Auxiliary systems (BMW 7 Series E38)

ASC+T/DSC

Sensors on the wheels determine their angular velocities. On this basis, the control system draws a conclusion about the slippage of the drive wheels. Depending on the road conditions, two adjustment mechanisms are used. In the case of a large excess of power and, consequently, slippage of the drive wheels, the engine torque is reduced. In addition to this, and without the driver's intervention, automatic braking of the slipping drive wheel is performed. This achieves an effect comparable to the effect of an adjustable limited-slip differential. Such braking is possible at a speed of up to 40 km/h. At a speed above 40 km/h, but not more than 100 km/h, braking of lesser intensity is used to increase traction.

EDC

The regulator, installed on the rear axle, ensures constant ground clearance under any vehicle load.

For this purpose, pneumatic shock absorbers are installed on the rear axle instead of conventional shock absorbers and steel springs. The electronic control system determines the actual height of the body above the road using two sensors and, if necessary, connects a compressor that pumps compressed air into the struts.

By increasing pressure with increasing load, the regulator not only ensures constant ground clearance, but also comfortable shock absorption when driving, regardless of the vehicle load.