Introduction to Bus Simulation

Numerous bus systems form the information backbone of today’s vehicles and their ECU communication. On the way from assisted to highly and fully automated driving, the importance of network infrastructure will increase drastically. Already, more than 10,000 different information signals are exchanged between up to 100 ECUs in today’s vehicles. Parts of these signals are distributed by established bus systems like CAN, FlexRay, and LIN. But to fulfil the increasing requirements, they will be supplemented by CAN FD and, especially, Ethernet.

Since each bus system and network communication comes with different data rates and implementation costs per node, users need to thoroughly consider which system to use. 

Comparison of different vehicle networks

Since the bus and network ports are the main interfaces of the ECUs, it is nearly impossible to validate ECU functionality without bus simulation. Tests of ECU networks where not all the necessary ECUs are available are called restbus simulation. Here, the simulator emulates the missing bus nodes.

dSPACE provides a complete set of tailored hardware and software to execute restbus simulations in a very convenient and efficient way throughout the whole development and testing process.

For example, SCALEXIO, the dSPACE hardware-in-the-loop (HIL) simulator, is able to simulate complex models and buses under real-time conditions. A large number of bus and network interfaces are available for this high-performance dSPACE platform.

In earlier development stages, dSPACE VEOS provides a PC-based simulation platform for validating the software of ECUs, including their communication. These early tests increase the software quality and thus lead to more efficient HIL tests.

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