2 pin 5051510200 Rubber Shell power Connector Single Row Sheath Terminal Harness

1. Development prospects

With the development of ITS in recent years, the emergence of new electronic communications products represented by 3G (GPS, GIS, and GSM) has put forward higher requirements for comprehensive wiring of cars and sharing of information. The CAN bus is designed to meet these requirements.

The function of the electrical control unit calculates, processes, judges the information of the air flow meter and the input of various sensor input according to its memory program and data, and then outputs instructions. At present, on some mid -to -high -end cars, not only the ECU is applied on the engine, but the ECU traces can be found in many other places. For example, the anti -dead braking system, the 4 -wheel drive system, the electronic control automatic transmission, the active suspension system, the airbag system, and the multi -directional power control seat are all equipped with their own ECUs. With the increase of the electronic automation of cars, the ECU will increase increasingly, and the lines will become increasingly complicated. In order to simplify the circuit and reduce the cost, the information transmission between multiple ECUs on the car must adopt a technology called multi -road reuse communication network, and the ECU of the entire vehicle is used to form a network system, which is the aforementioned CAN data bus bus Essence

The CAN bus has the freedom of networking and strong scalability; automatic error definition is simplified to simplify the operation of the electronic control unit on communication; it can determine the priority of the content according to the content, and solve the real -time nature of communication. Adopting, there are also broad application prospects in the field of industrial control.

2. CAN's classification design

In a single network composed of CAN bus, countless nodes can be theoretically hung, but in practical applications, the number of nodes is limited by the electrical characteristics of network hardware. At present, the network connection method on the car mainly adopts two CAN: one is a high -speed CAN used to drive the system with a rate of 500kb/s, that is, the power bus; the other is a low -speed CAN for the body system with a rate of 100kb/s. Called into the entertainment bus. The driver system is mainly connected to the engine controller (ECU), ASR and ABS controller, airbag controller, combined instrument, etc. Their basic characteristics are the same, and they are controlled by direct control with cars. The main connection objects of the body system CAN are the control locks, electric windows, rearview mirrors, and internal lighting lights in the four doors. In addition to the above two bus, some cars also have the third CAN bus, which are mainly responsible for satellite navigation and intelligent communication systems.

The CAN bus is a three -layer network, including the physical layer, data link layer and application layer. The physical layer and data link layer have been implemented by hardware. They are currently standardized. There are ready -made components (CAN controller and transceiver). Therefore, add the CAN controller and transceiver to the single -chip microcomputer to enable the software to implement the corresponding driver to basically implement CAN's communication function. However, this is not enough for the application of automotive electronics, because there are many functions of the data link layer without definition, such as the functional implementation of messages with logical relationships and network management. Therefore, the structure of the communication protocol program code should be the underlying driver+application code (the application code of the communication function).

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