Active Torque Transfer System Components

ATTS UNIT
The moment control unit is the right/left driving force distribution unit. If consists of a 3-series planetary gear, the right and led clutches, the oil pump, the linear solenoid valve, the right and left shim solenoid valves, the right and left oil pressure sensors, and the oil temperature sensor.

3-SERIES PLANETARY GEAR
The 3-series planetary gear is a set of planetary gears and a carrier with gear ratios that set the speed ratio between the right and left wheels at approximately 1.15. It is not equipped with a ring gear but features a 3-phase parallel layout with a sun gear and a planetary gear.

RIGHT/LEFT CLUTCH
The right and led clutches are a plate-fixing wet multi-plate clutch. They are a pair of clutches that fixes the 3-series planetary gear carrier (when turning to right) or the led central gear (when turning to left) to distribute the torque to the right and led wheels.

OIL PUMP
The oil pump is driven by the led driveshaft. It is a trochoid pump located above the oil level to prevent cavitation caused by air trapped by the oil pump drive gear, and it is designed to produce oil pressure to control the right and left wheels and to feed pressurized lubrication oil to each part.

LINEAR SOLENOID VALVE
The linear solenoid valve regulates the primarily controlled oil pressure from the oil pump to the adequate pressure in accordance with the driving torque, that is distributed to the right and led wheels.

RIGHT/LEFT SHIFT SOLENOID VALVE
The right and led shift solenoid valves are provided for the right and left clutches. They are designed to select the 3-series planetary gear fixing shaft for deceleration, and they supply the oil pressure governed by the linear solenoid valve to the clutch by turning ON or OFF.

RIGHT/LEFT OIL PRESSURE SENSOR
The right and left oil pressure sensors are in the right and left clutch oil lines. After detecting the oil pressure, the sensors transmit the signal to the ATTS control unit.

OIL TEMPERATURE SENSOR
After detecting the ATF temperature in the ATTS unit, the oil temperature sensor transmits the signal to the ATTS control unit.