Research on CAN Bus Break Fault Detection Method Based on Loading Frequency Modulated Signal

Abstract

In allusion to the problem that bus break fault can’t be detected when CAN bus is not in the process of data changing, a new method that through adding high frequency signal generator and corresponding detection unit on the bus network has been brought forward, and the CAN bus break fault detection method has been realized. In this paper, detection model of CAN bus break fault is constructed, the 5 MHz sinusoidal signal generator and circuit design of detection unit are also provided. Finally, the rationality of the new method is verified by a 4 nodes network. The research conclusions indicate that bus break fault detection can be detected in real-time and completely by this way. Besides, the provided method is not occupy the network band width and can solve the existing detection institution problem effectively, the apply prospect is very fine in the occasion whose reliability requirement is relatively high.

Keywords

• CAN bus
• Fault detection
• FM signals
• Frequency detection method.