
Shift is allowed only when certain conditions for the vehicle are satisfied. This means that the
shift conditions must satisfy the operating conditions for 2 seconds before motor starts and 2
seconds of delay at initial stage is to diagnose the system.
▶The shift requirements are as follows:
- There should be no fault with battery voltage and shift motor for all shifts.
- Shift between 4H and 4L is operated only under the vehicle speed of below 43 Hz.
- There should be no fault with speed sensors.
- Transmission must be in neutral position (In case of manual transmission, the clutch
pedal should be depressed).
0-21
3670-03
CIRCUIT
RODIUS 2004.09