| Popis: |
Ethernet is the emerging technology for automotive networking. With data rates of 1GBit/s and more, Ethernet can enable new car functions and services. Leading car manufacturers and system suppliers have started introducing Ethernet to cars for advanced driver assistance systems (ADAS) like object tracking and surround-view, and they added connectivity of consumer devices such as phones, music players, etc.. Currently, car manufacturers world-wide assess new concepts that let us use a single switched Ethernet network for streaming, connectivity, and control data at the same time, with the (technical) potential of replacing CAN and FlexRay in all domains some day.This introduction of Ethernet into the existing CAN/FlexRay/MOST-dominated E/E architectures creates obvious new challenges. One top-priority requirement is the early analyzability of their real-time capability. This comes as no surprise as analyzing the real-time performance of CAN and FlexRay is a standard step in network design today. It tells us upfront, whether a planned network configuration will satisfy the real-time requirements (using metrics such as bus load, signal latency, etc.); and it points us to bottlenecks so we can fix them in early design phases. The whole aspect of “real- time” has become a must-have in network design within the last 5 years.In this paper, we present different load and latency metrics for assessing real-time metrics for automotive Ethernet networks, and we demonstrate how these metrics help optimizing Ethernet configurations on a representative use case. |
