5 Series E60 525d (M57TU) SAL
Soft stop prevents the vehicle from jolting to a stop (e.g. with an inexperienced driver).
When the vehicle is braked to a standstill, there is no uncomfortable jerk (causing the occupants to "lurch"
forward). DSC calculates the moment that standstill can be expected from the current road speed and
deceleration.
Just before standstill is achieved, the brake pressure on the rear axle is reduced so that the vehicle stops with
practically no jerking.
Soft stop is only active for light braking, so that the shortest possible stopping distance can still be achieved in
emergency braking situations.
Start-off assistant
When pulling away on a slope, it is necessary to move your foot from the brake pedal to the accelerator pedal.
The start-off assistant prevents the vehicle from rolling downhill in the following situations:
•
uphill in forward gear
•
uphill in reverse gear
It does this by maintaining the brake pressure needed to hold the vehicle. The gradient is recorded by the
longitudinal-acceleration sensor in the DSC control unit.
The braking torque and engine torque needed is calculated from the gradient. When pulling away is detected,
brake pressure is reduced as soon as the available engine torque is sufficient to move the vehicle in the
direction required. The start-off assistant is deactivated when the parking brake is applied. If no move is made to
pull away within 2 seconds of the brake pedal being released, the start-off assistant will be deactivated.
Familiar functions for DSC:
DSC: Dynamic Stability Control
Dynamic Stability Control (DSC) detects the current status of the vehicle by evaluating the sensor signals.
This status is compared with the nominal values derived from a computational model.
In this way, the system recognises incipient instabilities.
The vehicle is stabilised as soon as a deviation overshoots the control threshold stored in the DSC control unit.
Stabilisation (within the limits imposed by the laws of physics) is achieved by reducing engine power and by
braking individual wheels.
DSC actions are superimposed on the ABS and ASC functions.
The DSC function can be deactivated by means of the DTC button.
ABS: Anti-lock braking system
The anti-lock braking system (ABS) stops the wheels locking during braking.
Advantage: Shorter stopping distances, the car retains its directional stability and remains steerable.
Brake pressure is regulated at all wheels to ensure that each wheel runs in the best possible slip range.
When this happens, slip is controlled so that the maximum possible braking and lateral stability forces can be
transmitted.
ABS alone is available for braking if a sensor for DSC fails or if a bus fault occurs (PT-CAN and chassis CAN).
ABS is the surviving safety function in circumstances in which DSC control is no longer possible.
EBV: Electronic brake force distribution
Electronic brake force distribution (EBV) is a component of the ABS. EBV regulates the brake force distribution
between the front and rear axles, depending on vehicle load.
Advantage: Regardless of the load state of the vehicle, the best possible braking distance is achieved while
SBT Dynamic Stability Control 8Plus E60, E61, E63, E64, E83, E90, E91, E92
BMW AG - TIS
12.02.2013 15:43
Issue status (12/2007) Valid only until next DVD is issued
Copyright
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