Bus Connections

The sensors for Active Blind Spot Detection are connected with two bus systems:

• The master (SWW) is connected to the FlexRay and to the local CAN.
• The SWW2 radar sensor is only connected with the local CAN.

The SWW2 uses the local CAN to transmit the data of all of the road users it has detected to the master. The sensors also utilize the local CAN to exchange internal system status and control signals.

The local CAN is physically set up like the PTCAN and therefore works at a bit rate of 500 kBit/s. Master and SWW2 each have one of the two terminal resistors, each with 120 Ω.

The FlexRay represents the interface between the sensors and the whole vehicle. In this way, the sensors, or to be exact, the master sensor, receives the data about the state of motion of the vehicle (e.g. the road speed and yaw rate).

The master uses this interface to send information about whether the necessity for a warning exists to the ICM control unit.

The FlexRay is routed to the master and is fitted there with a terminating resistor. The master is therefore a terminal node in the FlexRay network.

A detailed description of new features in the FlexRay network can be found in the F01/F02. bus systems training material in ICP and TIS.