With the rapid development of electric vehicles, driverless car technology, and the increase of advanced driver assistance systems and human-computer interaction, the traditional CAN bus is becoming more and more powerless in terms of transmission rate and bandwidth, so the improved version of CAN The bus came into being. From the 13th ICC Conference in 2012, to the international standardization ISO 11898 series in 2015, CAN FD (CAN with Flexible Data rate) is entering a period of rapid development.
Both speed and stability
Compared to the "traditional" CAN protocol, CAN FD has two major advantages:
1, CAN FD uses variable rate, the maximum rate can reach 10Mb / s, while the traditional CAN protocol is only 1Mb / s;
2, able to support higher load, transfer rate of up to 64 bytes in a single data frame, avoiding the frequent data splitting situation.
The CAN-FD standard can raise the data segment of the CAN message to a higher bit rate, wherein the data segment that can increase the communication rate includes two control bits, a data length bit, a data bit, and a CRC check bit. In CAN-FD message communication, the standard communication baud rate is used in the arbitration segment and the following data control segment. When the data segment is reached, the communication baud rate of the CAN-FD bus will switch to higher. Communication baud rate. At this time, only one CAN node is transmitted on the CAN bus, and other nodes enter the listening mode. When the data segment is transmitted, the communication baud rate is switched back to the standard mode.
Two communication baud rates are often used for CAN-FD communication, so the "FD" is interpreted as (flexible data rate) "Flexible Data rate"
Another new feature of CAN-FD is the reduction of control bit overhead. At present, the CAN2.0 standard has a maximum of 8 bytes of data, and the maximum number of bytes of the CAN-FD data bit is increased to 64 bits, and the CAN-FD has a higher effective transmission load. For example, the CAN-FD bus compares with CAN 250Kbit/s and 8-bit data transmission at a rate of 2 Mbit/s and 64-bit data. It is obvious that the effective transmission load of CAN-FD is 8 times that of the CAN transmission load at the same time. The CAN-FD standard is backward compatible with the CAN2.0A/B standard. CAN-FD nodes can communicate with existing CAN2.0 protocol nodes. Of course, CAN-FD frames cannot be used in this case. This compatibility allows CAN 2.0 devices to smoothly transition to CAN-FD-enabled hardware. Therefore, we have another saying about CAN-FD, which is "CAN3.0".
Next "wind vent"
Auto-driving vehicles are undoubtedly the future development trend of cars. 65% of people believe that self-driving vehicles will appear in 10-15 years. In addition, Chinese drivers are accustomed to using advanced brake assist systems, blind spot detection and automatic parking systems. auxiliary system. According to HIS, by 2020, 8% of new cars will be equipped with such systems in China, and radar, ultrasonic and other inductive components used in these systems require high-speed, reliable and stable in-vehicle networks to be connected to the system. This is the advantage of CAN FD.
China's economy has entered the development stage of “new normalâ€. Experts expect that China's auto market will continue to rank the world's number one in terms of global automobile production and sales with a growth rate of 7%. As the bus with the highest market share in the automotive network market, the Chinese market is successful for CAN FD. The importance of promotion is self-evident.
In addition to the traditional automotive field, CAN series bus systems are also very successful in non-automotive applications, such as CNC machine tools, robots, servo clicks and other industrial automation fields, with more than 800 million CAN nodes installed worldwide each year. The introduction of CAN FD will bring faster and better application experience to users based on the advantages of CAN bus.
If you want to do something good, you must first sharpen it.
CAN FD is undoubtedly the next vent, as a manufacturer with a high profile, it will certainly be ready to ride the wind and waves.
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