I. Introduction to communications
car charging station manufacturers said：Communication, also used the word communication, some people believe that the letter is biased results, while the news favours the process and the way, but there does not seem to be too much difference in the concept of categorization can not go tangled. Whether it is correspondence or communication, it is the use of various signals, such as electricity, magnetism, light, etc., to transmit the information to be expressed to the destination. As a simple example, if there are two students living in Building 1 and Building 2, they discuss that if they see a white shirt, they will skip class together today. Here can be simplified as, in a particular scenario, white shirt = skip class together, it corresponds to the communication protocol, in addition to several actions involved: 1. hanging white shirt 2. see white shirt 3. day light enough to see the shirt, respectively, corresponding to the communication theory of encoding, decoding, channel. Of course, the actual life of the communication, to be much more complex than the example of the white shirt, the need for reliability, stability, economy and other perspectives to consider the choice of channel, as well as the cost of encoding and decoding equipment and so on, for example, we can choose the 4G of the Internet of Things communication network, but the cost is high, you may give up some of the stability, to choose the GPRS Internet of Things communication network.
car charging station manufacturers said：In addition to the basic actions of protocol, encoding and channel mentioned above, an important issue in IOT communication is to make a number for the origin and destination of any information, that is, to express clearly WHO IS WHO, through the number can identify any device in the world at the origin and destination, and through the relevant mechanism, make the information according to a certain path to be transmitted between the two. This is called "addressing", which starts with how to assign an address, and continues with how to let the signal find the destination address through specific rules.
car charging station manufacturers said：The two most important address concepts in IoT communication are IP address and MAC address. IP address is the address used by the Internet protocol, while MAC address is the address used by the Ethernet protocol. each node of Ethernet has a globally unique 48-bit address, which is managed by the IEEE organisation, and the MAC address is burned into each network card by the card manufacturer. A network card manufacturer burns the MAC address into each card, the MAC address is as unique as the identity card number. the mapping relationship between the MAC address and the IP address is constantly being increased and updated by each host, which becomes the "address mapping table", and the IP address is likened to a door number. So a device with a certain MAC1 ID card, can today in the door number IP1 to stay, can also tomorrow in the door number IP2 to stay, the same MAC2 ID card device can also be in the IP1 to stay.
Comparable to IP addresses are URL (Uniform Resoure Locator) addresses, meaning Uniform Resource Locator, referring to the address of Internet files on the Web, URLs use numbers and letters in a certain order to determine an address, URLs must be converted to door numbers (i.e., IP addresses) by DNS servers to find the where the file is placed on a server on the web.
II. Vehicle Pile Communication
car charging station manufacturers said：1. CAN communication between vehicle and DC pile based on GB/T 27930-2023
car charging station manufacturers said：CAN is the abbreviation of Controller Area Network, which is developed by BOSCH, a German company famous for the development and production of automotive electronic products, and eventually became an international standard (ISO11898), and is one of the most widely used field buses in the world. In North America and Western Europe, CAN bus protocol has become the standard bus for automotive computer control systems and embedded industrial control LANs, and has the J1939 protocol designed for large trucks and heavy machinery vehicles with CAN as the underlying protocol.
car charging station manufacturers said：Currently, China and Japan use CAN bus communication in DC fast charging. In our standard, the general flow of DC charging is described as follows: completion of physical connection - low-voltage auxiliary power-up - charging handshake - parameter configuration - charging - communication before the end - end of charging.
car charging station manufacturers said：After the low-voltage assisted power-up, the vehicle and the pile enter the communication phase until the end. Throughout the communication process, the vehicle and the pile transfer information between each other, we call it "message", the following is based on the national standard message definition summary, which begins with C for the charging pile information, B begins with the vehicle VCU, BMS information, through these definitions, we can know that the charging process, the electric vehicle and charging pile roughly what needs to be exchanged between them.
Sichuan Green Science & Technology Co., Ltd.
0086 19158819831
Post time: Aug-01-2024
