As cars develop intelligently, cars are converted from mechanical systems to electronic systems. At present, the proportion of original electrical and electronic products used in automobiles has increased from 25% to 40%, while ADAS, autonomous driving, and vehicle information. The system and the Internet of Vehicles all require hardware tickets. How to find a breakthrough point becomes especially critical.
Wireless BMS concept carThe first wireless car battery management system (BMS) concept car was developed by Linear Technology's design partner LION Smart, which uses Linear Technology's highly accurate battery pack monitor and its SmartMesh wireless mesh network on the BMW i3. Integration has been implemented to replace the traditional wired connection between the battery pack and the battery management system.
This major breakthrough solves the long-standing reliability problems caused by automotive wiring harnesses and connecting lines in electric vehicles and hybrid/electric vehicles, and simplifies BMS design and manufacturing.
According to a linear engineer, automakers face the challenge of ensuring the safety and reliability of both electric and hybrid vehicles. The LTC6811 battery pack monitor measures voltages of up to 12 series-connected batteries with an accuracy of better than 0.04%, combined with the SmartMesh wireless mesh network system to solve the problems caused by automotive wiring harnesses and connectors. Long-standing reliability issues.
Wireless BMS System OpportunityThe basis of BMS is to understand the state of the car battery by measuring the voltage, current and temperature. The prominent way of the cable is safe, intelligent, environmentally friendly and cheap. It has been used ever since. SmartMesh's wireless BMS is smarter, smarter, more environmentally friendly, and cheaper than traditional wired BMS systems. In addition to the industry's development and advancement, its market prospects should not be underestimated.
More secure: Whether it is CAN bus or isoSPI bus, the battery monitoring chip is connected in series by daisy chain. Once there is a problem in some connection, the whole system will be paralyzed. Linear's wireless BMS solution does not have this problem, path grading and frequency hopping, achieving more than 99.999% reliability; SmartMesh is a dedicated network with 128-bit encryption, which is more secure;
Smarter: The wireless connection solution makes the battery pack position more flexible, and has better scalability. It can easily increase the temperature, current and other sensors according to the application requirements. In the harsh environment, it has time synchronization. The advantages''
More environmentally friendly: The wireless solution saves 10m wire and 0.5kg connector and phase changer per car. Therefore, for every 50,000 vehicles produced, 500km of wire and 25,000kg of connectors and phase changers will be saved. While saving costs, it also meets the trend of lightweight vehicles;
Cheaper: Wireless reduces assembly costs, future silicon is cheaper than wires and connectors, and total BMS costs will be lower.
In addition, with the network composed of SmartMesh IP, there are currently 60,000 networks adopting this technology in the world, and the maximum number of nodes supported is several thousand. Using time synchronization and frequency modulation technology, data congestion such as network bursts can be effectively avoided. In addition, many of the features are similar to the SmartMesh technology previously applied to BMS.
First, Wireless Router
So what is a wireless router?
Wireless router, according to the definition of Baidu Encyclopedia: Wireless router is used for users to access the Internet, with wireless coverage of the router.
A wireless router can be thought of as a repeater that forwards the broadband network signal from the wall of your home through an antenna to nearby wireless network devices (laptops, Wifi-enabled phones, tablets, and all Wifi-enabled devices).
The popular wireless routers in the market generally support four access methods: dedicated xdsl/cable, dynamic xdsl, pptp, and generally can only support 15 to 20 devices online at the same time. It also has some other network management functions, such as dhcp service, nat firewall, mac address filtering, dynamic domain name and so on. The signal range of the general wireless router is 50 meters radius, and the signal range of some wireless routers has reached 300 meters radius.
The name of wireless router can be separated out of two keywords: wireless and routing.
Understand the technical principle behind these two words, you understand the wireless router.
Wireless is also what we often call Wi-Fi. Wireless routers can convert home broadband from wired to wireless signals, and all devices can happily surf the Internet as long as they connect to their own Wi-Fi. In addition, these devices also form a wireless local area network, where local data is exchanged at high speed and is not limited by the bandwidth of home broadband.
For example, many people have smart speakers in their homes that can be used to control various smart appliances. When you say small X small X, turn on the TV, the speaker actually finds the TV through the LAN and sends instructions, and does not need to connect to the Internet; And if you let it broadcast news, you have to get data through the Internet.
