Steering device of vehicle

A steering device of a vehicle having a steering wheel to be operated by a driver in order to steer said vehicle and turning means for turning wheels to be turned, depending on the operation of said steering wheel, comprising:

• operation input value detection means for detecting an operation input value of said driver to said steering wheel;
• target turning amount calculation means for calculating a target turning amount of said wheels to be turned by using said operation input value detected by said operation input value detection means, said target turning amount having a predetermined relationship with said operation input value to said steering wheel;
• transfer function setting means for setting a second transfer function by using a first transfer function determined on the basis of the specification of said vehicle, said first transfer function having as an input a turning amount of said wheels to be turned and as an output a motion condition amount generated in said vehicle by the turning of said wheels to be turned, said second transfer function having as an input a target turning rate indicating a temporal change of said target turning amount calculated by said target turning amount calculation means and as an output a turning amount of said wheels to be turned which are turned at said target turning rate;
• correction turning amount calculation means for calculating a correction turning amount by using said second transfer function set by said transfer function setting means and said target turning rate, said correction turning amount correcting the change of the motion condition amount generated in said vehicle when said wheels to be turned are turned by said target turning amount calculated by said target turning amount calculation means;
• final target turning amount calculation means for calculating a final target turning amount by adding said correction turning amount calculated by said correction turning amount calculation means to said target turning amount calculated by said target turning amount calculation means;
• and
• turning control means for turning said wheels to be turned, depending on said final target turning amount calculated by said final target turning amount calculation means.