AUTOSAR Communication Design
PREEvision Use CasePREEvision – LDF, DBC, FIBEX, and ARXML Ethernet Communication
PREEvision supports the AUTOSAR compliant communication design for all bus systems, regardless of whether via CAN, CAN FD, LIN, FlexRay or Ethernet.
Advantages
- Support for CAN, CAN FD, LIN, FlexRay, and Ethernet
- System signal/data mapping of data elements to system signals
- Automatic creation of signals, data mappings, and signal routes
- Numerous routing options and delta state routing
- Support for the standard formats LDF, DBC, FIBEX, and ARXML
- Support for J1939, including ISO 11783 (ISOBUS)
- Support for SecOC and TLS
- Integration with other Vector tools
The Use Case
All physical signals on the network are defined on the communication layer. For this purpose, PREEvision supports CAN, LIN, FlexRay and Ethernet bus systems, which can also be modeled in mixed topologies in the main network diagram.
On the communication layer, the signals, PDUs, frames, and schedules if necessary are specified. Table editors and automations such as the signal router or the automatic generation of PDUs and frames are available for this purpose. For service-oriented architectures, PREEvision additionally supports Ethernet as the bus technology.
Functions / Features
Signal Mapping
The communication of data elements over a bus is represented in AUTOSAR by the system signal. In order to trace the alignment of these two elements, it is necessary to define a mapping link from the data element (software layer) to a system signal (communication layer). This is called data mapping in AUTOSAR.
Signal Router
Another important aspect in this phase of the system description is the definition of routes of individual system signals. The signal router supports the completion of the communication matrix.
It calculates the best route for the signals with the data elements to be transferred. Many communication artifacts are generated automatically by the signal router. In addition to many routing options and routing via delta states, all routed signals can also be displayed graphically in networking diagrams.
CAN (FD), LIN, and FlexRay
In order to transmit system signals over the bus, additional details must be defined. Each bus segment is configured dependent on its technology here. One component of this configuration is the PDU layout and frame layout. In this phase, signals are arranged in PDUs, which are in turn assigned to frames.
Other communication attributes are also specified, such as the data type, send mode, initial value, scheduling, network management, transport protocol etc. A special editor is available for creating and editing frames, PDUs and signals. Protocol-specific editors for CAN, CAN FD, LIN, FlexRay, and Ethernet are also available. For integration with additional tools, PREEvision supports the LDF, DBC and FIBEX formats in addition to AUTOSAR.
Partial Networking
With partial networking, parts of architectures can switch off temporarily to conserve available resources. For this purpose, clusters that can switch off and on and be monitored via control and status ports are defined in PREEvision.
Ethernet
Ethernet is being adopted as a bus technology in vehicles. PREEvision supports AUTOSAR compliant service and communication design for Ethernet communication in vehicles. The signal router can define VLANs and also calculate the communication path for defined VLANs.
J1939
PREEvision also supports CAN network protocol SAE J1939 for commercial vehicles, including ISO 11783 (ISOBUS) for agricultural machines.
ISOBUS enables uniform and easy control of different add-on equipment from the cab of the tractor. The expanded CAN multiplexing required here is supported.
Secured Communication
Due to safety-critical functions like autonomous driving, security for onboard communication is growing more and more important. PREEvision supports solutions like Secured Onboard Communication (SecOC) und Transport Layer Security (TLS). This allows the direct implementation of the safety goals in the model.
AUTOSAR Toolchain
PREEvision is a part of the Vector AUTOSAR tool chain and works with CANoe, DaVinci Developer and DaVinci Configurator Pro.
KNOW-HOW HIGHLIGHT
AUTOSAR Glossary
The AUTOSAR Classic software modules always in your pocket
This pocket-sized book compiles all important terms from the AUTOSAR Classic specifications 4.0 to 4.4 plus R19-11 (4.5).
VIDEO HIGHLIGHT
Model-Based E/E Development with PREEvision
From Architecture Design to Series Production
PREEvision offers a comprehensive modeling language to describe all aspects of E/E systems. All engineers involved in the development process find tailored diagrams and editors for their work. And all in one integrated tool. Communication designers define how software components exchange data across networks within the vehicle. PREEvision supports all relevant network technologies including CAN, LIN, FlexRay, and Ethernet.
Playing time 4:00 minutes, published 3/2018