The Local Area Network we talked about earlier, also known as the Intranet, is represented by the Local Area Network (LAN) on the router, so the Wi-Fi signal is also called WLAN(Wireless LAN); The Internet we want to access, also known as the extranet, is represented on the router by the WAN(Wide Area Network).
On the Intranet, the IP address of each device is different, which is called a private address. All devices on the Internet share the same public address, which is assigned by broadband operators such as China Telecom Unicom.
The router is the bridge between the Intranet and the external network. The above mentioned IP address translation, packet forwarding, is the router routing function. In other words, the router is the hub of the home network, and the data of all the devices must be forwarded through it to access each other or reach the external network, which means that one husband is the key and ten thousand men are not open, so the comprehensive router is also called "home gateway".
Second, the demand for wireless routers
I do not know if there is a sudden WIFI break when you play games at home, and a stable router is crucial at this time. However, it is important to note that your WIFI frequently dropped may not be a problem with the router, it may also be a problem with the carrier network. (Router means I don't back this pot)
In fact, for most people, there are two basic requirements for wireless routers
Stable and do not drop
Fast Internet and easy setup
Some people will have some advanced needs:
There are some features, USB interface, can be external U disk or hard disk, can achieve simple nas functions, QOS, etc., to advertising and so on
Mesh networking, when the house area is large, multiple routers can be used for Mesh networking
How to choose a wireless router
The wireless router market is in the transition stage from WiFi 5 to WiFi 6, if you want to buy the first choice is definitely WiFi 6 wireless router, which is the future trend.
The speed of WiFi 6 is nearly 40% higher than the previous generation 802.11ac, and the highest connection speed can even reach 9.6Gbps, while the highest speed of 802.11ac is only 6.93Gbp. More importantly, unlike 802.11ac, which only covers the 5GHz band, WiFi 6 covers 2.4GHz and 5GHz. Although the 5GHz band has less interference, it has weak wall penetration ability, and the 2.4GHz band has strong wall penetration ability, which takes into account each other.
So why choose a WIFI6 router?
Compared with the previous generation of 802.11ac WiFi 5, the maximum transmission rate of WiFi 6 in the 5Ghz band has been increased from 3.5Gbps to 9.6Gbps, and the theoretical speed has been increased by nearly 3 times. WiFi 6's 5Ghz single-stream 80Mhz bandwidth can reach theoretical speeds of up to 1201Mbps and 160Mhz bandwidth of up to 2402Mbps.
The band supports 2.4Ghz and 5Ghz.
In terms of modulation mode, WiFi6 supports 1024-QAM, which is higher than the 256-QAM of WiFi 5, and the data capacity is higher. Some high-end WiFi 6 routers support 4096-QAM.
WiFi6 supports MU-MIMO (multi-user multiple-input multiple-output) technology, and supports both upstream and downstream MU-MIMO, with a maximum support of 8T×8R MU-MIMO. The speed is greatly improved. High concurrency, WiFi6 5GHz band, terminal connections up to 128! 5 times that of WiFi5. Effectively solve the Internet needs of multi-person networking and smart home;
WiFi6 adopts OFDMA (orthogonal frequency division multiple access) technology. After using OFDM to parent the channel, the transmission technology of transmitting data is loaded on the subcarrier, allowing different users to share the same channel, allowing more devices to access, with shorter response time and lower delay.
Low latency, WiFi6 time delay can be as low as 10ms, compared to WiFi5 30ms delay, only 1/3. This performance refresh is extremely friendly to game lovers;
If WiFi6 (wireless router) devices need to be certified by the WiFi Alliance, they must use the WPA 3 security protocol, which is more secure.
The WiFi6 wireless router is backward compatible with WiFi5 and WiFi4 terminals.
Fourth, the misunderstanding of purchasing routers
Is the through-wall router really through-wall?
Mistake; The country has strict limits on the transmission power of the wireless router antenna, if you have a lot of rooms in your home, and there are many walls between them, even if you buy an expensive wireless router, you can not do one to cover all the room signals. If the signal is not good, you can consider multiple wireless router Mesh networking.
Does a wireless router have a stronger signal with more antennas?
More antennas just to match the X*X MIMO mode, the more antennas, the more channels, can only ensure that the network is more stable, the impact on the signal is little, the strength of the signal is only related to the wireless transmission power. The wireless transmission power of the country has a standard.
Wifi 5 Wireless Router,5Gz Wifi Router,Wi-Fi Routers For The Home,Lte Modem Router
Shenzhen MovingComm Technology Co., Ltd. , https://www.szmovingcomm.com