9 | Project Configuration
36/136 Vehicle_Control_Unit_VCU_Manual Bosch Motorsport
9.5 CPU Load Limits
As all microprocessors, the two processors of the Vehicle Control Unit VCU have limited
capacities. The current load of the processors can be monitored using the channel
“cpu_load_001” or “cpu_load_002”. When configuring your device, please make sure the
used CPU load is in a save range below 100 %.
Bosch recommends a maximum CPU load of 85 % (averaged). Exceeding this limit might
result in the Vehicle Control Unit VCU not being able to fulfill its required measuring/log-
ging/display tasks or even in crashing and rebooting.
Main factors influencing the CPU load are:
– Number and complexity of math channels
– Number and complexity of conditions
– CAN traffic on both CAN lines
– Display configuration, especially displaying pictures
– Logger configuration (total logging rate [kB/s], conditional measurement rates)
To help respecting the limit of 85 % CPU load, the Vehicle Control Unit VCU creates an er-
ror memory entry. To trigger this error entry, the CPU load must exceed the limit for 5
minutes without interruption.
When being confronted with this error memory entry (see ‘Error info’ in RaceCon) or when
being confronted with Vehicle Control Unit VCU resets due to complex configuration
setups, please consider reducing the demands on the Vehicle Control Unit VCU adapting
the influencing factors mentioned above.
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