Online Fault Diagnosis for Controller Area Networks

Abstract

The controller area network (CAN) is a field bus that has been widely used in distributed embedded systems due to its inexpensiveness, robustness, guarantee of latency times as well as error detection. However, electromagnetic interference from the operational environment and hardware malfunction may cause short disturbances and permanent failures respectively, inevitably bring on communication errors or even break off the communication. To enhance the dependability of CAN communication, research on the on-line fault diagnosis is carried out in this paper, a Monitor is designed to diagnose faults in CAN nodes and a hybrid method with active and passive mode is presented to diagnose faults among communication links. We analyze the relative works, describe the CAN fault model, and focus on the fault diagnosis mechanisms.

Data and Bandwidth Analysis of CAN Bus in a System Using MATLAB

“…A CAN flexible data rate is discussed in [5] where the author presents the CAN format that improves the data rate of CAN from 1 Mbps to 2.5 Mbps by adding extra bits in the control field to enable the CRC sequence to secure longer frames. To improve the CAN communication dependability, a research on online fault diagnosis is performed in [6]. One of the bandwidth allocation schemes is proposed in [7] where the algorithm not only satisfies the requirement in performances of real-time system but also utilizes the bandwidth fully.…”