The 2009 Golden Year of the LED was also reflected in the current Expo. The author sees that the technological innovation of LED light source not only makes the high-power LED street lighting products strong into the market, but also, in terms of product technology and market development, enterprises have begun to go out of their own branding road.
Advertising slogan. LED manufacturers, which mainly used decorative quantitative products, have launched functional LED lighting products at this year's Light Expo, including lawn lights, street lights, landscape lights, square lights, tunnel lights, and so-called "spotlights." "A kind of lighting products, all with "high power" as the signboard, unveiled at the market
The person in charge of the exhibition area of ​​many exhibitors told the author that two years ago, due to the technical problem that the brightness of LED light has not been solved, many experts can only make foreground predictions for LED technology applications for general lighting. Nowadays, the technical replacement of ordinary lighting has achieved a complete breakthrough. As the price of key components declines, if current forecasts are to be made, then LED products will occupy the mainstream application field.
Brand management awareness
The development of the LED product market has clearly absorbed the experience of ordinary lighting products. At this year's light fair, the LED company represented by Auman has already paved the way for the future "brand road".
The author saw that many exhibitors abandoned the previous two fancy practices in the booth promotion, using LED landscape lighting to attract attention, and vice versa, using various means to deepen the buyer's understanding of the superiority of LED relative to traditional light source. And, even more gratifying, many exhibitors' exhibition areas have their own main products and show their core competitiveness.
Auman Technology Lighting, as one of the drafting units of the national standard for LEDs, is particularly eye-catching in the LED exhibition area of ​​this year's Expo. A person in charge of the exhibition area said that since 2007, the company has carried out a large-scale expansion, and the company has also carried out a strategic brand upgrade, which will build Auman into a LED brand with considerable influence and well-known in the market. The goal.
However, a general manager of LED companies, who did not want to be named, said that the current status of the domestic LED industry is still "low threshold, mixed industry", especially the market share of independent research and development products is low, in the market growth rate, 80% is an OEM (OEM) product that is packaged abroad. Therefore, the market expects leading companies with competitive advantages to emerge and lead industry standards to promote the formation of a regulated and orderly LED market.
What is Car Ethernet
Car Ethernet is a new local area network technology that uses Ethernet to connect the electronic unit in the car. Unlike traditional Ethernet, which uses 4 unshielded twisted pair cables, car Ethernet can achieve a transmission rate of 100Mbit/s or even 1Gbit/s on a single pair of unshielded twisted pair cables. At the same time, it also meets the requirements of the automotive industry for high reliability, low electromagnetic radiation, low power consumption, bandwidth allocation, low latency and synchronous real-time. The physical layer of on-board Ethernet uses BroadRReach technology, and BroadR-Reach's physical layer (PHY) technology has been standardized by the One-pair Ethernet Alliance (OPEN). Therefore, it is sometimes called Broad RReach (BRR) or OABR (Open Alliance BroadR-Reach). The MAC layer of vehicle Ethernet adopts the IEEE 802.3 interface standard and seamlessly supports widely used high-level network protocols (such as TCP/IP) without any adaptation.
On-board Ethernet protocol architecture
Vehicle-borne Ethernet and its supported upper-layer protocol architecture are shown in Figure 1. Vehicle-borne Ethernet mainly involves OSI layer 1 and Layer 2 technologies, while vehicle-borne Ethernet also supports AVB, TCP/IP, DOIP, SOME/IP and other protocols or application forms.
On-board Ethernet framework
Among them, AVB is an extension of traditional Ethernet functions, which enhances the real-time performance of traditional Ethernet audio and video transmission by adding precise clock synchronization, bandwidth reservation and other protocols, and is a network audio and video real-time transmission technology with great development potential. SOME/IP (Scalable Service-Oriented MiddlewarE on IP) specifies the video communication interface requirements for vehicle camera applications, which can be applied to the field of vehicle cameras, and realizes the mode control of driver assistance cameras through apis.
As an extension of AVB protocol, Time-Sensitive Networking (TSN) introduces related technologies of time-triggered Ethernet, which can efficiently realize the transmission of automotive control information. In addition, the on-board Ethernet of the 1Gbit communication standard also supports Power Over Ethernet (POE) function and Energy-Efficient Ethernet (EEE) function. The POE function provides power for connected terminal devices while transmitting data through twisted pair cables, eliminating the need to connect external power cables to terminals and reducing the complexity of power supply.
On-board Ethernet standardization
In terms of in-vehicle Ethernet standardization, the IEEE802.3 and IEEE802.1 working groups, AUTOSAR, the OPEN Alliance and the AVnu Alliance have played a major role in promoting it.
The IEEE802.3 local area network standard represents the mainstream Ethernet standard in the industry, and the on-board Ethernet technology is developed on the basis of IEEE802.3, so the IEEE is currently the most important international standardization body for on-board Ethernet. In order to meet the requirements of the car, it involves the development of a number of new specifications and the revision of the original specifications within the two working groups of IEEE802 and 802.1, including PHY specifications, AVB specifications, and single-wire to data line power supply. In addition, AVB related to AV transmission, timing synchronization and other specifications also need to be standardized by other technical committees of IEEE, such as IEEE1722 and IEEE1588.
OPEN Alliance
The OPEN Industry Alliance was launched in November 2011 by Broadcom, NXP, and BMW to promote the application of Ethernet-based technology standards to in-car connectivity. The main standardization goal is to develop a 100Mbit/s BroadR-R physical layer standard and develop OPEN interoperability requirements.
AUTOSAR
AUTOSAR is a consortium of automotive manufacturers, suppliers, and tool developers that aims to develop an open, standardized automotive software architecture, and the AUTOSAR specification already includes the automotive TCP/UDP/IP protocol stack.
AVnu
The AVnu Alliance was formed by Broadcom in collaboration with Cisco, Harman and Intel to promote the IEEE 802.1 AVB standard and the Time Synchronization Network (TSN) standard, establish a certification system, and address important technical and performance issues such as precise timing, real-time synchronization, bandwidth reservation, and traffic shaping.
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Shenzhen MovingComm Technology Co., Ltd. , https://www.movingcommiot.com