i-ACTIV AWD SYSTEM

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Outline

•  The electronic all-wheel drive (AWD) control system (i-ACTIV AWD) automatically and optimally controls drive torque distribution for the front and rear wheels. Due to this off-road mobility and driving stability are improved.
•  Based on the input signals from each sensor, the PCM determines vehicle driving and road conditions, and controls output current to the electronic control coupling (AWD solenoid) inside the rear differential. This control allows for optimal distribution of the drive torque from the engine to the rear wheels.
•  Actual fuel economy similar to the 2WD has been realized by minimizing energy loss for the entire i-ACTIV AWD system.
•  AWD control is performed while coordinating with the G-vectoring control plus. Due to this, handling stability during cornering has been improved. (See G-VECTORING CONTROL PLUS (GVC PLUS) [SKYACTIV-G 2.0].)
•  The off-road traction assist has been adopted to achieve the road handling ability if diagonally opposed wheels lose contact with the ground.

Structural View

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Structure

•  Consists of the following parts:

Electronic control coupling AWD solenoid coupling
Temperature sensor (Built into electronic control coupling)
(See ELECTRONIC CONTROL COUPLING.)
Differential oil temperature sensor
(See DIFFERENTIAL OIL TEMPERATURE SENSOR.)
PCM
(See PCM [SKYACTIV-G 2.0].)
AWD warning light
(See AWD WARNING LIGHT.)
TCM
(See TCM [ET6A-EL, ET6AX-EL].)
Electronically controlled brake unit
(See ELECTRONICALLY CONTROLLED BRAKE UNIT.)
EPS control module
(See ELECTRIC POWER STEERING (EPS) CONTROL MODULE.)
ESU
(See ELECTRICAL SUPPLY UNIT (ESU).)


System Diagram

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Features

•  The PCM calculates the optimum transmission torque to the rear wheels based on the following input signals, and the ESU outputs control current to the electronic control coupling (AWD solenoid) based on the calculation result.
•  The module controls the current outputted to the AWD solenoid by changing the rate of the ON/OFF timing.

Signal output part

Signal name

Note
TCM
Selector lever position
Gear position
Transmitted as a CAN signal
Electronically controlled brake unit
Four-wheel speed
Brake fluid pressure
Coupling torque request
Parking brake position
EPS control module
Steering angle/steering angle sensor condition
EPS status
ESU
Rear differential oil temperature
Electronic control coupling tempetarure


Operation

•  For the operation content of the i-ACTIV AWD system, refer to the [AWD CONTROL]. (See AWD CONTROL [SKYACTIV-G 2.0].)