The next wave of cars may use Ethernet
- 28 February, 2014 22:03
The most ubiquitous local area networking technology used by big business may be packing its bags for a road trip.
As in-vehicle electronics become more sophisticated to support autonomous driving, cameras, and infotainment systems, Ethernet has become a top contender for connecting them.
For example, the BMW X5 automobile, released last year, used single-pair twisted wire, 100Mbps Ethernet to connect its driver-assistance cameras.
Paris-based Parrot, which supplies mobile accessories to automakers BMW, Hyundai and others, has developed in-car Ethernet. Its first Ethernet-connected systems could hit the market as soon as 2015, says Eric Riyahi, executive vice president of global operations.
Parrot's new Ethernet-based Audio Video Bridging (AVB) technology uses Broadcom's BroadR-Reach automotive Ethernet controller chips.
The AVB technology's network management capabilities allows automakers to control the timing of data streams between specific network nodes in a vehicle and controls the bandwidth in order to manage competing data traffic.
Ethernet's bandwidth could provide drivers with turn-by-turn navigation while a front-seat passenger streams music from the Internet, and each back-seat passenger watches streaming videos on separate displays.
"In-car Ethernet is seen as a very promising way to provide the needed bandwidth for coming new applications within the fields of connectivity, infotainment and safety," said Hans Alminger, senior manager for Diagnostics & ECU Platform at Volvo, in a statement.
Ethernet was initially used by automakers only for on-board diagnostics. But as automotive electronics advanced, the technology has found a place in advanced driver assistance systems and infotainment platforms.
Many manufacturers also use Ethernet to connect rear vision cameras to a car's infotainment or safety system, said Patrick Popp General Manager at TE Connectivity, a maker of car antennas and other automobile communications parts.
Currently, however, there are as many as nine proprietary auto networking specifications, including LIN, CAN/CAN-FD and FlexRay. FlexRay, for example, has a 10Mbps transmission rate. Ethernet could increase that 10 times.
The effort to create a single vehicle Ethernet standard is being lead by Open Alliance and the IEEE 802.3 working group. The groups are hoping to establish the Ethernet specification "100Mbps BroadR-Reach" as the de facto standard physical layer.
The first automotive Ethernet standard draft is expected this year.
The Open Alliance claims more than 200 members, including General Motors, Ford, Daimler, Honda, Hyundai, BMW, Toyota, Volkswagen. Jaguar Land Rover, Renault, Volvo, Bosch, Freescale and Harman.
Broadcom, which makes electronic control unit chips for automobiles, is a member of the Open Alliance and is working on the effort to standardize automotive Ethernet.
Currently, the groups are working on interoperability requirements for devices inside of a vehicle.
Once the requirements are established, Ethernet will play a big part in the integration of different data streaming sensors, including two and three dimensional and infrared cameras, and radar sensors for sophisticated driver assistant systems.
Ethernet can also be used to connect a display head unit and telematic transceiver systems for GPS and vehicle-to-vehicle communications.
There are currently reference scenarios with as many as 35 Ethernet nodes per car, according to TE Connectivity.
"By around 2020 or so, we estimate there will be about 100 million Ethernet ports worldwide in automobiles," Popp said. "Ethernet is here to stay."