Patent ID: 7584816
Filing Date: 2009-09-08
Classification: B62D

Abstract:
1. A system comprising: an electric motor for generating a steering force in response to a command value, and a controller for generating said command value to said electric motor, wherein said controller generates said command value in correspondence with steering state of wheels, and thereby controls torque or rotation number of said electric motor, and means for detecting said steering state of said wheels, and wherein, based on a detection result by said means for detecting said steering state, if the steering velocity of said wheels is larger than a predetermined value, said controller controls said command value so that a difference between a torque command value, which is said command value to said electric motor, and an actual torque of said electric motor will become smaller, and, if said steering velocity of said wheels is smaller than said predetermined value, said controller controls said command value so that a difference between a rotational velocity command value, which is said command value to said electric motor, and an actual rotational velocity of said electric motor will become smaller, and further comprising: a second electric motor for providing a steering reaction force to a steering shaft to which said power steering system is connected, and a rotation sensor provided on said second electric motor, wherein said means for detecting said steering state of said wheels detects said steering state based on output of said rotation sensor.