X Series E83 X3 2.5Si (N52K) OFFRD
driving stability is maintained. The brake pads wear more evenly.
If the ABS fails, the EBV function is sustained for as long as possible.
The signals from at least two wheel-speed sensors are needed for the EBV function.
CBC: Cornering brake control
Cornering brake control (CBC) is an extension of ABS. CBC increases driving stability when the brakes are
applied as the car corners ("cornering logic").
Advantage: Optimum driving stability if brakes are partially applied when cornering.
The shift in wheel loads as the car corners (the onset of this phenomenon requires no more than light
application of the brakes) can result in a reduction in handling stability. If required, CBC generates a stabilising
load moment when the brakes are applied lightly outside the ABS intervention range.
DTC: Dynamic traction control
DTC is a version of DSC that has been optimised for forward momentum in certain road conditions.
Dynamic traction control (DTC) offers better traction as a trade-off against a reduction in stability in some
circumstances. Consequently, its use should be reserved for exceptional conditions. It is advisable to briefly
activate DTC in the following exceptional circumstances:
•
To rock the vehicle free or pull away in deep snow or on a loose surface.
•
When driving on snowy uphill stretches, in slush and on roads that have not been cleared
•
When driving with snow chains.
The DTC function approximates to that of DSC with a slightly modified control strategy.
DTC can be activated by deactivating DSC (DTC button). DTC intervenes in the braking actions to imitate the
function of a conventional differential lock. This effect of this is to increase the input torque on those wheels that
are on a higher-friction surface.
Advantage: Higher traction is available with DTC.
Vehicle stabilisation intervention (e.g. reduced power output) is made slightly later than with DSC. In certain
situation, the driver has to intervene more intensively himself to stabilise the vehicle.
ASC: Automatic stability control
Automatic stability control (ASC) prevents the wheels spinning during acceleration by intervention in brake and
engine operations.
Advantage: More traction and better driving stability.
If the wheels on the driven axle have a different level of grip, the wheel that tends to spin is braked. If necessary,
the engine's power output is also reduced.
MSR: Engine drag torque control
The engine drag torque control (MSR) counteracts the tendency of the wheels to lock on smooth surfaces. The
engine's drag torque generated by downshifts or abrupt load changes can lock the driven wheels (especially on
surfaces with a low coefficient of friction).
The wheel-speed sensors tell MSR as soon as the wheels are about to lock. MSR then briefly reduces the
engine's drag torque by opening the throttle slightly.
Advantage: The drive wheels retain their lateral stability in overrun mode.
DBC: Dynamic brake control
Dynamic brake control (DBC) assists in emergency braking situations by automatically increasing the brake
pressure.
SBT Dynamic Stability Control 8Plus E60, E61, E63, E64, E83, E90, E91, E92
BMW AG - TIS
12.02.2013 10:20
Issue status (12/2007) Valid only until next DVD is issued
Copyright
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