Automotive electronic control unit CAN communication data reading and writing vehicle network system interaction interface

The data exchange of Arrizo 5's gateway interface usually involves information transmission between electronic devices inside the vehicle, including body systems, entertainment systems, remote control, vehicle status monitoring, CAN data collection and analysis, vehicle DBC control strategies and other information.

As a car using CAN protocol, the development of CAN communication of Arrizo 5 can improve the safety, reliability and real-time performance of the vehicle. CAN protocol is a network protocol used for internal communication in the car, which allows data exchange between different devices in the vehicle, thus providing a better driving experience for the driver.

Suruide has summarized some key points in the development of Arrizo 5 CAN communication: as a driving school, official car management, and data collection project, both customers and technicians must understand the CAN protocol: developers need to have a deep understanding of the CAN protocol, including its working principle, message frame structure, error detection and processing mechanism, etc. The data physical hardware interface of Arrizo is not on the OBD interface. The car has a gateway as data isolation. To collect data, you need to disassemble the instrument panel, find the socket behind the instrument, separate the twisted pair, and then use a multimeter to test the voltage of the twisted pair, identify one as CANH and one as CANL, and connect the CAN analyzer or interface card in parallel to facilitate reading and sending CAN messages.

We use SPY3 or Zhou Ligong CANopen software tools to monitor and debug the data flow on the CAN bus. These tools can help developers analyze CAN messages and optimize communication protocols. In general projects, there will not be much ECU programming involved unless specific functions need to be implemented, which may involve reading and writing data in the ECU. For general projects, just reading data is enough.

The development of CAN communication for Arrizo 5 is a complex process that requires interdisciplinary knowledge and skills. Developers should have comprehensive capabilities in automotive electronics, network communications, and software development to ensure that the developed system is both efficient and reliable.

If you want to add a CAN interface or perform other electronic-related modifications, here are some factors that may need to be considered: First, we need to understand the vehicle circuit: Before we collect CAN data, it is very important to understand the vehicle's circuit layout and electrical system matrix scheme through Speed ​​​​Real. This helps to ensure the safety and functionality of the modification, obtain the interface definition, pin definition, CAN definition and its corresponding connection location, voltage, data transmission method, such as LIN protocol, CAN protocol, which specific control unit is entered, and what information is included.

Due to the complexity of the vehicle's electronic system, if possible, it is recommended that professional technicians perform the modification. Laptops, multimeters, oscilloscopes, diagnostic instruments and other related tools need to be prepared on site. In the process of collecting data, we must ensure the safety of the car. When modifying the car, we should ensure that all wires are connected correctly to avoid short circuits, loops, CAN communication failures or other risks.

Thirdly, when an external device is plugged in, to measure voltage, power consumption, sleep status, etc., it is necessary to ensure that the newly connected host device is compatible with the vehicle's existing system to avoid problems with data exchange, such as interrupt-type diagnostic requests, which are absolutely not allowed while driving. In this case, CAN monitoring must be used, which is also a key element of the technical route.

Considering that the upper computer device interface may need power supply, we must ensure that the vehicle's power system can support additional loads and never use devices with too high power. For example, cars generally have an output of 12V3A. If a high-power upper computer is used, the OBD interface will not be powered enough. You may need to add an inverter, upgrade the power system, or use a dedicated charger.

Finally, after the modification of the newly added host computer and wireless gateway equipment is completed, a comprehensive functional test must be carried out to ensure that all equipment can work properly and all communications are normal. Do not force the reverse to cause a fault code to be reported, do not adjust the CAN communication rate too fast, and do not request ECU data feedback too quickly through diagnosis. During installation, keep the lines clean and orderly, avoid pulling wires randomly, and resolutely prevent CANH and CANL from connecting together.

Data exchange through the gateway interface of Arrizo 5 is a complex process involving multiple factors, including information transmission between electronic devices inside the vehicle, adding a CAN interface or performing other communication gateway electronic-related modifications.