System Description

SYSTEM

AWD SYSTEM : System Description

- Pressing force of multiple disc clutch is controlled by electric control. Driving torque distribution of front and rear wheels changes automatically between approximately 0 : 100 (Rear wheel drive) and 50 : 50 (AWD) to have an optimized torque distribution adapted to road condition change.
- In accordance with fail-safe function, when system is malfunctioning, AWD control stops, and the system becomes rear wheel drive. Refer to "AWD SYSTEM : Fail-safe" Fail Safe.
- When a high load status continues for electric controlled coupling, AWD control temporarily becomes rear wheel drive, according to protection function. Refer to "AWD SYSTEM : Protection Function" Protection Function.

SYSTEM DIAGRAM







INPUT/OUTPUT SIGNAL

It transmits/receives each signal from the following control unit via CAN communication line.






OPERATION CHARACTERISTIC

VEHICLE STARTS CONTROL





- At the start, torque distribution for front and rear wheels is fixed by electric control and stable start is achieved.
- Makes possible stable driving, with no wheel spin, on snowy roads or other slippery surfaces.
NORMAL CONTROL
- On roads which do not require AWD, it contributes to improved fuel economy by driving in conditions close to rear-wheel drive and it results in better fuel efficiency and provides FR-like steering characteristics.
- When spin occurs on rear wheel, distribute optimum torque to front wheel and keep stable driving.
- The vehicle cornering status is judged according to information from each sensor, and the optimum torque is distributed to front wheels for preventing tight cornering/braking symptom.

AWD WARNING LAMP INDICATION CONDITION

- Turns ON when there is a malfunction in AWD system. AWD warning lamp indicates the vehicle is in fail-safe mode.
- Also turns ON when ignition switch is turned ON, for the purpose of lamp check. Turns OFF approximately for 1 second after the engine starts if system is normal.
AWD WARNING LAMP INDICATION






CAUTION:
AWD warning lamp also turns ON due to data reception error, CAN communication error etc.