3) Secondary wet friction clutch

The apply force from the Apply Cam compresses the Secondary Clutch and it increases the frictional force between inner plates which is splined with a Input Shaft and outer plates which is splined to a Clutch Housing. The more frictional force generates the higher output torque.

4. Inputs and outputs

* CAN (Controller Area Network)

1. S TEERING ANGLE SENSOR (Refer to ESP section for detailed information)

Steering angle signals of the vehicle with ESP (Electronic Stability Program) come to the ITMCM through the CAN BUS line. However without ESP, steering angle signals directly come to the ITMCM from the sensor side. With the steering angle information, the ITMCM detects the amount of steering and it controls the EMC coil current to prevent torque conflict between the front wheels and the rear wheels.

2. WHEEL SPEED SENSOR (Refer to ESP section for detailed information)

W heel speed sensor signals of the vehicle with ABS/TCS, ESP come to the ITMCM through the CAN BUS line. However vehicle with a conventional brake system, wheel speed signals directly come to the ITMCM from the sensor side. 4WD system always comes with ABS/TCS, ESP or conventional brake system not with ABS only.

ITMCM varies the EMC current by the Information of the speed difference between the front wheels and the rear wheels.

For example, if the speed difference is high, more EMC current is applied by the ITMCM to reduce the speed gap.

• Front wheel speed = (FL Wheel Speed + FR Wheel Speed) / 2

• Rear wheel speed = (RL Wheel Speed + RR Wheel Speed) / 2

3. ABS ACTIVE SIGNAL

Vehicle is in ABS control, ITMCM does not control the EMC current. Vehicle condition is in 2WD state.

4. TPS

TPS information comes from the ECM through the CAN BUS line. TPS is an input torque data. TPS angle suddenly increases, then the applied current to an EMC goes up. Therefore the torque distribution to rear wheels goes up.

5. 4WD LOCK SWITCH

T his switch is selected 4WD LOCK lamp comes on. The ITMCM applies maximum current to the EMC resulting in 50 to 50 torque distribution.

6. EMC (Electro Magnetic Clutch)

The ITMCM varies the applied current to the EMC to make a torque distribution to the rear wheels. The EMC current increases then the magnetic force increases. Stronger magnetic force results in higher pressing force to secondary clutch.

7. 4WD WARNING LAMP

4WD warning lamp blinks (2Hz) when a system failure is detected.