Power steering apparatus having failure detection device for rotation angle sensors

摘要

A power steering apparatus has a steering power assisting system (100) coupled to tire wheels (FW1, FW2) and a variable gear transfer system (200) coupled to a steering wheel (10). The steering power assisting system (100) includes a torsion bar rotation sensor (34) and a first actuator rotation sensor (62) to calculate a first pinion angle and a second pinion angle based on the detected rotation angles, respectively. The variable gear transfer system (200) includes a steering sensor (70) and a second actuator rotation sensor (72) to calculate a third pinion angle based on the detected rotation angles. Sensor failure is detected by comparing the calculated first, second and third pinion angles.