Real-time analysis and optimization of vehicle CAN-CAN gateway

WANG Yu-hui1，2， HAO Kuang-rong1， DING Yong-sheng1， CHEN Sheng-yu2
（1. College of Information Sciences and Technology， Donghua University， Shanghai 201620， China；
2. Shanghai CETC-Motor Co.， Ltd.， Shanghai 200001， China）

Abstract： In order to solve the problem of improving real-time characteristics of CAN-CAN gateway，the causes of transmission delay were investigated. After analyzing the influence of gateway routing time，frame transmission time and CAN network bus-load，an optimization design of improved master-slave node scheduling algorithm based on update bit of signal was introduced. The optimization design was evaluated on a simulation platform given by CAN-CAN gateway hardware and TELLUS? tool of CETC-motor company. The experiment results show that the CAN-CAN gateway with improved master-slave node scheduling algorithm can decrease the transmission delay by about 4.6 percent and well meet the real-time characteristic of CAN gateway.
Key words： vehicle CAN-CAN gateway；transmission delay；signal update-bit；improved master-slave node scheduling algorithm