An overload on the CAN communication bus can cause a variety of problems. Here are some of the issues you may encounter:
1) Communication stability decreases: When the load is too large, the communication on the bus may become unstable, and there will be data loss, delay, or duplicate transmission. This can lead to degraded system performance, affecting the reliability of overall operation.
2) Network congestion: Excessive load will increase the data traffic on the bus, resulting in network congestion. This may result in slower data transfer speeds or even data inability to be transferred.
3) Hardware Damage: Excessive load may exceed the processing capacity of the CAN controller, causing the controller to overheat or be damaged. This can cause permanent damage to the hardware of the bus system.
4) Reduced communication efficiency: When the load is too large, the communication on the bus may become inefficient. This may affect applications where real-time performance is required, such as autonomous driving systems for vehicles.
5) Priority Conflict: In CAN communication, the priority of a message is determined by an identifier. When the load is too high, multiple messages with the same priority may occur, resulting in priority conflicts. This can make communication on the bus more complex and inaccessible.
Therefore, when designing the CAN communication system, the load capacity of the bus should be fully considered, and appropriate measures should be taken to avoid excessive loads. This may include limiting the number of nodes on the bus, distributing data traffic wisely, using CAN controllers with more processing power, etc. At the same time, the load on the bus needs to be monitored regularly to ensure that it remains within acceptable limits.