Bosch DDU 8 Manual page 86

10 | Analog and Frequency Inputs
10.5.1
10.5.2
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Channels
available in
Computed
Sources
Available
measurements
for channel
Special functionality: vehicle speed
This functionality allows:
▪ high performance vehicle owners to measure wheel spin under acceleration
and wheel slip/lock under braking.
▪ calculating vehicle 'speed over ground'.
Vehicle speed calculation function
▪ Calculating vehicle speed of 2 wheel drive: (Wheel speeds of non‐driven axle
as input)
Calculated speed is average of both speeds if speed difference between
wheels < limit.
Calculated speed is maximum of both speeds if speed difference between
wheels > limit.
▪ Calculating vehicle speed of 4 wheel drive: (Wheel speeds of all wheels as in‐
put)
Calculated speed is speed of 2nd fastest wheel.
Setting up calculated speed
1. Click on tab 'System Overview'.
2. Click on 'Measurement Sources' in the Toolbox.
3. Drag the 'Speed' computed source from the Toolbox and drop it on 'Compu‐
ted Channels' in the DDU 8 Project Tree. Do not drop it on 'DDU 8'!
DDU 8 Manual
Calculation of hysteresis
channel
Bosch Motorsport