Reliability Research for Steer-by-Wire System of Electric Vehicle

Abstract

Steer-by-wire System of Electric Vehicle must meet the advantages of both protocols. It is reported that the FlexRay real-time and reliability requirements. An approach in how to will very likely become the de-facto standard for in-vehicle estimate the reliability of Steer-by-wire system considering the communications. The fault-tolerant design of the channels and delay caused by network transmission errors is proposed. In the the protocol make FlexRay Bus having a great advantage paper, a distributed architecture of Steer-by-wire system is applied in the steer-by-wire system. researched to analyze the delay time of the system, and design the TDMA slots of FlexRay Bus. In addition, the reliability of the In the paper a distributed architecture of steer-by-wire system is calculated. The maximum tolerable response time of the system is firstly described, in which simplified control method system is performed by using Matlab/Simulink and other is shown. Then, based on the analyzing of the delay time of parameters of the system based on our experiment platform. The the system, the time division multiple access (TDMA) slots of results show that when the probability of losing one cycle is less the FlexRay Bus is designed, in which deferent sequences of than 0.1, the reliability of the system achieves the design goal. the slots will cause deferent transmission delays. Finally, The approach in this work can be taken as a reference for quantification of the reliability is done to obtain the system designing Steer-by-wire system of electric vehicle. tolerance for the rate of FlexRay error frame under the design requirement of reliability. SYSTEM NTRODUCTION With the world's energy crisis and the worsening A. The Architecture of Steer-by-wire System environment, research of electric vehicle is emphasized more and more, and steer-by-wire system of electric vehicle has been put on the agenda. Steer-by-wire system is one in which conventional mechanical links between the steering wheel and the front wheels are removed, and is operated by electrical actors. Due to the importance of vehicle safety, such electrical systems must satisfy both stringent real-time performance and reliability requirements. However, so far, quantitative standards for automotive steer-by-wire reliability do not exist. As the references show, standards developed for aircraft can be applied, which quantify a rate of one failure occurring in one billion operating hours, or 10 −9