Bosch VCU, Manual

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Analog and Frequency Inputs | 11
Bosch Motorsport Vehicle_Control_Unit_VCU_Manual 49 / 136
11 Analog and Frequency Inputs
Analog inputs
– 0 to 5 V
– 12 bit A/D converter
– Switchable 3.01 kOhm pull-up resistor
– 10 kHz acquisition rate, up to 1 kHz recording rate
– Linear phase digital filter
Frequency inputs
– 5 V Hall-effect type, 2.5 V trigger level (DF11 input with current interface or 5 V Hall-
effect input with 2.5 V trigger level)
– 20 kHz max. frequency
– 10 ms measurement window
11.1 Analog inputs
11.1.1 Measurements channels
For each analog channel, several ‘subchannels’ are available.
Measurement labels with the characters ‘raw’ show the exact values in mV.
Measurement labels with the characters ‘_fi’ show filtered values.
The word ‘name’ in the table is a placeholder for the channel’s name.
Measurement label Function
raw_name mV value of sensor
raw_name_fi Filtered mV value of sensor
name Physical value of sensor
name_fi Filtered physical value
Filtered channels are routed through digital low pass filters:
– Vehicle Control Unit VCU uses A/D converter oversampling and digital filtering to re-
cording rate
– Digital filters eliminate ‘out-of-band’ noise
– Cut-off frequency automatically adjusted to recording rate
– Linear phase – no signal distortion
– Latency compensation – no filter delay in recorded data