Gateway Modeling and Response Time Analysis on CAN Clusters of Automobiles

A central gateway is a very important node for connecting the buses to pass messages from one bus to the other bus(es) in current in-vehicle networks. However, transmitting message through gateway causes additional delay to the end-toend delay of messages. Existing methods for analysis of gateway processing delay usually employed experimental measurements which are inefficient and cannot obtain a safe delay bound.Meanwhile, the increased complexity of in-vehicle networks require theoretical analysis of gateway processing delay to obtain a safe upper bound delay. In this paper, we first construct a central gateway model with CAN clusters, then we propose a novel response time analysis method with rigorous proof to compute the upper bound delay of gateway tasks. Experimental results demonstrated that the proposed approach can obtain the upper bound delay in reasonable time even for a large-scale network workload, and the calculated upper bound is close to the exact worst case delay.