By Robert Bosch
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Extra resources for Driving Stability Systems
Drive axle speed controller The drive axle speed υKar or the drive torque MKar can be influenced by means of engine interventions. Symmetric brake applications also influence the drive axle speed υKar and effect torque balance between the individual wheels in the same way as reducing the drive torque MKar. The drive axle speed controller is used to regulate the drive axle speed in this way. Transversal differential lock controller Asymmetric brake application (brake application at just one driven wheel) is used primarily to regulate the differential speed at the driven axle υDif = υL – υR.
4 Index 1: non-driven wheel Index 2: driven wheel (in this example, the wheel moment of inertia is increased by a factor of 4) (–a) Threshold for wheel deceleration M Torque difference MB – MR Robert Bosch GmbH 36 Antilock braking system Typical control cycles Control cycle on surfaces with good grip (High coefficient of friction) If the ABS sequence is activated on a road surface with good grip (high coefficient of friction), the subsequent pressure rise must be 5 to 10 times slower than in the initial braking phase in order to prevent undesirable suspension vibration.
1 æ UFB0290-1E 4 Typical control cycles 39 Control cycle with yaw-moment buildup delay When the brakes are applied in situations where the grip conditions differ significantly between individual wheels (“µ-split” conditions) – for example, if the wheels on one side of the car are on dry tarmac while those on the other side are on ice – vastly different braking forces will be produced at the front wheels (Fig. 4). That difference in braking force creates a turning force (yaw moment) around the vehicle’s vertical axis.