Car2X
Communication is essential for interpersonal interaction and collaboration, but meanwhile it is also becoming increasingly important in technical areas. The communication of connected plants and systems within Industry 4.0 leads to greater efficiency, speed and performance in production. Communication is also no longer a foreign word in the automotive industry. Car-to-X communication of vehicles is increasingly becoming a focus within developments, where vehicles communicate with each other and with their environment, such as traffic lights. On the one hand, a key objective is road safety since the vehicle detects important, even vital information from its environment much faster than the driver himself and is able to react automatically and warn following vehicles at the same time. On the other hand, Car-to-X also contributes to an improved regulation of traffic density in inner cities, as vehicles and infrastructure are able to detect each other and better synchronize with each other. In the future, this holistic connectivity can contribute significantly to the improvement of traffic flow and fuel savings as well as traffic safety in cities.
Development of Demonstrators for Car-to-X Simulation
As part of student work, demonstrators for CANoe simulations of Car-to-X communication are being developed in this project. The demonstration will use scenarios of realistic traffic situations to verify and illustrate vehicle communication. In this context, vehicles shall detect dangerous traffic situations and send warning messages to following vehicles. Here, a general classification is made between two Car-to-X message types: event-driven messages (Decentralized Environmental Notification Messages, or DENM) and continuous messages (Cooperative Awareness Messages, or CAM).
Learn more about our virtual automotive simulations.
Hardware & Software of the CANoe Simulation
The simulation of the Car-to-X communication network of the vehicles and components involved is implemented with Vector's CANoe software. Virtual and real ECUs can be implemented in the simulation setup and can be controlled externally via an interface. Two VN4610 devices from Vector are used as the interface (control panel) for visualizing Car-to-X communication. These devices have two ports, USB and high-speed CAN FD, and can be connected to the computer and CAN bus. The demonstrator is developed using the CANoe.Car2x software extension, which was specially designed for the development of traffic scenarios.
Demonstrator Setup
Within a so-called scenario editor in CANoe.Car2x, the routes of the vehicles as well as their specific data for speed, etc. can be defined in a time-based manner. A network explorer and a setup are further used to configure more specific data such as vehicle width and length, vehicle type such as emergency vehicle, etc., as well as message formats and ECUs. For data encryption, certificates can be generated, which are assigned to the corresponding network components in the Network Explorer. Finally, a scenario manager is used to link the created scenario to the network.
Traffic Scenario of the Demonstrators
In order to demonstrate Car-to-X, two demonstrators with virtual and real control units and corresponding interfaces were developed in a student project, each using the same traffic scenario. As for a dangerous traffic situation, two vehicles driving one behind the other approach an intersection where right before left applies and are surprised by an emergency vehicle with flashing lights and sirens from the left. The vehicles are informed about the siren signal via Car-to-X. The vehicle in front them performs an emergency braking maneuver and sends the warning signals via Car-to-X to the vehicle behind, which also sends the emergency information to the surrounding area. The installed interfaces (incl. warning lights) are used here to visualize the messages received.
Objective
The project enables students to deepen their knowledge in the field of Car-to-X in a practical and demonstrative way. The demonstrator can be extended by the following work:
- Traffic light communication
- further critical traffic scenarios, if necessary with more road users
- extension to a virtual Car-to-X test field to verify the overall traffic behavior
- Your further ideas
Key data
Karlsruhe
Institute of Energy Efficient Mobility (IEEM)
Moltkestr. 30
76133 Karlsruhe
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Institute of Energy Efficient Mobility (IEEM)
Postfach 2440
76012 Karlsruhe