Vehicle steer-by-wire system (SBW) can improve the handling stability, passive safety, active safety and drive comfort significantly, which becomes a hot topic in research. However, the safety problem of SBW is one of the most critical problem in its practical application. In order to solve the safety reliability problem of SBW, a dual-redundancy steer-by-wire system (DSBW) is proposed in this paper by applying the redundancy theory, in which no system failure is achieved when any single random electrical fault occurs, showing that DSBW is a system-level dual-redundancy system rather than a system with local redundancy. Finally, a DSBW prototype is manufactured to prove its high safety reliability. Fault injection experiments of the system are performed, in which DSBW works normally when any single electrical fault occurs.

线控车辆转向系统（SBW）可以显着提高操纵稳定性，被动安全性，主动安全性和驾驶舒适性，这已成为研究的热点。但是，SBW的安全问题是其实际应用中最关键的问题之一。为了解决SBW的安全可靠性问题，本文应用冗余理论提出了一种双冗余线控转向系统（DSBW），该系统在发生任何单个随机电气故障时都不会导致系统故障，表明DSBW是系统级双冗余系统，而不是具有本地冗余的系统。最后，制造了DSBW原型以证明其高安全可靠性。进行了系统的故障注入实验，其中DSBW在发生任何单个电气故障时都能正常工作。