Divisor and QR Parameter Optimization in QRC to Improve the Compression Rate

Controller area network (CAN) bandwidths are currently limited when accommodating increased traffic volume due to the increase in vehicle electronic control units (ECUs). Research is underway to develop a lossless CAN data compression algorithm that uses existing bandwidth networks to reduce the size of transmitted data while minimizing cost and reliability issues without hardware changes. In this study, we propose the optimization of quotient remainder compression (QRC) parameters to improve the compression ratio. The relationships between the divisor, quotient remainder (QR) parameters, and the amount of change in the data were analyzed, and various divisor and QR parameter values were applied to determine the optimal parameter values that provide the best compression results. Experimental results obtained using actual vehicle driving data showed that the compression rate was improved through QRC parameter optimization compared to using the existing QRC system. The proposed approach can be applied to CAN, CAN-FD, FlexRay, and Ethernet systems to reduce the bus load rate and improve the network bandwidth availability.