CANBUS introduction lecture for automotive

canbus lecture

1. CANBUS E.Naranbaatar 2024

2. CAN Bus Technology Definition: Controller Area Network (CAN) is a robust vehicle bus standard designed to allow microcontrollers and devices to communicate with each other without a host computer. Invented by Bosch in 1986. Commonly used in automotive applications and other embedded systems.

3. History and Evolution of CAN Bus 1983: Development began by Bosch. 1986: First CAN controller chip introduced by Intel. 1991: First car with CAN bus (Mercedes-Benz). Evolution into CAN FD (Flexible Data-rate) for higher performance.

4. Basics of CAN Bus Physical Layer: Defines the electrical signals on the bus. Data Link Layer: Manages message framing, arbitration, acknowledgment, error detection, and fault confinement. Two-wire twisted pair for differential signaling.

5. CAN Bus Architecture Nodes: Each node contains a CAN controller and a CAN transceiver. Bus Topology: Linear bus with nodes connected to the mainline. Bit Timing: Synchronization is key for communication.

6. CAN Bus Message Structure Frame Types: Data Frame, Remote Frame, Error Frame, Overload Frame. Data Frame Components: Identifier, Control Field, Data Field, CRC Field, Acknowledgment Field, End of Frame. Standard (11-bit) and Extended (29-bit) identifiers.

7. CAN Bus Protocol Non-destructive bitwise arbitration. Priority given to lower identifier values. Error Handling: Automatic retransmission in case of errors.

8. Advantages of CAN Bus High reliability and robustness. Real-time communication. Reduced wiring compared to point-to-point wiring. Error detection and fault confinement.

9. Applications of CAN Bus Automotive: Engine control units, airbags, antilock braking systems, etc. Industrial Automation: Machinery and equipment. Medical Equipment: Patient monitoring systems.

10. Variants of CAN Bus CAN FD (Flexible Data-rate): Enhanced version with higher data rates. CANopen: Higher-layer protocol based on CAN. DeviceNet: Another higher-layer protocol used in industrial automation.

11. Future of CAN Bus Technology Ongoing development of higher speed and more secure CAN protocols. Integration with Ethernet-based networks. Expansion in autonomous driving and IoT applications