关键词: 商用车；电液复合转向系统；冗余设计；传感器；安全机制

Abstract: With the improvement of commercial vehicle autonomous driving level, the safety of the active steering function of the steering system is increasingly valued. The electric-hydraulic steering system is currently an ideal solution for the steering electrification and intelligence of medium and heavy commercial vehicle. This paper proposes a high safety electric-hydraulic steering system with an electrical redundancy architecture, and designs the most critical sensor safety mechanism from the perspective of functional safety. Precisely, redundancy verification and online monitoring of failure modes are carried out on the torque signal, and the absolute angle values converted by the steering wheel by the two angle acquisition modules and motor position sensors are analyzed for correctness verification and multiple fault tolerance judgments. Finally, the hardware-in-the-loop(HIL) test is carried out to verify the effectiveness of the designed sensor safety mechanism.

Key words: Commercial vehicle; Electric-hydraulic steering system; Redundant design; Sensor; Safety mechanism