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Application of CAN bus in medium and large passenger cars

With the improvement of people's living standards in cities, the requirements of “humanization” in urban bus design are getting higher and higher. In order to meet the increasing demands of customers, bus manufacturers constantly improve the riding environment and improve the comfort of driving.The continuous installation of electronic devices makes the electric system of the city bus more complicated: the control switch of the whole car is too much, which makes it impossible to arrange on the instrument panel; the total length of the cable is continuously extended and the weight is increasing.As a result, the safety performance of the passenger car's electrical system has shown a downward trend, the frequency of faults has become increasingly rampant, and accidents that endanger safety (self-ignition and open circuit, he has broken the road) have occurred from time to time and have received high attention from the industry.

The application features of CAN bus for large and medium-sized bus mainly include the following:
1) In power transmission system, an CANS,line technology in engine ECU.The gearbox TCU.The ABS/ESP has all the key parts such as application,instead through key word dream parts suppliers before factory CAN open the related CAN BUS protocol,and integrate it into their own standings in the network,and part of the factory is not using CAN bus interface ,or coordinate the parts supply,and do not participate.
2) In terms of customer application,it has become a trend to relize the flexible and intelligent configuration of the system by modularization and generalization of functions according to the intelligent configuration function of CAN bus. The research and development of CAN bus system based on J1939,an internationally common protocol,has lower barriers to entry  and  is easier to achieve breakthroughs. Therefore, domestic enterprises that mainly develop CAN bus to produce are concentrated in the market of large and medium-sized customers.
3) At the same time as the development of the bus communication protocol, the OEM has paid more and more attention to the development of network diagnostic functions. Intelligent diagnosis based on bus has become the mainstream of electrification development.At present, the technical level of domestic enterprises in this area has been quite strong. The most important competition point is the price and user experience of domestic products and foreign products: domestic enterprises have an advantage in price, while foreign companies are better at user experience.
  Due to the most complex body, the body control generally requires an independent solution.Domestic enterprises have launched a complete body CAN bus control system for this demand, which not only solves the problems of communication between electrical appliances and ECUs, but also saves wiring harnesses. It also builds a full-vehicle network platform through input/output modules (ie BCM modules),Optimize control logic, diagnose, etc. to form its own control.In this market, the time gap between foreign auto electronics companies and domestic auto electronics companies is not large, and the technical indicators of some domestic products have reached the international advanced level.