ECHNICAL EPORTS Static SteeringControl （ECHNICAL EPORTS静态SteeringControl）.pdfVIP

T ECHNICAL R EPORTS Static Steering-Control System for Electric-Power Steering by Masahiko Kurishige and Takayuki Kifuku* [1] Electric-power steering (EPS) systems have at- perform frequency analysis to elucidate the os- tracted much attention for their advantages with cillation mechanism during static steering. As respect to improved fuel economy and have been shown in Eq. (1), this model can be represented widely adopted as automotive power-steering as a balance between the motor inertia, the equipment in recent years. The article intro- steering torque applied by the driver Thdl, the duces a new EPS control system that reduces assist torque produced by the motor TASSIST and steering torque during static steering (i.e., while the reaction torque of the steering mechanism a vehicle is at rest) as a means of further im- Ttran. During static steering, the area of contact proving EPS control performance. between the front tires and the road surface does not change in the region of small steering-wheel Required Control Performance During Static angles. Since the torsion of the tires acts as a Steering spring, the steering angle and reaction torque An