The invention discloses an ASIL-D grade EPS torque angle sensor based on a multi-pole magnetic ring structure, based on a Hall sensing principle, an input shaft and an output shaft of an electric power steering system EPS are respectively provided with a multi-pole magnetic ring with a certain period, the side surface of the magnetic ring is provided with a multipath output linear Hall chip, and the linear Hall chip is provided with a plurality of Hall sensors. And the detection module is used for detecting the rotation angles of the input and output shafts and calculating the angle difference of the two angles to obtain the relative rotation angle of the torsion bar. In addition, a large gear is installed on the output shaft to drive the two small gears containing the magnets to rotate, the rotating angles of the two small gears are measured through the two multi-output Hall chips, and therefore redundant steering wheel rotating angle signals are output. According to the invention, the ASIL-D level function safety requirement of the EPS torque angle sensor is finally realized. The torque and angle sensor architecture has flexible expandability and can meet the requirement for higher-level functional safety.
本发明公开了一种基于多极磁环结构的ASIL‑D等级EPS扭矩转角传感器,基于霍尔感应原理,在电动助力转向系统EPS的输入轴和输出轴上分别安装有一个具有一定周期的多极磁环,在磁环的侧面安装有多路输出的线性霍尔芯片,用于检测输入输出轴的转角,并计算出两个角度的角度差,得到扭力杆的相对转角。另外还通过在输出轴上安装一个大齿轮,带动两个含有磁铁的小齿轮转动,利用两个多路输出的霍尔芯片测量两个小齿轮的转角,从而输出冗余的方向盘转角信号。本发明最终实现EPS扭矩转角传感器ASIL‑D等级功能安全要求。本发明的扭矩转角传感器架构具有灵活的可扩展性,可以实现更高等级的功能安全需求。
ASIL-D grade EPS torque angle sensor based on multi-pole magnetic ring structure
一种基于多极磁环结构的ASIL-D等级EPS扭矩转角传感器
2023-02-03
Patent
Electronic Resource
Chinese
IPC: | B62D MOTOR VEHICLES , Motorfahrzeuge |
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