Control unit works
in three different driving ranges .
1 .Traction while moving off
2.Acceleration from driving in curves
3.Ferraria effect (accelerator pedal released in curve)
1 . Traction While Moving Off
Pressure depending on wheel acceleration is built up in the transverse lock when the control unit recognizes slip of a wheel through comparison of the wheel speed values . System pressure Is increased in steps, until the slipping wheel again rotates in the permitted speed range, and then held constant for a predetermined minimum time . Pressure buildup depends on wheel acceleration, in other words the pressure will rise faster when wheel acceleration is fast . The pressure Is dropped in small steps .
2. Traction Regulation for Driving in Curves with High Transverse Acceleration
The driven wheel on the inside of a curve tends ,to slip and propulsion is reduced when driving in curves with high transverse acceleration . A locking torque depending on the vehicle's transverse acceleration, road speed and recognized curve is introduced to prevent this . Locking torque Is lower with a high road speed and high transverse acceleration than with a low road speed. If cornering stability (lateral control) worsens by way of example due to a change in the road surface condition (change from non-skidding to slippery surface), this will be recognized from the rear axle wheel speed values and locking torque will be reduced very quickly in order to prevent load type
oversteering due to locking . This function is effective in the entire speed range above 25 km/h (16 mph) .
3. Ferraria Effect
Rear wheel driven cars tend to oversteer when the accelerator pedal Is released suddenly while driving in a curve . This oversteering tendency can be reduced considerably through application of correct transverse locking torque . This function Is activated by transverse acceleration input information with rightfleft curve identification and a comparison of wheel speed (wheels on inside and outside of a curve) . The amount of locking torque required Is determined by the road speed, transverse acceleration
and speed of wheels. Locking torque is reduced in steps as soon as the car is accelerated again or the brakes are operated, or the activating conditions no longer exist .
The function of ferraria effect works in the entire speed range from 60 km/h (31 mph) on .