Many people will be very surprised, is autopilot and Ethernet very important? If this problem is in the previous years, I may not be able to answer you with certainty; but at present, whether it is to focus on the domestic or international, the car Ethernet will soon dominate; the following picture is a vehicle communication The prediction curve of the way.
This table has been on the major websites for a long time, the 2017 data is previously predicted; according to incomplete statistics, and the actual number of Ethernet nodes in the OEM. This also indicates that Ethernet will dominate the mainstream of vehicle communication in 2020. The growing demand for Ethernet is driven by bandwidth requirements, media streaming and audio as a cause, and ADAS controllers are also a major cause.
So how do you introduce Ethernet for your home and office environment into your car? Can't all controllers be equipped with one host? This is impossible, and it is not allowed in terms of weight. Therefore, if the vehicle introduces Ethernet, it needs to be adjusted. It is known that the RJ45 has a total of 4 pairs of twisted pairs. In the half-duplex state, only two pairs are used, and full-duplex requires four pairs. The OPEN Alliance and IEEE were the first to change it. The OPEN Alliance introduced an Ethernet connection that only requires a pair of twisted pairs - BroadR-Reach/100BASE-T1, which is only slightly different.
After solving the hardware problem, it is necessary to face the incompatibility of the protocol; as the official protocol maker of Ethernet, IEEE has gradually improved the content of the TSN agreement last year and this year to adapt to the possibility of automatic driving. The transmission of audio and video streams. Because with the increase of the automatic driving level, the number of pixels and frames of the camera will inevitably increase, and the author mentions that the amount of data in LIDAR is not small in the previous article.
Based on the original Ethernet protocol, the UDP, TCP, IP protocol and data link layers except for the TSN part can be extended. SOME/IP and DOIP, which are specially applied in the vehicle environment, have been formed for some time. The content of many data link layers of TSN needs to be redefined, and the content of the agreement will be completed by 2020.
For security, there are a lot of things to talk about, but there is not much to explain here; and the security of vehicle Ethernet in China is just getting started. For the various security attacks of controllers and vehicle networks, the OEMs are obviously not doing enough. I hope that this test manufacturer should not be sloppy, otherwise it will pay a price.
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