SsangYong Stavic / SsangYong Rodius (2005 year). Manual - part 354

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TOD

STAVIC - 2004.09

4D

Etc

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
87 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.

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Shifting Sequence

Flow chart

Yes

Yes

Is the position

code valid and

sequential?

Does the motor

operate for

maximum limit?

Shift

requirements

Check shift

conditions

Satisfied shift

conditions for 2

seconds

Analyzing position

encoder

Is the position

code valid?

Move further to

requested direction

Reached at

target location?

Shift motor OFF

Completed

Canceling general encoder

DTC Shift is not available

during ignition cycle

Motor stops Shift

time out DTC

Moto stops

General

encoder DTC

Motor ON to L-H

during maximum limit

Shift is not available

during ignition cycle

Yes

Yes

Yes

Yes

No

No

No

No

No

No

Start

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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.

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).

Reading position encoder

The position encoder is the code that TCCU can determine the shift motor position.

1

1

1

0

0

1

1

0

0

0

1

3

1

1

1

0

0

0

0

0

0

1

Left Stop

Left top

Top

Right top

Zone 1

Neutral

Zone 2

Bottom

Right stop

Off State

Input voltage

1 : above 4.5V (HIGH)

0 : below 0.5V (LOW)

2

1

0

0

0

0

0

0

1

1

1

4

0

0

0

0

0

1

1

1

0

1

Motor Position

Remark

Position

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3. SPEED SENSOR AND CLUTCH COIL

The front and rear speed sensor utilizes the hall effect. These sensors generate 0V and 5V of square type digital
wave according to the rotation of the wheel with teeth of transfer case front and rear output shaft. The speed
signal from front and rear propeller shaft is entered into TOD control unit.

Pin

4

6, 7

1, 2, 5

3

Function

Clutch coil

Sensor power supply (5V)

Sensor signal

Sensor ground

2(G)

5(Sb)

7(Gr/R)

1(G)

3(B)

6(Gr/R)

4(Br)