| 摘要 |
A power steering system (11) includes an EPS (12) and a HPS (13). At normal times, an assist force required by a steering system is computed based on a steering torque (Ä) and a vehicle speed (V), and the required assist force is generated by the EPS (12) and the HPS (13). The torsional stiffness of a torsion bar (54) of the HPS (13) is equal to or substantially equal to the torsional stiffness of a torsion bar (21a) of the EPS (12). Therefore, even if the EPS (12) malfunctions, it is possible to gain the steering feel similar to that when the EPS (12) is operating properly. |
