In a vehicle steering apparatus, front wheels are controlled to be turned
by a computer program processing. A displacement/torque conversion
section 51 converts a steering angle .theta. into a steering torque Td
that is in relation of exponential function. A
torque/lateral-acceleration conversion section 52, torque/yaw-rate
conversion section 53 and torque/curvature conversion section 54 convert
into an anticipated lateral acceleration Gd, anticipated yaw rate
.gamma.d and anticipated turning curvature .rho.d based upon the steering
torque Td. Turning angle conversion sections 55, 56 and 57 calculate
target turning angles .delta.g, .delta..gamma. and .delta..rho.. A
turning angle deciding section 58 decides a target turning angle .delta.d
among the target turning angles .delta.g, .delta..gamma. and .delta..rho.
according to the detected vehicle speed V. A turning control section 60
controls the steered wheels to be turned into the target turning angle
.delta.d. Herewith, the vehicle steering apparatus of the present
invention can turn the vehicle so as to be adapted to a man's perception
characteristic in all speed areas with respect to an operation on a
steering handle by a driver. Therefore, the driver can easily drive the
vehicle in all speed areas.