ACD - Active Central Differential

It was introduced for the first time on Jannuary 2001, with the incoming of the Lancer EVO VII, Mitsubishi/RALLIART made another step ahead, in comparison with all its rivals. The new electronic differential, replaces the former central LSD, it is nothing else then an intelligent torque transfer differential for two axels, front and rear.

ACD shares with AYC the sensors, it is made of an electronic and an electrohydraulic part.

Electronic section:

- longitudinal acceleration sensor

- lateral acceleration sensor

- angle sensor steering wheel

- wheels rotational speed sensor

- throttle opening sensor

- ECU

Mechanic section:

- multiplate clutch with electrohydraulic actuator

Sampling a few informations from the sensors, the ECU controls the behaviour of the car and puts into practice what the builder of the software suggests to maintain the car on the correct trajectory.

The ACD has three positions of torque transfer (they will be electronically regulated for every position):

- Tarmac (Tarmac)

- Gravel (Gravel/Wet)

- Snow (Snow/Ice)

To switch over on one of the three positions, ACD transfers the torque on the rear or front axel, so that the stability of the car is absolute on any ground.