What is the function of a CAN controller?
2 Answers
CAN controller mainly has the following two functions: 1. Receive the data sent by the microprocessor in the control unit, process the data and transmit it to the CAN transceiver. 2. The CAN controller receives the data from the CAN transceiver, processes the data and transmits it to the microprocessor. There are usually two types of CAN controllers for automotive onboard networks, which are specifically introduced as follows: (1) Independent onboard network CAN controller: It has relative independence and is very flexible to use, generally appearing in the form of a single-chip integrated circuit. (2) Combined onboard network CAN controller: It is combined with the microprocessor to form a microprocessor control component with a CAN control function interface. Using a combined CAN controller can simplify and compact the circuit, and the efficiency can also be improved accordingly.
After driving for so many years, I've realized that the CAN controller is like the 'communication hub' in a car. It connects various electronic modules such as the engine, braking system, and dashboard, enabling them to exchange information. The benefit is improved efficiency—for example, RPM data is directly transmitted to the computer to adjust fuel injection, making the car more fuel-efficient. At the same time, it detects errors and conflicts, preventing data loss or miscommunication. If issues arise, common symptoms include warning lights or false fault alerts, which can affect driving safety. Therefore, regular electrical system checks are crucial to avoid risks like sudden fuel consumption spikes or ABS failure. As car owners, we should remind mechanics during maintenance to inspect the CAN bus connections and prevent wire aging, reducing such troubles.
