5 Series E60 M5 (S85) SAL
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Brake pressure
The measured values available are used to calculate how the car is moving at any given instant. This actual condition
is compared to the nominal values calculated in the DSC control unit.
If the actual status deviates from the nominal values the DSC system goes active and intervenes in the braking
system or the engine management system, as applicable.
The advantages:
The intervention of DSC in the engine control and brakes provides outstanding driving stability and traction in all
driving situations. DSC combats negative, dynamic driving forces. This means DSC brings about maximum active
safety within the physical limits. DSC thus enhances driving comfort by allowing more relaxed driving.
Brief description of components
Dynamic Stability Control (DSC) comprises the following components:
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DSC unit
The DSC unit can be broken down into the components of DSC control unit and hydraulic unit.
The DSC control unit regulates the pressure in the brake system via the hydraulic unit (comprises valve block
and pump motor).
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4 wheel speed sensors
Each of the wheel speed sensors registers the speed of an individual wheel. In addition, the wheel speed
sensors recognise the direction of rotation (forwards or backwards)
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DSC sensor
The DSC sensor measures the rotation of the vehicle around the vertical axis (yaw rate) and the lateral
acceleration of the vehicle. A car fitted with Active Steering has two DSC sensors (redundancy). The DSC
sensors are connected to the DSC and AS control units via the chassis CAN.
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Steering-angle sensor
The steering-angle sensor detects the movements of the steering wheel. The steering-angle sensor is part of the
steering column switch cluster (SZL).
On vehicles with Active Steering, the cumulative steering angle is measured by the cumulative steering angle
sensor (= steering angle at steering gear output).
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Internal brake pressure sensor
The DSC unit incorporates a brake-pressure sensor. This brake pressure sensor registers the braking pressure
applied by the brake pedal and the brake booster.
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2 additional brake pressure sensors (only in combination with Active Cruise Control, ACC)
Two more brake pressure sensors are integrated, one in the front brake circuit and one in the rear brake circuit.
A car fitted with Active Cruise Control (ACC) is slowed by DSC when necessary. The braking pressure applied in
this way at the front and rear wheels is often very low. It is controlled by means of the brake pressure sensors
(objective: to equalise the brake load at the front and rear axles on long downhill stretches).
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2 brake pad wear sensors
The brake pad wear sensors (front left and rear right) monitor the thickness of the brake pads. The Condition
Based Service indicator (CBS) in the instrument cluster lights up if brake pad wear progresses to the point at
which it becomes critical.
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Brake light switch
SBT Dynamic Stability Control DSC 8 E60, E61, E63, E64
BMW AG - TIS
23.02.2013 19:56
Issue status (12/2007) Valid only until next DVD is issued
Copyright
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