TITLE:
Improved Automotive CAN Protocol Based on Payload Reduction and Selective Bit Stuffing
AUTHORS:
B. Vinodh Kumar, J. Ramesh
KEYWORDS:
CAN, Selective Bit Stuffing, Payload Reduction, Worst Case Response Time
JOURNAL NAME:
Circuits and Systems,
Vol.7 No.10,
August
31,
2016
ABSTRACT: In this research paper,
the implementation strategies of automotive controller area network protocol
are investigated and the short messaging scheme with selective bit stuffing
method to improve the effective utilization of its bandwidth has been proposed.
There would be a sharp decrease in the performance of traditional CAN protocol
because of considerable increase in the number of ECUs (Electronic Control
Units) and infotainment gadgets connected in the vehicle architecture. The
demand for safety, emission, diagnostics and comfort norms has steeply
increased the number of messages in the 250 Kbps CAN network as the
computational power of ECUs has gone up. To overcome this problem, the short
CAN method has been proposed and the work is benchmarked with SAEJ1939 Heavy
commercial vehicle CAN standard. The Matlab Simulink based short CAN has been
modeled and the performance of the proposed system has evaluated using virtual
instrument cluster. Experimental results have shown that compared to the
traditional CAN, the proposed method has reduced the worst case response time
of CAN extended frame from 160 μ sec to 144 μ sec. Selective bit stuffing
technique has reduced the impact of bit stuffing over the payload and improved
the utilization factor for the CAN bus without affecting the CAN message ID
properties. The proposed algorithm has been modeled and simulated using CAN
Matlab model Simulink and it has been verified using virtual CAN tool and real
time CAN bus hardware.