On May 27th, Broadcom presented a vehicle Ethernet demonstration system (Demo) to a number of media, and based on the system, explained the related technologies and future development prospects of the vehicle Ethernet. The system can simulate the working principle and signal transmission process of car Ethernet in the car, so that we can more clearly understand how Ethernet implements various functions in the car.
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The main function of the demo system: entertainment information and security
According to Mr. Tim Lau, deputy director of the automotive network product line of Broadcom's Infrastructure and Network Division, the black box in the upper left corner of the demonstration system is used to store information, which is equivalent to the Head Unit in the car. The video signal is transmitted to the display via Ethernet, and the sound is transmitted over Ethernet and output from the speaker via a digital amplifier and analog system. The camera is powered by Ethernet and the system chip can monitor the signal and transmit it to the display via Ethernet.
In the demonstration system, the same pair of unshielded twisted pairs have both power and signal, and the two lines can transmit both digital signals and Power over Ethernet (POE).
The camera in the demonstration system is equivalent to the camera in the parking assist system. The BMW X5, which already uses Broadcom Ethernet technology, has four such cameras, which is the basis for further autopilot.
Advances in transmission media: twisted pair to achieve "car lightweight"
In terms of the weight of the car itself, in addition to the weight of the car and the engine, the weight of the harness system is the third in the car. Compared with the traditional CAN, LVDS, and LIN bus in-vehicle networks, the car Ethernet uses twisted pair transmission, and its wiring weight is 30% lighter than that of the LVDS network, and the cost can be saved by 80%.
In the future, the bandwidth required for in-vehicle communication is getting higher and higher. The traditional MOST bus cannot meet the requirements. The migration from 100M, Gigabit to 40G, and 100G can only be realized by Ethernet.
Some people have such a question. The traditional thick data line uses an anti-electromagnetic interference insulation design, and the twisted pair is so thin, how does it handle electromagnetic interference? In this regard, Broadcom said that the strength of electromagnetic interference is mainly Depending on the frequency at which the signal is transmitted, the conventional technology transmits frequencies up to several hundred megahertz, and insulation must be used to prevent interference. Broadcom's Ethernet has a low frequency during signal transmission, so there is no such problem.
Car Ethernet increases interoperability between systems
When a new technology is launched, it will always lead to various questions. Some people must be concerned about the benefits of car Ethernet in addition to reducing weight and improving fuel economy.
For example, the camera system in a traditional car may use a CAN bus, while the entertainment system may be a MOST bus. The two systems operate independently and have no connection. With the car Ethernet, such as Broadcom's BroadR-Reach technology, there will be a central centralized control device in the system, so that the entertainment information system and the security system cooperate with each other. For example, when a driver wants to turn or change lanes, the information detected by the security system can be broadcasted through the entertainment information system.
In addition, Broadcom also pointed out that the application of Ethernet technology in the ADAS system has been successful, and the next step is to apply it to the entertainment information system.
Redundant backup ensures system stability
So, since the future systems are closely related to each other, will the entire cycle collapse if something goes wrong? To address this issue, Tim Lau explains: "Whether it is traditional technology or our BroadR-Reach The most critical issue is backup. The technical advantage of Broadcom is that there is a problem with the system, and it will immediately alarm." In addition, when there is a problem with one transmission line, another backup channel will intervene, which is called "redundancy." Backup". In this way, the data can still be successfully transmitted.
Popularization challenges
Despite its many advantages, the promotion of in-vehicle Ethernet will not be smooth. A car is designed for a period of 4-5 years, and a car may sell for 5-10 years. The automotive industry is a conservative industry, and unless the car companies have a strong sense of innovation, the car Ethernet will not be widely popular in the near future. Broadcom expects that by 2017 and 2018, automotive Ethernet applications will see high growth.
As a member of the Open Alliance Alliance, Future Broadcom will cooperate with other members to build a complete automotive ecosystem based on the BroadR-Reach solution by adding MCUs and CPUs.
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