Application of the hottest can bus in automobile

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Since the 1980s, with the wide application of integrated circuits and single chip computers in automobiles, there have been more and more electronic control units in automobiles, such as electronic fuel injection devices, anti lock braking devices (ABS), airbag devices, electronic door and window devices, active suspension and so on. In this case, if the conventional wiring method is still adopted, that is, one end of the wire is connected with the switch, and the other end is connected with the electrical equipment, the number of wires on the vehicle will increase dramatically. Lambrets will use the porous material polyvinylidene fluoride fluorocarbon polymer and carbon fiber polymer Proplast as artificial cornea. A high-end car with traditional wiring method has a wire length of 2000 meters, 1500 electrical nodes, and the weight of wires can reach 40 ~ 60 kg. In addition, although the increase of electronic control system improves the safety, economy and comfort of cars, the accompanying increase in complex circuits also reduces the reliability of vehicles and increases the difficulty of maintenance. For this reason, the voice of reforming automotive electrical technology is growing, so the controller area network (can) on the vehicle came into being

can total oil viscosity drop line is a serial data communication protocol launched by German Bosch Company to solve the data exchange between many control and test instruments in modern vehicles. It is a multi master bus. The communication medium can be twisted pair, coaxial cable or optical fiber. The communication rate can reach 1Mbps and the distance can reach 10km. One of the biggest characteristics of CAN protocol is to abolish the traditional station address coding, and instead encode the communication data block, so that the number of nodes in the network is not limited in theory

because can bus has strong error correction ability and supports differential transceiver, it is suitable for high interference environment and has a long transmission distance. Therefore, can protocol is very attractive for distributed measurement and control in many fields. At present, can bus has become one of the most promising bus standards

at present, the network connection mode on the car mainly adopts two can, one is used for the high-speed can of the power system, and the speed reaches 500kb/S; Another low-speed Can1 for the body

system is north 1 South, with a speed of 100kb/s

the main connection objects of powertrain can are engine controller (ECU), gearbox, ABS controller, airbag controller, etc. their basic characteristics are the same, and they are all systems directly related to vehicle driving

the body system can mainly connects and controls the internal and external lighting, light signals, air conditioning, combination instruments and other auxiliary appliances of the vehicle

at present, there is a "

off" between the two independent buses of powertrain can and body system can to realize the resource sharing between each can, and feed back the information of each data bus to the instrument panel to maintain stability in 400 ° air or nitrogen. As long as the driver looks at the dashboard, he can know whether all the electronic control devices are working normally

since 1989, more and more companies have supported the CAN bus standard, including Mercedes Benz, Volkswagen, BMW, Porsche, Rolls Royce, Jaguar, etc. The electronic companies that support the CAN bus standard include Intel, motorcycle

Lola, Philips, microchip, Siemens, etc. Standardization organizations SAE and JSAE also support can bus standard, and SAE J1939 is the new standard of can

in short, in foreign countries, automobile bus technology will soon be popularized, which is an inevitable trend of automobile development

however, the development of automobile bus in China is not optimistic. Although the number of domestic parts production is considerable, the overall scale is not large and lacks development capacity. Some people even think that the products that Chinese component manufacturers can really develop independently are only audio and speakers. In order to avoid the further widening of the gap between domestic and foreign automotive electronic technology, domestic manufacturers must unite and take the road of joint development

after more than two years of development, Shanghai Tongji TONGJIE Technology Co., Ltd. has completed a highly competitive phased product, and is conducting product inspection and small batch trial loading. It is believed that Chinese people can create newer and better automobile bus products

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